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wgl: Fix TLS initialization when statically linked #304

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wgl: Fix TLS initialization when statically linked #304

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38 changes: 28 additions & 10 deletions src/dispatch_wgl.c
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@

#include "dispatch_common.h"

static INIT_ONCE initialized = INIT_ONCE_STATIC_INIT;
static bool first_context_current = false;
static bool already_switched_to_dispatch_table = false;

Expand Down Expand Up @@ -62,6 +63,29 @@ epoxy_has_wgl_extension(HDC hdc, const char *ext)
return epoxy_extension_in_string(getext(hdc), ext);
}

BOOL
epoxy_initialize_tls(PINIT_ONCE once, PVOID param, PVOID *context)
{
void *data;

gl_tls_index = TlsAlloc();
if (gl_tls_index == TLS_OUT_OF_INDEXES)
return FALSE;
wgl_tls_index = TlsAlloc();
if (wgl_tls_index == TLS_OUT_OF_INDEXES)
return FALSE;

first_context_current = false;

data = LocalAlloc(LPTR, gl_tls_size);
TlsSetValue(gl_tls_index, data);

data = LocalAlloc(LPTR, wgl_tls_size);
TlsSetValue(wgl_tls_index, data);

return TRUE;
}

/**
* Does the work necessary to update the win32 per-thread dispatch
* tables when wglMakeCurrent() is called.
Expand All @@ -78,6 +102,8 @@ epoxy_handle_external_wglMakeCurrent(void)
if (!first_context_current) {
first_context_current = true;
} else {
InitOnceExecuteOnce(&initialized, epoxy_initialize_tls, NULL, NULL);

if (!already_switched_to_dispatch_table) {
already_switched_to_dispatch_table = true;
gl_switch_to_dispatch_table();
Expand All @@ -103,16 +129,8 @@ DllMain(HINSTANCE dll, DWORD reason, LPVOID reserved)

switch (reason) {
case DLL_PROCESS_ATTACH:
gl_tls_index = TlsAlloc();
if (gl_tls_index == TLS_OUT_OF_INDEXES)
return FALSE;
wgl_tls_index = TlsAlloc();
if (wgl_tls_index == TLS_OUT_OF_INDEXES)
return FALSE;

first_context_current = false;

/* FALLTHROUGH */
InitOnceExecuteOnce(&initialized, epoxy_initialize_tls, NULL, NULL);
break;

case DLL_THREAD_ATTACH:
data = LocalAlloc(LPTR, gl_tls_size);
Expand Down