[Webkit-unassigned] [Bug 256724] New: [WebGPU][WGSL] sampling a texture_external should expand to two samples

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=256724

            Bug ID: 256724
           Summary: [WebGPU][WGSL] sampling a texture_external should
                    expand to two samples
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGPU
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mwyrzykowski at apple.com

In WGSL if we have:

  texture_external t;
  vec4<f32> result = textureSampleBaseClampToEdge(t, sampler, normalizedCoordinates);

or:

  texture_external t;
  vec4<f32> result = textureLoad(t, pixelCoordinates, levelOfDetail);


we should expand this to:

    auto coords = t_UVRemapMatrix * normalizedCoordinates;
    auto y = t_FirstPlane.sample(sampler, coords).r;
    auto cbcr = t_SecondPlane.sample(sampler, coords).rg;
    auto ycbcr = float3(y, cbcr);
    float4 result = float4(t_ColorSpaceConversionMatrix * float4(ycbcr, 1), 1);


or:

    auto coords = t_UVRemapMatrix * pixelCoordinates;
    auto y = t_FirstPlane.read(coords, levelOfDetail).r;
    auto cbcr = t_SecondPlane.read(sampler, levelOfDetail).rg;
    auto ycbcr = float3(y, cbcr);
    float4 result = float4(t_ColorSpaceConversionMatrix * float4(ycbcr, 1), 1);

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