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renderer_raytrace_clusters.cpp
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/*
* Copyright (c) 2024-2025, NVIDIA CORPORATION. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* SPDX-FileCopyrightText: Copyright (c) 2024-2025, NVIDIA CORPORATION.
* SPDX-License-Identifier: Apache-2.0
*/
#include <nvvk/raytraceKHR_vk.hpp>
#include <nvvk/sbtwrapper_vk.hpp>
#include <nvvk/images_vk.hpp>
#include <nvvkhl/pipeline_container.hpp>
#include <nvh/parallel_work.hpp>
#include <nvh/misc.hpp>
#include "renderer.hpp"
#include "vk_nv_cluster_acc.h"
//////////////////////////////////////////////////////////////////////////
// these settings are for debugging / temporary workarounds
#define DEBUG_SPLIT_INIT 1
//////////////////////////////////////////////////////////////////////////
namespace animatedclusters {
class RendererRayTraceClusters : public Renderer
{
public:
virtual bool init(Resources& res, Scene& scene, const RendererConfig& config) override;
virtual void render(VkCommandBuffer primary, Resources& res, Scene& scene, const FrameConfig& frame, nvvk::ProfilerVK& profiler) override;
virtual void deinit(Resources& res) override;
virtual void updatedFrameBuffer(Resources& res);
private:
bool initShaders(Resources& res, Scene& scene, const RendererConfig& config);
void updateRayTracingScene(VkCommandBuffer cmd, Resources& res, Scene& scene, const FrameConfig& frame, nvvk::ProfilerVK& profiler);
void updateRayTracingClusters(VkCommandBuffer cmd, Resources& res, Scene& scene);
void updateRayTracingBlas(VkCommandBuffer cmd, Resources& res, Scene& scene);
bool initRayTracingScene(Resources& res, Scene& scene, const RendererConfig& config);
void initRayTracingTemplates(Resources& res, Scene& scene, const RendererConfig& config);
void initRayTracingTemplateInstantiations(Resources& res, Scene& scene, const RendererConfig& config);
void initRayTracingClusters(Resources& res, Scene& scene, const RendererConfig& config);
bool initRayTracingBlas(Resources& res, Scene& scene, const RendererConfig& config);
void initRayTracingPipeline(Resources& res);
VkPhysicalDeviceRayTracingPipelinePropertiesKHR m_rtProperties{VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_RAY_TRACING_PIPELINE_PROPERTIES_KHR};
nvvk::SBTWrapper m_rtSbt; // Shading binding table wrapper
nvvkhl::PipelineContainer m_rtPipe; // Hold pipelines and layout
struct Shaders
{
nvvk::ShaderModuleID rayGenShader;
nvvk::ShaderModuleID closestHitShader;
nvvk::ShaderModuleID missShader;
nvvk::ShaderModuleID missShaderAO;
nvvk::ShaderModuleID computeStatistics;
} m_shaders;
VkPipeline m_computeStatisticsPipeline = nullptr;
VkPipelineLayout m_computeStatisticsLayout = nullptr;
nvvk::DescriptorSetContainer m_dsetContainer;
// auxiliary rendering data
uint32_t m_numTotalClusters = 0;
VkClusterAccelerationStructureTriangleClusterInputNV m_clusterTriangleInput;
VkClusterAccelerationStructureClustersBottomLevelInputNV m_clusterBlasInput;
struct GeometryTemplate
{
RBuffer templatesBuffer;
std::vector<uint64_t> templateAddresses;
std::vector<uint32_t> instantionOffsets;
uint32_t sumInstantionSizes;
};
struct RenderInstanceClusterData
{
RBuffer clusterBuffer;
};
std::vector<GeometryTemplate> m_geometryTemplates;
std::vector<RenderInstanceClusterData> m_renderInstanceClusters;
// we pre-compute this once for all instances
// given we use predetermined allocation sizes.
//
// args to build clusters for entire scene
// pre-computed, explicit mode
// if we use templates
RBuffer m_instantiationInfoBuffer; // explicit instantiation src
// otherwise
RBuffer m_clusterBuildInfoBuffer; // implicit cluster build src
// both store resulting clusters here, this is fed into
// blas build
RBuffer m_clusterDstBuffer; // explicit cluster dst for instantiation, otherwise implicit dst
RBuffer m_clusterSizeBuffer; // just for statistics
// updated every frame
RBuffer m_clusterBuffer; // cluster dst content
RLargeBuffer m_clusterBlasBuffer; // blas dst content
RBuffer m_renderInstanceClusterBlasInfoBuffer; // blas build src
RBuffer m_renderInstanceClusterBlasSizeBuffer; // just for statistics
VkDeviceSize m_scratchSize = 0;
RBuffer m_scratchBuffer;
};
bool RendererRayTraceClusters::initShaders(Resources& res, Scene& scene, const RendererConfig& config)
{
std::string prepend = nvh::stringFormat("#define CLUSTER_DEDICATED_VERTICES %d\n", scene.m_config.clusterDedicatedVertices);
// do shaders first, most likely to contain errors
m_shaders.rayGenShader = res.m_shaderManager.createShaderModule(VK_SHADER_STAGE_RAYGEN_BIT_KHR, "render_raytrace.rgen.glsl");
m_shaders.closestHitShader = res.m_shaderManager.createShaderModule(VK_SHADER_STAGE_CLOSEST_HIT_BIT_KHR,
"render_raytrace_clusters.rchit.glsl", prepend);
m_shaders.missShader = res.m_shaderManager.createShaderModule(VK_SHADER_STAGE_MISS_BIT_KHR, "render_raytrace.rmiss.glsl",
"#define RAYTRACING_PAYLOAD_INDEX 0\n");
m_shaders.missShaderAO = res.m_shaderManager.createShaderModule(VK_SHADER_STAGE_MISS_BIT_KHR, "render_raytrace.rmiss.glsl",
