[SPIR-V] Add descriptor heap RaytracingAccelerationStructure support#8518
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[SPIR-V] Add descriptor heap RaytracingAccelerationStructure support#8518jzakharovnv wants to merge 2 commits into
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Building off of microsoft#8281, this commit adds a native lowering via SPV_EXT_descriptor_heap and SPV_KHR_untyped_pointers. ResourceDescriptorHeap and SamplerDescriptorHeap are lowered to untyped variables decorated with ResourceHeapEXT and SamplerHeapEXT. Each heap access emits OpUntypedAccessChainKHR into a runtime array of the appropriate descriptor type. Buffer-like resources (StructuredBuffer, ByteAddressBuffer, ConstantBuffer, TextureBuffer) use OpTypeBufferEXT and OpBufferPointerEXT; image and sampler resources use OpLoad. Interlocked operations on RWTexture use OpUntypedImageTexelPointerEXT. Requires -fspv-target-env=vulkan1.3. Assisted-by: Claude.
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Extends the SPV_EXT_descriptor_heap native heap lowering to cover RaytracingAccelerationStructure resources loaded from ResourceDescriptorHeap. Acceleration structure descriptors are accessed via OpUntypedAccessChainKHR into a runtime array of OpTypeAccelerationStructureKHR, consistent with the image and sampler paths added in the previous commit.
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Building off of #8517, this PR extends the SPV_EXT_descriptor_heap native heap lowering to cover RaytracingAccelerationStructure resources loaded from ResourceDescriptorHeap. It is part 2/4 in a series.
Acceleration structure descriptors are accessed via OpUntypedAccessChainKHR into a runtime array of OpTypeAccelerationStructureKHR, consistent with the image and sampler paths added in the previous commit.
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