[pull] main from gpuweb:main #247
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This turned into a bigger change than just fixing the typo. With the typo fixed, a bunch of tests started failing. One issue in particular is that out of bounds `textureLoad` needs to take swizzle into account since its allowed to return any value inside the texture. I'm making the assuption that the spec would say it can return any swizzled value in the texture. This comes up with depth textures because if texture-component-swizzle is enabled then we check RGBA for depth textures instead of just R and we expcet GBA to be 001. Before this change, if the texel address was invalid we'd get a texel from the software texture and GBA would be wrong and so no texels would match. Theoretically, with this change, the software sampler code supports swizzles but, that path is not really be exercised. Only the fact that depth textures go from R??? to R001 is used.
`dpdxFine`, `dpdyFine`, and `fwidthFine` are not supported in compatibility mode.
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