[Bug 74718] New: r600g: graphics artifacts with geometry shaders

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=74718

          Priority: medium
            Bug ID: 74718
                CC: airlied@freedesktop.org
          Assignee: dri-devel@lists.freedesktop.org
           Summary: r600g: graphics artifacts with geometry shaders
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: edwin+mesa@etorok.net
          Hardware: Other
            Status: NEW
           Version: git
         Component: Drivers/DRI/R600
           Product: Mesa

Created attachment 93670
  --> https://bugs.freedesktop.org/attachment.cgi?id=93670&action=edit
geometry.trace

This application uses a geometry shader, and runs without crashing, but there
are graphics artifacts, see geometry.0000001176.png and
geometry.0000001644.png:

Source code for the application can be found here:
https://bitbucket.org/alfonse/gltut/src/1d1479cc7027f1e32c5adff748f3b296f1931d84/Tut%2013%20Impostors/GeomImpostor.cpp?at=default
https://bitbucket.org/alfonse/gltut/src/1d1479cc7027f1e32c5adff748f3b296f1931d84/Tut%2013%20Impostors/data/GeomImpostor.frag?at=default
https://bitbucket.org/alfonse/gltut/src/1d1479cc7027f1e32c5adff748f3b296f1931d84/Tut%2013%20Impostors/data/GeomImpostor.geom?at=default
https://bitbucket.org/alfonse/gltut/src/1d1479cc7027f1e32c5adff748f3b296f1931d84/Tut%2013%20Impostors/data/GeomImpostor.vert?at=default

It doesn't work exactly as is with the upstream source code, due to mismatching
layouts between vert/geom/frag shader, but adding this to all shaders makes it
run:
layout(std140) uniform;

Let me know if a tarball with a working source code would help debugging or if
the apitrace suffices.

I did an apitrace, and rerun it using llvmpipe forced to 3.3, and there are no
artifacts there, see geometry.0000001176.good.png:
$ MESA_GLSL_VERSION_OVERRIDE=330 MESA_GL_VERSION_OVERRIDE=3.3
LIBGL_ALWAYS_SOFTWARE=1 glretrace ./geometry.trace

Kernel is 3.14.0-rc1 + merge of 7c4c62a04a2a80e3feb5d6c97aca1e413b11c790 from
drm-fixes:
$ uname -a
Linux debian 3.14.0-rc1-00015-g7c4c62a #48 SMP PREEMPT Sat Feb 8 17:33:48 EET
2014 x86_64 GNU/Linux

Mesa is from the 10.1 branch:
$ glxinfo |grep OpenGL
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD RV730
OpenGL core profile version string: 3.3 (Core Profile) Mesa 10.1.0-rc1
(git-1e6bba5)
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 10.1.0-rc1 (git-1e6bba5)
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:

Hardware is a Radeon HD 4650:
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV730
PRO [Radeon HD 4650] (prog-if 00 [VGA controller])

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