WebGPU: Tests asserting in tests/compute

[aleino-nv]

The following tests are currently asserting for wgpu and are therefore disabled for this API.
This task is about triaging these issues -- either fix on the spot or file a more detailed task.

1. tests/compute/atomics-buffer.slang
2. tests/compute/atomics-groupshared.slang
3. tests/compute/atomics.slang
4. tests/compute/buffer-type-splitting.slang
5. tests/compute/byte-address-buffer.slang
6. tests/compute/column-major.slang
7. tests/compute/constant-buffer-memory-packing.slang
8. tests/compute/func-cbuffer-param.slang
9. tests/compute/parameter-block.slang
10. tests/compute/texture-get-dimensions.slang
11. tests/compute/texture-sampling.slang
12. tests/compute/texture-simple.slang
13. tests/compute/texture-simpler.slang
14. tests/compute/transcendental-double.slang

[aleino-nv]

It turns out that the asserts are a bit spurious in the sense that they just mean "something went wrong" rather than being checks that the internal logic of slang-test is ok.

These failures boil down to these 6 categories:

1. Capabilities: using of 'InterlockedAdd'
   • Tests:
     1. atomics-buffer
     2. atomics-groupshared
     3. atomics
   • Example output:

tests/compute/atomics.slang(23): error 36107: entrypoint 'computeMain' does not support compilation target 'wgsl' with stage 'compute'
tests/compute/atomics.slang(17): note: see using of 'InterlockedAdd'

2. Capabilities: using of 'Load'
   • Tests:
     1. buffer-type-splitting
     2. byte-address-buffer
   • Example output:

tests/compute/byte-address-buffer.slang(35): error 36107: entrypoint 'computeMain' does not support compilation target 'wgsl' with stage 'compute'
tests/compute/byte-address-buffer.slang(23): note: see using of 'Load'

3. WebGPU error: Binding doesn't exist
   • Tests:
     1. column-major
     2. constant-buffer-memory-packing
     3. func-cbuffer-param
     4. parameter-block
4. WebGPU error: unresolved type 'texture_1d_array'
   • Tests:
     1. texture-get-dimensions
     2. texture-sampling
     3. texture-simple
   • Example output:

WGPU error: Error while parsing WGSL: :11:40 error: unresolved type 'texture_1d_array'

5. Slang: unknown system-value semantic 'sv_groupindex'
   • Tests:
     1. texture-simpler
   • Example output:

tests/compute/texture-simpler.slang(18): error 40006: unknown system-value semantic 'sv_groupindex'

6. Slang: unexpected: 'double' type emitted (WGSL emitter)
   • Tests:
     1. transcendental-double
   • Example output:

unexpected: 'double' type emitted

[aleino-nv]

I think 5 and 6 already have known issues. (I should add links to those issues where I disable the tests though.)
I will file issues to track any remaining issues that don't already have known related issues.

[aleino-nv]

I've split this issue into a few different tasks, after some initial investigation:

1. Split into new issue WGSL: Missing capability for InterlockedAdd #5220
2. Split into new issue WGSL: Missing capability for ByteAddressBuffer::Load #5221
3. Split into new issue slang-RHI/WebGPU: Binding missing from bind group layout #5222
4. Split into new issue WGSL: There is no texture_1d_array type in WGSL #5223
5. Will be addressed by existing task WGSL: System semantics #4940
6. Will be addressed by existing task Extend capability system to detect unsupported numerical types #4947