"#define RAYTRACING_PAYLOAD_INDEX 1\n");
m_shaders.computeStatistics = res.m_shaderManager.createShaderModule(VK_SHADER_STAGE_COMPUTE_BIT, "cluster_statistics.comp.glsl");
if(!res.verifyShaders(m_shaders))
{
return false;
}
return initBasicShaders(res, scene, config);
}
bool RendererRayTraceClusters::init(Resources& res, Scene& scene, const RendererConfig& config)
{
m_config = config;
if(!initShaders(res, scene, config))
return false;
initBasics(res, scene, config);
m_resourceUsageInfo.sceneMemBytes += scene.m_sceneClusterMemBytes;
VkPhysicalDeviceProperties2 prop2{VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_PROPERTIES_2, &m_rtProperties};
vkGetPhysicalDeviceProperties2(res.m_physical, &prop2);
if(!initRayTracingScene(res, scene, config))
{
return false;
}
initRayTracingPipeline(res);
{
VkPushConstantRange pushRange;
pushRange.offset = 0;
pushRange.size = sizeof(shaderio::StatisticsConstants);
pushRange.stageFlags = VK_SHADER_STAGE_COMPUTE_BIT;
VkPipelineLayoutCreateInfo layoutInfo = {VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO};
layoutInfo.pPushConstantRanges = &pushRange;
layoutInfo.pushConstantRangeCount = 1;
vkCreatePipelineLayout(res.m_device, &layoutInfo, nullptr, &m_computeStatisticsLayout);
VkComputePipelineCreateInfo compInfo = {VK_STRUCTURE_TYPE_COMPUTE_PIPELINE_CREATE_INFO};
compInfo.stage = {VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO};
compInfo.stage.stage = VK_SHADER_STAGE_COMPUTE_BIT;
compInfo.stage.pName = "main";
compInfo.layout = m_computeStatisticsLayout;
compInfo.flags = VK_PIPELINE_CREATE_CAPTURE_INTERNAL_REPRESENTATIONS_BIT_KHR;
compInfo.stage.module = res.m_shaderManager.get(m_shaders.computeStatistics);
vkCreateComputePipelines(res.m_device, nullptr, 1, &compInfo, nullptr, &m_computeStatisticsPipeline);
}
return true;
}
void RendererRayTraceClusters::render(VkCommandBuffer primary, Resources& res, Scene& scene, const FrameConfig& frame, nvvk::ProfilerVK& profiler)
{
if(m_config.doAnimation)
{
updateAnimation(primary, res, scene, frame, profiler);
{
auto timerSection = profiler.timeRecurring("AS Build/Refit", primary);
updateRayTracingScene(primary, res, scene, frame, profiler);
}
}
vkCmdUpdateBuffer(primary, res.m_common.view.buffer, 0, sizeof(shaderio::FrameConstants), (const uint32_t*)&frame.frameConstants);
vkCmdFillBuffer(primary, res.m_common.readbackDevice.buffer, 0, sizeof(shaderio::Readback), 0);
VkMemoryBarrier memBarrier{VK_STRUCTURE_TYPE_MEMORY_BARRIER};
memBarrier.srcAccessMask = VK_ACCESS_SHADER_WRITE_BIT | VK_ACCESS_TRANSFER_WRITE_BIT;
memBarrier.dstAccessMask = VK_ACCESS_SHADER_READ_BIT | VK_ACCESS_UNIFORM_READ_BIT;
vkCmdPipelineBarrier(primary, VK_PIPELINE_STAGE_TRANSFER_BIT | VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT,
VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT, 0, 1, &memBarrier, 0, nullptr, 0, nullptr);
res.cmdImageTransition(primary, res.m_framebuffer.imgColor, VK_IMAGE_ASPECT_COLOR_BIT, VK_IMAGE_LAYOUT_GENERAL);
// Ray trace
{
auto timerSection = profiler.timeRecurring("Render", primary);
if(frame.drawObjects)
{
vkCmdBindPipeline(primary, VK_PIPELINE_BIND_POINT_RAY_TRACING_KHR, m_rtPipe.plines[0]);
vkCmdBindDescriptorSets(primary, VK_PIPELINE_BIND_POINT_RAY_TRACING_KHR, m_rtPipe.layout, 0, 1,
m_dsetContainer.getSets(), 0, nullptr);
const std::array<VkStridedDeviceAddressRegionKHR, 4>& bindingTables = m_rtSbt.getRegions();
vkCmdTraceRaysKHR(primary, &bindingTables[0], &bindingTables[1], &bindingTables[2], &bindingTables[3],
frame.frameConstants.viewport.x, frame.frameConstants.viewport.y, 1);
}
}
{
// statistics
shaderio::StatisticsConstants statisticsConstants;
// over all clusters
vkCmdBindPipeline(primary, VK_PIPELINE_BIND_POINT_COMPUTE, m_computeStatisticsPipeline);
uint32_t numClusters = uint32_t(m_clusterSizeBuffer.info.range / sizeof(uint32_t));
statisticsConstants.count = numClusters;
statisticsConstants.sizes = m_clusterSizeBuffer.address;
statisticsConstants.sum = res.m_common.readbackDevice.address + offsetof(shaderio::Readback, clustersSize);
vkCmdPushConstants(primary, m_computeStatisticsLayout, VK_SHADER_STAGE_COMPUTE_BIT, 0,
sizeof(shaderio::StatisticsConstants), &statisticsConstants);
vkCmdDispatch(primary, (numClusters + STATISTICS_WORKGROUP_SIZE - 1) / STATISTICS_WORKGROUP_SIZE, 1, 1);
uint32_t numInstances = uint32_t(m_renderInstanceClusterBlasSizeBuffer.info.range / sizeof(uint32_t));
statisticsConstants.count = numInstances;
statisticsConstants.sizes = m_renderInstanceClusterBlasSizeBuffer.address;
statisticsConstants.sum = res.m_common.readbackDevice.address + offsetof(shaderio::Readback, blasesSize);
vkCmdPushConstants(primary, m_computeStatisticsLayout, VK_SHADER_STAGE_COMPUTE_BIT, 0,
sizeof(shaderio::StatisticsConstants), &statisticsConstants);
vkCmdDispatch(primary, (numInstances + STATISTICS_WORKGROUP_SIZE - 1) / STATISTICS_WORKGROUP_SIZE, 1, 1);
}
}
