hlms.js

// The Module object: Our interface to the outside world. We import
// and export values on it. There are various ways Module can be used:
// 1. Not defined. We create it here
// 2. A function parameter, function(Module) { ..generated code.. }
// 3. pre-run appended it, var Module = {}; ..generated code..
// 4. External script tag defines var Module.
// We need to check if Module already exists (e.g. case 3 above).
// Substitution will be replaced with actual code on later stage of the build,
// this way Closure Compiler will not mangle it (e.g. case 4. above).
// Note that if you want to run closure, and also to use Module
// after the generated code, you will need to define   var Module = {};
// before the code. Then that object will be used in the code, and you
// can continue to use Module afterwards as well.
var Module = typeof Module !== 'undefined' ? Module : {};

// --pre-jses are emitted after the Module integration code, so that they can
// refer to Module (if they choose; they can also define Module)
// {{PRE_JSES}}

// Sometimes an existing Module object exists with properties
// meant to overwrite the default module functionality. Here
// we collect those properties and reapply _after_ we configure
// the current environment's defaults to avoid having to be so
// defensive during initialization.
var moduleOverrides = {};
var key;
for (key in Module) {
  if (Module.hasOwnProperty(key)) {
    moduleOverrides[key] = Module[key];
  }
}

var arguments_ = [];
var thisProgram = './this.program';
var quit_ = function(status, toThrow) {
  throw toThrow;
};

// Determine the runtime environment we are in. You can customize this by
// setting the ENVIRONMENT setting at compile time (see settings.js).

var ENVIRONMENT_IS_WEB = false;
var ENVIRONMENT_IS_WORKER = false;
var ENVIRONMENT_IS_NODE = false;
var ENVIRONMENT_IS_SHELL = false;
ENVIRONMENT_IS_WEB = typeof window === 'object';
ENVIRONMENT_IS_WORKER = typeof importScripts === 'function';
// N.b. Electron.js environment is simultaneously a NODE-environment, but
// also a web environment.
ENVIRONMENT_IS_NODE = typeof process === 'object' && typeof process.versions === 'object' && typeof process.versions.node === 'string';
ENVIRONMENT_IS_SHELL = !ENVIRONMENT_IS_WEB && !ENVIRONMENT_IS_NODE && !ENVIRONMENT_IS_WORKER;

if (Module['ENVIRONMENT']) {
  throw new Error('Module.ENVIRONMENT has been deprecated. To force the environment, use the ENVIRONMENT compile-time option (for example, -s ENVIRONMENT=web or -s ENVIRONMENT=node)');
}

// `/` should be present at the end if `scriptDirectory` is not empty
var scriptDirectory = '';
function locateFile(path) {
  if (Module['locateFile']) {
    return Module['locateFile'](path, scriptDirectory);
  }
  return scriptDirectory + path;
}

// Hooks that are implemented differently in different runtime environments.
var read_,
    readAsync,
    readBinary,
    setWindowTitle;

var nodeFS;
var nodePath;

if (ENVIRONMENT_IS_NODE) {
  if (ENVIRONMENT_IS_WORKER) {
    scriptDirectory = require('path').dirname(scriptDirectory) + '/';
  } else {
    scriptDirectory = __dirname + '/';
  }

// include: node_shell_read.js


read_ = function shell_read(filename, binary) {
  if (!nodeFS) nodeFS = require('fs');
  if (!nodePath) nodePath = require('path');
  filename = nodePath['normalize'](filename);
  return nodeFS['readFileSync'](filename, binary ? null : 'utf8');
};

readBinary = function readBinary(filename) {
  var ret = read_(filename, true);
  if (!ret.buffer) {
    ret = new Uint8Array(ret);
  }
  assert(ret.buffer);
  return ret;
};

// end include: node_shell_read.js
  if (process['argv'].length > 1) {
    thisProgram = process['argv'][1].replace(/\\/g, '/');
  }

  arguments_ = process['argv'].slice(2);

  if (typeof module !== 'undefined') {
    module['exports'] = Module;
  }

  process['on']('uncaughtException', function(ex) {
    // suppress ExitStatus exceptions from showing an error
    if (!(ex instanceof ExitStatus)) {
      throw ex;
    }
  });

  process['on']('unhandledRejection', abort);

  quit_ = function(status) {
    process['exit'](status);
  };

  Module['inspect'] = function () { return '[Emscripten Module object]'; };

} else
if (ENVIRONMENT_IS_SHELL) {

  if (typeof read != 'undefined') {
    read_ = function shell_read(f) {
      return read(f);
    };
  }

  readBinary = function readBinary(f) {
    var data;
    if (typeof readbuffer === 'function') {
      return new Uint8Array(readbuffer(f));
    }
    data = read(f, 'binary');
    assert(typeof data === 'object');
    return data;
  };

  if (typeof scriptArgs != 'undefined') {
    arguments_ = scriptArgs;
  } else if (typeof arguments != 'undefined') {
    arguments_ = arguments;
  }

  if (typeof quit === 'function') {
    quit_ = function(status) {
      quit(status);
    };
  }

  if (typeof print !== 'undefined') {
    // Prefer to use print/printErr where they exist, as they usually work better.
    if (typeof console === 'undefined') console = /** @type{!Console} */({});
    console.log = /** @type{!function(this:Console, ...*): undefined} */ (print);
    console.warn = console.error = /** @type{!function(this:Console, ...*): undefined} */ (typeof printErr !== 'undefined' ? printErr : print);
  }

} else

// Note that this includes Node.js workers when relevant (pthreads is enabled).
// Node.js workers are detected as a combination of ENVIRONMENT_IS_WORKER and
// ENVIRONMENT_IS_NODE.
if (ENVIRONMENT_IS_WEB || ENVIRONMENT_IS_WORKER) {
  if (ENVIRONMENT_IS_WORKER) { // Check worker, not web, since window could be polyfilled
    scriptDirectory = self.location.href;
  } else if (typeof document !== 'undefined' && document.currentScript) { // web
    scriptDirectory = document.currentScript.src;
  }
  // blob urls look like blob:http://site.com/etc/etc and we cannot infer anything from them.
  // otherwise, slice off the final part of the url to find the script directory.
  // if scriptDirectory does not contain a slash, lastIndexOf will return -1,
  // and scriptDirectory will correctly be replaced with an empty string.
  if (scriptDirectory.indexOf('blob:') !== 0) {
    scriptDirectory = scriptDirectory.substr(0, scriptDirectory.lastIndexOf('/')+1);
  } else {
    scriptDirectory = '';
  }

  // Differentiate the Web Worker from the Node Worker case, as reading must
  // be done differently.
  {

// include: web_or_worker_shell_read.js


  read_ = function(url) {
      var xhr = new XMLHttpRequest();
      xhr.open('GET', url, false);
      xhr.send(null);
      return xhr.responseText;
  };

  if (ENVIRONMENT_IS_WORKER) {
    readBinary = function(url) {
        var xhr = new XMLHttpRequest();
        xhr.open('GET', url, false);
        xhr.responseType = 'arraybuffer';
        xhr.send(null);
        return new Uint8Array(/** @type{!ArrayBuffer} */(xhr.response));
    };
  }

  readAsync = function(url, onload, onerror) {
    var xhr = new XMLHttpRequest();
    xhr.open('GET', url, true);
    xhr.responseType = 'arraybuffer';
    xhr.onload = function() {
      if (xhr.status == 200 || (xhr.status == 0 && xhr.response)) { // file URLs can return 0
        onload(xhr.response);
        return;
      }
      onerror();
    };
    xhr.onerror = onerror;
    xhr.send(null);
  };

// end include: web_or_worker_shell_read.js
  }

  setWindowTitle = function(title) { document.title = title };
} else
{
  throw new Error('environment detection error');
}

// Set up the out() and err() hooks, which are how we can print to stdout or
// stderr, respectively.
var out = Module['print'] || console.log.bind(console);
var err = Module['printErr'] || console.warn.bind(console);

// Merge back in the overrides
for (key in moduleOverrides) {
  if (moduleOverrides.hasOwnProperty(key)) {
    Module[key] = moduleOverrides[key];
  }
}
// Free the object hierarchy contained in the overrides, this lets the GC
// reclaim data used e.g. in memoryInitializerRequest, which is a large typed array.
moduleOverrides = null;

// Emit code to handle expected values on the Module object. This applies Module.x
// to the proper local x. This has two benefits: first, we only emit it if it is
// expected to arrive, and second, by using a local everywhere else that can be
// minified.

if (Module['arguments']) arguments_ = Module['arguments'];
if (!Object.getOwnPropertyDescriptor(Module, 'arguments')) {
  Object.defineProperty(Module, 'arguments', {
    configurable: true,
    get: function() {
      abort('Module.arguments has been replaced with plain arguments_ (the initial value can be provided on Module, but after startup the value is only looked for on a local variable of that name)')
    }
  });
}

if (Module['thisProgram']) thisProgram = Module['thisProgram'];
if (!Object.getOwnPropertyDescriptor(Module, 'thisProgram')) {
  Object.defineProperty(Module, 'thisProgram', {
    configurable: true,
    get: function() {
      abort('Module.thisProgram has been replaced with plain thisProgram (the initial value can be provided on Module, but after startup the value is only looked for on a local variable of that name)')
    }
  });
}

if (Module['quit']) quit_ = Module['quit'];
if (!Object.getOwnPropertyDescriptor(Module, 'quit')) {
  Object.defineProperty(Module, 'quit', {
    configurable: true,
    get: function() {
      abort('Module.quit has been replaced with plain quit_ (the initial value can be provided on Module, but after startup the value is only looked for on a local variable of that name)')
    }
  });
}

// perform assertions in shell.js after we set up out() and err(), as otherwise if an assertion fails it cannot print the message
// Assertions on removed incoming Module JS APIs.
assert(typeof Module['memoryInitializerPrefixURL'] === 'undefined', 'Module.memoryInitializerPrefixURL option was removed, use Module.locateFile instead');
assert(typeof Module['pthreadMainPrefixURL'] === 'undefined', 'Module.pthreadMainPrefixURL option was removed, use Module.locateFile instead');
assert(typeof Module['cdInitializerPrefixURL'] === 'undefined', 'Module.cdInitializerPrefixURL option was removed, use Module.locateFile instead');
assert(typeof Module['filePackagePrefixURL'] === 'undefined', 'Module.filePackagePrefixURL option was removed, use Module.locateFile instead');
assert(typeof Module['read'] === 'undefined', 'Module.read option was removed (modify read_ in JS)');
assert(typeof Module['readAsync'] === 'undefined', 'Module.readAsync option was removed (modify readAsync in JS)');
assert(typeof Module['readBinary'] === 'undefined', 'Module.readBinary option was removed (modify readBinary in JS)');
assert(typeof Module['setWindowTitle'] === 'undefined', 'Module.setWindowTitle option was removed (modify setWindowTitle in JS)');
assert(typeof Module['TOTAL_MEMORY'] === 'undefined', 'Module.TOTAL_MEMORY has been renamed Module.INITIAL_MEMORY');

if (!Object.getOwnPropertyDescriptor(Module, 'read')) {
  Object.defineProperty(Module, 'read', {
    configurable: true,
    get: function() {
      abort('Module.read has been replaced with plain read_ (the initial value can be provided on Module, but after startup the value is only looked for on a local variable of that name)')
    }
  });
}

if (!Object.getOwnPropertyDescriptor(Module, 'readAsync')) {
  Object.defineProperty(Module, 'readAsync', {
    configurable: true,
    get: function() {
      abort('Module.readAsync has been replaced with plain readAsync (the initial value can be provided on Module, but after startup the value is only looked for on a local variable of that name)')
    }
  });
}

if (!Object.getOwnPropertyDescriptor(Module, 'readBinary')) {
  Object.defineProperty(Module, 'readBinary', {
    configurable: true,
    get: function() {
      abort('Module.readBinary has been replaced with plain readBinary (the initial value can be provided on Module, but after startup the value is only looked for on a local variable of that name)')
    }
  });
}

if (!Object.getOwnPropertyDescriptor(Module, 'setWindowTitle')) {
  Object.defineProperty(Module, 'setWindowTitle', {
    configurable: true,
    get: function() {
      abort('Module.setWindowTitle has been replaced with plain setWindowTitle (the initial value can be provided on Module, but after startup the value is only looked for on a local variable of that name)')
    }
  });
}
var IDBFS = 'IDBFS is no longer included by default; build with -lidbfs.js';
var PROXYFS = 'PROXYFS is no longer included by default; build with -lproxyfs.js';
var WORKERFS = 'WORKERFS is no longer included by default; build with -lworkerfs.js';
var NODEFS = 'NODEFS is no longer included by default; build with -lnodefs.js';




var STACK_ALIGN = 16;

function alignMemory(size, factor) {
  if (!factor) factor = STACK_ALIGN; // stack alignment (16-byte) by default
  return Math.ceil(size / factor) * factor;
}

function getNativeTypeSize(type) {
  switch (type) {
    case 'i1': case 'i8': return 1;
    case 'i16': return 2;
    case 'i32': return 4;
    case 'i64': return 8;
    case 'float': return 4;
    case 'double': return 8;
    default: {
      if (type[type.length-1] === '*') {
        return 4; // A pointer
      } else if (type[0] === 'i') {
        var bits = Number(type.substr(1));
        assert(bits % 8 === 0, 'getNativeTypeSize invalid bits ' + bits + ', type ' + type);
        return bits / 8;
      } else {
        return 0;
      }
    }
  }
}

function warnOnce(text) {
  if (!warnOnce.shown) warnOnce.shown = {};
  if (!warnOnce.shown[text]) {
    warnOnce.shown[text] = 1;
    err(text);
  }
}

// include: runtime_functions.js


// Wraps a JS function as a wasm function with a given signature.
function convertJsFunctionToWasm(func, sig) {

  // If the type reflection proposal is available, use the new
  // "WebAssembly.Function" constructor.
  // Otherwise, construct a minimal wasm module importing the JS function and
  // re-exporting it.
  if (typeof WebAssembly.Function === "function") {
    var typeNames = {
      'i': 'i32',
      'j': 'i64',
      'f': 'f32',
      'd': 'f64'
    };
    var type = {
      parameters: [],
      results: sig[0] == 'v' ? [] : [typeNames[sig[0]]]
    };
    for (var i = 1; i < sig.length; ++i) {
      type.parameters.push(typeNames[sig[i]]);
    }
    return new WebAssembly.Function(type, func);
  }

  // The module is static, with the exception of the type section, which is
  // generated based on the signature passed in.
  var typeSection = [
    0x01, // id: section,
    0x00, // length: 0 (placeholder)
    0x01, // count: 1
    0x60, // form: func
  ];
  var sigRet = sig.slice(0, 1);
  var sigParam = sig.slice(1);
  var typeCodes = {
    'i': 0x7f, // i32
    'j': 0x7e, // i64
    'f': 0x7d, // f32
    'd': 0x7c, // f64
  };

  // Parameters, length + signatures
  typeSection.push(sigParam.length);
  for (var i = 0; i < sigParam.length; ++i) {
    typeSection.push(typeCodes[sigParam[i]]);
  }

  // Return values, length + signatures
  // With no multi-return in MVP, either 0 (void) or 1 (anything else)
  if (sigRet == 'v') {
    typeSection.push(0x00);
  } else {
    typeSection = typeSection.concat([0x01, typeCodes[sigRet]]);
  }

  // Write the overall length of the type section back into the section header
  // (excepting the 2 bytes for the section id and length)
  typeSection[1] = typeSection.length - 2;

  // Rest of the module is static
  var bytes = new Uint8Array([
    0x00, 0x61, 0x73, 0x6d, // magic ("\0asm")
    0x01, 0x00, 0x00, 0x00, // version: 1
  ].concat(typeSection, [
    0x02, 0x07, // import section
      // (import "e" "f" (func 0 (type 0)))
      0x01, 0x01, 0x65, 0x01, 0x66, 0x00, 0x00,
    0x07, 0x05, // export section
      // (export "f" (func 0 (type 0)))
      0x01, 0x01, 0x66, 0x00, 0x00,
  ]));

   // We can compile this wasm module synchronously because it is very small.
  // This accepts an import (at "e.f"), that it reroutes to an export (at "f")
  var module = new WebAssembly.Module(bytes);
  var instance = new WebAssembly.Instance(module, {
    'e': {
      'f': func
    }
  });
  var wrappedFunc = instance.exports['f'];
  return wrappedFunc;
}

var freeTableIndexes = [];

// Weak map of functions in the table to their indexes, created on first use.
var functionsInTableMap;

function getEmptyTableSlot() {
  // Reuse a free index if there is one, otherwise grow.
  if (freeTableIndexes.length) {
    return freeTableIndexes.pop();
  }
  // Grow the table
  try {
    wasmTable.grow(1);
  } catch (err) {
    if (!(err instanceof RangeError)) {
      throw err;
    }
    throw 'Unable to grow wasm table. Set ALLOW_TABLE_GROWTH.';
  }
  return wasmTable.length - 1;
}

// Add a wasm function to the table.
function addFunctionWasm(func, sig) {
  // Check if the function is already in the table, to ensure each function
  // gets a unique index. First, create the map if this is the first use.
  if (!functionsInTableMap) {
    functionsInTableMap = new WeakMap();
    for (var i = 0; i < wasmTable.length; i++) {
      var item = wasmTable.get(i);
      // Ignore null values.
      if (item) {
        functionsInTableMap.set(item, i);
      }
    }
  }
  if (functionsInTableMap.has(func)) {
    return functionsInTableMap.get(func);
  }

  // It's not in the table, add it now.

  var ret = getEmptyTableSlot();

  // Set the new value.
  try {
    // Attempting to call this with JS function will cause of table.set() to fail
    wasmTable.set(ret, func);
  } catch (err) {
    if (!(err instanceof TypeError)) {
      throw err;
    }
    assert(typeof sig !== 'undefined', 'Missing signature argument to addFunction: ' + func);
    var wrapped = convertJsFunctionToWasm(func, sig);
    wasmTable.set(ret, wrapped);
  }

  functionsInTableMap.set(func, ret);

  return ret;
}

function removeFunction(index) {
  functionsInTableMap.delete(wasmTable.get(index));
  freeTableIndexes.push(index);
}

// 'sig' parameter is required for the llvm backend but only when func is not
// already a WebAssembly function.
function addFunction(func, sig) {
  assert(typeof func !== 'undefined');

  return addFunctionWasm(func, sig);
}

// end include: runtime_functions.js
// include: runtime_debug.js


// end include: runtime_debug.js
var tempRet0 = 0;

var setTempRet0 = function(value) {
  tempRet0 = value;
};

var getTempRet0 = function() {
  return tempRet0;
};



// === Preamble library stuff ===

// Documentation for the public APIs defined in this file must be updated in:
//    site/source/docs/api_reference/preamble.js.rst
// A prebuilt local version of the documentation is available at:
//    site/build/text/docs/api_reference/preamble.js.txt
// You can also build docs locally as HTML or other formats in site/
// An online HTML version (which may be of a different version of Emscripten)
//    is up at http://kripken.github.io/emscripten-site/docs/api_reference/preamble.js.html

var wasmBinary;
if (Module['wasmBinary']) wasmBinary = Module['wasmBinary'];
if (!Object.getOwnPropertyDescriptor(Module, 'wasmBinary')) {
  Object.defineProperty(Module, 'wasmBinary', {
    configurable: true,
    get: function() {
      abort('Module.wasmBinary has been replaced with plain wasmBinary (the initial value can be provided on Module, but after startup the value is only looked for on a local variable of that name)')
    }
  });
}
var noExitRuntime = Module['noExitRuntime'] || true;
if (!Object.getOwnPropertyDescriptor(Module, 'noExitRuntime')) {
  Object.defineProperty(Module, 'noExitRuntime', {
    configurable: true,
    get: function() {
      abort('Module.noExitRuntime has been replaced with plain noExitRuntime (the initial value can be provided on Module, but after startup the value is only looked for on a local variable of that name)')
    }
  });
}

if (typeof WebAssembly !== 'object') {
  abort('no native wasm support detected');
}

// include: runtime_safe_heap.js


// In MINIMAL_RUNTIME, setValue() and getValue() are only available when building with safe heap enabled, for heap safety checking.
// In traditional runtime, setValue() and getValue() are always available (although their use is highly discouraged due to perf penalties)

/** @param {number} ptr
    @param {number} value
    @param {string} type
    @param {number|boolean=} noSafe */
function setValue(ptr, value, type, noSafe) {
  type = type || 'i8';
  if (type.charAt(type.length-1) === '*') type = 'i32'; // pointers are 32-bit
    switch (type) {
      case 'i1': HEAP8[((ptr)>>0)] = value; break;
      case 'i8': HEAP8[((ptr)>>0)] = value; break;
      case 'i16': HEAP16[((ptr)>>1)] = value; break;
      case 'i32': HEAP32[((ptr)>>2)] = value; break;
      case 'i64': (tempI64 = [value>>>0,(tempDouble=value,(+(Math.abs(tempDouble))) >= 1.0 ? (tempDouble > 0.0 ? ((Math.min((+(Math.floor((tempDouble)/4294967296.0))), 4294967295.0))|0)>>>0 : (~~((+(Math.ceil((tempDouble - +(((~~(tempDouble)))>>>0))/4294967296.0)))))>>>0) : 0)],HEAP32[((ptr)>>2)] = tempI64[0],HEAP32[(((ptr)+(4))>>2)] = tempI64[1]); break;
      case 'float': HEAPF32[((ptr)>>2)] = value; break;
      case 'double': HEAPF64[((ptr)>>3)] = value; break;
      default: abort('invalid type for setValue: ' + type);
    }
}

/** @param {number} ptr
    @param {string} type
    @param {number|boolean=} noSafe */
function getValue(ptr, type, noSafe) {
  type = type || 'i8';
  if (type.charAt(type.length-1) === '*') type = 'i32'; // pointers are 32-bit
    switch (type) {
      case 'i1': return HEAP8[((ptr)>>0)];
      case 'i8': return HEAP8[((ptr)>>0)];
      case 'i16': return HEAP16[((ptr)>>1)];
      case 'i32': return HEAP32[((ptr)>>2)];
      case 'i64': return HEAP32[((ptr)>>2)];
      case 'float': return HEAPF32[((ptr)>>2)];
      case 'double': return HEAPF64[((ptr)>>3)];
      default: abort('invalid type for getValue: ' + type);
    }
  return null;
}

// end include: runtime_safe_heap.js
// Wasm globals

var wasmMemory;

//========================================
// Runtime essentials
//========================================

// whether we are quitting the application. no code should run after this.
// set in exit() and abort()
var ABORT = false;

// set by exit() and abort().  Passed to 'onExit' handler.
// NOTE: This is also used as the process return code code in shell environments
// but only when noExitRuntime is false.
var EXITSTATUS;

/** @type {function(*, string=)} */
function assert(condition, text) {
  if (!condition) {
    abort('Assertion failed: ' + text);
  }
}

// Returns the C function with a specified identifier (for C++, you need to do manual name mangling)
function getCFunc(ident) {
  var func = Module['_' + ident]; // closure exported function
  assert(func, 'Cannot call unknown function ' + ident + ', make sure it is exported');
  return func;
}

// C calling interface.
/** @param {string|null=} returnType
    @param {Array=} argTypes
    @param {Arguments|Array=} args
    @param {Object=} opts */
function ccall(ident, returnType, argTypes, args, opts) {
  // For fast lookup of conversion functions
  var toC = {
    'string': function(str) {
      var ret = 0;
      if (str !== null && str !== undefined && str !== 0) { // null string
        // at most 4 bytes per UTF-8 code point, +1 for the trailing '\0'
        var len = (str.length << 2) + 1;
        ret = stackAlloc(len);
        stringToUTF8(str, ret, len);
      }
      return ret;
    },
    'array': function(arr) {
      var ret = stackAlloc(arr.length);
      writeArrayToMemory(arr, ret);
      return ret;
    }
  };

  function convertReturnValue(ret) {
    if (returnType === 'string') return UTF8ToString(ret);
    if (returnType === 'boolean') return Boolean(ret);
    return ret;
  }

  var func = getCFunc(ident);
  var cArgs = [];
  var stack = 0;
  assert(returnType !== 'array', 'Return type should not be "array".');
  if (args) {
    for (var i = 0; i < args.length; i++) {
      var converter = toC[argTypes[i]];
      if (converter) {
        if (stack === 0) stack = stackSave();
        cArgs[i] = converter(args[i]);
      } else {
        cArgs[i] = args[i];
      }
    }
  }
  var ret = func.apply(null, cArgs);
  var asyncMode = opts && opts.async;
  var runningAsync = typeof Asyncify === 'object' && Asyncify.currData;
  var prevRunningAsync = typeof Asyncify === 'object' && Asyncify.asyncFinalizers.length > 0;
  assert(!asyncMode || !prevRunningAsync, 'Cannot have multiple async ccalls in flight at once');
  // Check if we started an async operation just now.
  if (runningAsync && !prevRunningAsync) {
    // If so, the WASM function ran asynchronous and unwound its stack.
    // We need to return a Promise that resolves the return value
    // once the stack is rewound and execution finishes.
    assert(asyncMode, 'The call to ' + ident + ' is running asynchronously. If this was intended, add the async option to the ccall/cwrap call.');
    return new Promise(function(resolve) {
      Asyncify.asyncFinalizers.push(function(ret) {
        if (stack !== 0) stackRestore(stack);
        resolve(convertReturnValue(ret));
      });
    });
  }

  ret = convertReturnValue(ret);
  if (stack !== 0) stackRestore(stack);
  // If this is an async ccall, ensure we return a promise
  if (opts && opts.async) return Promise.resolve(ret);
  return ret;
}

/** @param {string=} returnType
    @param {Array=} argTypes
    @param {Object=} opts */
function cwrap(ident, returnType, argTypes, opts) {
  return function() {
    return ccall(ident, returnType, argTypes, arguments, opts);
  }
}

// We used to include malloc/free by default in the past. Show a helpful error in
// builds with assertions.

var ALLOC_NORMAL = 0; // Tries to use _malloc()
var ALLOC_STACK = 1; // Lives for the duration of the current function call

// allocate(): This is for internal use. You can use it yourself as well, but the interface
//             is a little tricky (see docs right below). The reason is that it is optimized
//             for multiple syntaxes to save space in generated code. So you should
//             normally not use allocate(), and instead allocate memory using _malloc(),
//             initialize it with setValue(), and so forth.
// @slab: An array of data.
// @allocator: How to allocate memory, see ALLOC_*
/** @type {function((Uint8Array|Array<number>), number)} */
function allocate(slab, allocator) {
  var ret;
  assert(typeof allocator === 'number', 'allocate no longer takes a type argument')
  assert(typeof slab !== 'number', 'allocate no longer takes a number as arg0')

  if (allocator == ALLOC_STACK) {
    ret = stackAlloc(slab.length);
  } else {
    ret = _malloc(slab.length);
  }

  if (slab.subarray || slab.slice) {
    HEAPU8.set(/** @type {!Uint8Array} */(slab), ret);
  } else {
    HEAPU8.set(new Uint8Array(slab), ret);
  }
  return ret;
}

// include: runtime_strings.js


// runtime_strings.js: Strings related runtime functions that are part of both MINIMAL_RUNTIME and regular runtime.

// Given a pointer 'ptr' to a null-terminated UTF8-encoded string in the given array that contains uint8 values, returns
// a copy of that string as a Javascript String object.

var UTF8Decoder = typeof TextDecoder !== 'undefined' ? new TextDecoder('utf8') : undefined;

/**
 * @param {number} idx
 * @param {number=} maxBytesToRead
 * @return {string}
 */
function UTF8ArrayToString(heap, idx, maxBytesToRead) {
  var endIdx = idx + maxBytesToRead;
  var endPtr = idx;
  // TextDecoder needs to know the byte length in advance, it doesn't stop on null terminator by itself.
  // Also, use the length info to avoid running tiny strings through TextDecoder, since .subarray() allocates garbage.
  // (As a tiny code save trick, compare endPtr against endIdx using a negation, so that undefined means Infinity)
  while (heap[endPtr] && !(endPtr >= endIdx)) ++endPtr;

  if (endPtr - idx > 16 && heap.subarray && UTF8Decoder) {
    return UTF8Decoder.decode(heap.subarray(idx, endPtr));
  } else {
    var str = '';
    // If building with TextDecoder, we have already computed the string length above, so test loop end condition against that
    while (idx < endPtr) {
      // For UTF8 byte structure, see:
      // http://en.wikipedia.org/wiki/UTF-8#Description
      // https://www.ietf.org/rfc/rfc2279.txt
      // https://tools.ietf.org/html/rfc3629
      var u0 = heap[idx++];
      if (!(u0 & 0x80)) { str += String.fromCharCode(u0); continue; }
      var u1 = heap[idx++] & 63;
      if ((u0 & 0xE0) == 0xC0) { str += String.fromCharCode(((u0 & 31) << 6) | u1); continue; }
      var u2 = heap[idx++] & 63;
      if ((u0 & 0xF0) == 0xE0) {
        u0 = ((u0 & 15) << 12) | (u1 << 6) | u2;
      } else {
        if ((u0 & 0xF8) != 0xF0) warnOnce('Invalid UTF-8 leading byte 0x' + u0.toString(16) + ' encountered when deserializing a UTF-8 string in wasm memory to a JS string!');
        u0 = ((u0 & 7) << 18) | (u1 << 12) | (u2 << 6) | (heap[idx++] & 63);
      }

      if (u0 < 0x10000) {
        str += String.fromCharCode(u0);
      } else {
        var ch = u0 - 0x10000;
        str += String.fromCharCode(0xD800 | (ch >> 10), 0xDC00 | (ch & 0x3FF));
      }
    }
  }
  return str;
}

// Given a pointer 'ptr' to a null-terminated UTF8-encoded string in the emscripten HEAP, returns a
// copy of that string as a Javascript String object.
// maxBytesToRead: an optional length that specifies the maximum number of bytes to read. You can omit
//                 this parameter to scan the string until the first \0 byte. If maxBytesToRead is
//                 passed, and the string at [ptr, ptr+maxBytesToReadr[ contains a null byte in the
//                 middle, then the string will cut short at that byte index (i.e. maxBytesToRead will
//                 not produce a string of exact length [ptr, ptr+maxBytesToRead[)
//                 N.B. mixing frequent uses of UTF8ToString() with and without maxBytesToRead may
//                 throw JS JIT optimizations off, so it is worth to consider consistently using one
//                 style or the other.
/**
 * @param {number} ptr
 * @param {number=} maxBytesToRead
 * @return {string}
 */
function UTF8ToString(ptr, maxBytesToRead) {
  return ptr ? UTF8ArrayToString(HEAPU8, ptr, maxBytesToRead) : '';
}

// Copies the given Javascript String object 'str' to the given byte array at address 'outIdx',
// encoded in UTF8 form and null-terminated. The copy will require at most str.length*4+1 bytes of space in the HEAP.
// Use the function lengthBytesUTF8 to compute the exact number of bytes (excluding null terminator) that this function will write.
// Parameters:
//   str: the Javascript string to copy.
//   heap: the array to copy to. Each index in this array is assumed to be one 8-byte element.
//   outIdx: The starting offset in the array to begin the copying.
//   maxBytesToWrite: The maximum number of bytes this function can write to the array.
//                    This count should include the null terminator,
//                    i.e. if maxBytesToWrite=1, only the null terminator will be written and nothing else.
//                    maxBytesToWrite=0 does not write any bytes to the output, not even the null terminator.
// Returns the number of bytes written, EXCLUDING the null terminator.

function stringToUTF8Array(str, heap, outIdx, maxBytesToWrite) {
  if (!(maxBytesToWrite > 0)) // Parameter maxBytesToWrite is not optional. Negative values, 0, null, undefined and false each don't write out any bytes.
    return 0;

  var startIdx = outIdx;
  var endIdx = outIdx + maxBytesToWrite - 1; // -1 for string null terminator.
  for (var i = 0; i < str.length; ++i) {
    // Gotcha: charCodeAt returns a 16-bit word that is a UTF-16 encoded code unit, not a Unicode code point of the character! So decode UTF16->UTF32->UTF8.
    // See http://unicode.org/faq/utf_bom.html#utf16-3
    // For UTF8 byte structure, see http://en.wikipedia.org/wiki/UTF-8#Description and https://www.ietf.org/rfc/rfc2279.txt and https://tools.ietf.org/html/rfc3629
    var u = str.charCodeAt(i); // possibly a lead surrogate
    if (u >= 0xD800 && u <= 0xDFFF) {
      var u1 = str.charCodeAt(++i);
      u = 0x10000 + ((u & 0x3FF) << 10) | (u1 & 0x3FF);
    }
    if (u <= 0x7F) {
      if (outIdx >= endIdx) break;
      heap[outIdx++] = u;
    } else if (u <= 0x7FF) {
      if (outIdx + 1 >= endIdx) break;
      heap[outIdx++] = 0xC0 | (u >> 6);
      heap[outIdx++] = 0x80 | (u & 63);
    } else if (u <= 0xFFFF) {
      if (outIdx + 2 >= endIdx) break;
      heap[outIdx++] = 0xE0 | (u >> 12);
      heap[outIdx++] = 0x80 | ((u >> 6) & 63);
      heap[outIdx++] = 0x80 | (u & 63);
    } else {
      if (outIdx + 3 >= endIdx) break;
      if (u >= 0x200000) warnOnce('Invalid Unicode code point 0x' + u.toString(16) + ' encountered when serializing a JS string to a UTF-8 string in wasm memory! (Valid unicode code points should be in range 0-0x1FFFFF).');
      heap[outIdx++] = 0xF0 | (u >> 18);
      heap[outIdx++] = 0x80 | ((u >> 12) & 63);
      heap[outIdx++] = 0x80 | ((u >> 6) & 63);
      heap[outIdx++] = 0x80 | (u & 63);
    }
  }
  // Null-terminate the pointer to the buffer.
  heap[outIdx] = 0;
  return outIdx - startIdx;
}

// Copies the given Javascript String object 'str' to the emscripten HEAP at address 'outPtr',
// null-terminated and encoded in UTF8 form. The copy will require at most str.length*4+1 bytes of space in the HEAP.
// Use the function lengthBytesUTF8 to compute the exact number of bytes (excluding null terminator) that this function will write.
// Returns the number of bytes written, EXCLUDING the null terminator.

function stringToUTF8(str, outPtr, maxBytesToWrite) {
  assert(typeof maxBytesToWrite == 'number', 'stringToUTF8(str, outPtr, maxBytesToWrite) is missing the third parameter that specifies the length of the output buffer!');
  return stringToUTF8Array(str, HEAPU8,outPtr, maxBytesToWrite);
}

// Returns the number of bytes the given Javascript string takes if encoded as a UTF8 byte array, EXCLUDING the null terminator byte.
function lengthBytesUTF8(str) {
  var len = 0;
  for (var i = 0; i < str.length; ++i) {
    // Gotcha: charCodeAt returns a 16-bit word that is a UTF-16 encoded code unit, not a Unicode code point of the character! So decode UTF16->UTF32->UTF8.
    // See http://unicode.org/faq/utf_bom.html#utf16-3
    var u = str.charCodeAt(i); // possibly a lead surrogate
    if (u >= 0xD800 && u <= 0xDFFF) u = 0x10000 + ((u & 0x3FF) << 10) | (str.charCodeAt(++i) & 0x3FF);
    if (u <= 0x7F) ++len;
    else if (u <= 0x7FF) len += 2;
    else if (u <= 0xFFFF) len += 3;
    else len += 4;
  }
  return len;
}

// end include: runtime_strings.js
// include: runtime_strings_extra.js


// runtime_strings_extra.js: Strings related runtime functions that are available only in regular runtime.

// Given a pointer 'ptr' to a null-terminated ASCII-encoded string in the emscripten HEAP, returns
// a copy of that string as a Javascript String object.

function AsciiToString(ptr) {
  var str = '';
  while (1) {
    var ch = HEAPU8[((ptr++)>>0)];
    if (!ch) return str;
    str += String.fromCharCode(ch);
  }
}

// Copies the given Javascript String object 'str' to the emscripten HEAP at address 'outPtr',
// null-terminated and encoded in ASCII form. The copy will require at most str.length+1 bytes of space in the HEAP.

function stringToAscii(str, outPtr) {
  return writeAsciiToMemory(str, outPtr, false);
}

// Given a pointer 'ptr' to a null-terminated UTF16LE-encoded string in the emscripten HEAP, returns
// a copy of that string as a Javascript String object.

var UTF16Decoder = typeof TextDecoder !== 'undefined' ? new TextDecoder('utf-16le') : undefined;

function UTF16ToString(ptr, maxBytesToRead) {
  assert(ptr % 2 == 0, 'Pointer passed to UTF16ToString must be aligned to two bytes!');
  var endPtr = ptr;
  // TextDecoder needs to know the byte length in advance, it doesn't stop on null terminator by itself.
  // Also, use the length info to avoid running tiny strings through TextDecoder, since .subarray() allocates garbage.
  var idx = endPtr >> 1;
  var maxIdx = idx + maxBytesToRead / 2;
  // If maxBytesToRead is not passed explicitly, it will be undefined, and this
  // will always evaluate to true. This saves on code size.
  while (!(idx >= maxIdx) && HEAPU16[idx]) ++idx;
  endPtr = idx << 1;

  if (endPtr - ptr > 32 && UTF16Decoder) {
    return UTF16Decoder.decode(HEAPU8.subarray(ptr, endPtr));
  } else {
    var str = '';

    // If maxBytesToRead is not passed explicitly, it will be undefined, and the for-loop's condition
    // will always evaluate to true. The loop is then terminated on the first null char.
    for (var i = 0; !(i >= maxBytesToRead / 2); ++i) {
      var codeUnit = HEAP16[(((ptr)+(i*2))>>1)];
      if (codeUnit == 0) break;
      // fromCharCode constructs a character from a UTF-16 code unit, so we can pass the UTF16 string right through.
      str += String.fromCharCode(codeUnit);
    }

    return str;
  }
}

// Copies the given Javascript String object 'str' to the emscripten HEAP at address 'outPtr',
// null-terminated and encoded in UTF16 form. The copy will require at most str.length*4+2 bytes of space in the HEAP.
// Use the function lengthBytesUTF16() to compute the exact number of bytes (excluding null terminator) that this function will write.
// Parameters:
//   str: the Javascript string to copy.
//   outPtr: Byte address in Emscripten HEAP where to write the string to.
//   maxBytesToWrite: The maximum number of bytes this function can write to the array. This count should include the null
//                    terminator, i.e. if maxBytesToWrite=2, only the null terminator will be written and nothing else.
//                    maxBytesToWrite<2 does not write any bytes to the output, not even the null terminator.
// Returns the number of bytes written, EXCLUDING the null terminator.

function stringToUTF16(str, outPtr, maxBytesToWrite) {
  assert(outPtr % 2 == 0, 'Pointer passed to stringToUTF16 must be aligned to two bytes!');
  assert(typeof maxBytesToWrite == 'number', 'stringToUTF16(str, outPtr, maxBytesToWrite) is missing the third parameter that specifies the length of the output buffer!');
  // Backwards compatibility: if max bytes is not specified, assume unsafe unbounded write is allowed.
  if (maxBytesToWrite === undefined) {
    maxBytesToWrite = 0x7FFFFFFF;
  }
  if (maxBytesToWrite < 2) return 0;
  maxBytesToWrite -= 2; // Null terminator.
  var startPtr = outPtr;
  var numCharsToWrite = (maxBytesToWrite < str.length*2) ? (maxBytesToWrite / 2) : str.length;
  for (var i = 0; i < numCharsToWrite; ++i) {
    // charCodeAt returns a UTF-16 encoded code unit, so it can be directly written to the HEAP.
    var codeUnit = str.charCodeAt(i); // possibly a lead surrogate
    HEAP16[((outPtr)>>1)] = codeUnit;
    outPtr += 2;
  }
  // Null-terminate the pointer to the HEAP.
  HEAP16[((outPtr)>>1)] = 0;
  return outPtr - startPtr;
}

// Returns the number of bytes the given Javascript string takes if encoded as a UTF16 byte array, EXCLUDING the null terminator byte.

function lengthBytesUTF16(str) {
  return str.length*2;
}

function UTF32ToString(ptr, maxBytesToRead) {
  assert(ptr % 4 == 0, 'Pointer passed to UTF32ToString must be aligned to four bytes!');
  var i = 0;

  var str = '';
  // If maxBytesToRead is not passed explicitly, it will be undefined, and this
  // will always evaluate to true. This saves on code size.
  while (!(i >= maxBytesToRead / 4)) {
    var utf32 = HEAP32[(((ptr)+(i*4))>>2)];
    if (utf32 == 0) break;
    ++i;
    // Gotcha: fromCharCode constructs a character from a UTF-16 encoded code (pair), not from a Unicode code point! So encode the code point to UTF-16 for constructing.
    // See http://unicode.org/faq/utf_bom.html#utf16-3
    if (utf32 >= 0x10000) {
      var ch = utf32 - 0x10000;
      str += String.fromCharCode(0xD800 | (ch >> 10), 0xDC00 | (ch & 0x3FF));
    } else {
      str += String.fromCharCode(utf32);
    }
  }
  return str;
}

// Copies the given Javascript String object 'str' to the emscripten HEAP at address 'outPtr',
// null-terminated and encoded in UTF32 form. The copy will require at most str.length*4+4 bytes of space in the HEAP.
// Use the function lengthBytesUTF32() to compute the exact number of bytes (excluding null terminator) that this function will write.
// Parameters:
//   str: the Javascript string to copy.
//   outPtr: Byte address in Emscripten HEAP where to write the string to.
//   maxBytesToWrite: The maximum number of bytes this function can write to the array. This count should include the null
//                    terminator, i.e. if maxBytesToWrite=4, only the null terminator will be written and nothing else.
//                    maxBytesToWrite<4 does not write any bytes to the output, not even the null terminator.
// Returns the number of bytes written, EXCLUDING the null terminator.

function stringToUTF32(str, outPtr, maxBytesToWrite) {
  assert(outPtr % 4 == 0, 'Pointer passed to stringToUTF32 must be aligned to four bytes!');
  assert(typeof maxBytesToWrite == 'number', 'stringToUTF32(str, outPtr, maxBytesToWrite) is missing the third parameter that specifies the length of the output buffer!');
  // Backwards compatibility: if max bytes is not specified, assume unsafe unbounded write is allowed.
  if (maxBytesToWrite === undefined) {
    maxBytesToWrite = 0x7FFFFFFF;
  }
  if (maxBytesToWrite < 4) return 0;
  var startPtr = outPtr;
  var endPtr = startPtr + maxBytesToWrite - 4;
  for (var i = 0; i < str.length; ++i) {
    // Gotcha: charCodeAt returns a 16-bit word that is a UTF-16 encoded code unit, not a Unicode code point of the character! We must decode the string to UTF-32 to the heap.
    // See http://unicode.org/faq/utf_bom.html#utf16-3
    var codeUnit = str.charCodeAt(i); // possibly a lead surrogate
    if (codeUnit >= 0xD800 && codeUnit <= 0xDFFF) {
      var trailSurrogate = str.charCodeAt(++i);
      codeUnit = 0x10000 + ((codeUnit & 0x3FF) << 10) | (trailSurrogate & 0x3FF);
    }
    HEAP32[((outPtr)>>2)] = codeUnit;
    outPtr += 4;
    if (outPtr + 4 > endPtr) break;
  }
  // Null-terminate the pointer to the HEAP.
  HEAP32[((outPtr)>>2)] = 0;
  return outPtr - startPtr;
}

// Returns the number of bytes the given Javascript string takes if encoded as a UTF16 byte array, EXCLUDING the null terminator byte.

function lengthBytesUTF32(str) {
  var len = 0;
  for (var i = 0; i < str.length; ++i) {
    // Gotcha: charCodeAt returns a 16-bit word that is a UTF-16 encoded code unit, not a Unicode code point of the character! We must decode the string to UTF-32 to the heap.
    // See http://unicode.org/faq/utf_bom.html#utf16-3
    var codeUnit = str.charCodeAt(i);
    if (codeUnit >= 0xD800 && codeUnit <= 0xDFFF) ++i; // possibly a lead surrogate, so skip over the tail surrogate.
    len += 4;
  }

  return len;
}

// Allocate heap space for a JS string, and write it there.
// It is the responsibility of the caller to free() that memory.
function allocateUTF8(str) {
  var size = lengthBytesUTF8(str) + 1;
  var ret = _malloc(size);
  if (ret) stringToUTF8Array(str, HEAP8, ret, size);
  return ret;
}

// Allocate stack space for a JS string, and write it there.
function allocateUTF8OnStack(str) {
  var size = lengthBytesUTF8(str) + 1;
  var ret = stackAlloc(size);
  stringToUTF8Array(str, HEAP8, ret, size);
  return ret;
}

// Deprecated: This function should not be called because it is unsafe and does not provide
// a maximum length limit of how many bytes it is allowed to write. Prefer calling the
// function stringToUTF8Array() instead, which takes in a maximum length that can be used
// to be secure from out of bounds writes.
/** @deprecated
    @param {boolean=} dontAddNull */
function writeStringToMemory(string, buffer, dontAddNull) {
  warnOnce('writeStringToMemory is deprecated and should not be called! Use stringToUTF8() instead!');

  var /** @type {number} */ lastChar, /** @type {number} */ end;
  if (dontAddNull) {
    // stringToUTF8Array always appends null. If we don't want to do that, remember the
    // character that existed at the location where the null will be placed, and restore
    // that after the write (below).
    end = buffer + lengthBytesUTF8(string);
    lastChar = HEAP8[end];
  }
  stringToUTF8(string, buffer, Infinity);
  if (dontAddNull) HEAP8[end] = lastChar; // Restore the value under the null character.
}

function writeArrayToMemory(array, buffer) {
  assert(array.length >= 0, 'writeArrayToMemory array must have a length (should be an array or typed array)')
  HEAP8.set(array, buffer);
}

/** @param {boolean=} dontAddNull */
function writeAsciiToMemory(str, buffer, dontAddNull) {
  for (var i = 0; i < str.length; ++i) {
    assert(str.charCodeAt(i) === str.charCodeAt(i)&0xff);
    HEAP8[((buffer++)>>0)] = str.charCodeAt(i);
  }
  // Null-terminate the pointer to the HEAP.
  if (!dontAddNull) HEAP8[((buffer)>>0)] = 0;
}

// end include: runtime_strings_extra.js
// Memory management

function alignUp(x, multiple) {
  if (x % multiple > 0) {
    x += multiple - (x % multiple);
  }
  return x;
}

var HEAP,
/** @type {ArrayBuffer} */
  buffer,
/** @type {Int8Array} */
  HEAP8,
/** @type {Uint8Array} */
  HEAPU8,
/** @type {Int16Array} */
  HEAP16,
/** @type {Uint16Array} */
  HEAPU16,
/** @type {Int32Array} */
  HEAP32,
/** @type {Uint32Array} */
  HEAPU32,
/** @type {Float32Array} */
  HEAPF32,
/** @type {Float64Array} */
  HEAPF64;

function updateGlobalBufferAndViews(buf) {
  buffer = buf;
  Module['HEAP8'] = HEAP8 = new Int8Array(buf);
  Module['HEAP16'] = HEAP16 = new Int16Array(buf);
  Module['HEAP32'] = HEAP32 = new Int32Array(buf);
  Module['HEAPU8'] = HEAPU8 = new Uint8Array(buf);
  Module['HEAPU16'] = HEAPU16 = new Uint16Array(buf);
  Module['HEAPU32'] = HEAPU32 = new Uint32Array(buf);
  Module['HEAPF32'] = HEAPF32 = new Float32Array(buf);
  Module['HEAPF64'] = HEAPF64 = new Float64Array(buf);
}

var TOTAL_STACK = 5242880;
if (Module['TOTAL_STACK']) assert(TOTAL_STACK === Module['TOTAL_STACK'], 'the stack size can no longer be determined at runtime')

var INITIAL_MEMORY = Module['INITIAL_MEMORY'] || 67108864;
if (!Object.getOwnPropertyDescriptor(Module, 'INITIAL_MEMORY')) {
  Object.defineProperty(Module, 'INITIAL_MEMORY', {
    configurable: true,
    get: function() {
      abort('Module.INITIAL_MEMORY has been replaced with plain INITIAL_MEMORY (the initial value can be provided on Module, but after startup the value is only looked for on a local variable of that name)')
    }
  });
}

assert(INITIAL_MEMORY >= TOTAL_STACK, 'INITIAL_MEMORY should be larger than TOTAL_STACK, was ' + INITIAL_MEMORY + '! (TOTAL_STACK=' + TOTAL_STACK + ')');

// check for full engine support (use string 'subarray' to avoid closure compiler confusion)
assert(typeof Int32Array !== 'undefined' && typeof Float64Array !== 'undefined' && Int32Array.prototype.subarray !== undefined && Int32Array.prototype.set !== undefined,
       'JS engine does not provide full typed array support');

// If memory is defined in wasm, the user can't provide it.
assert(!Module['wasmMemory'], 'Use of `wasmMemory` detected.  Use -s IMPORTED_MEMORY to define wasmMemory externally');
assert(INITIAL_MEMORY == 67108864, 'Detected runtime INITIAL_MEMORY setting.  Use -s IMPORTED_MEMORY to define wasmMemory dynamically');

// include: runtime_init_table.js
// In regular non-RELOCATABLE mode the table is exported
// from the wasm module and this will be assigned once
// the exports are available.
var wasmTable;

// end include: runtime_init_table.js
// include: runtime_stack_check.js


// Initializes the stack cookie. Called at the startup of main and at the startup of each thread in pthreads mode.
function writeStackCookie() {
  var max = _emscripten_stack_get_end();
  assert((max & 3) == 0);
  // The stack grows downwards
  HEAPU32[(max >> 2)+1] = 0x2135467;
  HEAPU32[(max >> 2)+2] = 0x89BACDFE;
  // Also test the global address 0 for integrity.
  HEAP32[0] = 0x63736d65; /* 'emsc' */
}

function checkStackCookie() {
  if (ABORT) return;
  var max = _emscripten_stack_get_end();
  var cookie1 = HEAPU32[(max >> 2)+1];
  var cookie2 = HEAPU32[(max >> 2)+2];
  if (cookie1 != 0x2135467 || cookie2 != 0x89BACDFE) {
    abort('Stack overflow! Stack cookie has been overwritten, expected hex dwords 0x89BACDFE and 0x2135467, but received 0x' + cookie2.toString(16) + ' ' + cookie1.toString(16));
  }
  // Also test the global address 0 for integrity.
  if (HEAP32[0] !== 0x63736d65 /* 'emsc' */) abort('Runtime error: The application has corrupted its heap memory area (address zero)!');
}

// end include: runtime_stack_check.js
// include: runtime_assertions.js


// Endianness check
(function() {
  var h16 = new Int16Array(1);
  var h8 = new Int8Array(h16.buffer);
  h16[0] = 0x6373;
  if (h8[0] !== 0x73 || h8[1] !== 0x63) throw 'Runtime error: expected the system to be little-endian! (Run with -s SUPPORT_BIG_ENDIAN=1 to bypass)';
})();

// end include: runtime_assertions.js
var __ATPRERUN__  = []; // functions called before the runtime is initialized
var __ATINIT__    = []; // functions called during startup
var __ATMAIN__    = []; // functions called when main() is to be run
var __ATEXIT__    = []; // functions called during shutdown
var __ATPOSTRUN__ = []; // functions called after the main() is called

var runtimeInitialized = false;
var runtimeExited = false;

function preRun() {

  if (Module['preRun']) {
    if (typeof Module['preRun'] == 'function') Module['preRun'] = [Module['preRun']];
    while (Module['preRun'].length) {
      addOnPreRun(Module['preRun'].shift());
    }
  }

  callRuntimeCallbacks(__ATPRERUN__);
}

function initRuntime() {
  checkStackCookie();
  assert(!runtimeInitialized);
  runtimeInitialized = true;

  if (!Module["noFSInit"] && !FS.init.initialized) FS.init();
TTY.init();
  callRuntimeCallbacks(__ATINIT__);
}

function preMain() {
  checkStackCookie();
  FS.ignorePermissions = false;
  callRuntimeCallbacks(__ATMAIN__);
}

function exitRuntime() {
  checkStackCookie();
  Asyncify.checkStateAfterExitRuntime();
  runtimeExited = true;
}

function postRun() {
  checkStackCookie();

  if (Module['postRun']) {
    if (typeof Module['postRun'] == 'function') Module['postRun'] = [Module['postRun']];
    while (Module['postRun'].length) {
      addOnPostRun(Module['postRun'].shift());
    }
  }

  callRuntimeCallbacks(__ATPOSTRUN__);
}

function addOnPreRun(cb) {
  __ATPRERUN__.unshift(cb);
}

function addOnInit(cb) {
  __ATINIT__.unshift(cb);
}

function addOnPreMain(cb) {
  __ATMAIN__.unshift(cb);
}

function addOnExit(cb) {
}

function addOnPostRun(cb) {
  __ATPOSTRUN__.unshift(cb);
}

// include: runtime_math.js


// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/imul

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/fround

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/clz32

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc

assert(Math.imul, 'This browser does not support Math.imul(), build with LEGACY_VM_SUPPORT or POLYFILL_OLD_MATH_FUNCTIONS to add in a polyfill');
assert(Math.fround, 'This browser does not support Math.fround(), build with LEGACY_VM_SUPPORT or POLYFILL_OLD_MATH_FUNCTIONS to add in a polyfill');
assert(Math.clz32, 'This browser does not support Math.clz32(), build with LEGACY_VM_SUPPORT or POLYFILL_OLD_MATH_FUNCTIONS to add in a polyfill');
assert(Math.trunc, 'This browser does not support Math.trunc(), build with LEGACY_VM_SUPPORT or POLYFILL_OLD_MATH_FUNCTIONS to add in a polyfill');

// end include: runtime_math.js
// A counter of dependencies for calling run(). If we need to
// do asynchronous work before running, increment this and
// decrement it. Incrementing must happen in a place like
// Module.preRun (used by emcc to add file preloading).
// Note that you can add dependencies in preRun, even though
// it happens right before run - run will be postponed until
// the dependencies are met.
var runDependencies = 0;
var runDependencyWatcher = null;
var dependenciesFulfilled = null; // overridden to take different actions when all run dependencies are fulfilled
var runDependencyTracking = {};

function getUniqueRunDependency(id) {
  var orig = id;
  while (1) {
    if (!runDependencyTracking[id]) return id;
    id = orig + Math.random();
  }
}

function addRunDependency(id) {
  runDependencies++;

  if (Module['monitorRunDependencies']) {
    Module['monitorRunDependencies'](runDependencies);
  }

  if (id) {
    assert(!runDependencyTracking[id]);
    runDependencyTracking[id] = 1;
    if (runDependencyWatcher === null && typeof setInterval !== 'undefined') {
      // Check for missing dependencies every few seconds
      runDependencyWatcher = setInterval(function() {
        if (ABORT) {
          clearInterval(runDependencyWatcher);
          runDependencyWatcher = null;
          return;
        }
        var shown = false;
        for (var dep in runDependencyTracking) {
          if (!shown) {
            shown = true;
            err('still waiting on run dependencies:');
          }
          err('dependency: ' + dep);
        }
        if (shown) {
          err('(end of list)');
        }
      }, 10000);
    }
  } else {
    err('warning: run dependency added without ID');
  }
}

function removeRunDependency(id) {
  runDependencies--;

  if (Module['monitorRunDependencies']) {
    Module['monitorRunDependencies'](runDependencies);
  }

  if (id) {
    assert(runDependencyTracking[id]);
    delete runDependencyTracking[id];
  } else {
    err('warning: run dependency removed without ID');
  }
  if (runDependencies == 0) {
    if (runDependencyWatcher !== null) {
      clearInterval(runDependencyWatcher);
      runDependencyWatcher = null;
    }
    if (dependenciesFulfilled) {
      var callback = dependenciesFulfilled;
      dependenciesFulfilled = null;
      callback(); // can add another dependenciesFulfilled
    }
  }
}

Module["preloadedImages"] = {}; // maps url to image data
Module["preloadedAudios"] = {}; // maps url to audio data

/** @param {string|number=} what */
function abort(what) {
  if (Module['onAbort']) {
    Module['onAbort'](what);
  }

  what += '';
  err(what);

  ABORT = true;
  EXITSTATUS = 1;

  var output = 'abort(' + what + ') at ' + stackTrace();
  what = output;

  // Use a wasm runtime error, because a JS error might be seen as a foreign
  // exception, which means we'd run destructors on it. We need the error to
  // simply make the program stop.
  var e = new WebAssembly.RuntimeError(what);

  // Throw the error whether or not MODULARIZE is set because abort is used
  // in code paths apart from instantiation where an exception is expected
  // to be thrown when abort is called.
  throw e;
}

// {{MEM_INITIALIZER}}

// include: memoryprofiler.js


// end include: memoryprofiler.js
// include: URIUtils.js


// Prefix of data URIs emitted by SINGLE_FILE and related options.
var dataURIPrefix = 'data:application/octet-stream;base64,';

// Indicates whether filename is a base64 data URI.
function isDataURI(filename) {
  // Prefix of data URIs emitted by SINGLE_FILE and related options.
  return filename.startsWith(dataURIPrefix);
}

// Indicates whether filename is delivered via file protocol (as opposed to http/https)
function isFileURI(filename) {
  return filename.startsWith('file://');
}

// end include: URIUtils.js
function createExportWrapper(name, fixedasm) {
  return function() {
    var displayName = name;
    var asm = fixedasm;
    if (!fixedasm) {
      asm = Module['asm'];
    }
    assert(runtimeInitialized, 'native function `' + displayName + '` called before runtime initialization');
    assert(!runtimeExited, 'native function `' + displayName + '` called after runtime exit (use NO_EXIT_RUNTIME to keep it alive after main() exits)');
    if (!asm[name]) {
      assert(asm[name], 'exported native function `' + displayName + '` not found');
    }
    return asm[name].apply(null, arguments);
  };
}

  var wasmBinaryFile = 'hlms.wasm';
  if (!isDataURI(wasmBinaryFile)) {
    wasmBinaryFile = locateFile(wasmBinaryFile);
  }

function getBinary(file) {
  try {
    if (file == wasmBinaryFile && wasmBinary) {
      return new Uint8Array(wasmBinary);
    }
    if (readBinary) {
      return readBinary(file);
    } else {
      throw "both async and sync fetching of the wasm failed";
    }
  }
  catch (err) {
    abort(err);
  }
}

function getBinaryPromise() {
  // If we don't have the binary yet, try to to load it asynchronously.
  // Fetch has some additional restrictions over XHR, like it can't be used on a file:// url.
  // See https://github.com/github/fetch/pull/92#issuecomment-140665932
  // Cordova or Electron apps are typically loaded from a file:// url.
  // So use fetch if it is available and the url is not a file, otherwise fall back to XHR.
  if (!wasmBinary && (ENVIRONMENT_IS_WEB || ENVIRONMENT_IS_WORKER)) {
    if (typeof fetch === 'function'
      && !isFileURI(wasmBinaryFile)
    ) {
      return fetch(wasmBinaryFile, { credentials: 'same-origin' }).then(function(response) {
        if (!response['ok']) {
          throw "failed to load wasm binary file at '" + wasmBinaryFile + "'";
        }
        return response['arrayBuffer']();
      }).catch(function () {
          return getBinary(wasmBinaryFile);
      });
    }
    else {
      if (readAsync) {
        // fetch is not available or url is file => try XHR (readAsync uses XHR internally)
        return new Promise(function(resolve, reject) {
          readAsync(wasmBinaryFile, function(response) { resolve(new Uint8Array(/** @type{!ArrayBuffer} */(response))) }, reject)
        });
      }
    }
  }

  // Otherwise, getBinary should be able to get it synchronously
  return Promise.resolve().then(function() { return getBinary(wasmBinaryFile); });
}

// Create the wasm instance.
// Receives the wasm imports, returns the exports.
function createWasm() {
  // prepare imports
  var info = {
    'env': asmLibraryArg,
    'wasi_snapshot_preview1': asmLibraryArg,
  };
  // Load the wasm module and create an instance of using native support in the JS engine.
  // handle a generated wasm instance, receiving its exports and
  // performing other necessary setup
  /** @param {WebAssembly.Module=} module*/
  function receiveInstance(instance, module) {
    var exports = instance.exports;

    exports = Asyncify.instrumentWasmExports(exports);

    Module['asm'] = exports;

    wasmMemory = Module['asm']['memory'];
    assert(wasmMemory, "memory not found in wasm exports");
    // This assertion doesn't hold when emscripten is run in --post-link
    // mode.
    // TODO(sbc): Read INITIAL_MEMORY out of the wasm file in post-link mode.
    //assert(wasmMemory.buffer.byteLength === 67108864);
    updateGlobalBufferAndViews(wasmMemory.buffer);

    wasmTable = Module['asm']['__indirect_function_table'];
    assert(wasmTable, "table not found in wasm exports");

    addOnInit(Module['asm']['__wasm_call_ctors']);

    removeRunDependency('wasm-instantiate');
  }
  // we can't run yet (except in a pthread, where we have a custom sync instantiator)
  addRunDependency('wasm-instantiate');

  // Prefer streaming instantiation if available.
  // Async compilation can be confusing when an error on the page overwrites Module
  // (for example, if the order of elements is wrong, and the one defining Module is
  // later), so we save Module and check it later.
  var trueModule = Module;
  function receiveInstantiationResult(result) {
    // 'result' is a ResultObject object which has both the module and instance.
    // receiveInstance() will swap in the exports (to Module.asm) so they can be called
    assert(Module === trueModule, 'the Module object should not be replaced during async compilation - perhaps the order of HTML elements is wrong?');
    trueModule = null;
    // TODO: Due to Closure regression https://github.com/google/closure-compiler/issues/3193, the above line no longer optimizes out down to the following line.
    // When the regression is fixed, can restore the above USE_PTHREADS-enabled path.
    receiveInstance(result['instance']);
  }

  function instantiateArrayBuffer(receiver) {
    return getBinaryPromise().then(function(binary) {
      var result = WebAssembly.instantiate(binary, info);
      return result;
    }).then(receiver, function(reason) {
      err('failed to asynchronously prepare wasm: ' + reason);

      // Warn on some common problems.
      if (isFileURI(wasmBinaryFile)) {
        err('warning: Loading from a file URI (' + wasmBinaryFile + ') is not supported in most browsers. See https://emscripten.org/docs/getting_started/FAQ.html#how-do-i-run-a-local-webserver-for-testing-why-does-my-program-stall-in-downloading-or-preparing');
      }
      abort(reason);
    });
  }

  function instantiateAsync() {
    if (!wasmBinary &&
        typeof WebAssembly.instantiateStreaming === 'function' &&
        !isDataURI(wasmBinaryFile) &&
        // Don't use streaming for file:// delivered objects in a webview, fetch them synchronously.
        !isFileURI(wasmBinaryFile) &&
        typeof fetch === 'function') {
      return fetch(wasmBinaryFile, { credentials: 'same-origin' }).then(function (response) {
        var result = WebAssembly.instantiateStreaming(response, info);
        return result.then(receiveInstantiationResult, function(reason) {
            // We expect the most common failure cause to be a bad MIME type for the binary,
            // in which case falling back to ArrayBuffer instantiation should work.
            err('wasm streaming compile failed: ' + reason);
            err('falling back to ArrayBuffer instantiation');
            return instantiateArrayBuffer(receiveInstantiationResult);
          });
      });
    } else {
      return instantiateArrayBuffer(receiveInstantiationResult);
    }
  }

  // User shell pages can write their own Module.instantiateWasm = function(imports, successCallback) callback
  // to manually instantiate the Wasm module themselves. This allows pages to run the instantiation parallel
  // to any other async startup actions they are performing.
  if (Module['instantiateWasm']) {
    try {
      var exports = Module['instantiateWasm'](info, receiveInstance);
      exports = Asyncify.instrumentWasmExports(exports);
      return exports;
    } catch(e) {
      err('Module.instantiateWasm callback failed with error: ' + e);
      return false;
    }
  }

  instantiateAsync();
  return {}; // no exports yet; we'll fill them in later
}

// Globals used by JS i64 conversions (see makeSetValue)
var tempDouble;
var tempI64;

// === Body ===

var ASM_CONSTS = {
  8820: function() {hlms_model_load_complete(true);},  
 8852: function() {hlms_ready();},  
 8866: function() {hlms_model_load_complete(false);}
};






  function callRuntimeCallbacks(callbacks) {
      while (callbacks.length > 0) {
        var callback = callbacks.shift();
        if (typeof callback == 'function') {
          callback(Module); // Pass the module as the first argument.
          continue;
        }
        var func = callback.func;
        if (typeof func === 'number') {
          if (callback.arg === undefined) {
            (function() {  dynCall_v.call(null, func); })();
          } else {
            (function(a1) {  dynCall_vi.apply(null, [func, a1]); })(callback.arg);
          }
        } else {
          func(callback.arg === undefined ? null : callback.arg);
        }
      }
    }

  function demangle(func) {
      warnOnce('warning: build with  -s DEMANGLE_SUPPORT=1  to link in libcxxabi demangling');
      return func;
    }

  function demangleAll(text) {
      var regex =
        /\b_Z[\w\d_]+/g;
      return text.replace(regex,
        function(x) {
          var y = demangle(x);
          return x === y ? x : (y + ' [' + x + ']');
        });
    }

  function jsStackTrace() {
      var error = new Error();
      if (!error.stack) {
        // IE10+ special cases: It does have callstack info, but it is only populated if an Error object is thrown,
        // so try that as a special-case.
        try {
          throw new Error();
        } catch(e) {
          error = e;
        }
        if (!error.stack) {
          return '(no stack trace available)';
        }
      }
      return error.stack.toString();
    }

  var runtimeKeepaliveCounter=0;
  function keepRuntimeAlive() {
      return noExitRuntime || runtimeKeepaliveCounter > 0;
    }

  function stackTrace() {
      var js = jsStackTrace();
      if (Module['extraStackTrace']) js += '\n' + Module['extraStackTrace']();
      return demangleAll(js);
    }

  function _tzset() {
      // TODO: Use (malleable) environment variables instead of system settings.
      if (_tzset.called) return;
      _tzset.called = true;
  
      var currentYear = new Date().getFullYear();
      var winter = new Date(currentYear, 0, 1);
      var summer = new Date(currentYear, 6, 1);
      var winterOffset = winter.getTimezoneOffset();
      var summerOffset = summer.getTimezoneOffset();
  
