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Create top level acceleration structure

This commit is contained in:
Magnus Norddahl 2021-10-31 01:15:49 +02:00
parent 0065d91f44
commit 1b29ef02b9
2 changed files with 218 additions and 111 deletions
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308
src/lightmap/gpuraytracer.cpp
View File

@ -31,123 +31,17 @@ void GPURaytracer::Raytrace(LevelMesh* level)
{
mesh = level;
std::unique_ptr<VulkanCommandPool> cmdpool = std::make_unique<VulkanCommandPool>(device.get(), device->graphicsFamily);
std::unique_ptr<VulkanCommandBuffer> cmdbuffer = cmdpool->createBuffer();
cmdpool = std::make_unique<VulkanCommandPool>(device.get(), device->graphicsFamily);
cmdbuffer = cmdpool->createBuffer();
printf("Creating vertex and index buffers\n");
size_t vertexbuffersize = (size_t)mesh->MeshVertices.Size() * sizeof(Vec3);
size_t indexbuffersize = (size_t)mesh->MeshElements.Size() * sizeof(uint32_t);
size_t transferbuffersize = vertexbuffersize + indexbuffersize;
size_t vertexoffset = 0;
size_t indexoffset = vertexoffset + vertexbuffersize;
BufferBuilder vbuilder;
vbuilder.setUsage(VK_BUFFER_USAGE_VERTEX_BUFFER_BIT | VK_IMAGE_USAGE_TRANSFER_DST_BIT);
vbuilder.setSize(vertexbuffersize);
auto vertexBuffer = vbuilder.create(device.get());
BufferBuilder ibuilder;
ibuilder.setUsage(VK_BUFFER_USAGE_INDEX_BUFFER_BIT | VK_IMAGE_USAGE_TRANSFER_DST_BIT);
ibuilder.setSize(indexbuffersize);
auto indexBuffer = ibuilder.create(device.get());
BufferBuilder tbuilder;
tbuilder.setUsage(VK_BUFFER_USAGE_TRANSFER_SRC_BIT, VMA_MEMORY_USAGE_CPU_ONLY);
tbuilder.setSize(transferbuffersize);
auto transferBuffer = tbuilder.create(device.get());
auto data = (uint8_t*)transferBuffer->Map(0, transferbuffersize);
memcpy(data + vertexoffset, mesh->MeshVertices.Data(), vertexbuffersize);
memcpy(data + indexoffset, mesh->MeshElements.Data(), indexbuffersize);
transferBuffer->Unmap();
cmdbuffer->copyBuffer(transferBuffer.get(), vertexBuffer.get(), vertexoffset);
cmdbuffer->copyBuffer(transferBuffer.get(), indexBuffer.get(), indexoffset);
CreateVertexAndIndexBuffers();
printf("Creating bottom level acceleration structure\n");
VkBufferDeviceAddressInfo info = { VK_STRUCTURE_TYPE_BUFFER_DEVICE_ADDRESS_INFO };
info.buffer = vertexBuffer->buffer;
VkDeviceAddress vertexAddress = vkGetBufferDeviceAddress(device->device, &info);
info = { VK_STRUCTURE_TYPE_BUFFER_DEVICE_ADDRESS_INFO };
info.buffer = indexBuffer->buffer;
VkDeviceAddress indexAddress = vkGetBufferDeviceAddress(device->device, &info);
VkAccelerationStructureGeometryTrianglesDataKHR triangles = { VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_TRIANGLES_DATA_KHR };
triangles.vertexFormat = VK_FORMAT_R32G32B32_SFLOAT;
triangles.vertexData.deviceAddress = vertexAddress;
triangles.vertexStride = sizeof(Vec3);
triangles.indexType = VK_INDEX_TYPE_UINT32;
triangles.indexData.deviceAddress = indexAddress;
triangles.maxVertex = mesh->MeshVertices.Size();
VkAccelerationStructureGeometryKHR accelStructBLDesc = { VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_KHR };
accelStructBLDesc.geometryType = VK_GEOMETRY_TYPE_TRIANGLES_KHR;
accelStructBLDesc.flags = VK_GEOMETRY_OPAQUE_BIT_KHR;
accelStructBLDesc.geometry.triangles = triangles;
VkAccelerationStructureBuildRangeInfoKHR rangeInfo = {};
rangeInfo.firstVertex = 0;
rangeInfo.primitiveCount = mesh->MeshElements.Size() / 3;
rangeInfo.primitiveOffset = 0;
rangeInfo.transformOffset = 0;
VkAccelerationStructureBuildGeometryInfoKHR buildInfo = { VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_GEOMETRY_INFO_KHR };