void RendererRayTraceClusters::updateRayTracingScene(VkCommandBuffer cmd, Resources& res, Scene& scene, const FrameConfig& frame, nvvk::ProfilerVK& profiler)
{
// wait for animation update
VkMemoryBarrier memBarrier = {VK_STRUCTURE_TYPE_MEMORY_BARRIER};
memBarrier.srcAccessMask = VK_ACCESS_SHADER_WRITE_BIT;
memBarrier.dstAccessMask = VK_ACCESS_ACCELERATION_STRUCTURE_READ_BIT_KHR;
vkCmdPipelineBarrier(cmd, VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT, VK_PIPELINE_STAGE_ACCELERATION_STRUCTURE_BUILD_BIT_KHR,
0, 1, &memBarrier, 0, nullptr, 0, nullptr);
// run template instantiation or clas build
{
auto timerSection = profiler.timeRecurring("clas", cmd);
updateRayTracingClusters(cmd, res, scene);
}
memBarrier.srcAccessMask = VK_ACCESS_ACCELERATION_STRUCTURE_WRITE_BIT_KHR | VK_ACCESS_ACCELERATION_STRUCTURE_READ_BIT_KHR;
memBarrier.dstAccessMask = VK_ACCESS_ACCELERATION_STRUCTURE_WRITE_BIT_KHR | VK_ACCESS_ACCELERATION_STRUCTURE_READ_BIT_KHR;
vkCmdPipelineBarrier(cmd, VK_PIPELINE_STAGE_ACCELERATION_STRUCTURE_BUILD_BIT_KHR,
VK_PIPELINE_STAGE_ACCELERATION_STRUCTURE_BUILD_BIT_KHR, 0, 1, &memBarrier, 0, nullptr, 0, nullptr);
// run blas build
{
auto timerSection = profiler.timeRecurring("blas", cmd);
updateRayTracingBlas(cmd, res, scene);
}
memBarrier.srcAccessMask = VK_ACCESS_ACCELERATION_STRUCTURE_WRITE_BIT_KHR | VK_ACCESS_ACCELERATION_STRUCTURE_READ_BIT_KHR;
memBarrier.dstAccessMask = VK_ACCESS_ACCELERATION_STRUCTURE_WRITE_BIT_KHR | VK_ACCESS_ACCELERATION_STRUCTURE_READ_BIT_KHR;
vkCmdPipelineBarrier(cmd, VK_PIPELINE_STAGE_ACCELERATION_STRUCTURE_BUILD_BIT_KHR,
VK_PIPELINE_STAGE_ACCELERATION_STRUCTURE_BUILD_BIT_KHR, 0, 1, &memBarrier, 0, nullptr, 0, nullptr);
// run tlas build/update
{
auto timerSection = profiler.timeRecurring("tlas", cmd);
updateRayTracingTlas(cmd, res, scene, !frame.forceTlasFullRebuild);
}
memBarrier.srcAccessMask = VK_ACCESS_ACCELERATION_STRUCTURE_WRITE_BIT_KHR | VK_ACCESS_ACCELERATION_STRUCTURE_READ_BIT_KHR;
memBarrier.dstAccessMask = VK_ACCESS_ACCELERATION_STRUCTURE_READ_BIT_KHR;
vkCmdPipelineBarrier(cmd, VK_PIPELINE_STAGE_ACCELERATION_STRUCTURE_BUILD_BIT_KHR,
VK_PIPELINE_STAGE_RAY_TRACING_SHADER_BIT_KHR, 0, 1, &memBarrier, 0, nullptr, 0, nullptr);
}
void RendererRayTraceClusters::updateRayTracingClusters(VkCommandBuffer cmd, Resources& res, Scene& scene)
{
VkClusterAccelerationStructureCommandsInfoNV cmdInfo = {VK_STRUCTURE_TYPE_CLUSTER_ACCELERATION_STRUCTURE_COMMANDS_INFO_NV};
VkClusterAccelerationStructureInputInfoNV inputs = {VK_STRUCTURE_TYPE_CLUSTER_ACCELERATION_STRUCTURE_INPUT_INFO_NV};
if(m_config.useTemplates)
{
// setup instantiation inputs
inputs.maxAccelerationStructureCount = m_numTotalClusters;
inputs.opMode = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_MODE_EXPLICIT_DESTINATIONS_NV;
inputs.opType = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_TYPE_INSTANTIATE_TRIANGLE_CLUSTER_NV;
inputs.opInput.pTriangleClusters = &m_clusterTriangleInput;
inputs.flags = m_config.templateInstantiateFlags;
cmdInfo.dstAddressesArray.deviceAddress = m_clusterDstBuffer.address;
cmdInfo.dstAddressesArray.size = m_clusterDstBuffer.info.range;
cmdInfo.dstAddressesArray.stride = sizeof(uint64_t);
cmdInfo.dstSizesArray.deviceAddress = m_clusterSizeBuffer.address;
cmdInfo.dstSizesArray.size = m_clusterSizeBuffer.info.range;
cmdInfo.dstSizesArray.stride = sizeof(uint32_t);
cmdInfo.srcInfosArray.deviceAddress = m_instantiationInfoBuffer.address;
cmdInfo.srcInfosArray.size = m_instantiationInfoBuffer.info.range;
cmdInfo.srcInfosArray.stride = sizeof(VkClusterAccelerationStructureInstantiateClusterInfoNV);
cmdInfo.scratchData = m_scratchBuffer.address;
cmdInfo.input = inputs;
vkCmdBuildClusterAccelerationStructureIndirectNV(cmd, &cmdInfo);
}
else
{
// setup cluster build inputs
inputs.maxAccelerationStructureCount = m_numTotalClusters;
// use implicit if we don't have per render instance cluster buffers
inputs.opMode = m_renderInstanceClusters.empty() ? VK_CLUSTER_ACCELERATION_STRUCTURE_OP_MODE_IMPLICIT_DESTINATIONS_NV :
VK_CLUSTER_ACCELERATION_STRUCTURE_OP_MODE_EXPLICIT_DESTINATIONS_NV;
inputs.opType = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_TYPE_BUILD_TRIANGLE_CLUSTER_NV;
inputs.opInput.pTriangleClusters = &m_clusterTriangleInput;
inputs.flags = m_config.clusterBuildFlags;
cmdInfo.dstImplicitData = m_clusterBuffer.address; // can be zero if explicit
cmdInfo.dstAddressesArray.deviceAddress = m_clusterDstBuffer.address;
cmdInfo.dstAddressesArray.size = m_clusterDstBuffer.info.range;
cmdInfo.dstAddressesArray.stride = sizeof(uint64_t);
cmdInfo.dstSizesArray.deviceAddress = m_clusterSizeBuffer.address;
cmdInfo.dstSizesArray.size = m_clusterSizeBuffer.info.range;
cmdInfo.dstSizesArray.stride = sizeof(uint32_t);
cmdInfo.srcInfosArray.deviceAddress = m_clusterBuildInfoBuffer.address;
cmdInfo.srcInfosArray.size = m_clusterBuildInfoBuffer.info.range;
cmdInfo.srcInfosArray.stride = sizeof(VkClusterAccelerationStructureBuildTriangleClusterInfoNV);
cmdInfo.scratchData = m_scratchBuffer.address;
cmdInfo.input = inputs;
vkCmdBuildClusterAccelerationStructureIndirectNV(cmd, &cmdInfo);