      // Local standard timezone offset. Local standard time is not adjusted for daylight savings.
      // This code uses the fact that getTimezoneOffset returns a greater value during Standard Time versus Daylight Saving Time (DST). 
      // Thus it determines the expected output during Standard Time, and it compares whether the output of the given date the same (Standard) or less (DST).
      var stdTimezoneOffset = Math.max(winterOffset, summerOffset);
  
      // timezone is specified as seconds west of UTC ("The external variable
      // `timezone` shall be set to the difference, in seconds, between
      // Coordinated Universal Time (UTC) and local standard time."), the same
      // as returned by stdTimezoneOffset.
      // See http://pubs.opengroup.org/onlinepubs/009695399/functions/tzset.html
      HEAP32[((__get_timezone())>>2)] = stdTimezoneOffset * 60;
  
      HEAP32[((__get_daylight())>>2)] = Number(winterOffset != summerOffset);
  
      function extractZone(date) {
        var match = date.toTimeString().match(/\(([A-Za-z ]+)\)$/);
        return match ? match[1] : "GMT";
      };
      var winterName = extractZone(winter);
      var summerName = extractZone(summer);
      var winterNamePtr = allocateUTF8(winterName);
      var summerNamePtr = allocateUTF8(summerName);
      if (summerOffset < winterOffset) {
        // Northern hemisphere
        HEAP32[((__get_tzname())>>2)] = winterNamePtr;
        HEAP32[(((__get_tzname())+(4))>>2)] = summerNamePtr;
      } else {
        HEAP32[((__get_tzname())>>2)] = summerNamePtr;
        HEAP32[(((__get_tzname())+(4))>>2)] = winterNamePtr;
      }
    }
  function _mktime(tmPtr) {
      _tzset();
      var date = new Date(HEAP32[(((tmPtr)+(20))>>2)] + 1900,
                          HEAP32[(((tmPtr)+(16))>>2)],
                          HEAP32[(((tmPtr)+(12))>>2)],
                          HEAP32[(((tmPtr)+(8))>>2)],
                          HEAP32[(((tmPtr)+(4))>>2)],
                          HEAP32[((tmPtr)>>2)],
                          0);
  
      // There's an ambiguous hour when the time goes back; the tm_isdst field is
      // used to disambiguate it.  Date() basically guesses, so we fix it up if it
      // guessed wrong, or fill in tm_isdst with the guess if it's -1.
      var dst = HEAP32[(((tmPtr)+(32))>>2)];
      var guessedOffset = date.getTimezoneOffset();
      var start = new Date(date.getFullYear(), 0, 1);
      var summerOffset = new Date(date.getFullYear(), 6, 1).getTimezoneOffset();
      var winterOffset = start.getTimezoneOffset();
      var dstOffset = Math.min(winterOffset, summerOffset); // DST is in December in South
      if (dst < 0) {
        // Attention: some regions don't have DST at all.
        HEAP32[(((tmPtr)+(32))>>2)] = Number(summerOffset != winterOffset && dstOffset == guessedOffset);
      } else if ((dst > 0) != (dstOffset == guessedOffset)) {
        var nonDstOffset = Math.max(winterOffset, summerOffset);
        var trueOffset = dst > 0 ? dstOffset : nonDstOffset;
        // Don't try setMinutes(date.getMinutes() + ...) -- it's messed up.
        date.setTime(date.getTime() + (trueOffset - guessedOffset)*60000);
      }
  
      HEAP32[(((tmPtr)+(24))>>2)] = date.getDay();
      var yday = ((date.getTime() - start.getTime()) / (1000 * 60 * 60 * 24))|0;
      HEAP32[(((tmPtr)+(28))>>2)] = yday;
      // To match expected behavior, update fields from date
      HEAP32[((tmPtr)>>2)] = date.getSeconds();
      HEAP32[(((tmPtr)+(4))>>2)] = date.getMinutes();
      HEAP32[(((tmPtr)+(8))>>2)] = date.getHours();
      HEAP32[(((tmPtr)+(12))>>2)] = date.getDate();
      HEAP32[(((tmPtr)+(16))>>2)] = date.getMonth();
  
      return (date.getTime() / 1000)|0;
    }
  function ___asctime(tmPtr, buf) {
      var date = {
        tm_sec: HEAP32[((tmPtr)>>2)],
        tm_min: HEAP32[(((tmPtr)+(4))>>2)],
        tm_hour: HEAP32[(((tmPtr)+(8))>>2)],
        tm_mday: HEAP32[(((tmPtr)+(12))>>2)],
        tm_mon: HEAP32[(((tmPtr)+(16))>>2)],
        tm_year: HEAP32[(((tmPtr)+(20))>>2)],
        tm_wday: HEAP32[(((tmPtr)+(24))>>2)]
      };
      var days = [ "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" ];
      var months = [ "Jan", "Feb", "Mar", "Apr", "May", "Jun",
                     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" ];
      var s = days[date.tm_wday] + ' ' + months[date.tm_mon] +
          (date.tm_mday < 10 ? '  ' : ' ') + date.tm_mday +
          (date.tm_hour < 10 ? ' 0' : ' ') + date.tm_hour +
          (date.tm_min < 10 ? ':0' : ':') + date.tm_min +
          (date.tm_sec < 10 ? ':0' : ':') + date.tm_sec +
          ' ' + (1900 + date.tm_year) + "\n";
  
      // asctime_r is specced to behave in an undefined manner if the algorithm would attempt
      // to write out more than 26 bytes (including the null terminator).
      // See http://pubs.opengroup.org/onlinepubs/9699919799/functions/asctime.html
      // Our undefined behavior is to truncate the write to at most 26 bytes, including null terminator.
      stringToUTF8(s, buf, 26);
      return buf;
    }

  function ___assert_fail(condition, filename, line, func) {
      abort('Assertion failed: ' + UTF8ToString(condition) + ', at: ' + [filename ? UTF8ToString(filename) : 'unknown filename', line, func ? UTF8ToString(func) : 'unknown function']);
    }

  var ExceptionInfoAttrs={DESTRUCTOR_OFFSET:0,REFCOUNT_OFFSET:4,TYPE_OFFSET:8,CAUGHT_OFFSET:12,RETHROWN_OFFSET:13,SIZE:16};
  function ___cxa_allocate_exception(size) {
      // Thrown object is prepended by exception metadata block
      return _malloc(size + ExceptionInfoAttrs.SIZE) + ExceptionInfoAttrs.SIZE;
    }

  function _atexit(func, arg) {
    }
  function ___cxa_atexit(a0,a1
  ) {
  return _atexit(a0,a1);
  }

  function ExceptionInfo(excPtr) {
      this.excPtr = excPtr;
      this.ptr = excPtr - ExceptionInfoAttrs.SIZE;
  
      this.set_type = function(type) {
        HEAP32[(((this.ptr)+(ExceptionInfoAttrs.TYPE_OFFSET))>>2)] = type;
      };
  
      this.get_type = function() {
        return HEAP32[(((this.ptr)+(ExceptionInfoAttrs.TYPE_OFFSET))>>2)];
      };
  
      this.set_destructor = function(destructor) {
        HEAP32[(((this.ptr)+(ExceptionInfoAttrs.DESTRUCTOR_OFFSET))>>2)] = destructor;
      };
  
      this.get_destructor = function() {
        return HEAP32[(((this.ptr)+(ExceptionInfoAttrs.DESTRUCTOR_OFFSET))>>2)];
      };
  
      this.set_refcount = function(refcount) {
        HEAP32[(((this.ptr)+(ExceptionInfoAttrs.REFCOUNT_OFFSET))>>2)] = refcount;
      };
  
      this.set_caught = function (caught) {
        caught = caught ? 1 : 0;
        HEAP8[(((this.ptr)+(ExceptionInfoAttrs.CAUGHT_OFFSET))>>0)] = caught;
      };
  
      this.get_caught = function () {
        return HEAP8[(((this.ptr)+(ExceptionInfoAttrs.CAUGHT_OFFSET))>>0)] != 0;
      };
  
      this.set_rethrown = function (rethrown) {
        rethrown = rethrown ? 1 : 0;
        HEAP8[(((this.ptr)+(ExceptionInfoAttrs.RETHROWN_OFFSET))>>0)] = rethrown;
      };
  
      this.get_rethrown = function () {
        return HEAP8[(((this.ptr)+(ExceptionInfoAttrs.RETHROWN_OFFSET))>>0)] != 0;
      };
  
      // Initialize native structure fields. Should be called once after allocated.
      this.init = function(type, destructor) {
        this.set_type(type);
        this.set_destructor(destructor);
        this.set_refcount(0);
        this.set_caught(false);
        this.set_rethrown(false);
      }
  
      this.add_ref = function() {
        var value = HEAP32[(((this.ptr)+(ExceptionInfoAttrs.REFCOUNT_OFFSET))>>2)];
        HEAP32[(((this.ptr)+(ExceptionInfoAttrs.REFCOUNT_OFFSET))>>2)] = value + 1;
      };
  
      // Returns true if last reference released.
      this.release_ref = function() {
        var prev = HEAP32[(((this.ptr)+(ExceptionInfoAttrs.REFCOUNT_OFFSET))>>2)];
        HEAP32[(((this.ptr)+(ExceptionInfoAttrs.REFCOUNT_OFFSET))>>2)] = prev - 1;
        assert(prev > 0);
        return prev === 1;
      };
    }
  
  var exceptionLast=0;
  
  var uncaughtExceptionCount=0;
  function ___cxa_throw(ptr, type, destructor) {
      var info = new ExceptionInfo(ptr);
      // Initialize ExceptionInfo content after it was allocated in __cxa_allocate_exception.
      info.init(type, destructor);
      exceptionLast = ptr;
      uncaughtExceptionCount++;
      throw ptr + " - Exception catching is disabled, this exception cannot be caught. Compile with -s NO_DISABLE_EXCEPTION_CATCHING or -s EXCEPTION_CATCHING_ALLOWED=[..] to catch.";
    }

  function _localtime_r(time, tmPtr) {
      _tzset();
      var date = new Date(HEAP32[((time)>>2)]*1000);
      HEAP32[((tmPtr)>>2)] = date.getSeconds();
      HEAP32[(((tmPtr)+(4))>>2)] = date.getMinutes();
      HEAP32[(((tmPtr)+(8))>>2)] = date.getHours();
      HEAP32[(((tmPtr)+(12))>>2)] = date.getDate();
      HEAP32[(((tmPtr)+(16))>>2)] = date.getMonth();
      HEAP32[(((tmPtr)+(20))>>2)] = date.getFullYear()-1900;
      HEAP32[(((tmPtr)+(24))>>2)] = date.getDay();
  
      var start = new Date(date.getFullYear(), 0, 1);
      var yday = ((date.getTime() - start.getTime()) / (1000 * 60 * 60 * 24))|0;
      HEAP32[(((tmPtr)+(28))>>2)] = yday;
      HEAP32[(((tmPtr)+(36))>>2)] = -(date.getTimezoneOffset() * 60);
  
      // Attention: DST is in December in South, and some regions don't have DST at all.
      var summerOffset = new Date(date.getFullYear(), 6, 1).getTimezoneOffset();
      var winterOffset = start.getTimezoneOffset();
      var dst = (summerOffset != winterOffset && date.getTimezoneOffset() == Math.min(winterOffset, summerOffset))|0;
      HEAP32[(((tmPtr)+(32))>>2)] = dst;
  
      var zonePtr = HEAP32[(((__get_tzname())+(dst ? 4 : 0))>>2)];
      HEAP32[(((tmPtr)+(40))>>2)] = zonePtr;
  
      return tmPtr;
    }
  function ___localtime_r(a0,a1
  ) {
  return _localtime_r(a0,a1);
  }

  function setErrNo(value) {
      HEAP32[((___errno_location())>>2)] = value;
      return value;
    }
  
  var PATH={splitPath:function(filename) {
        var splitPathRe = /^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;
        return splitPathRe.exec(filename).slice(1);
      },normalizeArray:function(parts, allowAboveRoot) {
        // if the path tries to go above the root, `up` ends up > 0
        var up = 0;
        for (var i = parts.length - 1; i >= 0; i--) {
          var last = parts[i];
          if (last === '.') {
            parts.splice(i, 1);
          } else if (last === '..') {
            parts.splice(i, 1);
            up++;
          } else if (up) {
            parts.splice(i, 1);
            up--;
          }
        }
        // if the path is allowed to go above the root, restore leading ..s
        if (allowAboveRoot) {
          for (; up; up--) {
            parts.unshift('..');
          }
        }
        return parts;
      },normalize:function(path) {
        var isAbsolute = path.charAt(0) === '/',
            trailingSlash = path.substr(-1) === '/';
        // Normalize the path
        path = PATH.normalizeArray(path.split('/').filter(function(p) {
          return !!p;
        }), !isAbsolute).join('/');
        if (!path && !isAbsolute) {
          path = '.';
        }
        if (path && trailingSlash) {
          path += '/';
        }
        return (isAbsolute ? '/' : '') + path;
      },dirname:function(path) {
        var result = PATH.splitPath(path),
            root = result[0],
            dir = result[1];
        if (!root && !dir) {
          // No dirname whatsoever
          return '.';
        }
        if (dir) {
          // It has a dirname, strip trailing slash
          dir = dir.substr(0, dir.length - 1);
        }
        return root + dir;
      },basename:function(path) {
        // EMSCRIPTEN return '/'' for '/', not an empty string
        if (path === '/') return '/';
        path = PATH.normalize(path);
        path = path.replace(/\/$/, "");
        var lastSlash = path.lastIndexOf('/');
        if (lastSlash === -1) return path;
        return path.substr(lastSlash+1);
      },extname:function(path) {
        return PATH.splitPath(path)[3];
      },join:function() {
        var paths = Array.prototype.slice.call(arguments, 0);
        return PATH.normalize(paths.join('/'));
      },join2:function(l, r) {
        return PATH.normalize(l + '/' + r);
      }};
  
  function getRandomDevice() {
      if (typeof crypto === 'object' && typeof crypto['getRandomValues'] === 'function') {
        // for modern web browsers
        var randomBuffer = new Uint8Array(1);
        return function() { crypto.getRandomValues(randomBuffer); return randomBuffer[0]; };
      } else
      if (ENVIRONMENT_IS_NODE) {
        // for nodejs with or without crypto support included
        try {
          var crypto_module = require('crypto');
          // nodejs has crypto support
          return function() { return crypto_module['randomBytes'](1)[0]; };
        } catch (e) {
          // nodejs doesn't have crypto support
        }
      }
      // we couldn't find a proper implementation, as Math.random() is not suitable for /dev/random, see emscripten-core/emscripten/pull/7096
      return function() { abort("no cryptographic support found for randomDevice. consider polyfilling it if you want to use something insecure like Math.random(), e.g. put this in a --pre-js: var crypto = { getRandomValues: function(array) { for (var i = 0; i < array.length; i++) array[i] = (Math.random()*256)|0 } };"); };
    }
  
  var PATH_FS={resolve:function() {
        var resolvedPath = '',
          resolvedAbsolute = false;
        for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
          var path = (i >= 0) ? arguments[i] : FS.cwd();
          // Skip empty and invalid entries
          if (typeof path !== 'string') {
            throw new TypeError('Arguments to path.resolve must be strings');
          } else if (!path) {
            return ''; // an invalid portion invalidates the whole thing
          }
          resolvedPath = path + '/' + resolvedPath;
          resolvedAbsolute = path.charAt(0) === '/';
        }
        // At this point the path should be resolved to a full absolute path, but
        // handle relative paths to be safe (might happen when process.cwd() fails)
        resolvedPath = PATH.normalizeArray(resolvedPath.split('/').filter(function(p) {
          return !!p;
        }), !resolvedAbsolute).join('/');
        return ((resolvedAbsolute ? '/' : '') + resolvedPath) || '.';
      },relative:function(from, to) {
        from = PATH_FS.resolve(from).substr(1);
        to = PATH_FS.resolve(to).substr(1);
        function trim(arr) {
          var start = 0;
          for (; start < arr.length; start++) {
            if (arr[start] !== '') break;
          }
          var end = arr.length - 1;
          for (; end >= 0; end--) {
            if (arr[end] !== '') break;
          }
          if (start > end) return [];
          return arr.slice(start, end - start + 1);
        }
        var fromParts = trim(from.split('/'));
        var toParts = trim(to.split('/'));
        var length = Math.min(fromParts.length, toParts.length);
        var samePartsLength = length;
        for (var i = 0; i < length; i++) {
          if (fromParts[i] !== toParts[i]) {
            samePartsLength = i;
            break;
          }
        }
        var outputParts = [];
        for (var i = samePartsLength; i < fromParts.length; i++) {
          outputParts.push('..');
        }
        outputParts = outputParts.concat(toParts.slice(samePartsLength));
        return outputParts.join('/');
      }};
  
  var TTY={ttys:[],init:function () {
        // https://github.com/emscripten-core/emscripten/pull/1555
        // if (ENVIRONMENT_IS_NODE) {
        //   // currently, FS.init does not distinguish if process.stdin is a file or TTY
        //   // device, it always assumes it's a TTY device. because of this, we're forcing
        //   // process.stdin to UTF8 encoding to at least make stdin reading compatible
        //   // with text files until FS.init can be refactored.
        //   process['stdin']['setEncoding']('utf8');
        // }
      },shutdown:function() {
        // https://github.com/emscripten-core/emscripten/pull/1555
        // if (ENVIRONMENT_IS_NODE) {
        //   // inolen: any idea as to why node -e 'process.stdin.read()' wouldn't exit immediately (with process.stdin being a tty)?
        //   // isaacs: because now it's reading from the stream, you've expressed interest in it, so that read() kicks off a _read() which creates a ReadReq operation
        //   // inolen: I thought read() in that case was a synchronous operation that just grabbed some amount of buffered data if it exists?
        //   // isaacs: it is. but it also triggers a _read() call, which calls readStart() on the handle
        //   // isaacs: do process.stdin.pause() and i'd think it'd probably close the pending call
        //   process['stdin']['pause']();
        // }
      },register:function(dev, ops) {
        TTY.ttys[dev] = { input: [], output: [], ops: ops };
        FS.registerDevice(dev, TTY.stream_ops);
      },stream_ops:{open:function(stream) {
          var tty = TTY.ttys[stream.node.rdev];
          if (!tty) {
            throw new FS.ErrnoError(43);
          }
          stream.tty = tty;
          stream.seekable = false;
        },close:function(stream) {
          // flush any pending line data
          stream.tty.ops.flush(stream.tty);
        },flush:function(stream) {
          stream.tty.ops.flush(stream.tty);
        },read:function(stream, buffer, offset, length, pos /* ignored */) {
          if (!stream.tty || !stream.tty.ops.get_char) {
            throw new FS.ErrnoError(60);
          }
          var bytesRead = 0;
          for (var i = 0; i < length; i++) {
            var result;
            try {
              result = stream.tty.ops.get_char(stream.tty);
            } catch (e) {
              throw new FS.ErrnoError(29);
            }
            if (result === undefined && bytesRead === 0) {
              throw new FS.ErrnoError(6);
            }
            if (result === null || result === undefined) break;
            bytesRead++;
            buffer[offset+i] = result;
          }
          if (bytesRead) {
            stream.node.timestamp = Date.now();
          }
          return bytesRead;
        },write:function(stream, buffer, offset, length, pos) {
          if (!stream.tty || !stream.tty.ops.put_char) {
            throw new FS.ErrnoError(60);
          }
          try {
            for (var i = 0; i < length; i++) {
              stream.tty.ops.put_char(stream.tty, buffer[offset+i]);
            }
          } catch (e) {
            throw new FS.ErrnoError(29);
          }
          if (length) {
            stream.node.timestamp = Date.now();
          }
          return i;
        }},default_tty_ops:{get_char:function(tty) {
          if (!tty.input.length) {
            var result = null;
            if (ENVIRONMENT_IS_NODE) {
              // we will read data by chunks of BUFSIZE
              var BUFSIZE = 256;
              var buf = Buffer.alloc ? Buffer.alloc(BUFSIZE) : new Buffer(BUFSIZE);
              var bytesRead = 0;
  
              try {
                bytesRead = nodeFS.readSync(process.stdin.fd, buf, 0, BUFSIZE, null);
              } catch(e) {
                // Cross-platform differences: on Windows, reading EOF throws an exception, but on other OSes,
                // reading EOF returns 0. Uniformize behavior by treating the EOF exception to return 0.
                if (e.toString().includes('EOF')) bytesRead = 0;
                else throw e;
              }
  
              if (bytesRead > 0) {
                result = buf.slice(0, bytesRead).toString('utf-8');
              } else {
                result = null;
              }
            } else
            if (typeof window != 'undefined' &&
              typeof window.prompt == 'function') {
              // Browser.
              result = window.prompt('Input: ');  // returns null on cancel
              if (result !== null) {
                result += '\n';
              }
            } else if (typeof readline == 'function') {
              // Command line.
              result = readline();
              if (result !== null) {
                result += '\n';
              }
            }
            if (!result) {
              return null;
            }
            tty.input = intArrayFromString(result, true);
          }
          return tty.input.shift();
        },put_char:function(tty, val) {
          if (val === null || val === 10) {
            out(UTF8ArrayToString(tty.output, 0));
            tty.output = [];
          } else {
            if (val != 0) tty.output.push(val); // val == 0 would cut text output off in the middle.
          }
        },flush:function(tty) {
          if (tty.output && tty.output.length > 0) {
            out(UTF8ArrayToString(tty.output, 0));
            tty.output = [];
          }
        }},default_tty1_ops:{put_char:function(tty, val) {
          if (val === null || val === 10) {
            err(UTF8ArrayToString(tty.output, 0));
            tty.output = [];
          } else {
            if (val != 0) tty.output.push(val);
          }
        },flush:function(tty) {
          if (tty.output && tty.output.length > 0) {
            err(UTF8ArrayToString(tty.output, 0));
            tty.output = [];
          }
        }}};
  
  function mmapAlloc(size) {
      var alignedSize = alignMemory(size, 65536);
      var ptr = _malloc(alignedSize);
      while (size < alignedSize) HEAP8[ptr + size++] = 0;
      return ptr;
    }
  var MEMFS={ops_table:null,mount:function(mount) {
        return MEMFS.createNode(null, '/', 16384 | 511 /* 0777 */, 0);
      },createNode:function(parent, name, mode, dev) {
        if (FS.isBlkdev(mode) || FS.isFIFO(mode)) {
          // no supported
          throw new FS.ErrnoError(63);
        }
        if (!MEMFS.ops_table) {
          MEMFS.ops_table = {
            dir: {
              node: {
                getattr: MEMFS.node_ops.getattr,
                setattr: MEMFS.node_ops.setattr,
                lookup: MEMFS.node_ops.lookup,
                mknod: MEMFS.node_ops.mknod,
                rename: MEMFS.node_ops.rename,
                unlink: MEMFS.node_ops.unlink,
                rmdir: MEMFS.node_ops.rmdir,
                readdir: MEMFS.node_ops.readdir,
                symlink: MEMFS.node_ops.symlink
              },
              stream: {
                llseek: MEMFS.stream_ops.llseek
              }
            },
            file: {
              node: {
                getattr: MEMFS.node_ops.getattr,
                setattr: MEMFS.node_ops.setattr
              },
              stream: {
                llseek: MEMFS.stream_ops.llseek,
                read: MEMFS.stream_ops.read,
                write: MEMFS.stream_ops.write,
                allocate: MEMFS.stream_ops.allocate,
                mmap: MEMFS.stream_ops.mmap,
                msync: MEMFS.stream_ops.msync
              }
            },
            link: {
              node: {
                getattr: MEMFS.node_ops.getattr,
                setattr: MEMFS.node_ops.setattr,
                readlink: MEMFS.node_ops.readlink
              },
              stream: {}
            },
            chrdev: {
              node: {
                getattr: MEMFS.node_ops.getattr,
                setattr: MEMFS.node_ops.setattr
              },
              stream: FS.chrdev_stream_ops
            }
          };
        }
        var node = FS.createNode(parent, name, mode, dev);
        if (FS.isDir(node.mode)) {
          node.node_ops = MEMFS.ops_table.dir.node;
          node.stream_ops = MEMFS.ops_table.dir.stream;
          node.contents = {};
        } else if (FS.isFile(node.mode)) {
          node.node_ops = MEMFS.ops_table.file.node;
          node.stream_ops = MEMFS.ops_table.file.stream;
          node.usedBytes = 0; // The actual number of bytes used in the typed array, as opposed to contents.length which gives the whole capacity.
          // When the byte data of the file is populated, this will point to either a typed array, or a normal JS array. Typed arrays are preferred
          // for performance, and used by default. However, typed arrays are not resizable like normal JS arrays are, so there is a small disk size
          // penalty involved for appending file writes that continuously grow a file similar to std::vector capacity vs used -scheme.
          node.contents = null; 
        } else if (FS.isLink(node.mode)) {
          node.node_ops = MEMFS.ops_table.link.node;
          node.stream_ops = MEMFS.ops_table.link.stream;
        } else if (FS.isChrdev(node.mode)) {
          node.node_ops = MEMFS.ops_table.chrdev.node;
          node.stream_ops = MEMFS.ops_table.chrdev.stream;
        }
        node.timestamp = Date.now();
        // add the new node to the parent
        if (parent) {
          parent.contents[name] = node;
          parent.timestamp = node.timestamp;
        }
        return node;
      },getFileDataAsTypedArray:function(node) {
        if (!node.contents) return new Uint8Array(0);
        if (node.contents.subarray) return node.contents.subarray(0, node.usedBytes); // Make sure to not return excess unused bytes.
        return new Uint8Array(node.contents);
      },expandFileStorage:function(node, newCapacity) {
        var prevCapacity = node.contents ? node.contents.length : 0;
        if (prevCapacity >= newCapacity) return; // No need to expand, the storage was already large enough.
        // Don't expand strictly to the given requested limit if it's only a very small increase, but instead geometrically grow capacity.
        // For small filesizes (<1MB), perform size*2 geometric increase, but for large sizes, do a much more conservative size*1.125 increase to
        // avoid overshooting the allocation cap by a very large margin.
        var CAPACITY_DOUBLING_MAX = 1024 * 1024;
        newCapacity = Math.max(newCapacity, (prevCapacity * (prevCapacity < CAPACITY_DOUBLING_MAX ? 2.0 : 1.125)) >>> 0);
        if (prevCapacity != 0) newCapacity = Math.max(newCapacity, 256); // At minimum allocate 256b for each file when expanding.
        var oldContents = node.contents;
        node.contents = new Uint8Array(newCapacity); // Allocate new storage.
        if (node.usedBytes > 0) node.contents.set(oldContents.subarray(0, node.usedBytes), 0); // Copy old data over to the new storage.
      },resizeFileStorage:function(node, newSize) {
        if (node.usedBytes == newSize) return;
        if (newSize == 0) {
          node.contents = null; // Fully decommit when requesting a resize to zero.
          node.usedBytes = 0;
        } else {
          var oldContents = node.contents;
          node.contents = new Uint8Array(newSize); // Allocate new storage.
          if (oldContents) {
            node.contents.set(oldContents.subarray(0, Math.min(newSize, node.usedBytes))); // Copy old data over to the new storage.
          }
          node.usedBytes = newSize;
        }
      },node_ops:{getattr:function(node) {
          var attr = {};
          // device numbers reuse inode numbers.
          attr.dev = FS.isChrdev(node.mode) ? node.id : 1;
          attr.ino = node.id;
          attr.mode = node.mode;
          attr.nlink = 1;
          attr.uid = 0;
          attr.gid = 0;
          attr.rdev = node.rdev;
          if (FS.isDir(node.mode)) {
            attr.size = 4096;
          } else if (FS.isFile(node.mode)) {
            attr.size = node.usedBytes;
          } else if (FS.isLink(node.mode)) {
            attr.size = node.link.length;
          } else {
            attr.size = 0;
          }
          attr.atime = new Date(node.timestamp);
          attr.mtime = new Date(node.timestamp);
          attr.ctime = new Date(node.timestamp);
          // NOTE: In our implementation, st_blocks = Math.ceil(st_size/st_blksize),
          //       but this is not required by the standard.
          attr.blksize = 4096;
          attr.blocks = Math.ceil(attr.size / attr.blksize);
          return attr;
        },setattr:function(node, attr) {
          if (attr.mode !== undefined) {
            node.mode = attr.mode;
          }
          if (attr.timestamp !== undefined) {
            node.timestamp = attr.timestamp;
          }
          if (attr.size !== undefined) {
            MEMFS.resizeFileStorage(node, attr.size);
          }
        },lookup:function(parent, name) {
          throw FS.genericErrors[44];
        },mknod:function(parent, name, mode, dev) {
          return MEMFS.createNode(parent, name, mode, dev);
        },rename:function(old_node, new_dir, new_name) {
          // if we're overwriting a directory at new_name, make sure it's empty.
          if (FS.isDir(old_node.mode)) {
            var new_node;
            try {
              new_node = FS.lookupNode(new_dir, new_name);
            } catch (e) {
            }
            if (new_node) {
              for (var i in new_node.contents) {
                throw new FS.ErrnoError(55);
              }
            }
          }
          // do the internal rewiring
          delete old_node.parent.contents[old_node.name];
          old_node.parent.timestamp = Date.now()
          old_node.name = new_name;
          new_dir.contents[new_name] = old_node;
          new_dir.timestamp = old_node.parent.timestamp;
          old_node.parent = new_dir;
        },unlink:function(parent, name) {
          delete parent.contents[name];
          parent.timestamp = Date.now();
        },rmdir:function(parent, name) {
          var node = FS.lookupNode(parent, name);
          for (var i in node.contents) {
            throw new FS.ErrnoError(55);
          }
          delete parent.contents[name];
          parent.timestamp = Date.now();
        },readdir:function(node) {
          var entries = ['.', '..'];
          for (var key in node.contents) {
            if (!node.contents.hasOwnProperty(key)) {
              continue;
            }
            entries.push(key);
          }
          return entries;
        },symlink:function(parent, newname, oldpath) {
          var node = MEMFS.createNode(parent, newname, 511 /* 0777 */ | 40960, 0);
          node.link = oldpath;
          return node;
        },readlink:function(node) {
          if (!FS.isLink(node.mode)) {
            throw new FS.ErrnoError(28);
          }
          return node.link;
        }},stream_ops:{read:function(stream, buffer, offset, length, position) {
          var contents = stream.node.contents;
          if (position >= stream.node.usedBytes) return 0;
          var size = Math.min(stream.node.usedBytes - position, length);
          assert(size >= 0);
          if (size > 8 && contents.subarray) { // non-trivial, and typed array
            buffer.set(contents.subarray(position, position + size), offset);
          } else {
            for (var i = 0; i < size; i++) buffer[offset + i] = contents[position + i];
          }
          return size;
        },write:function(stream, buffer, offset, length, position, canOwn) {
          // The data buffer should be a typed array view
          assert(!(buffer instanceof ArrayBuffer));
  
          if (!length) return 0;
          var node = stream.node;
          node.timestamp = Date.now();
  
          if (buffer.subarray && (!node.contents || node.contents.subarray)) { // This write is from a typed array to a typed array?
            if (canOwn) {
              assert(position === 0, 'canOwn must imply no weird position inside the file');
              node.contents = buffer.subarray(offset, offset + length);
              node.usedBytes = length;
              return length;
            } else if (node.usedBytes === 0 && position === 0) { // If this is a simple first write to an empty file, do a fast set since we don't need to care about old data.
              node.contents = buffer.slice(offset, offset + length);
              node.usedBytes = length;
              return length;
            } else if (position + length <= node.usedBytes) { // Writing to an already allocated and used subrange of the file?
              node.contents.set(buffer.subarray(offset, offset + length), position);
              return length;
            }
          }
  
          // Appending to an existing file and we need to reallocate, or source data did not come as a typed array.
          MEMFS.expandFileStorage(node, position+length);
          if (node.contents.subarray && buffer.subarray) {
            // Use typed array write which is available.
            node.contents.set(buffer.subarray(offset, offset + length), position);
          } else {
            for (var i = 0; i < length; i++) {
             node.contents[position + i] = buffer[offset + i]; // Or fall back to manual write if not.
            }
          }
          node.usedBytes = Math.max(node.usedBytes, position + length);
          return length;
        },llseek:function(stream, offset, whence) {
          var position = offset;
          if (whence === 1) {
            position += stream.position;
          } else if (whence === 2) {
            if (FS.isFile(stream.node.mode)) {
              position += stream.node.usedBytes;
            }
          }
          if (position < 0) {
            throw new FS.ErrnoError(28);
          }
          return position;
        },allocate:function(stream, offset, length) {
          MEMFS.expandFileStorage(stream.node, offset + length);
          stream.node.usedBytes = Math.max(stream.node.usedBytes, offset + length);
        },mmap:function(stream, address, length, position, prot, flags) {
          if (address !== 0) {
            // We don't currently support location hints for the address of the mapping
            throw new FS.ErrnoError(28);
          }
          if (!FS.isFile(stream.node.mode)) {
            throw new FS.ErrnoError(43);
          }
          var ptr;
          var allocated;
          var contents = stream.node.contents;
          // Only make a new copy when MAP_PRIVATE is specified.
          if (!(flags & 2) && contents.buffer === buffer) {
            // We can't emulate MAP_SHARED when the file is not backed by the buffer
            // we're mapping to (e.g. the HEAP buffer).
            allocated = false;
            ptr = contents.byteOffset;
          } else {
            // Try to avoid unnecessary slices.
            if (position > 0 || position + length < contents.length) {
              if (contents.subarray) {
                contents = contents.subarray(position, position + length);
              } else {
                contents = Array.prototype.slice.call(contents, position, position + length);
              }
            }
            allocated = true;
            ptr = mmapAlloc(length);
            if (!ptr) {
              throw new FS.ErrnoError(48);
            }
            HEAP8.set(contents, ptr);
          }
          return { ptr: ptr, allocated: allocated };
        },msync:function(stream, buffer, offset, length, mmapFlags) {
          if (!FS.isFile(stream.node.mode)) {
            throw new FS.ErrnoError(43);
          }
          if (mmapFlags & 2) {
            // MAP_PRIVATE calls need not to be synced back to underlying fs
            return 0;
          }
  
          var bytesWritten = MEMFS.stream_ops.write(stream, buffer, 0, length, offset, false);
          // should we check if bytesWritten and length are the same?
          return 0;
        }}};
  
  var ERRNO_MESSAGES={0:"Success",1:"Arg list too long",2:"Permission denied",3:"Address already in use",4:"Address not available",5:"Address family not supported by protocol family",6:"No more processes",7:"Socket already connected",8:"Bad file number",9:"Trying to read unreadable message",10:"Mount device busy",11:"Operation canceled",12:"No children",13:"Connection aborted",14:"Connection refused",15:"Connection reset by peer",16:"File locking deadlock error",17:"Destination address required",18:"Math arg out of domain of func",19:"Quota exceeded",20:"File exists",21:"Bad address",22:"File too large",23:"Host is unreachable",24:"Identifier removed",25:"Illegal byte sequence",26:"Connection already in progress",27:"Interrupted system call",28:"Invalid argument",29:"I/O error",30:"Socket is already connected",31:"Is a directory",32:"Too many symbolic links",33:"Too many open files",34:"Too many links",35:"Message too long",36:"Multihop attempted",37:"File or path name too long",38:"Network interface is not configured",39:"Connection reset by network",40:"Network is unreachable",41:"Too many open files in system",42:"No buffer space available",43:"No such device",44:"No such file or directory",45:"Exec format error",46:"No record locks available",47:"The link has been severed",48:"Not enough core",49:"No message of desired type",50:"Protocol not available",51:"No space left on device",52:"Function not implemented",53:"Socket is not connected",54:"Not a directory",55:"Directory not empty",56:"State not recoverable",57:"Socket operation on non-socket",59:"Not a typewriter",60:"No such device or address",61:"Value too large for defined data type",62:"Previous owner died",63:"Not super-user",64:"Broken pipe",65:"Protocol error",66:"Unknown protocol",67:"Protocol wrong type for socket",68:"Math result not representable",69:"Read only file system",70:"Illegal seek",71:"No such process",72:"Stale file handle",73:"Connection timed out",74:"Text file busy",75:"Cross-device link",100:"Device not a stream",101:"Bad font file fmt",102:"Invalid slot",103:"Invalid request code",104:"No anode",105:"Block device required",106:"Channel number out of range",107:"Level 3 halted",108:"Level 3 reset",109:"Link number out of range",110:"Protocol driver not attached",111:"No CSI structure available",112:"Level 2 halted",113:"Invalid exchange",114:"Invalid request descriptor",115:"Exchange full",116:"No data (for no delay io)",117:"Timer expired",118:"Out of streams resources",119:"Machine is not on the network",120:"Package not installed",121:"The object is remote",122:"Advertise error",123:"Srmount error",124:"Communication error on send",125:"Cross mount point (not really error)",126:"Given log. name not unique",127:"f.d. invalid for this operation",128:"Remote address changed",129:"Can   access a needed shared lib",130:"Accessing a corrupted shared lib",131:".lib section in a.out corrupted",132:"Attempting to link in too many libs",133:"Attempting to exec a shared library",135:"Streams pipe error",136:"Too many users",137:"Socket type not supported",138:"Not supported",139:"Protocol family not supported",140:"Can't send after socket shutdown",141:"Too many references",142:"Host is down",148:"No medium (in tape drive)",156:"Level 2 not synchronized"};
  
  var ERRNO_CODES={EPERM:63,ENOENT:44,ESRCH:71,EINTR:27,EIO:29,ENXIO:60,E2BIG:1,ENOEXEC:45,EBADF:8,ECHILD:12,EAGAIN:6,EWOULDBLOCK:6,ENOMEM:48,EACCES:2,EFAULT:21,ENOTBLK:105,EBUSY:10,EEXIST:20,EXDEV:75,ENODEV:43,ENOTDIR:54,EISDIR:31,EINVAL:28,ENFILE:41,EMFILE:33,ENOTTY:59,ETXTBSY:74,EFBIG:22,ENOSPC:51,ESPIPE:70,EROFS:69,EMLINK:34,EPIPE:64,EDOM:18,ERANGE:68,ENOMSG:49,EIDRM:24,ECHRNG:106,EL2NSYNC:156,EL3HLT:107,EL3RST:108,ELNRNG:109,EUNATCH:110,ENOCSI:111,EL2HLT:112,EDEADLK:16,ENOLCK:46,EBADE:113,EBADR:114,EXFULL:115,ENOANO:104,EBADRQC:103,EBADSLT:102,EDEADLOCK:16,EBFONT:101,ENOSTR:100,ENODATA:116,ETIME:117,ENOSR:118,ENONET:119,ENOPKG:120,EREMOTE:121,ENOLINK:47,EADV:122,ESRMNT:123,ECOMM:124,EPROTO:65,EMULTIHOP:36,EDOTDOT:125,EBADMSG:9,ENOTUNIQ:126,EBADFD:127,EREMCHG:128,ELIBACC:129,ELIBBAD:130,ELIBSCN:131,ELIBMAX:132,ELIBEXEC:133,ENOSYS:52,ENOTEMPTY:55,ENAMETOOLONG:37,ELOOP:32,EOPNOTSUPP:138,EPFNOSUPPORT:139,ECONNRESET:15,ENOBUFS:42,EAFNOSUPPORT:5,EPROTOTYPE:67,ENOTSOCK:57,ENOPROTOOPT:50,ESHUTDOWN:140,ECONNREFUSED:14,EADDRINUSE:3,ECONNABORTED:13,ENETUNREACH:40,ENETDOWN:38,ETIMEDOUT:73,EHOSTDOWN:142,EHOSTUNREACH:23,EINPROGRESS:26,EALREADY:7,EDESTADDRREQ:17,EMSGSIZE:35,EPROTONOSUPPORT:66,ESOCKTNOSUPPORT:137,EADDRNOTAVAIL:4,ENETRESET:39,EISCONN:30,ENOTCONN:53,ETOOMANYREFS:141,EUSERS:136,EDQUOT:19,ESTALE:72,ENOTSUP:138,ENOMEDIUM:148,EILSEQ:25,EOVERFLOW:61,ECANCELED:11,ENOTRECOVERABLE:56,EOWNERDEAD:62,ESTRPIPE:135};
  var FS={root:null,mounts:[],devices:{},streams:[],nextInode:1,nameTable:null,currentPath:"/",initialized:false,ignorePermissions:true,trackingDelegate:{},tracking:{openFlags:{READ:1,WRITE:2}},ErrnoError:null,genericErrors:{},filesystems:null,syncFSRequests:0,lookupPath:function(path, opts) {
        path = PATH_FS.resolve(FS.cwd(), path);
        opts = opts || {};
  
        if (!path) return { path: '', node: null };
  
        var defaults = {
          follow_mount: true,
          recurse_count: 0
        };
        for (var key in defaults) {
          if (opts[key] === undefined) {
            opts[key] = defaults[key];
          }
        }
  
        if (opts.recurse_count > 8) {  // max recursive lookup of 8
          throw new FS.ErrnoError(32);
        }
  
        // split the path
        var parts = PATH.normalizeArray(path.split('/').filter(function(p) {
          return !!p;
        }), false);
  
        // start at the root
        var current = FS.root;
        var current_path = '/';
  
        for (var i = 0; i < parts.length; i++) {
          var islast = (i === parts.length-1);
          if (islast && opts.parent) {
            // stop resolving
            break;
          }
  
          current = FS.lookupNode(current, parts[i]);
          current_path = PATH.join2(current_path, parts[i]);
  
          // jump to the mount's root node if this is a mountpoint
          if (FS.isMountpoint(current)) {
            if (!islast || (islast && opts.follow_mount)) {
              current = current.mounted.root;
            }
          }
  
          // by default, lookupPath will not follow a symlink if it is the final path component.
          // setting opts.follow = true will override this behavior.
          if (!islast || opts.follow) {
            var count = 0;
            while (FS.isLink(current.mode)) {
              var link = FS.readlink(current_path);
              current_path = PATH_FS.resolve(PATH.dirname(current_path), link);
  
              var lookup = FS.lookupPath(current_path, { recurse_count: opts.recurse_count });
              current = lookup.node;
  
              if (count++ > 40) {  // limit max consecutive symlinks to 40 (SYMLOOP_MAX).
                throw new FS.ErrnoError(32);
              }
            }
          }
        }
  
        return { path: current_path, node: current };
      },getPath:function(node) {
        var path;
        while (true) {
          if (FS.isRoot(node)) {
            var mount = node.mount.mountpoint;
            if (!path) return mount;
            return mount[mount.length-1] !== '/' ? mount + '/' + path : mount + path;
          }
          path = path ? node.name + '/' + path : node.name;
          node = node.parent;
        }
      },hashName:function(parentid, name) {
        var hash = 0;
  
        for (var i = 0; i < name.length; i++) {
          hash = ((hash << 5) - hash + name.charCodeAt(i)) | 0;
        }
        return ((parentid + hash) >>> 0) % FS.nameTable.length;
      },hashAddNode:function(node) {
        var hash = FS.hashName(node.parent.id, node.name);
        node.name_next = FS.nameTable[hash];
        FS.nameTable[hash] = node;
      },hashRemoveNode:function(node) {
        var hash = FS.hashName(node.parent.id, node.name);
        if (FS.nameTable[hash] === node) {
          FS.nameTable[hash] = node.name_next;
        } else {
          var current = FS.nameTable[hash];
          while (current) {
            if (current.name_next === node) {
              current.name_next = node.name_next;
              break;
            }
            current = current.name_next;
          }
        }
      },lookupNode:function(parent, name) {
        var errCode = FS.mayLookup(parent);
        if (errCode) {
          throw new FS.ErrnoError(errCode, parent);
        }
        var hash = FS.hashName(parent.id, name);
        for (var node = FS.nameTable[hash]; node; node = node.name_next) {
          var nodeName = node.name;
          if (node.parent.id === parent.id && nodeName === name) {
            return node;
          }
        }
        // if we failed to find it in the cache, call into the VFS
        return FS.lookup(parent, name);
      },createNode:function(parent, name, mode, rdev) {
        assert(typeof parent === 'object')
        var node = new FS.FSNode(parent, name, mode, rdev);
  
        FS.hashAddNode(node);
  
        return node;
      },destroyNode:function(node) {
        FS.hashRemoveNode(node);
      },isRoot:function(node) {
        return node === node.parent;
      },isMountpoint:function(node) {
        return !!node.mounted;
      },isFile:function(mode) {
        return (mode & 61440) === 32768;
      },isDir:function(mode) {
        return (mode & 61440) === 16384;
      },isLink:function(mode) {
        return (mode & 61440) === 40960;
      },isChrdev:function(mode) {
        return (mode & 61440) === 8192;
      },isBlkdev:function(mode) {
        return (mode & 61440) === 24576;
      },isFIFO:function(mode) {
        return (mode & 61440) === 4096;
      },isSocket:function(mode) {
        return (mode & 49152) === 49152;
      },flagModes:{"r":0,"r+":2,"w":577,"w+":578,"a":1089,"a+":1090},modeStringToFlags:function(str) {
        var flags = FS.flagModes[str];
        if (typeof flags === 'undefined') {
          throw new Error('Unknown file open mode: ' + str);
        }
        return flags;
      },flagsToPermissionString:function(flag) {
        var perms = ['r', 'w', 'rw'][flag & 3];
        if ((flag & 512)) {
          perms += 'w';
        }
        return perms;
      },nodePermissions:function(node, perms) {
        if (FS.ignorePermissions) {
          return 0;
        }
        // return 0 if any user, group or owner bits are set.
        if (perms.includes('r') && !(node.mode & 292)) {
          return 2;
        } else if (perms.includes('w') && !(node.mode & 146)) {
          return 2;
        } else if (perms.includes('x') && !(node.mode & 73)) {
          return 2;
        }
        return 0;
      },mayLookup:function(dir) {
        var errCode = FS.nodePermissions(dir, 'x');
        if (errCode) return errCode;
        if (!dir.node_ops.lookup) return 2;
        return 0;
      },mayCreate:function(dir, name) {
        try {
          var node = FS.lookupNode(dir, name);
          return 20;
        } catch (e) {
        }
        return FS.nodePermissions(dir, 'wx');
      },mayDelete:function(dir, name, isdir) {
        var node;
        try {
          node = FS.lookupNode(dir, name);
        } catch (e) {
          return e.errno;
        }
        var errCode = FS.nodePermissions(dir, 'wx');
        if (errCode) {
          return errCode;
        }
        if (isdir) {
          if (!FS.isDir(node.mode)) {
            return 54;
          }
          if (FS.isRoot(node) || FS.getPath(node) === FS.cwd()) {
            return 10;
          }
        } else {
          if (FS.isDir(node.mode)) {
            return 31;
          }
        }
        return 0;
      },mayOpen:function(node, flags) {
        if (!node) {
          return 44;
        }
        if (FS.isLink(node.mode)) {
          return 32;
        } else if (FS.isDir(node.mode)) {
          if (FS.flagsToPermissionString(flags) !== 'r' || // opening for write
              (flags & 512)) { // TODO: check for O_SEARCH? (== search for dir only)
            return 31;
          }
        }
        return FS.nodePermissions(node, FS.flagsToPermissionString(flags));
      },MAX_OPEN_FDS:4096,nextfd:function(fd_start, fd_end) {
        fd_start = fd_start || 0;
        fd_end = fd_end || FS.MAX_OPEN_FDS;
        for (var fd = fd_start; fd <= fd_end; fd++) {
          if (!FS.streams[fd]) {
            return fd;
          }
        }
        throw new FS.ErrnoError(33);
      },getStream:function(fd) {
        return FS.streams[fd];
      },createStream:function(stream, fd_start, fd_end) {
        if (!FS.FSStream) {
          FS.FSStream = /** @constructor */ function(){};
          FS.FSStream.prototype = {
            object: {
              get: function() { return this.node; },
              set: function(val) { this.node = val; }
            },
            isRead: {
              get: function() { return (this.flags & 2097155) !== 1; }
            },
            isWrite: {
              get: function() { return (this.flags & 2097155) !== 0; }
            },
            isAppend: {
              get: function() { return (this.flags & 1024); }
            }
          };
        }
        // clone it, so we can return an instance of FSStream
        var newStream = new FS.FSStream();
        for (var p in stream) {
          newStream[p] = stream[p];
        }
        stream = newStream;
        var fd = FS.nextfd(fd_start, fd_end);
        stream.fd = fd;
        FS.streams[fd] = stream;
        return stream;
      },closeStream:function(fd) {
        FS.streams[fd] = null;
      },chrdev_stream_ops:{open:function(stream) {
          var device = FS.getDevice(stream.node.rdev);
          // override node's stream ops with the device's
          stream.stream_ops = device.stream_ops;
          // forward the open call
          if (stream.stream_ops.open) {
            stream.stream_ops.open(stream);
          }
        },llseek:function() {
          throw new FS.ErrnoError(70);
        }},major:function(dev) {
        return ((dev) >> 8);
      },minor:function(dev) {
        return ((dev) & 0xff);
      },makedev:function(ma, mi) {
        return ((ma) << 8 | (mi));
      },registerDevice:function(dev, ops) {
        FS.devices[dev] = { stream_ops: ops };
      },getDevice:function(dev) {
        return FS.devices[dev];
      },getMounts:function(mount) {
        var mounts = [];
        var check = [mount];
  
        while (check.length) {
          var m = check.pop();
  
          mounts.push(m);
  
          check.push.apply(check, m.mounts);
        }
  
        return mounts;
      },syncfs:function(populate, callback) {
        if (typeof(populate) === 'function') {
          callback = populate;
          populate = false;
        }
  
        FS.syncFSRequests++;
  
        if (FS.syncFSRequests > 1) {
          err('warning: ' + FS.syncFSRequests + ' FS.syncfs operations in flight at once, probably just doing extra work');
        }
  
        var mounts = FS.getMounts(FS.root.mount);
        var completed = 0;
  
        function doCallback(errCode) {
          assert(FS.syncFSRequests > 0);
          FS.syncFSRequests--;
          return callback(errCode);
        }
  
        function done(errCode) {
          if (errCode) {
            if (!done.errored) {
              done.errored = true;
              return doCallback(errCode);
            }
            return;
          }
          if (++completed >= mounts.length) {
            doCallback(null);
          }
        };
  
        // sync all mounts
        mounts.forEach(function (mount) {
          if (!mount.type.syncfs) {
            return done(null);
          }
          mount.type.syncfs(mount, populate, done);
        });
      },mount:function(type, opts, mountpoint) {
        if (typeof type === 'string') {
          // The filesystem was not included, and instead we have an error
          // message stored in the variable.
          throw type;
        }
        var root = mountpoint === '/';
        var pseudo = !mountpoint;
        var node;
  
        if (root && FS.root) {
          throw new FS.ErrnoError(10);
        } else if (!root && !pseudo) {
          var lookup = FS.lookupPath(mountpoint, { follow_mount: false });
  
          mountpoint = lookup.path;  // use the absolute path
          node = lookup.node;
  
          if (FS.isMountpoint(node)) {
            throw new FS.ErrnoError(10);
          }
  
          if (!FS.isDir(node.mode)) {
            throw new FS.ErrnoError(54);
          }
        }
  
        var mount = {
          type: type,
          opts: opts,
          mountpoint: mountpoint,
          mounts: []
        };
  
        // create a root node for the fs
        var mountRoot = type.mount(mount);
        mountRoot.mount = mount;
        mount.root = mountRoot;
  
        if (root) {
          FS.root = mountRoot;
        } else if (node) {
          // set as a mountpoint
          node.mounted = mount;
  
          // add the new mount to the current mount's children
          if (node.mount) {
            node.mount.mounts.push(mount);
          }
        }
  
        return mountRoot;
      },unmount:function (mountpoint) {
        var lookup = FS.lookupPath(mountpoint, { follow_mount: false });
  
        if (!FS.isMountpoint(lookup.node)) {
          throw new FS.ErrnoError(28);
        }
  
        // destroy the nodes for this mount, and all its child mounts
        var node = lookup.node;
        var mount = node.mounted;
        var mounts = FS.getMounts(mount);
  
        Object.keys(FS.nameTable).forEach(function (hash) {
          var current = FS.nameTable[hash];
  
          while (current) {
            var next = current.name_next;
  
            if (mounts.includes(current.mount)) {
              FS.destroyNode(current);
            }
  
            current = next;
          }
        });
  
        // no longer a mountpoint
        node.mounted = null;
  
        // remove this mount from the child mounts
        var idx = node.mount.mounts.indexOf(mount);
        assert(idx !== -1);
        node.mount.mounts.splice(idx, 1);
      },lookup:function(parent, name) {
        return parent.node_ops.lookup(parent, name);
      },mknod:function(path, mode, dev) {
        var lookup = FS.lookupPath(path, { parent: true });
        var parent = lookup.node;
        var name = PATH.basename(path);
        if (!name || name === '.' || name === '..') {
          throw new FS.ErrnoError(28);
        }
        var errCode = FS.mayCreate(parent, name);
        if (errCode) {
          throw new FS.ErrnoError(errCode);
        }
        if (!parent.node_ops.mknod) {
          throw new FS.ErrnoError(63);
        }
        return parent.node_ops.mknod(parent, name, mode, dev);
      },create:function(path, mode) {
        mode = mode !== undefined ? mode : 438 /* 0666 */;
        mode &= 4095;
        mode |= 32768;
        return FS.mknod(path, mode, 0);
      },mkdir:function(path, mode) {
        mode = mode !== undefined ? mode : 511 /* 0777 */;
        mode &= 511 | 512;
        mode |= 16384;
        return FS.mknod(path, mode, 0);
      },mkdirTree:function(path, mode) {
        var dirs = path.split('/');
        var d = '';
        for (var i = 0; i < dirs.length; ++i) {
          if (!dirs[i]) continue;
          d += '/' + dirs[i];
          try {
            FS.mkdir(d, mode);
          } catch(e) {
            if (e.errno != 20) throw e;
          }
        }
      },mkdev:function(path, mode, dev) {
        if (typeof(dev) === 'undefined') {
          dev = mode;
          mode = 438 /* 0666 */;
        }
        mode |= 8192;
        return FS.mknod(path, mode, dev);
      },symlink:function(oldpath, newpath) {
        if (!PATH_FS.resolve(oldpath)) {
          throw new FS.ErrnoError(44);
        }
        var lookup = FS.lookupPath(newpath, { parent: true });
        var parent = lookup.node;
        if (!parent) {
          throw new FS.ErrnoError(44);
        }
        var newname = PATH.basename(newpath);
        var errCode = FS.mayCreate(parent, newname);
        if (errCode) {
          throw new FS.ErrnoError(errCode);
        }
        if (!parent.node_ops.symlink) {
          throw new FS.ErrnoError(63);
        }
        return parent.node_ops.symlink(parent, newname, oldpath);
      },rename:function(old_path, new_path) {
        var old_dirname = PATH.dirname(old_path);
        var new_dirname = PATH.dirname(new_path);
        var old_name = PATH.basename(old_path);
        var new_name = PATH.basename(new_path);
        // parents must exist
        var lookup, old_dir, new_dir;
  
        // let the errors from non existant directories percolate up
        lookup = FS.lookupPath(old_path, { parent: true });
        old_dir = lookup.node;
        lookup = FS.lookupPath(new_path, { parent: true });
        new_dir = lookup.node;
  
        if (!old_dir || !new_dir) throw new FS.ErrnoError(44);
        // need to be part of the same mount
        if (old_dir.mount !== new_dir.mount) {
          throw new FS.ErrnoError(75);
        }
        // source must exist
        var old_node = FS.lookupNode(old_dir, old_name);
        // old path should not be an ancestor of the new path
        var relative = PATH_FS.relative(old_path, new_dirname);
        if (relative.charAt(0) !== '.') {
          throw new FS.ErrnoError(28);
        }
        // new path should not be an ancestor of the old path
        relative = PATH_FS.relative(new_path, old_dirname);
        if (relative.charAt(0) !== '.') {
          throw new FS.ErrnoError(55);
        }
        // see if the new path already exists
        var new_node;
        try {
          new_node = FS.lookupNode(new_dir, new_name);
        } catch (e) {
          // not fatal
        }
        // early out if nothing needs to change
        if (old_node === new_node) {
          return;
        }
        // we'll need to delete the old entry
        var isdir = FS.isDir(old_node.mode);
        var errCode = FS.mayDelete(old_dir, old_name, isdir);
        if (errCode) {
          throw new FS.ErrnoError(errCode);
        }
        // need delete permissions if we'll be overwriting.
        // need create permissions if new doesn't already exist.
        errCode = new_node ?
          FS.mayDelete(new_dir, new_name, isdir) :
          FS.mayCreate(new_dir, new_name);
        if (errCode) {
          throw new FS.ErrnoError(errCode);
        }
        if (!old_dir.node_ops.rename) {
          throw new FS.ErrnoError(63);
        }
        if (FS.isMountpoint(old_node) || (new_node && FS.isMountpoint(new_node))) {
          throw new FS.ErrnoError(10);
        }
        // if we are going to change the parent, check write permissions
        if (new_dir !== old_dir) {
          errCode = FS.nodePermissions(old_dir, 'w');
          if (errCode) {
            throw new FS.ErrnoError(errCode);
          }
        }
        try {
          if (FS.trackingDelegate['willMovePath']) {
            FS.trackingDelegate['willMovePath'](old_path, new_path);
          }
        } catch(e) {
          err("FS.trackingDelegate['willMovePath']('"+old_path+"', '"+new_path+"') threw an exception: " + e.message);
        }
        // remove the node from the lookup hash
        FS.hashRemoveNode(old_node);
        // do the underlying fs rename
        try {
          old_dir.node_ops.rename(old_node, new_dir, new_name);
        } catch (e) {
          throw e;
        } finally {
          // add the node back to the hash (in case node_ops.rename
          // changed its name)
          FS.hashAddNode(old_node);
        }
        try {
          if (FS.trackingDelegate['onMovePath']) FS.trackingDelegate['onMovePath'](old_path, new_path);
        } catch(e) {
          err("FS.trackingDelegate['onMovePath']('"+old_path+"', '"+new_path+"') threw an exception: " + e.message);
        }
      },rmdir:function(path) {
        var lookup = FS.lookupPath(path, { parent: true });
        var parent = lookup.node;
        var name = PATH.basename(path);
        var node = FS.lookupNode(parent, name);
        var errCode = FS.mayDelete(parent, name, true);
        if (errCode) {
          throw new FS.ErrnoError(errCode);
        }
        if (!parent.node_ops.rmdir) {
          throw new FS.ErrnoError(63);
        }
        if (FS.isMountpoint(node)) {
          throw new FS.ErrnoError(10);
        }
        try {
          if (FS.trackingDelegate['willDeletePath']) {
            FS.trackingDelegate['willDeletePath'](path);
          }
        } catch(e) {
          err("FS.trackingDelegate['willDeletePath']('"+path+"') threw an exception: " + e.message);
        }
        parent.node_ops.rmdir(parent, name);
        FS.destroyNode(node);
        try {
          if (FS.trackingDelegate['onDeletePath']) FS.trackingDelegate['onDeletePath'](path);
        } catch(e) {
          err("FS.trackingDelegate['onDeletePath']('"+path+"') threw an exception: " + e.message);
        }
      },readdir:function(path) {
        var lookup = FS.lookupPath(path, { follow: true });
        var node = lookup.node;
        if (!node.node_ops.readdir) {
          throw new FS.ErrnoError(54);
        }
        return node.node_ops.readdir(node);
      },unlink:function(path) {
        var lookup = FS.lookupPath(path, { parent: true });
        var parent = lookup.node;
        var name = PATH.basename(path);
        var node = FS.lookupNode(parent, name);
        var errCode = FS.mayDelete(parent, name, false);
        if (errCode) {
          // According to POSIX, we should map EISDIR to EPERM, but
          // we instead do what Linux does (and we must, as we use
          // the musl linux libc).
          throw new FS.ErrnoError(errCode);
        }
        if (!parent.node_ops.unlink) {
          throw new FS.ErrnoError(63);
        }
        if (FS.isMountpoint(node)) {
          throw new FS.ErrnoError(10);
        }
        try {
          if (FS.trackingDelegate['willDeletePath']) {
            FS.trackingDelegate['willDeletePath'](path);
          }
        } catch(e) {
          err("FS.trackingDelegate['willDeletePath']('"+path+"') threw an exception: " + e.message);
        }
        parent.node_ops.unlink(parent, name);
        FS.destroyNode(node);
        try {
          if (FS.trackingDelegate['onDeletePath']) FS.trackingDelegate['onDeletePath'](path);
        } catch(e) {
          err("FS.trackingDelegate['onDeletePath']('"+path+"') threw an exception: " + e.message);
        }
      },readlink:function(path) {
        var lookup = FS.lookupPath(path);
        var link = lookup.node;
        if (!link) {
          throw new FS.ErrnoError(44);
        }
        if (!link.node_ops.readlink) {
          throw new FS.ErrnoError(28);
        }
        return PATH_FS.resolve(FS.getPath(link.parent), link.node_ops.readlink(link));
      },stat:function(path, dontFollow) {
        var lookup = FS.lookupPath(path, { follow: !dontFollow });
        var node = lookup.node;
        if (!node) {
          throw new FS.ErrnoError(44);
        }
        if (!node.node_ops.getattr) {
          throw new FS.ErrnoError(63);
        }
        return node.node_ops.getattr(node);
      },lstat:function(path) {
        return FS.stat(path, true);
      },chmod:function(path, mode, dontFollow) {
        var node;
        if (typeof path === 'string') {
          var lookup = FS.lookupPath(path, { follow: !dontFollow });
          node = lookup.node;
        } else {
          node = path;
        }
        if (!node.node_ops.setattr) {
          throw new FS.ErrnoError(63);
        }
        node.node_ops.setattr(node, {
          mode: (mode & 4095) | (node.mode & ~4095),
          timestamp: Date.now()
        });
      },lchmod:function(path, mode) {
        FS.chmod(path, mode, true);
      },fchmod:function(fd, mode) {
        var stream = FS.getStream(fd);
        if (!stream) {
          throw new FS.ErrnoError(8);
        }
        FS.chmod(stream.node, mode);
      },chown:function(path, uid, gid, dontFollow) {
        var node;
        if (typeof path === 'string') {
          var lookup = FS.lookupPath(path, { follow: !dontFollow });
          node = lookup.node;
        } else {
          node = path;
        }
        if (!node.node_ops.setattr) {
          throw new FS.ErrnoError(63);
        }
        node.node_ops.setattr(node, {
          timestamp: Date.now()
          // we ignore the uid / gid for now
        });
      },lchown:function(path, uid, gid) {
        FS.chown(path, uid, gid, true);
      },fchown:function(fd, uid, gid) {
        var stream = FS.getStream(fd);
        if (!stream) {
          throw new FS.ErrnoError(8);
        }
        FS.chown(stream.node, uid, gid);
      },truncate:function(path, len) {
        if (len < 0) {
          throw new FS.ErrnoError(28);
        }
        var node;
        if (typeof path === 'string') {
          var lookup = FS.lookupPath(path, { follow: true });
          node = lookup.node;
        } else {
          node = path;
        }
        if (!node.node_ops.setattr) {
          throw new FS.ErrnoError(63);
        }
        if (FS.isDir(node.mode)) {
          throw new FS.ErrnoError(31);
        }
        if (!FS.isFile(node.mode)) {
          throw new FS.ErrnoError(28);
        }
        var errCode = FS.nodePermissions(node, 'w');
        if (errCode) {
          throw new FS.ErrnoError(errCode);
        }
        node.node_ops.setattr(node, {
          size: len,
          timestamp: Date.now()
        });
      },ftruncate:function(fd, len) {
        var stream = FS.getStream(fd);
        if (!stream) {
          throw new FS.ErrnoError(8);
        }
        if ((stream.flags & 2097155) === 0) {
          throw new FS.ErrnoError(28);
        }
        FS.truncate(stream.node, len);
      },utime:function(path, atime, mtime) {
        var lookup = FS.lookupPath(path, { follow: true });
        var node = lookup.node;
        node.node_ops.setattr(node, {
          timestamp: Math.max(atime, mtime)
        });
      },open:function(path, flags, mode, fd_start, fd_end) {
        if (path === "") {
          throw new FS.ErrnoError(44);
        }
        flags = typeof flags === 'string' ? FS.modeStringToFlags(flags) : flags;
        mode = typeof mode === 'undefined' ? 438 /* 0666 */ : mode;
        if ((flags & 64)) {
          mode = (mode & 4095) | 32768;
        } else {
          mode = 0;
        }
        var node;
        if (typeof path === 'object') {
          node = path;
        } else {
          path = PATH.normalize(path);
          try {
            var lookup = FS.lookupPath(path, {
              follow: !(flags & 131072)
            });
            node = lookup.node;
          } catch (e) {
            // ignore
          }
        }
        // perhaps we need to create the node
        var created = false;
        if ((flags & 64)) {
          if (node) {
            // if O_CREAT and O_EXCL are set, error out if the node already exists
            if ((flags & 128)) {
              throw new FS.ErrnoError(20);
            }
          } else {
            // node doesn't exist, try to create it
            node = FS.mknod(path, mode, 0);
            created = true;
          }
        }
        if (!node) {
          throw new FS.ErrnoError(44);
        }
        // can't truncate a device
        if (FS.isChrdev(node.mode)) {
          flags &= ~512;
        }
        // if asked only for a directory, then this must be one
        if ((flags & 65536) && !FS.isDir(node.mode)) {
          throw new FS.ErrnoError(54);
        }
        // check permissions, if this is not a file we just created now (it is ok to
        // create and write to a file with read-only permissions; it is read-only
        // for later use)
        if (!created) {
          var errCode = FS.mayOpen(node, flags);
          if (errCode) {
            throw new FS.ErrnoError(errCode);
          }
        }
        // do truncation if necessary
        if ((flags & 512)) {
          FS.truncate(node, 0);
        }
        // we've already handled these, don't pass down to the underlying vfs
        flags &= ~(128 | 512 | 131072);
  
