i965: fix textureGrad for cubemaps
Fixes bugs exposed by commit
2b1cdb0eddb73f62e4848d4b64840067f1f70865 in:
ES3-CTS.gtf.GL3Tests.shadow.shadow_execution_frag
No regressions observed in deqp, CTS or Piglit.
v2: address review feedback from Iago Toral:
- move rho calculation to else branch
- optimize dx and dy calculation
- fix documentation inconsistensies
Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Signed-off-by: Kevin Rogovin <kevin.rogovin@intel.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91114
Cc: "10.6 11.0" <mesa-stable@lists.freedesktop.org>
(cherry picked from commit
7f8815bcb9af9b4b374ad7bd6e7cfa7529a6c980)
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