buildInfo.type = VK_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL_KHR;
buildInfo.mode = VK_BUILD_ACCELERATION_STRUCTURE_MODE_BUILD_KHR;
buildInfo.flags = accelStructBLDesc.flags | VK_BUILD_ACCELERATION_STRUCTURE_PREFER_FAST_TRACE_BIT_KHR;
buildInfo.geometryCount = 1;
buildInfo.pGeometries = &accelStructBLDesc;
uint32_t maxPrimitiveCount = rangeInfo.primitiveCount;
VkAccelerationStructureBuildSizesInfoKHR sizeInfo = { VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_SIZES_INFO_KHR };
vkGetAccelerationStructureBuildSizesKHR(device->device, VK_ACCELERATION_STRUCTURE_BUILD_TYPE_DEVICE_KHR, &buildInfo, &maxPrimitiveCount, &sizeInfo);
BufferBuilder sbuilder;
sbuilder.setUsage(VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT | VK_BUFFER_USAGE_STORAGE_BUFFER_BIT);
sbuilder.setSize(sizeInfo.buildScratchSize);
auto scratchBuffer = sbuilder.create(device.get());
info = { VK_STRUCTURE_TYPE_BUFFER_DEVICE_ADDRESS_INFO };
info.buffer = scratchBuffer->buffer;
VkDeviceAddress scratchAddress = vkGetBufferDeviceAddress(device->device, &info);
BufferBuilder blbufbuilder;
blbufbuilder.setUsage(VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_STORAGE_BIT_KHR | VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT);
blbufbuilder.setSize(sizeInfo.accelerationStructureSize);
auto blAccelStructBuffer = blbufbuilder.create(device.get());
VkAccelerationStructureKHR blAccelStructHandle = {};
VkAccelerationStructureCreateInfoKHR createInfo = { VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_CREATE_INFO_KHR };
createInfo.type = VK_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL_KHR;
createInfo.buffer = blAccelStructBuffer->buffer;
createInfo.size = sizeInfo.accelerationStructureSize;
VkResult result = vkCreateAccelerationStructureKHR(device->device, &createInfo, nullptr, &blAccelStructHandle);
if (result != VK_SUCCESS)
throw std::runtime_error("vkCreateAccelerationStructureKHR failed");
auto blAccelStruct = std::make_unique<VulkanAccelerationStructure>(device.get(), blAccelStructHandle);
buildInfo.dstAccelerationStructure = blAccelStruct->accelstruct;
buildInfo.scratchData.deviceAddress = scratchAddress;
VkAccelerationStructureBuildRangeInfoKHR* rangeInfos[] = { &rangeInfo };
vkCmdBuildAccelerationStructuresKHR(cmdbuffer->buffer, 1, &buildInfo, rangeInfos);
CreateBottomLevelAccelerationStructure();
printf("Creating top level acceleration structure\n");
/*
Vec3 aabbs[2] = { mesh->MeshVertices[0], mesh->MeshVertices[1] };
for (Vec3& v : mesh->MeshVertices)
{
aabbs[0].x = std::min(aabbs[0].x, v.x);
aabbs[0].y = std::min(aabbs[0].y, v.y);
aabbs[0].z = std::min(aabbs[0].z, v.z);
aabbs[1].x = std::max(aabbs[1].x, v.x);
aabbs[1].y = std::max(aabbs[1].y, v.y);
aabbs[1].z = std::max(aabbs[1].z, v.z);
}
*/
CreateTopLevelAccelerationStructure();
printf("Tracing light probes\n");
@ -376,3 +270,195 @@ Vec3 GPURaytracer::GetSurfaceEmittance(Surface* surface, float distance)
return Vec3(0.0f);
}
}
void GPURaytracer::CreateVertexAndIndexBuffers()
{
size_t vertexbuffersize = (size_t)mesh->MeshVertices.Size() * sizeof(Vec3);
size_t indexbuffersize = (size_t)mesh->MeshElements.Size() * sizeof(uint32_t);
size_t transferbuffersize = vertexbuffersize + indexbuffersize;
size_t vertexoffset = 0;
size_t indexoffset = vertexoffset + vertexbuffersize;
BufferBuilder vbuilder;
vbuilder.setUsage(VK_BUFFER_USAGE_VERTEX_BUFFER_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT);
vbuilder.setSize(vertexbuffersize);
vertexBuffer = vbuilder.create(device.get());
BufferBuilder ibuilder;
ibuilder.setUsage(VK_BUFFER_USAGE_INDEX_BUFFER_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT);
