[Bug 91780] Rendering issues with geometry shader

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Aug 27 14:04:49 PDT 2015


            Bug ID: 91780
           Summary: Rendering issues with geometry shader
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: jonas at wielicki.name
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 117951
  --> https://bugs.freedesktop.org/attachment.cgi?id=117951&action=edit
apitrace which shows the problem

In the attached apitrace, *sometimes* (about 50% of the runs) rendering issues
can be observed. They manifest in appearantly missing geometry (compare
attached screenshot; the UI has been disabled for taking the apitrace).

Steps to reproduce:
1. DRI_PRIME=1 apitrace replay r600-renderbug-noui.trace
2. If step 1 did not show the behaviour, retry a few times.

Expected results:
Rendering should work and show a terrain without holes

Actual results:
Holes in the terrain

The results have been observed on mesa-11.0.0-rc1 with and without
http://lists.freedesktop.org/archives/mesa-dev/2015-August/092766.html applied.

The same code has never (in 50+ tests) shown the issue on the Intel integrated

The application which produces the given behaviour can be found at 

The geometry shader is in:

The usage is in:
(search for draw_elements, GL_GEOMETRY_SHADER, GL_LINES_ADJACENCY)

In another commit, the geometry shader has been disabled
which appears to fix the problem or make it very hard to reproduce.

radeon GPU:
Advanced Micro Devices, Inc. [AMD/ATI] Whistler [Radeon HD
6630M/6650M/6750M/7670M/7690M] (rev ff)  {6630M according to notebook specs}
intel GPU:
Intel Corporation 2nd Generation Core Processor Family Integrated Graphics
Controller (rev 09)

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