[WGSL] Enable semantic related tests that work already for Metal

[jkwak-work]

The following tests are tests that are related to the semantics.
They are currently enabled for Metal and we should enable them for WGSL as well.

• tests/compute/compile-time-loop.slang
• tests/compute/constexpr.slang
• tests/compute/discard-stmt.slang
• tests/compute/texture-sampling.slang
• tests/metal/atomic-intrinsics.slang
• tests/metal/nested-struct-fragment-input.slang
• tests/metal/nested-struct-fragment-output.slang
• tests/metal/nested-struct-multi-entry-point-vertex.slang
• tests/metal/no-struct-vertex-output.slang
• tests/metal/stage-in-2.slang
• tests/metal/sv_target-complex-1.slang
• tests/metal/sv_target-complex-2.slang

[jkwak-work]

There are two PRs related to those tests and those tests still cannot be enabled yet.

• Legalize the Entry-point for WGSL #5498
• Fix the WGSL error about semantic when a nested struct is inlined #5506

The error message looks to be that the issue is on the Slang-RHI side.

WGPU error: Buffer usages (BufferUsage::(MapWrite|CopySrc|CopyDst)) is invalid. If a buffer usage contains BufferUsage::MapWrite the only other allowed usage is BufferUsage::CopySrc.

Here is how to reproduce the error,

$ build/Release/bin/slang-test.exe tests/compute/compile-time-loop.slang
Supported backends: fxc dxc glslang spirv-dis clang visualstudio genericcpp nvrtc llvm spirv-opt metal tint
Check vk,vulkan: Supported
Check dx12,d3d12: Supported
Check dx11,d3d11: Supported
Check cuda: Supported
Check wgpu,webgpu: Supported
passed test: 'tests/compute/compile-time-loop.slang (dx11)'
ignored test: 'tests/compute/compile-time-loop.slang.1 (mtl)'
WGPU error: Buffer usages (BufferUsage::(MapWrite|CopySrc|CopyDst)) is invalid. If a buffer usage contains BufferUsage::MapWrite the only other allowed usage is BufferUsage::CopySrc.
 - While calling [Device].CreateBuffer([BufferDescriptor]).

WGPU error: [Invalid Buffer (unlabeled)] is invalid.
 - While calling [Queue].WriteBuffer([Invalid Buffer (unlabeled)], (0 bytes), data, (96 bytes))

Warning: Old OnSubmittedWorkDone APIs are deprecated. If using C please pass a CallbackInfo struct that has two userdatas. Otherwise, if using C++, please use templated helpers.
WGPU error: [Invalid Buffer (unlabeled)] is invalid.
 - While encoding [RenderPassEncoder (unlabeled)].SetVertexBuffer(0, [Invalid Buffer (unlabeled)], 0, 96).
 - While finishing [CommandEncoder (unlabeled)].

WGPU error: [Invalid CommandBuffer] is invalid.
 - While calling [Queue].Submit([[Invalid CommandBuffer]])

Warning: Old MapAsync APIs are deprecated. If using C please pass a CallbackInfo struct that has two userdatas. Otherwise, if using C++, please use templated helpers.
error: ERROR:
EXPECTED{{{
40A00000
}}}
ACTUAL{{{
0
}}}

ignored test: 'tests/compute/compile-time-loop.slang.2 syn (wgpu)'
passed test: 'tests/compute/compile-time-loop.slang.3 syn (dx12)'
Retrying 1 failed tests...
WGPU error: Buffer usages (BufferUsage::(MapWrite|CopySrc|CopyDst)) is invalid. If a buffer usage contains BufferUsage::MapWrite the only other allowed usage is BufferUsage::CopySrc.
 - While calling [Device].CreateBuffer([BufferDescriptor]).

WGPU error: [Invalid Buffer (unlabeled)] is invalid.
 - While calling [Queue].WriteBuffer([Invalid Buffer (unlabeled)], (0 bytes), data, (96 bytes))

Warning: Old OnSubmittedWorkDone APIs are deprecated. If using C please pass a CallbackInfo struct that has two userdatas. Otherwise, if using C++, please use templated helpers.
WGPU error: [Invalid Buffer (unlabeled)] is invalid.
 - While encoding [RenderPassEncoder (unlabeled)].SetVertexBuffer(0, [Invalid Buffer (unlabeled)], 0, 96).
 - While finishing [CommandEncoder (unlabeled)].

WGPU error: [Invalid CommandBuffer] is invalid.
 - While calling [Queue].Submit([[Invalid CommandBuffer]])

Warning: Old MapAsync APIs are deprecated. If using C please pass a CallbackInfo struct that has two userdatas. Otherwise, if using C++, please use templated helpers.
error: ERROR:
EXPECTED{{{
40A00000
}}}
ACTUAL{{{
0
}}}

FAILED test: 'tests/compute/compile-time-loop.slang.2 syn (wgpu)'

===
66% of tests passed (2/3), 2 tests ignored
===

failing tests:
---
tests/compute/compile-time-loop.slang.2 syn (wgpu)
---

[jkwak-work]

These tests need to be enabled after #4943 is resolved.
Pushing the issue to the next sprint.

[aleino-nv]

All of the mentioned tests from tests/compute should already be passing or not in scope.

The tests/compute/texture-sampling.slang test is not in scope, but I created tests/compute/texture-sampling-no-1d-arrays.slang which now works.

[jkwak-work]

I like to share some update.

The following four tests are working as of today:

• tests/compute/compile-time-loop.slang
• tests/compute/constexpr.slang
• tests/compute/discard-stmt.slang
• tests/compute/texture-sampling.slang

"tests/metal/atomic-intrinsics.slang" is not supported for WGSL because InterlockedXXX functions are not available for WGSL.
When attempted, the capacity system prints error messages saying that WGSL doesn't support InterlockedXXX functions.

tests/metal/nested-struct-fragment-input.slang and ests/metal/nested-struct-fragment-output.slang generates valid WGSL when tested with the shader-playground. But I need to enable it as a part of slang-test test.

I will check the rest of tests later.