Commits on Oct 15, 2024

1. Make identifySamplePoints handle compare …

   identifySamplePoints works by doing a binary search
   filling a texture with black (0,0,0,0) and white (1,1,1,1)
   texels and then sampling it. Any non-zero results means
   those white pixels were sampled.
   
   This doesn't work for comparisons like textureSampleCompare,
   textureSampleCompareLevel, and textureGatherCompare because
   the result of those are 0 or 1 so for example, of the comparison
   is 'always' then all texels will show up as sampled.
   
   So, instead, if the builtin being tested is a comparison
   we convert the call to the corresponding non-comparsion builtin.
   
   * textureSampleCompare -> textureSample
   * textureSampleCompareLevel -> textureSampleLevel
   * textureGatherCompare -> textureGather
   
   This lets us find the sample points as best we can (it assumes
   those functions sample the same texels).
   
   Once we have the sample point we then want to look up the actual
   values of the texels and print them out. To do this requires
   reading the texture back from the GPU. We made the texture ourselves
   so we could maybe theoretically pass the data we sent to the GPU
   down to identifySamplePoints but it seems good to get the values
   from the GPU itself so at least they made a round trip through the
   GPU
   
   When, if it's a comparison, we print out the result of each
   comparison with that texel. Hopefully this will help us identify
   why these tests don't pass on some devices.

   

   greggman committed Oct 15, 2024
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