[Bug 34280] New: r200 mesa-7.10 font distortion

[Bug 34280] New: r200 mesa-7.10 font distortion

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https://bugs.freedesktop.org/show_bug.cgi?id=34280

           Summary: r200 mesa-7.10 font distortion
           Product: Mesa
           Version: 7.10
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/r200
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: nikai@nikai.net


Created an attachment (id=43358)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=43358)
Celestia screenshot mesa-7.10

r200 mesa-7.10 font distortion

With r200 and mesa-7.10, fonts appear distorted in some OpenGL applications,
like Celestia, extreme-tuxracer, or oolite. In other applications they look
alright, like Stellarium, or Supertuxracer.
The same distortions appear with mesa-git (as of below commit).

With mesa-7.9.1, all fonts look alright.

System environment:
-- system architecture: i686
-- Linux distribution: Gentoo
-- GPU: R200 514D
-- Model: ATI Radeon 9100 QM (AGP)
-- Display connector: VGA
-- xf86-video-ati: 6.14.0
-- xserver: 1.9.2
-- mesa: 07eb660fc92b63213b542d47671b0d944286b77a
-- drm: 550fe2ca3b29ad2191eab4fdfbed9ed21e25492d
-- kernel: 2.6.38-rc3

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[Bug 34280] r200 mesa-7.10 font distortion

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https://bugs.freedesktop.org/show_bug.cgi?id=34280

--- Comment #1 from Nicolas Kaiser <nikai@nikai.net> 2011-02-14 16:44:55 PST ---
Created an attachment (id=43359)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=43359)
Celestia screenshot mesa-7.9.1

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[Bug 34280] r200 mesa-7.10 font distortion

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https://bugs.freedesktop.org/show_bug.cgi?id=34280

--- Comment #2 from Alex Deucher <agd5f@yahoo.com> 2011-02-14 22:15:28 PST ---
Can you bisect?

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[Bug 34280] r200 mesa-7.10 font distortion

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https://bugs.freedesktop.org/show_bug.cgi?id=34280

--- Comment #3 from Nicolas Kaiser <nikai@nikai.net> 2011-02-15 07:38:24 PST ---
(In reply to comment #2)
> Can you bisect?

Sure, I bisected to 5d1387b2da3626326410804026f8b92f1a121fdc
 Ian Romanick, "ARB_texture_rg: Add R8, R16, RG88, and RG1616 internal
formats".

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[Bug 34280] r200 mesa-7.10 font distortion

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https://bugs.freedesktop.org/show_bug.cgi?id=34280

--- Comment #4 from Nicolas Kaiser <nikai@nikai.net> 2011-02-18 14:24:35 PST ---
I tried to partially revert the commit.

It looks to me like I can add R8, R16, and RG1616 without a problem.
But when I add RG88, the distortions appear.

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[Bug 34280] r200 mesa-7.10 font distortion

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https://bugs.freedesktop.org/show_bug.cgi?id=34280

--- Comment #5 from Nicolas Kaiser <nikai@nikai.net> 2011-02-20 10:42:58 PST ---
Created an attachment (id=43579)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=43579)
screenshot extreme-tuxracer mesa-git

This screenshot from extreme-tuxracer might give a better impression of the
problem. Every letter appears to get duplicated.

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[Bug 34280] r200 mesa-7.10 font distortion

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https://bugs.freedesktop.org/show_bug.cgi?id=34280

Ian Romanick <idr@freedesktop.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
         AssignedTo|dri-devel@lists.freedesktop |idr@freedesktop.org
                   |.org                        |

--- Comment #6 from Ian Romanick <idr@freedesktop.org> 2011-02-21 14:34:36 PST ---
(In reply to comment #3)
> (In reply to comment #2)
> > Can you bisect?
> 
> Sure, I bisected to 5d1387b2da3626326410804026f8b92f1a121fdc
>  Ian Romanick, "ARB_texture_rg: Add R8, R16, RG88, and RG1616 internal
> formats".

That's pretty weird.  I don't see how that change could impact r200.  The only
thing that seems to have a chance is if something weird happens in the
GL_LUMINANCE8_ALPHA8 case.  What happens if you apply this mini-patch?  This
isn't a fix, but it may help illuminate what's going wrong.

diff --git a/src/mesa/drivers/dri/radeon/radeon_texture.c
b/src/mesa/drivers/dri/radeon/radeon_texture.c
index cf85a5b..75dc107 100644
--- a/src/mesa/drivers/dri/radeon/radeon_texture.c
+++ b/src/mesa/drivers/dri/radeon/radeon_texture.c
@@ -464,7 +464,7 @@ gl_format radeonChooseTextureFormat(struct gl_context *
ctx,
        case GL_LUMINANCE12_ALPHA12:
        case GL_LUMINANCE16_ALPHA16:
        case GL_COMPRESSED_LUMINANCE_ALPHA:
-               return _dri_texformat_al88;
+               return radeonChoose8888TexFormat(rmesa, format, type, fbo);

        case GL_INTENSITY:
        case GL_INTENSITY4:

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