Cassandra Beckley

While investigating #4444, I found that the following HLSL causes a compiler crash: ```HLSL RWTexture3D g_rwTexture3d; [numthreads(256, 1, 1)] void main() { RWTexture3D voxels = g_rwTexture3d; InterlockedAdd(voxels[uint3(1,2,3)], 1, 0); }...

[SPIR-V] Add error for casting from vector to scalar

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Fixes #4640

Cannot use `select` intrinsic with SamplerState

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The [blog post announcing logical operator short circuiting](https://devblogs.microsoft.com/directx/announcing-hlsl-2021/#logical-operator-short-circuiting) seems to suggest that the new `select` intrinsic should behave the same as the ternary operator used to prior to HLSL 2021....

[SPIR-V] Support arrays of RWStructuredBuffers

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I'm not confident this generates the correct code in all cases, so I'd appreciate it if there are any suggestions. Fixes #3281

Implements hlsl-specs proposal 0011, adding `vk::SpirvType` and `vk::SpirvOpaqueType` templates which allow users to define and use SPIR-V level types.

In order to load `.glb` format files, we will need to be able to create textures from a buffer, rather than a file.

[SPIR-V] Fix bug using `Texture2D` with alias template for `SpirvType`

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**Description** For the (currently unmerged) `SpirvType` PR, `Texture2D` (and presumably other built-in types) cannot be used as an argument to an alias template for `SpirvType` **Steps to Reproduce** Compile ```hlsl...