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D3D11 is pretty strict about how to do centroid interpolation. In particular, llvmpipe didn't honor these rules when no sample was covered for a pixel (relevant for helper pixels), in this case llvmpipe selected the position of the sample with the highest index (just due to initialization, not really by choice). Given that helper pixels are only really used for derivative calculations, and derivatives are generally sketchy with centroid interpolation, this seems quite a lot of work, but I suppose it could be useful if the state sample mask has only 1 sample set (since these d3d11 rules then guarantee that even with centroid the derivatives are actually useful as the interpolation will be done at the position defined by the sample specified in the sample mask, regardless if that sample is covered by the primitive or not). Other APIs might technically not need this (they tend to not even define at which position centroid interpolation is done, other than it must be inside the primitive), but it shouldn't really hurt them neither. Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38664>
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