https://bugs.freedesktop.org/show_bug.cgi?id=78648
Priority: medium
Bug ID: 78648
Assignee: idr at freedesktop.org
Summary: Texture artifacts in Kerbal Space Program
QA Contact: intel-3d-bugs at lists.freedesktop.org
Severity: normal
Classification: Unclassified
OS: All
Reporter: lemody at gmail.com
Hardware: Other
Status: NEW
Version: git
Component: Drivers/DRI/i965
Product: Mesa
With Mesa master there are strange flickering 'rectangles' in the terrain
texture when watching the planet from sky in kerbal space program. This is a
regression, used to look fine before.
I've bisected the regression in to following commit:
--- 8< ---
42a26cb5e441a01d5288b299980f23affaad53fe is the first bad commit
commit 42a26cb5e441a01d5288b299980f23affaad53fe
Author: Matt Turner <mattst88 at gmail.com>
Date: Wed Apr 9 13:38:14 2014 -0700
i965: Don't make instructions with a null dest a barrier to scheduling.
Now that we properly track accumulator dependencies, the scheduler is
able to schedule instructions between the mach and mov in the common
the integer multiplication pattern:
mul acc0, x, y
mach null, x, y
mov dest, acc0
Since a null destination implies no dependency on the destination, we
can also safely schedule instructions (that don't write the accumulator)
between the mul and mach.
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
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