https://bugs.freedesktop.org/show_bug.cgi?id=94341
--- Comment #1 from Brian Paul <bri...@vmware.com> ---
Are you using the old "swrast" driver? If so, the derivative functions only
work correctly for some values (the interpolated texcoords, colors, etc.).
If you can switch to the llvmpipe driver you shouldn't have that problem (and
your code should run faster).
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