}
}
void RendererRayTraceClusters::updateRayTracingBlas(VkCommandBuffer cmd, Resources& res, Scene& scene)
{
VkClusterAccelerationStructureCommandsInfoNV cmdInfo = {VK_STRUCTURE_TYPE_CLUSTER_ACCELERATION_STRUCTURE_COMMANDS_INFO_NV};
VkClusterAccelerationStructureInputInfoNV inputs = {VK_STRUCTURE_TYPE_CLUSTER_ACCELERATION_STRUCTURE_INPUT_INFO_NV};
// setup blas inputs
inputs.maxAccelerationStructureCount = uint32_t(m_renderInstances.size());
inputs.opMode = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_MODE_IMPLICIT_DESTINATIONS_NV;
inputs.opType = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_TYPE_BUILD_CLUSTERS_BOTTOM_LEVEL_NV;
inputs.opInput.pClustersBottomLevel = &m_clusterBlasInput;
inputs.flags = m_config.clusterBlasFlags;
// we feed the generated blas addresses directly into the ray instances
cmdInfo.dstAddressesArray.deviceAddress =
m_tlasInstancesBuffer.address + offsetof(VkAccelerationStructureInstanceKHR, accelerationStructureReference);
cmdInfo.dstAddressesArray.size = m_tlasInstancesBuffer.info.range;
cmdInfo.dstAddressesArray.stride = sizeof(VkAccelerationStructureInstanceKHR);
cmdInfo.dstSizesArray.deviceAddress = m_renderInstanceClusterBlasSizeBuffer.address;
cmdInfo.dstSizesArray.size = m_renderInstanceClusterBlasSizeBuffer.info.range;
cmdInfo.dstSizesArray.stride = sizeof(uint32_t);
cmdInfo.srcInfosArray.deviceAddress = m_renderInstanceClusterBlasInfoBuffer.address;
cmdInfo.srcInfosArray.size = m_renderInstanceClusterBlasInfoBuffer.info.range;
cmdInfo.srcInfosArray.stride = sizeof(VkClusterAccelerationStructureBuildClustersBottomLevelInfoNV);
// in implicit mode we provide one big chunk from which outputs are sub-allocated
cmdInfo.dstImplicitData = m_clusterBlasBuffer.address;
cmdInfo.scratchData = m_scratchBuffer.address;
cmdInfo.input = inputs;
vkCmdBuildClusterAccelerationStructureIndirectNV(cmd, &cmdInfo);
}
bool RendererRayTraceClusters::initRayTracingScene(Resources& res, Scene& scene, const RendererConfig& config)
{
// used for cluster builds or instantiations
// which do entire scene at once
m_clusterTriangleInput = {VK_STRUCTURE_TYPE_CLUSTER_ACCELERATION_STRUCTURE_TRIANGLE_CLUSTER_INPUT_NV};
m_clusterTriangleInput.vertexFormat = VK_FORMAT_R32G32B32_SFLOAT;
m_clusterTriangleInput.maxClusterTriangleCount = scene.m_config.clusterTriangles;
m_clusterTriangleInput.maxClusterVertexCount = scene.m_config.clusterVertices;
m_clusterTriangleInput.maxTotalTriangleCount = 0;
m_clusterTriangleInput.maxTotalVertexCount = 0;
m_clusterTriangleInput.minPositionTruncateBitCount = config.positionTruncateBits;
for(size_t i = 0; i < m_renderInstances.size(); i++)
{
const shaderio::RenderInstance& renderInstance = m_renderInstances[i];
const Scene::Geometry& geometry = scene.m_geometries[renderInstance.geometryID];
m_clusterTriangleInput.maxTotalTriangleCount += geometry.numTriangles;
m_clusterTriangleInput.maxTotalVertexCount += uint32_t(geometry.clusterLocalVertices.size());
m_numTotalClusters += geometry.numClusters;
}
if(config.useTemplates)
{
initRayTracingTemplates(res, scene, config);
initRayTracingTemplateInstantiations(res, scene, config);
}
else
{
initRayTracingClusters(res, scene, config);
}
// BLAS creation
if(!initRayTracingBlas(res, scene, config))
{
deinit(res);
return false;
}
// TLAS creation
initRayTracingTlas(res, scene, config);
m_scratchBuffer = res.createBuffer(m_scratchSize, VK_BUFFER_USAGE_STORAGE_BUFFER_BIT);
m_resourceUsageInfo.rtOtherMemBytes += m_scratchBuffer.info.range;
// initial build
{
VkCommandBuffer cmd = res.createTempCmdBuffer();
updateRayTracingClusters(cmd, res, scene);
VkMemoryBarrier memBarrier = {VK_STRUCTURE_TYPE_MEMORY_BARRIER};
memBarrier.srcAccessMask = VK_ACCESS_ACCELERATION_STRUCTURE_WRITE_BIT_KHR | VK_ACCESS_ACCELERATION_STRUCTURE_READ_BIT_KHR;
memBarrier.dstAccessMask = VK_ACCESS_ACCELERATION_STRUCTURE_WRITE_BIT_KHR | VK_ACCESS_ACCELERATION_STRUCTURE_READ_BIT_KHR;
vkCmdPipelineBarrier(cmd, VK_PIPELINE_STAGE_ACCELERATION_STRUCTURE_BUILD_BIT_KHR,
VK_PIPELINE_STAGE_RAY_TRACING_SHADER_BIT_KHR, 0, 1, &memBarrier, 0, nullptr, 0, nullptr);
updateRayTracingBlas(cmd, res, scene);
memBarrier.srcAccessMask = VK_ACCESS_ACCELERATION_STRUCTURE_WRITE_BIT_KHR
| VK_ACCESS_ACCELERATION_STRUCTURE_READ_BIT_KHR | VK_ACCESS_TRANSFER_WRITE_BIT;
memBarrier.dstAccessMask = VK_ACCESS_ACCELERATION_STRUCTURE_READ_BIT_KHR | VK_ACCESS_ACCELERATION_STRUCTURE_WRITE_BIT_KHR;
vkCmdPipelineBarrier(cmd, VK_PIPELINE_STAGE_ACCELERATION_STRUCTURE_BUILD_BIT_KHR | VK_PIPELINE_STAGE_TRANSFER_BIT,
VK_PIPELINE_STAGE_RAY_TRACING_SHADER_BIT_KHR, 0, 1, &memBarrier, 0, nullptr, 0, nullptr);
updateRayTracingTlas(cmd, res, scene);
printf("submitting cluster init\n");
res.tempSyncSubmit(cmd);
printf("done\n");
}
return true;
}
void RendererRayTraceClusters::initRayTracingTemplates(Resources& res, Scene& scene, const RendererConfig& config)
{
// This function generates templates for every geometry
// and figures out the instantiation size for each cluster.