        // register the stream with the filesystem
        var stream = FS.createStream({
          node: node,
          path: FS.getPath(node),  // we want the absolute path to the node
          flags: flags,
          seekable: true,
          position: 0,
          stream_ops: node.stream_ops,
          // used by the file family libc calls (fopen, fwrite, ferror, etc.)
          ungotten: [],
          error: false
        }, fd_start, fd_end);
        // call the new stream's open function
        if (stream.stream_ops.open) {
          stream.stream_ops.open(stream);
        }
        if (Module['logReadFiles'] && !(flags & 1)) {
          if (!FS.readFiles) FS.readFiles = {};
          if (!(path in FS.readFiles)) {
            FS.readFiles[path] = 1;
            err("FS.trackingDelegate error on read file: " + path);
          }
        }
        try {
          if (FS.trackingDelegate['onOpenFile']) {
            var trackingFlags = 0;
            if ((flags & 2097155) !== 1) {
              trackingFlags |= FS.tracking.openFlags.READ;
            }
            if ((flags & 2097155) !== 0) {
              trackingFlags |= FS.tracking.openFlags.WRITE;
            }
            FS.trackingDelegate['onOpenFile'](path, trackingFlags);
          }
        } catch(e) {
          err("FS.trackingDelegate['onOpenFile']('"+path+"', flags) threw an exception: " + e.message);
        }
        return stream;
      },close:function(stream) {
        if (FS.isClosed(stream)) {
          throw new FS.ErrnoError(8);
        }
        if (stream.getdents) stream.getdents = null; // free readdir state
        try {
          if (stream.stream_ops.close) {
            stream.stream_ops.close(stream);
          }
        } catch (e) {
          throw e;
        } finally {
          FS.closeStream(stream.fd);
        }
        stream.fd = null;
      },isClosed:function(stream) {
        return stream.fd === null;
      },llseek:function(stream, offset, whence) {
        if (FS.isClosed(stream)) {
          throw new FS.ErrnoError(8);
        }
        if (!stream.seekable || !stream.stream_ops.llseek) {
          throw new FS.ErrnoError(70);
        }
        if (whence != 0 && whence != 1 && whence != 2) {
          throw new FS.ErrnoError(28);
        }
        stream.position = stream.stream_ops.llseek(stream, offset, whence);
        stream.ungotten = [];
        return stream.position;
      },read:function(stream, buffer, offset, length, position) {
        if (length < 0 || position < 0) {
          throw new FS.ErrnoError(28);
        }
        if (FS.isClosed(stream)) {
          throw new FS.ErrnoError(8);
        }
        if ((stream.flags & 2097155) === 1) {
          throw new FS.ErrnoError(8);
        }
        if (FS.isDir(stream.node.mode)) {
          throw new FS.ErrnoError(31);
        }
        if (!stream.stream_ops.read) {
          throw new FS.ErrnoError(28);
        }
        var seeking = typeof position !== 'undefined';
        if (!seeking) {
          position = stream.position;
        } else if (!stream.seekable) {
          throw new FS.ErrnoError(70);
        }
        var bytesRead = stream.stream_ops.read(stream, buffer, offset, length, position);
        if (!seeking) stream.position += bytesRead;
        return bytesRead;
      },write:function(stream, buffer, offset, length, position, canOwn) {
        if (length < 0 || position < 0) {
          throw new FS.ErrnoError(28);
        }
        if (FS.isClosed(stream)) {
          throw new FS.ErrnoError(8);
        }
        if ((stream.flags & 2097155) === 0) {
          throw new FS.ErrnoError(8);
        }
        if (FS.isDir(stream.node.mode)) {
          throw new FS.ErrnoError(31);
        }
        if (!stream.stream_ops.write) {
          throw new FS.ErrnoError(28);
        }
        if (stream.seekable && stream.flags & 1024) {
          // seek to the end before writing in append mode
          FS.llseek(stream, 0, 2);
        }
        var seeking = typeof position !== 'undefined';
        if (!seeking) {
          position = stream.position;
        } else if (!stream.seekable) {
          throw new FS.ErrnoError(70);
        }
        var bytesWritten = stream.stream_ops.write(stream, buffer, offset, length, position, canOwn);
        if (!seeking) stream.position += bytesWritten;
        try {
          if (stream.path && FS.trackingDelegate['onWriteToFile']) FS.trackingDelegate['onWriteToFile'](stream.path);
        } catch(e) {
          err("FS.trackingDelegate['onWriteToFile']('"+stream.path+"') threw an exception: " + e.message);
        }
        return bytesWritten;
      },allocate:function(stream, offset, length) {
        if (FS.isClosed(stream)) {
          throw new FS.ErrnoError(8);
        }
        if (offset < 0 || length <= 0) {
          throw new FS.ErrnoError(28);
        }
        if ((stream.flags & 2097155) === 0) {
          throw new FS.ErrnoError(8);
        }
        if (!FS.isFile(stream.node.mode) && !FS.isDir(stream.node.mode)) {
          throw new FS.ErrnoError(43);
        }
        if (!stream.stream_ops.allocate) {
          throw new FS.ErrnoError(138);
        }
        stream.stream_ops.allocate(stream, offset, length);
      },mmap:function(stream, address, length, position, prot, flags) {
        // User requests writing to file (prot & PROT_WRITE != 0).
        // Checking if we have permissions to write to the file unless
        // MAP_PRIVATE flag is set. According to POSIX spec it is possible
        // to write to file opened in read-only mode with MAP_PRIVATE flag,
        // as all modifications will be visible only in the memory of
        // the current process.
        if ((prot & 2) !== 0
            && (flags & 2) === 0
            && (stream.flags & 2097155) !== 2) {
          throw new FS.ErrnoError(2);
        }
        if ((stream.flags & 2097155) === 1) {
          throw new FS.ErrnoError(2);
        }
        if (!stream.stream_ops.mmap) {
          throw new FS.ErrnoError(43);
        }
        return stream.stream_ops.mmap(stream, address, length, position, prot, flags);
      },msync:function(stream, buffer, offset, length, mmapFlags) {
        if (!stream || !stream.stream_ops.msync) {
          return 0;
        }
        return stream.stream_ops.msync(stream, buffer, offset, length, mmapFlags);
      },munmap:function(stream) {
        return 0;
      },ioctl:function(stream, cmd, arg) {
        if (!stream.stream_ops.ioctl) {
          throw new FS.ErrnoError(59);
        }
        return stream.stream_ops.ioctl(stream, cmd, arg);
      },readFile:function(path, opts) {
        opts = opts || {};
        opts.flags = opts.flags || 0;
        opts.encoding = opts.encoding || 'binary';
        if (opts.encoding !== 'utf8' && opts.encoding !== 'binary') {
          throw new Error('Invalid encoding type "' + opts.encoding + '"');
        }
        var ret;
        var stream = FS.open(path, opts.flags);
        var stat = FS.stat(path);
        var length = stat.size;
        var buf = new Uint8Array(length);
        FS.read(stream, buf, 0, length, 0);
        if (opts.encoding === 'utf8') {
          ret = UTF8ArrayToString(buf, 0);
        } else if (opts.encoding === 'binary') {
          ret = buf;
        }
        FS.close(stream);
        return ret;
      },writeFile:function(path, data, opts) {
        opts = opts || {};
        opts.flags = opts.flags || 577;
        var stream = FS.open(path, opts.flags, opts.mode);
        if (typeof data === 'string') {
          var buf = new Uint8Array(lengthBytesUTF8(data)+1);
          var actualNumBytes = stringToUTF8Array(data, buf, 0, buf.length);
          FS.write(stream, buf, 0, actualNumBytes, undefined, opts.canOwn);
        } else if (ArrayBuffer.isView(data)) {
          FS.write(stream, data, 0, data.byteLength, undefined, opts.canOwn);
        } else {
          throw new Error('Unsupported data type');
        }
        FS.close(stream);
      },cwd:function() {
        return FS.currentPath;
      },chdir:function(path) {
        var lookup = FS.lookupPath(path, { follow: true });
        if (lookup.node === null) {
          throw new FS.ErrnoError(44);
        }
        if (!FS.isDir(lookup.node.mode)) {
          throw new FS.ErrnoError(54);
        }
        var errCode = FS.nodePermissions(lookup.node, 'x');
        if (errCode) {
          throw new FS.ErrnoError(errCode);
        }
        FS.currentPath = lookup.path;
      },createDefaultDirectories:function() {
        FS.mkdir('/tmp');
        FS.mkdir('/home');
        FS.mkdir('/home/web_user');
      },createDefaultDevices:function() {
        // create /dev
        FS.mkdir('/dev');
        // setup /dev/null
        FS.registerDevice(FS.makedev(1, 3), {
          read: function() { return 0; },
          write: function(stream, buffer, offset, length, pos) { return length; }
        });
        FS.mkdev('/dev/null', FS.makedev(1, 3));
        // setup /dev/tty and /dev/tty1
        // stderr needs to print output using err() rather than out()
        // so we register a second tty just for it.
        TTY.register(FS.makedev(5, 0), TTY.default_tty_ops);
        TTY.register(FS.makedev(6, 0), TTY.default_tty1_ops);
        FS.mkdev('/dev/tty', FS.makedev(5, 0));
        FS.mkdev('/dev/tty1', FS.makedev(6, 0));
        // setup /dev/[u]random
        var random_device = getRandomDevice();
        FS.createDevice('/dev', 'random', random_device);
        FS.createDevice('/dev', 'urandom', random_device);
        // we're not going to emulate the actual shm device,
        // just create the tmp dirs that reside in it commonly
        FS.mkdir('/dev/shm');
        FS.mkdir('/dev/shm/tmp');
      },createSpecialDirectories:function() {
        // create /proc/self/fd which allows /proc/self/fd/6 => readlink gives the
        // name of the stream for fd 6 (see test_unistd_ttyname)
        FS.mkdir('/proc');
        var proc_self = FS.mkdir('/proc/self');
        FS.mkdir('/proc/self/fd');
        FS.mount({
          mount: function() {
            var node = FS.createNode(proc_self, 'fd', 16384 | 511 /* 0777 */, 73);
            node.node_ops = {
              lookup: function(parent, name) {
                var fd = +name;
                var stream = FS.getStream(fd);
                if (!stream) throw new FS.ErrnoError(8);
                var ret = {
                  parent: null,
                  mount: { mountpoint: 'fake' },
                  node_ops: { readlink: function() { return stream.path } }
                };
                ret.parent = ret; // make it look like a simple root node
                return ret;
              }
            };
            return node;
          }
        }, {}, '/proc/self/fd');
      },createStandardStreams:function() {
        // TODO deprecate the old functionality of a single
        // input / output callback and that utilizes FS.createDevice
        // and instead require a unique set of stream ops
  
        // by default, we symlink the standard streams to the
        // default tty devices. however, if the standard streams
        // have been overwritten we create a unique device for
        // them instead.
        if (Module['stdin']) {
          FS.createDevice('/dev', 'stdin', Module['stdin']);
        } else {
          FS.symlink('/dev/tty', '/dev/stdin');
        }
        if (Module['stdout']) {
          FS.createDevice('/dev', 'stdout', null, Module['stdout']);
        } else {
          FS.symlink('/dev/tty', '/dev/stdout');
        }
        if (Module['stderr']) {
          FS.createDevice('/dev', 'stderr', null, Module['stderr']);
        } else {
          FS.symlink('/dev/tty1', '/dev/stderr');
        }
  
        // open default streams for the stdin, stdout and stderr devices
        var stdin = FS.open('/dev/stdin', 0);
        var stdout = FS.open('/dev/stdout', 1);
        var stderr = FS.open('/dev/stderr', 1);
        assert(stdin.fd === 0, 'invalid handle for stdin (' + stdin.fd + ')');
        assert(stdout.fd === 1, 'invalid handle for stdout (' + stdout.fd + ')');
        assert(stderr.fd === 2, 'invalid handle for stderr (' + stderr.fd + ')');
      },ensureErrnoError:function() {
        if (FS.ErrnoError) return;
        FS.ErrnoError = /** @this{Object} */ function ErrnoError(errno, node) {
          this.node = node;
          this.setErrno = /** @this{Object} */ function(errno) {
            this.errno = errno;
            for (var key in ERRNO_CODES) {
              if (ERRNO_CODES[key] === errno) {
                this.code = key;
                break;
              }
            }
          };
          this.setErrno(errno);
          this.message = ERRNO_MESSAGES[errno];
  
          // Try to get a maximally helpful stack trace. On Node.js, getting Error.stack
          // now ensures it shows what we want.
          if (this.stack) {
            // Define the stack property for Node.js 4, which otherwise errors on the next line.
            Object.defineProperty(this, "stack", { value: (new Error).stack, writable: true });
            this.stack = demangleAll(this.stack);
          }
        };
        FS.ErrnoError.prototype = new Error();
        FS.ErrnoError.prototype.constructor = FS.ErrnoError;
        // Some errors may happen quite a bit, to avoid overhead we reuse them (and suffer a lack of stack info)
        [44].forEach(function(code) {
          FS.genericErrors[code] = new FS.ErrnoError(code);
          FS.genericErrors[code].stack = '<generic error, no stack>';
        });
      },staticInit:function() {
        FS.ensureErrnoError();
  
        FS.nameTable = new Array(4096);
  
        FS.mount(MEMFS, {}, '/');
  
        FS.createDefaultDirectories();
        FS.createDefaultDevices();
        FS.createSpecialDirectories();
  
        FS.filesystems = {
          'MEMFS': MEMFS,
        };
      },init:function(input, output, error) {
        assert(!FS.init.initialized, 'FS.init was previously called. If you want to initialize later with custom parameters, remove any earlier calls (note that one is automatically added to the generated code)');
        FS.init.initialized = true;
  
        FS.ensureErrnoError();
  
        // Allow Module.stdin etc. to provide defaults, if none explicitly passed to us here
        Module['stdin'] = input || Module['stdin'];
        Module['stdout'] = output || Module['stdout'];
        Module['stderr'] = error || Module['stderr'];
  
        FS.createStandardStreams();
      },quit:function() {
        FS.init.initialized = false;
        // force-flush all streams, so we get musl std streams printed out
        var fflush = Module['_fflush'];
        if (fflush) fflush(0);
        // close all of our streams
        for (var i = 0; i < FS.streams.length; i++) {
          var stream = FS.streams[i];
          if (!stream) {
            continue;
          }
          FS.close(stream);
        }
      },getMode:function(canRead, canWrite) {
        var mode = 0;
        if (canRead) mode |= 292 | 73;
        if (canWrite) mode |= 146;
        return mode;
      },findObject:function(path, dontResolveLastLink) {
        var ret = FS.analyzePath(path, dontResolveLastLink);
        if (ret.exists) {
          return ret.object;
        } else {
          return null;
        }
      },analyzePath:function(path, dontResolveLastLink) {
        // operate from within the context of the symlink's target
        try {
          var lookup = FS.lookupPath(path, { follow: !dontResolveLastLink });
          path = lookup.path;
        } catch (e) {
        }
        var ret = {
          isRoot: false, exists: false, error: 0, name: null, path: null, object: null,
          parentExists: false, parentPath: null, parentObject: null
        };
        try {
          var lookup = FS.lookupPath(path, { parent: true });
          ret.parentExists = true;
          ret.parentPath = lookup.path;
          ret.parentObject = lookup.node;
          ret.name = PATH.basename(path);
          lookup = FS.lookupPath(path, { follow: !dontResolveLastLink });
          ret.exists = true;
          ret.path = lookup.path;
          ret.object = lookup.node;
          ret.name = lookup.node.name;
          ret.isRoot = lookup.path === '/';
        } catch (e) {
          ret.error = e.errno;
        };
        return ret;
      },createPath:function(parent, path, canRead, canWrite) {
        parent = typeof parent === 'string' ? parent : FS.getPath(parent);
        var parts = path.split('/').reverse();
        while (parts.length) {
          var part = parts.pop();
          if (!part) continue;
          var current = PATH.join2(parent, part);
          try {
            FS.mkdir(current);
          } catch (e) {
            // ignore EEXIST
          }
          parent = current;
        }
        return current;
      },createFile:function(parent, name, properties, canRead, canWrite) {
        var path = PATH.join2(typeof parent === 'string' ? parent : FS.getPath(parent), name);
        var mode = FS.getMode(canRead, canWrite);
        return FS.create(path, mode);
      },createDataFile:function(parent, name, data, canRead, canWrite, canOwn) {
        var path = name ? PATH.join2(typeof parent === 'string' ? parent : FS.getPath(parent), name) : parent;
        var mode = FS.getMode(canRead, canWrite);
        var node = FS.create(path, mode);
        if (data) {
          if (typeof data === 'string') {
            var arr = new Array(data.length);
            for (var i = 0, len = data.length; i < len; ++i) arr[i] = data.charCodeAt(i);
            data = arr;
          }
          // make sure we can write to the file
          FS.chmod(node, mode | 146);
          var stream = FS.open(node, 577);
          FS.write(stream, data, 0, data.length, 0, canOwn);
          FS.close(stream);
          FS.chmod(node, mode);
        }
        return node;
      },createDevice:function(parent, name, input, output) {
        var path = PATH.join2(typeof parent === 'string' ? parent : FS.getPath(parent), name);
        var mode = FS.getMode(!!input, !!output);
        if (!FS.createDevice.major) FS.createDevice.major = 64;
        var dev = FS.makedev(FS.createDevice.major++, 0);
        // Create a fake device that a set of stream ops to emulate
        // the old behavior.
        FS.registerDevice(dev, {
          open: function(stream) {
            stream.seekable = false;
          },
          close: function(stream) {
            // flush any pending line data
            if (output && output.buffer && output.buffer.length) {
              output(10);
            }
          },
          read: function(stream, buffer, offset, length, pos /* ignored */) {
            var bytesRead = 0;
            for (var i = 0; i < length; i++) {
              var result;
              try {
                result = input();
              } catch (e) {
                throw new FS.ErrnoError(29);
              }
              if (result === undefined && bytesRead === 0) {
                throw new FS.ErrnoError(6);
              }
              if (result === null || result === undefined) break;
              bytesRead++;
              buffer[offset+i] = result;
            }
            if (bytesRead) {
              stream.node.timestamp = Date.now();
            }
            return bytesRead;
          },
          write: function(stream, buffer, offset, length, pos) {
            for (var i = 0; i < length; i++) {
              try {
                output(buffer[offset+i]);
              } catch (e) {
                throw new FS.ErrnoError(29);
              }
            }
            if (length) {
              stream.node.timestamp = Date.now();
            }
            return i;
          }
        });
        return FS.mkdev(path, mode, dev);
      },forceLoadFile:function(obj) {
        if (obj.isDevice || obj.isFolder || obj.link || obj.contents) return true;
        if (typeof XMLHttpRequest !== 'undefined') {
          throw new Error("Lazy loading should have been performed (contents set) in createLazyFile, but it was not. Lazy loading only works in web workers. Use --embed-file or --preload-file in emcc on the main thread.");
        } else if (read_) {
          // Command-line.
          try {
            // WARNING: Can't read binary files in V8's d8 or tracemonkey's js, as
            //          read() will try to parse UTF8.
            obj.contents = intArrayFromString(read_(obj.url), true);
            obj.usedBytes = obj.contents.length;
          } catch (e) {
            throw new FS.ErrnoError(29);
          }
        } else {
          throw new Error('Cannot load without read() or XMLHttpRequest.');
        }
      },createLazyFile:function(parent, name, url, canRead, canWrite) {
        // Lazy chunked Uint8Array (implements get and length from Uint8Array). Actual getting is abstracted away for eventual reuse.
        /** @constructor */
        function LazyUint8Array() {
          this.lengthKnown = false;
          this.chunks = []; // Loaded chunks. Index is the chunk number
        }
        LazyUint8Array.prototype.get = /** @this{Object} */ function LazyUint8Array_get(idx) {
          if (idx > this.length-1 || idx < 0) {
            return undefined;
          }
          var chunkOffset = idx % this.chunkSize;
          var chunkNum = (idx / this.chunkSize)|0;
          return this.getter(chunkNum)[chunkOffset];
        };
        LazyUint8Array.prototype.setDataGetter = function LazyUint8Array_setDataGetter(getter) {
          this.getter = getter;
        };
        LazyUint8Array.prototype.cacheLength = function LazyUint8Array_cacheLength() {
          // Find length
          var xhr = new XMLHttpRequest();
          xhr.open('HEAD', url, false);
          xhr.send(null);
          if (!(xhr.status >= 200 && xhr.status < 300 || xhr.status === 304)) throw new Error("Couldn't load " + url + ". Status: " + xhr.status);
          var datalength = Number(xhr.getResponseHeader("Content-length"));
          var header;
          var hasByteServing = (header = xhr.getResponseHeader("Accept-Ranges")) && header === "bytes";
          var usesGzip = (header = xhr.getResponseHeader("Content-Encoding")) && header === "gzip";
  
          var chunkSize = 1024*1024; // Chunk size in bytes
  
          if (!hasByteServing) chunkSize = datalength;
  
          // Function to get a range from the remote URL.
          var doXHR = (function(from, to) {
            if (from > to) throw new Error("invalid range (" + from + ", " + to + ") or no bytes requested!");
            if (to > datalength-1) throw new Error("only " + datalength + " bytes available! programmer error!");
  
            // TODO: Use mozResponseArrayBuffer, responseStream, etc. if available.
            var xhr = new XMLHttpRequest();
            xhr.open('GET', url, false);
            if (datalength !== chunkSize) xhr.setRequestHeader("Range", "bytes=" + from + "-" + to);
  
            // Some hints to the browser that we want binary data.
            if (typeof Uint8Array != 'undefined') xhr.responseType = 'arraybuffer';
            if (xhr.overrideMimeType) {
              xhr.overrideMimeType('text/plain; charset=x-user-defined');
            }
  
            xhr.send(null);
            if (!(xhr.status >= 200 && xhr.status < 300 || xhr.status === 304)) throw new Error("Couldn't load " + url + ". Status: " + xhr.status);
            if (xhr.response !== undefined) {
              return new Uint8Array(/** @type{Array<number>} */(xhr.response || []));
            } else {
              return intArrayFromString(xhr.responseText || '', true);
            }
          });
          var lazyArray = this;
          lazyArray.setDataGetter(function(chunkNum) {
            var start = chunkNum * chunkSize;
            var end = (chunkNum+1) * chunkSize - 1; // including this byte
            end = Math.min(end, datalength-1); // if datalength-1 is selected, this is the last block
            if (typeof(lazyArray.chunks[chunkNum]) === "undefined") {
              lazyArray.chunks[chunkNum] = doXHR(start, end);
            }
            if (typeof(lazyArray.chunks[chunkNum]) === "undefined") throw new Error("doXHR failed!");
            return lazyArray.chunks[chunkNum];
          });
  
          if (usesGzip || !datalength) {
            // if the server uses gzip or doesn't supply the length, we have to download the whole file to get the (uncompressed) length
            chunkSize = datalength = 1; // this will force getter(0)/doXHR do download the whole file
            datalength = this.getter(0).length;
            chunkSize = datalength;
            out("LazyFiles on gzip forces download of the whole file when length is accessed");
          }
  
          this._length = datalength;
          this._chunkSize = chunkSize;
          this.lengthKnown = true;
        };
        if (typeof XMLHttpRequest !== 'undefined') {
          if (!ENVIRONMENT_IS_WORKER) throw 'Cannot do synchronous binary XHRs outside webworkers in modern browsers. Use --embed-file or --preload-file in emcc';
          var lazyArray = new LazyUint8Array();
          Object.defineProperties(lazyArray, {
            length: {
              get: /** @this{Object} */ function() {
                if (!this.lengthKnown) {
                  this.cacheLength();
                }
                return this._length;
              }
            },
            chunkSize: {
              get: /** @this{Object} */ function() {
                if (!this.lengthKnown) {
                  this.cacheLength();
                }
                return this._chunkSize;
              }
            }
          });
  
          var properties = { isDevice: false, contents: lazyArray };
        } else {
          var properties = { isDevice: false, url: url };
        }
  
        var node = FS.createFile(parent, name, properties, canRead, canWrite);
        // This is a total hack, but I want to get this lazy file code out of the
        // core of MEMFS. If we want to keep this lazy file concept I feel it should
        // be its own thin LAZYFS proxying calls to MEMFS.
        if (properties.contents) {
          node.contents = properties.contents;
        } else if (properties.url) {
          node.contents = null;
          node.url = properties.url;
        }
        // Add a function that defers querying the file size until it is asked the first time.
        Object.defineProperties(node, {
          usedBytes: {
            get: /** @this {FSNode} */ function() { return this.contents.length; }
          }
        });
        // override each stream op with one that tries to force load the lazy file first
        var stream_ops = {};
        var keys = Object.keys(node.stream_ops);
        keys.forEach(function(key) {
          var fn = node.stream_ops[key];
          stream_ops[key] = function forceLoadLazyFile() {
            FS.forceLoadFile(node);
            return fn.apply(null, arguments);
          };
        });
        // use a custom read function
        stream_ops.read = function stream_ops_read(stream, buffer, offset, length, position) {
          FS.forceLoadFile(node);
          var contents = stream.node.contents;
          if (position >= contents.length)
            return 0;
          var size = Math.min(contents.length - position, length);
          assert(size >= 0);
          if (contents.slice) { // normal array
            for (var i = 0; i < size; i++) {
              buffer[offset + i] = contents[position + i];
            }
          } else {
            for (var i = 0; i < size; i++) { // LazyUint8Array from sync binary XHR
              buffer[offset + i] = contents.get(position + i);
            }
          }
          return size;
        };
        node.stream_ops = stream_ops;
        return node;
      },createPreloadedFile:function(parent, name, url, canRead, canWrite, onload, onerror, dontCreateFile, canOwn, preFinish) {
        Browser.init(); // XXX perhaps this method should move onto Browser?
        // TODO we should allow people to just pass in a complete filename instead
        // of parent and name being that we just join them anyways
        var fullname = name ? PATH_FS.resolve(PATH.join2(parent, name)) : parent;
        var dep = getUniqueRunDependency('cp ' + fullname); // might have several active requests for the same fullname
        function processData(byteArray) {
          function finish(byteArray) {
            if (preFinish) preFinish();
            if (!dontCreateFile) {
              FS.createDataFile(parent, name, byteArray, canRead, canWrite, canOwn);
            }
            if (onload) onload();
            removeRunDependency(dep);
          }
          var handled = false;
          Module['preloadPlugins'].forEach(function(plugin) {
            if (handled) return;
            if (plugin['canHandle'](fullname)) {
              plugin['handle'](byteArray, fullname, finish, function() {
                if (onerror) onerror();
                removeRunDependency(dep);
              });
              handled = true;
            }
          });
          if (!handled) finish(byteArray);
        }
        addRunDependency(dep);
        if (typeof url == 'string') {
          Browser.asyncLoad(url, function(byteArray) {
            processData(byteArray);
          }, onerror);
        } else {
          processData(url);
        }
      },indexedDB:function() {
        return window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB;
      },DB_NAME:function() {
        return 'EM_FS_' + window.location.pathname;
      },DB_VERSION:20,DB_STORE_NAME:"FILE_DATA",saveFilesToDB:function(paths, onload, onerror) {
        onload = onload || function(){};
        onerror = onerror || function(){};
        var indexedDB = FS.indexedDB();
        try {
          var openRequest = indexedDB.open(FS.DB_NAME(), FS.DB_VERSION);
        } catch (e) {
          return onerror(e);
        }
        openRequest.onupgradeneeded = function openRequest_onupgradeneeded() {
          out('creating db');
          var db = openRequest.result;
          db.createObjectStore(FS.DB_STORE_NAME);
        };
        openRequest.onsuccess = function openRequest_onsuccess() {
          var db = openRequest.result;
          var transaction = db.transaction([FS.DB_STORE_NAME], 'readwrite');
          var files = transaction.objectStore(FS.DB_STORE_NAME);
          var ok = 0, fail = 0, total = paths.length;
          function finish() {
            if (fail == 0) onload(); else onerror();
          }
          paths.forEach(function(path) {
            var putRequest = files.put(FS.analyzePath(path).object.contents, path);
            putRequest.onsuccess = function putRequest_onsuccess() { ok++; if (ok + fail == total) finish() };
            putRequest.onerror = function putRequest_onerror() { fail++; if (ok + fail == total) finish() };
          });
          transaction.onerror = onerror;
        };
        openRequest.onerror = onerror;
      },loadFilesFromDB:function(paths, onload, onerror) {
        onload = onload || function(){};
        onerror = onerror || function(){};
        var indexedDB = FS.indexedDB();
        try {
          var openRequest = indexedDB.open(FS.DB_NAME(), FS.DB_VERSION);
        } catch (e) {
          return onerror(e);
        }
        openRequest.onupgradeneeded = onerror; // no database to load from
        openRequest.onsuccess = function openRequest_onsuccess() {
          var db = openRequest.result;
          try {
            var transaction = db.transaction([FS.DB_STORE_NAME], 'readonly');
          } catch(e) {
            onerror(e);
            return;
          }
          var files = transaction.objectStore(FS.DB_STORE_NAME);
          var ok = 0, fail = 0, total = paths.length;
          function finish() {
            if (fail == 0) onload(); else onerror();
          }
          paths.forEach(function(path) {
            var getRequest = files.get(path);
            getRequest.onsuccess = function getRequest_onsuccess() {
              if (FS.analyzePath(path).exists) {
                FS.unlink(path);
              }
              FS.createDataFile(PATH.dirname(path), PATH.basename(path), getRequest.result, true, true, true);
              ok++;
              if (ok + fail == total) finish();
            };
            getRequest.onerror = function getRequest_onerror() { fail++; if (ok + fail == total) finish() };
          });
          transaction.onerror = onerror;
        };
        openRequest.onerror = onerror;
      },absolutePath:function() {
        abort('FS.absolutePath has been removed; use PATH_FS.resolve instead');
      },createFolder:function() {
        abort('FS.createFolder has been removed; use FS.mkdir instead');
      },createLink:function() {
        abort('FS.createLink has been removed; use FS.symlink instead');
      },joinPath:function() {
        abort('FS.joinPath has been removed; use PATH.join instead');
      },mmapAlloc:function() {
        abort('FS.mmapAlloc has been replaced by the top level function mmapAlloc');
      },standardizePath:function() {
        abort('FS.standardizePath has been removed; use PATH.normalize instead');
      }};
  var SYSCALLS={mappings:{},DEFAULT_POLLMASK:5,umask:511,calculateAt:function(dirfd, path, allowEmpty) {
        if (path[0] === '/') {
          return path;
        }
        // relative path
        var dir;
        if (dirfd === -100) {
          dir = FS.cwd();
        } else {
          var dirstream = FS.getStream(dirfd);
          if (!dirstream) throw new FS.ErrnoError(8);
          dir = dirstream.path;
        }
        if (path.length == 0) {
          if (!allowEmpty) {
            throw new FS.ErrnoError(44);;
          }
          return dir;
        }
        return PATH.join2(dir, path);
      },doStat:function(func, path, buf) {
        try {
          var stat = func(path);
        } catch (e) {
          if (e && e.node && PATH.normalize(path) !== PATH.normalize(FS.getPath(e.node))) {
            // an error occurred while trying to look up the path; we should just report ENOTDIR
            return -54;
          }
          throw e;
        }
        HEAP32[((buf)>>2)] = stat.dev;
        HEAP32[(((buf)+(4))>>2)] = 0;
        HEAP32[(((buf)+(8))>>2)] = stat.ino;
        HEAP32[(((buf)+(12))>>2)] = stat.mode;
        HEAP32[(((buf)+(16))>>2)] = stat.nlink;
        HEAP32[(((buf)+(20))>>2)] = stat.uid;
        HEAP32[(((buf)+(24))>>2)] = stat.gid;
        HEAP32[(((buf)+(28))>>2)] = stat.rdev;
        HEAP32[(((buf)+(32))>>2)] = 0;
        (tempI64 = [stat.size>>>0,(tempDouble=stat.size,(+(Math.abs(tempDouble))) >= 1.0 ? (tempDouble > 0.0 ? ((Math.min((+(Math.floor((tempDouble)/4294967296.0))), 4294967295.0))|0)>>>0 : (~~((+(Math.ceil((tempDouble - +(((~~(tempDouble)))>>>0))/4294967296.0)))))>>>0) : 0)],HEAP32[(((buf)+(40))>>2)] = tempI64[0],HEAP32[(((buf)+(44))>>2)] = tempI64[1]);
        HEAP32[(((buf)+(48))>>2)] = 4096;
        HEAP32[(((buf)+(52))>>2)] = stat.blocks;
        HEAP32[(((buf)+(56))>>2)] = (stat.atime.getTime() / 1000)|0;
        HEAP32[(((buf)+(60))>>2)] = 0;
        HEAP32[(((buf)+(64))>>2)] = (stat.mtime.getTime() / 1000)|0;
        HEAP32[(((buf)+(68))>>2)] = 0;
        HEAP32[(((buf)+(72))>>2)] = (stat.ctime.getTime() / 1000)|0;
        HEAP32[(((buf)+(76))>>2)] = 0;
        (tempI64 = [stat.ino>>>0,(tempDouble=stat.ino,(+(Math.abs(tempDouble))) >= 1.0 ? (tempDouble > 0.0 ? ((Math.min((+(Math.floor((tempDouble)/4294967296.0))), 4294967295.0))|0)>>>0 : (~~((+(Math.ceil((tempDouble - +(((~~(tempDouble)))>>>0))/4294967296.0)))))>>>0) : 0)],HEAP32[(((buf)+(80))>>2)] = tempI64[0],HEAP32[(((buf)+(84))>>2)] = tempI64[1]);
        return 0;
      },doMsync:function(addr, stream, len, flags, offset) {
        var buffer = HEAPU8.slice(addr, addr + len);
        FS.msync(stream, buffer, offset, len, flags);
      },doMkdir:function(path, mode) {
        // remove a trailing slash, if one - /a/b/ has basename of '', but
        // we want to create b in the context of this function
        path = PATH.normalize(path);
        if (path[path.length-1] === '/') path = path.substr(0, path.length-1);
        FS.mkdir(path, mode, 0);
        return 0;
      },doMknod:function(path, mode, dev) {
        // we don't want this in the JS API as it uses mknod to create all nodes.
        switch (mode & 61440) {
          case 32768:
          case 8192:
          case 24576:
          case 4096:
          case 49152:
            break;
          default: return -28;
        }
        FS.mknod(path, mode, dev);
        return 0;
      },doReadlink:function(path, buf, bufsize) {
        if (bufsize <= 0) return -28;
        var ret = FS.readlink(path);
  
        var len = Math.min(bufsize, lengthBytesUTF8(ret));
        var endChar = HEAP8[buf+len];
        stringToUTF8(ret, buf, bufsize+1);
        // readlink is one of the rare functions that write out a C string, but does never append a null to the output buffer(!)
        // stringToUTF8() always appends a null byte, so restore the character under the null byte after the write.
        HEAP8[buf+len] = endChar;
  
        return len;
      },doAccess:function(path, amode) {
        if (amode & ~7) {
          // need a valid mode
          return -28;
        }
        var node;
        var lookup = FS.lookupPath(path, { follow: true });
        node = lookup.node;
        if (!node) {
          return -44;
        }
        var perms = '';
        if (amode & 4) perms += 'r';
        if (amode & 2) perms += 'w';
        if (amode & 1) perms += 'x';
        if (perms /* otherwise, they've just passed F_OK */ && FS.nodePermissions(node, perms)) {
          return -2;
        }
        return 0;
      },doDup:function(path, flags, suggestFD) {
        var suggest = FS.getStream(suggestFD);
        if (suggest) FS.close(suggest);
        return FS.open(path, flags, 0, suggestFD, suggestFD).fd;
      },doReadv:function(stream, iov, iovcnt, offset) {
        var ret = 0;
        for (var i = 0; i < iovcnt; i++) {
          var ptr = HEAP32[(((iov)+(i*8))>>2)];
          var len = HEAP32[(((iov)+(i*8 + 4))>>2)];
          var curr = FS.read(stream, HEAP8,ptr, len, offset);
          if (curr < 0) return -1;
          ret += curr;
          if (curr < len) break; // nothing more to read
        }
        return ret;
      },doWritev:function(stream, iov, iovcnt, offset) {
        var ret = 0;
        for (var i = 0; i < iovcnt; i++) {
          var ptr = HEAP32[(((iov)+(i*8))>>2)];
          var len = HEAP32[(((iov)+(i*8 + 4))>>2)];
          var curr = FS.write(stream, HEAP8,ptr, len, offset);
          if (curr < 0) return -1;
          ret += curr;
        }
        return ret;
      },varargs:undefined,get:function() {
        assert(SYSCALLS.varargs != undefined);
        SYSCALLS.varargs += 4;
        var ret = HEAP32[(((SYSCALLS.varargs)-(4))>>2)];
        return ret;
      },getStr:function(ptr) {
        var ret = UTF8ToString(ptr);
        return ret;
      },getStreamFromFD:function(fd) {
        var stream = FS.getStream(fd);
        if (!stream) throw new FS.ErrnoError(8);
        return stream;
      },get64:function(low, high) {
        if (low >= 0) assert(high === 0);
        else assert(high === -1);
        return low;
      }};
  function ___sys_fcntl64(fd, cmd, varargs) {SYSCALLS.varargs = varargs;
  try {
  
      var stream = SYSCALLS.getStreamFromFD(fd);
      switch (cmd) {
        case 0: {
          var arg = SYSCALLS.get();
          if (arg < 0) {
            return -28;
          }
          var newStream;
          newStream = FS.open(stream.path, stream.flags, 0, arg);
          return newStream.fd;
        }
        case 1:
        case 2:
          return 0;  // FD_CLOEXEC makes no sense for a single process.
        case 3:
          return stream.flags;
        case 4: {
          var arg = SYSCALLS.get();
          stream.flags |= arg;
          return 0;
        }
        case 12:
        /* case 12: Currently in musl F_GETLK64 has same value as F_GETLK, so omitted to avoid duplicate case blocks. If that changes, uncomment this */ {
          
          var arg = SYSCALLS.get();
          var offset = 0;
          // We're always unlocked.
          HEAP16[(((arg)+(offset))>>1)] = 2;
          return 0;
        }
        case 13:
        case 14:
        /* case 13: Currently in musl F_SETLK64 has same value as F_SETLK, so omitted to avoid duplicate case blocks. If that changes, uncomment this */
        /* case 14: Currently in musl F_SETLKW64 has same value as F_SETLKW, so omitted to avoid duplicate case blocks. If that changes, uncomment this */
          
          
          return 0; // Pretend that the locking is successful.
        case 16:
        case 8:
          return -28; // These are for sockets. We don't have them fully implemented yet.
        case 9:
          // musl trusts getown return values, due to a bug where they must be, as they overlap with errors. just return -1 here, so fnctl() returns that, and we set errno ourselves.
          setErrNo(28);
          return -1;
        default: {
          return -28;
        }
      }
    } catch (e) {
    if (typeof FS === 'undefined' || !(e instanceof FS.ErrnoError)) abort(e);
    return -e.errno;
  }
  }

  function ___sys_ioctl(fd, op, varargs) {SYSCALLS.varargs = varargs;
  try {
  
      var stream = SYSCALLS.getStreamFromFD(fd);
      switch (op) {
        case 21509:
        case 21505: {
          if (!stream.tty) return -59;
          return 0;
        }
        case 21510:
        case 21511:
        case 21512:
        case 21506:
        case 21507:
        case 21508: {
          if (!stream.tty) return -59;
          return 0; // no-op, not actually adjusting terminal settings
        }
        case 21519: {
          if (!stream.tty) return -59;
          var argp = SYSCALLS.get();
          HEAP32[((argp)>>2)] = 0;
          return 0;
        }
        case 21520: {
          if (!stream.tty) return -59;
          return -28; // not supported
        }
        case 21531: {
          var argp = SYSCALLS.get();
          return FS.ioctl(stream, op, argp);
        }
        case 21523: {
          // TODO: in theory we should write to the winsize struct that gets
          // passed in, but for now musl doesn't read anything on it
          if (!stream.tty) return -59;
          return 0;
        }
        case 21524: {
          // TODO: technically, this ioctl call should change the window size.
          // but, since emscripten doesn't have any concept of a terminal window
          // yet, we'll just silently throw it away as we do TIOCGWINSZ
          if (!stream.tty) return -59;
          return 0;
        }
        default: abort('bad ioctl syscall ' + op);
      }
    } catch (e) {
    if (typeof FS === 'undefined' || !(e instanceof FS.ErrnoError)) abort(e);
    return -e.errno;
  }
  }

  function ___sys_open(path, flags, varargs) {SYSCALLS.varargs = varargs;
  try {
  
      var pathname = SYSCALLS.getStr(path);
      var mode = varargs ? SYSCALLS.get() : 0;
      var stream = FS.open(pathname, flags, mode);
      return stream.fd;
    } catch (e) {
    if (typeof FS === 'undefined' || !(e instanceof FS.ErrnoError)) abort(e);
    return -e.errno;
  }
  }

  function _abort() {
      abort();
    }

  var _emscripten_get_now;if (ENVIRONMENT_IS_NODE) {
    _emscripten_get_now = function() {
      var t = process['hrtime']();
      return t[0] * 1e3 + t[1] / 1e6;
    };
  } else if (typeof dateNow !== 'undefined') {
    _emscripten_get_now = dateNow;
  } else _emscripten_get_now = function() { return performance.now(); }
  ;
  
  var _emscripten_get_now_is_monotonic=true;;
  function _clock_gettime(clk_id, tp) {
      // int clock_gettime(clockid_t clk_id, struct timespec *tp);
      var now;
      if (clk_id === 0) {
        now = Date.now();
      } else if ((clk_id === 1 || clk_id === 4) && _emscripten_get_now_is_monotonic) {
        now = _emscripten_get_now();
      } else {
        setErrNo(28);
        return -1;
      }
      HEAP32[((tp)>>2)] = (now/1000)|0; // seconds
      HEAP32[(((tp)+(4))>>2)] = ((now % 1000)*1000*1000)|0; // nanoseconds
      return 0;
    }

  var readAsmConstArgsArray=[];
  function readAsmConstArgs(sigPtr, buf) {
      // Nobody should have mutated _readAsmConstArgsArray underneath us to be something else than an array.
      assert(Array.isArray(readAsmConstArgsArray));
      // The input buffer is allocated on the stack, so it must be stack-aligned.
      assert(buf % 16 == 0);
      readAsmConstArgsArray.length = 0;
      var ch;
      // Most arguments are i32s, so shift the buffer pointer so it is a plain
      // index into HEAP32.
      buf >>= 2;
      while (ch = HEAPU8[sigPtr++]) {
        assert(ch === 100/*'d'*/ || ch === 102/*'f'*/ || ch === 105 /*'i'*/);
        // A double takes two 32-bit slots, and must also be aligned - the backend
        // will emit padding to avoid that.
        var double = ch < 105;
        if (double && (buf & 1)) buf++;
        readAsmConstArgsArray.push(double ? HEAPF64[buf++ >> 1] : HEAP32[buf]);
        ++buf;
      }
      return readAsmConstArgsArray;
    }
  function _emscripten_asm_const_int(code, sigPtr, argbuf) {
      var args = readAsmConstArgs(sigPtr, argbuf);
      if (!ASM_CONSTS.hasOwnProperty(code)) abort('No EM_ASM constant found at address ' + code);
      return ASM_CONSTS[code].apply(null, args);
    }


  function _emscripten_memcpy_big(dest, src, num) {
      HEAPU8.copyWithin(dest, src, src + num);
    }

  function abortOnCannotGrowMemory(requestedSize) {
      abort('Cannot enlarge memory arrays to size ' + requestedSize + ' bytes (OOM). Either (1) compile with  -s INITIAL_MEMORY=X  with X higher than the current value ' + HEAP8.length + ', (2) compile with  -s ALLOW_MEMORY_GROWTH=1  which allows increasing the size at runtime, or (3) if you want malloc to return NULL (0) instead of this abort, compile with  -s ABORTING_MALLOC=0 ');
    }
  function _emscripten_resize_heap(requestedSize) {
      var oldSize = HEAPU8.length;
      requestedSize = requestedSize >>> 0;
      abortOnCannotGrowMemory(requestedSize);
    }

  function callUserCallback(func, synchronous) {
      if (ABORT) {
        err('user callback triggered after application aborted.  Ignoring.');
        return;
      }
      // For synchronous calls, let any exceptions propagate, and don't let the runtime exit.
      if (synchronous) {
        func();
        return;
      }
      try {
        func();
      } catch (e) {
        if (e instanceof ExitStatus) {
          return;
        } else if (e !== 'unwind') {
          // And actual unexpected user-exectpion occured
          if (e && typeof e === 'object' && e.stack) err('exception thrown: ' + [e, e.stack]);
          throw e;
        }
      }
    }
  
  function runtimeKeepalivePush() {
      runtimeKeepaliveCounter += 1;
    }
  
  function runtimeKeepalivePop() {
      assert(runtimeKeepaliveCounter > 0);
      runtimeKeepaliveCounter -= 1;
    }
  var Browser={mainLoop:{running:false,scheduler:null,method:"",currentlyRunningMainloop:0,func:null,arg:0,timingMode:0,timingValue:0,currentFrameNumber:0,queue:[],pause:function() {
          Browser.mainLoop.scheduler = null;
          // Incrementing this signals the previous main loop that it's now become old, and it must return.
          Browser.mainLoop.currentlyRunningMainloop++;
        },resume:function() {
          Browser.mainLoop.currentlyRunningMainloop++;
          var timingMode = Browser.mainLoop.timingMode;
          var timingValue = Browser.mainLoop.timingValue;
          var func = Browser.mainLoop.func;
          Browser.mainLoop.func = null;
          // do not set timing and call scheduler, we will do it on the next lines
          setMainLoop(func, 0, false, Browser.mainLoop.arg, true);
          _emscripten_set_main_loop_timing(timingMode, timingValue);
          Browser.mainLoop.scheduler();
        },updateStatus:function() {
          if (Module['setStatus']) {
            var message = Module['statusMessage'] || 'Please wait...';
            var remaining = Browser.mainLoop.remainingBlockers;
            var expected = Browser.mainLoop.expectedBlockers;
            if (remaining) {
              if (remaining < expected) {
                Module['setStatus'](message + ' (' + (expected - remaining) + '/' + expected + ')');
              } else {
                Module['setStatus'](message);
              }
            } else {
              Module['setStatus']('');
            }
          }
        },runIter:function(func) {
          if (ABORT) return;
          if (Module['preMainLoop']) {
            var preRet = Module['preMainLoop']();
            if (preRet === false) {
              return; // |return false| skips a frame
            }
          }
          callUserCallback(func);
          if (Module['postMainLoop']) Module['postMainLoop']();
        }},isFullscreen:false,pointerLock:false,moduleContextCreatedCallbacks:[],workers:[],init:function() {
        if (!Module["preloadPlugins"]) Module["preloadPlugins"] = []; // needs to exist even in workers
  
        if (Browser.initted) return;
        Browser.initted = true;
  
        try {
          new Blob();
          Browser.hasBlobConstructor = true;
        } catch(e) {
          Browser.hasBlobConstructor = false;
          console.log("warning: no blob constructor, cannot create blobs with mimetypes");
        }
        Browser.BlobBuilder = typeof MozBlobBuilder != "undefined" ? MozBlobBuilder : (typeof WebKitBlobBuilder != "undefined" ? WebKitBlobBuilder : (!Browser.hasBlobConstructor ? console.log("warning: no BlobBuilder") : null));
        Browser.URLObject = typeof window != "undefined" ? (window.URL ? window.URL : window.webkitURL) : undefined;
        if (!Module.noImageDecoding && typeof Browser.URLObject === 'undefined') {
          console.log("warning: Browser does not support creating object URLs. Built-in browser image decoding will not be available.");
          Module.noImageDecoding = true;
        }
  
        // Support for plugins that can process preloaded files. You can add more of these to
        // your app by creating and appending to Module.preloadPlugins.
        //
        // Each plugin is asked if it can handle a file based on the file's name. If it can,
        // it is given the file's raw data. When it is done, it calls a callback with the file's
        // (possibly modified) data. For example, a plugin might decompress a file, or it
        // might create some side data structure for use later (like an Image element, etc.).
  
        var imagePlugin = {};
        imagePlugin['canHandle'] = function imagePlugin_canHandle(name) {
          return !Module.noImageDecoding && /\.(jpg|jpeg|png|bmp)$/i.test(name);
        };
        imagePlugin['handle'] = function imagePlugin_handle(byteArray, name, onload, onerror) {
          var b = null;
          if (Browser.hasBlobConstructor) {
            try {
              b = new Blob([byteArray], { type: Browser.getMimetype(name) });
              if (b.size !== byteArray.length) { // Safari bug #118630
                // Safari's Blob can only take an ArrayBuffer
                b = new Blob([(new Uint8Array(byteArray)).buffer], { type: Browser.getMimetype(name) });
              }
            } catch(e) {
              warnOnce('Blob constructor present but fails: ' + e + '; falling back to blob builder');
            }
          }
          if (!b) {
            var bb = new Browser.BlobBuilder();
            bb.append((new Uint8Array(byteArray)).buffer); // we need to pass a buffer, and must copy the array to get the right data range
            b = bb.getBlob();
          }
          var url = Browser.URLObject.createObjectURL(b);
          assert(typeof url == 'string', 'createObjectURL must return a url as a string');
          var img = new Image();
          img.onload = function img_onload() {
            assert(img.complete, 'Image ' + name + ' could not be decoded');
            var canvas = document.createElement('canvas');
            canvas.width = img.width;
            canvas.height = img.height;
            var ctx = canvas.getContext('2d');
            ctx.drawImage(img, 0, 0);
            Module["preloadedImages"][name] = canvas;
            Browser.URLObject.revokeObjectURL(url);
            if (onload) onload(byteArray);
          };
          img.onerror = function img_onerror(event) {
            console.log('Image ' + url + ' could not be decoded');
            if (onerror) onerror();
          };
          img.src = url;
        };
        Module['preloadPlugins'].push(imagePlugin);
  
        var audioPlugin = {};
        audioPlugin['canHandle'] = function audioPlugin_canHandle(name) {
          return !Module.noAudioDecoding && name.substr(-4) in { '.ogg': 1, '.wav': 1, '.mp3': 1 };
        };
        audioPlugin['handle'] = function audioPlugin_handle(byteArray, name, onload, onerror) {
          var done = false;
          function finish(audio) {
            if (done) return;
            done = true;
            Module["preloadedAudios"][name] = audio;
            if (onload) onload(byteArray);
          }
          function fail() {
            if (done) return;
            done = true;
            Module["preloadedAudios"][name] = new Audio(); // empty shim
            if (onerror) onerror();
          }
          if (Browser.hasBlobConstructor) {
            try {
              var b = new Blob([byteArray], { type: Browser.getMimetype(name) });
            } catch(e) {
              return fail();
            }
            var url = Browser.URLObject.createObjectURL(b); // XXX we never revoke this!
            assert(typeof url == 'string', 'createObjectURL must return a url as a string');
            var audio = new Audio();
            audio.addEventListener('canplaythrough', function() { finish(audio) }, false); // use addEventListener due to chromium bug 124926
            audio.onerror = function audio_onerror(event) {
              if (done) return;
              console.log('warning: browser could not fully decode audio ' + name + ', trying slower base64 approach');
              function encode64(data) {
                var BASE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
                var PAD = '=';
                var ret = '';
                var leftchar = 0;
                var leftbits = 0;
                for (var i = 0; i < data.length; i++) {
                  leftchar = (leftchar << 8) | data[i];
                  leftbits += 8;
                  while (leftbits >= 6) {
                    var curr = (leftchar >> (leftbits-6)) & 0x3f;
                    leftbits -= 6;
                    ret += BASE[curr];
                  }
                }
                if (leftbits == 2) {
                  ret += BASE[(leftchar&3) << 4];
                  ret += PAD + PAD;
                } else if (leftbits == 4) {
                  ret += BASE[(leftchar&0xf) << 2];
                  ret += PAD;
                }
                return ret;
              }
              audio.src = 'data:audio/x-' + name.substr(-3) + ';base64,' + encode64(byteArray);
              finish(audio); // we don't wait for confirmation this worked - but it's worth trying
            };
            audio.src = url;
            // workaround for chrome bug 124926 - we do not always get oncanplaythrough or onerror
            Browser.safeSetTimeout(function() {
              finish(audio); // try to use it even though it is not necessarily ready to play
            }, 10000);
          } else {
            return fail();
          }
        };
        Module['preloadPlugins'].push(audioPlugin);
  
        // Canvas event setup
  
        function pointerLockChange() {
          Browser.pointerLock = document['pointerLockElement'] === Module['canvas'] ||
                                document['mozPointerLockElement'] === Module['canvas'] ||
                                document['webkitPointerLockElement'] === Module['canvas'] ||
                                document['msPointerLockElement'] === Module['canvas'];
        }
        var canvas = Module['canvas'];
        if (canvas) {
          // forced aspect ratio can be enabled by defining 'forcedAspectRatio' on Module
          // Module['forcedAspectRatio'] = 4 / 3;
  
          canvas.requestPointerLock = canvas['requestPointerLock'] ||
                                      canvas['mozRequestPointerLock'] ||
                                      canvas['webkitRequestPointerLock'] ||
                                      canvas['msRequestPointerLock'] ||
                                      function(){};
          canvas.exitPointerLock = document['exitPointerLock'] ||
                                   document['mozExitPointerLock'] ||
                                   document['webkitExitPointerLock'] ||
                                   document['msExitPointerLock'] ||
                                   function(){}; // no-op if function does not exist
          canvas.exitPointerLock = canvas.exitPointerLock.bind(document);
  
          document.addEventListener('pointerlockchange', pointerLockChange, false);
          document.addEventListener('mozpointerlockchange', pointerLockChange, false);
          document.addEventListener('webkitpointerlockchange', pointerLockChange, false);
          document.addEventListener('mspointerlockchange', pointerLockChange, false);
  
          if (Module['elementPointerLock']) {
            canvas.addEventListener("click", function(ev) {
              if (!Browser.pointerLock && Module['canvas'].requestPointerLock) {
                Module['canvas'].requestPointerLock();
                ev.preventDefault();
              }
            }, false);
          }
        }
      },createContext:function(canvas, useWebGL, setInModule, webGLContextAttributes) {
        if (useWebGL && Module.ctx && canvas == Module.canvas) return Module.ctx; // no need to recreate GL context if it's already been created for this canvas.
  
        var ctx;
        var contextHandle;
        if (useWebGL) {
          // For GLES2/desktop GL compatibility, adjust a few defaults to be different to WebGL defaults, so that they align better with the desktop defaults.
          var contextAttributes = {
            antialias: false,
            alpha: false,
            majorVersion: 1,
          };
  
          if (webGLContextAttributes) {
            for (var attribute in webGLContextAttributes) {
              contextAttributes[attribute] = webGLContextAttributes[attribute];
            }
          }
  
          // This check of existence of GL is here to satisfy Closure compiler, which yells if variable GL is referenced below but GL object is not
          // actually compiled in because application is not doing any GL operations. TODO: Ideally if GL is not being used, this function
          // Browser.createContext() should not even be emitted.
          if (typeof GL !== 'undefined') {
            contextHandle = GL.createContext(canvas, contextAttributes);
            if (contextHandle) {
              ctx = GL.getContext(contextHandle).GLctx;
            }
          }
        } else {
          ctx = canvas.getContext('2d');
        }
  
        if (!ctx) return null;
  
        if (setInModule) {
          if (!useWebGL) assert(typeof GLctx === 'undefined', 'cannot set in module if GLctx is used, but we are a non-GL context that would replace it');
  
          Module.ctx = ctx;
          if (useWebGL) GL.makeContextCurrent(contextHandle);
          Module.useWebGL = useWebGL;
          Browser.moduleContextCreatedCallbacks.forEach(function(callback) { callback() });
          Browser.init();
        }
        return ctx;
      },destroyContext:function(canvas, useWebGL, setInModule) {},fullscreenHandlersInstalled:false,lockPointer:undefined,resizeCanvas:undefined,requestFullscreen:function(lockPointer, resizeCanvas) {
        Browser.lockPointer = lockPointer;
        Browser.resizeCanvas = resizeCanvas;
        if (typeof Browser.lockPointer === 'undefined') Browser.lockPointer = true;
        if (typeof Browser.resizeCanvas === 'undefined') Browser.resizeCanvas = false;
  
        var canvas = Module['canvas'];
        function fullscreenChange() {
          Browser.isFullscreen = false;
          var canvasContainer = canvas.parentNode;
          if ((document['fullscreenElement'] || document['mozFullScreenElement'] ||
               document['msFullscreenElement'] || document['webkitFullscreenElement'] ||
               document['webkitCurrentFullScreenElement']) === canvasContainer) {
            canvas.exitFullscreen = Browser.exitFullscreen;
            if (Browser.lockPointer) canvas.requestPointerLock();
            Browser.isFullscreen = true;
            if (Browser.resizeCanvas) {
              Browser.setFullscreenCanvasSize();
            } else {
              Browser.updateCanvasDimensions(canvas);
            }
          } else {
            // remove the full screen specific parent of the canvas again to restore the HTML structure from before going full screen
            canvasContainer.parentNode.insertBefore(canvas, canvasContainer);
            canvasContainer.parentNode.removeChild(canvasContainer);
  
            if (Browser.resizeCanvas) {
              Browser.setWindowedCanvasSize();
            } else {
              Browser.updateCanvasDimensions(canvas);
            }
          }
          if (Module['onFullScreen']) Module['onFullScreen'](Browser.isFullscreen);
          if (Module['onFullscreen']) Module['onFullscreen'](Browser.isFullscreen);
        }
  
        if (!Browser.fullscreenHandlersInstalled) {
          Browser.fullscreenHandlersInstalled = true;
          document.addEventListener('fullscreenchange', fullscreenChange, false);
          document.addEventListener('mozfullscreenchange', fullscreenChange, false);
          document.addEventListener('webkitfullscreenchange', fullscreenChange, false);
          document.addEventListener('MSFullscreenChange', fullscreenChange, false);
        }
  
        // create a new parent to ensure the canvas has no siblings. this allows browsers to optimize full screen performance when its parent is the full screen root
        var canvasContainer = document.createElement("div");
        canvas.parentNode.insertBefore(canvasContainer, canvas);
        canvasContainer.appendChild(canvas);
  
        // use parent of canvas as full screen root to allow aspect ratio correction (Firefox stretches the root to screen size)
        canvasContainer.requestFullscreen = canvasContainer['requestFullscreen'] ||
                                            canvasContainer['mozRequestFullScreen'] ||
                                            canvasContainer['msRequestFullscreen'] ||
                                           (canvasContainer['webkitRequestFullscreen'] ? function() { canvasContainer['webkitRequestFullscreen'](Element['ALLOW_KEYBOARD_INPUT']) } : null) ||
                                           (canvasContainer['webkitRequestFullScreen'] ? function() { canvasContainer['webkitRequestFullScreen'](Element['ALLOW_KEYBOARD_INPUT']) } : null);
  
        canvasContainer.requestFullscreen();
      },requestFullScreen:function() {
        abort('Module.requestFullScreen has been replaced by Module.requestFullscreen (without a capital S)');
      },exitFullscreen:function() {
        // This is workaround for chrome. Trying to exit from fullscreen
        // not in fullscreen state will cause "TypeError: Document not active"
        // in chrome. See https://github.com/emscripten-core/emscripten/pull/8236
        if (!Browser.isFullscreen) {
          return false;
        }
  
        var CFS = document['exitFullscreen'] ||
                  document['cancelFullScreen'] ||
                  document['mozCancelFullScreen'] ||
                  document['msExitFullscreen'] ||
                  document['webkitCancelFullScreen'] ||
            (function() {});
        CFS.apply(document, []);
        return true;
      },nextRAF:0,fakeRequestAnimationFrame:function(func) {
        // try to keep 60fps between calls to here
        var now = Date.now();
        if (Browser.nextRAF === 0) {
          Browser.nextRAF = now + 1000/60;
        } else {
          while (now + 2 >= Browser.nextRAF) { // fudge a little, to avoid timer jitter causing us to do lots of delay:0
            Browser.nextRAF += 1000/60;
          }
        }
        var delay = Math.max(Browser.nextRAF - now, 0);
        setTimeout(func, delay);
      },requestAnimationFrame:function(func) {
        if (typeof requestAnimationFrame === 'function') {
          requestAnimationFrame(func);
          return;
        }
        var RAF = Browser.fakeRequestAnimationFrame;
        RAF(func);
      },safeRequestAnimationFrame:function(func) {
        
        return Browser.requestAnimationFrame(function() {
          
          callUserCallback(func);
        });
      },safeSetTimeout:function(func, timeout) {
        
        return setTimeout(function() {
          
          callUserCallback(func);
        }, timeout);
      },getMimetype:function(name) {
        return {
          'jpg': 'image/jpeg',
          'jpeg': 'image/jpeg',
          'png': 'image/png',
          'bmp': 'image/bmp',
          'ogg': 'audio/ogg',
          'wav': 'audio/wav',
          'mp3': 'audio/mpeg'
        }[name.substr(name.lastIndexOf('.')+1)];
      },getUserMedia:function(func) {
        if (!window.getUserMedia) {
          window.getUserMedia = navigator['getUserMedia'] ||
                                navigator['mozGetUserMedia'];
        }
        window.getUserMedia(func);
      },getMovementX:function(event) {
        return event['movementX'] ||
               event['mozMovementX'] ||
               event['webkitMovementX'] ||
               0;
      },getMovementY:function(event) {
        return event['movementY'] ||
               event['mozMovementY'] ||
               event['webkitMovementY'] ||
               0;
      },getMouseWheelDelta:function(event) {
        var delta = 0;
        switch (event.type) {
          case 'DOMMouseScroll':
            // 3 lines make up a step
            delta = event.detail / 3;
            break;
          case 'mousewheel':
            // 120 units make up a step
            delta = event.wheelDelta / 120;
            break;
          case 'wheel':
            delta = event.deltaY
            switch (event.deltaMode) {
              case 0:
                // DOM_DELTA_PIXEL: 100 pixels make up a step
                delta /= 100;
                break;
              case 1:
                // DOM_DELTA_LINE: 3 lines make up a step
                delta /= 3;
                break;
              case 2:
                // DOM_DELTA_PAGE: A page makes up 80 steps
                delta *= 80;
                break;
              default:
                throw 'unrecognized mouse wheel delta mode: ' + event.deltaMode;
            }
            break;
          default:
            throw 'unrecognized mouse wheel event: ' + event.type;
        }
        return delta;
      },mouseX:0,mouseY:0,mouseMovementX:0,mouseMovementY:0,touches:{},lastTouches:{},calculateMouseEvent:function(event) { // event should be mousemove, mousedown or mouseup
        if (Browser.pointerLock) {
          // When the pointer is locked, calculate the coordinates
          // based on the movement of the mouse.
          // Workaround for Firefox bug 764498
          if (event.type != 'mousemove' &&
              ('mozMovementX' in event)) {
            Browser.mouseMovementX = Browser.mouseMovementY = 0;
          } else {
            Browser.mouseMovementX = Browser.getMovementX(event);
            Browser.mouseMovementY = Browser.getMovementY(event);
          }
  
          // check if SDL is available
          if (typeof SDL != "undefined") {
            Browser.mouseX = SDL.mouseX + Browser.mouseMovementX;
            Browser.mouseY = SDL.mouseY + Browser.mouseMovementY;
          } else {
            // just add the mouse delta to the current absolut mouse position
            // FIXME: ideally this should be clamped against the canvas size and zero
            Browser.mouseX += Browser.mouseMovementX;
            Browser.mouseY += Browser.mouseMovementY;
          }
        } else {
          // Otherwise, calculate the movement based on the changes
          // in the coordinates.
          var rect = Module["canvas"].getBoundingClientRect();
          var cw = Module["canvas"].width;
          var ch = Module["canvas"].height;
  
          // Neither .scrollX or .pageXOffset are defined in a spec, but
          // we prefer .scrollX because it is currently in a spec draft.
          // (see: http://www.w3.org/TR/2013/WD-cssom-view-20131217/)
          var scrollX = ((typeof window.scrollX !== 'undefined') ? window.scrollX : window.pageXOffset);
          var scrollY = ((typeof window.scrollY !== 'undefined') ? window.scrollY : window.pageYOffset);
          // If this assert lands, it's likely because the browser doesn't support scrollX or pageXOffset
          // and we have no viable fallback.
          assert((typeof scrollX !== 'undefined') && (typeof scrollY !== 'undefined'), 'Unable to retrieve scroll position, mouse positions likely broken.');
  
          if (event.type === 'touchstart' || event.type === 'touchend' || event.type === 'touchmove') {
            var touch = event.touch;
            if (touch === undefined) {
              return; // the "touch" property is only defined in SDL
  