ibuilder.setSize(indexbuffersize);
indexBuffer = ibuilder.create(device.get());
BufferBuilder tbuilder;
tbuilder.setUsage(VK_BUFFER_USAGE_TRANSFER_SRC_BIT, VMA_MEMORY_USAGE_CPU_ONLY);
tbuilder.setSize(transferbuffersize);
transferBuffer = tbuilder.create(device.get());
uint8_t* data = (uint8_t*)transferBuffer->Map(0, transferbuffersize);
memcpy(data + vertexoffset, mesh->MeshVertices.Data(), vertexbuffersize);
memcpy(data + indexoffset, mesh->MeshElements.Data(), indexbuffersize);
transferBuffer->Unmap();
cmdbuffer->copyBuffer(transferBuffer.get(), vertexBuffer.get(), vertexoffset);
cmdbuffer->copyBuffer(transferBuffer.get(), indexBuffer.get(), indexoffset);
VkMemoryBarrier barrier = { VK_STRUCTURE_TYPE_MEMORY_BARRIER };
barrier.srcAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT;
barrier.dstAccessMask = VK_ACCESS_ACCELERATION_STRUCTURE_WRITE_BIT_KHR;
vkCmdPipelineBarrier(cmdbuffer->buffer, VK_PIPELINE_STAGE_TRANSFER_BIT, VK_PIPELINE_STAGE_ACCELERATION_STRUCTURE_BUILD_BIT_KHR, 0, 1, &barrier, 0, nullptr, 0, nullptr);
}
void GPURaytracer::CreateBottomLevelAccelerationStructure()
{
VkBufferDeviceAddressInfo info = { VK_STRUCTURE_TYPE_BUFFER_DEVICE_ADDRESS_INFO };
info.buffer = vertexBuffer->buffer;
VkDeviceAddress vertexAddress = vkGetBufferDeviceAddress(device->device, &info);
info = { VK_STRUCTURE_TYPE_BUFFER_DEVICE_ADDRESS_INFO };
info.buffer = indexBuffer->buffer;
VkDeviceAddress indexAddress = vkGetBufferDeviceAddress(device->device, &info);
VkAccelerationStructureGeometryTrianglesDataKHR triangles = { VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_TRIANGLES_DATA_KHR };
triangles.vertexFormat = VK_FORMAT_R32G32B32_SFLOAT;
triangles.vertexData.deviceAddress = vertexAddress;
triangles.vertexStride = sizeof(Vec3);
triangles.indexType = VK_INDEX_TYPE_UINT32;
triangles.indexData.deviceAddress = indexAddress;
triangles.maxVertex = mesh->MeshVertices.Size();
VkAccelerationStructureGeometryKHR accelStructBLDesc = { VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_KHR };
accelStructBLDesc.geometryType = VK_GEOMETRY_TYPE_TRIANGLES_KHR;
accelStructBLDesc.flags = VK_GEOMETRY_OPAQUE_BIT_KHR;
accelStructBLDesc.geometry.triangles = triangles;
VkAccelerationStructureBuildRangeInfoKHR rangeInfo = {};
rangeInfo.primitiveCount = mesh->MeshElements.Size() / 3;
VkAccelerationStructureBuildGeometryInfoKHR buildInfo = { VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_GEOMETRY_INFO_KHR };
buildInfo.type = VK_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL_KHR;
buildInfo.mode = VK_BUILD_ACCELERATION_STRUCTURE_MODE_BUILD_KHR;
buildInfo.flags = accelStructBLDesc.flags | VK_BUILD_ACCELERATION_STRUCTURE_PREFER_FAST_TRACE_BIT_KHR;
buildInfo.geometryCount = 1;
buildInfo.pGeometries = &accelStructBLDesc;
uint32_t maxPrimitiveCount = rangeInfo.primitiveCount;
VkAccelerationStructureBuildSizesInfoKHR sizeInfo = { VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_SIZES_INFO_KHR };
vkGetAccelerationStructureBuildSizesKHR(device->device, VK_ACCELERATION_STRUCTURE_BUILD_TYPE_DEVICE_KHR, &buildInfo, &maxPrimitiveCount, &sizeInfo);
BufferBuilder blbufbuilder;
blbufbuilder.setUsage(VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_STORAGE_BIT_KHR | VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT);
blbufbuilder.setSize(sizeInfo.accelerationStructureSize);
blAccelStructBuffer = blbufbuilder.create(device.get());
VkAccelerationStructureKHR blAccelStructHandle = {};
VkAccelerationStructureCreateInfoKHR createInfo = { VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_CREATE_INFO_KHR };