//
// Storage space for the instantiated CLAS is setup within `RendererRayTraceClusters::initRayTracingTemplateInstantiations`
assert(config.useTemplates);
m_geometryTemplates.resize(scene.m_geometries.size());
bool useImplicitTemplates = config.useImplicitTemplates;
RBuffer implicitBuffer;
// we use the same scratch buffer for various operations
VkDeviceSize tempScratchSize = 0;
// slightly lower totals because we do one geometry at a time for template builds.
VkClusterAccelerationStructureTriangleClusterInputNV templateTriangleInput = {
VK_STRUCTURE_TYPE_CLUSTER_ACCELERATION_STRUCTURE_TRIANGLE_CLUSTER_INPUT_NV};
templateTriangleInput.vertexFormat = VK_FORMAT_R32G32B32_SFLOAT;
templateTriangleInput.maxClusterTriangleCount = scene.m_config.clusterTriangles;
templateTriangleInput.maxClusterVertexCount = scene.m_config.clusterVertices;
templateTriangleInput.maxTotalTriangleCount = scene.m_maxPerGeometryTriangles;
templateTriangleInput.maxTotalVertexCount = scene.m_maxPerGeometryClusterVertices;
templateTriangleInput.minPositionTruncateBitCount = config.positionTruncateBits;
VkClusterAccelerationStructureMoveObjectsInputNV moveInput = {VK_STRUCTURE_TYPE_CLUSTER_ACCELERATION_STRUCTURE_MOVE_OBJECTS_INPUT_NV};
// following operations are done per cluster in advance
VkClusterAccelerationStructureInputInfoNV inputs = {VK_STRUCTURE_TYPE_CLUSTER_ACCELERATION_STRUCTURE_INPUT_INFO_NV};
inputs.maxAccelerationStructureCount = scene.m_maxPerGeometryClusters;
inputs.opType = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_TYPE_BUILD_TRIANGLE_CLUSTER_TEMPLATE_NV;
inputs.opMode = useImplicitTemplates ? VK_CLUSTER_ACCELERATION_STRUCTURE_OP_MODE_IMPLICIT_DESTINATIONS_NV :
VK_CLUSTER_ACCELERATION_STRUCTURE_OP_MODE_EXPLICIT_DESTINATIONS_NV;
inputs.opInput.pTriangleClusters = &templateTriangleInput;
inputs.flags = config.templateBuildFlags;
VkAccelerationStructureBuildSizesInfoKHR sizesInfo = {VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_SIZES_INFO_KHR};
vkGetClusterAccelerationStructureBuildSizesNV(res.m_device, &inputs, &sizesInfo);
tempScratchSize = std::max(tempScratchSize, sizesInfo.buildScratchSize);
if(useImplicitTemplates)
{
implicitBuffer = res.createBuffer(sizesInfo.accelerationStructureSize, VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_STORAGE_BIT_KHR
| VK_BUFFER_USAGE_STORAGE_BUFFER_BIT
| VK_BUFFER_USAGE_TRANSFER_SRC_BIT);
// implicit builds are not guaranteed to be perfectly compact either, we run an extra compaction step after the implicit build.
moveInput.type = VK_CLUSTER_ACCELERATION_STRUCTURE_TYPE_TRIANGLE_CLUSTER_TEMPLATE_NV;
moveInput.noMoveOverlap = VK_TRUE; // we move/copy from implicitBuffer to final per-geometry buffer
moveInput.maxMovedBytes = sizesInfo.accelerationStructureSize; // worst case everything is moved
inputs.opType = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_TYPE_MOVE_OBJECTS_NV;
inputs.opMode = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_MODE_EXPLICIT_DESTINATIONS_NV;
inputs.flags = 0;
inputs.opInput.pMoveObjects = &moveInput;
vkGetClusterAccelerationStructureBuildSizesNV(res.m_device, &inputs, &sizesInfo);
tempScratchSize = std::max(tempScratchSize, sizesInfo.updateScratchSize);
}
else
{
// when not doing implicit build, we want to query the sizes in advance.
inputs.opType = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_TYPE_BUILD_TRIANGLE_CLUSTER_TEMPLATE_NV;
inputs.opMode = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_MODE_COMPUTE_SIZES_NV;
inputs.flags = config.templateBuildFlags;
vkGetClusterAccelerationStructureBuildSizesNV(res.m_device, &inputs, &sizesInfo);
tempScratchSize = std::max(tempScratchSize, sizesInfo.buildScratchSize);
}
// to know how big the clusters will be after instantiation we query their s
inputs.opInput.pTriangleClusters = &templateTriangleInput;
inputs.opType = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_TYPE_INSTANTIATE_TRIANGLE_CLUSTER_NV;
inputs.opMode = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_MODE_COMPUTE_SIZES_NV;
inputs.flags = config.templateInstantiateFlags;
vkGetClusterAccelerationStructureBuildSizesNV(res.m_device, &inputs, &sizesInfo);
tempScratchSize = std::max(tempScratchSize, sizesInfo.buildScratchSize);
// let's setup temporary resources
RBuffer scratchBuffer = res.createBuffer(tempScratchSize, VK_BUFFER_USAGE_STORAGE_BUFFER_BIT
| VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_STORAGE_BIT_KHR);
std::vector<VkClusterAccelerationStructureBuildTriangleClusterTemplateInfoNV> templateInfos(scene.m_maxPerGeometryClusters);
std::vector<VkClusterAccelerationStructureInstantiateClusterInfoNV> instantiateInfos(scene.m_maxPerGeometryClusters);
size_t infoSize = std::max(std::max(sizeof(VkClusterAccelerationStructureBuildTriangleClusterTemplateInfoNV),
sizeof(VkClusterAccelerationStructureInstantiateClusterInfoNV)),
sizeof(VkClusterAccelerationStructureMoveObjectsInfoNV));
RBuffer infosBuffer = res.createBuffer(infoSize * templateInfos.size(),
VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR,
VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT);
