WGSL: Aim for getting all GFX tests to pass

[aleino-nv]

No description provided.

[jkwak-work]

The plan is to try to get tests/render/cross-compile-entry-point.slang working for WGSL and see what comes out next.

[jkwak-work]

After spending some time understanding how tests/render/cross-compile-entry-point.slang works, here is how I understood this issue.

There are four slang-test "test-types" related to "rendering"; the full list of "test-types" can be found here.:

• COMPARE_HLSL_RENDER
• COMPARE_HLSL_CROSS_COMPILE_RENDER
• COMPARE_HLSL_GLSL_RENDER
• COMPARE_RENDER_COMPUTE

Because this task is limited to "all GFX tests", "COMPARE_RENDER_COMPUTE" isn't relevant.

There are only 7 tests that use one of the three test-types:

tests/bugs/texture2d-gather.hlsl
tests/render/cross-compile-entry-point.slang // currently disabled
tests/render/nointerpolation.hlsl // currently disabled
tests/render/render0.hlsl // currently disabled
tests/render/cross-compile0.hlsl // currently disabled
tests/render/imported-parameters.hlsl // currently disabled
tests/render/unused-discard.hlsl // currently disabled

The goal of this task will be to make those tests working for WGSL.

For the disabled tests, we will need to re-evaluate if they should be re-enabled.
If enabled, they will also need to work for WGSL.
As an example, "tests/render/cross-compile-entry-point.slang" can be simply re-enabled by changing the test-type from COMPARE_HLSL_CROSS_COMPILE_RENDER to COMPARE_HLSL_RENDER.

When the task is completed, we should have a following line on those rendering tests,

//TEST:COMPARE_HLSL_RENDER:-wgpu

It will generate two PNG image files: one with HLSL/DXC and another with WGSL/DAWN.
slang-test will compare the images and check if they are identical.

[csyonghe]

COMPARE_RENDER_COMPUTE is actually relevant, it is a vertex-fragment pipeline that writes results into a buffer instead of a framebuffer, and reads back the buffer values for comparison, so that test is a vertex-fragment shader test.

[jkwak-work]

I see.
Thanks for the information.

For COMPARE_RENDER_COMPUTE, there are six tests that use the test-type:

./compute/compile-time-loop.slang
./compute/discard-stmt.slang
./compute/global-type-param-in-entrypoint.slang // currently disabled
./compute/texture-sample-grad-offset-clamp.slang
./compute/texture-sampling.slang
./compute/type-param-varying.slang // currently disabled

[jkwak-work]

It appears that a big portion of the implementation for this task is already done in PR 5174.