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Treat DescriptorHandle as uint64_t instead of uint2. Implement
target-specific SPIR-V emission with the bindless texture support.
For OpImageTexelPointer, Image must have a type of OpTypePointer with
Type OpTypeImage. Fix the issue by using [constref] in __subscript.
Add a test coverage for various texture/sampler handle types.
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Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>
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Related to
- https://github.com/shader-slang/slang/issues/8519
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* change default descriptor binding to be VkMutable
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Fix correct bindings for bindless resource model [spirv and glsl]
fixes: #6952
Problem:
* Currently all bindless objects are placed in the same set (fine) and same binding (incorrect behavior for vulkan). This is incorrect since as per [spec](https://registry.khronos.org/vulkan/specs/latest/man/html/VkDescriptorType.html), only 1 resource type may be written to each index inside a set (these rules are loosened with VK_EXT_mutable_descriptor_type)
* This means currently generated bindings do not work in practice if we (for example) use `Sampler2D.Handle` and `Texture1D.Handle` in a shader since we would place 2 incompatible objects in the same binding-index and set.
Solution:
* `__getDynamicResourceHeap` was modified to allow bindings to chosen dynamically for a descriptor
* use `IOpaqueDescriptor` to check compile-time information of resource types so that we can identify different resources
* Using this information of `IOpaqueDescriptor`, we modify `defaultGetDescriptorFromHandle` to provide a binding model (1 resource per binding-index) which produces legal spirv/glsl.
* To support `VK_EXT_mutable_descriptor_type` the function `defaultGetDescriptorFromHandle` has a set of options (`BindlessDescriptorOptions`) for a user to pick-from to support their binding model. Capabilities are not used here for flexibility purposes (specifically old shaders mixed with modern vulkan extensions).
Other changes:
* Added `TexelBuffer` DescriptorKind to aid in generating correct bindings
* format code
* Add to docs bindless changes, make AccelerationStructure use its handle directly, adjust tests accordingly
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Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>
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* Add `IOpaqueHandle::descriptorAccess`.
* Update doc.
* fix.
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* Initial implementation of `ResourcePtr<T>`.
* Update docs
* Fix build error.
* Add more discussion.
* Update documentation.
* Update TOC.
* Fix.
* Fix.
* Add test case for custom `getResourceFromBindlessHandle`.
* Add namehint to generated descriptor heap param.
* Fix.
* Fix.
* format code
* Rename to `DescriptorHandle`, and add `T.Handle` alias.
* Fix compiler error.
* Fix.
* Fix build.
* Renames.
* Fix documentation.
* Documentation fix.
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Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>
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