RBuffer sizesBuffer = res.createBuffer(sizeof(uint32_t) * instantiateInfos.size(),
VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR,
VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT);
RBuffer dstAddressesBuffer = res.createBuffer(sizeof(uint64_t) * instantiateInfos.size(),
VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR,
VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT);
// 32 byte alignment requirement for bbox
struct TemplateBbox
{
shaderio::BBox bbox;
uint32_t _pad[2];
};
RBuffer bboxesBuffer = res.createBuffer(sizeof(TemplateBbox) * instantiateInfos.size(),
VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR,
VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT);
for(size_t g = 0; g < scene.m_geometries.size(); g++)
{
GeometryTemplate& geometryTemplate = m_geometryTemplates[g];
const Scene::Geometry& geometry = scene.m_geometries[g];
uint32_t numClusters = uint32_t(geometry.clusters.size());
float bloatSize = glm::length(geometry.bbox.hi - geometry.bbox.lo) * config.templateBBoxBloat;
auto* templateInfosMapping =
reinterpret_cast<VkClusterAccelerationStructureBuildTriangleClusterTemplateInfoNV*>(infosBuffer.mapping);
for(uint32_t c = 0; c < numClusters; c++)
{
const shaderio::Cluster& cluster = geometry.clusters[c];
VkClusterAccelerationStructureBuildTriangleClusterTemplateInfoNV& templateInfo = templateInfosMapping[c];
// add bloat to original bbox
TemplateBbox& tempBbox = ((TemplateBbox*)bboxesBuffer.mapping)[c];
shaderio::BBox clusterBbox = geometry.clusterBboxes[c];
clusterBbox.lo -= bloatSize;
clusterBbox.hi += bloatSize;
tempBbox.bbox = clusterBbox;
templateInfo = {0};
templateInfo.clusterID = c;
templateInfo.vertexCount = cluster.numVertices;
templateInfo.triangleCount = cluster.numTriangles;
templateInfo.baseGeometryIndexAndGeometryFlags.geometryFlags = VK_CLUSTER_ACCELERATION_STRUCTURE_GEOMETRY_OPAQUE_BIT_NV;
if(scene.m_config.clusterDedicatedVertices)
{
templateInfo.indexBuffer = geometry.clusterLocalTrianglesBuffer.address + (sizeof(uint8_t) * cluster.firstLocalTriangle);
templateInfo.indexBufferStride = sizeof(uint8_t);
templateInfo.indexType = VK_CLUSTER_ACCELERATION_STRUCTURE_INDEX_FORMAT_8BIT_NV;
templateInfo.vertexBuffer = geometry.positionsBuffer.address + (sizeof(glm::vec3) * cluster.firstLocalVertex);
templateInfo.vertexBufferStride = sizeof(glm::vec3);
}
else
{
templateInfo.indexBuffer = geometry.trianglesBuffer.address + (sizeof(uint32_t) * cluster.firstTriangle * 3);
templateInfo.indexBufferStride = sizeof(uint32_t);
templateInfo.indexType = VK_CLUSTER_ACCELERATION_STRUCTURE_INDEX_FORMAT_32BIT_NV;
templateInfo.vertexBuffer = geometry.positionsBuffer.address;
templateInfo.vertexBufferStride = sizeof(glm::vec3);
}
templateInfo.positionTruncateBitCount = config.positionTruncateBits;
templateInfo.instantiationBoundingBoxLimit =
config.templateBBoxBloat < 0 ? 0 : bboxesBuffer.address + sizeof(TemplateBbox) * c;
}
// actual count of current geometry
inputs.maxAccelerationStructureCount = numClusters;
VkCommandBuffer cmd;
VkClusterAccelerationStructureCommandsInfoNV cmdInfo = {VK_STRUCTURE_TYPE_CLUSTER_ACCELERATION_STRUCTURE_COMMANDS_INFO_NV};
cmdInfo.srcInfosArray.deviceAddress = infosBuffer.address;
cmdInfo.srcInfosArray.size = infosBuffer.info.range;
cmdInfo.srcInfosArray.stride = sizeof(VkClusterAccelerationStructureBuildTriangleClusterTemplateInfoNV);
cmdInfo.dstSizesArray.deviceAddress = sizesBuffer.address;
cmdInfo.dstSizesArray.size = sizesBuffer.info.range;
cmdInfo.dstSizesArray.stride = sizeof(uint32_t);
cmdInfo.dstAddressesArray.deviceAddress = dstAddressesBuffer.address;
cmdInfo.dstAddressesArray.size = dstAddressesBuffer.info.range;
cmdInfo.dstAddressesArray.stride = sizeof(uint64_t);
cmdInfo.scratchData = scratchBuffer.address;
if(useImplicitTemplates)
{
inputs.opMode = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_MODE_IMPLICIT_DESTINATIONS_NV;
inputs.opType = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_TYPE_BUILD_TRIANGLE_CLUSTER_TEMPLATE_NV;
inputs.flags = config.templateBuildFlags;
cmdInfo.dstImplicitData = implicitBuffer.address;
}
else
{
// query size of templates
inputs.opMode = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_MODE_COMPUTE_SIZES_NV;
inputs.opType = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_TYPE_BUILD_TRIANGLE_CLUSTER_TEMPLATE_NV;
inputs.flags = config.templateBuildFlags;
}
cmd = res.createTempCmdBuffer();
cmdInfo.input = inputs;
vkCmdBuildClusterAccelerationStructureIndirectNV(cmd, &cmdInfo);
res.tempSyncSubmit(cmd);
// compute template buffer sizes
uint32_t buildSum = 0;
for(uint32_t c = 0; c < numClusters; c++)
{
buildSum += ((const uint32_t*)sizesBuffer.mapping)[c];
}
// allocate outputs and setup dst addresses
geometryTemplate.templatesBuffer = res.createBuffer(buildSum, VK_BUFFER_USAGE_RAY_TRACING_BIT_NV);
m_resourceUsageInfo.rtOtherMemBytes += buildSum;
geometryTemplate.templateAddresses.resize(numClusters);
if(useImplicitTemplates)
{
// after the implicit build, let's move from the scratch implicit buffer
// to the final per-geometry buffer in a compacted fashion.
