[Bug 58840] New: rendering error with MSAA on HD6850

[Bug 58840] New: rendering error with MSAA on HD6850

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https://bugs.freedesktop.org/show_bug.cgi?id=58840

          Priority: medium
            Bug ID: 58840
          Assignee: dri-devel@lists.freedesktop.org
           Summary: rendering error with MSAA on HD6850
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: aaalmosss@gmail.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Drivers/Gallium/r600
           Product: Mesa

There are weird rendering errors when OpenGL applications use MSAA framebuffer.
The output is mostly noise. KDE 4.8 with OpenGL compositing is totally unusable
this way.

It is also interesting, that MS visuals are only advertised in glxinfo, if I
have the msaa-capable r600_dri.so installed on the system. If I only enable it
via LIBGL_DRIVERS_PATH and LD_LIBRARY_PATH, they are not advertised, but still
selectable. At least with __GL_FSAA_MODE=4 the applications are broken in the
same way.

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[Bug 58840] rendering error with MSAA on HD6850

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https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #1 from Alex Deucher <agd5f@yahoo.com> ---
Please attach your xorg log and dmesg output.

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[Bug 58840] rendering error with MSAA on HD6850

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https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #2 from almos <aaalmosss@gmail.com> ---
(In reply to comment #1)
> Please attach your xorg log and dmesg output.

The same as the ones at bug 58839

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[Bug 58840] rendering error with MSAA on HD6850

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https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #3 from almos <aaalmosss@gmail.com> ---
Created attachment 72400
  --> https://bugs.freedesktop.org/attachment.cgi?id=72400&action=edit
neverball.png

The frames of Neverball are ok most of the time, but it flashes to garbage like
in the attachment several times per second. The other applications I tried are
sauerbraten and kde-window-manager, those are permanently garbage.

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[Bug 58840] rendering error with MSAA on HD6850

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https://bugs.freedesktop.org/show_bug.cgi?id=58840

almos <aaalmosss@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #72400|text/plain                  |image/png
          mime type|                            |

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[Bug 58840] rendering error with MSAA on HD6850

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https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #4 from almos <aaalmosss@gmail.com> ---
Now I tried again with updated mesa (git-8ed6b14). Now glxgears, sauerbraten,
ut2004 (32bit), fgfs (when did 3d clouds become such a performance killer?) are
fine. Neverball still flashes garbage. Nexuiz is 3fps with AA. Etqw (32bit) and
team fortress 2 (32bit, wine) cause gpu lockup even without AA (I'll bisect
later). Alien-arena with AA dies with
r600_texture.c:776:r600_texture_transfer_map: Assertion
`rtex->resource.b.b.nr_samples <= 1' failed.

In all cases I had to use the env var, even games that support setting AA
cannot do it themselves.

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[Bug 58840] rendering error with MSAA on HD6850

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https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #5 from almos <aaalmosss@gmail.com> ---
Cogs also works, sort of. It has to be started with the __GL_FSAA_MODE=4 env
var *and* antialias must be enabled in the options menu to see AA. However, it
cannot start this way, it says
Couldn't set 1280x960 OpenGL video mode: Couldn't find matching GLX visual
on the next startup. The antialias has to be reset to 0 in
~/.local/share/Cogs/cogs.ini, and re-enabled in the menu. Additionally, there
is a 90% chance of segfault on startup and on changing the antialias setting.

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[Bug 58840] rendering error with MSAA on HD6850

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https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #6 from Marek Olšák <maraeo@gmail.com> ---
(In reply to comment #5)
> Couldn't set 1280x960 OpenGL video mode: Couldn't find matching GLX visual
> on the next startup.

If you want MSAA GLX visuals, you must *install* the gallium driver and restart
the X server for it to pick up the visuals.

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[Bug 58840] rendering error with MSAA on HD6850

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https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #7 from almos <aaalmosss@gmail.com> ---
(In reply to comment #6)
> (In reply to comment #5)
> > Couldn't set 1280x960 OpenGL video mode: Couldn't find matching GLX visual
> > on the next startup.
> 
> If you want MSAA GLX visuals, you must *install* the gallium driver and
> restart the X server for it to pick up the visuals.

I know, but the last time I tried to install it, the whole screen became noise,
like I said in the initial report.

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[Bug 58840] rendering error with MSAA on HD6850

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https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #8 from almos <aaalmosss@gmail.com> ---
Now I tested things again, and I only see rendering errors with neverball.

I don't know if it is expected, but some games completely slow down to a few
fps with msaa enabled (etqw, nexuiz), while others slow down only when lots of
geometry is seen (sauerbraten). I still can't install the msaa-capable
r600_dri.so, because of the kde-window-manager slowdown bug discussed at bug
55998, so I used the __GL_FSAA_MODE=4 env var for the tests.

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[Bug 58840] rendering error with MSAA on HD6850

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https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #9 from Marek Olšák <maraeo@gmail.com> ---
(In reply to comment #8)
> Now I tested things again, and I only see rendering errors with neverball.
> 
> I don't know if it is expected, but some games completely slow down to a few
> fps with msaa enabled (etqw, nexuiz), while others slow down only when lots
> of geometry is seen (sauerbraten). I still can't install the msaa-capable
> r600_dri.so, because of the kde-window-manager slowdown bug discussed at bug
> 55998, so I used the __GL_FSAA_MODE=4 env var for the tests.

Does the slowdown happen with the latest kernel from Linus Torvalds's git?

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[Bug 58840] rendering error with MSAA on HD6850

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https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #10 from almos <aaalmosss@gmail.com> ---
(In reply to comment #9)
> 
> Does the slowdown happen with the latest kernel from Linus Torvalds's git?

Currently I use 3.6.4. I plan to upgrade to 3.7.4 this weekend. How stable is
the git version? How do I check it out? Is 3.8-rc4 enough?

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[Bug 58840] rendering error with MSAA on HD6850

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https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #11 from Marek Olšák <maraeo@gmail.com> ---
The latest kernel may be more stable for your graphics card. You can get it
from:

git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git

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[Bug 58840] rendering error with MSAA on HD6850

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https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #12 from almos <aaalmosss@gmail.com> ---
I happened to check out the git exactly at the tag 3.8-rc5 as HEAD. With that
the preformance issues in etqw and nexuiz are gone. The neverball problem is
still there though.

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[Bug 58840] [r600g][hd6850] rendering error with MSAA

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https://bugs.freedesktop.org/show_bug.cgi?id=58840

Jerome Glisse <glisse@freedesktop.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|rendering error with MSAA   |[r600g][hd6850] rendering
                   |on HD6850                   |error with MSAA

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[Bug 58840] [r600g][hd6850] rendering error with MSAA

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https://bugs.freedesktop.org/show_bug.cgi?id=58840

almos <aaalmosss@gmail.com> changed:

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

--- Comment #13 from almos <aaalmosss@gmail.com> ---
With Mesa 10.1.1 and kernel 3.12 Neverball runs perfectly even with
__GL_FSAA_MODE=4. Closing.

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