Bug 63469 - OSMesa Gallium llvmpipe VTK Test Failures
Summary: OSMesa Gallium llvmpipe VTK Test Failures
Alias: None
Product: Mesa
Classification: Unclassified
Component: Drivers/Gallium/llvmpipe (show other bugs)
Version: git
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: mesa-dev
QA Contact:
Depends on:
Reported: 2013-04-12 12:50 UTC by Kevin Hobbs
Modified: 2019-09-18 18:31 UTC (History)
0 users

See Also:
i915 platform:
i915 features:


Description Kevin Hobbs 2013-04-12 12:50:48 UTC
Since OSMesa switched to Gallium and defaults to the llvmpipe driver VTK's test :


has been failing.

This test has a page on VTK's dashboard :


The take home message is that the test passes in my OSMesa-9.1.1 build which uses the Mesa Offscreen driver and fails on all of the builds that use the llvmpipe driver.

I played around with different drivers by setting GALLIUM_DRIVER to one llvmpipe or softpipe and used on screen and off screen builds of VTK. I set LIBGL_ALWAYS_SOFTWARE to get one of the software drivers or left it unset to use the nouveau driver on my on screen build. What I got was :

OSMesa-9.1.1 offscreen pass
OSMesa-git   softpipe  pass
OSMesa-git   llvmpipe  fail
  Mesa-9.1.1 softpipe  pass
  Mesa-9.1.1 nouveau   pass
  Mesa-9.1.1 llvmpipe  fail
  Mesa-git   softpipe  pass
  Mesa-git   nouveau   pass
  Mesa-git   llvmpipe  fail

which says that llvmpipe is the issue.

I did a bunch of apitraces and put them here :

Comment 1 Brian Paul 2013-04-20 18:35:34 UTC
Thanks for the traces.  It appears that we've got the sub-pixel positioning of lines incorrect in llvmpipe.  Softpipe matches NVIDIA's driver but llvmpipe is off by a half pixel both in x and y.  I'm digging into it.
Comment 2 GitLab Migration User 2019-09-18 18:31:19 UTC
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