[Bug 91114] ES3-CTS.gtf.GL3Tests.shadow.shadow_execution_vert fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91114

--- Comment #20 from Kevin Rogovin <kevin.rogovin at intel.com> ---
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

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