// compute address / offset for each template
uint64_t* dstAddresses = ((uint64_t*)dstAddressesBuffer.mapping);
buildSum = 0;
auto* moveInfosMapping = reinterpret_cast<VkClusterAccelerationStructureMoveObjectsInfoNV*>(infosBuffer.mapping);
for(uint32_t c = 0; c < numClusters; c++)
{
geometryTemplate.templateAddresses[c] = geometryTemplate.templatesBuffer.address + buildSum;
uint32_t templateSize = ((const uint32_t*)sizesBuffer.mapping)[c];
// read from old address
moveInfosMapping[c].srcAccelerationStructure = dstAddresses[c];
// setup new dst address
dstAddresses[c] = geometryTemplate.templateAddresses[c];
assert(templateSize);
buildSum += templateSize;
}
cmd = res.createTempCmdBuffer();
inputs.opType = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_TYPE_MOVE_OBJECTS_NV;
inputs.opMode = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_MODE_EXPLICIT_DESTINATIONS_NV;
inputs.flags = 0;
inputs.opInput.pMoveObjects = &moveInput;
cmdInfo.srcInfosArray.deviceAddress = infosBuffer.address;
cmdInfo.srcInfosArray.size = infosBuffer.info.range;
cmdInfo.srcInfosArray.stride = sizeof(VkClusterAccelerationStructureMoveObjectsInfoNV);
cmdInfo.dstSizesArray.deviceAddress = 0;
cmdInfo.dstSizesArray.size = 0;
cmdInfo.dstSizesArray.stride = 0;
cmdInfo.dstAddressesArray.deviceAddress = dstAddressesBuffer.address;
cmdInfo.dstAddressesArray.size = dstAddressesBuffer.info.range;
cmdInfo.dstAddressesArray.stride = sizeof(uint64_t);
cmdInfo.input = inputs;
vkCmdBuildClusterAccelerationStructureIndirectNV(cmd, &cmdInfo);
res.tempSyncSubmit(cmd);
}
else
{
uint64_t* dstAddresses = ((uint64_t*)dstAddressesBuffer.mapping);
buildSum = 0;
for(uint32_t c = 0; c < numClusters; c++)
{
dstAddresses[c] = geometryTemplate.templatesBuffer.address + buildSum;
geometryTemplate.templateAddresses[c] = geometryTemplate.templatesBuffer.address + buildSum;
buildSum += ((const uint32_t*)sizesBuffer.mapping)[c];
}
// build explicit
inputs.opMode = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_MODE_EXPLICIT_DESTINATIONS_NV;
cmd = res.createTempCmdBuffer();
cmdInfo.input = inputs;
vkCmdBuildClusterAccelerationStructureIndirectNV(cmd, &cmdInfo);
res.tempSyncSubmit(cmd);
}
// now compute instantiation sizes
geometryTemplate.instantionOffsets.resize(numClusters);
auto* instantiationInfosMapping =
reinterpret_cast<VkClusterAccelerationStructureInstantiateClusterInfoNV*>(infosBuffer.mapping);
for(uint32_t c = 0; c < numClusters; c++)
{
const shaderio::Cluster& cluster = geometry.clusters[c];
VkClusterAccelerationStructureInstantiateClusterInfoNV& instantiationInfo = instantiationInfosMapping[c];
instantiationInfo.clusterIdOffset = 0;
instantiationInfo.clusterTemplateAddress = geometryTemplate.templateAddresses[c];
instantiationInfo.geometryIndexOffset = 0;
// leave vertices off given we are looking for worst case instantiation size, not actual
instantiationInfo.vertexBuffer.startAddress = 0;
instantiationInfo.vertexBuffer.strideInBytes = 0;
}
// query size of instantiations
inputs.opMode = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_MODE_COMPUTE_SIZES_NV;
inputs.opType = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_TYPE_INSTANTIATE_TRIANGLE_CLUSTER_NV;
inputs.flags = config.templateInstantiateFlags;
cmdInfo.srcInfosArray.deviceAddress = infosBuffer.address;
cmdInfo.srcInfosArray.size = infosBuffer.info.range;
cmdInfo.srcInfosArray.stride = sizeof(VkClusterAccelerationStructureInstantiateClusterInfoNV);
cmdInfo.dstSizesArray.deviceAddress = sizesBuffer.address;
cmdInfo.dstSizesArray.size = sizesBuffer.info.range;
cmdInfo.dstSizesArray.stride = sizeof(uint32_t);
cmdInfo.dstAddressesArray.deviceAddress = 0;
cmdInfo.dstAddressesArray.size = 0;
cmdInfo.dstAddressesArray.stride = 0;
cmd = res.createTempCmdBuffer();
cmdInfo.input = inputs;
vkCmdBuildClusterAccelerationStructureIndirectNV(cmd, &cmdInfo);
res.tempSyncSubmit(cmd);
// compute output offsets for instantiations, and total sum
// this is later used for building the per-instance clusters
geometryTemplate.instantionOffsets.resize(numClusters);
uint32_t instantiationSum = 0;
for(uint32_t c = 0; c < numClusters; c++)
{
geometryTemplate.instantionOffsets[c] = instantiationSum;
uint32_t instantiationSize = ((const uint32_t*)sizesBuffer.mapping)[c];
assert(instantiationSize);
instantiationSum += instantiationSize;
}
geometryTemplate.sumInstantionSizes = instantiationSum;
}
// delete temp resources
res.destroy(scratchBuffer);
res.destroy(infosBuffer);
res.destroy(sizesBuffer);
res.destroy(dstAddressesBuffer);
res.destroy(bboxesBuffer);
res.destroy(implicitBuffer);
}
void RendererRayTraceClusters::initRayTracingTemplateInstantiations(Resources& res, Scene& scene, const RendererConfig& config)
{
// After we built the templates we now allocate destination space for the CLAS that are generated during
// template instantiation.
// We also upload the information for the instantiation step. At runtime we only have to update the vertex
// buffers and can the run the build from these pre-generated inputs.
