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buffered TLAS

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This commit is contained in:
Jorijn van der Graaf 2026-01-29 19:46:53 +01:00
commit 642cef78b1
4 changed files with 23 additions and 64 deletions
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18
implementations/Crafter.Graphics-RenderingElement3DVulkan.cpp
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@ -52,19 +52,19 @@ RenderingElement3DVulkan::RenderingElement3DVulkan(Mesh& mesh) {
};
}
void RenderingElement3DVulkan::BuildTLAS(VkCommandBuffer cmd) {
instanceBuffer.Resize(VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT | VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, elements.size());
void RenderingElement3DVulkan::BuildTLAS(VkCommandBuffer cmd, std::uint32_t index) {
tlases[index].instanceBuffer.Resize(VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT | VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, elements.size());
for(std::uint32_t i = 0; i < elements.size(); i++) {
instanceBuffer.value[i] = elements[i].instance;
tlases[index].instanceBuffer.value[i] = elements[i].instance;
}
instanceBuffer.FlushDevice(cmd, VK_ACCESS_MEMORY_READ_BIT, VK_PIPELINE_STAGE_ACCELERATION_STRUCTURE_BUILD_BIT_KHR);
tlases[index].instanceBuffer.FlushDevice(cmd, VK_ACCESS_MEMORY_READ_BIT, VK_PIPELINE_STAGE_ACCELERATION_STRUCTURE_BUILD_BIT_KHR);
VkAccelerationStructureGeometryInstancesDataKHR instancesData = VkAccelerationStructureGeometryInstancesDataKHR {
.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_INSTANCES_DATA_KHR,
.arrayOfPointers = VK_FALSE,
.data = {instanceBuffer.address}
.data = {tlases[index].instanceBuffer.address}
};
VkAccelerationStructureGeometryDataKHR geometryData;
@ -101,19 +101,19 @@ void RenderingElement3DVulkan::BuildTLAS(VkCommandBuffer cmd) {
scratchBuffer.Resize(VK_BUFFER_USAGE_STORAGE_BUFFER_BIT | VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, tlasBuildSizes.buildScratchSize);
tlasBuildGeometryInfo.scratchData.deviceAddress = scratchBuffer.address;
tlasBuffer.Resize(VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_STORAGE_BIT_KHR | VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT | VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, tlasBuildSizes.accelerationStructureSize);
tlases[index].buffer.Resize(VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_STORAGE_BIT_KHR | VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT | VK_BUFFER_USAGE_ACCELERATION_STRUCTURE_BUILD_INPUT_READ_ONLY_BIT_KHR, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, tlasBuildSizes.accelerationStructureSize);
// Create and store the TLAS handle
VkAccelerationStructureCreateInfoKHR tlasCreateInfo {
.sType = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_CREATE_INFO_KHR,
.buffer = tlasBuffer.buffer,
.buffer = tlases[index].buffer.buffer,
.offset = 0,
.size = tlasBuildSizes.accelerationStructureSize,
.type = VK_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL_KHR,
};
VulkanDevice::CheckVkResult(VulkanDevice::vkCreateAccelerationStructureKHR(VulkanDevice::device, &tlasCreateInfo, nullptr, &accelerationStructure));
tlasBuildGeometryInfo.dstAccelerationStructure = accelerationStructure;
VulkanDevice::CheckVkResult(VulkanDevice::vkCreateAccelerationStructureKHR(VulkanDevice::device, &tlasCreateInfo, nullptr, &tlases[index].accelerationStructure));
tlasBuildGeometryInfo.dstAccelerationStructure = tlases[index].accelerationStructure;
// Prepare the build range for the TLAS
VkAccelerationStructureBuildRangeInfoKHR tlasRangeInfo {