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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Incorrect results with dFdx / dFdy"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94341#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Incorrect results with dFdx / dFdy"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94341">bug 94341</a>
from <span class="vcard"><a class="email" href="mailto:brianp@vmware.com" title="Brian Paul <brianp@vmware.com>"> <span class="fn">Brian Paul</span></a>
</span></b>
<pre>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).</pre>
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