            }
            var adjustedX = touch.pageX - (scrollX + rect.left);
            var adjustedY = touch.pageY - (scrollY + rect.top);
  
            adjustedX = adjustedX * (cw / rect.width);
            adjustedY = adjustedY * (ch / rect.height);
  
            var coords = { x: adjustedX, y: adjustedY };
  
            if (event.type === 'touchstart') {
              Browser.lastTouches[touch.identifier] = coords;
              Browser.touches[touch.identifier] = coords;
            } else if (event.type === 'touchend' || event.type === 'touchmove') {
              var last = Browser.touches[touch.identifier];
              if (!last) last = coords;
              Browser.lastTouches[touch.identifier] = last;
              Browser.touches[touch.identifier] = coords;
            }
            return;
          }
  
          var x = event.pageX - (scrollX + rect.left);
          var y = event.pageY - (scrollY + rect.top);
  
          // the canvas might be CSS-scaled compared to its backbuffer;
          // SDL-using content will want mouse coordinates in terms
          // of backbuffer units.
          x = x * (cw / rect.width);
          y = y * (ch / rect.height);
  
          Browser.mouseMovementX = x - Browser.mouseX;
          Browser.mouseMovementY = y - Browser.mouseY;
          Browser.mouseX = x;
          Browser.mouseY = y;
        }
      },asyncLoad:function(url, onload, onerror, noRunDep) {
        var dep = !noRunDep ? getUniqueRunDependency('al ' + url) : '';
        readAsync(url, function(arrayBuffer) {
          assert(arrayBuffer, 'Loading data file "' + url + '" failed (no arrayBuffer).');
          onload(new Uint8Array(arrayBuffer));
          if (dep) removeRunDependency(dep);
        }, function(event) {
          if (onerror) {
            onerror();
          } else {
            throw 'Loading data file "' + url + '" failed.';
          }
        });
        if (dep) addRunDependency(dep);
      },resizeListeners:[],updateResizeListeners:function() {
        var canvas = Module['canvas'];
        Browser.resizeListeners.forEach(function(listener) {
          listener(canvas.width, canvas.height);
        });
      },setCanvasSize:function(width, height, noUpdates) {
        var canvas = Module['canvas'];
        Browser.updateCanvasDimensions(canvas, width, height);
        if (!noUpdates) Browser.updateResizeListeners();
      },windowedWidth:0,windowedHeight:0,setFullscreenCanvasSize:function() {
        // check if SDL is available
        if (typeof SDL != "undefined") {
          var flags = HEAPU32[((SDL.screen)>>2)];
          flags = flags | 0x00800000; // set SDL_FULLSCREEN flag
          HEAP32[((SDL.screen)>>2)] = flags
        }
        Browser.updateCanvasDimensions(Module['canvas']);
        Browser.updateResizeListeners();
      },setWindowedCanvasSize:function() {
        // check if SDL is available
        if (typeof SDL != "undefined") {
          var flags = HEAPU32[((SDL.screen)>>2)];
          flags = flags & ~0x00800000; // clear SDL_FULLSCREEN flag
          HEAP32[((SDL.screen)>>2)] = flags
        }
        Browser.updateCanvasDimensions(Module['canvas']);
        Browser.updateResizeListeners();
      },updateCanvasDimensions:function(canvas, wNative, hNative) {
        if (wNative && hNative) {
          canvas.widthNative = wNative;
          canvas.heightNative = hNative;
        } else {
          wNative = canvas.widthNative;
          hNative = canvas.heightNative;
        }
        var w = wNative;
        var h = hNative;
        if (Module['forcedAspectRatio'] && Module['forcedAspectRatio'] > 0) {
          if (w/h < Module['forcedAspectRatio']) {
            w = Math.round(h * Module['forcedAspectRatio']);
          } else {
            h = Math.round(w / Module['forcedAspectRatio']);
          }
        }
        if (((document['fullscreenElement'] || document['mozFullScreenElement'] ||
             document['msFullscreenElement'] || document['webkitFullscreenElement'] ||
             document['webkitCurrentFullScreenElement']) === canvas.parentNode) && (typeof screen != 'undefined')) {
           var factor = Math.min(screen.width / w, screen.height / h);
           w = Math.round(w * factor);
           h = Math.round(h * factor);
        }
        if (Browser.resizeCanvas) {
          if (canvas.width  != w) canvas.width  = w;
          if (canvas.height != h) canvas.height = h;
          if (typeof canvas.style != 'undefined') {
            canvas.style.removeProperty( "width");
            canvas.style.removeProperty("height");
          }
        } else {
          if (canvas.width  != wNative) canvas.width  = wNative;
          if (canvas.height != hNative) canvas.height = hNative;
          if (typeof canvas.style != 'undefined') {
            if (w != wNative || h != hNative) {
              canvas.style.setProperty( "width", w + "px", "important");
              canvas.style.setProperty("height", h + "px", "important");
            } else {
              canvas.style.removeProperty( "width");
              canvas.style.removeProperty("height");
            }
          }
        }
      },wgetRequests:{},nextWgetRequestHandle:0,getNextWgetRequestHandle:function() {
        var handle = Browser.nextWgetRequestHandle;
        Browser.nextWgetRequestHandle++;
        return handle;
      }};
  function _emscripten_set_main_loop_timing(mode, value) {
      Browser.mainLoop.timingMode = mode;
      Browser.mainLoop.timingValue = value;
  
      if (!Browser.mainLoop.func) {
        console.error('emscripten_set_main_loop_timing: Cannot set timing mode for main loop since a main loop does not exist! Call emscripten_set_main_loop first to set one up.');
        return 1; // Return non-zero on failure, can't set timing mode when there is no main loop.
      }
  
      if (!Browser.mainLoop.running) {
        
        Browser.mainLoop.running = true;
      }
      if (mode == 0 /*EM_TIMING_SETTIMEOUT*/) {
        Browser.mainLoop.scheduler = function Browser_mainLoop_scheduler_setTimeout() {
          var timeUntilNextTick = Math.max(0, Browser.mainLoop.tickStartTime + value - _emscripten_get_now())|0;
          setTimeout(Browser.mainLoop.runner, timeUntilNextTick); // doing this each time means that on exception, we stop
        };
        Browser.mainLoop.method = 'timeout';
      } else if (mode == 1 /*EM_TIMING_RAF*/) {
        Browser.mainLoop.scheduler = function Browser_mainLoop_scheduler_rAF() {
          Browser.requestAnimationFrame(Browser.mainLoop.runner);
        };
        Browser.mainLoop.method = 'rAF';
      } else if (mode == 2 /*EM_TIMING_SETIMMEDIATE*/) {
        if (typeof setImmediate === 'undefined') {
          // Emulate setImmediate. (note: not a complete polyfill, we don't emulate clearImmediate() to keep code size to minimum, since not needed)
          var setImmediates = [];
          var emscriptenMainLoopMessageId = 'setimmediate';
          var Browser_setImmediate_messageHandler = function(event) {
            // When called in current thread or Worker, the main loop ID is structured slightly different to accommodate for --proxy-to-worker runtime listening to Worker events,
            // so check for both cases.
            if (event.data === emscriptenMainLoopMessageId || event.data.target === emscriptenMainLoopMessageId) {
              event.stopPropagation();
              setImmediates.shift()();
            }
          }
          addEventListener("message", Browser_setImmediate_messageHandler, true);
          setImmediate = /** @type{function(function(): ?, ...?): number} */(function Browser_emulated_setImmediate(func) {
            setImmediates.push(func);
            if (ENVIRONMENT_IS_WORKER) {
              if (Module['setImmediates'] === undefined) Module['setImmediates'] = [];
              Module['setImmediates'].push(func);
              postMessage({target: emscriptenMainLoopMessageId}); // In --proxy-to-worker, route the message via proxyClient.js
            } else postMessage(emscriptenMainLoopMessageId, "*"); // On the main thread, can just send the message to itself.
          })
        }
        Browser.mainLoop.scheduler = function Browser_mainLoop_scheduler_setImmediate() {
          setImmediate(Browser.mainLoop.runner);
        };
        Browser.mainLoop.method = 'immediate';
      }
      return 0;
    }
  
  function _exit(status) {
      // void _exit(int status);
      // http://pubs.opengroup.org/onlinepubs/000095399/functions/exit.html
      exit(status);
    }
  function maybeExit() {
      if (!keepRuntimeAlive()) {
        try {
          _exit(EXITSTATUS);
        } catch (e) {
          if (e instanceof ExitStatus) {
            return;
          }
          throw e;
        }
      }
    }
  function setMainLoop(browserIterationFunc, fps, simulateInfiniteLoop, arg, noSetTiming) {
      assert(!Browser.mainLoop.func, 'emscripten_set_main_loop: there can only be one main loop function at once: call emscripten_cancel_main_loop to cancel the previous one before setting a new one with different parameters.');
  
      Browser.mainLoop.func = browserIterationFunc;
      Browser.mainLoop.arg = arg;
  
      var thisMainLoopId = Browser.mainLoop.currentlyRunningMainloop;
      function checkIsRunning() {
        if (thisMainLoopId < Browser.mainLoop.currentlyRunningMainloop) {
          
          maybeExit();
          return false;
        }
        return true;
      }
  
      // We create the loop runner here but it is not actually running until
      // _emscripten_set_main_loop_timing is called (which might happen a
      // later time).  This member signifies that the current runner has not
      // yet been started so that we can call runtimeKeepalivePush when it
      // gets it timing set for the first time.
      Browser.mainLoop.running = false;
      Browser.mainLoop.runner = function Browser_mainLoop_runner() {
        if (ABORT) return;
        if (Browser.mainLoop.queue.length > 0) {
          var start = Date.now();
          var blocker = Browser.mainLoop.queue.shift();
          blocker.func(blocker.arg);
          if (Browser.mainLoop.remainingBlockers) {
            var remaining = Browser.mainLoop.remainingBlockers;
            var next = remaining%1 == 0 ? remaining-1 : Math.floor(remaining);
            if (blocker.counted) {
              Browser.mainLoop.remainingBlockers = next;
            } else {
              // not counted, but move the progress along a tiny bit
              next = next + 0.5; // do not steal all the next one's progress
              Browser.mainLoop.remainingBlockers = (8*remaining + next)/9;
            }
          }
          console.log('main loop blocker "' + blocker.name + '" took ' + (Date.now() - start) + ' ms'); //, left: ' + Browser.mainLoop.remainingBlockers);
          Browser.mainLoop.updateStatus();
  
          // catches pause/resume main loop from blocker execution
          if (!checkIsRunning()) return;
  
          setTimeout(Browser.mainLoop.runner, 0);
          return;
        }
  
        // catch pauses from non-main loop sources
        if (!checkIsRunning()) return;
  
        // Implement very basic swap interval control
        Browser.mainLoop.currentFrameNumber = Browser.mainLoop.currentFrameNumber + 1 | 0;
        if (Browser.mainLoop.timingMode == 1/*EM_TIMING_RAF*/ && Browser.mainLoop.timingValue > 1 && Browser.mainLoop.currentFrameNumber % Browser.mainLoop.timingValue != 0) {
          // Not the scheduled time to render this frame - skip.
          Browser.mainLoop.scheduler();
          return;
        } else if (Browser.mainLoop.timingMode == 0/*EM_TIMING_SETTIMEOUT*/) {
          Browser.mainLoop.tickStartTime = _emscripten_get_now();
        }
  
        // Signal GL rendering layer that processing of a new frame is about to start. This helps it optimize
        // VBO double-buffering and reduce GPU stalls.
        GL.newRenderingFrameStarted();
  
        if (Browser.mainLoop.method === 'timeout' && Module.ctx) {
          warnOnce('Looks like you are rendering without using requestAnimationFrame for the main loop. You should use 0 for the frame rate in emscripten_set_main_loop in order to use requestAnimationFrame, as that can greatly improve your frame rates!');
          Browser.mainLoop.method = ''; // just warn once per call to set main loop
        }
  
        Browser.mainLoop.runIter(browserIterationFunc);
  
        checkStackCookie();
  
        // catch pauses from the main loop itself
        if (!checkIsRunning()) return;
  
        // Queue new audio data. This is important to be right after the main loop invocation, so that we will immediately be able
        // to queue the newest produced audio samples.
        // TODO: Consider adding pre- and post- rAF callbacks so that GL.newRenderingFrameStarted() and SDL.audio.queueNewAudioData()
        //       do not need to be hardcoded into this function, but can be more generic.
        if (typeof SDL === 'object' && SDL.audio && SDL.audio.queueNewAudioData) SDL.audio.queueNewAudioData();
  
        Browser.mainLoop.scheduler();
      }
  
      if (!noSetTiming) {
        if (fps && fps > 0) _emscripten_set_main_loop_timing(0/*EM_TIMING_SETTIMEOUT*/, 1000.0 / fps);
        else _emscripten_set_main_loop_timing(1/*EM_TIMING_RAF*/, 1); // Do rAF by rendering each frame (no decimating)
  
        Browser.mainLoop.scheduler();
      }
  
      if (simulateInfiniteLoop) {
        throw 'unwind';
      }
    }
  function _emscripten_set_main_loop(func, fps, simulateInfiniteLoop) {
      var browserIterationFunc = (function() {  dynCall_v.call(null, func); });
      setMainLoop(browserIterationFunc, fps, simulateInfiniteLoop);
    }

  function _emscripten_wget(url, file) {
      Asyncify.handleSleep(function(wakeUp) {
        var _url = UTF8ToString(url);
        var _file = UTF8ToString(file);
        _file = PATH_FS.resolve(FS.cwd(), _file);
        var destinationDirectory = PATH.dirname(_file);
        FS.createPreloadedFile(
          destinationDirectory,
          PATH.basename(_file),
          _url, true, true,
          wakeUp,
          wakeUp,
          undefined, // dontCreateFile
          undefined, // canOwn
          function() { // preFinish
            // if the destination directory does not yet exist, create it
            FS.mkdirTree(destinationDirectory);
          }
        );
      });
    }

  function _fd_close(fd) {try {
  
      var stream = SYSCALLS.getStreamFromFD(fd);
      FS.close(stream);
      return 0;
    } catch (e) {
    if (typeof FS === 'undefined' || !(e instanceof FS.ErrnoError)) abort(e);
    return e.errno;
  }
  }

  function _fd_read(fd, iov, iovcnt, pnum) {try {
  
      var stream = SYSCALLS.getStreamFromFD(fd);
      var num = SYSCALLS.doReadv(stream, iov, iovcnt);
      HEAP32[((pnum)>>2)] = num
      return 0;
    } catch (e) {
    if (typeof FS === 'undefined' || !(e instanceof FS.ErrnoError)) abort(e);
    return e.errno;
  }
  }

  function _fd_seek(fd, offset_low, offset_high, whence, newOffset) {try {
  
      
      var stream = SYSCALLS.getStreamFromFD(fd);
      var HIGH_OFFSET = 0x100000000; // 2^32
      // use an unsigned operator on low and shift high by 32-bits
      var offset = offset_high * HIGH_OFFSET + (offset_low >>> 0);
  
      var DOUBLE_LIMIT = 0x20000000000000; // 2^53
      // we also check for equality since DOUBLE_LIMIT + 1 == DOUBLE_LIMIT
      if (offset <= -DOUBLE_LIMIT || offset >= DOUBLE_LIMIT) {
        return -61;
      }
  
      FS.llseek(stream, offset, whence);
      (tempI64 = [stream.position>>>0,(tempDouble=stream.position,(+(Math.abs(tempDouble))) >= 1.0 ? (tempDouble > 0.0 ? ((Math.min((+(Math.floor((tempDouble)/4294967296.0))), 4294967295.0))|0)>>>0 : (~~((+(Math.ceil((tempDouble - +(((~~(tempDouble)))>>>0))/4294967296.0)))))>>>0) : 0)],HEAP32[((newOffset)>>2)] = tempI64[0],HEAP32[(((newOffset)+(4))>>2)] = tempI64[1]);
      if (stream.getdents && offset === 0 && whence === 0) stream.getdents = null; // reset readdir state
      return 0;
    } catch (e) {
    if (typeof FS === 'undefined' || !(e instanceof FS.ErrnoError)) abort(e);
    return e.errno;
  }
  }

  function _fd_write(fd, iov, iovcnt, pnum) {try {
  
      var stream = SYSCALLS.getStreamFromFD(fd);
      var num = SYSCALLS.doWritev(stream, iov, iovcnt);
      HEAP32[((pnum)>>2)] = num
      return 0;
    } catch (e) {
    if (typeof FS === 'undefined' || !(e instanceof FS.ErrnoError)) abort(e);
    return e.errno;
  }
  }

  function _glAlphaFunc(){}

  function __webgl_enable_ANGLE_instanced_arrays(ctx) {
      // Extension available in WebGL 1 from Firefox 26 and Google Chrome 30 onwards. Core feature in WebGL 2.
      var ext = ctx.getExtension('ANGLE_instanced_arrays');
      if (ext) {
        ctx['vertexAttribDivisor'] = function(index, divisor) { ext['vertexAttribDivisorANGLE'](index, divisor); };
        ctx['drawArraysInstanced'] = function(mode, first, count, primcount) { ext['drawArraysInstancedANGLE'](mode, first, count, primcount); };
        ctx['drawElementsInstanced'] = function(mode, count, type, indices, primcount) { ext['drawElementsInstancedANGLE'](mode, count, type, indices, primcount); };
        return 1;
      }
    }
  
  function __webgl_enable_OES_vertex_array_object(ctx) {
      // Extension available in WebGL 1 from Firefox 25 and WebKit 536.28/desktop Safari 6.0.3 onwards. Core feature in WebGL 2.
      var ext = ctx.getExtension('OES_vertex_array_object');
      if (ext) {
        ctx['createVertexArray'] = function() { return ext['createVertexArrayOES'](); };
        ctx['deleteVertexArray'] = function(vao) { ext['deleteVertexArrayOES'](vao); };
        ctx['bindVertexArray'] = function(vao) { ext['bindVertexArrayOES'](vao); };
        ctx['isVertexArray'] = function(vao) { return ext['isVertexArrayOES'](vao); };
        return 1;
      }
    }
  
  function __webgl_enable_WEBGL_draw_buffers(ctx) {
      // Extension available in WebGL 1 from Firefox 28 onwards. Core feature in WebGL 2.
      var ext = ctx.getExtension('WEBGL_draw_buffers');
      if (ext) {
        ctx['drawBuffers'] = function(n, bufs) { ext['drawBuffersWEBGL'](n, bufs); };
        return 1;
      }
    }
  
  function __webgl_enable_WEBGL_multi_draw(ctx) {
      // Closure is expected to be allowed to minify the '.multiDrawWebgl' property, so not accessing it quoted.
      return !!(ctx.multiDrawWebgl = ctx.getExtension('WEBGL_multi_draw'));
    }
  var GL={counter:1,buffers:[],programs:[],framebuffers:[],renderbuffers:[],textures:[],shaders:[],vaos:[],contexts:[],offscreenCanvases:{},queries:[],byteSizeByTypeRoot:5120,byteSizeByType:[1,1,2,2,4,4,4,2,3,4,8],stringCache:{},unpackAlignment:4,recordError:function recordError(errorCode) {
        if (!GL.lastError) {
          GL.lastError = errorCode;
        }
      },getNewId:function(table) {
        var ret = GL.counter++;
        for (var i = table.length; i < ret; i++) {
          table[i] = null;
        }
        return ret;
      },MAX_TEMP_BUFFER_SIZE:2097152,numTempVertexBuffersPerSize:64,log2ceilLookup:function(i) {
        return 32 - Math.clz32(i === 0 ? 0 : i - 1);
      },generateTempBuffers:function(quads, context) {
        var largestIndex = GL.log2ceilLookup(GL.MAX_TEMP_BUFFER_SIZE);
        context.tempVertexBufferCounters1 = [];
        context.tempVertexBufferCounters2 = [];
        context.tempVertexBufferCounters1.length = context.tempVertexBufferCounters2.length = largestIndex+1;
        context.tempVertexBuffers1 = [];
        context.tempVertexBuffers2 = [];
        context.tempVertexBuffers1.length = context.tempVertexBuffers2.length = largestIndex+1;
        context.tempIndexBuffers = [];
        context.tempIndexBuffers.length = largestIndex+1;
        for (var i = 0; i <= largestIndex; ++i) {
          context.tempIndexBuffers[i] = null; // Created on-demand
          context.tempVertexBufferCounters1[i] = context.tempVertexBufferCounters2[i] = 0;
          var ringbufferLength = GL.numTempVertexBuffersPerSize;
          context.tempVertexBuffers1[i] = [];
          context.tempVertexBuffers2[i] = [];
          var ringbuffer1 = context.tempVertexBuffers1[i];
          var ringbuffer2 = context.tempVertexBuffers2[i];
          ringbuffer1.length = ringbuffer2.length = ringbufferLength;
          for (var j = 0; j < ringbufferLength; ++j) {
            ringbuffer1[j] = ringbuffer2[j] = null; // Created on-demand
          }
        }
  
        if (quads) {
          // GL_QUAD indexes can be precalculated
          context.tempQuadIndexBuffer = GLctx.createBuffer();
          context.GLctx.bindBuffer(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, context.tempQuadIndexBuffer);
          var numIndexes = GL.MAX_TEMP_BUFFER_SIZE >> 1;
          var quadIndexes = new Uint16Array(numIndexes);
          var i = 0, v = 0;
          while (1) {
            quadIndexes[i++] = v;
            if (i >= numIndexes) break;
            quadIndexes[i++] = v+1;
            if (i >= numIndexes) break;
            quadIndexes[i++] = v+2;
            if (i >= numIndexes) break;
            quadIndexes[i++] = v;
            if (i >= numIndexes) break;
            quadIndexes[i++] = v+2;
            if (i >= numIndexes) break;
            quadIndexes[i++] = v+3;
            if (i >= numIndexes) break;
            v += 4;
          }
          context.GLctx.bufferData(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, quadIndexes, 0x88E4 /*GL_STATIC_DRAW*/);
          context.GLctx.bindBuffer(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, null);
        }
      },getTempVertexBuffer:function getTempVertexBuffer(sizeBytes) {
        var idx = GL.log2ceilLookup(sizeBytes);
        var ringbuffer = GL.currentContext.tempVertexBuffers1[idx];
        var nextFreeBufferIndex = GL.currentContext.tempVertexBufferCounters1[idx];
        GL.currentContext.tempVertexBufferCounters1[idx] = (GL.currentContext.tempVertexBufferCounters1[idx]+1) & (GL.numTempVertexBuffersPerSize-1);
        var vbo = ringbuffer[nextFreeBufferIndex];
        if (vbo) {
          return vbo;
        }
        var prevVBO = GLctx.getParameter(0x8894 /*GL_ARRAY_BUFFER_BINDING*/);
        ringbuffer[nextFreeBufferIndex] = GLctx.createBuffer();
        GLctx.bindBuffer(0x8892 /*GL_ARRAY_BUFFER*/, ringbuffer[nextFreeBufferIndex]);
        GLctx.bufferData(0x8892 /*GL_ARRAY_BUFFER*/, 1 << idx, 0x88E8 /*GL_DYNAMIC_DRAW*/);
        GLctx.bindBuffer(0x8892 /*GL_ARRAY_BUFFER*/, prevVBO);
        return ringbuffer[nextFreeBufferIndex];
      },getTempIndexBuffer:function getTempIndexBuffer(sizeBytes) {
        var idx = GL.log2ceilLookup(sizeBytes);
        var ibo = GL.currentContext.tempIndexBuffers[idx];
        if (ibo) {
          return ibo;
        }
        var prevIBO = GLctx.getParameter(0x8895 /*ELEMENT_ARRAY_BUFFER_BINDING*/);
        GL.currentContext.tempIndexBuffers[idx] = GLctx.createBuffer();
        GLctx.bindBuffer(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, GL.currentContext.tempIndexBuffers[idx]);
        GLctx.bufferData(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, 1 << idx, 0x88E8 /*GL_DYNAMIC_DRAW*/);
        GLctx.bindBuffer(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, prevIBO);
        return GL.currentContext.tempIndexBuffers[idx];
      },newRenderingFrameStarted:function newRenderingFrameStarted() {
        if (!GL.currentContext) {
          return;
        }
        var vb = GL.currentContext.tempVertexBuffers1;
        GL.currentContext.tempVertexBuffers1 = GL.currentContext.tempVertexBuffers2;
        GL.currentContext.tempVertexBuffers2 = vb;
        vb = GL.currentContext.tempVertexBufferCounters1;
        GL.currentContext.tempVertexBufferCounters1 = GL.currentContext.tempVertexBufferCounters2;
        GL.currentContext.tempVertexBufferCounters2 = vb;
        var largestIndex = GL.log2ceilLookup(GL.MAX_TEMP_BUFFER_SIZE);
        for (var i = 0; i <= largestIndex; ++i) {
          GL.currentContext.tempVertexBufferCounters1[i] = 0;
        }
      },getSource:function(shader, count, string, length) {
        var source = '';
        for (var i = 0; i < count; ++i) {
          var len = length ? HEAP32[(((length)+(i*4))>>2)] : -1;
          source += UTF8ToString(HEAP32[(((string)+(i*4))>>2)], len < 0 ? undefined : len);
        }
        // Let's see if we need to enable the standard derivatives extension
        var type = GLctx.getShaderParameter(GL.shaders[shader], 0x8B4F /* GL_SHADER_TYPE */);
        if (type == 0x8B30 /* GL_FRAGMENT_SHADER */) {
          if (GLEmulation.findToken(source, "dFdx") ||
              GLEmulation.findToken(source, "dFdy") ||
              GLEmulation.findToken(source, "fwidth")) {
            source = "#extension GL_OES_standard_derivatives : enable\n" + source;
            var extension = GLctx.getExtension("OES_standard_derivatives");
          }
        }
        return source;
      },enabledClientAttribIndices:[],enableVertexAttribArray:function enableVertexAttribArray(index) {
        if (!GL.enabledClientAttribIndices[index]) {
          GL.enabledClientAttribIndices[index] = true;
          GLctx.enableVertexAttribArray(index);
        }
      },disableVertexAttribArray:function disableVertexAttribArray(index) {
        if (GL.enabledClientAttribIndices[index]) {
          GL.enabledClientAttribIndices[index] = false;
          GLctx.disableVertexAttribArray(index);
        }
      },createContext:function(canvas, webGLContextAttributes) {
  
        // BUG: Workaround Safari WebGL issue: After successfully acquiring WebGL context on a canvas,
        // calling .getContext() will always return that context independent of which 'webgl' or 'webgl2'
        // context version was passed. See https://bugs.webkit.org/show_bug.cgi?id=222758 and
        // https://github.com/emscripten-core/emscripten/issues/13295.
        // TODO: Once the bug is fixed and shipped in Safari, adjust the Safari version field in above check.
        if (!canvas.getContextSafariWebGL2Fixed) {
          canvas.getContextSafariWebGL2Fixed = canvas.getContext;
          canvas.getContext = function(ver, attrs) {
            var gl = canvas.getContextSafariWebGL2Fixed(ver, attrs);
            return ((ver == 'webgl') == (gl instanceof WebGLRenderingContext)) ? gl : null;
          }
        }
  
        var ctx = 
          (canvas.getContext("webgl", webGLContextAttributes)
            // https://caniuse.com/#feat=webgl
            );
  
        if (!ctx) return 0;
  
        var handle = GL.registerContext(ctx, webGLContextAttributes);
  
        return handle;
      },registerContext:function(ctx, webGLContextAttributes) {
        // without pthreads a context is just an integer ID
        var handle = GL.getNewId(GL.contexts);
  
        var context = {
          handle: handle,
          attributes: webGLContextAttributes,
          version: webGLContextAttributes.majorVersion,
          GLctx: ctx
        };
  
        // Store the created context object so that we can access the context given a canvas without having to pass the parameters again.
        if (ctx.canvas) ctx.canvas.GLctxObject = context;
        GL.contexts[handle] = context;
        if (typeof webGLContextAttributes.enableExtensionsByDefault === 'undefined' || webGLContextAttributes.enableExtensionsByDefault) {
          GL.initExtensions(context);
        }
  
        return handle;
      },makeContextCurrent:function(contextHandle) {
  
        GL.currentContext = GL.contexts[contextHandle]; // Active Emscripten GL layer context object.
        Module.ctx = GLctx = GL.currentContext && GL.currentContext.GLctx; // Active WebGL context object.
        return !(contextHandle && !GLctx);
      },getContext:function(contextHandle) {
        return GL.contexts[contextHandle];
      },deleteContext:function(contextHandle) {
        if (GL.currentContext === GL.contexts[contextHandle]) GL.currentContext = null;
        if (typeof JSEvents === 'object') JSEvents.removeAllHandlersOnTarget(GL.contexts[contextHandle].GLctx.canvas); // Release all JS event handlers on the DOM element that the GL context is associated with since the context is now deleted.
        if (GL.contexts[contextHandle] && GL.contexts[contextHandle].GLctx.canvas) GL.contexts[contextHandle].GLctx.canvas.GLctxObject = undefined; // Make sure the canvas object no longer refers to the context object so there are no GC surprises.
        GL.contexts[contextHandle] = null;
      },initExtensions:function(context) {
        // If this function is called without a specific context object, init the extensions of the currently active context.
        if (!context) context = GL.currentContext;
  
        if (context.initExtensionsDone) return;
        context.initExtensionsDone = true;
  
        var GLctx = context.GLctx;
  
        // Detect the presence of a few extensions manually, this GL interop layer itself will need to know if they exist.
        context.compressionExt = GLctx.getExtension('WEBGL_compressed_texture_s3tc');
        context.anisotropicExt = GLctx.getExtension('EXT_texture_filter_anisotropic');
  
        // Extensions that are only available in WebGL 1 (the calls will be no-ops if called on a WebGL 2 context active)
        __webgl_enable_ANGLE_instanced_arrays(GLctx);
        __webgl_enable_OES_vertex_array_object(GLctx);
        __webgl_enable_WEBGL_draw_buffers(GLctx);
  
        {
          GLctx.disjointTimerQueryExt = GLctx.getExtension("EXT_disjoint_timer_query");
        }
  
        __webgl_enable_WEBGL_multi_draw(GLctx);
  
        // .getSupportedExtensions() can return null if context is lost, so coerce to empty array.
        var exts = GLctx.getSupportedExtensions() || [];
        exts.forEach(function(ext) {
          // WEBGL_lose_context, WEBGL_debug_renderer_info and WEBGL_debug_shaders are not enabled by default.
          if (!ext.includes('lose_context') && !ext.includes('debug')) {
            // Call .getExtension() to enable that extension permanently.
            GLctx.getExtension(ext);
          }
        });
      }};
  
  function _glEnable(x0) { GLctx['enable'](x0) }
  
  function _glDisable(x0) { GLctx['disable'](x0) }
  
  function _glIsEnabled(x0) { return GLctx['isEnabled'](x0) }
  
  function readI53FromI64(ptr) {
      return HEAPU32[ptr>>2] + HEAP32[ptr+4>>2] * 4294967296;
    }
  
  function readI53FromU64(ptr) {
      return HEAPU32[ptr>>2] + HEAPU32[ptr+4>>2] * 4294967296;
    }
  function writeI53ToI64(ptr, num) {
      HEAPU32[ptr>>2] = num;
      HEAPU32[ptr+4>>2] = (num - HEAPU32[ptr>>2])/4294967296;
      var deserialized = (num >= 0) ? readI53FromU64(ptr) : readI53FromI64(ptr);
      if (deserialized != num) warnOnce('writeI53ToI64() out of range: serialized JS Number ' + num + ' to Wasm heap as bytes lo=0x' + HEAPU32[ptr>>2].toString(16) + ', hi=0x' + HEAPU32[ptr+4>>2].toString(16) + ', which deserializes back to ' + deserialized + ' instead!');
    }
  function emscriptenWebGLGet(name_, p, type) {
      // Guard against user passing a null pointer.
      // Note that GLES2 spec does not say anything about how passing a null pointer should be treated.
      // Testing on desktop core GL 3, the application crashes on glGetIntegerv to a null pointer, but
      // better to report an error instead of doing anything random.
      if (!p) {
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      var ret = undefined;
      switch (name_) { // Handle a few trivial GLES values
        case 0x8DFA: // GL_SHADER_COMPILER
          ret = 1;
          break;
        case 0x8DF8: // GL_SHADER_BINARY_FORMATS
          if (type != 0 && type != 1) {
            GL.recordError(0x500); // GL_INVALID_ENUM
          }
          return; // Do not write anything to the out pointer, since no binary formats are supported.
        case 0x8DF9: // GL_NUM_SHADER_BINARY_FORMATS
          ret = 0;
          break;
        case 0x86A2: // GL_NUM_COMPRESSED_TEXTURE_FORMATS
          // WebGL doesn't have GL_NUM_COMPRESSED_TEXTURE_FORMATS (it's obsolete since GL_COMPRESSED_TEXTURE_FORMATS returns a JS array that can be queried for length),
          // so implement it ourselves to allow C++ GLES2 code get the length.
          var formats = GLctx.getParameter(0x86A3 /*GL_COMPRESSED_TEXTURE_FORMATS*/);
          ret = formats ? formats.length : 0;
          break;
  
      }
  
      if (ret === undefined) {
        var result = GLctx.getParameter(name_);
        switch (typeof(result)) {
          case "number":
            ret = result;
            break;
          case "boolean":
            ret = result ? 1 : 0;
            break;
          case "string":
            GL.recordError(0x500); // GL_INVALID_ENUM
            return;
          case "object":
            if (result === null) {
              // null is a valid result for some (e.g., which buffer is bound - perhaps nothing is bound), but otherwise
              // can mean an invalid name_, which we need to report as an error
              switch (name_) {
                case 0x8894: // ARRAY_BUFFER_BINDING
                case 0x8B8D: // CURRENT_PROGRAM
                case 0x8895: // ELEMENT_ARRAY_BUFFER_BINDING
                case 0x8CA6: // FRAMEBUFFER_BINDING or DRAW_FRAMEBUFFER_BINDING
                case 0x8CA7: // RENDERBUFFER_BINDING
                case 0x8069: // TEXTURE_BINDING_2D
                case 0x85B5: // WebGL 2 GL_VERTEX_ARRAY_BINDING, or WebGL 1 extension OES_vertex_array_object GL_VERTEX_ARRAY_BINDING_OES
                case 0x8514: { // TEXTURE_BINDING_CUBE_MAP
                  ret = 0;
                  break;
                }
                default: {
                  GL.recordError(0x500); // GL_INVALID_ENUM
                  return;
                }
              }
            } else if (result instanceof Float32Array ||
                       result instanceof Uint32Array ||
                       result instanceof Int32Array ||
                       result instanceof Array) {
              for (var i = 0; i < result.length; ++i) {
                switch (type) {
                  case 0: HEAP32[(((p)+(i*4))>>2)] = result[i]; break;
                  case 2: HEAPF32[(((p)+(i*4))>>2)] = result[i]; break;
                  case 4: HEAP8[(((p)+(i))>>0)] = result[i] ? 1 : 0; break;
                }
              }
              return;
            } else {
              try {
                ret = result.name | 0;
              } catch(e) {
                GL.recordError(0x500); // GL_INVALID_ENUM
                err('GL_INVALID_ENUM in glGet' + type + 'v: Unknown object returned from WebGL getParameter(' + name_ + ')! (error: ' + e + ')');
                return;
              }
            }
            break;
          default:
            GL.recordError(0x500); // GL_INVALID_ENUM
            err('GL_INVALID_ENUM in glGet' + type + 'v: Native code calling glGet' + type + 'v(' + name_ + ') and it returns ' + result + ' of type ' + typeof(result) + '!');
            return;
        }
      }
  
      switch (type) {
        case 1: writeI53ToI64(p, ret); break;
        case 0: HEAP32[((p)>>2)] = ret; break;
        case 2:   HEAPF32[((p)>>2)] = ret; break;
        case 4: HEAP8[((p)>>0)] = ret ? 1 : 0; break;
      }
    }
  function _glGetBooleanv(name_, p) {
      emscriptenWebGLGet(name_, p, 4);
    }
  
  function _glGetIntegerv(name_, p) {
      emscriptenWebGLGet(name_, p, 0);
    }
  
  function stringToNewUTF8(jsString) {
      var length = lengthBytesUTF8(jsString)+1;
      var cString = _malloc(length);
      stringToUTF8(jsString, cString, length);
      return cString;
    }
  function _glGetString(name_) {
      var ret = GL.stringCache[name_];
      if (!ret) {
        switch (name_) {
          case 0x1F03 /* GL_EXTENSIONS */:
            var exts = GLctx.getSupportedExtensions() || []; // .getSupportedExtensions() can return null if context is lost, so coerce to empty array.
            exts = exts.concat(exts.map(function(e) { return "GL_" + e; }));
            ret = stringToNewUTF8(exts.join(' '));
            break;
          case 0x1F00 /* GL_VENDOR */:
          case 0x1F01 /* GL_RENDERER */:
          case 0x9245 /* UNMASKED_VENDOR_WEBGL */:
          case 0x9246 /* UNMASKED_RENDERER_WEBGL */:
            var s = GLctx.getParameter(name_);
            if (!s) {
              GL.recordError(0x500/*GL_INVALID_ENUM*/);
            }
            ret = s && stringToNewUTF8(s);
            break;
  
          case 0x1F02 /* GL_VERSION */:
            var glVersion = GLctx.getParameter(0x1F02 /*GL_VERSION*/);
            // return GLES version string corresponding to the version of the WebGL context
            {
              glVersion = 'OpenGL ES 2.0 (' + glVersion + ')';
            }
            ret = stringToNewUTF8(glVersion);
            break;
          case 0x8B8C /* GL_SHADING_LANGUAGE_VERSION */:
            var glslVersion = GLctx.getParameter(0x8B8C /*GL_SHADING_LANGUAGE_VERSION*/);
            // extract the version number 'N.M' from the string 'WebGL GLSL ES N.M ...'
            var ver_re = /^WebGL GLSL ES ([0-9]\.[0-9][0-9]?)(?:$| .*)/;
            var ver_num = glslVersion.match(ver_re);
            if (ver_num !== null) {
              if (ver_num[1].length == 3) ver_num[1] = ver_num[1] + '0'; // ensure minor version has 2 digits
              glslVersion = 'OpenGL ES GLSL ES ' + ver_num[1] + ' (' + glslVersion + ')';
            }
            ret = stringToNewUTF8(glslVersion);
            break;
          default:
            GL.recordError(0x500/*GL_INVALID_ENUM*/);
            // fall through
        }
        GL.stringCache[name_] = ret;
      }
      return ret;
    }
  
  function _glCreateShader(shaderType) {
      var id = GL.getNewId(GL.shaders);
      GL.shaders[id] = GLctx.createShader(shaderType);
  
      return id;
    }
  
  function _glShaderSource(shader, count, string, length) {
      var source = GL.getSource(shader, count, string, length);
  
      GLctx.shaderSource(GL.shaders[shader], source);
    }
  
  function _glCompileShader(shader) {
      GLctx.compileShader(GL.shaders[shader]);
    }
  
  function _glAttachShader(program, shader) {
      GLctx.attachShader(GL.programs[program], GL.shaders[shader]);
    }
  
  function _glDetachShader(program, shader) {
      GLctx.detachShader(GL.programs[program], GL.shaders[shader]);
    }
  
  function _glUseProgram(program) {
      program = GL.programs[program];
      GLctx.useProgram(program);
      // Record the currently active program so that we can access the uniform
      // mapping table of that program.
      GLctx.currentProgram = program;
    }
  
  function _glDeleteProgram(id) {
      if (!id) return;
      var program = GL.programs[id];
      if (!program) { // glDeleteProgram actually signals an error when deleting a nonexisting object, unlike some other GL delete functions.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      GLctx.deleteProgram(program);
      program.name = 0;
      GL.programs[id] = null;
    }
  
  function _glBindAttribLocation(program, index, name) {
      GLctx.bindAttribLocation(GL.programs[program], index, UTF8ToString(name));
    }
  
  function _glLinkProgram(program) {
      program = GL.programs[program];
      GLctx.linkProgram(program);
      // Invalidate earlier computed uniform->ID mappings, those have now become stale
      program.uniformLocsById = 0; // Mark as null-like so that glGetUniformLocation() knows to populate this again.
      program.uniformSizeAndIdsByName = {};
  
    }
  
  function _glBindBuffer(target, buffer) {
      if (target == 0x8892 /*GL_ARRAY_BUFFER*/) {
        GLctx.currentArrayBufferBinding = buffer;
        GLImmediate.lastArrayBuffer = buffer;
      } else if (target == 0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/) {
        GLctx.currentElementArrayBufferBinding = buffer;
      }
  
      GLctx.bindBuffer(target, GL.buffers[buffer]);
    }
  
  function _glGetFloatv(name_, p) {
      emscriptenWebGLGet(name_, p, 2);
    }
  
  function _glHint(x0, x1) { GLctx['hint'](x0, x1) }
  
  function _glEnableVertexAttribArray(index) {
      GLctx.enableVertexAttribArray(index);
    }
  
  function _glDisableVertexAttribArray(index) {
      GLctx.disableVertexAttribArray(index);
    }
  
  function _glVertexAttribPointer(index, size, type, normalized, stride, ptr) {
      GLctx.vertexAttribPointer(index, size, type, !!normalized, stride, ptr);
    }
  
  function _glActiveTexture(x0) { GLctx['activeTexture'](x0) }
  var GLEmulation={fogStart:0,fogEnd:1,fogDensity:1,fogColor:null,fogMode:2048,fogEnabled:false,MAX_CLIP_PLANES:6,clipPlaneEnabled:[false,false,false,false,false,false],clipPlaneEquation:[],lightingEnabled:false,lightModelAmbient:null,lightModelLocalViewer:false,lightModelTwoSide:false,materialAmbient:null,materialDiffuse:null,materialSpecular:null,materialShininess:null,materialEmission:null,MAX_LIGHTS:8,lightEnabled:[false,false,false,false,false,false,false,false],lightAmbient:[],lightDiffuse:[],lightSpecular:[],lightPosition:[],pointSize:1,vaos:[],currentVao:null,enabledVertexAttribArrays:{},hasRunInit:false,findToken:function(source, token) {
        function isIdentChar(ch) {
          if (ch >= 48 && ch <= 57) // 0-9
            return true;
          if (ch >= 65 && ch <= 90) // A-Z
            return true;
          if (ch >= 97 && ch <= 122) // a-z
            return true;
          return false;
        }
        var i = -1;
        do {
          i = source.indexOf(token, i + 1);
          if (i < 0) {
            break;
          }
          if (i > 0 && isIdentChar(source[i - 1])) {
            continue;
          }
          i += token.length;
          if (i < source.length - 1 && isIdentChar(source[i + 1])) {
            continue;
          }
          return true;
        } while (true);
        return false;
      },init:function() {
        // Do not activate immediate/emulation code (e.g. replace glDrawElements) when in FULL_ES2 mode.
        // We do not need full emulation, we instead emulate client-side arrays etc. in FULL_ES2 code in
        // a straightforward manner, and avoid not having a bound buffer be ambiguous between es2 emulation
        // code and legacy gl emulation code.
  
        if (GLEmulation.hasRunInit) {
          return;
        }
        GLEmulation.hasRunInit = true;
  
        GLEmulation.fogColor = new Float32Array(4);
  
        for (var clipPlaneId = 0; clipPlaneId < GLEmulation.MAX_CLIP_PLANES; clipPlaneId++) {
          GLEmulation.clipPlaneEquation[clipPlaneId] = new Float32Array(4);
        }
  
        // set defaults for GL_LIGHTING
        GLEmulation.lightModelAmbient = new Float32Array([0.2, 0.2, 0.2, 1.0]);
        GLEmulation.materialAmbient = new Float32Array([0.2, 0.2, 0.2, 1.0]);
        GLEmulation.materialDiffuse = new Float32Array([0.8, 0.8, 0.8, 1.0]);
        GLEmulation.materialSpecular = new Float32Array([0.0, 0.0, 0.0, 1.0]);
        GLEmulation.materialShininess = new Float32Array([0.0]);
        GLEmulation.materialEmission = new Float32Array([0.0, 0.0, 0.0, 1.0]);
  
        for (var lightId = 0; lightId < GLEmulation.MAX_LIGHTS; lightId++) {
          GLEmulation.lightAmbient[lightId] = new Float32Array([0.0, 0.0, 0.0, 1.0]);
          GLEmulation.lightDiffuse[lightId] = lightId ? new Float32Array([0.0, 0.0, 0.0, 1.0]) : new Float32Array([1.0, 1.0, 1.0, 1.0]);
          GLEmulation.lightSpecular[lightId] = lightId ? new Float32Array([0.0, 0.0, 0.0, 1.0]) : new Float32Array([1.0, 1.0, 1.0, 1.0]);
          GLEmulation.lightPosition[lightId] = new Float32Array([0.0, 0.0, 1.0, 0.0]);
        }
  
        // Add some emulation workarounds
        err('WARNING: using emscripten GL emulation. This is a collection of limited workarounds, do not expect it to work.');
        err('WARNING: using emscripten GL emulation unsafe opts. If weirdness happens, try -s GL_UNSAFE_OPTS=0');
  
        // XXX some of the capabilities we don't support may lead to incorrect rendering, if we do not emulate them in shaders
        var validCapabilities = {
          0xB44: 1, // GL_CULL_FACE
          0xBE2: 1, // GL_BLEND
          0xBD0: 1, // GL_DITHER,
          0xB90: 1, // GL_STENCIL_TEST
          0xB71: 1, // GL_DEPTH_TEST
          0xC11: 1, // GL_SCISSOR_TEST
          0x8037: 1, // GL_POLYGON_OFFSET_FILL
          0x809E: 1, // GL_SAMPLE_ALPHA_TO_COVERAGE
          0x80A0: 1  // GL_SAMPLE_COVERAGE
        };
  
  
  
        var glEnable = _glEnable;
        _glEnable = _emscripten_glEnable = function _glEnable(cap) {
          // Clean up the renderer on any change to the rendering state. The optimization of
          // skipping renderer setup is aimed at the case of multiple glDraw* right after each other
          if (GLImmediate.lastRenderer) GLImmediate.lastRenderer.cleanup();
          if (cap == 0xB60 /* GL_FOG */) {
            if (GLEmulation.fogEnabled != true) {
              GLImmediate.currentRenderer = null; // Fog parameter is part of the FFP shader state, we must re-lookup the renderer to use.
              GLEmulation.fogEnabled = true;
            }
            return;
          } else if ((cap >= 0x3000) && (cap < 0x3006)  /* GL_CLIP_PLANE0 to GL_CLIP_PLANE5 */) {
            var clipPlaneId = cap - 0x3000;
            if (GLEmulation.clipPlaneEnabled[clipPlaneId] != true) {
              GLImmediate.currentRenderer = null; // clip plane parameter is part of the FFP shader state, we must re-lookup the renderer to use.
              GLEmulation.clipPlaneEnabled[clipPlaneId] = true;
            }
            return;
          } else if ((cap >= 0x4000) && (cap < 0x4008)  /* GL_LIGHT0 to GL_LIGHT7 */) {
            var lightId = cap - 0x4000;
            if (GLEmulation.lightEnabled[lightId] != true) {
              GLImmediate.currentRenderer = null; // light parameter is part of the FFP shader state, we must re-lookup the renderer to use.
              GLEmulation.lightEnabled[lightId] = true;
            }
            return;
          } else if (cap == 0xB50 /* GL_LIGHTING */) {
            if (GLEmulation.lightingEnabled != true) {
              GLImmediate.currentRenderer = null; // light parameter is part of the FFP shader state, we must re-lookup the renderer to use.
              GLEmulation.lightingEnabled = true;
            }
            return;
          } else if (cap == 0xDE1 /* GL_TEXTURE_2D */) {
            // XXX not according to spec, and not in desktop GL, but works in some GLES1.x apparently, so support
            // it by forwarding to glEnableClientState
            /* Actually, let's not, for now. (This sounds exceedingly broken)
             * This is in gl_ps_workaround2.c.
            _glEnableClientState(cap);
            */
            return;
          } else if (!(cap in validCapabilities)) {
            return;
          }
          glEnable(cap);
        };
        
  
        var glDisable = _glDisable;
        _glDisable = _emscripten_glDisable = function _glDisable(cap) {
          if (GLImmediate.lastRenderer) GLImmediate.lastRenderer.cleanup();
          if (cap == 0xB60 /* GL_FOG */) {
            if (GLEmulation.fogEnabled != false) {
              GLImmediate.currentRenderer = null; // Fog parameter is part of the FFP shader state, we must re-lookup the renderer to use.
              GLEmulation.fogEnabled = false;
            }
            return;
          } else if ((cap >= 0x3000) && (cap < 0x3006)  /* GL_CLIP_PLANE0 to GL_CLIP_PLANE5 */) {
            var clipPlaneId = cap - 0x3000;
            if (GLEmulation.clipPlaneEnabled[clipPlaneId] != false) {
              GLImmediate.currentRenderer = null; // clip plane parameter is part of the FFP shader state, we must re-lookup the renderer to use.
              GLEmulation.clipPlaneEnabled[clipPlaneId] = false;
            }
            return;
          } else if ((cap >= 0x4000) && (cap < 0x4008)  /* GL_LIGHT0 to GL_LIGHT7 */) {
            var lightId = cap - 0x4000;
            if (GLEmulation.lightEnabled[lightId] != false) {
              GLImmediate.currentRenderer = null; // light parameter is part of the FFP shader state, we must re-lookup the renderer to use.
              GLEmulation.lightEnabled[lightId] = false;
            }
            return;
          } else if (cap == 0xB50 /* GL_LIGHTING */) {
            if (GLEmulation.lightingEnabled != false) {
              GLImmediate.currentRenderer = null; // Fog parameter is part of the FFP shader state, we must re-lookup the renderer to use.
              GLEmulation.lightingEnabled = false;
            }
            return;
          } else if (cap == 0xDE1 /* GL_TEXTURE_2D */) {
            // XXX not according to spec, and not in desktop GL, but works in some GLES1.x apparently, so support
            // it by forwarding to glDisableClientState
            /* Actually, let's not, for now. (This sounds exceedingly broken)
             * This is in gl_ps_workaround2.c.
            _glDisableClientState(cap);
            */
            return;
          } else if (!(cap in validCapabilities)) {
            return;
          }
          glDisable(cap);
        };
        
  
        _glIsEnabled = _emscripten_glIsEnabled = function _glIsEnabled(cap) {
          if (cap == 0xB60 /* GL_FOG */) {
            return GLEmulation.fogEnabled ? 1 : 0;
          } else if ((cap >= 0x3000) && (cap < 0x3006)  /* GL_CLIP_PLANE0 to GL_CLIP_PLANE5 */) {
            var clipPlaneId = cap - 0x3000;
            return GLEmulation.clipPlaneEnabled[clipPlaneId] ? 1 : 0;
          } else if ((cap >= 0x4000) && (cap < 0x4008)  /* GL_LIGHT0 to GL_LIGHT7 */) {
            var lightId = cap - 0x4000;
            return GLEmulation.lightEnabled[lightId] ? 1 : 0;
          } else if (cap == 0xB50 /* GL_LIGHTING */) {
            return GLEmulation.lightingEnabled ? 1 : 0;
          } else if (!(cap in validCapabilities)) {
            return 0;
          }
          return GLctx.isEnabled(cap);
        };
        
  
        var glGetBooleanv = _glGetBooleanv;
        _glGetBooleanv = _emscripten_glGetBooleanv = function _glGetBooleanv(pname, p) {
          var attrib = GLEmulation.getAttributeFromCapability(pname);
          if (attrib !== null) {
            var result = GLImmediate.enabledClientAttributes[attrib];
            HEAP8[((p)>>0)] = result === true ? 1 : 0;
            return;
          }
          glGetBooleanv(pname, p);
        };
        
  
        var glGetIntegerv = _glGetIntegerv;
        _glGetIntegerv = _emscripten_glGetIntegerv = function _glGetIntegerv(pname, params) {
          switch (pname) {
            case 0x84E2: pname = GLctx.MAX_TEXTURE_IMAGE_UNITS /* fake it */; break; // GL_MAX_TEXTURE_UNITS
            case 0x8B4A: { // GL_MAX_VERTEX_UNIFORM_COMPONENTS_ARB
              var result = GLctx.getParameter(GLctx.MAX_VERTEX_UNIFORM_VECTORS);
              HEAP32[((params)>>2)] = result*4; // GLES gives num of 4-element vectors, GL wants individual components, so multiply
              return;
            }
            case 0x8B49: { // GL_MAX_FRAGMENT_UNIFORM_COMPONENTS_ARB
              var result = GLctx.getParameter(GLctx.MAX_FRAGMENT_UNIFORM_VECTORS);
              HEAP32[((params)>>2)] = result*4; // GLES gives num of 4-element vectors, GL wants individual components, so multiply
              return;
            }
            case 0x8B4B: { // GL_MAX_VARYING_FLOATS_ARB
              var result = GLctx.getParameter(GLctx.MAX_VARYING_VECTORS);
              HEAP32[((params)>>2)] = result*4; // GLES gives num of 4-element vectors, GL wants individual components, so multiply
              return;
            }
            case 0x8871: pname = GLctx.MAX_COMBINED_TEXTURE_IMAGE_UNITS /* close enough */; break; // GL_MAX_TEXTURE_COORDS
            case 0x807A: { // GL_VERTEX_ARRAY_SIZE
              var attribute = GLImmediate.clientAttributes[GLImmediate.VERTEX];
              HEAP32[((params)>>2)] = attribute ? attribute.size : 0;
              return;
            }
            case 0x807B: { // GL_VERTEX_ARRAY_TYPE
              var attribute = GLImmediate.clientAttributes[GLImmediate.VERTEX];
              HEAP32[((params)>>2)] = attribute ? attribute.type : 0;
              return;
            }
            case 0x807C: { // GL_VERTEX_ARRAY_STRIDE
              var attribute = GLImmediate.clientAttributes[GLImmediate.VERTEX];
              HEAP32[((params)>>2)] = attribute ? attribute.stride : 0;
              return;
            }
            case 0x8081: { // GL_COLOR_ARRAY_SIZE
              var attribute = GLImmediate.clientAttributes[GLImmediate.COLOR];
              HEAP32[((params)>>2)] = attribute ? attribute.size : 0;
              return;
            }
            case 0x8082: { // GL_COLOR_ARRAY_TYPE
              var attribute = GLImmediate.clientAttributes[GLImmediate.COLOR];
              HEAP32[((params)>>2)] = attribute ? attribute.type : 0;
              return;
            }
            case 0x8083: { // GL_COLOR_ARRAY_STRIDE
              var attribute = GLImmediate.clientAttributes[GLImmediate.COLOR];
              HEAP32[((params)>>2)] = attribute ? attribute.stride : 0;
              return;
            }
            case 0x8088: { // GL_TEXTURE_COORD_ARRAY_SIZE
              var attribute = GLImmediate.clientAttributes[GLImmediate.TEXTURE0 + GLImmediate.clientActiveTexture];
              HEAP32[((params)>>2)] = attribute ? attribute.size : 0;
              return;
            }
            case 0x8089: { // GL_TEXTURE_COORD_ARRAY_TYPE
              var attribute = GLImmediate.clientAttributes[GLImmediate.TEXTURE0 + GLImmediate.clientActiveTexture];
              HEAP32[((params)>>2)] = attribute ? attribute.type : 0;
              return;
            }
            case 0x808A: { // GL_TEXTURE_COORD_ARRAY_STRIDE
              var attribute = GLImmediate.clientAttributes[GLImmediate.TEXTURE0 + GLImmediate.clientActiveTexture];
              HEAP32[((params)>>2)] = attribute ? attribute.stride : 0;
              return;
            }
            case 0x0D32: { // GL_MAX_CLIP_PLANES
              HEAP32[((params)>>2)] = GLEmulation.MAX_CLIP_PLANES; // all implementations need to support atleast 6
              return;
            }
            case 0x0BA0: { // GL_MATRIX_MODE
              HEAP32[((params)>>2)] = GLImmediate.currentMatrix + 0x1700;
              return;
            }
          }
          glGetIntegerv(pname, params);
        };
        
  
        var glGetString = _glGetString;
        _glGetString = _emscripten_glGetString = function _glGetString(name_) {
          if (GL.stringCache[name_]) return GL.stringCache[name_];
          switch (name_) {
            case 0x1F03 /* GL_EXTENSIONS */: // Add various extensions that we can support
              var ret = stringToNewUTF8((GLctx.getSupportedExtensions() || []).join(' ') +
                     ' GL_EXT_texture_env_combine GL_ARB_texture_env_crossbar GL_ATI_texture_env_combine3 GL_NV_texture_env_combine4 GL_EXT_texture_env_dot3 GL_ARB_multitexture GL_ARB_vertex_buffer_object GL_EXT_framebuffer_object GL_ARB_vertex_program GL_ARB_fragment_program GL_ARB_shading_language_100 GL_ARB_shader_objects GL_ARB_vertex_shader GL_ARB_fragment_shader GL_ARB_texture_cube_map GL_EXT_draw_range_elements' +
                     (GL.currentContext.compressionExt ? ' GL_ARB_texture_compression GL_EXT_texture_compression_s3tc' : '') +
                     (GL.currentContext.anisotropicExt ? ' GL_EXT_texture_filter_anisotropic' : '')
              );
              GL.stringCache[name_] = ret;
              return ret;
          }
          return glGetString(name_);
        };
        
  
        // Do some automatic rewriting to work around GLSL differences. Note that this must be done in
        // tandem with the rest of the program, by itself it cannot suffice.
        // Note that we need to remember shader types for this rewriting, saving sources makes it easier to debug.
        GL.shaderInfos = {};
        var glCreateShader = _glCreateShader;
        _glCreateShader = _emscripten_glCreateShader = function _glCreateShader(shaderType) {
          var id = glCreateShader(shaderType);
          GL.shaderInfos[id] = {
            type: shaderType,
            ftransform: false
          };
          return id;
        };
        
  
        function ensurePrecision(source) {
          if (!/precision +(low|medium|high)p +float *;/.test(source)) {
            source = '#ifdef GL_FRAGMENT_PRECISION_HIGH\nprecision highp float;\n#else\nprecision mediump float;\n#endif\n' + source;
          }
          return source;
        }
  
        var glShaderSource = _glShaderSource;
        _glShaderSource = _emscripten_glShaderSource = function _glShaderSource(shader, count, string, length) {
          var source = GL.getSource(shader, count, string, length);
          // XXX We add attributes and uniforms to shaders. The program can ask for the # of them, and see the
          // ones we generated, potentially confusing it? Perhaps we should hide them.
          if (GL.shaderInfos[shader].type == GLctx.VERTEX_SHADER) {
            // Replace ftransform() with explicit project/modelview transforms, and add position and matrix info.
            var has_pm = source.search(/u_projection/) >= 0;
            var has_mm = source.search(/u_modelView/) >= 0;
            var has_pv = source.search(/a_position/) >= 0;
            var need_pm = 0, need_mm = 0, need_pv = 0;
            var old = source;
            source = source.replace(/ftransform\(\)/g, '(u_projection * u_modelView * a_position)');
            if (old != source) need_pm = need_mm = need_pv = 1;
            old = source;
            source = source.replace(/gl_ProjectionMatrix/g, 'u_projection');
            if (old != source) need_pm = 1;
            old = source;
            source = source.replace(/gl_ModelViewMatrixTranspose\[2\]/g, 'vec4(u_modelView[0][2], u_modelView[1][2], u_modelView[2][2], u_modelView[3][2])'); // XXX extremely inefficient
            if (old != source) need_mm = 1;
            old = source;
            source = source.replace(/gl_ModelViewMatrix/g, 'u_modelView');
            if (old != source) need_mm = 1;
            old = source;
            source = source.replace(/gl_Vertex/g, 'a_position');
            if (old != source) need_pv = 1;
            old = source;
            source = source.replace(/gl_ModelViewProjectionMatrix/g, '(u_projection * u_modelView)');
            if (old != source) need_pm = need_mm = 1;
            if (need_pv && !has_pv) source = 'attribute vec4 a_position; \n' + source;
            if (need_mm && !has_mm) source = 'uniform mat4 u_modelView; \n' + source;
            if (need_pm && !has_pm) source = 'uniform mat4 u_projection; \n' + source;
            GL.shaderInfos[shader].ftransform = need_pm || need_mm || need_pv; // we will need to provide the fixed function stuff as attributes and uniforms
            for (var i = 0; i < GLImmediate.MAX_TEXTURES; i++) {
              // XXX To handle both regular texture mapping and cube mapping, we use vec4 for tex coordinates.
              old = source;
              var need_vtc = source.search('v_texCoord' + i) == -1;
              source = source.replace(new RegExp('gl_TexCoord\\[' + i + '\\]', 'g'), 'v_texCoord' + i)
                             .replace(new RegExp('gl_MultiTexCoord' + i, 'g'), 'a_texCoord' + i);
              if (source != old) {
                source = 'attribute vec4 a_texCoord' + i + '; \n' + source;
                if (need_vtc) {
                  source = 'varying vec4 v_texCoord' + i + ';   \n' + source;
                }
              }
  
              old = source;
              source = source.replace(new RegExp('gl_TextureMatrix\\[' + i + '\\]', 'g'), 'u_textureMatrix' + i);
              if (source != old) {
                source = 'uniform mat4 u_textureMatrix' + i + '; \n' + source;
              }
            }
            if (source.includes('gl_FrontColor')) {
              source = 'varying vec4 v_color; \n' +
                       source.replace(/gl_FrontColor/g, 'v_color');
            }
            if (source.includes('gl_Color')) {
              source = 'attribute vec4 a_color; \n' +
                       source.replace(/gl_Color/g, 'a_color');
            }
            if (source.includes('gl_Normal')) {
              source = 'attribute vec3 a_normal; \n' +
                       source.replace(/gl_Normal/g, 'a_normal');
            }
            // fog
            if (source.includes('gl_FogFragCoord')) {
              source = 'varying float v_fogFragCoord;   \n' +
                       source.replace(/gl_FogFragCoord/g, 'v_fogFragCoord');
            }
          } else { // Fragment shader
            for (i = 0; i < GLImmediate.MAX_TEXTURES; i++) {
              old = source;
              source = source.replace(new RegExp('gl_TexCoord\\[' + i + '\\]', 'g'), 'v_texCoord' + i);
              if (source != old) {
                source = 'varying vec4 v_texCoord' + i + ';   \n' + source;
              }
            }
            if (source.includes('gl_Color')) {
              source = 'varying vec4 v_color; \n' + source.replace(/gl_Color/g, 'v_color');
            }
            if (source.includes('gl_Fog.color')) {
              source = 'uniform vec4 u_fogColor;   \n' +
                       source.replace(/gl_Fog.color/g, 'u_fogColor');
            }
            if (source.includes('gl_Fog.end')) {
              source = 'uniform float u_fogEnd;   \n' +
                       source.replace(/gl_Fog.end/g, 'u_fogEnd');
            }
            if (source.includes('gl_Fog.scale')) {
              source = 'uniform float u_fogScale;   \n' +
                       source.replace(/gl_Fog.scale/g, 'u_fogScale');
            }
            if (source.includes('gl_Fog.density')) {
              source = 'uniform float u_fogDensity;   \n' +
                       source.replace(/gl_Fog.density/g, 'u_fogDensity');
            }
            if (source.includes('gl_FogFragCoord')) {
              source = 'varying float v_fogFragCoord;   \n' +
                       source.replace(/gl_FogFragCoord/g, 'v_fogFragCoord');
            }
            source = ensurePrecision(source);
          }
          GLctx.shaderSource(GL.shaders[shader], source);
        };
        
  
        var glCompileShader = _glCompileShader;
        _glCompileShader = _emscripten_glCompileShader = function _glCompileShader(shader) {
          GLctx.compileShader(GL.shaders[shader]);
        };
        
  
        GL.programShaders = {};
        var glAttachShader = _glAttachShader;
        _glAttachShader = _emscripten_glAttachShader = function _glAttachShader(program, shader) {
          if (!GL.programShaders[program]) GL.programShaders[program] = [];
          GL.programShaders[program].push(shader);
          glAttachShader(program, shader);
        };
        
  
        var glDetachShader = _glDetachShader;
        _glDetachShader = _emscripten_glDetachShader = function _glDetachShader(program, shader) {
          var programShader = GL.programShaders[program];
          if (!programShader) {
            err('WARNING: _glDetachShader received invalid program: ' + program);
            return;
          }
          var index = programShader.indexOf(shader);
          programShader.splice(index, 1);
          glDetachShader(program, shader);
        };
        
  
        var glUseProgram = _glUseProgram;
        _glUseProgram = _emscripten_glUseProgram = function _glUseProgram(program) {
          if (GL.currProgram != program) {
            GLImmediate.currentRenderer = null; // This changes the FFP emulation shader program, need to recompute that.
            GL.currProgram = program;
            GLImmediate.fixedFunctionProgram = 0;
            glUseProgram(program);
          }
        }
        
  
        var glDeleteProgram = _glDeleteProgram;
        _glDeleteProgram = _emscripten_glDeleteProgram = function _glDeleteProgram(program) {
          glDeleteProgram(program);
          if (program == GL.currProgram) {
            GLImmediate.currentRenderer = null; // This changes the FFP emulation shader program, need to recompute that.
            GL.currProgram = 0;
          }
        };
        
  
        // If attribute 0 was not bound, bind it to 0 for WebGL performance reasons. Track if 0 is free for that.
        var zeroUsedPrograms = {};
        var glBindAttribLocation = _glBindAttribLocation;
        _glBindAttribLocation = _emscripten_glBindAttribLocation = function _glBindAttribLocation(program, index, name) {
          if (index == 0) zeroUsedPrograms[program] = true;
          glBindAttribLocation(program, index, name);
        };
        
  
        var glLinkProgram = _glLinkProgram;
        _glLinkProgram = _emscripten_glLinkProgram = function _glLinkProgram(program) {
          if (!(program in zeroUsedPrograms)) {
            GLctx.bindAttribLocation(GL.programs[program], 0, 'a_position');
          }
          glLinkProgram(program);
        };
        
  
        var glBindBuffer = _glBindBuffer;
        _glBindBuffer = _emscripten_glBindBuffer = function _glBindBuffer(target, buffer) {
          glBindBuffer(target, buffer);
          if (target == GLctx.ARRAY_BUFFER) {
            if (GLEmulation.currentVao) {
              assert(GLEmulation.currentVao.arrayBuffer == buffer || GLEmulation.currentVao.arrayBuffer == 0 || buffer == 0, 'TODO: support for multiple array buffers in vao');
              GLEmulation.currentVao.arrayBuffer = buffer;
            }
          } else if (target == GLctx.ELEMENT_ARRAY_BUFFER) {
            if (GLEmulation.currentVao) GLEmulation.currentVao.elementArrayBuffer = buffer;
          }
        };
        
  
        var glGetFloatv = _glGetFloatv;
        _glGetFloatv = _emscripten_glGetFloatv = function _glGetFloatv(pname, params) {
          if (pname == 0xBA6) { // GL_MODELVIEW_MATRIX
            HEAPF32.set(GLImmediate.matrix[0/*m*/], params >> 2);
          } else if (pname == 0xBA7) { // GL_PROJECTION_MATRIX
            HEAPF32.set(GLImmediate.matrix[1/*p*/], params >> 2);
          } else if (pname == 0xBA8) { // GL_TEXTURE_MATRIX
            HEAPF32.set(GLImmediate.matrix[2/*t*/ + GLImmediate.clientActiveTexture], params >> 2);
          } else if (pname == 0xB66) { // GL_FOG_COLOR
            HEAPF32.set(GLEmulation.fogColor, params >> 2);
          } else if (pname == 0xB63) { // GL_FOG_START
            HEAPF32[((params)>>2)] = GLEmulation.fogStart;
          } else if (pname == 0xB64) { // GL_FOG_END
            HEAPF32[((params)>>2)] = GLEmulation.fogEnd;
          } else if (pname == 0xB62) { // GL_FOG_DENSITY
            HEAPF32[((params)>>2)] = GLEmulation.fogDensity;
          } else if (pname == 0xB65) { // GL_FOG_MODE
            HEAPF32[((params)>>2)] = GLEmulation.fogMode;
          } else if (pname == 0xB53) { // GL_LIGHT_MODEL_AMBIENT
            HEAPF32[((params)>>2)] = GLEmulation.lightModelAmbient[0];
            HEAPF32[(((params)+(4))>>2)] = GLEmulation.lightModelAmbient[1];
            HEAPF32[(((params)+(8))>>2)] = GLEmulation.lightModelAmbient[2];
            HEAPF32[(((params)+(12))>>2)] = GLEmulation.lightModelAmbient[3];
          } else {
            glGetFloatv(pname, params);
          }
        };
        
  
        var glHint = _glHint;
        _glHint = _emscripten_glHint = function _glHint(target, mode) {
          if (target == 0x84EF) { // GL_TEXTURE_COMPRESSION_HINT
            return;
          }
          glHint(target, mode);
        };
        
  
        var glEnableVertexAttribArray = _glEnableVertexAttribArray;
        _glEnableVertexAttribArray = _emscripten_glEnableVertexAttribArray = function _glEnableVertexAttribArray(index) {
          glEnableVertexAttribArray(index);
          GLEmulation.enabledVertexAttribArrays[index] = 1;
          if (GLEmulation.currentVao) GLEmulation.currentVao.enabledVertexAttribArrays[index] = 1;
        };
        
  
        var glDisableVertexAttribArray = _glDisableVertexAttribArray;
        _glDisableVertexAttribArray = _emscripten_glDisableVertexAttribArray = function _glDisableVertexAttribArray(index) {
          glDisableVertexAttribArray(index);
          delete GLEmulation.enabledVertexAttribArrays[index];
          if (GLEmulation.currentVao) delete GLEmulation.currentVao.enabledVertexAttribArrays[index];
        };
        
  
        var glVertexAttribPointer = _glVertexAttribPointer;
        _glVertexAttribPointer = _emscripten_glVertexAttribPointer = function _glVertexAttribPointer(index, size, type, normalized, stride, pointer) {
          glVertexAttribPointer(index, size, type, normalized, stride, pointer);
          if (GLEmulation.currentVao) { // TODO: avoid object creation here? likely not hot though
            GLEmulation.currentVao.vertexAttribPointers[index] = [index, size, type, normalized, stride, pointer];
          }
        };
        
      },getAttributeFromCapability:function(cap) {
        var attrib = null;
        switch (cap) {
          case 0xDE1: // GL_TEXTURE_2D - XXX not according to spec, and not in desktop GL, but works in some GLES1.x apparently, so support it
            abort("GL_TEXTURE_2D is not a spec-defined capability for gl{Enable,Disable}ClientState.");
            // Fall through:
          case 0x8078: // GL_TEXTURE_COORD_ARRAY
            attrib = GLImmediate.TEXTURE0 + GLImmediate.clientActiveTexture; break;
          case 0x8074: // GL_VERTEX_ARRAY
            attrib = GLImmediate.VERTEX; break;
          case 0x8075: // GL_NORMAL_ARRAY
            attrib = GLImmediate.NORMAL; break;
          case 0x8076: // GL_COLOR_ARRAY
            attrib = GLImmediate.COLOR; break;
        }
        return attrib;
      }};
  var GLImmediate={MapTreeLib:null,spawnMapTreeLib:function() {
        /* A naive implementation of a map backed by an array, and accessed by
         * naive iteration along the array. (hashmap with only one bucket)
         */
        function CNaiveListMap() {
          var list = [];
  
          this.insert = function CNaiveListMap_insert(key, val) {
            if (this.contains(key|0)) return false;
            list.push([key, val]);
            return true;
          };
  
          var __contains_i;
          this.contains = function CNaiveListMap_contains(key) {
            for (__contains_i = 0; __contains_i < list.length; ++__contains_i) {
              if (list[__contains_i][0] === key) return true;
            }
            return false;
          };
  
          var __get_i;
          this.get = function CNaiveListMap_get(key) {
            for (__get_i = 0; __get_i < list.length; ++__get_i) {
              if (list[__get_i][0] === key) return list[__get_i][1];
            }
            return undefined;
          };
        };
  
        /* A tree of map nodes.
          Uses `KeyView`s to allow descending the tree without garbage.
          Example: {
            // Create our map object.
            var map = new ObjTreeMap();
  
            // Grab the static keyView for the map.
            var keyView = map.GetStaticKeyView();
  
            // Let's make a map for:
            // root: <undefined>
            //   1: <undefined>
            //     2: <undefined>
            //       5: "Three, sir!"
            //       3: "Three!"
  
