[Bug 26043] New: Graphics corruption in Sauerbraten

[bugzilla-daemon@freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=26043

           Summary: Graphics corruption in Sauerbraten
           Product: Mesa
           Version: git
          Platform: x86-64 (AMD64)
               URL: http://jon.severinsson.net/mesa/screenshot_10399.png
        OS/Version: Linux (All)
            Status: NEW
          Keywords: patch, regression
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/R600
        AssignedTo: dri-devel@lists.sourceforge.net
        ReportedBy: jon@severinsson.net


Created an attachment (id=32638)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=32638)
Uggly patch that fixes the problem for me

After upgrading from Mesa 7.6.1 to Mesa 7.7 Sauerbraten would display severe
graphics corruptions on screen making the game unplayable (see URL for a
screenshot).

I recently had some time to spare and decided to try to hunt down the
regression as an exercise in learning git, and managed to create the attached
patch that solves the problem for me.

Please note that the patch isn't really a fix, more of a workaround, as it
replaces 96 lines of new code with 206 lines of old code from the git history,
rather than fixing the new code, but it works for me, and perhaps it can serve
as a starting point for someone more knowledgeable to fix it for real.

The patch was originally created by going through git history between
mesa_7_6_1 and mesa_7_7 looking for commits that broke something, and merging
everything but those commits to a new tree. The commits I skipped was eea30906
614e8f22 fc38a3cf 45eb9d2f 5f7d5d3e 57864f6e 731810f8 and 66d6f9e8. I also had
to do some manual conflict resolution when merging other commits. I then took
the difference between mesa_7_7 and the new tree to create a patch that fixed
Sauerbraten. Finally I cleaned up the patch and removed anything that wasn't
necessary to get Sauerbraten working, giving me the attached patch.

`lspci -v` output for my card:
01:00.0 VGA compatible controller: ATI Technologies Inc RV630 [Radeon HD 2600
Series] (prog-if 00 [VGA controller])
        Subsystem: ASUSTeK Computer Inc. Device 01bc
        Flags: bus master, fast devsel, latency 0, IRQ 18
        Memory at d0000000 (64-bit, prefetchable) [size=256M]
        Memory at fdfe0000 (64-bit, non-prefetchable) [size=64K]
        I/O ports at ee00 [size=256]
        [virtual] Expansion ROM at fdf00000 [disabled] [size=128K]
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit+
        Capabilities: [100] Vendor Specific Information <?>
        Kernel driver in use: radeon


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