Since OSMesa switched to Gallium and defaults to the llvmpipe driver VTK's test : vtkRenderingOpenGLCxx-TestTransformCoordinateUseDouble has been failing. This test has a page on VTK's dashboard : http://open.cdash.org/testSummary.php?project=11&name=vtkRenderingOpenGLCxx-TestTransformCoordinateUseDouble&date=2013-04-12 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 : http://crab-lab.zool.ohiou.edu/kevin/vtk_apitraces.tar.bz2
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.
-- GitLab Migration Automatic Message -- This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity. You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/227.
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.