Nouveau - Mar 2012 - [Bug 46956] New: Selecting 2xAntiAliasing causes Nexuiz to crash "X Error: BadMatch, failed request (X_CreateWindow)"

https://bugs.freedesktop.org/show_bug.cgi?id=46956

             Bug #: 46956
           Summary: Selecting 2xAntiAliasing causes Nexuiz to crash "X
                    Error: BadMatch, failed request (X_CreateWindow)"
    Classification: Unclassified
           Product: Mesa
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: emil.l.velikov at gmail.com


Created attachment 58004
  --> https://bugs.freedesktop.org/attachment.cgi?id=58004
Nexuiz console output

How to:
1. Startup Nexuiz
2. Select Settings>Effects
3. Set Antialiasing to 2x
4. Click Apply immediately
5. Observe the crash

Issue is not present when
* 0xAA, 4xAA mode is selected in Nexuiz
* Software rendering is used - LIBGL_ALWAYS_SOFTWARE=1

Issue is independent on
* kernel version
* direct/indirect rendering - LIBGL_ALWAYS_INDIRECT=1 makes no difference
* Desktop enviroment - Gnome3, fluxbox


Distribution - Arch x86-64
Nexuiz - 2.5.2 Nexuiz Linux 02:51:06 Oct  1 2009 9271 release
kernel - 3.0.22 / 3.2.8 / nouveau-git
libdrm - 2.4.31
Mesa - 95594bae47d8b3302be188e6f0be2d69c5507bb3
xf86-video-nouveau - b0d7f4ddd94154491d04dcb9698d63d61e9240d
Xorg - 1.11.4



The issue was bisected to

commit b2dcf880e8bcd61be59602f5a2d18c77a5fc60c1
Author: Christoph Bumiller <e0425955 at student.tuwien.ac.at>
Date:   Mon Jul 11 18:02:27 2011 +0200

    nv50,nvc0: add support for multi-sample resources

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Emil Velikov <emil.l.velikov at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #58004|application/octet-stream    |text/plain
          mime type|                            |

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--- Comment #1 from Emil Velikov <emil.l.velikov at gmail.com> 2012-03-04
06:19:15 PST ---
Created attachment 58005
  --> https://bugs.freedesktop.org/attachment.cgi?id=58005
nv50_screen_is_format_supported - debug info

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--- Comment #2 from Emil Velikov <emil.l.velikov at gmail.com> 2012-03-04
06:21:40 PST ---
Created attachment 58006
  --> https://bugs.freedesktop.org/attachment.cgi?id=58006
nv50_screen_is_format_supported - debug info, disallow sample_count=2

Nexuiz works great if we return False when sample_count is 2

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--- Comment #3 from Emil Velikov <emil.l.velikov at gmail.com> 2012-03-04
06:24:32 PST ---
IMHO this is a mesa and/or X fault, although I'm out of ideas

I'm happy to test any patches/provide any additional information

Thanks
Emil

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--- Comment #4 from Christoph Bumiller <e0425955 at student.tuwien.ac.at>
2012-03-04 08:53:54 PST ---
Created attachment 58007
  --> https://bugs.freedesktop.org/attachment.cgi?id=58007
Patch to disable MS visuals.

Does that help ?

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--- Comment #5 from Emil Velikov <emil.l.velikov at gmail.com> 2012-03-04
12:05:50 PST ---
Works like a charm

Note: Nexuiz complains about
"Couldn't get an RGB, Double-buffered, Depth visual"

Although everything works as expected


Thanks
Emil

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--- Comment #6 from Emil Velikov <emil.l.velikov at gmail.com> 2012-03-14
12:59:19 PDT ---
The issue exists in xonotic 0.6 (nexuiz fork)

I would not mind filing the bug in xonotic if it is an application issue

Regards
Emil

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Emil Velikov <emil.l.velikov at gmail.com> changed:

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

--- Comment #7 from Emil Velikov <emil.l.velikov at gmail.com> 2012-05-29
12:47:09 PDT ---
Thank you, the issue was resolved by

commit f80c2874eca86a12517fbe2f4c15287edfb4dc89
Author: Christoph Bumiller <e0425955 at student.tuwien.ac.at>
Date:   Mon May 21 23:46:11 2012 +0200

    gallium: add st_api feature mask to prevent advertising MS visuals

    v2: use a define for the maximum sample count
    v3: also test odd sample counts (r300 supports MS3)

    While multisample renderbuffers are supported by mesa, MS visuals
    are not, so we need a way to tell dri/st not to advertise them even
    if the gallium driver does support multisampled surfaces.

    Otherwise applications selecting these non-functional visuals would
    run into trouble ...

    Reviewed-by: Brian Paul <brianp at vmware.com>

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