createInfo.type = VK_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL_KHR;
createInfo.buffer = blAccelStructBuffer->buffer;
createInfo.size = sizeInfo.accelerationStructureSize;
VkResult result = vkCreateAccelerationStructureKHR(device->device, &createInfo, nullptr, &blAccelStructHandle);
if (result != VK_SUCCESS)
throw std::runtime_error("vkCreateAccelerationStructureKHR failed");
blAccelStruct = std::make_unique<VulkanAccelerationStructure>(device.get(), blAccelStructHandle);
BufferBuilder sbuilder;
sbuilder.setUsage(VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT | VK_BUFFER_USAGE_STORAGE_BUFFER_BIT);
sbuilder.setSize(sizeInfo.buildScratchSize);
blScratchBuffer = sbuilder.create(device.get());
info = { VK_STRUCTURE_TYPE_BUFFER_DEVICE_ADDRESS_INFO };
info.buffer = blScratchBuffer->buffer;
VkDeviceAddress scratchAddress = vkGetBufferDeviceAddress(device->device, &info);
buildInfo.dstAccelerationStructure = blAccelStruct->accelstruct;
buildInfo.scratchData.deviceAddress = scratchAddress;
VkAccelerationStructureBuildRangeInfoKHR* rangeInfos[] = { &rangeInfo };
vkCmdBuildAccelerationStructuresKHR(cmdbuffer->buffer, 1, &buildInfo, rangeInfos);
}
void GPURaytracer::CreateTopLevelAccelerationStructure()
{
VkAccelerationStructureDeviceAddressInfoKHR addressInfo = { VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_DEVICE_ADDRESS_INFO_KHR };
addressInfo.accelerationStructure = blAccelStruct->accelstruct;
VkDeviceAddress blAccelStructAddress = vkGetAccelerationStructureDeviceAddressKHR(device->device, &addressInfo);
VkAccelerationStructureInstanceKHR instance = {};
instance.transform.matrix[0][0] = 1.0f;
instance.transform.matrix[1][1] = 1.0f;
instance.transform.matrix[2][2] = 1.0f;
instance.instanceCustomIndex = 0;
instance.accelerationStructureReference = blAccelStructAddress;
instance.flags = VK_GEOMETRY_INSTANCE_TRIANGLE_FACING_CULL_DISABLE_BIT_KHR;
instance.mask = 0xffffffff;
instance.instanceShaderBindingTableRecordOffset = 0;
BufferBuilder tbuilder;
tbuilder.setUsage(VK_BUFFER_USAGE_TRANSFER_SRC_BIT, VMA_MEMORY_USAGE_CPU_ONLY);
tbuilder.setSize(sizeof(VkAccelerationStructureInstanceKHR));
tlTransferBuffer = tbuilder.create(device.get());
auto data = (uint8_t*)tlTransferBuffer->Map(0, sizeof(VkAccelerationStructureInstanceKHR));
memcpy(data, &instance, sizeof(VkAccelerationStructureInstanceKHR));
tlTransferBuffer->Unmap();
BufferBuilder instbufbuilder;
instbufbuilder.setUsage(VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT | VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR | VK_BUFFER_USAGE_TRANSFER_DST_BIT);
instbufbuilder.setSize(sizeof(VkAccelerationStructureInstanceKHR));
tlInstanceBuffer = instbufbuilder.create(device.get());
cmdbuffer->copyBuffer(tlTransferBuffer.get(), tlInstanceBuffer.get());
VkMemoryBarrier barrier = { VK_STRUCTURE_TYPE_MEMORY_BARRIER };
barrier.srcAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT;
barrier.dstAccessMask = VK_ACCESS_ACCELERATION_STRUCTURE_WRITE_BIT_KHR;
vkCmdPipelineBarrier(cmdbuffer->buffer, VK_PIPELINE_STAGE_TRANSFER_BIT, VK_PIPELINE_STAGE_ACCELERATION_STRUCTURE_BUILD_BIT_KHR, 0, 1, &barrier, 0, nullptr, 0, nullptr);
VkBufferDeviceAddressInfo info = { VK_STRUCTURE_TYPE_BUFFER_DEVICE_ADDRESS_INFO };
info.buffer = tlInstanceBuffer->buffer;
VkDeviceAddress instanceBufferAddress = vkGetBufferDeviceAddress(device->device, &info);
VkAccelerationStructureGeometryInstancesDataKHR instances = { VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_INSTANCES_DATA_KHR };
instances.data.deviceAddress = instanceBufferAddress;