            // Note how we can chain together `Reset` and `Next` to
            // easily descend based on multiple key fragments.
            keyView.Reset().Next(1).Next(2).Next(5).Set("Three, sir!");
            keyView.Reset().Next(1).Next(2).Next(3).Set("Three!");
          }
        */
        function CMapTree() {
          function CNLNode() {
            var map = new CNaiveListMap();
  
            this.child = function CNLNode_child(keyFrag) {
              if (!map.contains(keyFrag|0)) {
                map.insert(keyFrag|0, new CNLNode());
              }
              return map.get(keyFrag|0);
            };
  
            this.value = undefined;
            this.get = function CNLNode_get() {
              return this.value;
            };
  
            this.set = function CNLNode_set(val) {
              this.value = val;
            };
          }
  
          function CKeyView(root) {
            var cur;
  
            this.reset = function CKeyView_reset() {
              cur = root;
              return this;
            };
            this.reset();
  
            this.next = function CKeyView_next(keyFrag) {
              cur = cur.child(keyFrag);
              return this;
            };
  
            this.get = function CKeyView_get() {
              return cur.get();
            };
  
            this.set = function CKeyView_set(val) {
              cur.set(val);
            };
          };
  
          var root;
          var staticKeyView;
  
          this.createKeyView = function CNLNode_createKeyView() {
            return new CKeyView(root);
          }
  
          this.clear = function CNLNode_clear() {
            root = new CNLNode();
            staticKeyView = this.createKeyView();
          };
          this.clear();
  
          this.getStaticKeyView = function CNLNode_getStaticKeyView() {
            staticKeyView.reset();
            return staticKeyView;
          };
        };
  
        // Exports:
        return {
          create: function() {
            return new CMapTree();
          },
        };
      },TexEnvJIT:null,spawnTexEnvJIT:function() {
        // GL defs:
        var GL_TEXTURE0 = 0x84C0;
        var GL_TEXTURE_1D = 0xDE0;
        var GL_TEXTURE_2D = 0xDE1;
        var GL_TEXTURE_3D = 0x806f;
        var GL_TEXTURE_CUBE_MAP = 0x8513;
        var GL_TEXTURE_ENV = 0x2300;
        var GL_TEXTURE_ENV_MODE = 0x2200;
        var GL_TEXTURE_ENV_COLOR = 0x2201;
        var GL_TEXTURE_CUBE_MAP_POSITIVE_X = 0x8515;
        var GL_TEXTURE_CUBE_MAP_NEGATIVE_X = 0x8516;
        var GL_TEXTURE_CUBE_MAP_POSITIVE_Y = 0x8517;
        var GL_TEXTURE_CUBE_MAP_NEGATIVE_Y = 0x8518;
        var GL_TEXTURE_CUBE_MAP_POSITIVE_Z = 0x8519;
        var GL_TEXTURE_CUBE_MAP_NEGATIVE_Z = 0x851A;
  
        var GL_SRC0_RGB = 0x8580;
        var GL_SRC1_RGB = 0x8581;
        var GL_SRC2_RGB = 0x8582;
  
        var GL_SRC0_ALPHA = 0x8588;
        var GL_SRC1_ALPHA = 0x8589;
        var GL_SRC2_ALPHA = 0x858A;
  
        var GL_OPERAND0_RGB = 0x8590;
        var GL_OPERAND1_RGB = 0x8591;
        var GL_OPERAND2_RGB = 0x8592;
  
        var GL_OPERAND0_ALPHA = 0x8598;
        var GL_OPERAND1_ALPHA = 0x8599;
        var GL_OPERAND2_ALPHA = 0x859A;
  
        var GL_COMBINE_RGB = 0x8571;
        var GL_COMBINE_ALPHA = 0x8572;
  
        var GL_RGB_SCALE = 0x8573;
        var GL_ALPHA_SCALE = 0xD1C;
  
        // env.mode
        var GL_ADD      = 0x104;
        var GL_BLEND    = 0xBE2;
        var GL_REPLACE  = 0x1E01;
        var GL_MODULATE = 0x2100;
        var GL_DECAL    = 0x2101;
        var GL_COMBINE  = 0x8570;
  
        // env.color/alphaCombiner
        //var GL_ADD         = 0x104;
        //var GL_REPLACE     = 0x1E01;
        //var GL_MODULATE    = 0x2100;
        var GL_SUBTRACT    = 0x84E7;
        var GL_INTERPOLATE = 0x8575;
  
        // env.color/alphaSrc
        var GL_TEXTURE       = 0x1702;
        var GL_CONSTANT      = 0x8576;
        var GL_PRIMARY_COLOR = 0x8577;
        var GL_PREVIOUS      = 0x8578;
  
        // env.color/alphaOp
        var GL_SRC_COLOR           = 0x300;
        var GL_ONE_MINUS_SRC_COLOR = 0x301;
        var GL_SRC_ALPHA           = 0x302;
        var GL_ONE_MINUS_SRC_ALPHA = 0x303;
  
        var GL_RGB  = 0x1907;
        var GL_RGBA = 0x1908;
  
        // Our defs:
        var TEXENVJIT_NAMESPACE_PREFIX = "tej_";
        // Not actually constant, as they can be changed between JIT passes:
        var TEX_UNIT_UNIFORM_PREFIX = "uTexUnit";
        var TEX_COORD_VARYING_PREFIX = "vTexCoord";
        var PRIM_COLOR_VARYING = "vPrimColor";
        var TEX_MATRIX_UNIFORM_PREFIX = "uTexMatrix";
  
        // Static vars:
        var s_texUnits = null; //[];
        var s_activeTexture = 0;
  
        var s_requiredTexUnitsForPass = [];
  
        // Static funcs:
        function abort(info) {
          assert(false, "[TexEnvJIT] ABORT: " + info);
        }
  
        function abort_noSupport(info) {
          abort("No support: " + info);
        }
  
        function abort_sanity(info) {
          abort("Sanity failure: " + info);
        }
  
        function genTexUnitSampleExpr(texUnitID) {
          var texUnit = s_texUnits[texUnitID];
          var texType = texUnit.getTexType();
  
          var func = null;
          switch (texType) {
            case GL_TEXTURE_1D:
              func = "texture2D";
              break;
            case GL_TEXTURE_2D:
              func = "texture2D";
              break;
            case GL_TEXTURE_3D:
              return abort_noSupport("No support for 3D textures.");
            case GL_TEXTURE_CUBE_MAP:
              func = "textureCube";
              break;
            default:
              return abort_sanity("Unknown texType: 0x" + texType.toString(16));
          }
  
          var texCoordExpr = TEX_COORD_VARYING_PREFIX + texUnitID;
          if (TEX_MATRIX_UNIFORM_PREFIX != null) {
            texCoordExpr = "(" + TEX_MATRIX_UNIFORM_PREFIX + texUnitID + " * " + texCoordExpr + ")";
          }
          return func + "(" + TEX_UNIT_UNIFORM_PREFIX + texUnitID + ", " + texCoordExpr + ".xy)";
        }
  
        function getTypeFromCombineOp(op) {
          switch (op) {
            case GL_SRC_COLOR:
            case GL_ONE_MINUS_SRC_COLOR:
              return "vec3";
            case GL_SRC_ALPHA:
            case GL_ONE_MINUS_SRC_ALPHA:
              return "float";
          }
  
          return abort_noSupport("Unsupported combiner op: 0x" + op.toString(16));
        }
  
        function getCurTexUnit() {
          return s_texUnits[s_activeTexture];
        }
  
        function genCombinerSourceExpr(texUnitID, constantExpr, previousVar,
                                       src, op)
        {
          var srcExpr = null;
          switch (src) {
            case GL_TEXTURE:
              srcExpr = genTexUnitSampleExpr(texUnitID);
              break;
            case GL_CONSTANT:
              srcExpr = constantExpr;
              break;
            case GL_PRIMARY_COLOR:
              srcExpr = PRIM_COLOR_VARYING;
              break;
            case GL_PREVIOUS:
              srcExpr = previousVar;
              break;
            default:
                return abort_noSupport("Unsupported combiner src: 0x" + src.toString(16));
          }
  
          var expr = null;
          switch (op) {
            case GL_SRC_COLOR:
              expr = srcExpr + ".rgb";
              break;
            case GL_ONE_MINUS_SRC_COLOR:
              expr = "(vec3(1.0) - " + srcExpr + ".rgb)";
              break;
            case GL_SRC_ALPHA:
              expr = srcExpr + ".a";
              break;
            case GL_ONE_MINUS_SRC_ALPHA:
              expr = "(1.0 - " + srcExpr + ".a)";
              break;
            default:
              return abort_noSupport("Unsupported combiner op: 0x" + op.toString(16));
          }
  
          return expr;
        }
  
        function valToFloatLiteral(val) {
          if (val == Math.round(val)) return val + '.0';
          return val;
        }
  
        // Classes:
        function CTexEnv() {
          this.mode = GL_MODULATE;
          this.colorCombiner = GL_MODULATE;
          this.alphaCombiner = GL_MODULATE;
          this.colorScale = 1;
          this.alphaScale = 1;
          this.envColor = [0, 0, 0, 0];
  
          this.colorSrc = [
            GL_TEXTURE,
            GL_PREVIOUS,
            GL_CONSTANT
          ];
          this.alphaSrc = [
            GL_TEXTURE,
            GL_PREVIOUS,
            GL_CONSTANT
          ];
          this.colorOp = [
            GL_SRC_COLOR,
            GL_SRC_COLOR,
            GL_SRC_ALPHA
          ];
          this.alphaOp = [
            GL_SRC_ALPHA,
            GL_SRC_ALPHA,
            GL_SRC_ALPHA
          ];
  
          // Map GLenums to small values to efficiently pack the enums to bits for tighter access.
          this.traverseKey = {
            // mode
            0x1E01 /* GL_REPLACE */: 0,
            0x2100 /* GL_MODULATE */: 1,
            0x104 /* GL_ADD */: 2,
            0xBE2 /* GL_BLEND */: 3,
            0x2101 /* GL_DECAL */: 4,
            0x8570 /* GL_COMBINE */: 5,
  
            // additional color and alpha combiners
            0x84E7 /* GL_SUBTRACT */: 3,
            0x8575 /* GL_INTERPOLATE */: 4,
  
            // color and alpha src
            0x1702 /* GL_TEXTURE */: 0,
            0x8576 /* GL_CONSTANT */: 1,
            0x8577 /* GL_PRIMARY_COLOR */: 2,
            0x8578 /* GL_PREVIOUS */: 3,
  
            // color and alpha op
            0x300 /* GL_SRC_COLOR */: 0,
            0x301 /* GL_ONE_MINUS_SRC_COLOR */: 1,
            0x302 /* GL_SRC_ALPHA */: 2,
            0x303 /* GL_ONE_MINUS_SRC_ALPHA */: 3
          };
  
          // The tuple (key0,key1,key2) uniquely identifies the state of the variables in CTexEnv.
          // -1 on key0 denotes 'the whole cached key is dirty'
          this.key0 = -1;
          this.key1 = 0;
          this.key2 = 0;
  
          this.computeKey0 = function() {
            var k = this.traverseKey;
            var key = k[this.mode] * 1638400; // 6 distinct values.
            key += k[this.colorCombiner] * 327680; // 5 distinct values.
            key += k[this.alphaCombiner] * 65536; // 5 distinct values.
            // The above three fields have 6*5*5=150 distinct values -> 8 bits.
            key += (this.colorScale-1) * 16384; // 10 bits used.
            key += (this.alphaScale-1) * 4096; // 12 bits used.
            key += k[this.colorSrc[0]] * 1024; // 14
            key += k[this.colorSrc[1]] * 256; // 16
            key += k[this.colorSrc[2]] * 64; // 18
            key += k[this.alphaSrc[0]] * 16; // 20
            key += k[this.alphaSrc[1]] * 4; // 22
            key += k[this.alphaSrc[2]]; // 24 bits used total.
            return key;
          }
          this.computeKey1 = function() {
            var k = this.traverseKey;
            key = k[this.colorOp[0]] * 4096;
            key += k[this.colorOp[1]] * 1024;
            key += k[this.colorOp[2]] * 256;
            key += k[this.alphaOp[0]] * 16;
            key += k[this.alphaOp[1]] * 4;
            key += k[this.alphaOp[2]];
            return key;
          }
          // TODO: remove this. The color should not be part of the key!
          this.computeKey2 = function() {
            return this.envColor[0] * 16777216 + this.envColor[1] * 65536 + this.envColor[2] * 256 + 1 + this.envColor[3];
          }
          this.recomputeKey = function() {
            this.key0 = this.computeKey0();
            this.key1 = this.computeKey1();
            this.key2 = this.computeKey2();
          }
          this.invalidateKey = function() {
            this.key0 = -1; // The key of this texture unit must be recomputed when rendering the next time.
            GLImmediate.currentRenderer = null; // The currently used renderer must be re-evaluated at next render.
          }
        }
  
        function CTexUnit() {
          this.env = new CTexEnv();
          this.enabled_tex1D   = false;
          this.enabled_tex2D   = false;
          this.enabled_tex3D   = false;
          this.enabled_texCube = false;
          this.texTypesEnabled = 0; // A bitfield combination of the four flags above, used for fast access to operations.
  
          this.traverseState = function CTexUnit_traverseState(keyView) {
            if (this.texTypesEnabled) {
              if (this.env.key0 == -1) {
                this.env.recomputeKey();
              }
              keyView.next(this.texTypesEnabled | (this.env.key0 << 4));
              keyView.next(this.env.key1);
              keyView.next(this.env.key2);
            } else {
              // For correctness, must traverse a zero value, theoretically a subsequent integer key could collide with this value otherwise.
              keyView.next(0);
            }
          };
        };
  
        // Class impls:
        CTexUnit.prototype.enabled = function CTexUnit_enabled() {
          return this.texTypesEnabled;
        }
  
        CTexUnit.prototype.genPassLines = function CTexUnit_genPassLines(passOutputVar, passInputVar, texUnitID) {
          if (!this.enabled()) {
            return ["vec4 " + passOutputVar + " = " + passInputVar + ";"];
          }
          var lines = this.env.genPassLines(passOutputVar, passInputVar, texUnitID).join('\n');
  
          var texLoadLines = '';
          var texLoadRegex = /(texture.*?\(.*?\))/g;
          var loadCounter = 0;
          var load;
  
          // As an optimization, merge duplicate identical texture loads to one var.
          while (load = texLoadRegex.exec(lines)) {
            var texLoadExpr = load[1];
            var secondOccurrence = lines.slice(load.index+1).indexOf(texLoadExpr);
            if (secondOccurrence != -1) { // And also has a second occurrence of same load expression..
              // Create new var to store the common load.
              var prefix = TEXENVJIT_NAMESPACE_PREFIX + 'env' + texUnitID + "_";
              var texLoadVar = prefix + 'texload' + loadCounter++;
              var texLoadLine = 'vec4 ' + texLoadVar + ' = ' + texLoadExpr + ';\n';
              texLoadLines += texLoadLine + '\n'; // Store the generated texture load statements in a temp string to not confuse regex search in progress.
              lines = lines.split(texLoadExpr).join(texLoadVar);
              // Reset regex search, since we modified the string.
              texLoadRegex = /(texture.*\(.*\))/g;
            }
          }
          return [texLoadLines + lines];
        }
  
        CTexUnit.prototype.getTexType = function CTexUnit_getTexType() {
          if (this.enabled_texCube) {
            return GL_TEXTURE_CUBE_MAP;
          } else if (this.enabled_tex3D) {
            return GL_TEXTURE_3D;
          } else if (this.enabled_tex2D) {
            return GL_TEXTURE_2D;
          } else if (this.enabled_tex1D) {
            return GL_TEXTURE_1D;
          }
          return 0;
        }
  
        CTexEnv.prototype.genPassLines = function CTexEnv_genPassLines(passOutputVar, passInputVar, texUnitID) {
          switch (this.mode) {
            case GL_REPLACE: {
              /* RGB:
               * Cv = Cs
               * Av = Ap // Note how this is different, and that we'll
               *            need to track the bound texture internalFormat
               *            to get this right.
               *
               * RGBA:
               * Cv = Cs
               * Av = As
               */
              return [
                "vec4 " + passOutputVar + " = " + genTexUnitSampleExpr(texUnitID) + ";",
              ];
            }
            case GL_ADD: {
              /* RGBA:
               * Cv = Cp + Cs
               * Av = ApAs
               */
              var prefix = TEXENVJIT_NAMESPACE_PREFIX + 'env' + texUnitID + "_";
              var texVar = prefix + "tex";
              var colorVar = prefix + "color";
              var alphaVar = prefix + "alpha";
  
              return [
                "vec4 " + texVar + " = " + genTexUnitSampleExpr(texUnitID) + ";",
                "vec3 " + colorVar + " = " + passInputVar + ".rgb + " + texVar + ".rgb;",
                "float " + alphaVar + " = " + passInputVar + ".a * " + texVar + ".a;",
                "vec4 " + passOutputVar + " = vec4(" + colorVar + ", " + alphaVar + ");",
              ];
            }
            case GL_MODULATE: {
              /* RGBA:
               * Cv = CpCs
               * Av = ApAs
               */
              var line = [
                "vec4 " + passOutputVar,
                " = ",
                  passInputVar,
                  " * ",
                  genTexUnitSampleExpr(texUnitID),
                ";",
              ];
              return [line.join("")];
            }
            case GL_DECAL: {
              /* RGBA:
               * Cv = Cp(1 - As) + CsAs
               * Av = Ap
               */
              var prefix = TEXENVJIT_NAMESPACE_PREFIX + 'env' + texUnitID + "_";
              var texVar = prefix + "tex";
              var colorVar = prefix + "color";
              var alphaVar = prefix + "alpha";
  
              return [
                "vec4 " + texVar + " = " + genTexUnitSampleExpr(texUnitID) + ";",
                [
                  "vec3 " + colorVar + " = ",
                    passInputVar + ".rgb * (1.0 - " + texVar + ".a)",
                      " + ",
                    texVar + ".rgb * " + texVar + ".a",
                  ";"
                ].join(""),
                "float " + alphaVar + " = " + passInputVar + ".a;",
                "vec4 " + passOutputVar + " = vec4(" + colorVar + ", " + alphaVar + ");",
              ];
            }
            case GL_BLEND: {
              /* RGBA:
               * Cv = Cp(1 - Cs) + CcCs
               * Av = As
               */
              var prefix = TEXENVJIT_NAMESPACE_PREFIX + 'env' + texUnitID + "_";
              var texVar = prefix + "tex";
              var colorVar = prefix + "color";
              var alphaVar = prefix + "alpha";
  
              return [
                "vec4 " + texVar + " = " + genTexUnitSampleExpr(texUnitID) + ";",
                [
                  "vec3 " + colorVar + " = ",
                    passInputVar + ".rgb * (1.0 - " + texVar + ".rgb)",
                      " + ",
                    PRIM_COLOR_VARYING + ".rgb * " + texVar + ".rgb",
                  ";"
                ].join(""),
                "float " + alphaVar + " = " + texVar + ".a;",
                "vec4 " + passOutputVar + " = vec4(" + colorVar + ", " + alphaVar + ");",
              ];
            }
            case GL_COMBINE: {
              var prefix = TEXENVJIT_NAMESPACE_PREFIX + 'env' + texUnitID + "_";
              var colorVar = prefix + "color";
              var alphaVar = prefix + "alpha";
              var colorLines = this.genCombinerLines(true, colorVar,
                                                     passInputVar, texUnitID,
                                                     this.colorCombiner, this.colorSrc, this.colorOp);
              var alphaLines = this.genCombinerLines(false, alphaVar,
                                                     passInputVar, texUnitID,
                                                     this.alphaCombiner, this.alphaSrc, this.alphaOp);
  
              // Generate scale, but avoid generating an identity op that multiplies by one.
              var scaledColor = (this.colorScale == 1) ? colorVar : (colorVar + " * " + valToFloatLiteral(this.colorScale));
              var scaledAlpha = (this.alphaScale == 1) ? alphaVar : (alphaVar + " * " + valToFloatLiteral(this.alphaScale));
  
              var line = [
                "vec4 " + passOutputVar,
                " = ",
                  "vec4(",
                      scaledColor,
                      ", ",
                      scaledAlpha,
                  ")",
                ";",
              ].join("");
              return [].concat(colorLines, alphaLines, [line]);
            }
          }
  
          return abort_noSupport("Unsupported TexEnv mode: 0x" + this.mode.toString(16));
        }
  
        CTexEnv.prototype.genCombinerLines = function CTexEnv_getCombinerLines(isColor, outputVar,
                                                                               passInputVar, texUnitID,
                                                                               combiner, srcArr, opArr)
        {
          var argsNeeded = null;
          switch (combiner) {
            case GL_REPLACE:
              argsNeeded = 1;
              break;
  
            case GL_MODULATE:
            case GL_ADD:
            case GL_SUBTRACT:
              argsNeeded = 2;
              break;
  
            case GL_INTERPOLATE:
              argsNeeded = 3;
              break;
  
            default:
              return abort_noSupport("Unsupported combiner: 0x" + combiner.toString(16));
          }
  
          var constantExpr = [
            "vec4(",
              valToFloatLiteral(this.envColor[0]),
              ", ",
              valToFloatLiteral(this.envColor[1]),
              ", ",
              valToFloatLiteral(this.envColor[2]),
              ", ",
              valToFloatLiteral(this.envColor[3]),
            ")",
          ].join("");
          var src0Expr = (argsNeeded >= 1) ? genCombinerSourceExpr(texUnitID, constantExpr, passInputVar, srcArr[0], opArr[0])
                                           : null;
          var src1Expr = (argsNeeded >= 2) ? genCombinerSourceExpr(texUnitID, constantExpr, passInputVar, srcArr[1], opArr[1])
                                           : null;
          var src2Expr = (argsNeeded >= 3) ? genCombinerSourceExpr(texUnitID, constantExpr, passInputVar, srcArr[2], opArr[2])
                                           : null;
  
          var outputType = isColor ? "vec3" : "float";
          var lines = null;
          switch (combiner) {
            case GL_REPLACE: {
              var line = [
                outputType + " " + outputVar,
                " = ",
                  src0Expr,
                ";",
              ];
              lines = [line.join("")];
              break;
            }
            case GL_MODULATE: {
              var line = [
                outputType + " " + outputVar + " = ",
                  src0Expr + " * " + src1Expr,
                ";",
              ];
              lines = [line.join("")];
              break;
            }
            case GL_ADD: {
              var line = [
                outputType + " " + outputVar + " = ",
                  src0Expr + " + " + src1Expr,
                ";",
              ];
              lines = [line.join("")];
              break;
            }
            case GL_SUBTRACT: {
              var line = [
                outputType + " " + outputVar + " = ",
                  src0Expr + " - " + src1Expr,
                ";",
              ];
              lines = [line.join("")];
              break;
            }
            case GL_INTERPOLATE: {
              var prefix = TEXENVJIT_NAMESPACE_PREFIX + 'env' + texUnitID + "_";
              var arg2Var = prefix + "colorSrc2";
              var arg2Line = getTypeFromCombineOp(this.colorOp[2]) + " " + arg2Var + " = " + src2Expr + ";";
  
              var line = [
                outputType + " " + outputVar,
                " = ",
                  src0Expr + " * " + arg2Var,
                  " + ",
                  src1Expr + " * (1.0 - " + arg2Var + ")",
                ";",
              ];
              lines = [
                arg2Line,
                line.join(""),
              ];
              break;
            }
  
            default:
              return abort_sanity("Unmatched TexEnv.colorCombiner?");
          }
  
          return lines;
        }
  
        return {
          // Exports:
          init: function(gl, specifiedMaxTextureImageUnits) {
            var maxTexUnits = 0;
            if (specifiedMaxTextureImageUnits) {
              maxTexUnits = specifiedMaxTextureImageUnits;
            } else if (gl) {
              maxTexUnits = gl.getParameter(gl.MAX_TEXTURE_IMAGE_UNITS);
            }
            assert(maxTexUnits > 0);
            s_texUnits = [];
            for (var i = 0; i < maxTexUnits; i++) {
              s_texUnits.push(new CTexUnit());
            }
          },
  
          setGLSLVars: function(uTexUnitPrefix, vTexCoordPrefix, vPrimColor, uTexMatrixPrefix) {
            TEX_UNIT_UNIFORM_PREFIX   = uTexUnitPrefix;
            TEX_COORD_VARYING_PREFIX  = vTexCoordPrefix;
            PRIM_COLOR_VARYING        = vPrimColor;
            TEX_MATRIX_UNIFORM_PREFIX = uTexMatrixPrefix;
          },
  
          genAllPassLines: function(resultDest, indentSize) {
            indentSize = indentSize || 0;
  
            s_requiredTexUnitsForPass.length = 0; // Clear the list.
            var lines = [];
            var lastPassVar = PRIM_COLOR_VARYING;
            for (var i = 0; i < s_texUnits.length; i++) {
              if (!s_texUnits[i].enabled()) continue;
  
              s_requiredTexUnitsForPass.push(i);
  
              var prefix = TEXENVJIT_NAMESPACE_PREFIX + 'env' + i + "_";
              var passOutputVar = prefix + "result";
  
              var newLines = s_texUnits[i].genPassLines(passOutputVar, lastPassVar, i);
              lines = lines.concat(newLines, [""]);
  
              lastPassVar = passOutputVar;
            }
            lines.push(resultDest + " = " + lastPassVar + ";");
  
            var indent = "";
            for (var i = 0; i < indentSize; i++) indent += " ";
  
            var output = indent + lines.join("\n" + indent);
  
            return output;
          },
  
          getUsedTexUnitList: function() {
            return s_requiredTexUnitsForPass;
          },
  
          getActiveTexture: function () {
            return s_activeTexture;
          },
  
          traverseState: function(keyView) {
            for (var i = 0; i < s_texUnits.length; i++) {
              s_texUnits[i].traverseState(keyView);
            }
          },
  
          getTexUnitType: function(texUnitID) {
            assert(texUnitID >= 0 &&
                   texUnitID < s_texUnits.length);
            return s_texUnits[texUnitID].getTexType();
          },
  
          // Hooks:
          hook_activeTexture: function(texture) {
            s_activeTexture = texture - GL_TEXTURE0;
            // Check if the current matrix mode is GL_TEXTURE.
            if (GLImmediate.currentMatrix >= 2) {
              // Switch to the corresponding texture matrix stack.
              GLImmediate.currentMatrix = 2 + s_activeTexture;
            }
          },
  
          hook_enable: function(cap) {
            var cur = getCurTexUnit();
            switch (cap) {
              case GL_TEXTURE_1D:
                if (!cur.enabled_tex1D) {
                  GLImmediate.currentRenderer = null; // Renderer state changed, and must be recreated or looked up again.
                  cur.enabled_tex1D = true;
                  cur.texTypesEnabled |= 1;
                }
                break;
              case GL_TEXTURE_2D:
                if (!cur.enabled_tex2D) {
                  GLImmediate.currentRenderer = null;
                  cur.enabled_tex2D = true;
                  cur.texTypesEnabled |= 2;
                }
                break;
              case GL_TEXTURE_3D:
                if (!cur.enabled_tex3D) {
                  GLImmediate.currentRenderer = null;
                  cur.enabled_tex3D = true;
                  cur.texTypesEnabled |= 4;
                }
                break;
              case GL_TEXTURE_CUBE_MAP:
                if (!cur.enabled_texCube) {
                  GLImmediate.currentRenderer = null;
                  cur.enabled_texCube = true;
                  cur.texTypesEnabled |= 8;
                }
                break;
            }
          },
  
          hook_disable: function(cap) {
            var cur = getCurTexUnit();
            switch (cap) {
              case GL_TEXTURE_1D:
                if (cur.enabled_tex1D) {
                  GLImmediate.currentRenderer = null; // Renderer state changed, and must be recreated or looked up again.
                  cur.enabled_tex1D = false;
                  cur.texTypesEnabled &= ~1;
                }
                break;
              case GL_TEXTURE_2D:
                if (cur.enabled_tex2D) {
                  GLImmediate.currentRenderer = null;
                  cur.enabled_tex2D = false;
                  cur.texTypesEnabled &= ~2;
                }
                break;
              case GL_TEXTURE_3D:
                if (cur.enabled_tex3D) {
                  GLImmediate.currentRenderer = null;
                  cur.enabled_tex3D = false;
                  cur.texTypesEnabled &= ~4;
                }
                break;
              case GL_TEXTURE_CUBE_MAP:
                if (cur.enabled_texCube) {
                  GLImmediate.currentRenderer = null;
                  cur.enabled_texCube = false;
                  cur.texTypesEnabled &= ~8;
                }
                break;
            }
          },
  
          hook_texEnvf: function(target, pname, param) {
            if (target != GL_TEXTURE_ENV)
              return;
  
            var env = getCurTexUnit().env;
            switch (pname) {
              case GL_RGB_SCALE:
                if (env.colorScale != param) {
                  env.invalidateKey(); // We changed FFP emulation renderer state.
                  env.colorScale = param;
                }
                break;
              case GL_ALPHA_SCALE:
                if (env.alphaScale != param) {
                  env.invalidateKey();
                  env.alphaScale = param;
                }
                break;
  
              default:
                err('WARNING: Unhandled `pname` in call to `glTexEnvf`.');
            }
          },
  
          hook_texEnvi: function(target, pname, param) {
            if (target != GL_TEXTURE_ENV)
              return;
  
            var env = getCurTexUnit().env;
            switch (pname) {
              case GL_TEXTURE_ENV_MODE:
                if (env.mode != param) {
                  env.invalidateKey(); // We changed FFP emulation renderer state.
                  env.mode = param;
                }
                break;
  
              case GL_COMBINE_RGB:
                if (env.colorCombiner != param) {
                  env.invalidateKey();
                  env.colorCombiner = param;
                }
                break;
              case GL_COMBINE_ALPHA:
                if (env.alphaCombiner != param) {
                  env.invalidateKey();
                  env.alphaCombiner = param;
                }
                break;
  
              case GL_SRC0_RGB:
                if (env.colorSrc[0] != param) {
                  env.invalidateKey();
                  env.colorSrc[0] = param;
                }
                break;
              case GL_SRC1_RGB:
                if (env.colorSrc[1] != param) {
                  env.invalidateKey();
                  env.colorSrc[1] = param;
                }
                break;
              case GL_SRC2_RGB:
                if (env.colorSrc[2] != param) {
                  env.invalidateKey();
                  env.colorSrc[2] = param;
                }
                break;
  
              case GL_SRC0_ALPHA:
                if (env.alphaSrc[0] != param) {
                  env.invalidateKey();
                  env.alphaSrc[0] = param;
                }
                break;
              case GL_SRC1_ALPHA:
                if (env.alphaSrc[1] != param) {
                  env.invalidateKey();
                  env.alphaSrc[1] = param;
                }
                break;
              case GL_SRC2_ALPHA:
                if (env.alphaSrc[2] != param) {
                  env.invalidateKey();
                  env.alphaSrc[2] = param;
                }
                break;
  
              case GL_OPERAND0_RGB:
                if (env.colorOp[0] != param) {
                  env.invalidateKey();
                  env.colorOp[0] = param;
                }
                break;
              case GL_OPERAND1_RGB:
                if (env.colorOp[1] != param) {
                  env.invalidateKey();
                  env.colorOp[1] = param;
                }
                break;
              case GL_OPERAND2_RGB:
                if (env.colorOp[2] != param) {
                  env.invalidateKey();
                  env.colorOp[2] = param;
                }
                break;
  
              case GL_OPERAND0_ALPHA:
                if (env.alphaOp[0] != param) {
                  env.invalidateKey();
                  env.alphaOp[0] = param;
                }
                break;
              case GL_OPERAND1_ALPHA:
                if (env.alphaOp[1] != param) {
                  env.invalidateKey();
                  env.alphaOp[1] = param;
                }
                break;
              case GL_OPERAND2_ALPHA:
                if (env.alphaOp[2] != param) {
                  env.invalidateKey();
                  env.alphaOp[2] = param;
                }
                break;
  
              case GL_RGB_SCALE:
                if (env.colorScale != param) {
                  env.invalidateKey();
                  env.colorScale = param;
                }
                break;
              case GL_ALPHA_SCALE:
                if (env.alphaScale != param) {
                  env.invalidateKey();
                  env.alphaScale = param;
                }
                break;
  
              default:
                err('WARNING: Unhandled `pname` in call to `glTexEnvi`.');
            }
          },
  
          hook_texEnvfv: function(target, pname, params) {
            if (target != GL_TEXTURE_ENV) return;
  
            var env = getCurTexUnit().env;
            switch (pname) {
              case GL_TEXTURE_ENV_COLOR: {
                for (var i = 0; i < 4; i++) {
                  var param = HEAPF32[(((params)+(i*4))>>2)];
                  if (env.envColor[i] != param) {
                    env.invalidateKey(); // We changed FFP emulation renderer state.
                    env.envColor[i] = param;
                  }
                }
                break
              }
              default:
                err('WARNING: Unhandled `pname` in call to `glTexEnvfv`.');
            }
          },
  
          hook_getTexEnviv: function(target, pname, param) {
            if (target != GL_TEXTURE_ENV)
              return;
  
            var env = getCurTexUnit().env;
            switch (pname) {
              case GL_TEXTURE_ENV_MODE:
                HEAP32[((param)>>2)] = env.mode;
                return;
  
              case GL_TEXTURE_ENV_COLOR:
                HEAP32[((param)>>2)] = Math.max(Math.min(env.envColor[0]*255, 255, -255));
                HEAP32[(((param)+(1))>>2)] = Math.max(Math.min(env.envColor[1]*255, 255, -255));
                HEAP32[(((param)+(2))>>2)] = Math.max(Math.min(env.envColor[2]*255, 255, -255));
                HEAP32[(((param)+(3))>>2)] = Math.max(Math.min(env.envColor[3]*255, 255, -255));
                return;
  
              case GL_COMBINE_RGB:
                HEAP32[((param)>>2)] = env.colorCombiner;
                return;
  
              case GL_COMBINE_ALPHA:
                HEAP32[((param)>>2)] = env.alphaCombiner;
                return;
  
              case GL_SRC0_RGB:
                HEAP32[((param)>>2)] = env.colorSrc[0];
                return;
  
              case GL_SRC1_RGB:
                HEAP32[((param)>>2)] = env.colorSrc[1];
                return;
  
              case GL_SRC2_RGB:
                HEAP32[((param)>>2)] = env.colorSrc[2];
                return;
  
              case GL_SRC0_ALPHA:
                HEAP32[((param)>>2)] = env.alphaSrc[0];
                return;
  
              case GL_SRC1_ALPHA:
                HEAP32[((param)>>2)] = env.alphaSrc[1];
                return;
  
              case GL_SRC2_ALPHA:
                HEAP32[((param)>>2)] = env.alphaSrc[2];
                return;
  
              case GL_OPERAND0_RGB:
                HEAP32[((param)>>2)] = env.colorOp[0];
                return;
  
              case GL_OPERAND1_RGB:
                HEAP32[((param)>>2)] = env.colorOp[1];
                return;
  
              case GL_OPERAND2_RGB:
                HEAP32[((param)>>2)] = env.colorOp[2];
                return;
  
              case GL_OPERAND0_ALPHA:
                HEAP32[((param)>>2)] = env.alphaOp[0];
                return;
  
              case GL_OPERAND1_ALPHA:
                HEAP32[((param)>>2)] = env.alphaOp[1];
                return;
  
              case GL_OPERAND2_ALPHA:
                HEAP32[((param)>>2)] = env.alphaOp[2];
                return;
  
              case GL_RGB_SCALE:
                HEAP32[((param)>>2)] = env.colorScale;
                return;
  
              case GL_ALPHA_SCALE:
                HEAP32[((param)>>2)] = env.alphaScale;
                return;
  
              default:
                err('WARNING: Unhandled `pname` in call to `glGetTexEnvi`.');
            }
          },
  
          hook_getTexEnvfv: function(target, pname, param) {
            if (target != GL_TEXTURE_ENV)
              return;
  
            var env = getCurTexUnit().env;
            switch (pname) {
              case GL_TEXTURE_ENV_COLOR:
                HEAPF32[((param)>>2)] = env.envColor[0];
                HEAPF32[(((param)+(4))>>2)] = env.envColor[1];
                HEAPF32[(((param)+(8))>>2)] = env.envColor[2];
                HEAPF32[(((param)+(12))>>2)] = env.envColor[3];
                return;
            }
          }
        };
      },vertexData:null,vertexDataU8:null,tempData:null,indexData:null,vertexCounter:0,mode:-1,rendererCache:null,rendererComponents:[],rendererComponentPointer:0,lastRenderer:null,lastArrayBuffer:null,lastProgram:null,lastStride:-1,matrix:[],matrixStack:[],currentMatrix:0,tempMatrix:null,matricesModified:false,useTextureMatrix:false,VERTEX:0,NORMAL:1,COLOR:2,TEXTURE0:3,NUM_ATTRIBUTES:-1,MAX_TEXTURES:-1,totalEnabledClientAttributes:0,enabledClientAttributes:[0,0],clientAttributes:[],liveClientAttributes:[],currentRenderer:null,modifiedClientAttributes:false,clientActiveTexture:0,clientColor:null,usedTexUnitList:[],fixedFunctionProgram:null,setClientAttribute:function setClientAttribute(name, size, type, stride, pointer) {
        var attrib = GLImmediate.clientAttributes[name];
        if (!attrib) {
          for (var i = 0; i <= name; i++) { // keep flat
            if (!GLImmediate.clientAttributes[i]) {
              GLImmediate.clientAttributes[i] = {
                name: name,
                size: size,
                type: type,
                stride: stride,
                pointer: pointer,
                offset: 0
              };
            }
          }
        } else {
          attrib.name = name;
          attrib.size = size;
          attrib.type = type;
          attrib.stride = stride;
          attrib.pointer = pointer;
          attrib.offset = 0;
        }
        GLImmediate.modifiedClientAttributes = true;
      },addRendererComponent:function addRendererComponent(name, size, type) {
        if (!GLImmediate.rendererComponents[name]) {
          GLImmediate.rendererComponents[name] = 1;
          if (GLImmediate.enabledClientAttributes[name]) {
            console.log("Warning: glTexCoord used after EnableClientState for TEXTURE_COORD_ARRAY for TEXTURE0. Disabling TEXTURE_COORD_ARRAY...");
          }
          GLImmediate.enabledClientAttributes[name] = true;
          GLImmediate.setClientAttribute(name, size, type, 0, GLImmediate.rendererComponentPointer);
          GLImmediate.rendererComponentPointer += size * GL.byteSizeByType[type - GL.byteSizeByTypeRoot];
          // We can enable the correct attribute stream index immediately here, since the same attribute in each shader
          // will be bound to this same index.
          GL.enableVertexAttribArray(name);
        } else {
          GLImmediate.rendererComponents[name]++;
        }
      },disableBeginEndClientAttributes:function disableBeginEndClientAttributes() {
        for (var i = 0; i < GLImmediate.NUM_ATTRIBUTES; i++) {
          if (GLImmediate.rendererComponents[i]) GLImmediate.enabledClientAttributes[i] = false;
        }
      },getRenderer:function getRenderer() {
        // If no FFP state has changed that would have forced to re-evaluate which FFP emulation shader to use,
        // we have the currently used renderer in cache, and can immediately return that.
        if (GLImmediate.currentRenderer) {
          return GLImmediate.currentRenderer;
        }
        // return a renderer object given the liveClientAttributes
        // we maintain a cache of renderers, optimized to not generate garbage
        var attributes = GLImmediate.liveClientAttributes;
        var cacheMap = GLImmediate.rendererCache;
        var keyView = cacheMap.getStaticKeyView().reset();
  
        // By attrib state:
        var enabledAttributesKey = 0;
        for (var i = 0; i < attributes.length; i++) {
          enabledAttributesKey |= 1 << attributes[i].name;
        }
  
        // By fog state:
        var fogParam = 0;
        if (GLEmulation.fogEnabled) {
          switch (GLEmulation.fogMode) {
            case 0x801: // GL_EXP2
              fogParam = 1;
              break;
            case 0x2601: // GL_LINEAR
              fogParam = 2;
              break;
            default: // default to GL_EXP
              fogParam = 3;
              break;
          }
        }
        enabledAttributesKey = (enabledAttributesKey << 2) | fogParam;
  
        // By clip plane mode
        for (var clipPlaneId = 0; clipPlaneId < GLEmulation.MAX_CLIP_PLANES; clipPlaneId++) {
          enabledAttributesKey = (enabledAttributesKey << 1) | GLEmulation.clipPlaneEnabled[clipPlaneId];
        }
  
        // By lighting mode and enabled lights
        enabledAttributesKey = (enabledAttributesKey << 1) | GLEmulation.lightingEnabled;
        for (var lightId = 0; lightId < GLEmulation.MAX_LIGHTS; lightId++) {
          enabledAttributesKey = (enabledAttributesKey << 1) | (GLEmulation.lightingEnabled ? GLEmulation.lightEnabled[lightId] : 0);
        }
  
        // By drawing mode:
        enabledAttributesKey = (enabledAttributesKey << 1) | (GLImmediate.mode == GLctx.POINTS ? 1 : 0);
  
        keyView.next(enabledAttributesKey);
  
          GLImmediate.TexEnvJIT.traverseState(keyView);
  
        // If we don't already have it, create it.
        var renderer = keyView.get();
        if (!renderer) {
          renderer = GLImmediate.createRenderer();
          GLImmediate.currentRenderer = renderer;
          keyView.set(renderer);
          return renderer;
        }
        GLImmediate.currentRenderer = renderer; // Cache the currently used renderer, so later lookups without state changes can get this fast.
        return renderer;
      },createRenderer:function createRenderer(renderer) {
        var useCurrProgram = !!GL.currProgram;
        var hasTextures = false;
        for (var i = 0; i < GLImmediate.MAX_TEXTURES; i++) {
          var texAttribName = GLImmediate.TEXTURE0 + i;
          if (!GLImmediate.enabledClientAttributes[texAttribName])
            continue;
  
          if (!useCurrProgram) {
            if (GLImmediate.TexEnvJIT.getTexUnitType(i) == 0) {
               warnOnce("GL_TEXTURE" + i + " coords are supplied, but that texture unit is disabled in the fixed-function pipeline.");
            }
          }
  
          hasTextures = true;
        }
  
        var ret = {
          init: function init() {
            // For fixed-function shader generation.
            var uTexUnitPrefix = 'u_texUnit';
            var aTexCoordPrefix = 'a_texCoord';
            var vTexCoordPrefix = 'v_texCoord';
            var vPrimColor = 'v_color';
            var uTexMatrixPrefix = GLImmediate.useTextureMatrix ? 'u_textureMatrix' : null;
  
            if (useCurrProgram) {
              if (GL.shaderInfos[GL.programShaders[GL.currProgram][0]].type == GLctx.VERTEX_SHADER) {
                this.vertexShader = GL.shaders[GL.programShaders[GL.currProgram][0]];
                this.fragmentShader = GL.shaders[GL.programShaders[GL.currProgram][1]];
              } else {
                this.vertexShader = GL.shaders[GL.programShaders[GL.currProgram][1]];
                this.fragmentShader = GL.shaders[GL.programShaders[GL.currProgram][0]];
              }
              this.program = GL.programs[GL.currProgram];
              this.usedTexUnitList = [];
            } else {
              // IMPORTANT NOTE: If you parameterize the shader source based on any runtime values
              // in order to create the least expensive shader possible based on the features being
              // used, you should also update the code in the beginning of getRenderer to make sure
              // that you cache the renderer based on the said parameters.
              if (GLEmulation.fogEnabled) {
                switch (GLEmulation.fogMode) {
                  case 0x801: // GL_EXP2
                    // fog = exp(-(gl_Fog.density * gl_FogFragCoord)^2)
                    var fogFormula = '  float fog = exp(-u_fogDensity * u_fogDensity * ecDistance * ecDistance); \n';
                    break;
                  case 0x2601: // GL_LINEAR
                    // fog = (gl_Fog.end - gl_FogFragCoord) * gl_fog.scale
                    var fogFormula = '  float fog = (u_fogEnd - ecDistance) * u_fogScale; \n';
                    break;
                  default: // default to GL_EXP
                    // fog = exp(-gl_Fog.density * gl_FogFragCoord)
                    var fogFormula = '  float fog = exp(-u_fogDensity * ecDistance); \n';
                    break;
                }
              }
  
              GLImmediate.TexEnvJIT.setGLSLVars(uTexUnitPrefix, vTexCoordPrefix, vPrimColor, uTexMatrixPrefix);
              var fsTexEnvPass = GLImmediate.TexEnvJIT.genAllPassLines('gl_FragColor', 2);
  
              var texUnitAttribList = '';
              var texUnitVaryingList = '';
              var texUnitUniformList = '';
              var vsTexCoordInits = '';
              this.usedTexUnitList = GLImmediate.TexEnvJIT.getUsedTexUnitList();
              for (var i = 0; i < this.usedTexUnitList.length; i++) {
                var texUnit = this.usedTexUnitList[i];
                texUnitAttribList += 'attribute vec4 ' + aTexCoordPrefix + texUnit + ';\n';
                texUnitVaryingList += 'varying vec4 ' + vTexCoordPrefix + texUnit + ';\n';
                texUnitUniformList += 'uniform sampler2D ' + uTexUnitPrefix + texUnit + ';\n';
                vsTexCoordInits += '  ' + vTexCoordPrefix + texUnit + ' = ' + aTexCoordPrefix + texUnit + ';\n';
  
                if (GLImmediate.useTextureMatrix) {
                  texUnitUniformList += 'uniform mat4 ' + uTexMatrixPrefix + texUnit + ';\n';
                }
              }
  
              var vsFogVaryingInit = null;
              if (GLEmulation.fogEnabled) {
                vsFogVaryingInit = '  v_fogFragCoord = abs(ecPosition.z);\n';
              }
  
              var vsPointSizeDefs = null;
              var vsPointSizeInit = null;
              if (GLImmediate.mode == GLctx.POINTS) {
                vsPointSizeDefs = 'uniform float u_pointSize;\n';
                vsPointSizeInit = '  gl_PointSize = u_pointSize;\n';
              }
  
              var vsClipPlaneDefs = '';
              var vsClipPlaneInit = '';
              var fsClipPlaneDefs = '';
              var fsClipPlanePass = '';
              for (var clipPlaneId = 0; clipPlaneId < GLEmulation.MAX_CLIP_PLANES; clipPlaneId++) {
                if (GLEmulation.clipPlaneEnabled[clipPlaneId]) {
                  vsClipPlaneDefs += 'uniform vec4 u_clipPlaneEquation' + clipPlaneId + ';';
                  vsClipPlaneDefs += 'varying float v_clipDistance' + clipPlaneId + ';';
                  vsClipPlaneInit += '  v_clipDistance' + clipPlaneId + ' = dot(ecPosition, u_clipPlaneEquation' + clipPlaneId + ');';
                  fsClipPlaneDefs += 'varying float v_clipDistance' + clipPlaneId + ';';
                  fsClipPlanePass += '  if(v_clipDistance' + clipPlaneId + ' < 0.0) discard;';
                }
              }
  
              var vsLightingDefs = '';
              var vsLightingPass = '';
              if (GLEmulation.lightingEnabled) {
                vsLightingDefs += 'attribute vec3 a_normal;';
                vsLightingDefs += 'uniform mat3 u_normalMatrix;';
                vsLightingDefs += 'uniform vec4 u_lightModelAmbient;';
                vsLightingDefs += 'uniform vec4 u_materialAmbient;';
                vsLightingDefs += 'uniform vec4 u_materialDiffuse;';
                vsLightingDefs += 'uniform vec4 u_materialSpecular;';
                vsLightingDefs += 'uniform float u_materialShininess;';
                vsLightingDefs += 'uniform vec4 u_materialEmission;';
  
                vsLightingPass += '  vec3 ecNormal = normalize(u_normalMatrix * a_normal);';
                vsLightingPass += '  v_color.w = u_materialDiffuse.w;';
                vsLightingPass += '  v_color.xyz = u_materialEmission.xyz;';
                vsLightingPass += '  v_color.xyz += u_lightModelAmbient.xyz * u_materialAmbient.xyz;';
  
                for (var lightId = 0; lightId < GLEmulation.MAX_LIGHTS; lightId++) {
                  if (GLEmulation.lightEnabled[lightId]) {
                    vsLightingDefs += 'uniform vec4 u_lightAmbient' + lightId + ';';
                    vsLightingDefs += 'uniform vec4 u_lightDiffuse' + lightId + ';';
                    vsLightingDefs += 'uniform vec4 u_lightSpecular' + lightId + ';';
                    vsLightingDefs += 'uniform vec4 u_lightPosition' + lightId + ';';
  
                    vsLightingPass += '  {';
                    vsLightingPass += '    vec3 lightDirection = normalize(u_lightPosition' + lightId + ').xyz;';
                    vsLightingPass += '    vec3 halfVector = normalize(lightDirection + vec3(0,0,1));';
                    vsLightingPass += '    vec3 ambient = u_lightAmbient' + lightId + '.xyz * u_materialAmbient.xyz;';
                    vsLightingPass += '    float diffuseI = max(dot(ecNormal, lightDirection), 0.0);';
                    vsLightingPass += '    float specularI = max(dot(ecNormal, halfVector), 0.0);';
                    vsLightingPass += '    vec3 diffuse = diffuseI * u_lightDiffuse' + lightId + '.xyz * u_materialDiffuse.xyz;';
                    vsLightingPass += '    specularI = (diffuseI > 0.0 && specularI > 0.0) ? exp(u_materialShininess * log(specularI)) : 0.0;';
                    vsLightingPass += '    vec3 specular = specularI * u_lightSpecular' + lightId + '.xyz * u_materialSpecular.xyz;';
                    vsLightingPass += '    v_color.xyz += ambient + diffuse + specular;';
                    vsLightingPass += '  }';
                  }
                }
                vsLightingPass += '  v_color = clamp(v_color, 0.0, 1.0);';
              }
  
              var vsSource = [
                'attribute vec4 a_position;',
                'attribute vec4 a_color;',
                'varying vec4 v_color;',
                texUnitAttribList,
                texUnitVaryingList,
                (GLEmulation.fogEnabled ? 'varying float v_fogFragCoord;' : null),
                'uniform mat4 u_modelView;',
                'uniform mat4 u_projection;',
                vsPointSizeDefs,
                vsClipPlaneDefs,
                vsLightingDefs,
                'void main()',
                '{',
                '  vec4 ecPosition = u_modelView * a_position;', // eye-coordinate position
                '  gl_Position = u_projection * ecPosition;',
                '  v_color = a_color;',
                vsTexCoordInits,
                vsFogVaryingInit,
                vsPointSizeInit,
                vsClipPlaneInit,
                vsLightingPass,
                '}',
                ''
              ].join('\n').replace(/\n\n+/g, '\n');
  
              this.vertexShader = GLctx.createShader(GLctx.VERTEX_SHADER);
              GLctx.shaderSource(this.vertexShader, vsSource);
              GLctx.compileShader(this.vertexShader);
  
              var fogHeaderIfNeeded = null;
              if (GLEmulation.fogEnabled) {
                fogHeaderIfNeeded = [
                  '',
                  'varying float v_fogFragCoord; ',
                  'uniform vec4 u_fogColor;      ',
                  'uniform float u_fogEnd;       ',
                  'uniform float u_fogScale;     ',
                  'uniform float u_fogDensity;   ',
                  'float ffog(in float ecDistance) { ',
                  fogFormula,
                  '  fog = clamp(fog, 0.0, 1.0); ',
                  '  return fog;                 ',
                  '}',
                  '',
                ].join("\n");
              }
  
              var fogPass = null;
              if (GLEmulation.fogEnabled) {
                fogPass = 'gl_FragColor = vec4(mix(u_fogColor.rgb, gl_FragColor.rgb, ffog(v_fogFragCoord)), gl_FragColor.a);\n';
              }
  
              var fsSource = [
                'precision mediump float;',
                texUnitVaryingList,
                texUnitUniformList,
                'varying vec4 v_color;',
                fogHeaderIfNeeded,
                fsClipPlaneDefs,
                'void main()',
                '{',
                fsClipPlanePass,
                fsTexEnvPass,
                fogPass,
                '}',
                ''
              ].join("\n").replace(/\n\n+/g, '\n');
  
              this.fragmentShader = GLctx.createShader(GLctx.FRAGMENT_SHADER);
              GLctx.shaderSource(this.fragmentShader, fsSource);
              GLctx.compileShader(this.fragmentShader);
  
              this.program = GLctx.createProgram();
              GLctx.attachShader(this.program, this.vertexShader);
              GLctx.attachShader(this.program, this.fragmentShader);
  
              // As optimization, bind all attributes to prespecified locations, so that the FFP emulation
              // code can submit attributes to any generated FFP shader without having to examine each shader in turn.
              // These prespecified locations are only assumed if GL_FFP_ONLY is specified, since user could also create their
              // own shaders that didn't have attributes in the same locations.
              GLctx.bindAttribLocation(this.program, GLImmediate.VERTEX, 'a_position');
              GLctx.bindAttribLocation(this.program, GLImmediate.COLOR, 'a_color');
              GLctx.bindAttribLocation(this.program, GLImmediate.NORMAL, 'a_normal');
              var maxVertexAttribs = GLctx.getParameter(GLctx.MAX_VERTEX_ATTRIBS);
              for (var i = 0; i < GLImmediate.MAX_TEXTURES && GLImmediate.TEXTURE0 + i < maxVertexAttribs; i++) {
                GLctx.bindAttribLocation(this.program, GLImmediate.TEXTURE0 + i, 'a_texCoord'+i);
                GLctx.bindAttribLocation(this.program, GLImmediate.TEXTURE0 + i, aTexCoordPrefix+i);
              }
              GLctx.linkProgram(this.program);
            }
  
            // Stores an array that remembers which matrix uniforms are up-to-date in this FFP renderer, so they don't need to be resubmitted
            // each time we render with this program.
            this.textureMatrixVersion = [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ];
  
            this.positionLocation = GLctx.getAttribLocation(this.program, 'a_position');
  
            this.texCoordLocations = [];
  
            for (var i = 0; i < GLImmediate.MAX_TEXTURES; i++) {
              if (!GLImmediate.enabledClientAttributes[GLImmediate.TEXTURE0 + i]) {
                this.texCoordLocations[i] = -1;
                continue;
              }
  
              if (useCurrProgram) {
                this.texCoordLocations[i] = GLctx.getAttribLocation(this.program, 'a_texCoord' + i);
              } else {
                this.texCoordLocations[i] = GLctx.getAttribLocation(this.program, aTexCoordPrefix + i);
              }
            }
            this.colorLocation = GLctx.getAttribLocation(this.program, 'a_color');
            if (!useCurrProgram) {
              // Temporarily switch to the program so we can set our sampler uniforms early.
              var prevBoundProg = GLctx.getParameter(GLctx.CURRENT_PROGRAM);
              GLctx.useProgram(this.program);
              {
                for (var i = 0; i < this.usedTexUnitList.length; i++) {
                  var texUnitID = this.usedTexUnitList[i];
                  var texSamplerLoc = GLctx.getUniformLocation(this.program, uTexUnitPrefix + texUnitID);
                  GLctx.uniform1i(texSamplerLoc, texUnitID);
                }
              }
              // The default color attribute value is not the same as the default for all other attribute streams (0,0,0,1) but (1,1,1,1),
              // so explicitly set it right at start.
              GLctx.vertexAttrib4fv(this.colorLocation, [1,1,1,1]);
              GLctx.useProgram(prevBoundProg);
            }
  
            this.textureMatrixLocations = [];
            for (var i = 0; i < GLImmediate.MAX_TEXTURES; i++) {
              this.textureMatrixLocations[i] = GLctx.getUniformLocation(this.program, 'u_textureMatrix' + i);
            }
            this.normalLocation = GLctx.getAttribLocation(this.program, 'a_normal');
  
            this.modelViewLocation = GLctx.getUniformLocation(this.program, 'u_modelView');
            this.projectionLocation = GLctx.getUniformLocation(this.program, 'u_projection');
            this.normalMatrixLocation = GLctx.getUniformLocation(this.program, 'u_normalMatrix');
  
            this.hasTextures = hasTextures;
            this.hasNormal = GLImmediate.enabledClientAttributes[GLImmediate.NORMAL] &&
                             GLImmediate.clientAttributes[GLImmediate.NORMAL].size > 0 &&
                             this.normalLocation >= 0;
            this.hasColor = (this.colorLocation === 0) || this.colorLocation > 0;
  
            this.floatType = GLctx.FLOAT; // minor optimization
  
            this.fogColorLocation = GLctx.getUniformLocation(this.program, 'u_fogColor');
            this.fogEndLocation = GLctx.getUniformLocation(this.program, 'u_fogEnd');
            this.fogScaleLocation = GLctx.getUniformLocation(this.program, 'u_fogScale');
            this.fogDensityLocation = GLctx.getUniformLocation(this.program, 'u_fogDensity');
            this.hasFog = !!(this.fogColorLocation || this.fogEndLocation ||
                             this.fogScaleLocation || this.fogDensityLocation);
  
            this.pointSizeLocation = GLctx.getUniformLocation(this.program, 'u_pointSize');
  
            this.hasClipPlane = false;
            this.clipPlaneEquationLocation = [];
            for (var clipPlaneId = 0; clipPlaneId < GLEmulation.MAX_CLIP_PLANES; clipPlaneId++) {
              this.clipPlaneEquationLocation[clipPlaneId] = GLctx.getUniformLocation(this.program, 'u_clipPlaneEquation' + clipPlaneId);
              this.hasClipPlane = (this.hasClipPlane || this.clipPlaneEquationLocation[clipPlaneId]);
            }
  
            this.hasLighting = GLEmulation.lightingEnabled;
            this.lightModelAmbientLocation = GLctx.getUniformLocation(this.program, 'u_lightModelAmbient');
            this.materialAmbientLocation = GLctx.getUniformLocation(this.program, 'u_materialAmbient');
            this.materialDiffuseLocation = GLctx.getUniformLocation(this.program, 'u_materialDiffuse');
            this.materialSpecularLocation = GLctx.getUniformLocation(this.program, 'u_materialSpecular');
            this.materialShininessLocation = GLctx.getUniformLocation(this.program, 'u_materialShininess');
            this.materialEmissionLocation = GLctx.getUniformLocation(this.program, 'u_materialEmission');
            this.lightAmbientLocation = []
            this.lightDiffuseLocation = []
            this.lightSpecularLocation = []
            this.lightPositionLocation = []
            for (var lightId = 0; lightId < GLEmulation.MAX_LIGHTS; lightId++) {
              this.lightAmbientLocation[lightId] = GLctx.getUniformLocation(this.program, 'u_lightAmbient' + lightId);
              this.lightDiffuseLocation[lightId] = GLctx.getUniformLocation(this.program, 'u_lightDiffuse' + lightId);
              this.lightSpecularLocation[lightId] = GLctx.getUniformLocation(this.program, 'u_lightSpecular' + lightId);
              this.lightPositionLocation[lightId] = GLctx.getUniformLocation(this.program, 'u_lightPosition' + lightId);
            }
  
