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* SPIRV `Block` decoration fixes.
- SPIRV does not allow duplicate `Block` decorations. So we shouldn't be generating them.
- Also fixes duplication of OpName.
- SPIRV and HLSL do not allow ConstantBuffer with trailing unsized arrays. Added a check in the front-end against such code.
* Convert failing cross-compile tests to filecheck.
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Co-authored-by: Jay Kwak <82421531+jkwak-work@users.noreply.github.com>
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* [SPIRV] fix code gen for `SV_Coverage`.
* Fix #3714, #3699.
* Fix.
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There were two overlapping issues here:
1. We always mapped `SV_Coverage` to `gl_SampleMask`, even though `gl_SampleMaskIn` is the correct built-in variable to use for an input varying.
2. We treated `gl_SampleMask` like it was a scalar shader input, when it and `gl_SampleMaskIn` are actually arrays of indeterminate size (as a byproduct of trying to future-proof for implementations that might support hundreds or thousands of samples per pixel...)
The fix here is simple: map to either `gl_SampleMask[0]` or `gl_SampleMaskIn[0]` as appropriate. I suppose that this approach doesn't handle the possibility of eventually supporting >32 samples per pixel by having something like `uint2 coverage : SV_Coverage`, but I think we can cross that bridge when we come to it.
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