VkAccelerationStructureGeometryKHR accelStructTLDesc = { VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_KHR };
accelStructTLDesc.geometryType = VK_GEOMETRY_TYPE_INSTANCES_KHR;
accelStructTLDesc.geometry.instances = instances;
VkAccelerationStructureBuildRangeInfoKHR rangeInfo = {};
rangeInfo.primitiveCount = 1;
VkAccelerationStructureBuildGeometryInfoKHR buildInfo = { VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_GEOMETRY_INFO_KHR };
buildInfo.flags = VK_BUILD_ACCELERATION_STRUCTURE_PREFER_FAST_TRACE_BIT_KHR;
buildInfo.geometryCount = 1;
buildInfo.pGeometries = &accelStructTLDesc;
buildInfo.mode = VK_BUILD_ACCELERATION_STRUCTURE_MODE_BUILD_KHR;
buildInfo.type = VK_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL_KHR;
buildInfo.srcAccelerationStructure = VK_NULL_HANDLE;
uint32_t maxInstanceCount = 1;
VkAccelerationStructureBuildSizesInfoKHR sizeInfo = { VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_BUILD_SIZES_INFO_KHR };
vkGetAccelerationStructureBuildSizesKHR(device->device, VK_ACCELERATION_STRUCTURE_BUILD_TYPE_DEVICE_KHR, &buildInfo, &maxInstanceCount, &sizeInfo);
VkAccelerationStructureKHR tlAccelStructHandle = {};
VkAccelerationStructureCreateInfoKHR createInfo = { VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_CREATE_INFO_KHR };
createInfo.type = VK_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL_KHR;
createInfo.size = sizeInfo.accelerationStructureSize;
VkResult result = vkCreateAccelerationStructureKHR(device->device, &createInfo, nullptr, &tlAccelStructHandle);
if (result != VK_SUCCESS)
throw std::runtime_error("vkCreateAccelerationStructureKHR failed");
tlAccelStruct = std::make_unique<VulkanAccelerationStructure>(device.get(), tlAccelStructHandle);
BufferBuilder sbuilder;
sbuilder.setUsage(VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT | VK_BUFFER_USAGE_STORAGE_BUFFER_BIT);
sbuilder.setSize(sizeInfo.buildScratchSize);
tlScratchBuffer = sbuilder.create(device.get());
info = { VK_STRUCTURE_TYPE_BUFFER_DEVICE_ADDRESS_INFO };
info.buffer = tlScratchBuffer->buffer;
VkDeviceAddress scratchAddress = vkGetBufferDeviceAddress(device->device, &info);
buildInfo.dstAccelerationStructure = tlAccelStruct->accelstruct;
buildInfo.scratchData.deviceAddress = scratchAddress;
VkAccelerationStructureBuildRangeInfoKHR* rangeInfos[] = { &rangeInfo };
vkCmdBuildAccelerationStructuresKHR(cmdbuffer->buffer, 1, &buildInfo, rangeInfos);
}

21
src/lightmap/gpuraytracer.h
View File

@ -2,6 +2,7 @@
#pragma once
#include "vulkandevice.h"
#include "vulkanobjects.h"
class LevelMesh;
@ -14,6 +15,10 @@ public:
void Raytrace(LevelMesh* level);
private:
void CreateVertexAndIndexBuffers();
void CreateBottomLevelAccelerationStructure();
void CreateTopLevelAccelerationStructure();
void RaytraceProbeSample(LightProbeSample* probe);
void RaytraceSurfaceSample(Surface* surface, int x, int y);
Vec3 TracePath(const Vec3& pos, const Vec3& dir, int sampleIndex, int depth = 0);
@ -30,4 +35,20 @@ private:
LevelMesh* mesh = nullptr;
std::unique_ptr<VulkanDevice> device;
std::unique_ptr<VulkanBuffer> vertexBuffer;
std::unique_ptr<VulkanBuffer> indexBuffer;
std::unique_ptr<VulkanBuffer> transferBuffer;
std::unique_ptr<VulkanBuffer> blScratchBuffer;
std::unique_ptr<VulkanBuffer> blAccelStructBuffer;
std::unique_ptr<VulkanAccelerationStructure> blAccelStruct;
std::unique_ptr<VulkanBuffer> tlTransferBuffer;
std::unique_ptr<VulkanBuffer> tlScratchBuffer;
std::unique_ptr<VulkanBuffer> tlInstanceBuffer;
std::unique_ptr<VulkanAccelerationStructure> tlAccelStruct;
std::unique_ptr<VulkanCommandPool> cmdpool;
std::unique_ptr<VulkanCommandBuffer> cmdbuffer;
};