          },
  
          prepare: function prepare() {
            // Calculate the array buffer
            var arrayBuffer;
            if (!GLctx.currentArrayBufferBinding) {
              var start = GLImmediate.firstVertex*GLImmediate.stride;
              var end = GLImmediate.lastVertex*GLImmediate.stride;
              assert(end <= GL.MAX_TEMP_BUFFER_SIZE, 'too much vertex data');
              arrayBuffer = GL.getTempVertexBuffer(end);
              // TODO: consider using the last buffer we bound, if it was larger. downside is larger buffer, but we might avoid rebinding and preparing
            } else {
              arrayBuffer = GLctx.currentArrayBufferBinding;
            }
  
            // If the array buffer is unchanged and the renderer as well, then we can avoid all the work here
            // XXX We use some heuristics here, and this may not work in all cases. Try disabling GL_UNSAFE_OPTS if you
            // have odd glitches
            var lastRenderer = GLImmediate.lastRenderer;
            var canSkip = this == lastRenderer &&
                          arrayBuffer == GLImmediate.lastArrayBuffer &&
                          (GL.currProgram || this.program) == GLImmediate.lastProgram &&
                          GLImmediate.stride == GLImmediate.lastStride &&
                          !GLImmediate.matricesModified;
            if (!canSkip && lastRenderer) lastRenderer.cleanup();
            if (!GLctx.currentArrayBufferBinding) {
              // Bind the array buffer and upload data after cleaning up the previous renderer
  
              if (arrayBuffer != GLImmediate.lastArrayBuffer) {
                GLctx.bindBuffer(GLctx.ARRAY_BUFFER, arrayBuffer);
                GLImmediate.lastArrayBuffer = arrayBuffer;
              }
  
              GLctx.bufferSubData(GLctx.ARRAY_BUFFER, start, GLImmediate.vertexData.subarray(start >> 2, end >> 2));
            }
            if (canSkip) return;
            GLImmediate.lastRenderer = this;
            GLImmediate.lastProgram = GL.currProgram || this.program;
            GLImmediate.lastStride == GLImmediate.stride;
            GLImmediate.matricesModified = false;
  
            if (!GL.currProgram) {
              if (GLImmediate.fixedFunctionProgram != this.program) {
                GLctx.useProgram(this.program);
                GLImmediate.fixedFunctionProgram = this.program;
              }
            }
  
            if (this.modelViewLocation && this.modelViewMatrixVersion != GLImmediate.matrixVersion[0/*m*/]) {
              this.modelViewMatrixVersion = GLImmediate.matrixVersion[0/*m*/];
              GLctx.uniformMatrix4fv(this.modelViewLocation, false, GLImmediate.matrix[0/*m*/]);
  
              // set normal matrix to the upper 3x3 of the inverse transposed current modelview matrix
              if (GLEmulation.lightEnabled) {
                var tmpMVinv = GLImmediate.matrixLib.mat4.create(GLImmediate.matrix[0]);
                GLImmediate.matrixLib.mat4.inverse(tmpMVinv);
                GLImmediate.matrixLib.mat4.transpose(tmpMVinv);
                GLctx.uniformMatrix3fv(this.normalMatrixLocation, false, GLImmediate.matrixLib.mat4.toMat3(tmpMVinv));
              }
            }
            if (this.projectionLocation && this.projectionMatrixVersion != GLImmediate.matrixVersion[1/*p*/]) {
              this.projectionMatrixVersion = GLImmediate.matrixVersion[1/*p*/];
              GLctx.uniformMatrix4fv(this.projectionLocation, false, GLImmediate.matrix[1/*p*/]);
            }
  
            var clientAttributes = GLImmediate.clientAttributes;
            var posAttr = clientAttributes[GLImmediate.VERTEX];
  
            if (!GLctx.currentArrayBufferBinding) {
              GLctx.vertexAttribPointer(GLImmediate.VERTEX, posAttr.size, posAttr.type, false, GLImmediate.stride, posAttr.offset);
              if (this.hasNormal) {
                var normalAttr = clientAttributes[GLImmediate.NORMAL];
                GLctx.vertexAttribPointer(GLImmediate.NORMAL, normalAttr.size, normalAttr.type, true, GLImmediate.stride, normalAttr.offset);
              }
            }
            if (this.hasTextures) {
              for (var i = 0; i < GLImmediate.MAX_TEXTURES; i++) {
                if (!GLctx.currentArrayBufferBinding) {
                  var attribLoc = GLImmediate.TEXTURE0+i;
                  var texAttr = clientAttributes[attribLoc];
                  if (texAttr.size) {
                    GLctx.vertexAttribPointer(attribLoc, texAttr.size, texAttr.type, false, GLImmediate.stride, texAttr.offset);
                  } else {
                    // These two might be dangerous, but let's try them.
                    GLctx.vertexAttrib4f(attribLoc, 0, 0, 0, 1);
                  }
                }
                var t = 2/*t*/+i;
                if (this.textureMatrixLocations[i] && this.textureMatrixVersion[t] != GLImmediate.matrixVersion[t]) { // XXX might we need this even without the condition we are currently in?
                  this.textureMatrixVersion[t] = GLImmediate.matrixVersion[t];
                  GLctx.uniformMatrix4fv(this.textureMatrixLocations[i], false, GLImmediate.matrix[t]);
                }
              }
            }
            if (GLImmediate.enabledClientAttributes[GLImmediate.COLOR]) {
              var colorAttr = clientAttributes[GLImmediate.COLOR];
              if (!GLctx.currentArrayBufferBinding) {
                GLctx.vertexAttribPointer(GLImmediate.COLOR, colorAttr.size, colorAttr.type, true, GLImmediate.stride, colorAttr.offset);
              }
            }
            if (this.hasFog) {
              if (this.fogColorLocation) GLctx.uniform4fv(this.fogColorLocation, GLEmulation.fogColor);
              if (this.fogEndLocation) GLctx.uniform1f(this.fogEndLocation, GLEmulation.fogEnd);
              if (this.fogScaleLocation) GLctx.uniform1f(this.fogScaleLocation, 1/(GLEmulation.fogEnd - GLEmulation.fogStart));
              if (this.fogDensityLocation) GLctx.uniform1f(this.fogDensityLocation, GLEmulation.fogDensity);
            }
  
            if (this.hasClipPlane) {
              for (var clipPlaneId = 0; clipPlaneId < GLEmulation.MAX_CLIP_PLANES; clipPlaneId++) {
                if (this.clipPlaneEquationLocation[clipPlaneId]) GLctx.uniform4fv(this.clipPlaneEquationLocation[clipPlaneId], GLEmulation.clipPlaneEquation[clipPlaneId]);
              }
            }
  
            if (this.hasLighting) {
              if (this.lightModelAmbientLocation) GLctx.uniform4fv(this.lightModelAmbientLocation, GLEmulation.lightModelAmbient);
              if (this.materialAmbientLocation) GLctx.uniform4fv(this.materialAmbientLocation, GLEmulation.materialAmbient);
              if (this.materialDiffuseLocation) GLctx.uniform4fv(this.materialDiffuseLocation, GLEmulation.materialDiffuse);
              if (this.materialSpecularLocation) GLctx.uniform4fv(this.materialSpecularLocation, GLEmulation.materialSpecular);
              if (this.materialShininessLocation) GLctx.uniform1f(this.materialShininessLocation, GLEmulation.materialShininess[0]);
              if (this.materialEmissionLocation) GLctx.uniform4fv(this.materialEmissionLocation, GLEmulation.materialEmission);
              for (var lightId = 0; lightId < GLEmulation.MAX_LIGHTS; lightId++) {
                if (this.lightAmbientLocation[lightId]) GLctx.uniform4fv(this.lightAmbientLocation[lightId], GLEmulation.lightAmbient[lightId]);
                if (this.lightDiffuseLocation[lightId]) GLctx.uniform4fv(this.lightDiffuseLocation[lightId], GLEmulation.lightDiffuse[lightId]);
                if (this.lightSpecularLocation[lightId]) GLctx.uniform4fv(this.lightSpecularLocation[lightId], GLEmulation.lightSpecular[lightId]);
                if (this.lightPositionLocation[lightId]) GLctx.uniform4fv(this.lightPositionLocation[lightId], GLEmulation.lightPosition[lightId]);
              }
            }
  
            if (GLImmediate.mode == GLctx.POINTS) {
              if (this.pointSizeLocation) {
                GLctx.uniform1f(this.pointSizeLocation, GLEmulation.pointSize);
              }
            }
          },
  
          cleanup: function cleanup() {
          }
        };
        ret.init();
        return ret;
      },setupFuncs:function() {
        // TexEnv stuff needs to be prepared early, so do it here.
        // init() is too late for -O2, since it freezes the GL functions
        // by that point.
        GLImmediate.MapTreeLib = GLImmediate.spawnMapTreeLib();
        GLImmediate.spawnMapTreeLib = null;
  
        GLImmediate.TexEnvJIT = GLImmediate.spawnTexEnvJIT();
        GLImmediate.spawnTexEnvJIT = null;
  
        GLImmediate.setupHooks();
      },setupHooks:function() {
        if (!GLEmulation.hasRunInit) {
          GLEmulation.init();
        }
  
        var glActiveTexture = _glActiveTexture;
        _glActiveTexture = _emscripten_glActiveTexture = function _glActiveTexture(texture) {
          GLImmediate.TexEnvJIT.hook_activeTexture(texture);
          glActiveTexture(texture);
        };
        
  
        var glEnable = _glEnable;
        _glEnable = _emscripten_glEnable = function _glEnable(cap) {
          GLImmediate.TexEnvJIT.hook_enable(cap);
          glEnable(cap);
        };
        
  
        var glDisable = _glDisable;
        _glDisable = _emscripten_glDisable = function _glDisable(cap) {
          GLImmediate.TexEnvJIT.hook_disable(cap);
          glDisable(cap);
        };
        
  
        var glTexEnvf = (typeof(_glTexEnvf) != 'undefined') ? _glTexEnvf : function(){};
        _glTexEnvf = _emscripten_glTexEnvf = function _glTexEnvf(target, pname, param) {
          GLImmediate.TexEnvJIT.hook_texEnvf(target, pname, param);
          // Don't call old func, since we are the implementor.
          //glTexEnvf(target, pname, param);
        };
        
  
        var glTexEnvi = (typeof(_glTexEnvi) != 'undefined') ? _glTexEnvi : function(){};
        _glTexEnvi = _emscripten_glTexEnvi = function _glTexEnvi(target, pname, param) {
          GLImmediate.TexEnvJIT.hook_texEnvi(target, pname, param);
          // Don't call old func, since we are the implementor.
          //glTexEnvi(target, pname, param);
        };
        
  
        var glTexEnvfv = (typeof(_glTexEnvfv) != 'undefined') ? _glTexEnvfv : function(){};
        _glTexEnvfv = _emscripten_glTexEnvfv = function _glTexEnvfv(target, pname, param) {
          GLImmediate.TexEnvJIT.hook_texEnvfv(target, pname, param);
          // Don't call old func, since we are the implementor.
          //glTexEnvfv(target, pname, param);
        };
        
  
        _glGetTexEnviv = function _glGetTexEnviv(target, pname, param) {
          GLImmediate.TexEnvJIT.hook_getTexEnviv(target, pname, param);
        };
        
  
        _glGetTexEnvfv = function _glGetTexEnvfv(target, pname, param) {
          GLImmediate.TexEnvJIT.hook_getTexEnvfv(target, pname, param);
        };
        
  
        var glGetIntegerv = _glGetIntegerv;
        _glGetIntegerv = _emscripten_glGetIntegerv = function _glGetIntegerv(pname, params) {
          switch (pname) {
            case 0x8B8D: { // GL_CURRENT_PROGRAM
              // Just query directly so we're working with WebGL objects.
              var cur = GLctx.getParameter(GLctx.CURRENT_PROGRAM);
              if (cur == GLImmediate.fixedFunctionProgram) {
                // Pretend we're not using a program.
                HEAP32[((params)>>2)] = 0;
                return;
              }
              break;
            }
          }
          glGetIntegerv(pname, params);
        };
        
      },initted:false,init:function() {
        err('WARNING: using emscripten GL immediate mode emulation. This is very limited in what it supports');
        GLImmediate.initted = true;
  
        if (!Module.useWebGL) return; // a 2D canvas may be currently used TODO: make sure we are actually called in that case
  
        // User can override the maximum number of texture units that we emulate. Using fewer texture units increases runtime performance
        // slightly, so it is advantageous to choose as small value as needed.
        GLImmediate.MAX_TEXTURES = Module['GL_MAX_TEXTURE_IMAGE_UNITS'] || GLctx.getParameter(GLctx.MAX_TEXTURE_IMAGE_UNITS);
  
        GLImmediate.TexEnvJIT.init(GLctx, GLImmediate.MAX_TEXTURES);
  
        GLImmediate.NUM_ATTRIBUTES = 3 /*pos+normal+color attributes*/ + GLImmediate.MAX_TEXTURES;
        GLImmediate.clientAttributes = [];
        GLEmulation.enabledClientAttribIndices = [];
        for (var i = 0; i < GLImmediate.NUM_ATTRIBUTES; i++) {
          GLImmediate.clientAttributes.push({});
          GLEmulation.enabledClientAttribIndices.push(false);
        }
  
        // Initialize matrix library
        // When user sets a matrix, increment a 'version number' on the new data, and when rendering, submit
        // the matrices to the shader program only if they have an old version of the data.
        GLImmediate.matrix = [];
        GLImmediate.matrixStack = [];
        GLImmediate.matrixVersion = [];
        for (var i = 0; i < 2 + GLImmediate.MAX_TEXTURES; i++) { // Modelview, Projection, plus one matrix for each texture coordinate.
          GLImmediate.matrixStack.push([]);
          GLImmediate.matrixVersion.push(0);
          GLImmediate.matrix.push(GLImmediate.matrixLib.mat4.create());
          GLImmediate.matrixLib.mat4.identity(GLImmediate.matrix[i]);
        }
  
        // Renderer cache
        GLImmediate.rendererCache = GLImmediate.MapTreeLib.create();
  
        // Buffers for data
        GLImmediate.tempData = new Float32Array(GL.MAX_TEMP_BUFFER_SIZE >> 2);
        GLImmediate.indexData = new Uint16Array(GL.MAX_TEMP_BUFFER_SIZE >> 1);
  
        GLImmediate.vertexDataU8 = new Uint8Array(GLImmediate.tempData.buffer);
  
        GL.generateTempBuffers(true, GL.currentContext);
  
        GLImmediate.clientColor = new Float32Array([1, 1, 1, 1]);
      },prepareClientAttributes:function prepareClientAttributes(count, beginEnd) {
        // If no client attributes were modified since we were last called, do nothing. Note that this
        // does not work for glBegin/End, where we generate renderer components dynamically and then
        // disable them ourselves, but it does help with glDrawElements/Arrays.
        if (!GLImmediate.modifiedClientAttributes) {
          GLImmediate.vertexCounter = (GLImmediate.stride * count) / 4; // XXX assuming float
          return;
        }
        GLImmediate.modifiedClientAttributes = false;
  
        // The role of prepareClientAttributes is to examine the set of client-side vertex attribute buffers
        // that user code has submitted, and to prepare them to be uploaded to a VBO in GPU memory
        // (since WebGL does not support client-side rendering, i.e. rendering from vertex data in CPU memory)
        // User can submit vertex data generally in three different configurations:
        // 1. Fully planar: all attributes are in their own separate tightly-packed arrays in CPU memory.
        // 2. Fully interleaved: all attributes share a single array where data is interleaved something like (pos,uv,normal), (pos,uv,normal), ...
        // 3. Complex hybrid: Multiple separate arrays that either are sparsely strided, and/or partially interleave vertex attributes.
  
        // For simplicity, we support the case (2) as the fast case. For (1) and (3), we do a memory copy of the
        // vertex data here to prepare a relayouted buffer that is of the structure in case (2). The reason
        // for this is that it allows the emulation code to get away with using just one VBO buffer for rendering,
        // and not have to maintain multiple ones. Therefore cases (1) and (3) will be very slow, and case (2) is fast.
  
        // Detect which case we are in by using a quick heuristic by examining the strides of the buffers. If all the buffers have identical
        // stride, we assume we have case (2), otherwise we have something more complex.
        var clientStartPointer = 0x7FFFFFFF;
        var bytes = 0; // Total number of bytes taken up by a single vertex.
        var minStride = 0x7FFFFFFF;
        var maxStride = 0;
        var attributes = GLImmediate.liveClientAttributes;
        attributes.length = 0;
        for (var i = 0; i < 3+GLImmediate.MAX_TEXTURES; i++) {
          if (GLImmediate.enabledClientAttributes[i]) {
            var attr = GLImmediate.clientAttributes[i];
            attributes.push(attr);
            clientStartPointer = Math.min(clientStartPointer, attr.pointer);
            attr.sizeBytes = attr.size * GL.byteSizeByType[attr.type - GL.byteSizeByTypeRoot];
            bytes += attr.sizeBytes;
            minStride = Math.min(minStride, attr.stride);
            maxStride = Math.max(maxStride, attr.stride);
          }
        }
  
        if ((minStride != maxStride || maxStride < bytes) && !beginEnd) {
          // We are in cases (1) or (3): slow path, shuffle the data around into a single interleaved vertex buffer.
          // The immediate-mode glBegin()/glEnd() vertex submission gets automatically generated in appropriate layout,
          // so never need to come down this path if that was used.
          if (!GLImmediate.restrideBuffer) GLImmediate.restrideBuffer = _malloc(GL.MAX_TEMP_BUFFER_SIZE);
          var start = GLImmediate.restrideBuffer;
          bytes = 0;
          // calculate restrided offsets and total size
          for (var i = 0; i < attributes.length; i++) {
            var attr = attributes[i];
            var size = attr.sizeBytes;
            if (size % 4 != 0) size += 4 - (size % 4); // align everything
            attr.offset = bytes;
            bytes += size;
          }
          // copy out the data (we need to know the stride for that, and define attr.pointer)
          for (var i = 0; i < attributes.length; i++) {
            var attr = attributes[i];
            var srcStride = Math.max(attr.sizeBytes, attr.stride);
            if ((srcStride & 3) == 0 && (attr.sizeBytes & 3) == 0) {
              var size4 = attr.sizeBytes>>2;
              var srcStride4 = Math.max(attr.sizeBytes, attr.stride)>>2;
              for (var j = 0; j < count; j++) {
                for (var k = 0; k < size4; k++) { // copy in chunks of 4 bytes, our alignment makes this possible
                  HEAP32[((start + attr.offset + bytes*j)>>2) + k] = HEAP32[(attr.pointer>>2) + j*srcStride4 + k];
                }
              }
            } else {
              for (var j = 0; j < count; j++) {
                for (var k = 0; k < attr.sizeBytes; k++) { // source data was not aligned to multiples of 4, must copy byte by byte.
                  HEAP8[start + attr.offset + bytes*j + k] = HEAP8[attr.pointer + j*srcStride + k];
                }
              }
            }
            attr.pointer = start + attr.offset;
          }
          GLImmediate.stride = bytes;
          GLImmediate.vertexPointer = start;
        } else {
          // case (2): fast path, all data is interleaved to a single vertex array so we can get away with a single VBO upload.
          if (GLctx.currentArrayBufferBinding) {
            GLImmediate.vertexPointer = 0;
          } else {
            GLImmediate.vertexPointer = clientStartPointer;
          }
          for (var i = 0; i < attributes.length; i++) {
            var attr = attributes[i];
            attr.offset = attr.pointer - GLImmediate.vertexPointer; // Compute what will be the offset of this attribute in the VBO after we upload.
          }
          GLImmediate.stride = Math.max(maxStride, bytes);
        }
        if (!beginEnd) {
          GLImmediate.vertexCounter = (GLImmediate.stride * count) / 4; // XXX assuming float
        }
      },flush:function flush(numProvidedIndexes, startIndex, ptr) {
        assert(numProvidedIndexes >= 0 || !numProvidedIndexes);
        startIndex = startIndex || 0;
        ptr = ptr || 0;
  
        var renderer = GLImmediate.getRenderer();
  
        // Generate index data in a format suitable for GLES 2.0/WebGL
        var numVertexes = 4 * GLImmediate.vertexCounter / GLImmediate.stride;
        if (!numVertexes) return;
        assert(numVertexes % 1 == 0, "`numVertexes` must be an integer.");
        var emulatedElementArrayBuffer = false;
        var numIndexes = 0;
        if (numProvidedIndexes) {
          numIndexes = numProvidedIndexes;
          if (!GLctx.currentArrayBufferBinding && GLImmediate.firstVertex > GLImmediate.lastVertex) {
            // Figure out the first and last vertex from the index data
            // If we are going to upload array buffer data, we need to find which range to
            // upload based on the indices. If they are in a buffer on the GPU, that is very
            // inconvenient! So if you do not have an array buffer, you should also not have
            // an element array buffer. But best is to use both buffers!
            assert(!GLctx.currentElementArrayBufferBinding);
            for (var i = 0; i < numProvidedIndexes; i++) {
              var currIndex = HEAPU16[(((ptr)+(i*2))>>1)];
              GLImmediate.firstVertex = Math.min(GLImmediate.firstVertex, currIndex);
              GLImmediate.lastVertex = Math.max(GLImmediate.lastVertex, currIndex+1);
            }
          }
          if (!GLctx.currentElementArrayBufferBinding) {
            // If no element array buffer is bound, then indices is a literal pointer to clientside data
            assert(numProvidedIndexes << 1 <= GL.MAX_TEMP_BUFFER_SIZE, 'too many immediate mode indexes (a)');
            var indexBuffer = GL.getTempIndexBuffer(numProvidedIndexes << 1);
            GLctx.bindBuffer(GLctx.ELEMENT_ARRAY_BUFFER, indexBuffer);
            GLctx.bufferSubData(GLctx.ELEMENT_ARRAY_BUFFER, 0, HEAPU16.subarray((ptr)>>1, (ptr + (numProvidedIndexes << 1))>>1));
            ptr = 0;
            emulatedElementArrayBuffer = true;
          }
        } else if (GLImmediate.mode > 6) { // above GL_TRIANGLE_FAN are the non-GL ES modes
          if (GLImmediate.mode != 7) throw 'unsupported immediate mode ' + GLImmediate.mode; // GL_QUADS
          // GLImmediate.firstVertex is the first vertex we want. Quad indexes are in the pattern
          // 0 1 2, 0 2 3, 4 5 6, 4 6 7, so we need to look at index firstVertex * 1.5 to see it.
          // Then since indexes are 2 bytes each, that means 3
          assert(GLImmediate.firstVertex % 4 == 0);
          ptr = GLImmediate.firstVertex*3;
          var numQuads = numVertexes / 4;
          numIndexes = numQuads * 6; // 0 1 2, 0 2 3 pattern
          assert(ptr + (numIndexes << 1) <= GL.MAX_TEMP_BUFFER_SIZE, 'too many immediate mode indexes (b)');
          GLctx.bindBuffer(GLctx.ELEMENT_ARRAY_BUFFER, GL.currentContext.tempQuadIndexBuffer);
          emulatedElementArrayBuffer = true;
          GLImmediate.mode = GLctx.TRIANGLES;
        }
  
        renderer.prepare();
  
        if (numIndexes) {
          GLctx.drawElements(GLImmediate.mode, numIndexes, GLctx.UNSIGNED_SHORT, ptr);
        } else {
          GLctx.drawArrays(GLImmediate.mode, startIndex, numVertexes);
        }
  
        if (emulatedElementArrayBuffer) {
          GLctx.bindBuffer(GLctx.ELEMENT_ARRAY_BUFFER, GL.buffers[GLctx.currentElementArrayBufferBinding] || null);
        }
  
      }};
  GLImmediate.matrixLib = (function() {
  
  /**
   * @fileoverview gl-matrix - High performance matrix and vector operations for WebGL
   * @author Brandon Jones
   * @version 1.2.4
   */
  
  // Modifed for emscripten: Global scoping etc.
  
  /*
   * Copyright (c) 2011 Brandon Jones
   *
   * This software is provided 'as-is', without any express or implied
   * warranty. In no event will the authors be held liable for any damages
   * arising from the use of this software.
   *
   * Permission is granted to anyone to use this software for any purpose,
   * including commercial applications, and to alter it and redistribute it
   * freely, subject to the following restrictions:
   *
   *    1. The origin of this software must not be misrepresented; you must not
   *    claim that you wrote the original software. If you use this software
   *    in a product, an acknowledgment in the product documentation would be
   *    appreciated but is not required.
   *
   *    2. Altered source versions must be plainly marked as such, and must not
   *    be misrepresented as being the original software.
   *
   *    3. This notice may not be removed or altered from any source
   *    distribution.
   */
  
  
  /**
   * @class 3 Dimensional Vector
   * @name vec3
   */
  var vec3 = {};
  
  /**
   * @class 3x3 Matrix
   * @name mat3
   */
  var mat3 = {};
  
  /**
   * @class 4x4 Matrix
   * @name mat4
   */
  var mat4 = {};
  
  /**
   * @class Quaternion
   * @name quat4
   */
  var quat4 = {};
  
  var MatrixArray = Float32Array;
  
  /*
   * vec3
   */
  
  /**
   * Creates a new instance of a vec3 using the default array type
   * Any javascript array-like objects containing at least 3 numeric elements can serve as a vec3
   *
   * @param {vec3} [vec] vec3 containing values to initialize with
   *
   * @returns {vec3} New vec3
   */
  vec3.create = function (vec) {
      var dest = new MatrixArray(3);
  
      if (vec) {
          dest[0] = vec[0];
          dest[1] = vec[1];
          dest[2] = vec[2];
      } else {
          dest[0] = dest[1] = dest[2] = 0;
      }
  
      return dest;
  };
  
  /**
   * Copies the values of one vec3 to another
   *
   * @param {vec3} vec vec3 containing values to copy
   * @param {vec3} dest vec3 receiving copied values
   *
   * @returns {vec3} dest
   */
  vec3.set = function (vec, dest) {
      dest[0] = vec[0];
      dest[1] = vec[1];
      dest[2] = vec[2];
  
      return dest;
  };
  
  /**
   * Performs a vector addition
   *
   * @param {vec3} vec First operand
   * @param {vec3} vec2 Second operand
   * @param {vec3} [dest] vec3 receiving operation result. If not specified result is written to vec
   *
   * @returns {vec3} dest if specified, vec otherwise
   */
  vec3.add = function (vec, vec2, dest) {
      if (!dest || vec === dest) {
          vec[0] += vec2[0];
          vec[1] += vec2[1];
          vec[2] += vec2[2];
          return vec;
      }
  
      dest[0] = vec[0] + vec2[0];
      dest[1] = vec[1] + vec2[1];
      dest[2] = vec[2] + vec2[2];
      return dest;
  };
  
  /**
   * Performs a vector subtraction
   *
   * @param {vec3} vec First operand
   * @param {vec3} vec2 Second operand
   * @param {vec3} [dest] vec3 receiving operation result. If not specified result is written to vec
   *
   * @returns {vec3} dest if specified, vec otherwise
   */
  vec3.subtract = function (vec, vec2, dest) {
      if (!dest || vec === dest) {
          vec[0] -= vec2[0];
          vec[1] -= vec2[1];
          vec[2] -= vec2[2];
          return vec;
      }
  
      dest[0] = vec[0] - vec2[0];
      dest[1] = vec[1] - vec2[1];
      dest[2] = vec[2] - vec2[2];
      return dest;
  };
  
  /**
   * Performs a vector multiplication
   *
   * @param {vec3} vec First operand
   * @param {vec3} vec2 Second operand
   * @param {vec3} [dest] vec3 receiving operation result. If not specified result is written to vec
   *
   * @returns {vec3} dest if specified, vec otherwise
   */
  vec3.multiply = function (vec, vec2, dest) {
      if (!dest || vec === dest) {
          vec[0] *= vec2[0];
          vec[1] *= vec2[1];
          vec[2] *= vec2[2];
          return vec;
      }
  
      dest[0] = vec[0] * vec2[0];
      dest[1] = vec[1] * vec2[1];
      dest[2] = vec[2] * vec2[2];
      return dest;
  };
  
  /**
   * Negates the components of a vec3
   *
   * @param {vec3} vec vec3 to negate
   * @param {vec3} [dest] vec3 receiving operation result. If not specified result is written to vec
   *
   * @returns {vec3} dest if specified, vec otherwise
   */
  vec3.negate = function (vec, dest) {
      if (!dest) { dest = vec; }
  
      dest[0] = -vec[0];
      dest[1] = -vec[1];
      dest[2] = -vec[2];
      return dest;
  };
  
  /**
   * Multiplies the components of a vec3 by a scalar value
   *
   * @param {vec3} vec vec3 to scale
   * @param {number} val Value to scale by
   * @param {vec3} [dest] vec3 receiving operation result. If not specified result is written to vec
   *
   * @returns {vec3} dest if specified, vec otherwise
   */
  vec3.scale = function (vec, val, dest) {
      if (!dest || vec === dest) {
          vec[0] *= val;
          vec[1] *= val;
          vec[2] *= val;
          return vec;
      }
  
      dest[0] = vec[0] * val;
      dest[1] = vec[1] * val;
      dest[2] = vec[2] * val;
      return dest;
  };
  
  /**
   * Generates a unit vector of the same direction as the provided vec3
   * If vector length is 0, returns [0, 0, 0]
   *
   * @param {vec3} vec vec3 to normalize
   * @param {vec3} [dest] vec3 receiving operation result. If not specified result is written to vec
   *
   * @returns {vec3} dest if specified, vec otherwise
   */
  vec3.normalize = function (vec, dest) {
      if (!dest) { dest = vec; }
  
      var x = vec[0], y = vec[1], z = vec[2],
          len = Math.sqrt(x * x + y * y + z * z);
  
      if (!len) {
          dest[0] = 0;
          dest[1] = 0;
          dest[2] = 0;
          return dest;
      } else if (len === 1) {
          dest[0] = x;
          dest[1] = y;
          dest[2] = z;
          return dest;
      }
  
      len = 1 / len;
      dest[0] = x * len;
      dest[1] = y * len;
      dest[2] = z * len;
      return dest;
  };
  
  /**
   * Generates the cross product of two vec3s
   *
   * @param {vec3} vec First operand
   * @param {vec3} vec2 Second operand
   * @param {vec3} [dest] vec3 receiving operation result. If not specified result is written to vec
   *
   * @returns {vec3} dest if specified, vec otherwise
   */
  vec3.cross = function (vec, vec2, dest) {
      if (!dest) { dest = vec; }
  
      var x = vec[0], y = vec[1], z = vec[2],
          x2 = vec2[0], y2 = vec2[1], z2 = vec2[2];
  
      dest[0] = y * z2 - z * y2;
      dest[1] = z * x2 - x * z2;
      dest[2] = x * y2 - y * x2;
      return dest;
  };
  
  /**
   * Caclulates the length of a vec3
   *
   * @param {vec3} vec vec3 to calculate length of
   *
   * @returns {number} Length of vec
   */
  vec3.length = function (vec) {
      var x = vec[0], y = vec[1], z = vec[2];
      return Math.sqrt(x * x + y * y + z * z);
  };
  
  /**
   * Caclulates the dot product of two vec3s
   *
   * @param {vec3} vec First operand
   * @param {vec3} vec2 Second operand
   *
   * @returns {number} Dot product of vec and vec2
   */
  vec3.dot = function (vec, vec2) {
      return vec[0] * vec2[0] + vec[1] * vec2[1] + vec[2] * vec2[2];
  };
  
  /**
   * Generates a unit vector pointing from one vector to another
   *
   * @param {vec3} vec Origin vec3
   * @param {vec3} vec2 vec3 to point to
   * @param {vec3} [dest] vec3 receiving operation result. If not specified result is written to vec
   *
   * @returns {vec3} dest if specified, vec otherwise
   */
  vec3.direction = function (vec, vec2, dest) {
      if (!dest) { dest = vec; }
  
      var x = vec[0] - vec2[0],
          y = vec[1] - vec2[1],
          z = vec[2] - vec2[2],
          len = Math.sqrt(x * x + y * y + z * z);
  
      if (!len) {
          dest[0] = 0;
          dest[1] = 0;
          dest[2] = 0;
          return dest;
      }
  
      len = 1 / len;
      dest[0] = x * len;
      dest[1] = y * len;
      dest[2] = z * len;
      return dest;
  };
  
  /**
   * Performs a linear interpolation between two vec3
   *
   * @param {vec3} vec First vector
   * @param {vec3} vec2 Second vector
   * @param {number} lerp Interpolation amount between the two inputs
   * @param {vec3} [dest] vec3 receiving operation result. If not specified result is written to vec
   *
   * @returns {vec3} dest if specified, vec otherwise
   */
  vec3.lerp = function (vec, vec2, lerp, dest) {
      if (!dest) { dest = vec; }
  
      dest[0] = vec[0] + lerp * (vec2[0] - vec[0]);
      dest[1] = vec[1] + lerp * (vec2[1] - vec[1]);
      dest[2] = vec[2] + lerp * (vec2[2] - vec[2]);
  
      return dest;
  };
  
  /**
   * Calculates the euclidian distance between two vec3
   *
   * Params:
   * @param {vec3} vec First vector
   * @param {vec3} vec2 Second vector
   *
   * @returns {number} Distance between vec and vec2
   */
  vec3.dist = function (vec, vec2) {
      var x = vec2[0] - vec[0],
          y = vec2[1] - vec[1],
          z = vec2[2] - vec[2];
  
      return Math.sqrt(x*x + y*y + z*z);
  };
  
  /**
   * Projects the specified vec3 from screen space into object space
   * Based on the <a href="http://webcvs.freedesktop.org/mesa/Mesa/src/glu/mesa/project.c?revision=1.4&view=markup">Mesa gluUnProject implementation</a>
   *
   * @param {vec3} vec Screen-space vector to project
   * @param {mat4} view View matrix
   * @param {mat4} proj Projection matrix
   * @param {vec4} viewport Viewport as given to gl.viewport [x, y, width, height]
   * @param {vec3} [dest] vec3 receiving unprojected result. If not specified result is written to vec
   *
   * @returns {vec3} dest if specified, vec otherwise
   */
  vec3.unproject = function (vec, view, proj, viewport, dest) {
      if (!dest) { dest = vec; }
  
      var m = mat4.create();
      var v = new MatrixArray(4);
  
      v[0] = (vec[0] - viewport[0]) * 2.0 / viewport[2] - 1.0;
      v[1] = (vec[1] - viewport[1]) * 2.0 / viewport[3] - 1.0;
      v[2] = 2.0 * vec[2] - 1.0;
      v[3] = 1.0;
  
      mat4.multiply(proj, view, m);
      if(!mat4.inverse(m)) { return null; }
  
      mat4.multiplyVec4(m, v);
      if(v[3] === 0.0) { return null; }
  
      dest[0] = v[0] / v[3];
      dest[1] = v[1] / v[3];
      dest[2] = v[2] / v[3];
  
      return dest;
  };
  
  /**
   * Returns a string representation of a vector
   *
   * @param {vec3} vec Vector to represent as a string
   *
   * @returns {string} String representation of vec
   */
  vec3.str = function (vec) {
      return '[' + vec[0] + ', ' + vec[1] + ', ' + vec[2] + ']';
  };
  
  /*
   * mat3
   */
  
  /**
   * Creates a new instance of a mat3 using the default array type
   * Any javascript array-like object containing at least 9 numeric elements can serve as a mat3
   *
   * @param {mat3} [mat] mat3 containing values to initialize with
   *
   * @returns {mat3} New mat3
   */
  mat3.create = function (mat) {
      var dest = new MatrixArray(9);
  
      if (mat) {
          dest[0] = mat[0];
          dest[1] = mat[1];
          dest[2] = mat[2];
          dest[3] = mat[3];
          dest[4] = mat[4];
          dest[5] = mat[5];
          dest[6] = mat[6];
          dest[7] = mat[7];
          dest[8] = mat[8];
      }
  
      return dest;
  };
  
  /**
   * Copies the values of one mat3 to another
   *
   * @param {mat3} mat mat3 containing values to copy
   * @param {mat3} dest mat3 receiving copied values
   *
   * @returns {mat3} dest
   */
  mat3.set = function (mat, dest) {
      dest[0] = mat[0];
      dest[1] = mat[1];
      dest[2] = mat[2];
      dest[3] = mat[3];
      dest[4] = mat[4];
      dest[5] = mat[5];
      dest[6] = mat[6];
      dest[7] = mat[7];
      dest[8] = mat[8];
      return dest;
  };
  
  /**
   * Sets a mat3 to an identity matrix
   *
   * @param {mat3} dest mat3 to set
   *
   * @returns dest if specified, otherwise a new mat3
   */
  mat3.identity = function (dest) {
      if (!dest) { dest = mat3.create(); }
      dest[0] = 1;
      dest[1] = 0;
      dest[2] = 0;
      dest[3] = 0;
      dest[4] = 1;
      dest[5] = 0;
      dest[6] = 0;
      dest[7] = 0;
      dest[8] = 1;
      return dest;
  };
  
  /**
   * Transposes a mat3 (flips the values over the diagonal)
   *
   * Params:
   * @param {mat3} mat mat3 to transpose
   * @param {mat3} [dest] mat3 receiving transposed values. If not specified result is written to mat
   */
  mat3.transpose = function (mat, dest) {
      // If we are transposing ourselves we can skip a few steps but have to cache some values
      if (!dest || mat === dest) {
          var a01 = mat[1], a02 = mat[2],
              a12 = mat[5];
  
          mat[1] = mat[3];
          mat[2] = mat[6];
          mat[3] = a01;
          mat[5] = mat[7];
          mat[6] = a02;
          mat[7] = a12;
          return mat;
      }
  
      dest[0] = mat[0];
      dest[1] = mat[3];
      dest[2] = mat[6];
      dest[3] = mat[1];
      dest[4] = mat[4];
      dest[5] = mat[7];
      dest[6] = mat[2];
      dest[7] = mat[5];
      dest[8] = mat[8];
      return dest;
  };
  
  /**
   * Copies the elements of a mat3 into the upper 3x3 elements of a mat4
   *
   * @param {mat3} mat mat3 containing values to copy
   * @param {mat4} [dest] mat4 receiving copied values
   *
   * @returns {mat4} dest if specified, a new mat4 otherwise
   */
  mat3.toMat4 = function (mat, dest) {
      if (!dest) { dest = mat4.create(); }
  
      dest[15] = 1;
      dest[14] = 0;
      dest[13] = 0;
      dest[12] = 0;
  
      dest[11] = 0;
      dest[10] = mat[8];
      dest[9] = mat[7];
      dest[8] = mat[6];
  
      dest[7] = 0;
      dest[6] = mat[5];
      dest[5] = mat[4];
      dest[4] = mat[3];
  
      dest[3] = 0;
      dest[2] = mat[2];
      dest[1] = mat[1];
      dest[0] = mat[0];
  
      return dest;
  };
  
  /**
   * Returns a string representation of a mat3
   *
   * @param {mat3} mat mat3 to represent as a string
   *
   * @param {string} String representation of mat
   */
  mat3.str = function (mat) {
      return '[' + mat[0] + ', ' + mat[1] + ', ' + mat[2] +
          ', ' + mat[3] + ', ' + mat[4] + ', ' + mat[5] +
          ', ' + mat[6] + ', ' + mat[7] + ', ' + mat[8] + ']';
  };
  
  /*
   * mat4
   */
  
  /**
   * Creates a new instance of a mat4 using the default array type
   * Any javascript array-like object containing at least 16 numeric elements can serve as a mat4
   *
   * @param {mat4} [mat] mat4 containing values to initialize with
   *
   * @returns {mat4} New mat4
   */
  mat4.create = function (mat) {
      var dest = new MatrixArray(16);
  
      if (mat) {
          dest[0] = mat[0];
          dest[1] = mat[1];
          dest[2] = mat[2];
          dest[3] = mat[3];
          dest[4] = mat[4];
          dest[5] = mat[5];
          dest[6] = mat[6];
          dest[7] = mat[7];
          dest[8] = mat[8];
          dest[9] = mat[9];
          dest[10] = mat[10];
          dest[11] = mat[11];
          dest[12] = mat[12];
          dest[13] = mat[13];
          dest[14] = mat[14];
          dest[15] = mat[15];
      }
  
      return dest;
  };
  
  /**
   * Copies the values of one mat4 to another
   *
   * @param {mat4} mat mat4 containing values to copy
   * @param {mat4} dest mat4 receiving copied values
   *
   * @returns {mat4} dest
   */
  mat4.set = function (mat, dest) {
      dest[0] = mat[0];
      dest[1] = mat[1];
      dest[2] = mat[2];
      dest[3] = mat[3];
      dest[4] = mat[4];
      dest[5] = mat[5];
      dest[6] = mat[6];
      dest[7] = mat[7];
      dest[8] = mat[8];
      dest[9] = mat[9];
      dest[10] = mat[10];
      dest[11] = mat[11];
      dest[12] = mat[12];
      dest[13] = mat[13];
      dest[14] = mat[14];
      dest[15] = mat[15];
      return dest;
  };
  
  /**
   * Sets a mat4 to an identity matrix
   *
   * @param {mat4} dest mat4 to set
   *
   * @returns {mat4} dest
   */
  mat4.identity = function (dest) {
      if (!dest) { dest = mat4.create(); }
      dest[0] = 1;
      dest[1] = 0;
      dest[2] = 0;
      dest[3] = 0;
      dest[4] = 0;
      dest[5] = 1;
      dest[6] = 0;
      dest[7] = 0;
      dest[8] = 0;
      dest[9] = 0;
      dest[10] = 1;
      dest[11] = 0;
      dest[12] = 0;
      dest[13] = 0;
      dest[14] = 0;
      dest[15] = 1;
      return dest;
  };
  
  /**
   * Transposes a mat4 (flips the values over the diagonal)
   *
   * @param {mat4} mat mat4 to transpose
   * @param {mat4} [dest] mat4 receiving transposed values. If not specified result is written to mat
   */
  mat4.transpose = function (mat, dest) {
      // If we are transposing ourselves we can skip a few steps but have to cache some values
      if (!dest || mat === dest) {
          var a01 = mat[1], a02 = mat[2], a03 = mat[3],
              a12 = mat[6], a13 = mat[7],
              a23 = mat[11];
  
          mat[1] = mat[4];
          mat[2] = mat[8];
          mat[3] = mat[12];
          mat[4] = a01;
          mat[6] = mat[9];
          mat[7] = mat[13];
          mat[8] = a02;
          mat[9] = a12;
          mat[11] = mat[14];
          mat[12] = a03;
          mat[13] = a13;
          mat[14] = a23;
          return mat;
      }
  
      dest[0] = mat[0];
      dest[1] = mat[4];
      dest[2] = mat[8];
      dest[3] = mat[12];
      dest[4] = mat[1];
      dest[5] = mat[5];
      dest[6] = mat[9];
      dest[7] = mat[13];
      dest[8] = mat[2];
      dest[9] = mat[6];
      dest[10] = mat[10];
      dest[11] = mat[14];
      dest[12] = mat[3];
      dest[13] = mat[7];
      dest[14] = mat[11];
      dest[15] = mat[15];
      return dest;
  };
  
  /**
   * Calculates the determinant of a mat4
   *
   * @param {mat4} mat mat4 to calculate determinant of
   *
   * @returns {number} determinant of mat
   */
  mat4.determinant = function (mat) {
      // Cache the matrix values (makes for huge speed increases!)
      var a00 = mat[0], a01 = mat[1], a02 = mat[2], a03 = mat[3],
          a10 = mat[4], a11 = mat[5], a12 = mat[6], a13 = mat[7],
          a20 = mat[8], a21 = mat[9], a22 = mat[10], a23 = mat[11],
          a30 = mat[12], a31 = mat[13], a32 = mat[14], a33 = mat[15];
  
      return (a30 * a21 * a12 * a03 - a20 * a31 * a12 * a03 - a30 * a11 * a22 * a03 + a10 * a31 * a22 * a03 +
              a20 * a11 * a32 * a03 - a10 * a21 * a32 * a03 - a30 * a21 * a02 * a13 + a20 * a31 * a02 * a13 +
              a30 * a01 * a22 * a13 - a00 * a31 * a22 * a13 - a20 * a01 * a32 * a13 + a00 * a21 * a32 * a13 +
              a30 * a11 * a02 * a23 - a10 * a31 * a02 * a23 - a30 * a01 * a12 * a23 + a00 * a31 * a12 * a23 +
              a10 * a01 * a32 * a23 - a00 * a11 * a32 * a23 - a20 * a11 * a02 * a33 + a10 * a21 * a02 * a33 +
              a20 * a01 * a12 * a33 - a00 * a21 * a12 * a33 - a10 * a01 * a22 * a33 + a00 * a11 * a22 * a33);
  };
  
  /**
   * Calculates the inverse matrix of a mat4
   *
   * @param {mat4} mat mat4 to calculate inverse of
   * @param {mat4} [dest] mat4 receiving inverse matrix. If not specified result is written to mat, null if matrix cannot be inverted
   */
  mat4.inverse = function (mat, dest) {
      if (!dest) { dest = mat; }
  
      // Cache the matrix values (makes for huge speed increases!)
      var a00 = mat[0], a01 = mat[1], a02 = mat[2], a03 = mat[3],
          a10 = mat[4], a11 = mat[5], a12 = mat[6], a13 = mat[7],
          a20 = mat[8], a21 = mat[9], a22 = mat[10], a23 = mat[11],
          a30 = mat[12], a31 = mat[13], a32 = mat[14], a33 = mat[15],
  
          b00 = a00 * a11 - a01 * a10,
          b01 = a00 * a12 - a02 * a10,
          b02 = a00 * a13 - a03 * a10,
          b03 = a01 * a12 - a02 * a11,
          b04 = a01 * a13 - a03 * a11,
          b05 = a02 * a13 - a03 * a12,
          b06 = a20 * a31 - a21 * a30,
          b07 = a20 * a32 - a22 * a30,
          b08 = a20 * a33 - a23 * a30,
          b09 = a21 * a32 - a22 * a31,
          b10 = a21 * a33 - a23 * a31,
          b11 = a22 * a33 - a23 * a32,
  
          d = (b00 * b11 - b01 * b10 + b02 * b09 + b03 * b08 - b04 * b07 + b05 * b06),
          invDet;
  
          // Calculate the determinant
          if (!d) { return null; }
          invDet = 1 / d;
  
      dest[0] = (a11 * b11 - a12 * b10 + a13 * b09) * invDet;
      dest[1] = (-a01 * b11 + a02 * b10 - a03 * b09) * invDet;
      dest[2] = (a31 * b05 - a32 * b04 + a33 * b03) * invDet;
      dest[3] = (-a21 * b05 + a22 * b04 - a23 * b03) * invDet;
      dest[4] = (-a10 * b11 + a12 * b08 - a13 * b07) * invDet;
      dest[5] = (a00 * b11 - a02 * b08 + a03 * b07) * invDet;
      dest[6] = (-a30 * b05 + a32 * b02 - a33 * b01) * invDet;
      dest[7] = (a20 * b05 - a22 * b02 + a23 * b01) * invDet;
      dest[8] = (a10 * b10 - a11 * b08 + a13 * b06) * invDet;
      dest[9] = (-a00 * b10 + a01 * b08 - a03 * b06) * invDet;
      dest[10] = (a30 * b04 - a31 * b02 + a33 * b00) * invDet;
      dest[11] = (-a20 * b04 + a21 * b02 - a23 * b00) * invDet;
      dest[12] = (-a10 * b09 + a11 * b07 - a12 * b06) * invDet;
      dest[13] = (a00 * b09 - a01 * b07 + a02 * b06) * invDet;
      dest[14] = (-a30 * b03 + a31 * b01 - a32 * b00) * invDet;
      dest[15] = (a20 * b03 - a21 * b01 + a22 * b00) * invDet;
  
      return dest;
  };
  
  /**
   * Copies the upper 3x3 elements of a mat4 into another mat4
   *
   * @param {mat4} mat mat4 containing values to copy
   * @param {mat4} [dest] mat4 receiving copied values
   *
   * @returns {mat4} dest is specified, a new mat4 otherwise
   */
  mat4.toRotationMat = function (mat, dest) {
      if (!dest) { dest = mat4.create(); }
  
      dest[0] = mat[0];
      dest[1] = mat[1];
      dest[2] = mat[2];
      dest[3] = mat[3];
      dest[4] = mat[4];
      dest[5] = mat[5];
      dest[6] = mat[6];
      dest[7] = mat[7];
      dest[8] = mat[8];
      dest[9] = mat[9];
      dest[10] = mat[10];
      dest[11] = mat[11];
      dest[12] = 0;
      dest[13] = 0;
      dest[14] = 0;
      dest[15] = 1;
  
      return dest;
  };
  
  /**
   * Copies the upper 3x3 elements of a mat4 into a mat3
   *
   * @param {mat4} mat mat4 containing values to copy
   * @param {mat3} [dest] mat3 receiving copied values
   *
   * @returns {mat3} dest is specified, a new mat3 otherwise
   */
  mat4.toMat3 = function (mat, dest) {
      if (!dest) { dest = mat3.create(); }
  
      dest[0] = mat[0];
      dest[1] = mat[1];
      dest[2] = mat[2];
      dest[3] = mat[4];
      dest[4] = mat[5];
      dest[5] = mat[6];
      dest[6] = mat[8];
      dest[7] = mat[9];
      dest[8] = mat[10];
  
      return dest;
  };
  
  /**
   * Calculates the inverse of the upper 3x3 elements of a mat4 and copies the result into a mat3
   * The resulting matrix is useful for calculating transformed normals
   *
   * Params:
   * @param {mat4} mat mat4 containing values to invert and copy
   * @param {mat3} [dest] mat3 receiving values
   *
   * @returns {mat3} dest is specified, a new mat3 otherwise, null if the matrix cannot be inverted
   */
  mat4.toInverseMat3 = function (mat, dest) {
      // Cache the matrix values (makes for huge speed increases!)
      var a00 = mat[0], a01 = mat[1], a02 = mat[2],
          a10 = mat[4], a11 = mat[5], a12 = mat[6],
          a20 = mat[8], a21 = mat[9], a22 = mat[10],
  
          b01 = a22 * a11 - a12 * a21,
          b11 = -a22 * a10 + a12 * a20,
          b21 = a21 * a10 - a11 * a20,
  
          d = a00 * b01 + a01 * b11 + a02 * b21,
          id;
  
      if (!d) { return null; }
      id = 1 / d;
  
      if (!dest) { dest = mat3.create(); }
  
      dest[0] = b01 * id;
      dest[1] = (-a22 * a01 + a02 * a21) * id;
      dest[2] = (a12 * a01 - a02 * a11) * id;
      dest[3] = b11 * id;
      dest[4] = (a22 * a00 - a02 * a20) * id;
      dest[5] = (-a12 * a00 + a02 * a10) * id;
      dest[6] = b21 * id;
      dest[7] = (-a21 * a00 + a01 * a20) * id;
      dest[8] = (a11 * a00 - a01 * a10) * id;
  
      return dest;
  };
  
  /**
   * Performs a matrix multiplication
   *
   * @param {mat4} mat First operand
   * @param {mat4} mat2 Second operand
   * @param {mat4} [dest] mat4 receiving operation result. If not specified result is written to mat
   */
  mat4.multiply = function (mat, mat2, dest) {
      if (!dest) { dest = mat; }
  
      // Cache the matrix values (makes for huge speed increases!)
      var a00 = mat[0], a01 = mat[1], a02 = mat[2], a03 = mat[3],
          a10 = mat[4], a11 = mat[5], a12 = mat[6], a13 = mat[7],
          a20 = mat[8], a21 = mat[9], a22 = mat[10], a23 = mat[11],
          a30 = mat[12], a31 = mat[13], a32 = mat[14], a33 = mat[15],
  
          b00 = mat2[0], b01 = mat2[1], b02 = mat2[2], b03 = mat2[3],
          b10 = mat2[4], b11 = mat2[5], b12 = mat2[6], b13 = mat2[7],
          b20 = mat2[8], b21 = mat2[9], b22 = mat2[10], b23 = mat2[11],
          b30 = mat2[12], b31 = mat2[13], b32 = mat2[14], b33 = mat2[15];
  
      dest[0] = b00 * a00 + b01 * a10 + b02 * a20 + b03 * a30;
      dest[1] = b00 * a01 + b01 * a11 + b02 * a21 + b03 * a31;
      dest[2] = b00 * a02 + b01 * a12 + b02 * a22 + b03 * a32;
      dest[3] = b00 * a03 + b01 * a13 + b02 * a23 + b03 * a33;
      dest[4] = b10 * a00 + b11 * a10 + b12 * a20 + b13 * a30;
      dest[5] = b10 * a01 + b11 * a11 + b12 * a21 + b13 * a31;
      dest[6] = b10 * a02 + b11 * a12 + b12 * a22 + b13 * a32;
      dest[7] = b10 * a03 + b11 * a13 + b12 * a23 + b13 * a33;
      dest[8] = b20 * a00 + b21 * a10 + b22 * a20 + b23 * a30;
      dest[9] = b20 * a01 + b21 * a11 + b22 * a21 + b23 * a31;
      dest[10] = b20 * a02 + b21 * a12 + b22 * a22 + b23 * a32;
      dest[11] = b20 * a03 + b21 * a13 + b22 * a23 + b23 * a33;
      dest[12] = b30 * a00 + b31 * a10 + b32 * a20 + b33 * a30;
      dest[13] = b30 * a01 + b31 * a11 + b32 * a21 + b33 * a31;
      dest[14] = b30 * a02 + b31 * a12 + b32 * a22 + b33 * a32;
      dest[15] = b30 * a03 + b31 * a13 + b32 * a23 + b33 * a33;
  
      return dest;
  };
  
  /**
   * Transforms a vec3 with the given matrix
   * 4th vector component is implicitly '1'
   *
   * @param {mat4} mat mat4 to transform the vector with
   * @param {vec3} vec vec3 to transform
   * @param {vec3} [dest] vec3 receiving operation result. If not specified result is written to vec
   *
   * @returns {vec3} dest if specified, vec otherwise
   */
  mat4.multiplyVec3 = function (mat, vec, dest) {
      if (!dest) { dest = vec; }
  
      var x = vec[0], y = vec[1], z = vec[2];
  
      dest[0] = mat[0] * x + mat[4] * y + mat[8] * z + mat[12];
      dest[1] = mat[1] * x + mat[5] * y + mat[9] * z + mat[13];
      dest[2] = mat[2] * x + mat[6] * y + mat[10] * z + mat[14];
  
      return dest;
  };
  
  /**
   * Transforms a vec4 with the given matrix
   *
   * @param {mat4} mat mat4 to transform the vector with
   * @param {vec4} vec vec4 to transform
   * @param {vec4} [dest] vec4 receiving operation result. If not specified result is written to vec
   *
   * @returns {vec4} dest if specified, vec otherwise
   */
  mat4.multiplyVec4 = function (mat, vec, dest) {
      if (!dest) { dest = vec; }
  
      var x = vec[0], y = vec[1], z = vec[2], w = vec[3];
  
      dest[0] = mat[0] * x + mat[4] * y + mat[8] * z + mat[12] * w;
      dest[1] = mat[1] * x + mat[5] * y + mat[9] * z + mat[13] * w;
      dest[2] = mat[2] * x + mat[6] * y + mat[10] * z + mat[14] * w;
      dest[3] = mat[3] * x + mat[7] * y + mat[11] * z + mat[15] * w;
  
      return dest;
  };
  
  /**
   * Translates a matrix by the given vector
   *
   * @param {mat4} mat mat4 to translate
   * @param {vec3} vec vec3 specifying the translation
   * @param {mat4} [dest] mat4 receiving operation result. If not specified result is written to mat
   */
  mat4.translate = function (mat, vec, dest) {
      var x = vec[0], y = vec[1], z = vec[2],
          a00, a01, a02, a03,
          a10, a11, a12, a13,
          a20, a21, a22, a23;
  
      if (!dest || mat === dest) {
          mat[12] = mat[0] * x + mat[4] * y + mat[8] * z + mat[12];
          mat[13] = mat[1] * x + mat[5] * y + mat[9] * z + mat[13];
          mat[14] = mat[2] * x + mat[6] * y + mat[10] * z + mat[14];
          mat[15] = mat[3] * x + mat[7] * y + mat[11] * z + mat[15];
          return mat;
      }
  
      a00 = mat[0]; a01 = mat[1]; a02 = mat[2]; a03 = mat[3];
      a10 = mat[4]; a11 = mat[5]; a12 = mat[6]; a13 = mat[7];
      a20 = mat[8]; a21 = mat[9]; a22 = mat[10]; a23 = mat[11];
  
      dest[0] = a00; dest[1] = a01; dest[2] = a02; dest[3] = a03;
      dest[4] = a10; dest[5] = a11; dest[6] = a12; dest[7] = a13;
      dest[8] = a20; dest[9] = a21; dest[10] = a22; dest[11] = a23;
  
      dest[12] = a00 * x + a10 * y + a20 * z + mat[12];
      dest[13] = a01 * x + a11 * y + a21 * z + mat[13];
      dest[14] = a02 * x + a12 * y + a22 * z + mat[14];
      dest[15] = a03 * x + a13 * y + a23 * z + mat[15];
      return dest;
  };
  
  /**
   * Scales a matrix by the given vector
   *
   * @param {mat4} mat mat4 to scale
   * @param {vec3} vec vec3 specifying the scale for each axis
   * @param {mat4} [dest] mat4 receiving operation result. If not specified result is written to mat
   */
  mat4.scale = function (mat, vec, dest) {
      var x = vec[0], y = vec[1], z = vec[2];
  
      if (!dest || mat === dest) {
          mat[0] *= x;
          mat[1] *= x;
          mat[2] *= x;
          mat[3] *= x;
          mat[4] *= y;
          mat[5] *= y;
          mat[6] *= y;
          mat[7] *= y;
          mat[8] *= z;
          mat[9] *= z;
          mat[10] *= z;
          mat[11] *= z;
          return mat;
      }
  
      dest[0] = mat[0] * x;
      dest[1] = mat[1] * x;
      dest[2] = mat[2] * x;
      dest[3] = mat[3] * x;
      dest[4] = mat[4] * y;
      dest[5] = mat[5] * y;
      dest[6] = mat[6] * y;
      dest[7] = mat[7] * y;
      dest[8] = mat[8] * z;
      dest[9] = mat[9] * z;
      dest[10] = mat[10] * z;
      dest[11] = mat[11] * z;
      dest[12] = mat[12];
      dest[13] = mat[13];
      dest[14] = mat[14];
      dest[15] = mat[15];
      return dest;
  };
  
  /**
   * Rotates a matrix by the given angle around the specified axis
   * If rotating around a primary axis (X,Y,Z) one of the specialized rotation functions should be used instead for performance
   *
   * @param {mat4} mat mat4 to rotate
   * @param {number} angle Angle (in radians) to rotate
   * @param {vec3} axis vec3 representing the axis to rotate around
   * @param {mat4} [dest] mat4 receiving operation result. If not specified result is written to mat
   */
  mat4.rotate = function (mat, angle, axis, dest) {
      var x = axis[0], y = axis[1], z = axis[2],
          len = Math.sqrt(x * x + y * y + z * z),
          s, c, t,
          a00, a01, a02, a03,
          a10, a11, a12, a13,
          a20, a21, a22, a23,
          b00, b01, b02,
          b10, b11, b12,
          b20, b21, b22;
  
      if (!len) { return null; }
      if (len !== 1) {
          len = 1 / len;
          x *= len;
          y *= len;
          z *= len;
      }
  
      s = Math.sin(angle);
      c = Math.cos(angle);
      t = 1 - c;
  
      a00 = mat[0]; a01 = mat[1]; a02 = mat[2]; a03 = mat[3];
      a10 = mat[4]; a11 = mat[5]; a12 = mat[6]; a13 = mat[7];
      a20 = mat[8]; a21 = mat[9]; a22 = mat[10]; a23 = mat[11];
  
      // Construct the elements of the rotation matrix
      b00 = x * x * t + c; b01 = y * x * t + z * s; b02 = z * x * t - y * s;
      b10 = x * y * t - z * s; b11 = y * y * t + c; b12 = z * y * t + x * s;
      b20 = x * z * t + y * s; b21 = y * z * t - x * s; b22 = z * z * t + c;
  
      if (!dest) {
          dest = mat;
      } else if (mat !== dest) { // If the source and destination differ, copy the unchanged last row
          dest[12] = mat[12];
          dest[13] = mat[13];
          dest[14] = mat[14];
          dest[15] = mat[15];
      }
  
      // Perform rotation-specific matrix multiplication
      dest[0] = a00 * b00 + a10 * b01 + a20 * b02;
      dest[1] = a01 * b00 + a11 * b01 + a21 * b02;
      dest[2] = a02 * b00 + a12 * b01 + a22 * b02;
      dest[3] = a03 * b00 + a13 * b01 + a23 * b02;
  
      dest[4] = a00 * b10 + a10 * b11 + a20 * b12;
      dest[5] = a01 * b10 + a11 * b11 + a21 * b12;
      dest[6] = a02 * b10 + a12 * b11 + a22 * b12;
      dest[7] = a03 * b10 + a13 * b11 + a23 * b12;
  
      dest[8] = a00 * b20 + a10 * b21 + a20 * b22;
      dest[9] = a01 * b20 + a11 * b21 + a21 * b22;
      dest[10] = a02 * b20 + a12 * b21 + a22 * b22;
      dest[11] = a03 * b20 + a13 * b21 + a23 * b22;
      return dest;
  };
  
  /**
   * Rotates a matrix by the given angle around the X axis
   *
   * @param {mat4} mat mat4 to rotate
   * @param {number} angle Angle (in radians) to rotate
   * @param {mat4} [dest] mat4 receiving operation result. If not specified result is written to mat
   */
  mat4.rotateX = function (mat, angle, dest) {
      var s = Math.sin(angle),
          c = Math.cos(angle),
          a10 = mat[4],
          a11 = mat[5],
          a12 = mat[6],
          a13 = mat[7],
          a20 = mat[8],
          a21 = mat[9],
          a22 = mat[10],
          a23 = mat[11];
  
      if (!dest) {
          dest = mat;
      } else if (mat !== dest) { // If the source and destination differ, copy the unchanged rows
          dest[0] = mat[0];
          dest[1] = mat[1];
          dest[2] = mat[2];
          dest[3] = mat[3];
  
          dest[12] = mat[12];
          dest[13] = mat[13];
          dest[14] = mat[14];
          dest[15] = mat[15];
      }
  
      // Perform axis-specific matrix multiplication
      dest[4] = a10 * c + a20 * s;
      dest[5] = a11 * c + a21 * s;
      dest[6] = a12 * c + a22 * s;
      dest[7] = a13 * c + a23 * s;
  
      dest[8] = a10 * -s + a20 * c;
      dest[9] = a11 * -s + a21 * c;
      dest[10] = a12 * -s + a22 * c;
      dest[11] = a13 * -s + a23 * c;
      return dest;
  };
  
  /**
   * Rotates a matrix by the given angle around the Y axis
   *
   * @param {mat4} mat mat4 to rotate
   * @param {number} angle Angle (in radians) to rotate
   * @param {mat4} [dest] mat4 receiving operation result. If not specified result is written to mat
   */
  mat4.rotateY = function (mat, angle, dest) {
      var s = Math.sin(angle),
          c = Math.cos(angle),
          a00 = mat[0],
          a01 = mat[1],
          a02 = mat[2],
          a03 = mat[3],
          a20 = mat[8],
          a21 = mat[9],
          a22 = mat[10],
          a23 = mat[11];
  
      if (!dest) {
          dest = mat;
      } else if (mat !== dest) { // If the source and destination differ, copy the unchanged rows
          dest[4] = mat[4];
          dest[5] = mat[5];
          dest[6] = mat[6];
          dest[7] = mat[7];
  
          dest[12] = mat[12];
          dest[13] = mat[13];
          dest[14] = mat[14];
          dest[15] = mat[15];
      }
  
      // Perform axis-specific matrix multiplication
      dest[0] = a00 * c + a20 * -s;
      dest[1] = a01 * c + a21 * -s;
      dest[2] = a02 * c + a22 * -s;
      dest[3] = a03 * c + a23 * -s;
  
      dest[8] = a00 * s + a20 * c;
      dest[9] = a01 * s + a21 * c;
      dest[10] = a02 * s + a22 * c;
      dest[11] = a03 * s + a23 * c;
      return dest;
  };
  
  /**
   * Rotates a matrix by the given angle around the Z axis
   *
   * @param {mat4} mat mat4 to rotate
   * @param {number} angle Angle (in radians) to rotate
   * @param {mat4} [dest] mat4 receiving operation result. If not specified result is written to mat
   */
  mat4.rotateZ = function (mat, angle, dest) {
      var s = Math.sin(angle),
          c = Math.cos(angle),
          a00 = mat[0],
          a01 = mat[1],
          a02 = mat[2],
          a03 = mat[3],
          a10 = mat[4],
          a11 = mat[5],
          a12 = mat[6],
          a13 = mat[7];
  
      if (!dest) {
          dest = mat;
      } else if (mat !== dest) { // If the source and destination differ, copy the unchanged last row
          dest[8] = mat[8];
          dest[9] = mat[9];
          dest[10] = mat[10];
          dest[11] = mat[11];
  
          dest[12] = mat[12];
          dest[13] = mat[13];
          dest[14] = mat[14];
          dest[15] = mat[15];
      }
  
      // Perform axis-specific matrix multiplication
      dest[0] = a00 * c + a10 * s;
      dest[1] = a01 * c + a11 * s;
      dest[2] = a02 * c + a12 * s;
      dest[3] = a03 * c + a13 * s;
  
      dest[4] = a00 * -s + a10 * c;
      dest[5] = a01 * -s + a11 * c;
      dest[6] = a02 * -s + a12 * c;
      dest[7] = a03 * -s + a13 * c;
  
      return dest;
  };
  
