CmdCompactBLAS()

void Spices::VulkanRayTracing::CmdCompactBLAS ( VkCommandBuffer cmdBuf, const std::vector< uint32_t > & indices, std::vector< BuildAccelerationStructure > & buildAs, std::shared_ptr< VulkanQueryPool > queryPool ) const

private

Create and replace a new acceleration structure and buffer based on the size retrieved by the Query. We have to wait until all BLAS are built, to make a copy in the more suitable memory space. This is the reason why we used m_cmdPool.submitAndWait(cmdBuf) before calling this function.

Parameters

[in]	cmdBuf	VkCommandBuffer.
[in]	indices	BLAS indices.
[in]	buildAs	BuildAccelerationStructure.
[in]	queryPool	Query AccelerationStructure data.

Get the compacted size result back.

Get Query Pool results.

Creating a compact version of the AS.

Copy the original BLAS to a compact version.

Get the compacted size result back.

Get Query Pool results.

Creating a compact version of the AS.

Copy the original BLAS to a compact version.

Definition at line 557 of file VulkanRayTracing.cpp.

    {
        SPICES_PROFILE_ZONE;
 
        uint32_t queryCtn = 0;
 
        std::vector<VkDeviceSize> compactSizes(static_cast<uint32_t>(indices.size()));
 
        queryPool->QueryResults(compactSizes.data());
 
        for (const auto idx : indices)
        {
            buildAs[idx].cleanupAS                          = *buildAs[idx].as;             // previous AS to destroy
            buildAs[idx].sizeInfo.accelerationStructureSize = compactSizes[queryCtn++];     // new reduced size
 
            VkAccelerationStructureCreateInfoKHR              asCreateInfo{};
            asCreateInfo.sType                              = VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_CREATE_INFO_KHR;
            asCreateInfo.size                               = buildAs[idx].sizeInfo.accelerationStructureSize;
            asCreateInfo.type                               = VK_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL_KHR;
            *buildAs[idx].as                                = CreateAcceleration(asCreateInfo);
 
            VkCopyAccelerationStructureInfoKHR                copyInfo{};
            copyInfo.sType                                  = VK_STRUCTURE_TYPE_COPY_ACCELERATION_STRUCTURE_INFO_KHR;
            copyInfo.src                                    = buildAs[idx].buildInfo.dstAccelerationStructure;
            copyInfo.dst                                    = buildAs[idx].as->accel->Get();
            copyInfo.mode                                   = VK_COPY_ACCELERATION_STRUCTURE_MODE_COMPACT_KHR;
 
            m_VulkanState.m_VkFunc.vkCmdCopyAccelerationStructureKHR(cmdBuf, &copyInfo);
        }
    }