assert(config.useTemplates);
{
VkClusterAccelerationStructureInputInfoNV inputs = {VK_STRUCTURE_TYPE_CLUSTER_ACCELERATION_STRUCTURE_INPUT_INFO_NV};
inputs.maxAccelerationStructureCount = 1;
inputs.opType = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_TYPE_INSTANTIATE_TRIANGLE_CLUSTER_NV;
inputs.opMode = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_MODE_EXPLICIT_DESTINATIONS_NV;
inputs.opInput.pTriangleClusters = &m_clusterTriangleInput;
inputs.flags = 0;
VkAccelerationStructureBuildSizesInfoKHR sizesInfo = {VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_SIZES_INFO_KHR};
vkGetClusterAccelerationStructureBuildSizesNV(res.m_device, &inputs, &sizesInfo);
m_scratchSize = std::max(m_scratchSize, sizesInfo.buildScratchSize);
}
// for every instance we create its own cluster buffer (allows us to more easily circumvent 4 GB buffer size limitations)
m_renderInstanceClusters.resize(m_renderInstances.size());
size_t instantionSize = 0;
size_t numClusters = 0;
for(size_t i = 0; i < m_renderInstances.size(); i++)
{
uint32_t geometryID = m_renderInstances[i].geometryID;
m_renderInstanceClusters[i].clusterBuffer =
res.createBuffer(m_geometryTemplates[geometryID].sumInstantionSizes,
VK_BUFFER_USAGE_STORAGE_BUFFER_BIT | VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_STORAGE_BIT_KHR
| VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR);
m_resourceUsageInfo.rtClasMemBytes += m_renderInstanceClusters[i].clusterBuffer.info.range;
numClusters += m_geometryTemplates[geometryID].instantionOffsets.size();
}
// the actual instantiation process gets argument buffers for the entire scene
m_instantiationInfoBuffer =
res.createBuffer(sizeof(VkClusterAccelerationStructureInstantiateClusterInfoNV) * numClusters,
VK_BUFFER_USAGE_STORAGE_BUFFER_BIT | VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR);
m_resourceUsageInfo.rtOtherMemBytes += m_instantiationInfoBuffer.info.range;
m_clusterDstBuffer = res.createBuffer(sizeof(uint64_t) * numClusters,
VK_BUFFER_USAGE_STORAGE_BUFFER_BIT
| VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR);
m_resourceUsageInfo.rtOtherMemBytes += m_clusterDstBuffer.info.range;
m_clusterSizeBuffer = res.createBuffer(sizeof(uint32_t) * numClusters,
VK_BUFFER_USAGE_STORAGE_BUFFER_BIT
| VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR);
m_resourceUsageInfo.rtOtherMemBytes += m_clusterSizeBuffer.info.range;
// fill instantiation task data
// for now on cpu, more typically this would be done on GPU based on culling etc.
std::vector<VkClusterAccelerationStructureInstantiateClusterInfoNV> instantiationInfos(numClusters, {0});
std::vector<uint64_t> instantiationDst(numClusters, {0});
size_t clusterOffset = 0;
for(size_t i = 0; i < m_renderInstances.size(); i++)
{
const shaderio::RenderInstance& renderInstance = m_renderInstances[i];
const RenderInstanceClusterData& renderInstanceCluster = m_renderInstanceClusters[i];
GeometryTemplate& geometryTemplate = m_geometryTemplates[renderInstance.geometryID];
const Scene::Geometry& geometry = scene.m_geometries[renderInstance.geometryID];
// setup instantiation
uint64_t baseAddress = renderInstanceCluster.clusterBuffer.address;
for(size_t c = 0; c < geometry.clusters.size(); c++)
{
const shaderio::Cluster& cluster = geometry.clusters[c];
// input
VkClusterAccelerationStructureInstantiateClusterInfoNV& instInfo = instantiationInfos[clusterOffset + c];
instInfo.clusterIdOffset = 0; // stored in template
instInfo.clusterTemplateAddress = geometryTemplate.templateAddresses[c];
if(scene.m_config.clusterDedicatedVertices)
{
instInfo.vertexBuffer.startAddress = renderInstance.positions + (sizeof(glm::vec3) * cluster.firstLocalVertex);
instInfo.vertexBuffer.strideInBytes = sizeof(glm::vec3);
}
else
{
// we don't use per-cluster vertices
instInfo.vertexBuffer.startAddress = renderInstance.positions;
instInfo.vertexBuffer.strideInBytes = sizeof(glm::vec3);
}
// destination
uint32_t instOffset = geometryTemplate.instantionOffsets[c];
uint64_t clusterAddress = baseAddress + instOffset;
instantiationDst[clusterOffset + c] = clusterAddress;
}
clusterOffset += geometry.clusters.size();
}
// these buffers are used during the CLAS build process in `RendererRayTraceClusters::updateRayTracingClusters`
res.simpleUploadBuffer(m_instantiationInfoBuffer, instantiationInfos.data());
res.simpleUploadBuffer(m_clusterDstBuffer, instantiationDst.data());
}
void RendererRayTraceClusters::initRayTracingClusters(Resources& res, Scene& scene, const RendererConfig& config)
{
// When not using templates we upload the CLAS build arguments for all runtime generated CLAS.
// During CLAS build they re-use the same index buffers, but are fetching the vertices for
// each instance individually.
// The output space for the CLAS is based on the worst-case size of the largest cluster and
// we pre-configure the CLAS destination addresses accordingly.
// This will take more memory than the template way, which allowed us to query the size of the
// individual template in advance, independent of the final vertex positions.
assert(!config.useTemplates);
VkClusterAccelerationStructureInputInfoNV inputs = {VK_STRUCTURE_TYPE_CLUSTER_ACCELERATION_STRUCTURE_INPUT_INFO_NV};
inputs.maxAccelerationStructureCount = m_numTotalClusters;
inputs.opType = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_TYPE_BUILD_TRIANGLE_CLUSTER_NV;
inputs.opMode = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_MODE_IMPLICIT_DESTINATIONS_NV;
inputs.opInput.pTriangleClusters = &m_clusterTriangleInput;
inputs.flags = config.clusterBuildFlags;
VkAccelerationStructureBuildSizesInfoKHR sizesInfo = {VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_SIZES_INFO_KHR};
vkGetClusterAccelerationStructureBuildSizesNV(res.m_device, &inputs, &sizesInfo);
m_scratchSize = std::max(m_scratchSize, sizesInfo.buildScratchSize);
// We can build clusters for the entire scene either in implicit or explicit mode.
// Implicit requires that we have one single destination buffer for all clusters.
// This however can cause issues with max buffer size.
bool useExplicit =
sizesInfo.accelerationStructureSize > std::min(res.m_context->m_physicalInfo.properties11.maxMemoryAllocationSize,
res.m_context->m_physicalInfo.properties13.maxBufferSize);
VkDeviceSize singleExplicitClusterSize = 0;
if(useExplicit)
{
// in explicit we manually distribute the clusters across multiple buffers
inputs.opMode = VK_CLUSTER_ACCELERATION_STRUCTURE_OP_MODE_EXPLICIT_DESTINATIONS_NV;
inputs.opInput.pTriangleClusters = &m_clusterTriangleInput;
vkGetClusterAccelerationStructureBuildSizesNV(res.m_device, &inputs, &sizesInfo);
m_scratchSize = std::max(m_scratchSize, sizesInfo.buildScratchSize);
// in explicit the returned size is that of one element
singleExplicitClusterSize = sizesInfo.accelerationStructureSize;
m_renderInstanceClusters.resize(m_renderInstances.size());
for(size_t i = 0; i < m_renderInstances.size(); i++)
{
uint32_t geometryID = m_renderInstances[i].geometryID;