https://bugs.freedesktop.org/show_bug.cgi?id=64323
Priority: medium
Bug ID: 64323
Assignee: [email protected]
Summary: Severe misrendering in Left 4 Dead 2
Severity: normal
Classification: Unclassified
OS: Linux (All)
Reporter: [email protected]
Hardware: x86 (IA32)
Status: NEW
Version: git
Component: Drivers/DRI/nouveau
Product: Mesa
This should be filed under component "Drivers/Gallium/nouveau", but that
doesn't exist for some reason.
In the nv50 driver, after loading a map in the Left 4 Dead 2 beta, there are
major rendering artifacts that make the game unplayable. Portal shows a
similar problem.
Noticing that stable versions before Mesa 9.1 don't have this problem, I
bisected the regression to this commit:
http://cgit.freedesktop.org/mesa/mesa/commit/?h=48a45ec24ae74c0
commit 48a45ec24ae74c00d1487552e94d9f824a428f58
Author: Christoph Bumiller <[email protected]>
Date: Tue Jan 8 16:13:11 2013 +0100
nouveau: improve buffer transfers
Save double memcpy on uploads to VRAM in most cases.
Properly handle FLUSH_EXPLICIT.
Reallocate on DISCARD_WHOLE_RESOURCE to avoid sync.
I don't understand the changes made by this commit well enough to fix the
regression myself. I have an apitrace that can be used to reproduce the issue,
and will comment on this bug with a link to it as soon as I find a good way to
share large (~512 MB) files online.
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