[Bug 36099] New: Vertex distortion bug in the game Xonotic

[Bug 36099] New: Vertex distortion bug in the game Xonotic

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https://bugs.freedesktop.org/show_bug.cgi?id=36099

           Summary: Vertex distortion bug in the game Xonotic
           Product: Mesa
           Version: 7.10
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r300
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: vand2@gmx.de


In the Mesa versions 7.9.0 - 7.10.2  I get strange triangle
distortion bugs in the game Xonotic. They don't appear in 7.8.2.

http://xwmw.org/misc/triangle_bug_01.jpg
http://xwmw.org/misc/triangle_bug_02.jpg


glxinfo | grep string

server glx vendor string: SGI
server glx version string: 1.2
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
OpenGL vendor string: X.Org R300 Project
OpenGL renderer string: Gallium 0.4 on ATI RV570
OpenGL version string: 2.1 Mesa 7.10.2
OpenGL shading language version string: 1.20


Sebastian H.

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[Bug 36099] Vertex distortion bug in the game Xonotic

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https://bugs.freedesktop.org/show_bug.cgi?id=36099

--- Comment #1 from vand2@gmx.de 2011-04-09 03:12:00 PDT ---
Created an attachment (id=45436)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=45436)
Distorted vertices or missing triangles 1

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[Bug 36099] Vertex distortion bug in the game Xonotic

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https://bugs.freedesktop.org/show_bug.cgi?id=36099

--- Comment #2 from vand2@gmx.de 2011-04-09 03:12:47 PDT ---
Created an attachment (id=45437)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=45437)
Distorted vertices or missing triangles 2

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[Bug 36099] Vertex distortion bug in the game Xonotic

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https://bugs.freedesktop.org/show_bug.cgi?id=36099

--- Comment #3 from vand2@gmx.de 2011-04-09 05:45:07 PDT ---
With the current git version the distortions are gone and all looks ok.

glxinfo now:
glxinfo | grep string

server glx vendor string: SGI
server glx version string: 1.2
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
OpenGL vendor string: X.Org R300 Project
OpenGL renderer string: Gallium 0.4 on ATI RV570
OpenGL version string: 2.1 Mesa 7.11-devel (git-d27ff8c)
OpenGL shading language version string: 1.20

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[Bug 36099] Vertex distortion bug in the game Xonotic

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https://bugs.freedesktop.org/show_bug.cgi?id=36099

--- Comment #4 from Marek Olšák <maraeo@gmail.com> 2011-05-06 05:56:30 PDT ---
(In reply to comment #3)
> With the current git version the distortions are gone and all looks ok.

Could you possibly bisect the fix, so that we can get it to 7.10.x?

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[Bug 36099] Vertex distortion bug in the game Xonotic

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https://bugs.freedesktop.org/show_bug.cgi?id=36099

--- Comment #5 from vand2@gmx.de 2011-05-06 09:56:55 PDT ---
(In reply to comment #4)
> (In reply to comment #3)
> > With the current git version the distortions are gone and all looks ok.
> 
> Could you possibly bisect the fix, so that we can get it to 7.10.x?

Do you mean finding the git commit between 7.8 and 7.9 after which the issue
appeared?

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[Bug 36099] Vertex distortion bug in the game Xonotic

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--- Comment #6 from Marek Olšák <maraeo@gmail.com> 2011-05-06 10:17:04 PDT ---
I mean finding the "fix", i.e. when it started to work again.

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[Bug 36099] Vertex distortion bug in the game Xonotic

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https://bugs.freedesktop.org/show_bug.cgi?id=36099

--- Comment #7 from vand2@gmx.de 2011-05-06 12:20:32 PDT ---
(In reply to comment #6)
> I mean finding the "fix", i.e. when it started to work again.

Ok, I reverted back to 7.10.2 and libdrm 2.4.23.
but the bug didn't show up as I expected.
But by also reverting the kernel back to 2.6.32 the bug was there again.

So
Mesa 7.10.2 + Kernel 2.6.32 -> bug
Mesa 7.10.2 + Kernel 2.6.38 -> no bug

It seems that it actually was a kernel issue and not a Mesa one.

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[Bug 36099] Vertex distortion bug in the game Xonotic

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https://bugs.freedesktop.org/show_bug.cgi?id=36099

Marek Olšák <maraeo@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |NOTOURBUG

--- Comment #8 from Marek Olšák <maraeo@gmail.com> 2011-05-06 12:30:05 PDT ---
OK. I am closing this as NOT-OUR-BUG. r300g in Mesa 7.11 doesn't support old
kernels anyway (the last supported kernel is 2.6.34 and even that one contains
some bugs AFAIK).

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