[Nouveau] [Bug 91551] DXTn compressed normal maps produce severe artifacts on all NV5x and NVDx chipsets

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91551

--- Comment #9 from Ilia Mirkin <imirkin at alum.mit.edu> ---
As I suspected, nothing to do with compressed textures. Should be at least
partially fixed by

commit ce28ca713364dbe83cb3c371ca034bc2c2947616
Author: Ilia Mirkin <imirkin at alum.mit.edu>
Date:   Thu Sep 10 03:55:06 2015 -0400

    nv50/ir: fix emission of 8-byte wide interp instruction

    This can come up if the target register number is > 63, which is fairly
    rare.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91551
    Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
    Cc: "11.0" <mesa-stable at lists.freedesktop.org>

It still doesn't seem to render quite the same as nvc0 and llvmpipe. The
lighting on the back of the spinning models is much brighter. Not sure why...
those shaders are ENORMOUS by the way.

I thought it might be due to glShadeModel(GL_FLAT) at first, which isn't
properly handled, but that's not it -- it only ever calls
glShadeModel(GL_SMOOTH) in the trace.

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