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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - ES3-CTS.gtf.GL3Tests.shadow.shadow_execution_vert fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91114#c20">Comment # 20</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - ES3-CTS.gtf.GL3Tests.shadow.shadow_execution_vert fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91114">bug 91114</a>
from <span class="vcard"><a class="email" href="mailto:kevin.rogovin@intel.com" title="Kevin Rogovin <kevin.rogovin@intel.com>"> <span class="fn">Kevin Rogovin</span></a>
</span></b>
<pre>Correction
Currently for textureGrad, i965 does this (taking into account the -1):
rho = 0.5 * L * max( |grad s|, |grad t|, |grad r|)
where |grad A | is sqrt(dot(A,A)).
Sadly that could be optimized to skip the sqrt and do the sqrt "after" the log2
changing it into a multiply by 0.5.
Anyways it is utterly wrong for textureGrad on cubemaps.
-Kevin</pre>
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