  /**
   * Generates a frustum matrix with the given bounds
   *
   * @param {number} left Left bound of the frustum
   * @param {number} right Right bound of the frustum
   * @param {number} bottom Bottom bound of the frustum
   * @param {number} top Top bound of the frustum
   * @param {number} near Near bound of the frustum
   * @param {number} far Far bound of the frustum
   * @param {mat4} [dest] mat4 frustum matrix will be written into
   *
   * @returns {mat4} dest if specified, a new mat4 otherwise
   */
  mat4.frustum = function (left, right, bottom, top, near, far, dest) {
      if (!dest) { dest = mat4.create(); }
      var rl = (right - left),
          tb = (top - bottom),
          fn = (far - near);
      dest[0] = (near * 2) / rl;
      dest[1] = 0;
      dest[2] = 0;
      dest[3] = 0;
      dest[4] = 0;
      dest[5] = (near * 2) / tb;
      dest[6] = 0;
      dest[7] = 0;
      dest[8] = (right + left) / rl;
      dest[9] = (top + bottom) / tb;
      dest[10] = -(far + near) / fn;
      dest[11] = -1;
      dest[12] = 0;
      dest[13] = 0;
      dest[14] = -(far * near * 2) / fn;
      dest[15] = 0;
      return dest;
  };
  
  /**
   * Generates a perspective projection matrix with the given bounds
   *
   * @param {number} fovy Vertical field of view
   * @param {number} aspect Aspect ratio. typically viewport width/height
   * @param {number} near Near bound of the frustum
   * @param {number} far Far bound of the frustum
   * @param {mat4} [dest] mat4 frustum matrix will be written into
   *
   * @returns {mat4} dest if specified, a new mat4 otherwise
   */
  mat4.perspective = function (fovy, aspect, near, far, dest) {
      var top = near * Math.tan(fovy * Math.PI / 360.0),
          right = top * aspect;
      return mat4.frustum(-right, right, -top, top, near, far, dest);
  };
  
  /**
   * Generates a orthogonal projection matrix with the given bounds
   *
   * @param {number} left Left bound of the frustum
   * @param {number} right Right bound of the frustum
   * @param {number} bottom Bottom bound of the frustum
   * @param {number} top Top bound of the frustum
   * @param {number} near Near bound of the frustum
   * @param {number} far Far bound of the frustum
   * @param {mat4} [dest] mat4 frustum matrix will be written into
   *
   * @returns {mat4} dest if specified, a new mat4 otherwise
   */
  mat4.ortho = function (left, right, bottom, top, near, far, dest) {
      if (!dest) { dest = mat4.create(); }
      var rl = (right - left),
          tb = (top - bottom),
          fn = (far - near);
      dest[0] = 2 / rl;
      dest[1] = 0;
      dest[2] = 0;
      dest[3] = 0;
      dest[4] = 0;
      dest[5] = 2 / tb;
      dest[6] = 0;
      dest[7] = 0;
      dest[8] = 0;
      dest[9] = 0;
      dest[10] = -2 / fn;
      dest[11] = 0;
      dest[12] = -(left + right) / rl;
      dest[13] = -(top + bottom) / tb;
      dest[14] = -(far + near) / fn;
      dest[15] = 1;
      return dest;
  };
  
  /**
   * Generates a look-at matrix with the given eye position, focal point, and up axis
   *
   * @param {vec3} eye Position of the viewer
   * @param {vec3} center Point the viewer is looking at
   * @param {vec3} up vec3 pointing "up"
   * @param {mat4} [dest] mat4 frustum matrix will be written into
   *
   * @returns {mat4} dest if specified, a new mat4 otherwise
   */
  mat4.lookAt = function (eye, center, up, dest) {
      if (!dest) { dest = mat4.create(); }
  
      var x0, x1, x2, y0, y1, y2, z0, z1, z2, len,
          eyex = eye[0],
          eyey = eye[1],
          eyez = eye[2],
          upx = up[0],
          upy = up[1],
          upz = up[2],
          centerx = center[0],
          centery = center[1],
          centerz = center[2];
  
      if (eyex === centerx && eyey === centery && eyez === centerz) {
          return mat4.identity(dest);
      }
  
      //vec3.direction(eye, center, z);
      z0 = eyex - centerx;
      z1 = eyey - centery;
      z2 = eyez - centerz;
  
      // normalize (no check needed for 0 because of early return)
      len = 1 / Math.sqrt(z0 * z0 + z1 * z1 + z2 * z2);
      z0 *= len;
      z1 *= len;
      z2 *= len;
  
      //vec3.normalize(vec3.cross(up, z, x));
      x0 = upy * z2 - upz * z1;
      x1 = upz * z0 - upx * z2;
      x2 = upx * z1 - upy * z0;
      len = Math.sqrt(x0 * x0 + x1 * x1 + x2 * x2);
      if (!len) {
          x0 = 0;
          x1 = 0;
          x2 = 0;
      } else {
          len = 1 / len;
          x0 *= len;
          x1 *= len;
          x2 *= len;
      }
  
      //vec3.normalize(vec3.cross(z, x, y));
      y0 = z1 * x2 - z2 * x1;
      y1 = z2 * x0 - z0 * x2;
      y2 = z0 * x1 - z1 * x0;
  
      len = Math.sqrt(y0 * y0 + y1 * y1 + y2 * y2);
      if (!len) {
          y0 = 0;
          y1 = 0;
          y2 = 0;
      } else {
          len = 1 / len;
          y0 *= len;
          y1 *= len;
          y2 *= len;
      }
  
      dest[0] = x0;
      dest[1] = y0;
      dest[2] = z0;
      dest[3] = 0;
      dest[4] = x1;
      dest[5] = y1;
      dest[6] = z1;
      dest[7] = 0;
      dest[8] = x2;
      dest[9] = y2;
      dest[10] = z2;
      dest[11] = 0;
      dest[12] = -(x0 * eyex + x1 * eyey + x2 * eyez);
      dest[13] = -(y0 * eyex + y1 * eyey + y2 * eyez);
      dest[14] = -(z0 * eyex + z1 * eyey + z2 * eyez);
      dest[15] = 1;
  
      return dest;
  };
  
  /**
   * Creates a matrix from a quaternion rotation and vector translation
   * This is equivalent to (but much faster than):
   *
   *     mat4.identity(dest);
   *     mat4.translate(dest, vec);
   *     var quatMat = mat4.create();
   *     quat4.toMat4(quat, quatMat);
   *     mat4.multiply(dest, quatMat);
   *
   * @param {quat4} quat Rotation quaternion
   * @param {vec3} vec Translation vector
   * @param {mat4} [dest] mat4 receiving operation result. If not specified result is written to a new mat4
   *
   * @returns {mat4} dest if specified, a new mat4 otherwise
   */
  mat4.fromRotationTranslation = function (quat, vec, dest) {
      if (!dest) { dest = mat4.create(); }
  
      // Quaternion math
      var x = quat[0], y = quat[1], z = quat[2], w = quat[3],
          x2 = x + x,
          y2 = y + y,
          z2 = z + z,
  
          xx = x * x2,
          xy = x * y2,
          xz = x * z2,
          yy = y * y2,
          yz = y * z2,
          zz = z * z2,
          wx = w * x2,
          wy = w * y2,
          wz = w * z2;
  
      dest[0] = 1 - (yy + zz);
      dest[1] = xy + wz;
      dest[2] = xz - wy;
      dest[3] = 0;
      dest[4] = xy - wz;
      dest[5] = 1 - (xx + zz);
      dest[6] = yz + wx;
      dest[7] = 0;
      dest[8] = xz + wy;
      dest[9] = yz - wx;
      dest[10] = 1 - (xx + yy);
      dest[11] = 0;
      dest[12] = vec[0];
      dest[13] = vec[1];
      dest[14] = vec[2];
      dest[15] = 1;
  
      return dest;
  };
  
  /**
   * Returns a string representation of a mat4
   *
   * @param {mat4} mat mat4 to represent as a string
   *
   * @returns {string} String representation of mat
   */
  mat4.str = function (mat) {
      return '[' + mat[0] + ', ' + mat[1] + ', ' + mat[2] + ', ' + mat[3] +
          ', ' + mat[4] + ', ' + mat[5] + ', ' + mat[6] + ', ' + mat[7] +
          ', ' + mat[8] + ', ' + mat[9] + ', ' + mat[10] + ', ' + mat[11] +
          ', ' + mat[12] + ', ' + mat[13] + ', ' + mat[14] + ', ' + mat[15] + ']';
  };
  
  /*
   * quat4
   */
  
  /**
   * Creates a new instance of a quat4 using the default array type
   * Any javascript array containing at least 4 numeric elements can serve as a quat4
   *
   * @param {quat4} [quat] quat4 containing values to initialize with
   *
   * @returns {quat4} New quat4
   */
  quat4.create = function (quat) {
      var dest = new MatrixArray(4);
  
      if (quat) {
          dest[0] = quat[0];
          dest[1] = quat[1];
          dest[2] = quat[2];
          dest[3] = quat[3];
      }
  
      return dest;
  };
  
  /**
   * Copies the values of one quat4 to another
   *
   * @param {quat4} quat quat4 containing values to copy
   * @param {quat4} dest quat4 receiving copied values
   *
   * @returns {quat4} dest
   */
  quat4.set = function (quat, dest) {
      dest[0] = quat[0];
      dest[1] = quat[1];
      dest[2] = quat[2];
      dest[3] = quat[3];
  
      return dest;
  };
  
  /**
   * Calculates the W component of a quat4 from the X, Y, and Z components.
   * Assumes that quaternion is 1 unit in length.
   * Any existing W component will be ignored.
   *
   * @param {quat4} quat quat4 to calculate W component of
   * @param {quat4} [dest] quat4 receiving calculated values. If not specified result is written to quat
   *
   * @returns {quat4} dest if specified, quat otherwise
   */
  quat4.calculateW = function (quat, dest) {
      var x = quat[0], y = quat[1], z = quat[2];
  
      if (!dest || quat === dest) {
          quat[3] = -Math.sqrt(Math.abs(1.0 - x * x - y * y - z * z));
          return quat;
      }
      dest[0] = x;
      dest[1] = y;
      dest[2] = z;
      dest[3] = -Math.sqrt(Math.abs(1.0 - x * x - y * y - z * z));
      return dest;
  };
  
  /**
   * Calculates the dot product of two quaternions
   *
   * @param {quat4} quat First operand
   * @param {quat4} quat2 Second operand
   *
   * @return {number} Dot product of quat and quat2
   */
  quat4.dot = function(quat, quat2){
      return quat[0]*quat2[0] + quat[1]*quat2[1] + quat[2]*quat2[2] + quat[3]*quat2[3];
  };
  
  /**
   * Calculates the inverse of a quat4
   *
   * @param {quat4} quat quat4 to calculate inverse of
   * @param {quat4} [dest] quat4 receiving inverse values. If not specified result is written to quat
   *
   * @returns {quat4} dest if specified, quat otherwise
   */
  quat4.inverse = function(quat, dest) {
      var q0 = quat[0], q1 = quat[1], q2 = quat[2], q3 = quat[3],
          dot = q0*q0 + q1*q1 + q2*q2 + q3*q3,
          invDot = dot ? 1.0/dot : 0;
  
      // TODO: Would be faster to return [0,0,0,0] immediately if dot == 0
  
      if(!dest || quat === dest) {
          quat[0] *= -invDot;
          quat[1] *= -invDot;
          quat[2] *= -invDot;
          quat[3] *= invDot;
          return quat;
      }
      dest[0] = -quat[0]*invDot;
      dest[1] = -quat[1]*invDot;
      dest[2] = -quat[2]*invDot;
      dest[3] = quat[3]*invDot;
      return dest;
  };
  
  
  /**
   * Calculates the conjugate of a quat4
   * If the quaternion is normalized, this function is faster than quat4.inverse and produces the same result.
   *
   * @param {quat4} quat quat4 to calculate conjugate of
   * @param {quat4} [dest] quat4 receiving conjugate values. If not specified result is written to quat
   *
   * @returns {quat4} dest if specified, quat otherwise
   */
  quat4.conjugate = function (quat, dest) {
      if (!dest || quat === dest) {
          quat[0] *= -1;
          quat[1] *= -1;
          quat[2] *= -1;
          return quat;
      }
      dest[0] = -quat[0];
      dest[1] = -quat[1];
      dest[2] = -quat[2];
      dest[3] = quat[3];
      return dest;
  };
  
  /**
   * Calculates the length of a quat4
   *
   * Params:
   * @param {quat4} quat quat4 to calculate length of
   *
   * @returns Length of quat
   */
  quat4.length = function (quat) {
      var x = quat[0], y = quat[1], z = quat[2], w = quat[3];
      return Math.sqrt(x * x + y * y + z * z + w * w);
  };
  
  /**
   * Generates a unit quaternion of the same direction as the provided quat4
   * If quaternion length is 0, returns [0, 0, 0, 0]
   *
   * @param {quat4} quat quat4 to normalize
   * @param {quat4} [dest] quat4 receiving operation result. If not specified result is written to quat
   *
   * @returns {quat4} dest if specified, quat otherwise
   */
  quat4.normalize = function (quat, dest) {
      if (!dest) { dest = quat; }
  
      var x = quat[0], y = quat[1], z = quat[2], w = quat[3],
          len = Math.sqrt(x * x + y * y + z * z + w * w);
      if (len === 0) {
          dest[0] = 0;
          dest[1] = 0;
          dest[2] = 0;
          dest[3] = 0;
          return dest;
      }
      len = 1 / len;
      dest[0] = x * len;
      dest[1] = y * len;
      dest[2] = z * len;
      dest[3] = w * len;
  
      return dest;
  };
  
  /**
   * Performs quaternion addition
   *
   * @param {quat4} quat First operand
   * @param {quat4} quat2 Second operand
   * @param {quat4} [dest] quat4 receiving operation result. If not specified result is written to quat
   *
   * @returns {quat4} dest if specified, quat otherwise
   */
  quat4.add = function (quat, quat2, dest) {
      if(!dest || quat === dest) {
          quat[0] += quat2[0];
          quat[1] += quat2[1];
          quat[2] += quat2[2];
          quat[3] += quat2[3];
          return quat;
      }
      dest[0] = quat[0]+quat2[0];
      dest[1] = quat[1]+quat2[1];
      dest[2] = quat[2]+quat2[2];
      dest[3] = quat[3]+quat2[3];
      return dest;
  };
  
  /**
   * Performs a quaternion multiplication
   *
   * @param {quat4} quat First operand
   * @param {quat4} quat2 Second operand
   * @param {quat4} [dest] quat4 receiving operation result. If not specified result is written to quat
   *
   * @returns {quat4} dest if specified, quat otherwise
   */
  quat4.multiply = function (quat, quat2, dest) {
      if (!dest) { dest = quat; }
  
      var qax = quat[0], qay = quat[1], qaz = quat[2], qaw = quat[3],
          qbx = quat2[0], qby = quat2[1], qbz = quat2[2], qbw = quat2[3];
  
      dest[0] = qax * qbw + qaw * qbx + qay * qbz - qaz * qby;
      dest[1] = qay * qbw + qaw * qby + qaz * qbx - qax * qbz;
      dest[2] = qaz * qbw + qaw * qbz + qax * qby - qay * qbx;
      dest[3] = qaw * qbw - qax * qbx - qay * qby - qaz * qbz;
  
      return dest;
  };
  
  /**
   * Transforms a vec3 with the given quaternion
   *
   * @param {quat4} quat quat4 to transform the vector with
   * @param {vec3} vec vec3 to transform
   * @param {vec3} [dest] vec3 receiving operation result. If not specified result is written to vec
   *
   * @returns dest if specified, vec otherwise
   */
  quat4.multiplyVec3 = function (quat, vec, dest) {
      if (!dest) { dest = vec; }
  
      var x = vec[0], y = vec[1], z = vec[2],
          qx = quat[0], qy = quat[1], qz = quat[2], qw = quat[3],
  
          // calculate quat * vec
          ix = qw * x + qy * z - qz * y,
          iy = qw * y + qz * x - qx * z,
          iz = qw * z + qx * y - qy * x,
          iw = -qx * x - qy * y - qz * z;
  
      // calculate result * inverse quat
      dest[0] = ix * qw + iw * -qx + iy * -qz - iz * -qy;
      dest[1] = iy * qw + iw * -qy + iz * -qx - ix * -qz;
      dest[2] = iz * qw + iw * -qz + ix * -qy - iy * -qx;
  
      return dest;
  };
  
  /**
   * Multiplies the components of a quaternion by a scalar value
   *
   * @param {quat4} quat to scale
   * @param {number} val Value to scale by
   * @param {quat4} [dest] quat4 receiving operation result. If not specified result is written to quat
   *
   * @returns {quat4} dest if specified, quat otherwise
   */
  quat4.scale = function (quat, val, dest) {
      if(!dest || quat === dest) {
          quat[0] *= val;
          quat[1] *= val;
          quat[2] *= val;
          quat[3] *= val;
          return quat;
      }
      dest[0] = quat[0]*val;
      dest[1] = quat[1]*val;
      dest[2] = quat[2]*val;
      dest[3] = quat[3]*val;
      return dest;
  };
  
  /**
   * Calculates a 3x3 matrix from the given quat4
   *
   * @param {quat4} quat quat4 to create matrix from
   * @param {mat3} [dest] mat3 receiving operation result
   *
   * @returns {mat3} dest if specified, a new mat3 otherwise
   */
  quat4.toMat3 = function (quat, dest) {
      if (!dest) { dest = mat3.create(); }
  
      var x = quat[0], y = quat[1], z = quat[2], w = quat[3],
          x2 = x + x,
          y2 = y + y,
          z2 = z + z,
  
          xx = x * x2,
          xy = x * y2,
          xz = x * z2,
          yy = y * y2,
          yz = y * z2,
          zz = z * z2,
          wx = w * x2,
          wy = w * y2,
          wz = w * z2;
  
      dest[0] = 1 - (yy + zz);
      dest[1] = xy + wz;
      dest[2] = xz - wy;
  
      dest[3] = xy - wz;
      dest[4] = 1 - (xx + zz);
      dest[5] = yz + wx;
  
      dest[6] = xz + wy;
      dest[7] = yz - wx;
      dest[8] = 1 - (xx + yy);
  
      return dest;
  };
  
  /**
   * Calculates a 4x4 matrix from the given quat4
   *
   * @param {quat4} quat quat4 to create matrix from
   * @param {mat4} [dest] mat4 receiving operation result
   *
   * @returns {mat4} dest if specified, a new mat4 otherwise
   */
  quat4.toMat4 = function (quat, dest) {
      if (!dest) { dest = mat4.create(); }
  
      var x = quat[0], y = quat[1], z = quat[2], w = quat[3],
          x2 = x + x,
          y2 = y + y,
          z2 = z + z,
  
          xx = x * x2,
          xy = x * y2,
          xz = x * z2,
          yy = y * y2,
          yz = y * z2,
          zz = z * z2,
          wx = w * x2,
          wy = w * y2,
          wz = w * z2;
  
      dest[0] = 1 - (yy + zz);
      dest[1] = xy + wz;
      dest[2] = xz - wy;
      dest[3] = 0;
  
      dest[4] = xy - wz;
      dest[5] = 1 - (xx + zz);
      dest[6] = yz + wx;
      dest[7] = 0;
  
      dest[8] = xz + wy;
      dest[9] = yz - wx;
      dest[10] = 1 - (xx + yy);
      dest[11] = 0;
  
      dest[12] = 0;
      dest[13] = 0;
      dest[14] = 0;
      dest[15] = 1;
  
      return dest;
  };
  
  /**
   * Performs a spherical linear interpolation between two quat4
   *
   * @param {quat4} quat First quaternion
   * @param {quat4} quat2 Second quaternion
   * @param {number} slerp Interpolation amount between the two inputs
   * @param {quat4} [dest] quat4 receiving operation result. If not specified result is written to quat
   *
   * @returns {quat4} dest if specified, quat otherwise
   */
  quat4.slerp = function (quat, quat2, slerp, dest) {
      if (!dest) { dest = quat; }
  
      var cosHalfTheta = quat[0] * quat2[0] + quat[1] * quat2[1] + quat[2] * quat2[2] + quat[3] * quat2[3],
          halfTheta,
          sinHalfTheta,
          ratioA,
          ratioB;
  
      if (Math.abs(cosHalfTheta) >= 1.0) {
          if (dest !== quat) {
              dest[0] = quat[0];
              dest[1] = quat[1];
              dest[2] = quat[2];
              dest[3] = quat[3];
          }
          return dest;
      }
  
      halfTheta = Math.acos(cosHalfTheta);
      sinHalfTheta = Math.sqrt(1.0 - cosHalfTheta * cosHalfTheta);
  
      if (Math.abs(sinHalfTheta) < 0.001) {
          dest[0] = (quat[0] * 0.5 + quat2[0] * 0.5);
          dest[1] = (quat[1] * 0.5 + quat2[1] * 0.5);
          dest[2] = (quat[2] * 0.5 + quat2[2] * 0.5);
          dest[3] = (quat[3] * 0.5 + quat2[3] * 0.5);
          return dest;
      }
  
      ratioA = Math.sin((1 - slerp) * halfTheta) / sinHalfTheta;
      ratioB = Math.sin(slerp * halfTheta) / sinHalfTheta;
  
      dest[0] = (quat[0] * ratioA + quat2[0] * ratioB);
      dest[1] = (quat[1] * ratioA + quat2[1] * ratioB);
      dest[2] = (quat[2] * ratioA + quat2[2] * ratioB);
      dest[3] = (quat[3] * ratioA + quat2[3] * ratioB);
  
      return dest;
  };
  
  /**
   * Returns a string representation of a quaternion
   *
   * @param {quat4} quat quat4 to represent as a string
   *
   * @returns {string} String representation of quat
   */
  quat4.str = function (quat) {
      return '[' + quat[0] + ', ' + quat[1] + ', ' + quat[2] + ', ' + quat[3] + ']';
  };
  
  
  return {
    vec3: vec3,
    mat3: mat3,
    mat4: mat4,
    quat4: quat4
  };
  
  })();
  
  ;
  
  var GLImmediateSetup={};
  function _glBegin(mode) {
      // Push the old state:
      GLImmediate.enabledClientAttributes_preBegin = GLImmediate.enabledClientAttributes;
      GLImmediate.enabledClientAttributes = [];
  
      GLImmediate.clientAttributes_preBegin = GLImmediate.clientAttributes;
      GLImmediate.clientAttributes = []
      for (var i = 0; i < GLImmediate.clientAttributes_preBegin.length; i++) {
        GLImmediate.clientAttributes.push({});
      }
  
      GLImmediate.mode = mode;
      GLImmediate.vertexCounter = 0;
      var components = GLImmediate.rendererComponents = [];
      for (var i = 0; i < GLImmediate.NUM_ATTRIBUTES; i++) {
        components[i] = 0;
      }
      GLImmediate.rendererComponentPointer = 0;
      GLImmediate.vertexData = GLImmediate.tempData;
    }

  function _glBindTexture(target, texture) {
      GLctx.bindTexture(target, GL.textures[texture]);
    }

  function _glBlendFunc(x0, x1) { GLctx['blendFunc'](x0, x1) }

  function _glClear(x0) { GLctx['clear'](x0) }

  function _glClearColor(x0, x1, x2, x3) { GLctx['clearColor'](x0, x1, x2, x3) }

  function _emscripten_glColor4f(r, g, b, a) {
      r = Math.max(Math.min(r, 1), 0);
      g = Math.max(Math.min(g, 1), 0);
      b = Math.max(Math.min(b, 1), 0);
      a = Math.max(Math.min(a, 1), 0);
  
      // TODO: make ub the default, not f, save a few mathops
      if (GLImmediate.mode >= 0) {
        var start = GLImmediate.vertexCounter << 2;
        GLImmediate.vertexDataU8[start + 0] = r * 255;
        GLImmediate.vertexDataU8[start + 1] = g * 255;
        GLImmediate.vertexDataU8[start + 2] = b * 255;
        GLImmediate.vertexDataU8[start + 3] = a * 255;
        GLImmediate.vertexCounter++;
        GLImmediate.addRendererComponent(GLImmediate.COLOR, 4, GLctx.UNSIGNED_BYTE);
      } else {
        GLImmediate.clientColor[0] = r;
        GLImmediate.clientColor[1] = g;
        GLImmediate.clientColor[2] = b;
        GLImmediate.clientColor[3] = a;
        GLctx.vertexAttrib4fv(GLImmediate.COLOR, GLImmediate.clientColor);
      }
    }
  function _glColor3f(r, g, b) {
      _emscripten_glColor4f(r, g, b, 1);
    }

  function _glColor4f(r, g, b, a) {
      r = Math.max(Math.min(r, 1), 0);
      g = Math.max(Math.min(g, 1), 0);
      b = Math.max(Math.min(b, 1), 0);
      a = Math.max(Math.min(a, 1), 0);
  
      // TODO: make ub the default, not f, save a few mathops
      if (GLImmediate.mode >= 0) {
        var start = GLImmediate.vertexCounter << 2;
        GLImmediate.vertexDataU8[start + 0] = r * 255;
        GLImmediate.vertexDataU8[start + 1] = g * 255;
        GLImmediate.vertexDataU8[start + 2] = b * 255;
        GLImmediate.vertexDataU8[start + 3] = a * 255;
        GLImmediate.vertexCounter++;
        GLImmediate.addRendererComponent(GLImmediate.COLOR, 4, GLctx.UNSIGNED_BYTE);
      } else {
        GLImmediate.clientColor[0] = r;
        GLImmediate.clientColor[1] = g;
        GLImmediate.clientColor[2] = b;
        GLImmediate.clientColor[3] = a;
        GLctx.vertexAttrib4fv(GLImmediate.COLOR, GLImmediate.clientColor);
      }
    }

  function _glColorPointer(size, type, stride, pointer) {
      GLImmediate.setClientAttribute(GLImmediate.COLOR, size, type, stride, pointer);
      if (GLctx.currentArrayBufferBinding) {
        GLctx.vertexAttribPointer(GLImmediate.COLOR, size, type, true, stride, pointer);
      }
    }

  function _glCullFace(x0) { GLctx['cullFace'](x0) }

  function _glDeleteTextures(n, textures) {
      for (var i = 0; i < n; i++) {
        var id = HEAP32[(((textures)+(i*4))>>2)];
        var texture = GL.textures[id];
        if (!texture) continue; // GL spec: "glDeleteTextures silently ignores 0s and names that do not correspond to existing textures".
        GLctx.deleteTexture(texture);
        texture.name = 0;
        GL.textures[id] = null;
      }
    }

  function _glDepthFunc(x0) { GLctx['depthFunc'](x0) }

  function _glDepthMask(flag) {
      GLctx.depthMask(!!flag);
    }


  function _glDisableClientState(cap) {
      var attrib = GLEmulation.getAttributeFromCapability(cap);
      if (attrib === null) {
        err('WARNING: unhandled clientstate: ' + cap);
        return;
      }
      if (GLImmediate.enabledClientAttributes[attrib]) {
        GLImmediate.enabledClientAttributes[attrib] = false;
        GLImmediate.totalEnabledClientAttributes--;
        GLImmediate.currentRenderer = null; // Will need to change current renderer, since the set of active vertex pointers changed.
        // In GL_FFP_ONLY mode, attributes are bound to the same index in each FFP emulation shader, so we can immediately apply the change here.
        GL.disableVertexAttribArray(attrib);
        if (GLEmulation.currentVao) delete GLEmulation.currentVao.enabledClientStates[cap];
        GLImmediate.modifiedClientAttributes = true;
      }
    }

  function _glDrawArrays(mode, first, count) {
      if (GLImmediate.totalEnabledClientAttributes == 0 && mode <= 6) {
        GLctx.drawArrays(mode, first, count);
        return;
      }
      GLImmediate.prepareClientAttributes(count, false);
      GLImmediate.mode = mode;
      if (!GLctx.currentArrayBufferBinding) {
        GLImmediate.vertexData = HEAPF32.subarray((GLImmediate.vertexPointer)>>2, (GLImmediate.vertexPointer + (first+count)*GLImmediate.stride)>>2); // XXX assuming float
        GLImmediate.firstVertex = first;
        GLImmediate.lastVertex = first + count;
      }
      GLImmediate.flush(null, first);
      GLImmediate.mode = -1;
    }


  function _glEnableClientState(cap) {
      var attrib = GLEmulation.getAttributeFromCapability(cap);
      if (attrib === null) {
        err('WARNING: unhandled clientstate: ' + cap);
        return;
      }
      if (!GLImmediate.enabledClientAttributes[attrib]) {
        GLImmediate.enabledClientAttributes[attrib] = true;
        GLImmediate.totalEnabledClientAttributes++;
        GLImmediate.currentRenderer = null; // Will need to change current renderer, since the set of active vertex pointers changed.
        // In GL_FFP_ONLY mode, attributes are bound to the same index in each FFP emulation shader, so we can immediately apply the change here.
        GL.enableVertexAttribArray(attrib);
        if (GLEmulation.currentVao) GLEmulation.currentVao.enabledClientStates[cap] = 1;
        GLImmediate.modifiedClientAttributes = true;
      }
    }

  function _glEnd() {
      GLImmediate.prepareClientAttributes(GLImmediate.rendererComponents[GLImmediate.VERTEX], true);
      GLImmediate.firstVertex = 0;
      GLImmediate.lastVertex = GLImmediate.vertexCounter / (GLImmediate.stride >> 2);
      GLImmediate.flush();
      GLImmediate.disableBeginEndClientAttributes();
      GLImmediate.mode = -1;
  
      // Pop the old state:
      GLImmediate.enabledClientAttributes = GLImmediate.enabledClientAttributes_preBegin;
      GLImmediate.clientAttributes = GLImmediate.clientAttributes_preBegin;
      GLImmediate.currentRenderer = null; // The set of active client attributes changed, we must re-lookup the renderer to use.
      GLImmediate.modifiedClientAttributes = true;
    }

  function __glGenObject(n, buffers, createFunction, objectTable
      ) {
      for (var i = 0; i < n; i++) {
        var buffer = GLctx[createFunction]();
        var id = buffer && GL.getNewId(objectTable);
        if (buffer) {
          buffer.name = id;
          objectTable[id] = buffer;
        } else {
          GL.recordError(0x502 /* GL_INVALID_OPERATION */);
        }
        HEAP32[(((buffers)+(i*4))>>2)] = id;
      }
    }
  function _glGenTextures(n, textures) {
      __glGenObject(n, textures, 'createTexture', GL.textures
        );
    }


  function _glLoadIdentity() {
      GLImmediate.matricesModified = true;
      GLImmediate.matrixVersion[GLImmediate.currentMatrix] = (GLImmediate.matrixVersion[GLImmediate.currentMatrix] + 1)|0;
      GLImmediate.matrixLib.mat4.identity(GLImmediate.matrix[GLImmediate.currentMatrix]);
    }

  function _glLoadMatrixf(matrix) {
      GLImmediate.matricesModified = true;
      GLImmediate.matrixVersion[GLImmediate.currentMatrix] = (GLImmediate.matrixVersion[GLImmediate.currentMatrix] + 1)|0;
      GLImmediate.matrixLib.mat4.set(HEAPF32.subarray((matrix)>>2, (matrix+64)>>2), GLImmediate.matrix[GLImmediate.currentMatrix]);
    }

  function _glMatrixMode(mode) {
      if (mode == 0x1700 /* GL_MODELVIEW */) {
        GLImmediate.currentMatrix = 0/*m*/;
      } else if (mode == 0x1701 /* GL_PROJECTION */) {
        GLImmediate.currentMatrix = 1/*p*/;
      } else if (mode == 0x1702) { // GL_TEXTURE
        GLImmediate.useTextureMatrix = true;
        GLImmediate.currentMatrix = 2/*t*/ + GLImmediate.TexEnvJIT.getActiveTexture();
      } else {
        throw "Wrong mode " + mode + " passed to glMatrixMode";
      }
    }

  function _glPolygonMode(){}

  function _glPopMatrix() {
      if (GLImmediate.matrixStack[GLImmediate.currentMatrix].length == 0) {
        GL.recordError(0x504/*GL_STACK_UNDERFLOW*/);
        return;
      }
      GLImmediate.matricesModified = true;
      GLImmediate.matrixVersion[GLImmediate.currentMatrix] = (GLImmediate.matrixVersion[GLImmediate.currentMatrix] + 1)|0;
      GLImmediate.matrix[GLImmediate.currentMatrix] = GLImmediate.matrixStack[GLImmediate.currentMatrix].pop();
    }

  function _glPushMatrix() {
      GLImmediate.matricesModified = true;
      GLImmediate.matrixVersion[GLImmediate.currentMatrix] = (GLImmediate.matrixVersion[GLImmediate.currentMatrix] + 1)|0;
      GLImmediate.matrixStack[GLImmediate.currentMatrix].push(
          Array.prototype.slice.call(GLImmediate.matrix[GLImmediate.currentMatrix]));
    }

  function _glRotatef(angle, x, y, z) {
      GLImmediate.matricesModified = true;
      GLImmediate.matrixVersion[GLImmediate.currentMatrix] = (GLImmediate.matrixVersion[GLImmediate.currentMatrix] + 1)|0;
      GLImmediate.matrixLib.mat4.rotate(GLImmediate.matrix[GLImmediate.currentMatrix], angle*Math.PI/180, [x, y, z]);
    }

  function _glScalef(x, y, z) {
      GLImmediate.matricesModified = true;
      GLImmediate.matrixVersion[GLImmediate.currentMatrix] = (GLImmediate.matrixVersion[GLImmediate.currentMatrix] + 1)|0;
      GLImmediate.matrixLib.mat4.scale(GLImmediate.matrix[GLImmediate.currentMatrix], [x, y, z]);
    }

  function _glTexCoordPointer(size, type, stride, pointer) {
      GLImmediate.setClientAttribute(GLImmediate.TEXTURE0 + GLImmediate.clientActiveTexture, size, type, stride, pointer);
      if (GLctx.currentArrayBufferBinding) {
        var loc = GLImmediate.TEXTURE0 + GLImmediate.clientActiveTexture;
        GLctx.vertexAttribPointer(loc, size, type, false, stride, pointer);
      }
    }

  function computeUnpackAlignedImageSize(width, height, sizePerPixel, alignment) {
      function roundedToNextMultipleOf(x, y) {
        return (x + y - 1) & -y;
      }
      var plainRowSize = width * sizePerPixel;
      var alignedRowSize = roundedToNextMultipleOf(plainRowSize, alignment);
      return height * alignedRowSize;
    }
  
  function __colorChannelsInGlTextureFormat(format) {
      // Micro-optimizations for size: map format to size by subtracting smallest enum value (0x1902) from all values first.
      // Also omit the most common size value (1) from the list, which is assumed by formats not on the list.
      var colorChannels = {
        // 0x1902 /* GL_DEPTH_COMPONENT */ - 0x1902: 1,
        // 0x1906 /* GL_ALPHA */ - 0x1902: 1,
        5: 3,
        6: 4,
        // 0x1909 /* GL_LUMINANCE */ - 0x1902: 1,
        8: 2,
        29502: 3,
        29504: 4,
      };
      return colorChannels[format - 0x1902]||1;
    }
  
  function heapObjectForWebGLType(type) {
      // Micro-optimization for size: Subtract lowest GL enum number (0x1400/* GL_BYTE */) from type to compare
      // smaller values for the heap, for shorter generated code size.
      // Also the type HEAPU16 is not tested for explicitly, but any unrecognized type will return out HEAPU16.
      // (since most types are HEAPU16)
      type -= 0x1400;
  
      if (type == 1) return HEAPU8;
  
      if (type == 4) return HEAP32;
  
      if (type == 6) return HEAPF32;
  
      if (type == 5
        || type == 28922
        )
        return HEAPU32;
  
      return HEAPU16;
    }
  
  function heapAccessShiftForWebGLHeap(heap) {
      return 31 - Math.clz32(heap.BYTES_PER_ELEMENT);
    }
  function emscriptenWebGLGetTexPixelData(type, format, width, height, pixels, internalFormat) {
      var heap = heapObjectForWebGLType(type);
      var shift = heapAccessShiftForWebGLHeap(heap);
      var byteSize = 1<<shift;
      var sizePerPixel = __colorChannelsInGlTextureFormat(format) * byteSize;
      var bytes = computeUnpackAlignedImageSize(width, height, sizePerPixel, GL.unpackAlignment);
      return heap.subarray(pixels >> shift, pixels + bytes >> shift);
    }
  function _glTexImage2D(target, level, internalFormat, width, height, border, format, type, pixels) {
      GLctx.texImage2D(target, level, internalFormat, width, height, border, format, type, pixels ? emscriptenWebGLGetTexPixelData(type, format, width, height, pixels, internalFormat) : null);
    }

  function _glTexParameteri(x0, x1, x2) { GLctx['texParameteri'](x0, x1, x2) }

  function _glTranslatef(x, y, z) {
      GLImmediate.matricesModified = true;
      GLImmediate.matrixVersion[GLImmediate.currentMatrix] = (GLImmediate.matrixVersion[GLImmediate.currentMatrix] + 1)|0;
      GLImmediate.matrixLib.mat4.translate(GLImmediate.matrix[GLImmediate.currentMatrix], [x, y, z]);
    }

  function _glVertex3f(x, y, z) {
      assert(GLImmediate.mode >= 0); // must be in begin/end
      GLImmediate.vertexData[GLImmediate.vertexCounter++] = x;
      GLImmediate.vertexData[GLImmediate.vertexCounter++] = y;
      GLImmediate.vertexData[GLImmediate.vertexCounter++] = z;
      GLImmediate.vertexData[GLImmediate.vertexCounter++] = 1;
      assert(GLImmediate.vertexCounter << 2 < GL.MAX_TEMP_BUFFER_SIZE);
      GLImmediate.addRendererComponent(GLImmediate.VERTEX, 4, GLctx.FLOAT);
    }

  function _emscripten_glVertex3f(x, y, z) {
      assert(GLImmediate.mode >= 0); // must be in begin/end
      GLImmediate.vertexData[GLImmediate.vertexCounter++] = x;
      GLImmediate.vertexData[GLImmediate.vertexCounter++] = y;
      GLImmediate.vertexData[GLImmediate.vertexCounter++] = z;
      GLImmediate.vertexData[GLImmediate.vertexCounter++] = 1;
      assert(GLImmediate.vertexCounter << 2 < GL.MAX_TEMP_BUFFER_SIZE);
      GLImmediate.addRendererComponent(GLImmediate.VERTEX, 4, GLctx.FLOAT);
    }
  function _glVertex3fv(p) {
      _emscripten_glVertex3f(HEAPF32[((p)>>2)], HEAPF32[(((p)+(4))>>2)], HEAPF32[(((p)+(8))>>2)]);
    }

  function _glVertexPointer(size, type, stride, pointer) {
      GLImmediate.setClientAttribute(GLImmediate.VERTEX, size, type, stride, pointer);
      if (GLctx.currentArrayBufferBinding) {
        GLctx.vertexAttribPointer(GLImmediate.VERTEX, size, type, false, stride, pointer);
      }
    }

  function _glViewport(x0, x1, x2, x3) { GLctx['viewport'](x0, x1, x2, x3) }

  /** @constructor */
  function GLFW_Window(id, width, height, title, monitor, share) {
        this.id = id;
        this.x = 0;
        this.y = 0;
        this.fullscreen = false; // Used to determine if app in fullscreen mode
        this.storedX = 0; // Used to store X before fullscreen
        this.storedY = 0; // Used to store Y before fullscreen
        this.width = width;
        this.height = height;
        this.storedWidth = width; // Used to store width before fullscreen
        this.storedHeight = height; // Used to store height before fullscreen
        this.title = title;
        this.monitor = monitor;
        this.share = share;
        this.attributes = GLFW.hints;
        this.inputModes = {
          0x00033001:0x00034001, // GLFW_CURSOR (GLFW_CURSOR_NORMAL)
          0x00033002:0, // GLFW_STICKY_KEYS
          0x00033003:0, // GLFW_STICKY_MOUSE_BUTTONS
        };
        this.buttons = 0;
        this.keys = new Array();
        this.domKeys = new Array();
        this.shouldClose = 0;
        this.title = null;
        this.windowPosFunc = null; // GLFWwindowposfun
        this.windowSizeFunc = null; // GLFWwindowsizefun
        this.windowCloseFunc = null; // GLFWwindowclosefun
        this.windowRefreshFunc = null; // GLFWwindowrefreshfun
        this.windowFocusFunc = null; // GLFWwindowfocusfun
        this.windowIconifyFunc = null; // GLFWwindowiconifyfun
        this.framebufferSizeFunc = null; // GLFWframebuffersizefun
        this.mouseButtonFunc = null; // GLFWmousebuttonfun
        this.cursorPosFunc = null; // GLFWcursorposfun
        this.cursorEnterFunc = null; // GLFWcursorenterfun
        this.scrollFunc = null; // GLFWscrollfun
        this.dropFunc = null; // GLFWdropfun
        this.keyFunc = null; // GLFWkeyfun
        this.charFunc = null; // GLFWcharfun
        this.userptr = null;
      }
  var GLFW={WindowFromId:function(id) {
        if (id <= 0 || !GLFW.windows) return null;
        return GLFW.windows[id - 1];
      },joystickFunc:null,errorFunc:null,monitorFunc:null,active:null,windows:null,monitors:null,monitorString:null,versionString:null,initialTime:null,extensions:null,hints:null,defaultHints:{131073:0,131074:0,131075:1,131076:1,131077:1,135169:8,135170:8,135171:8,135172:8,135173:24,135174:8,135175:0,135176:0,135177:0,135178:0,135179:0,135180:0,135181:0,135182:0,135183:0,139265:196609,139266:1,139267:0,139268:0,139269:0,139270:0,139271:0,139272:0},DOMToGLFWKeyCode:function(keycode) {
        switch (keycode) {
          // these keycodes are only defined for GLFW3, assume they are the same for GLFW2
          case 0x20:return 32; // DOM_VK_SPACE -> GLFW_KEY_SPACE
          case 0xDE:return 39; // DOM_VK_QUOTE -> GLFW_KEY_APOSTROPHE
          case 0xBC:return 44; // DOM_VK_COMMA -> GLFW_KEY_COMMA
          case 0xAD:return 45; // DOM_VK_HYPHEN_MINUS -> GLFW_KEY_MINUS
          case 0xBD:return 45; // DOM_VK_MINUS -> GLFW_KEY_MINUS
          case 0xBE:return 46; // DOM_VK_PERIOD -> GLFW_KEY_PERIOD
          case 0xBF:return 47; // DOM_VK_SLASH -> GLFW_KEY_SLASH
          case 0x30:return 48; // DOM_VK_0 -> GLFW_KEY_0
          case 0x31:return 49; // DOM_VK_1 -> GLFW_KEY_1
          case 0x32:return 50; // DOM_VK_2 -> GLFW_KEY_2
          case 0x33:return 51; // DOM_VK_3 -> GLFW_KEY_3
          case 0x34:return 52; // DOM_VK_4 -> GLFW_KEY_4
          case 0x35:return 53; // DOM_VK_5 -> GLFW_KEY_5
          case 0x36:return 54; // DOM_VK_6 -> GLFW_KEY_6
          case 0x37:return 55; // DOM_VK_7 -> GLFW_KEY_7
          case 0x38:return 56; // DOM_VK_8 -> GLFW_KEY_8
          case 0x39:return 57; // DOM_VK_9 -> GLFW_KEY_9
          case 0x3B:return 59; // DOM_VK_SEMICOLON -> GLFW_KEY_SEMICOLON
          case 0x3D:return 61; // DOM_VK_EQUALS -> GLFW_KEY_EQUAL
          case 0xBB:return 61; // DOM_VK_EQUALS -> GLFW_KEY_EQUAL
          case 0x41:return 65; // DOM_VK_A -> GLFW_KEY_A
          case 0x42:return 66; // DOM_VK_B -> GLFW_KEY_B
          case 0x43:return 67; // DOM_VK_C -> GLFW_KEY_C
          case 0x44:return 68; // DOM_VK_D -> GLFW_KEY_D
          case 0x45:return 69; // DOM_VK_E -> GLFW_KEY_E
          case 0x46:return 70; // DOM_VK_F -> GLFW_KEY_F
          case 0x47:return 71; // DOM_VK_G -> GLFW_KEY_G
          case 0x48:return 72; // DOM_VK_H -> GLFW_KEY_H
          case 0x49:return 73; // DOM_VK_I -> GLFW_KEY_I
          case 0x4A:return 74; // DOM_VK_J -> GLFW_KEY_J
          case 0x4B:return 75; // DOM_VK_K -> GLFW_KEY_K
          case 0x4C:return 76; // DOM_VK_L -> GLFW_KEY_L
          case 0x4D:return 77; // DOM_VK_M -> GLFW_KEY_M
          case 0x4E:return 78; // DOM_VK_N -> GLFW_KEY_N
          case 0x4F:return 79; // DOM_VK_O -> GLFW_KEY_O
          case 0x50:return 80; // DOM_VK_P -> GLFW_KEY_P
          case 0x51:return 81; // DOM_VK_Q -> GLFW_KEY_Q
          case 0x52:return 82; // DOM_VK_R -> GLFW_KEY_R
          case 0x53:return 83; // DOM_VK_S -> GLFW_KEY_S
          case 0x54:return 84; // DOM_VK_T -> GLFW_KEY_T
          case 0x55:return 85; // DOM_VK_U -> GLFW_KEY_U
          case 0x56:return 86; // DOM_VK_V -> GLFW_KEY_V
          case 0x57:return 87; // DOM_VK_W -> GLFW_KEY_W
          case 0x58:return 88; // DOM_VK_X -> GLFW_KEY_X
          case 0x59:return 89; // DOM_VK_Y -> GLFW_KEY_Y
          case 0x5a:return 90; // DOM_VK_Z -> GLFW_KEY_Z
          case 0xDB:return 91; // DOM_VK_OPEN_BRACKET -> GLFW_KEY_LEFT_BRACKET
          case 0xDC:return 92; // DOM_VK_BACKSLASH -> GLFW_KEY_BACKSLASH
          case 0xDD:return 93; // DOM_VK_CLOSE_BRACKET -> GLFW_KEY_RIGHT_BRACKET
          case 0xC0:return 94; // DOM_VK_BACK_QUOTE -> GLFW_KEY_GRAVE_ACCENT
  
          //#define GLFW_KEY_SPECIAL      256
          case 0x1B:return (256+1); // DOM_VK_ESCAPE -> GLFW_KEY_ESC
          case 0x70:return (256+2); // DOM_VK_F1 -> GLFW_KEY_F1
          case 0x71:return (256+3); // DOM_VK_F2 -> GLFW_KEY_F2
          case 0x72:return (256+4); // DOM_VK_F3 -> GLFW_KEY_F3
          case 0x73:return (256+5); // DOM_VK_F4 -> GLFW_KEY_F4
          case 0x74:return (256+6); // DOM_VK_F5 -> GLFW_KEY_F5
          case 0x75:return (256+7); // DOM_VK_F6 -> GLFW_KEY_F6
          case 0x76:return (256+8); // DOM_VK_F7 -> GLFW_KEY_F7
          case 0x77:return (256+9); // DOM_VK_F8 -> GLFW_KEY_F8
          case 0x78:return (256+10); // DOM_VK_F9 -> GLFW_KEY_F9
          case 0x79:return (256+11); // DOM_VK_F10 -> GLFW_KEY_F10
          case 0x7A:return (256+12); // DOM_VK_F11 -> GLFW_KEY_F11
          case 0x7B:return (256+13); // DOM_VK_F12 -> GLFW_KEY_F12
          case 0x7C:return (256+14); // DOM_VK_F13 -> GLFW_KEY_F13
          case 0x7D:return (256+15); // DOM_VK_F14 -> GLFW_KEY_F14
          case 0x7E:return (256+16); // DOM_VK_F15 -> GLFW_KEY_F15
          case 0x7F:return (256+17); // DOM_VK_F16 -> GLFW_KEY_F16
          case 0x80:return (256+18); // DOM_VK_F17 -> GLFW_KEY_F17
          case 0x81:return (256+19); // DOM_VK_F18 -> GLFW_KEY_F18
          case 0x82:return (256+20); // DOM_VK_F19 -> GLFW_KEY_F19
          case 0x83:return (256+21); // DOM_VK_F20 -> GLFW_KEY_F20
          case 0x84:return (256+22); // DOM_VK_F21 -> GLFW_KEY_F21
          case 0x85:return (256+23); // DOM_VK_F22 -> GLFW_KEY_F22
          case 0x86:return (256+24); // DOM_VK_F23 -> GLFW_KEY_F23
          case 0x87:return (256+25); // DOM_VK_F24 -> GLFW_KEY_F24
          case 0x88:return (256+26); // 0x88 (not used?) -> GLFW_KEY_F25
          case 0x27:return (256+30); // DOM_VK_RIGHT -> GLFW_KEY_RIGHT
          case 0x25:return (256+29); // DOM_VK_LEFT -> GLFW_KEY_LEFT
          case 0x28:return (256+28); // DOM_VK_DOWN -> GLFW_KEY_DOWN
          case 0x26:return (256+27); // DOM_VK_UP -> GLFW_KEY_UP
          case 0x10:return (256+31); // DOM_VK_SHIFT -> GLFW_KEY_LSHIFT
          // #define GLFW_KEY_RSHIFT       (GLFW_KEY_SPECIAL+32)
          case 0x11:return (256+33); // DOM_VK_CONTROL -> GLFW_KEY_LCTRL
          // #define GLFW_KEY_RCTRL        (GLFW_KEY_SPECIAL+34)
          case 0x12:return (256+35); // DOM_VK_ALT -> GLFW_KEY_LALT
          // #define GLFW_KEY_RALT         (GLFW_KEY_SPECIAL+36)
          case 0x09:return (256+37); // DOM_VK_TAB -> GLFW_KEY_TAB
          case 0x0D:return (256+38); // DOM_VK_RETURN -> GLFW_KEY_ENTER
          case 0x08:return (256+39); // DOM_VK_BACK -> GLFW_KEY_BACKSPACE
          case 0x2D:return (256+40); // DOM_VK_INSERT -> GLFW_KEY_INSERT
          case 0x2E:return (256+41); // DOM_VK_DELETE -> GLFW_KEY_DEL
          case 0x21:return (256+42); // DOM_VK_PAGE_UP -> GLFW_KEY_PAGEUP
          case 0x22:return (256+43); // DOM_VK_PAGE_DOWN -> GLFW_KEY_PAGEDOWN
          case 0x24:return (256+44); // DOM_VK_HOME -> GLFW_KEY_HOME
          case 0x23:return (256+45); // DOM_VK_END -> GLFW_KEY_END
          case 0x60:return (256+46); // DOM_VK_NUMPAD0 -> GLFW_KEY_KP_0
          case 0x61:return (256+47); // DOM_VK_NUMPAD1 -> GLFW_KEY_KP_1
          case 0x62:return (256+48); // DOM_VK_NUMPAD2 -> GLFW_KEY_KP_2
          case 0x63:return (256+49); // DOM_VK_NUMPAD3 -> GLFW_KEY_KP_3
          case 0x64:return (256+50); // DOM_VK_NUMPAD4 -> GLFW_KEY_KP_4
          case 0x65:return (256+51); // DOM_VK_NUMPAD5 -> GLFW_KEY_KP_5
          case 0x66:return (256+52); // DOM_VK_NUMPAD6 -> GLFW_KEY_KP_6
          case 0x67:return (256+53); // DOM_VK_NUMPAD7 -> GLFW_KEY_KP_7
          case 0x68:return (256+54); // DOM_VK_NUMPAD8 -> GLFW_KEY_KP_8
          case 0x69:return (256+55); // DOM_VK_NUMPAD9 -> GLFW_KEY_KP_9
          case 0x6F:return (256+56); // DOM_VK_DIVIDE -> GLFW_KEY_KP_DIVIDE
          case 0x6A:return (256+57); // DOM_VK_MULTIPLY -> GLFW_KEY_KP_MULTIPLY
          case 0x6D:return (256+58); // DOM_VK_SUBTRACT -> GLFW_KEY_KP_SUBTRACT
          case 0x6B:return (256+59); // DOM_VK_ADD -> GLFW_KEY_KP_ADD
          case 0x6E:return (256+60); // DOM_VK_DECIMAL -> GLFW_KEY_KP_DECIMAL
          // #define GLFW_KEY_KP_EQUAL     (GLFW_KEY_SPECIAL+61)
          // #define GLFW_KEY_KP_ENTER     (GLFW_KEY_SPECIAL+62)
          case 0x90:return (256+63); // DOM_VK_NUM_LOCK -> GLFW_KEY_KP_NUM_LOCK
          case 0x14:return (256+64); // DOM_VK_CAPS_LOCK -> GLFW_KEY_CAPS_LOCK
          case 0x91:return (256+65); // DOM_VK_SCROLL_LOCK -> GLFW_KEY_SCROLL_LOCK
          case 0x13:return (256+66); // DOM_VK_PAUSE -> GLFW_KEY_PAUSE
          case 0x5B:return (256+67); // DOM_VK_WIN -> GLFW_KEY_LSUPER
          // #define GLFW_KEY_RSUPER       (GLFW_KEY_SPECIAL+68)
          case 0x5D:return (256+69); // DOM_VK_CONTEXT_MENU -> GLFW_KEY_MENU
  
          default:return -1; // GLFW_KEY_UNKNOWN
        };
      },getModBits:function(win) {
        var mod = 0;
        if (win.keys[340]) mod |= 0x0001; // GLFW_MOD_SHIFT
        if (win.keys[341]) mod |= 0x0002; // GLFW_MOD_CONTROL
        if (win.keys[342]) mod |= 0x0004; // GLFW_MOD_ALT
        if (win.keys[343]) mod |= 0x0008; // GLFW_MOD_SUPER
        return mod;
      },onKeyPress:function(event) {
        if (!GLFW.active || !GLFW.active.charFunc) return;
        if (event.ctrlKey || event.metaKey) return;
  
        // correct unicode charCode is only available with onKeyPress event
        var charCode = event.charCode;
        if (charCode == 0 || (charCode >= 0x00 && charCode <= 0x1F)) return;
  
        (function(a1, a2) {  dynCall_vii.apply(null, [GLFW.active.charFunc, a1, a2]); })(charCode, 1);
  
      },onKeyChanged:function(keyCode, status) {
        if (!GLFW.active) return;
  
        var key = GLFW.DOMToGLFWKeyCode(keyCode);
        if (key == -1) return;
  
        GLFW.active.keys[key] = status;
        GLFW.active.domKeys[keyCode] = status;
        if (!GLFW.active.keyFunc) return;
  
        (function(a1, a2) {  dynCall_vii.apply(null, [GLFW.active.keyFunc, a1, a2]); })(key, status);
  
      },onGamepadConnected:function(event) {
        GLFW.refreshJoysticks();
      },onGamepadDisconnected:function(event) {
        GLFW.refreshJoysticks();
      },onKeydown:function(event) {
        GLFW.onKeyChanged(event.keyCode, 1); // GLFW_PRESS or GLFW_REPEAT
  
        // This logic comes directly from the sdl implementation. We cannot
        // call preventDefault on all keydown events otherwise onKeyPress will
        // not get called
        if (event.keyCode === 8 /* backspace */ || event.keyCode === 9 /* tab */) {
          event.preventDefault();
        }
      },onKeyup:function(event) {
        GLFW.onKeyChanged(event.keyCode, 0); // GLFW_RELEASE
      },onBlur:function(event) {
        if (!GLFW.active) return;
  
        for (var i = 0; i < GLFW.active.domKeys.length; ++i) {
          if (GLFW.active.domKeys[i]) {
            GLFW.onKeyChanged(i, 0); // GLFW_RELEASE
          }
        }
      },onMousemove:function(event) {
        if (!GLFW.active) return;
  
        Browser.calculateMouseEvent(event);
  
        if (event.target != Module["canvas"] || !GLFW.active.cursorPosFunc) return;
  
        (function(a1, a2) {  dynCall_vii.apply(null, [GLFW.active.cursorPosFunc, a1, a2]); })(Browser.mouseX, Browser.mouseY);
  
      },DOMToGLFWMouseButton:function(event) {
        // DOM and glfw have different button codes.
        // See http://www.w3schools.com/jsref/event_button.asp.
        var eventButton = event['button'];
        if (eventButton > 0) {
          if (eventButton == 1) {
            eventButton = 2;
          } else {
            eventButton = 1;
          }
        }
        return eventButton;
      },onMouseenter:function(event) {
        if (!GLFW.active) return;
  
        if (event.target != Module["canvas"] || !GLFW.active.cursorEnterFunc) return;
  
      },onMouseleave:function(event) {
        if (!GLFW.active) return;
  
        if (event.target != Module["canvas"] || !GLFW.active.cursorEnterFunc) return;
  
      },onMouseButtonChanged:function(event, status) {
        if (!GLFW.active) return;
  
        Browser.calculateMouseEvent(event);
  
        if (event.target != Module["canvas"]) return;
  
        var eventButton = GLFW.DOMToGLFWMouseButton(event);
  
        if (status == 1) { // GLFW_PRESS
          GLFW.active.buttons |= (1 << eventButton);
          try {
            event.target.setCapture();
          } catch (e) {}
        } else {  // GLFW_RELEASE
          GLFW.active.buttons &= ~(1 << eventButton);
        }
  
        if (!GLFW.active.mouseButtonFunc) return;
  
        (function(a1, a2) {  dynCall_vii.apply(null, [GLFW.active.mouseButtonFunc, a1, a2]); })(eventButton, status);
  
      },onMouseButtonDown:function(event) {
        if (!GLFW.active) return;
        GLFW.onMouseButtonChanged(event, 1); // GLFW_PRESS
      },onMouseButtonUp:function(event) {
        if (!GLFW.active) return;
        GLFW.onMouseButtonChanged(event, 0); // GLFW_RELEASE
      },onMouseWheel:function(event) {
        // Note the minus sign that flips browser wheel direction (positive direction scrolls page down) to native wheel direction (positive direction is mouse wheel up)
        var delta = -Browser.getMouseWheelDelta(event);
        delta = (delta == 0) ? 0 : (delta > 0 ? Math.max(delta, 1) : Math.min(delta, -1)); // Quantize to integer so that minimum scroll is at least +/- 1.
        GLFW.wheelPos += delta;
  
        if (!GLFW.active || !GLFW.active.scrollFunc || event.target != Module['canvas']) return;
  
        (function(a1) {  dynCall_vi.apply(null, [GLFW.active.scrollFunc, a1]); })(GLFW.wheelPos);
  
        event.preventDefault();
      },onCanvasResize:function(width, height) {
        if (!GLFW.active) return;
  
        var resizeNeeded = true;
  
        // If the client is requesting fullscreen mode
        if (document["fullscreen"] || document["fullScreen"] || document["mozFullScreen"] || document["webkitIsFullScreen"]) {
          GLFW.active.storedX = GLFW.active.x;
          GLFW.active.storedY = GLFW.active.y;
          GLFW.active.storedWidth = GLFW.active.width;
          GLFW.active.storedHeight = GLFW.active.height;
          GLFW.active.x = GLFW.active.y = 0;
          GLFW.active.width = screen.width;
          GLFW.active.height = screen.height;
          GLFW.active.fullscreen = true;
  
        // If the client is reverting from fullscreen mode
        } else if (GLFW.active.fullscreen == true) {
          GLFW.active.x = GLFW.active.storedX;
          GLFW.active.y = GLFW.active.storedY;
          GLFW.active.width = GLFW.active.storedWidth;
          GLFW.active.height = GLFW.active.storedHeight;
          GLFW.active.fullscreen = false;
  
        // If the width/height values do not match current active window sizes
        } else if (GLFW.active.width != width || GLFW.active.height != height) {
            GLFW.active.width = width;
            GLFW.active.height = height;
        } else {
          resizeNeeded = false;
        }
  
        // If any of the above conditions were true, we need to resize the canvas
        if (resizeNeeded) {
          // resets the canvas size to counter the aspect preservation of Browser.updateCanvasDimensions
          Browser.setCanvasSize(GLFW.active.width, GLFW.active.height, true);
          // TODO: Client dimensions (clientWidth/clientHeight) vs pixel dimensions (width/height) of
          // the canvas should drive window and framebuffer size respectfully.
          GLFW.onWindowSizeChanged();
          GLFW.onFramebufferSizeChanged();
        }
      },onWindowSizeChanged:function() {
        if (!GLFW.active) return;
  
        if (!GLFW.active.windowSizeFunc) return;
  
        (function(a1, a2) {  dynCall_vii.apply(null, [GLFW.active.windowSizeFunc, a1, a2]); })(GLFW.active.width, GLFW.active.height);
  
      },onFramebufferSizeChanged:function() {
        if (!GLFW.active) return;
  
        if (!GLFW.active.framebufferSizeFunc) return;
  
      },getTime:function() {
        return _emscripten_get_now() / 1000;
      },setWindowTitle:function(winid, title) {
        var win = GLFW.WindowFromId(winid);
        if (!win) return;
  
        win.title = UTF8ToString(title);
        if (GLFW.active.id == win.id) {
          document.title = win.title;
        }
      },setJoystickCallback:function(cbfun) {
        GLFW.joystickFunc = cbfun;
        GLFW.refreshJoysticks();
      },joys:{},lastGamepadState:null,lastGamepadStateFrame:null,refreshJoysticks:function() {
        // Produce a new Gamepad API sample if we are ticking a new game frame, or if not using emscripten_set_main_loop() at all to drive animation.
        if (Browser.mainLoop.currentFrameNumber !== GLFW.lastGamepadStateFrame || !Browser.mainLoop.currentFrameNumber) {
          GLFW.lastGamepadState = navigator.getGamepads ? navigator.getGamepads() : (navigator.webkitGetGamepads ? navigator.webkitGetGamepads : null);
          GLFW.lastGamepadStateFrame = Browser.mainLoop.currentFrameNumber;
  
          for (var joy = 0; joy < GLFW.lastGamepadState.length; ++joy) {
            var gamepad = GLFW.lastGamepadState[joy];
  
            if (gamepad) {
              if (!GLFW.joys[joy]) {
                console.log('glfw joystick connected:',joy);
                GLFW.joys[joy] = {
                  id: allocate(intArrayFromString(gamepad.id), ALLOC_NORMAL),
                  buttonsCount: gamepad.buttons.length,
                  axesCount: gamepad.axes.length,
                  buttons: allocate(new Array(gamepad.buttons.length), ALLOC_NORMAL),
                  axes: allocate(new Array(gamepad.axes.length*4), ALLOC_NORMAL)
                };
  
                if (GLFW.joystickFunc) {
                  (function(a1, a2) {  dynCall_vii.apply(null, [GLFW.joystickFunc, a1, a2]); })(joy, 0x00040001); // GLFW_CONNECTED
                }
              }
  
              var data = GLFW.joys[joy];
  
              for (var i = 0; i < gamepad.buttons.length;  ++i) {
                setValue(data.buttons + i, gamepad.buttons[i].pressed, 'i8');
              }
  
              for (var i = 0; i < gamepad.axes.length; ++i) {
                setValue(data.axes + i*4, gamepad.axes[i], 'float');
              }
            } else {
              if (GLFW.joys[joy]) {
                console.log('glfw joystick disconnected',joy);
  
                if (GLFW.joystickFunc) {
                  (function(a1, a2) {  dynCall_vii.apply(null, [GLFW.joystickFunc, a1, a2]); })(joy, 0x00040002); // GLFW_DISCONNECTED
                }
  
                _free(GLFW.joys[joy].id);
                _free(GLFW.joys[joy].buttons);
                _free(GLFW.joys[joy].axes);
  
                delete GLFW.joys[joy];
              }
            }
          }
        }
      },setKeyCallback:function(winid, cbfun) {
        var win = GLFW.WindowFromId(winid);
        if (!win) return null;
        var prevcbfun = win.keyFunc;
        win.keyFunc = cbfun;
        return prevcbfun;
      },setCharCallback:function(winid, cbfun) {
        var win = GLFW.WindowFromId(winid);
        if (!win) return null;
        var prevcbfun = win.charFunc;
        win.charFunc = cbfun;
        return prevcbfun;
      },setMouseButtonCallback:function(winid, cbfun) {
        var win = GLFW.WindowFromId(winid);
        if (!win) return null;
        var prevcbfun = win.mouseButtonFunc;
        win.mouseButtonFunc = cbfun;
        return prevcbfun;
      },setCursorPosCallback:function(winid, cbfun) {
        var win = GLFW.WindowFromId(winid);
        if (!win) return null;
        var prevcbfun = win.cursorPosFunc;
        win.cursorPosFunc = cbfun;
        return prevcbfun;
      },setScrollCallback:function(winid, cbfun) {
        var win = GLFW.WindowFromId(winid);
        if (!win) return null;
        var prevcbfun = win.scrollFunc;
        win.scrollFunc = cbfun;
        return prevcbfun;
      },setDropCallback:function(winid, cbfun) {
        var win = GLFW.WindowFromId(winid);
        if (!win) return null;
        var prevcbfun = win.dropFunc;
        win.dropFunc = cbfun;
        return prevcbfun;
      },onDrop:function(event) {
        if (!GLFW.active || !GLFW.active.dropFunc) return;
        if (!event.dataTransfer || !event.dataTransfer.files || event.dataTransfer.files.length == 0) return;
  
        event.preventDefault();
  
        var filenames = allocate(new Array(event.dataTransfer.files.length*4), ALLOC_NORMAL);
        var filenamesArray = [];
        var count = event.dataTransfer.files.length;
  
        // Read and save the files to emscripten's FS
        var written = 0;
        var drop_dir = '.glfw_dropped_files';
        FS.createPath('/', drop_dir);
  
        function save(file) {
          var path = '/' + drop_dir + '/' + file.name.replace(/\//g, '_');
          var reader = new FileReader();
          reader.onloadend = function(e) {
            if (reader.readyState != 2) { // not DONE
              ++written;
              console.log('failed to read dropped file: '+file.name+': '+reader.error);
              return;
            }
  
            var data = e.target.result;
            FS.writeFile(path, new Uint8Array(data));
            if (++written === count) {
              (function(a1, a2, a3) {  dynCall_viii.apply(null, [GLFW.active.dropFunc, a1, a2, a3]); })(GLFW.active.id, count, filenames);
  
              for (var i = 0; i < filenamesArray.length; ++i) {
                _free(filenamesArray[i]);
              }
              _free(filenames);
            }
          };
          reader.readAsArrayBuffer(file);
  
          var filename = allocate(intArrayFromString(path), ALLOC_NORMAL);
          filenamesArray.push(filename);
          setValue(filenames + i*4, filename, 'i8*');
        }
  
        for (var i = 0; i < count; ++i) {
          save(event.dataTransfer.files[i]);
        }
  
        return false;
      },onDragover:function(event) {
        if (!GLFW.active || !GLFW.active.dropFunc) return;
  
        event.preventDefault();
        return false;
      },setWindowSizeCallback:function(winid, cbfun) {
        var win = GLFW.WindowFromId(winid);
        if (!win) return null;
        var prevcbfun = win.windowSizeFunc;
        win.windowSizeFunc = cbfun;
  
        // As documented in GLFW2 API (http://www.glfw.org/GLFWReference27.pdf#page=22), when size
        // callback function is set, it will be called with the current window size before this
        // function returns.
        // GLFW3 on the over hand doesn't have this behavior (https://github.com/glfw/glfw/issues/62).
        if (!win.windowSizeFunc) return null;
        (function(a1, a2) {  dynCall_vii.apply(null, [win.windowSizeFunc, a1, a2]); })(win.width, win.height);
  
        return prevcbfun;
      },setWindowCloseCallback:function(winid, cbfun) {
        var win = GLFW.WindowFromId(winid);
        if (!win) return null;
        var prevcbfun = win.windowCloseFunc;
        win.windowCloseFunc = cbfun;
        return prevcbfun;
      },setWindowRefreshCallback:function(winid, cbfun) {
        var win = GLFW.WindowFromId(winid);
        if (!win) return null;
        var prevcbfun = win.windowRefreshFunc;
        win.windowRefreshFunc = cbfun;
        return prevcbfun;
      },onClickRequestPointerLock:function(e) {
        if (!Browser.pointerLock && Module['canvas'].requestPointerLock) {
          Module['canvas'].requestPointerLock();
          e.preventDefault();
        }
      },setInputMode:function(winid, mode, value) {
        var win = GLFW.WindowFromId(winid);
        if (!win) return;
  
        switch (mode) {
          case 0x00033001: { // GLFW_CURSOR
            switch (value) {
              case 0x00034001: { // GLFW_CURSOR_NORMAL
                win.inputModes[mode] = value;
                Module['canvas'].removeEventListener('click', GLFW.onClickRequestPointerLock, true);
                Module['canvas'].exitPointerLock();
                break;
              }
              case 0x00034002: { // GLFW_CURSOR_HIDDEN
                console.log("glfwSetInputMode called with GLFW_CURSOR_HIDDEN value not implemented.");
                break;
              }
              case 0x00034003: { // GLFW_CURSOR_DISABLED
                win.inputModes[mode] = value;
                Module['canvas'].addEventListener('click', GLFW.onClickRequestPointerLock, true);
                Module['canvas'].requestPointerLock();
                break;
              }
              default: {
                console.log("glfwSetInputMode called with unknown value parameter value: " + value + ".");
                break;
              }
            }
            break;
          }
          case 0x00033002: { // GLFW_STICKY_KEYS
            console.log("glfwSetInputMode called with GLFW_STICKY_KEYS mode not implemented.");
            break;
          }
          case 0x00033003: { // GLFW_STICKY_MOUSE_BUTTONS
            console.log("glfwSetInputMode called with GLFW_STICKY_MOUSE_BUTTONS mode not implemented.");
            break;
          }
          default: {
            console.log("glfwSetInputMode called with unknown mode parameter value: " + mode + ".");
            break;
          }
        }
      },getKey:function(winid, key) {
        var win = GLFW.WindowFromId(winid);
        if (!win) return 0;
        return win.keys[key];
      },getMouseButton:function(winid, button) {
        var win = GLFW.WindowFromId(winid);
        if (!win) return 0;
        return (win.buttons & (1 << button)) > 0;
      },getCursorPos:function(winid, x, y) {
        setValue(x, Browser.mouseX, 'double');
        setValue(y, Browser.mouseY, 'double');
      },getMousePos:function(winid, x, y) {
        setValue(x, Browser.mouseX, 'i32');
        setValue(y, Browser.mouseY, 'i32');
      },setCursorPos:function(winid, x, y) {
      },getWindowPos:function(winid, x, y) {
        var wx = 0;
        var wy = 0;
  
        var win = GLFW.WindowFromId(winid);
        if (win) {
          wx = win.x;
          wy = win.y;
        }
  
        if (x) {
          setValue(x, wx, 'i32');
        }
  
        if (y) {
          setValue(y, wy, 'i32');
        }
      },setWindowPos:function(winid, x, y) {
        var win = GLFW.WindowFromId(winid);
        if (!win) return;
        win.x = x;
        win.y = y;
      },getWindowSize:function(winid, width, height) {
        var ww = 0;
        var wh = 0;
  
        var win = GLFW.WindowFromId(winid);
        if (win) {
          ww = win.width;
          wh = win.height;
        }
  
        if (width) {
          setValue(width, ww, 'i32');
        }
  
        if (height) {
          setValue(height, wh, 'i32');
        }
      },setWindowSize:function(winid, width, height) {
        var win = GLFW.WindowFromId(winid);
        if (!win) return;
  
        if (GLFW.active.id == win.id) {
          if (width == screen.width && height == screen.height) {
            Browser.requestFullscreen();
          } else {
            Browser.exitFullscreen();
            Browser.setCanvasSize(width, height);
            win.width = width;
            win.height = height;
          }
        }
  
        if (!win.windowSizeFunc) return;
  
        (function(a1, a2) {  dynCall_vii.apply(null, [win.windowSizeFunc, a1, a2]); })(width, height);
  
      },createWindow:function(width, height, title, monitor, share) {
        var i, id;
        for (i = 0; i < GLFW.windows.length && GLFW.windows[i] !== null; i++) {
          // no-op
        }
        if (i > 0) throw "glfwCreateWindow only supports one window at time currently";
  
        // id for window
        id = i + 1;
  
        // not valid
        if (width <= 0 || height <= 0) return 0;
  
        if (monitor) {
          Browser.requestFullscreen();
        } else {
          Browser.setCanvasSize(width, height);
        }
  
        // Create context when there are no existing alive windows
        for (i = 0; i < GLFW.windows.length && GLFW.windows[i] == null; i++) {
          // no-op
        }
        var useWebGL = GLFW.hints[0x00022001] > 0; // Use WebGL when we are told to based on GLFW_CLIENT_API
        if (i == GLFW.windows.length) {
          if (useWebGL) {
            var contextAttributes = {
              antialias: (GLFW.hints[0x0002100D] > 1), // GLFW_SAMPLES
              depth: (GLFW.hints[0x00021005] > 0),     // GLFW_DEPTH_BITS
              stencil: (GLFW.hints[0x00021006] > 0),   // GLFW_STENCIL_BITS
              alpha: (GLFW.hints[0x00021004] > 0)      // GLFW_ALPHA_BITS
            }
            Module.ctx = Browser.createContext(Module['canvas'], true, true, contextAttributes);
          } else {
            Browser.init();
          }
        }
  
        // If context creation failed, do not return a valid window
        if (!Module.ctx && useWebGL) return 0;
  
        // Get non alive id
        var win = new GLFW_Window(id, width, height, title, monitor, share);
  
        // Set window to array
        if (id - 1 == GLFW.windows.length) {
          GLFW.windows.push(win);
        } else {
          GLFW.windows[id - 1] = win;
        }
  
        GLFW.active = win;
        return win.id;
      },destroyWindow:function(winid) {
        var win = GLFW.WindowFromId(winid);
        if (!win) return;
  
        GLFW.windows[win.id - 1] = null;
        if (GLFW.active.id == win.id)
          GLFW.active = null;
  
        // Destroy context when no alive windows
        for (var i = 0; i < GLFW.windows.length; i++)
          if (GLFW.windows[i] !== null) return;
  
        Module.ctx = Browser.destroyContext(Module['canvas'], true, true);
      },swapBuffers:function(winid) {
      },GLFW2ParamToGLFW3Param:function(param) {
        var table = {
          0x00030001:0, // GLFW_MOUSE_CURSOR
          0x00030002:0, // GLFW_STICKY_KEYS
          0x00030003:0, // GLFW_STICKY_MOUSE_BUTTONS
          0x00030004:0, // GLFW_SYSTEM_KEYS
          0x00030005:0, // GLFW_KEY_REPEAT
          0x00030006:0, // GLFW_AUTO_POLL_EVENTS
          0x00020001:0, // GLFW_OPENED
          0x00020002:0, // GLFW_ACTIVE
          0x00020003:0, // GLFW_ICONIFIED
          0x00020004:0, // GLFW_ACCELERATED
          0x00020005:0x00021001, // GLFW_RED_BITS
          0x00020006:0x00021002, // GLFW_GREEN_BITS
          0x00020007:0x00021003, // GLFW_BLUE_BITS
          0x00020008:0x00021004, // GLFW_ALPHA_BITS
          0x00020009:0x00021005, // GLFW_DEPTH_BITS
          0x0002000A:0x00021006, // GLFW_STENCIL_BITS
          0x0002000B:0x0002100F, // GLFW_REFRESH_RATE
          0x0002000C:0x00021007, // GLFW_ACCUM_RED_BITS
          0x0002000D:0x00021008, // GLFW_ACCUM_GREEN_BITS
          0x0002000E:0x00021009, // GLFW_ACCUM_BLUE_BITS
          0x0002000F:0x0002100A, // GLFW_ACCUM_ALPHA_BITS
          0x00020010:0x0002100B, // GLFW_AUX_BUFFERS
          0x00020011:0x0002100C, // GLFW_STEREO
          0x00020012:0, // GLFW_WINDOW_NO_RESIZE
          0x00020013:0x0002100D, // GLFW_FSAA_SAMPLES
          0x00020014:0x00022002, // GLFW_OPENGL_VERSION_MAJOR
          0x00020015:0x00022003, // GLFW_OPENGL_VERSION_MINOR
          0x00020016:0x00022006, // GLFW_OPENGL_FORWARD_COMPAT
          0x00020017:0x00022007, // GLFW_OPENGL_DEBUG_CONTEXT
          0x00020018:0x00022008, // GLFW_OPENGL_PROFILE
        };
        return table[param];
      }};
  function _glfwInit() {
      if (GLFW.windows) return 1; // GL_TRUE
  
      GLFW.initialTime = GLFW.getTime();
      GLFW.hints = GLFW.defaultHints;
      GLFW.windows = new Array()
      GLFW.active = null;
  
      window.addEventListener("gamepadconnected", GLFW.onGamepadConnected, true);
      window.addEventListener("gamepaddisconnected", GLFW.onGamepadDisconnected, true);
      window.addEventListener("keydown", GLFW.onKeydown, true);
      window.addEventListener("keypress", GLFW.onKeyPress, true);
      window.addEventListener("keyup", GLFW.onKeyup, true);
      window.addEventListener("blur", GLFW.onBlur, true);
      Module["canvas"].addEventListener("touchmove", GLFW.onMousemove, true);
      Module["canvas"].addEventListener("touchstart", GLFW.onMouseButtonDown, true);
      Module["canvas"].addEventListener("touchcancel", GLFW.onMouseButtonUp, true);
      Module["canvas"].addEventListener("touchend", GLFW.onMouseButtonUp, true);
      Module["canvas"].addEventListener("mousemove", GLFW.onMousemove, true);
      Module["canvas"].addEventListener("mousedown", GLFW.onMouseButtonDown, true);
      Module["canvas"].addEventListener("mouseup", GLFW.onMouseButtonUp, true);
      Module["canvas"].addEventListener('wheel', GLFW.onMouseWheel, true);
      Module["canvas"].addEventListener('mousewheel', GLFW.onMouseWheel, true);
      Module["canvas"].addEventListener('mouseenter', GLFW.onMouseenter, true);
      Module["canvas"].addEventListener('mouseleave', GLFW.onMouseleave, true);
      Module["canvas"].addEventListener('drop', GLFW.onDrop, true);
      Module["canvas"].addEventListener('dragover', GLFW.onDragover, true);
  
      Browser.resizeListeners.push(function(width, height) {
         GLFW.onCanvasResize(width, height);
      });
      return 1; // GL_TRUE
    }

  function _glfwOpenWindow(width, height, redbits, greenbits, bluebits, alphabits, depthbits, stencilbits, mode) {
      GLFW.hints[0x00021001] = redbits;     // GLFW_RED_BITS
      GLFW.hints[0x00021002] = greenbits;   // GLFW_GREEN_BITS
      GLFW.hints[0x00021003] = bluebits;    // GLFW_BLUE_BITS
      GLFW.hints[0x00021004] = alphabits;   // GLFW_ALPHA_BITS
      GLFW.hints[0x00021005] = depthbits;   // GLFW_DEPTH_BITS
      GLFW.hints[0x00021006] = stencilbits; // GLFW_STENCIL_BITS
      GLFW.createWindow(width, height, "GLFW2 Window", 0, 0);
      return 1; // GL_TRUE
    }

  function _glfwSetWindowSize(width, height) {
      GLFW.setWindowSize(GLFW.active.id, width, height);
    }

  function _gluPerspective(fov, aspect, near, far) {
      GLImmediate.matricesModified = true;
      GLImmediate.matrixVersion[GLImmediate.currentMatrix] = (GLImmediate.matrixVersion[GLImmediate.currentMatrix] + 1)|0;
      GLImmediate.matrix[GLImmediate.currentMatrix] =
        GLImmediate.matrixLib.mat4.perspective(fov, aspect, near, far,
                                                 GLImmediate.matrix[GLImmediate.currentMatrix]);
    }

  function _setTempRet0(val) {
      setTempRet0(val);
    }

  function runAndAbortIfError(func) {
      try {
        return func();
      } catch (e) {
        abort(e);
      }
    }
  var Asyncify={State:{Normal:0,Unwinding:1,Rewinding:2},state:0,StackSize:4096,currData:null,handleSleepReturnValue:0,exportCallStack:[],callStackNameToId:{},callStackIdToName:{},callStackId:0,afterUnwind:null,asyncFinalizers:[],sleepCallbacks:[],getCallStackId:function(funcName) {
        var id = Asyncify.callStackNameToId[funcName];
        if (id === undefined) {
          id = Asyncify.callStackId++;
          Asyncify.callStackNameToId[funcName] = id;
          Asyncify.callStackIdToName[id] = funcName;
        }
        return id;
      },instrumentWasmImports:function(imports) {
        var ASYNCIFY_IMPORTS = ["env.invoke_*","env.emscripten_sleep","env.emscripten_wget","env.emscripten_wget_data","env.emscripten_idb_load","env.emscripten_idb_store","env.emscripten_idb_delete","env.emscripten_idb_exists","env.emscripten_idb_load_blob","env.emscripten_idb_store_blob","env.SDL_Delay","env.emscripten_scan_registers","env.emscripten_lazy_load_code","env.emscripten_fiber_swap","wasi_snapshot_preview1.fd_sync","env.__wasi_fd_sync","env._emval_await"].map(function(x) {
          return x.split('.')[1];
        });
        for (var x in imports) {
          (function(x) {
            var original = imports[x];
            if (typeof original === 'function') {
              imports[x] = function() {
                var originalAsyncifyState = Asyncify.state;
                try {
                  return original.apply(null, arguments);
                } finally {
                  // Only functions in the list of known relevant imports are allowed to change the state.
                  // Note that invoke_* functions are allowed to change the state if we do not ignore
                  // indirect calls.
                  if (Asyncify.state !== originalAsyncifyState &&
                      ASYNCIFY_IMPORTS.indexOf(x) < 0 &&
                      !(x.startsWith('invoke_') && true)) {
                    throw 'import ' + x + ' was not in ASYNCIFY_IMPORTS, but changed the state';
                  }
                }
              }
            }
          })(x);
        }
      },checkStateAfterExitRuntime:function() {
        assert(Asyncify.state === Asyncify.State.None,
              'Asyncify cannot be done during or after the runtime exits');
      },instrumentWasmExports:function(exports) {
        var ret = {};
        for (var x in exports) {
          (function(x) {
            var original = exports[x];
            if (typeof original === 'function') {
              ret[x] = function() {
                Asyncify.exportCallStack.push(x);
                try {
                  return original.apply(null, arguments);
                } finally {
                  if (ABORT) return;
                  var y = Asyncify.exportCallStack.pop();
                  assert(y === x);
                  Asyncify.maybeStopUnwind();
                }
              };
            } else {
              ret[x] = original;
            }
          })(x);
        }
        return ret;
      },maybeStopUnwind:function() {
        if (Asyncify.currData &&
            Asyncify.state === Asyncify.State.Unwinding &&
            Asyncify.exportCallStack.length === 0) {
          // We just finished unwinding.
          Asyncify.state = Asyncify.State.Normal;
          runAndAbortIfError(Module['_asyncify_stop_unwind']);
          if (typeof Fibers !== 'undefined') {
            Fibers.trampoline();
          }
          if (Asyncify.afterUnwind) {
            Asyncify.afterUnwind();
            Asyncify.afterUnwind = null;
          }
        }
      },allocateData:function() {
        // An asyncify data structure has three fields:
        //  0  current stack pos
        //  4  max stack pos
        //  8  id of function at bottom of the call stack (callStackIdToName[id] == name of js function)
        //
        // The Asyncify ABI only interprets the first two fields, the rest is for the runtime.
        // We also embed a stack in the same memory region here, right next to the structure.
        // This struct is also defined as asyncify_data_t in emscripten/fiber.h
        var ptr = _malloc(12 + Asyncify.StackSize);
        Asyncify.setDataHeader(ptr, ptr + 12, Asyncify.StackSize);
        Asyncify.setDataRewindFunc(ptr);
        return ptr;
      },setDataHeader:function(ptr, stack, stackSize) {
        HEAP32[((ptr)>>2)] = stack;
        HEAP32[(((ptr)+(4))>>2)] = stack + stackSize;
      },setDataRewindFunc:function(ptr) {
        var bottomOfCallStack = Asyncify.exportCallStack[0];
        var rewindId = Asyncify.getCallStackId(bottomOfCallStack);
        HEAP32[(((ptr)+(8))>>2)] = rewindId;
      },getDataRewindFunc:function(ptr) {
        var id = HEAP32[(((ptr)+(8))>>2)];
        var name = Asyncify.callStackIdToName[id];
        var func = Module['asm'][name];
        return func;
      },handleSleep:function(startAsync) {
        if (ABORT) return;
        noExitRuntime = true;
        if (Asyncify.state === Asyncify.State.Normal) {
          // Prepare to sleep. Call startAsync, and see what happens:
          // if the code decided to call our callback synchronously,
          // then no async operation was in fact begun, and we don't
          // need to do anything.
          var reachedCallback = false;
          var reachedAfterCallback = false;
          startAsync(function(handleSleepReturnValue) {
            assert(!handleSleepReturnValue || typeof handleSleepReturnValue === 'number' || typeof handleSleepReturnValue === 'boolean'); // old emterpretify API supported other stuff
            if (ABORT) return;
            Asyncify.handleSleepReturnValue = handleSleepReturnValue || 0;
            reachedCallback = true;
            if (!reachedAfterCallback) {
              // We are happening synchronously, so no need for async.
              return;
            }
            // This async operation did not happen synchronously, so we did
            // unwind. In that case there can be no compiled code on the stack,
            // as it might break later operations (we can rewind ok now, but if
            // we unwind again, we would unwind through the extra compiled code
            // too).
            assert(!Asyncify.exportCallStack.length, 'Waking up (starting to rewind) must be done from JS, without compiled code on the stack.');
            Asyncify.state = Asyncify.State.Rewinding;
            runAndAbortIfError(function() { Module['_asyncify_start_rewind'](Asyncify.currData) });
            if (typeof Browser !== 'undefined' && Browser.mainLoop.func) {
              Browser.mainLoop.resume();
            }
            var start = Asyncify.getDataRewindFunc(Asyncify.currData);
            var asyncWasmReturnValue = start();
            if (!Asyncify.currData) {
              // All asynchronous execution has finished.
              // `asyncWasmReturnValue` now contains the final
              // return value of the exported async WASM function.
              //
              // Note: `asyncWasmReturnValue` is distinct from
              // `Asyncify.handleSleepReturnValue`.
              // `Asyncify.handleSleepReturnValue` contains the return
              // value of the last C function to have executed
              // `Asyncify.handleSleep()`, where as `asyncWasmReturnValue`
              // contains the return value of the exported WASM function
              // that may have called C functions that
              // call `Asyncify.handleSleep()`.
              var asyncFinalizers = Asyncify.asyncFinalizers;
              Asyncify.asyncFinalizers = [];
              asyncFinalizers.forEach(function(func) {
                func(asyncWasmReturnValue);
              });
            }
          });
          reachedAfterCallback = true;
          if (!reachedCallback) {
            // A true async operation was begun; start a sleep.
            Asyncify.state = Asyncify.State.Unwinding;
            // TODO: reuse, don't alloc/free every sleep
            Asyncify.currData = Asyncify.allocateData();
            runAndAbortIfError(function() { Module['_asyncify_start_unwind'](Asyncify.currData) });
            if (typeof Browser !== 'undefined' && Browser.mainLoop.func) {
              Browser.mainLoop.pause();
            }
          }
        } else if (Asyncify.state === Asyncify.State.Rewinding) {
          // Stop a resume.
          Asyncify.state = Asyncify.State.Normal;
          runAndAbortIfError(Module['_asyncify_stop_rewind']);
          _free(Asyncify.currData);
          Asyncify.currData = null;
          // Call all sleep callbacks now that the sleep-resume is all done.
          Asyncify.sleepCallbacks.forEach(function(func) {
            func();
          });
        } else {
          abort('invalid state: ' + Asyncify.state);
        }
        return Asyncify.handleSleepReturnValue;
      },handleAsync:function(startAsync) {
        return Asyncify.handleSleep(function(wakeUp) {
          // TODO: add error handling as a second param when handleSleep implements it.
          startAsync().then(wakeUp);
        });
      }};

var FSNode = /** @constructor */ function(parent, name, mode, rdev) {
    if (!parent) {
      parent = this;  // root node sets parent to itself
    }
    this.parent = parent;
    this.mount = parent.mount;
    this.mounted = null;
    this.id = FS.nextInode++;
    this.name = name;
    this.mode = mode;
    this.node_ops = {};
    this.stream_ops = {};
    this.rdev = rdev;
  };
  var readMode = 292/*292*/ | 73/*73*/;
  var writeMode = 146/*146*/;
  Object.defineProperties(FSNode.prototype, {
   read: {
    get: /** @this{FSNode} */function() {
     return (this.mode & readMode) === readMode;
    },
    set: /** @this{FSNode} */function(val) {
     val ? this.mode |= readMode : this.mode &= ~readMode;
    }
   },
   write: {
    get: /** @this{FSNode} */function() {
     return (this.mode & writeMode) === writeMode;
    },
    set: /** @this{FSNode} */function(val) {
     val ? this.mode |= writeMode : this.mode &= ~writeMode;
    }
   },
   isFolder: {
    get: /** @this{FSNode} */function() {
     return FS.isDir(this.mode);
    }
   },
   isDevice: {
    get: /** @this{FSNode} */function() {
     return FS.isChrdev(this.mode);
    }
   }
  });
  FS.FSNode = FSNode;
  FS.staticInit();;
Module["requestFullscreen"] = function Module_requestFullscreen(lockPointer, resizeCanvas) { Browser.requestFullscreen(lockPointer, resizeCanvas) };
  Module["requestFullScreen"] = function Module_requestFullScreen() { Browser.requestFullScreen() };
  Module["requestAnimationFrame"] = function Module_requestAnimationFrame(func) { Browser.requestAnimationFrame(func) };
  Module["setCanvasSize"] = function Module_setCanvasSize(width, height, noUpdates) { Browser.setCanvasSize(width, height, noUpdates) };
  Module["pauseMainLoop"] = function Module_pauseMainLoop() { Browser.mainLoop.pause() };
  Module["resumeMainLoop"] = function Module_resumeMainLoop() { Browser.mainLoop.resume() };
  Module["getUserMedia"] = function Module_getUserMedia() { Browser.getUserMedia() }
  Module["createContext"] = function Module_createContext(canvas, useWebGL, setInModule, webGLContextAttributes) { return Browser.createContext(canvas, useWebGL, setInModule, webGLContextAttributes) };
GLImmediate.setupFuncs(); Browser.moduleContextCreatedCallbacks.push(function() { GLImmediate.init() });;
var GLctx;;
GLEmulation.init();;
var ASSERTIONS = true;



/** @type {function(string, boolean=, number=)} */
function intArrayFromString(stringy, dontAddNull, length) {
  var len = length > 0 ? length : lengthBytesUTF8(stringy)+1;
  var u8array = new Array(len);
  var numBytesWritten = stringToUTF8Array(stringy, u8array, 0, u8array.length);
  if (dontAddNull) u8array.length = numBytesWritten;
  return u8array;
}

function intArrayToString(array) {
  var ret = [];
  for (var i = 0; i < array.length; i++) {
    var chr = array[i];
    if (chr > 0xFF) {
      if (ASSERTIONS) {
        assert(false, 'Character code ' + chr + ' (' + String.fromCharCode(chr) + ')  at offset ' + i + ' not in 0x00-0xFF.');
      }
      chr &= 0xFF;
    }
    ret.push(String.fromCharCode(chr));
  }
  return ret.join('');
}


var asmLibraryArg = {
  "__asctime": ___asctime,
  "__assert_fail": ___assert_fail,
  "__cxa_allocate_exception": ___cxa_allocate_exception,
  "__cxa_atexit": ___cxa_atexit,
  "__cxa_throw": ___cxa_throw,
  "__localtime_r": ___localtime_r,
  "__sys_fcntl64": ___sys_fcntl64,
  "__sys_ioctl": ___sys_ioctl,
  "__sys_open": ___sys_open,
  "abort": _abort,
  "clock_gettime": _clock_gettime,
  "emscripten_asm_const_int": _emscripten_asm_const_int,
  "emscripten_get_now": _emscripten_get_now,
  "emscripten_memcpy_big": _emscripten_memcpy_big,
  "emscripten_resize_heap": _emscripten_resize_heap,
  "emscripten_set_main_loop": _emscripten_set_main_loop,
  "emscripten_wget": _emscripten_wget,
  "fd_close": _fd_close,
  "fd_read": _fd_read,
  "fd_seek": _fd_seek,
  "fd_write": _fd_write,
  "glAlphaFunc": _glAlphaFunc,
  "glBegin": _glBegin,
  "glBindTexture": _glBindTexture,
  "glBlendFunc": _glBlendFunc,
  "glClear": _glClear,
  "glClearColor": _glClearColor,
  "glColor3f": _glColor3f,
  "glColor4f": _glColor4f,
  "glColorPointer": _glColorPointer,
  "glCullFace": _glCullFace,
  "glDeleteTextures": _glDeleteTextures,
  "glDepthFunc": _glDepthFunc,
  "glDepthMask": _glDepthMask,
  "glDisable": _glDisable,
  "glDisableClientState": _glDisableClientState,
  "glDrawArrays": _glDrawArrays,
  "glEnable": _glEnable,
  "glEnableClientState": _glEnableClientState,
  "glEnd": _glEnd,
  "glGenTextures": _glGenTextures,
  "glGetFloatv": _glGetFloatv,
  "glLoadIdentity": _glLoadIdentity,
  "glLoadMatrixf": _glLoadMatrixf,
  "glMatrixMode": _glMatrixMode,
  "glPolygonMode": _glPolygonMode,
  "glPopMatrix": _glPopMatrix,
  "glPushMatrix": _glPushMatrix,
  "glRotatef": _glRotatef,
  "glScalef": _glScalef,
  "glTexCoordPointer": _glTexCoordPointer,
  "glTexImage2D": _glTexImage2D,
  "glTexParameteri": _glTexParameteri,
  "glTranslatef": _glTranslatef,
  "glVertex3f": _glVertex3f,
  "glVertex3fv": _glVertex3fv,
  "glVertexPointer": _glVertexPointer,
  "glViewport": _glViewport,
  "glfwInit": _glfwInit,
  "glfwOpenWindow": _glfwOpenWindow,
  "glfwSetWindowSize": _glfwSetWindowSize,
  "gluPerspective": _gluPerspective,
  "setTempRet0": _setTempRet0
};
Asyncify.instrumentWasmImports(asmLibraryArg);
var asm = createWasm();
/** @type {function(...*):?} */
var ___wasm_call_ctors = Module["___wasm_call_ctors"] = createExportWrapper("__wasm_call_ctors");

/** @type {function(...*):?} */
var _malloc = Module["_malloc"] = createExportWrapper("malloc");

/** @type {function(...*):?} */
var _free = Module["_free"] = createExportWrapper("free");

/** @type {function(...*):?} */
var _load_new_model = Module["_load_new_model"] = createExportWrapper("load_new_model");

/** @type {function(...*):?} */
var _set_animation = Module["_set_animation"] = createExportWrapper("set_animation");

/** @type {function(...*):?} */
var _set_body = Module["_set_body"] = createExportWrapper("set_body");

/** @type {function(...*):?} */
var _pause = Module["_pause"] = createExportWrapper("pause");

/** @type {function(...*):?} */
var _set_wireframe = Module["_set_wireframe"] = createExportWrapper("set_wireframe");

/** @type {function(...*):?} */
var _reset_zoom = Module["_reset_zoom"] = createExportWrapper("reset_zoom");

/** @type {function(...*):?} */
var _unload_model = Module["_unload_model"] = createExportWrapper("unload_model");

/** @type {function(...*):?} */
var _update_viewport = Module["_update_viewport"] = createExportWrapper("update_viewport");

/** @type {function(...*):?} */
var _main = Module["_main"] = createExportWrapper("main");

/** @type {function(...*):?} */
var ___errno_location = Module["___errno_location"] = createExportWrapper("__errno_location");

/** @type {function(...*):?} */
var _fflush = Module["_fflush"] = createExportWrapper("fflush");

/** @type {function(...*):?} */
var __get_tzname = Module["__get_tzname"] = createExportWrapper("_get_tzname");

/** @type {function(...*):?} */
var __get_daylight = Module["__get_daylight"] = createExportWrapper("_get_daylight");

/** @type {function(...*):?} */
var __get_timezone = Module["__get_timezone"] = createExportWrapper("_get_timezone");

/** @type {function(...*):?} */
var stackSave = Module["stackSave"] = createExportWrapper("stackSave");

/** @type {function(...*):?} */
var stackRestore = Module["stackRestore"] = createExportWrapper("stackRestore");

/** @type {function(...*):?} */
var stackAlloc = Module["stackAlloc"] = createExportWrapper("stackAlloc");

/** @type {function(...*):?} */
var _emscripten_stack_init = Module["_emscripten_stack_init"] = function() {
  return (_emscripten_stack_init = Module["_emscripten_stack_init"] = Module["asm"]["emscripten_stack_init"]).apply(null, arguments);
};

/** @type {function(...*):?} */
var _emscripten_stack_set_limits = Module["_emscripten_stack_set_limits"] = function() {
  return (_emscripten_stack_set_limits = Module["_emscripten_stack_set_limits"] = Module["asm"]["emscripten_stack_set_limits"]).apply(null, arguments);
};

/** @type {function(...*):?} */
var _emscripten_stack_get_free = Module["_emscripten_stack_get_free"] = function() {
  return (_emscripten_stack_get_free = Module["_emscripten_stack_get_free"] = Module["asm"]["emscripten_stack_get_free"]).apply(null, arguments);
};

/** @type {function(...*):?} */
var _emscripten_stack_get_base = Module["_emscripten_stack_get_base"] = function() {
  return (_emscripten_stack_get_base = Module["_emscripten_stack_get_base"] = Module["asm"]["emscripten_stack_get_base"]).apply(null, arguments);
};

/** @type {function(...*):?} */
var _emscripten_stack_get_end = Module["_emscripten_stack_get_end"] = function() {
  return (_emscripten_stack_get_end = Module["_emscripten_stack_get_end"] = Module["asm"]["emscripten_stack_get_end"]).apply(null, arguments);
};

/** @type {function(...*):?} */
var dynCall_ii = Module["dynCall_ii"] = createExportWrapper("dynCall_ii");

/** @type {function(...*):?} */
var dynCall_vi = Module["dynCall_vi"] = createExportWrapper("dynCall_vi");

/** @type {function(...*):?} */
var dynCall_v = Module["dynCall_v"] = createExportWrapper("dynCall_v");

/** @type {function(...*):?} */
var dynCall_viif = Module["dynCall_viif"] = createExportWrapper("dynCall_viif");

/** @type {function(...*):?} */
var dynCall_i = Module["dynCall_i"] = createExportWrapper("dynCall_i");

/** @type {function(...*):?} */
var dynCall_iii = Module["dynCall_iii"] = createExportWrapper("dynCall_iii");

/** @type {function(...*):?} */
var dynCall_fi = Module["dynCall_fi"] = createExportWrapper("dynCall_fi");

/** @type {function(...*):?} */
var dynCall_vii = Module["dynCall_vii"] = createExportWrapper("dynCall_vii");

/** @type {function(...*):?} */
var dynCall_iiii = Module["dynCall_iiii"] = createExportWrapper("dynCall_iiii");

/** @type {function(...*):?} */
var dynCall_vif = Module["dynCall_vif"] = createExportWrapper("dynCall_vif");

/** @type {function(...*):?} */
var dynCall_viii = Module["dynCall_viii"] = createExportWrapper("dynCall_viii");

/** @type {function(...*):?} */
var dynCall_jiji = Module["dynCall_jiji"] = createExportWrapper("dynCall_jiji");

/** @type {function(...*):?} */
var dynCall_iidiiii = Module["dynCall_iidiiii"] = createExportWrapper("dynCall_iidiiii");

/** @type {function(...*):?} */
var dynCall_viiiiii = Module["dynCall_viiiiii"] = createExportWrapper("dynCall_viiiiii");

/** @type {function(...*):?} */
var dynCall_viiiii = Module["dynCall_viiiii"] = createExportWrapper("dynCall_viiiii");

/** @type {function(...*):?} */
var dynCall_viiii = Module["dynCall_viiii"] = createExportWrapper("dynCall_viiii");

/** @type {function(...*):?} */
var _asyncify_start_unwind = Module["_asyncify_start_unwind"] = createExportWrapper("asyncify_start_unwind");

/** @type {function(...*):?} */
var _asyncify_stop_unwind = Module["_asyncify_stop_unwind"] = createExportWrapper("asyncify_stop_unwind");

/** @type {function(...*):?} */
var _asyncify_start_rewind = Module["_asyncify_start_rewind"] = createExportWrapper("asyncify_start_rewind");

/** @type {function(...*):?} */
var _asyncify_stop_rewind = Module["_asyncify_stop_rewind"] = createExportWrapper("asyncify_stop_rewind");





// === Auto-generated postamble setup entry stuff ===

if (!Object.getOwnPropertyDescriptor(Module, "intArrayFromString")) Module["intArrayFromString"] = function() { abort("'intArrayFromString' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "intArrayToString")) Module["intArrayToString"] = function() { abort("'intArrayToString' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
Module["ccall"] = ccall;
if (!Object.getOwnPropertyDescriptor(Module, "cwrap")) Module["cwrap"] = function() { abort("'cwrap' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "setValue")) Module["setValue"] = function() { abort("'setValue' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "getValue")) Module["getValue"] = function() { abort("'getValue' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "allocate")) Module["allocate"] = function() { abort("'allocate' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "UTF8ArrayToString")) Module["UTF8ArrayToString"] = function() { abort("'UTF8ArrayToString' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "UTF8ToString")) Module["UTF8ToString"] = function() { abort("'UTF8ToString' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "stringToUTF8Array")) Module["stringToUTF8Array"] = function() { abort("'stringToUTF8Array' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "stringToUTF8")) Module["stringToUTF8"] = function() { abort("'stringToUTF8' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "lengthBytesUTF8")) Module["lengthBytesUTF8"] = function() { abort("'lengthBytesUTF8' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "stackTrace")) Module["stackTrace"] = function() { abort("'stackTrace' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "addOnPreRun")) Module["addOnPreRun"] = function() { abort("'addOnPreRun' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "addOnInit")) Module["addOnInit"] = function() { abort("'addOnInit' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "addOnPreMain")) Module["addOnPreMain"] = function() { abort("'addOnPreMain' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "addOnExit")) Module["addOnExit"] = function() { abort("'addOnExit' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "addOnPostRun")) Module["addOnPostRun"] = function() { abort("'addOnPostRun' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "writeStringToMemory")) Module["writeStringToMemory"] = function() { abort("'writeStringToMemory' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "writeArrayToMemory")) Module["writeArrayToMemory"] = function() { abort("'writeArrayToMemory' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "writeAsciiToMemory")) Module["writeAsciiToMemory"] = function() { abort("'writeAsciiToMemory' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "addRunDependency")) Module["addRunDependency"] = function() { abort("'addRunDependency' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ). Alternatively, forcing filesystem support (-s FORCE_FILESYSTEM=1) can export this for you") };
if (!Object.getOwnPropertyDescriptor(Module, "removeRunDependency")) Module["removeRunDependency"] = function() { abort("'removeRunDependency' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ). Alternatively, forcing filesystem support (-s FORCE_FILESYSTEM=1) can export this for you") };
if (!Object.getOwnPropertyDescriptor(Module, "FS_createFolder")) Module["FS_createFolder"] = function() { abort("'FS_createFolder' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "FS_createPath")) Module["FS_createPath"] = function() { abort("'FS_createPath' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ). Alternatively, forcing filesystem support (-s FORCE_FILESYSTEM=1) can export this for you") };
if (!Object.getOwnPropertyDescriptor(Module, "FS_createDataFile")) Module["FS_createDataFile"] = function() { abort("'FS_createDataFile' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ). Alternatively, forcing filesystem support (-s FORCE_FILESYSTEM=1) can export this for you") };
if (!Object.getOwnPropertyDescriptor(Module, "FS_createPreloadedFile")) Module["FS_createPreloadedFile"] = function() { abort("'FS_createPreloadedFile' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ). Alternatively, forcing filesystem support (-s FORCE_FILESYSTEM=1) can export this for you") };
if (!Object.getOwnPropertyDescriptor(Module, "FS_createLazyFile")) Module["FS_createLazyFile"] = function() { abort("'FS_createLazyFile' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ). Alternatively, forcing filesystem support (-s FORCE_FILESYSTEM=1) can export this for you") };
if (!Object.getOwnPropertyDescriptor(Module, "FS_createLink")) Module["FS_createLink"] = function() { abort("'FS_createLink' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "FS_createDevice")) Module["FS_createDevice"] = function() { abort("'FS_createDevice' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ). Alternatively, forcing filesystem support (-s FORCE_FILESYSTEM=1) can export this for you") };
if (!Object.getOwnPropertyDescriptor(Module, "FS_unlink")) Module["FS_unlink"] = function() { abort("'FS_unlink' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ). Alternatively, forcing filesystem support (-s FORCE_FILESYSTEM=1) can export this for you") };
if (!Object.getOwnPropertyDescriptor(Module, "getLEB")) Module["getLEB"] = function() { abort("'getLEB' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "getFunctionTables")) Module["getFunctionTables"] = function() { abort("'getFunctionTables' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "alignFunctionTables")) Module["alignFunctionTables"] = function() { abort("'alignFunctionTables' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "registerFunctions")) Module["registerFunctions"] = function() { abort("'registerFunctions' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "addFunction")) Module["addFunction"] = function() { abort("'addFunction' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "removeFunction")) Module["removeFunction"] = function() { abort("'removeFunction' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "getFuncWrapper")) Module["getFuncWrapper"] = function() { abort("'getFuncWrapper' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "prettyPrint")) Module["prettyPrint"] = function() { abort("'prettyPrint' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "dynCall")) Module["dynCall"] = function() { abort("'dynCall' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "getCompilerSetting")) Module["getCompilerSetting"] = function() { abort("'getCompilerSetting' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "print")) Module["print"] = function() { abort("'print' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "printErr")) Module["printErr"] = function() { abort("'printErr' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "getTempRet0")) Module["getTempRet0"] = function() { abort("'getTempRet0' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "setTempRet0")) Module["setTempRet0"] = function() { abort("'setTempRet0' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "callMain")) Module["callMain"] = function() { abort("'callMain' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "abort")) Module["abort"] = function() { abort("'abort' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "stringToNewUTF8")) Module["stringToNewUTF8"] = function() { abort("'stringToNewUTF8' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "setFileTime")) Module["setFileTime"] = function() { abort("'setFileTime' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "abortOnCannotGrowMemory")) Module["abortOnCannotGrowMemory"] = function() { abort("'abortOnCannotGrowMemory' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "emscripten_realloc_buffer")) Module["emscripten_realloc_buffer"] = function() { abort("'emscripten_realloc_buffer' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "ENV")) Module["ENV"] = function() { abort("'ENV' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "ERRNO_CODES")) Module["ERRNO_CODES"] = function() { abort("'ERRNO_CODES' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "ERRNO_MESSAGES")) Module["ERRNO_MESSAGES"] = function() { abort("'ERRNO_MESSAGES' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "setErrNo")) Module["setErrNo"] = function() { abort("'setErrNo' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "inetPton4")) Module["inetPton4"] = function() { abort("'inetPton4' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "inetNtop4")) Module["inetNtop4"] = function() { abort("'inetNtop4' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "inetPton6")) Module["inetPton6"] = function() { abort("'inetPton6' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "inetNtop6")) Module["inetNtop6"] = function() { abort("'inetNtop6' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "readSockaddr")) Module["readSockaddr"] = function() { abort("'readSockaddr' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "writeSockaddr")) Module["writeSockaddr"] = function() { abort("'writeSockaddr' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "DNS")) Module["DNS"] = function() { abort("'DNS' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "getHostByName")) Module["getHostByName"] = function() { abort("'getHostByName' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "GAI_ERRNO_MESSAGES")) Module["GAI_ERRNO_MESSAGES"] = function() { abort("'GAI_ERRNO_MESSAGES' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "Protocols")) Module["Protocols"] = function() { abort("'Protocols' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "Sockets")) Module["Sockets"] = function() { abort("'Sockets' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "getRandomDevice")) Module["getRandomDevice"] = function() { abort("'getRandomDevice' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "traverseStack")) Module["traverseStack"] = function() { abort("'traverseStack' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "UNWIND_CACHE")) Module["UNWIND_CACHE"] = function() { abort("'UNWIND_CACHE' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "withBuiltinMalloc")) Module["withBuiltinMalloc"] = function() { abort("'withBuiltinMalloc' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "readAsmConstArgsArray")) Module["readAsmConstArgsArray"] = function() { abort("'readAsmConstArgsArray' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "readAsmConstArgs")) Module["readAsmConstArgs"] = function() { abort("'readAsmConstArgs' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "mainThreadEM_ASM")) Module["mainThreadEM_ASM"] = function() { abort("'mainThreadEM_ASM' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "jstoi_q")) Module["jstoi_q"] = function() { abort("'jstoi_q' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "jstoi_s")) Module["jstoi_s"] = function() { abort("'jstoi_s' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "getExecutableName")) Module["getExecutableName"] = function() { abort("'getExecutableName' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "listenOnce")) Module["listenOnce"] = function() { abort("'listenOnce' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "autoResumeAudioContext")) Module["autoResumeAudioContext"] = function() { abort("'autoResumeAudioContext' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "dynCallLegacy")) Module["dynCallLegacy"] = function() { abort("'dynCallLegacy' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "getDynCaller")) Module["getDynCaller"] = function() { abort("'getDynCaller' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "dynCall")) Module["dynCall"] = function() { abort("'dynCall' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "callRuntimeCallbacks")) Module["callRuntimeCallbacks"] = function() { abort("'callRuntimeCallbacks' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "runtimeKeepaliveCounter")) Module["runtimeKeepaliveCounter"] = function() { abort("'runtimeKeepaliveCounter' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "keepRuntimeAlive")) Module["keepRuntimeAlive"] = function() { abort("'keepRuntimeAlive' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "runtimeKeepalivePush")) Module["runtimeKeepalivePush"] = function() { abort("'runtimeKeepalivePush' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "runtimeKeepalivePop")) Module["runtimeKeepalivePop"] = function() { abort("'runtimeKeepalivePop' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "callUserCallback")) Module["callUserCallback"] = function() { abort("'callUserCallback' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "maybeExit")) Module["maybeExit"] = function() { abort("'maybeExit' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "asmjsMangle")) Module["asmjsMangle"] = function() { abort("'asmjsMangle' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "reallyNegative")) Module["reallyNegative"] = function() { abort("'reallyNegative' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "unSign")) Module["unSign"] = function() { abort("'unSign' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "reSign")) Module["reSign"] = function() { abort("'reSign' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "formatString")) Module["formatString"] = function() { abort("'formatString' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "PATH")) Module["PATH"] = function() { abort("'PATH' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "PATH_FS")) Module["PATH_FS"] = function() { abort("'PATH_FS' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "SYSCALLS")) Module["SYSCALLS"] = function() { abort("'SYSCALLS' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "syscallMmap2")) Module["syscallMmap2"] = function() { abort("'syscallMmap2' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "syscallMunmap")) Module["syscallMunmap"] = function() { abort("'syscallMunmap' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "getSocketFromFD")) Module["getSocketFromFD"] = function() { abort("'getSocketFromFD' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "getSocketAddress")) Module["getSocketAddress"] = function() { abort("'getSocketAddress' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "JSEvents")) Module["JSEvents"] = function() { abort("'JSEvents' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "registerKeyEventCallback")) Module["registerKeyEventCallback"] = function() { abort("'registerKeyEventCallback' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "specialHTMLTargets")) Module["specialHTMLTargets"] = function() { abort("'specialHTMLTargets' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "maybeCStringToJsString")) Module["maybeCStringToJsString"] = function() { abort("'maybeCStringToJsString' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "findEventTarget")) Module["findEventTarget"] = function() { abort("'findEventTarget' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "findCanvasEventTarget")) Module["findCanvasEventTarget"] = function() { abort("'findCanvasEventTarget' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "getBoundingClientRect")) Module["getBoundingClientRect"] = function() { abort("'getBoundingClientRect' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "fillMouseEventData")) Module["fillMouseEventData"] = function() { abort("'fillMouseEventData' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "registerMouseEventCallback")) Module["registerMouseEventCallback"] = function() { abort("'registerMouseEventCallback' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "registerWheelEventCallback")) Module["registerWheelEventCallback"] = function() { abort("'registerWheelEventCallback' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "registerUiEventCallback")) Module["registerUiEventCallback"] = function() { abort("'registerUiEventCallback' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "registerFocusEventCallback")) Module["registerFocusEventCallback"] = function() { abort("'registerFocusEventCallback' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "fillDeviceOrientationEventData")) Module["fillDeviceOrientationEventData"] = function() { abort("'fillDeviceOrientationEventData' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "registerDeviceOrientationEventCallback")) Module["registerDeviceOrientationEventCallback"] = function() { abort("'registerDeviceOrientationEventCallback' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "fillDeviceMotionEventData")) Module["fillDeviceMotionEventData"] = function() { abort("'fillDeviceMotionEventData' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "registerDeviceMotionEventCallback")) Module["registerDeviceMotionEventCallback"] = function() { abort("'registerDeviceMotionEventCallback' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "screenOrientation")) Module["screenOrientation"] = function() { abort("'screenOrientation' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "fillOrientationChangeEventData")) Module["fillOrientationChangeEventData"] = function() { abort("'fillOrientationChangeEventData' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "registerOrientationChangeEventCallback")) Module["registerOrientationChangeEventCallback"] = function() { abort("'registerOrientationChangeEventCallback' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "fillFullscreenChangeEventData")) Module["fillFullscreenChangeEventData"] = function() { abort("'fillFullscreenChangeEventData' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "registerFullscreenChangeEventCallback")) Module["registerFullscreenChangeEventCallback"] = function() { abort("'registerFullscreenChangeEventCallback' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "registerRestoreOldStyle")) Module["registerRestoreOldStyle"] = function() { abort("'registerRestoreOldStyle' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "hideEverythingExceptGivenElement")) Module["hideEverythingExceptGivenElement"] = function() { abort("'hideEverythingExceptGivenElement' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "restoreHiddenElements")) Module["restoreHiddenElements"] = function() { abort("'restoreHiddenElements' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "setLetterbox")) Module["setLetterbox"] = function() { abort("'setLetterbox' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "currentFullscreenStrategy")) Module["currentFullscreenStrategy"] = function() { abort("'currentFullscreenStrategy' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "restoreOldWindowedStyle")) Module["restoreOldWindowedStyle"] = function() { abort("'restoreOldWindowedStyle' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "softFullscreenResizeWebGLRenderTarget")) Module["softFullscreenResizeWebGLRenderTarget"] = function() { abort("'softFullscreenResizeWebGLRenderTarget' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "doRequestFullscreen")) Module["doRequestFullscreen"] = function() { abort("'doRequestFullscreen' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "fillPointerlockChangeEventData")) Module["fillPointerlockChangeEventData"] = function() { abort("'fillPointerlockChangeEventData' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "registerPointerlockChangeEventCallback")) Module["registerPointerlockChangeEventCallback"] = function() { abort("'registerPointerlockChangeEventCallback' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "registerPointerlockErrorEventCallback")) Module["registerPointerlockErrorEventCallback"] = function() { abort("'registerPointerlockErrorEventCallback' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "requestPointerLock")) Module["requestPointerLock"] = function() { abort("'requestPointerLock' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "fillVisibilityChangeEventData")) Module["fillVisibilityChangeEventData"] = function() { abort("'fillVisibilityChangeEventData' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "registerVisibilityChangeEventCallback")) Module["registerVisibilityChangeEventCallback"] = function() { abort("'registerVisibilityChangeEventCallback' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "registerTouchEventCallback")) Module["registerTouchEventCallback"] = function() { abort("'registerTouchEventCallback' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "fillGamepadEventData")) Module["fillGamepadEventData"] = function() { abort("'fillGamepadEventData' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "registerGamepadEventCallback")) Module["registerGamepadEventCallback"] = function() { abort("'registerGamepadEventCallback' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "registerBeforeUnloadEventCallback")) Module["registerBeforeUnloadEventCallback"] = function() { abort("'registerBeforeUnloadEventCallback' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "fillBatteryEventData")) Module["fillBatteryEventData"] = function() { abort("'fillBatteryEventData' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "battery")) Module["battery"] = function() { abort("'battery' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "registerBatteryEventCallback")) Module["registerBatteryEventCallback"] = function() { abort("'registerBatteryEventCallback' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "setCanvasElementSize")) Module["setCanvasElementSize"] = function() { abort("'setCanvasElementSize' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "getCanvasElementSize")) Module["getCanvasElementSize"] = function() { abort("'getCanvasElementSize' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "polyfillSetImmediate")) Module["polyfillSetImmediate"] = function() { abort("'polyfillSetImmediate' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "demangle")) Module["demangle"] = function() { abort("'demangle' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "demangleAll")) Module["demangleAll"] = function() { abort("'demangleAll' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "jsStackTrace")) Module["jsStackTrace"] = function() { abort("'jsStackTrace' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "stackTrace")) Module["stackTrace"] = function() { abort("'stackTrace' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "getEnvStrings")) Module["getEnvStrings"] = function() { abort("'getEnvStrings' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "checkWasiClock")) Module["checkWasiClock"] = function() { abort("'checkWasiClock' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "writeI53ToI64")) Module["writeI53ToI64"] = function() { abort("'writeI53ToI64' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "writeI53ToI64Clamped")) Module["writeI53ToI64Clamped"] = function() { abort("'writeI53ToI64Clamped' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "writeI53ToI64Signaling")) Module["writeI53ToI64Signaling"] = function() { abort("'writeI53ToI64Signaling' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "writeI53ToU64Clamped")) Module["writeI53ToU64Clamped"] = function() { abort("'writeI53ToU64Clamped' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "writeI53ToU64Signaling")) Module["writeI53ToU64Signaling"] = function() { abort("'writeI53ToU64Signaling' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "readI53FromI64")) Module["readI53FromI64"] = function() { abort("'readI53FromI64' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "readI53FromU64")) Module["readI53FromU64"] = function() { abort("'readI53FromU64' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "convertI32PairToI53")) Module["convertI32PairToI53"] = function() { abort("'convertI32PairToI53' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "convertU32PairToI53")) Module["convertU32PairToI53"] = function() { abort("'convertU32PairToI53' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "uncaughtExceptionCount")) Module["uncaughtExceptionCount"] = function() { abort("'uncaughtExceptionCount' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "exceptionLast")) Module["exceptionLast"] = function() { abort("'exceptionLast' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "exceptionCaught")) Module["exceptionCaught"] = function() { abort("'exceptionCaught' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "ExceptionInfoAttrs")) Module["ExceptionInfoAttrs"] = function() { abort("'ExceptionInfoAttrs' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "ExceptionInfo")) Module["ExceptionInfo"] = function() { abort("'ExceptionInfo' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "CatchInfo")) Module["CatchInfo"] = function() { abort("'CatchInfo' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "exception_addRef")) Module["exception_addRef"] = function() { abort("'exception_addRef' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "exception_decRef")) Module["exception_decRef"] = function() { abort("'exception_decRef' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "Browser")) Module["Browser"] = function() { abort("'Browser' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "funcWrappers")) Module["funcWrappers"] = function() { abort("'funcWrappers' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "getFuncWrapper")) Module["getFuncWrapper"] = function() { abort("'getFuncWrapper' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "setMainLoop")) Module["setMainLoop"] = function() { abort("'setMainLoop' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "FS")) Module["FS"] = function() { abort("'FS' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "mmapAlloc")) Module["mmapAlloc"] = function() { abort("'mmapAlloc' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "MEMFS")) Module["MEMFS"] = function() { abort("'MEMFS' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "TTY")) Module["TTY"] = function() { abort("'TTY' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "PIPEFS")) Module["PIPEFS"] = function() { abort("'PIPEFS' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "SOCKFS")) Module["SOCKFS"] = function() { abort("'SOCKFS' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "_setNetworkCallback")) Module["_setNetworkCallback"] = function() { abort("'_setNetworkCallback' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "tempFixedLengthArray")) Module["tempFixedLengthArray"] = function() { abort("'tempFixedLengthArray' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "miniTempWebGLFloatBuffers")) Module["miniTempWebGLFloatBuffers"] = function() { abort("'miniTempWebGLFloatBuffers' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "heapObjectForWebGLType")) Module["heapObjectForWebGLType"] = function() { abort("'heapObjectForWebGLType' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "heapAccessShiftForWebGLHeap")) Module["heapAccessShiftForWebGLHeap"] = function() { abort("'heapAccessShiftForWebGLHeap' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "GL")) Module["GL"] = function() { abort("'GL' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "emscriptenWebGLGet")) Module["emscriptenWebGLGet"] = function() { abort("'emscriptenWebGLGet' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "computeUnpackAlignedImageSize")) Module["computeUnpackAlignedImageSize"] = function() { abort("'computeUnpackAlignedImageSize' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "emscriptenWebGLGetTexPixelData")) Module["emscriptenWebGLGetTexPixelData"] = function() { abort("'emscriptenWebGLGetTexPixelData' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "emscriptenWebGLGetUniform")) Module["emscriptenWebGLGetUniform"] = function() { abort("'emscriptenWebGLGetUniform' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "webglGetUniformLocation")) Module["webglGetUniformLocation"] = function() { abort("'webglGetUniformLocation' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "webglPrepareUniformLocationsBeforeFirstUse")) Module["webglPrepareUniformLocationsBeforeFirstUse"] = function() { abort("'webglPrepareUniformLocationsBeforeFirstUse' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "webglGetLeftBracePos")) Module["webglGetLeftBracePos"] = function() { abort("'webglGetLeftBracePos' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "emscriptenWebGLGetVertexAttrib")) Module["emscriptenWebGLGetVertexAttrib"] = function() { abort("'emscriptenWebGLGetVertexAttrib' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "writeGLArray")) Module["writeGLArray"] = function() { abort("'writeGLArray' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "AL")) Module["AL"] = function() { abort("'AL' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "SDL_unicode")) Module["SDL_unicode"] = function() { abort("'SDL_unicode' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "SDL_ttfContext")) Module["SDL_ttfContext"] = function() { abort("'SDL_ttfContext' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "SDL_audio")) Module["SDL_audio"] = function() { abort("'SDL_audio' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "SDL")) Module["SDL"] = function() { abort("'SDL' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "SDL_gfx")) Module["SDL_gfx"] = function() { abort("'SDL_gfx' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "GLUT")) Module["GLUT"] = function() { abort("'GLUT' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "EGL")) Module["EGL"] = function() { abort("'EGL' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "GLFW_Window")) Module["GLFW_Window"] = function() { abort("'GLFW_Window' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "GLFW")) Module["GLFW"] = function() { abort("'GLFW' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "GLEW")) Module["GLEW"] = function() { abort("'GLEW' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "IDBStore")) Module["IDBStore"] = function() { abort("'IDBStore' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "runAndAbortIfError")) Module["runAndAbortIfError"] = function() { abort("'runAndAbortIfError' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "Asyncify")) Module["Asyncify"] = function() { abort("'Asyncify' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "Fibers")) Module["Fibers"] = function() { abort("'Fibers' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "GLEmulation")) Module["GLEmulation"] = function() { abort("'GLEmulation' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "GLImmediate")) Module["GLImmediate"] = function() { abort("'GLImmediate' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "GLImmediateSetup")) Module["GLImmediateSetup"] = function() { abort("'GLImmediateSetup' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "warnOnce")) Module["warnOnce"] = function() { abort("'warnOnce' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "stackSave")) Module["stackSave"] = function() { abort("'stackSave' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "stackRestore")) Module["stackRestore"] = function() { abort("'stackRestore' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "stackAlloc")) Module["stackAlloc"] = function() { abort("'stackAlloc' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "AsciiToString")) Module["AsciiToString"] = function() { abort("'AsciiToString' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "stringToAscii")) Module["stringToAscii"] = function() { abort("'stringToAscii' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "UTF16ToString")) Module["UTF16ToString"] = function() { abort("'UTF16ToString' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "stringToUTF16")) Module["stringToUTF16"] = function() { abort("'stringToUTF16' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "lengthBytesUTF16")) Module["lengthBytesUTF16"] = function() { abort("'lengthBytesUTF16' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "UTF32ToString")) Module["UTF32ToString"] = function() { abort("'UTF32ToString' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "stringToUTF32")) Module["stringToUTF32"] = function() { abort("'stringToUTF32' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "lengthBytesUTF32")) Module["lengthBytesUTF32"] = function() { abort("'lengthBytesUTF32' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "allocateUTF8")) Module["allocateUTF8"] = function() { abort("'allocateUTF8' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
if (!Object.getOwnPropertyDescriptor(Module, "allocateUTF8OnStack")) Module["allocateUTF8OnStack"] = function() { abort("'allocateUTF8OnStack' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") };
Module["writeStackCookie"] = writeStackCookie;
Module["checkStackCookie"] = checkStackCookie;
if (!Object.getOwnPropertyDescriptor(Module, "ALLOC_NORMAL")) Object.defineProperty(Module, "ALLOC_NORMAL", { configurable: true, get: function() { abort("'ALLOC_NORMAL' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") } });
if (!Object.getOwnPropertyDescriptor(Module, "ALLOC_STACK")) Object.defineProperty(Module, "ALLOC_STACK", { configurable: true, get: function() { abort("'ALLOC_STACK' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)") } });

var calledRun;

/**
 * @constructor
 * @this {ExitStatus}
 */
function ExitStatus(status) {
  this.name = "ExitStatus";
  this.message = "Program terminated with exit(" + status + ")";
  this.status = status;
}

var calledMain = false;

dependenciesFulfilled = function runCaller() {
  // If run has never been called, and we should call run (INVOKE_RUN is true, and Module.noInitialRun is not false)
  if (!calledRun) run();
  if (!calledRun) dependenciesFulfilled = runCaller; // try this again later, after new deps are fulfilled
};

function callMain(args) {
  assert(runDependencies == 0, 'cannot call main when async dependencies remain! (listen on Module["onRuntimeInitialized"])');
  assert(__ATPRERUN__.length == 0, 'cannot call main when preRun functions remain to be called');

  var entryFunction = Module['_main'];

  args = args || [];

  var argc = args.length+1;
  var argv = stackAlloc((argc + 1) * 4);
  HEAP32[argv >> 2] = allocateUTF8OnStack(thisProgram);
  for (var i = 1; i < argc; i++) {
    HEAP32[(argv >> 2) + i] = allocateUTF8OnStack(args[i - 1]);
  }
  HEAP32[(argv >> 2) + argc] = 0;

  try {

    var ret = entryFunction(argc, argv);

    // In PROXY_TO_PTHREAD builds, we should never exit the runtime below, as
    // execution is asynchronously handed off to a pthread.
    // if we are saving the stack, then do not call exit, we are not
    // really exiting now, just unwinding the JS stack
    if (!keepRuntimeAlive()) {
      // if we're not running an evented main loop, it's time to exit
      exit(ret, /* implicit = */ true);
    }
  }
  catch(e) {
    if (e instanceof ExitStatus) {
      // exit() throws this once it's done to make sure execution
      // has been stopped completely
      return;
    } else if (e == 'unwind') {
      // running an evented main loop, don't immediately exit
      return;
    } else {
      var toLog = e;
      if (e && typeof e === 'object' && e.stack) {
        toLog = [e, e.stack];
      }
      err('exception thrown: ' + toLog);
      quit_(1, e);
    }
  } finally {
    calledMain = true;

  }
}

function stackCheckInit() {
  // This is normally called automatically during __wasm_call_ctors but need to
  // get these values before even running any of the ctors so we call it redundantly
  // here.
  // TODO(sbc): Move writeStackCookie to native to to avoid this.
  _emscripten_stack_init();
  writeStackCookie();
}

/** @type {function(Array=)} */
function run(args) {
  args = args || arguments_;

  if (runDependencies > 0) {
    return;
  }

  stackCheckInit();

  preRun();

  // a preRun added a dependency, run will be called later
  if (runDependencies > 0) {
    return;
  }

  function doRun() {
    // run may have just been called through dependencies being fulfilled just in this very frame,
    // or while the async setStatus time below was happening
    if (calledRun) return;
    calledRun = true;
    Module['calledRun'] = true;

    if (ABORT) return;

    initRuntime();

    preMain();

    if (Module['onRuntimeInitialized']) Module['onRuntimeInitialized']();

    if (shouldRunNow) callMain(args);

    postRun();
  }

  if (Module['setStatus']) {
    Module['setStatus']('Running...');
    setTimeout(function() {
      setTimeout(function() {
        Module['setStatus']('');
      }, 1);
      doRun();
    }, 1);
  } else
  {
    doRun();
  }
  checkStackCookie();
}
Module['run'] = run;

function checkUnflushedContent() {
  // Compiler settings do not allow exiting the runtime, so flushing
  // the streams is not possible. but in ASSERTIONS mode we check
  // if there was something to flush, and if so tell the user they
  // should request that the runtime be exitable.
  // Normally we would not even include flush() at all, but in ASSERTIONS
  // builds we do so just for this check, and here we see if there is any
  // content to flush, that is, we check if there would have been
  // something a non-ASSERTIONS build would have not seen.
  // How we flush the streams depends on whether we are in SYSCALLS_REQUIRE_FILESYSTEM=0
  // mode (which has its own special function for this; otherwise, all
  // the code is inside libc)
  var oldOut = out;
  var oldErr = err;
  var has = false;
  out = err = function(x) {
    has = true;
  }
  try { // it doesn't matter if it fails
    var flush = Module['_fflush'];
    if (flush) flush(0);
    // also flush in the JS FS layer
    ['stdout', 'stderr'].forEach(function(name) {
      var info = FS.analyzePath('/dev/' + name);
      if (!info) return;
      var stream = info.object;
      var rdev = stream.rdev;
      var tty = TTY.ttys[rdev];
      if (tty && tty.output && tty.output.length) {
        has = true;
      }
    });
  } catch(e) {}
  out = oldOut;
  err = oldErr;
  if (has) {
    warnOnce('stdio streams had content in them that was not flushed. you should set EXIT_RUNTIME to 1 (see the FAQ), or make sure to emit a newline when you printf etc.');
  }
}

/** @param {boolean|number=} implicit */
function exit(status, implicit) {
  EXITSTATUS = status;

  checkUnflushedContent();

  // if this is just main exit-ing implicitly, and the status is 0, then we
  // don't need to do anything here and can just leave. if the status is
  // non-zero, though, then we need to report it.
  // (we may have warned about this earlier, if a situation justifies doing so)
  if (implicit && keepRuntimeAlive() && status === 0) {
    return;
  }

  if (keepRuntimeAlive()) {
    // if exit() was called, we may warn the user if the runtime isn't actually being shut down
    if (!implicit) {
      var msg = 'program exited (with status: ' + status + '), but EXIT_RUNTIME is not set, so halting execution but not exiting the runtime or preventing further async execution (build with EXIT_RUNTIME=1, if you want a true shutdown)';
      err(msg);
    }
  } else {

    exitRuntime();

    if (Module['onExit']) Module['onExit'](status);

    ABORT = true;
  }

  quit_(status, new ExitStatus(status));
}

if (Module['preInit']) {
  if (typeof Module['preInit'] == 'function') Module['preInit'] = [Module['preInit']];
  while (Module['preInit'].length > 0) {
    Module['preInit'].pop()();
  }
}

// shouldRunNow refers to calling main(), not run().
var shouldRunNow = true;

if (Module['noInitialRun']) shouldRunNow = false;

run();