[vtk-developers] osmesa status

[Geoff Wright]

Hi Bill,

I don't think it is specifically OpenGL2.  I have been using OpenGL2 for 6
months and the test are all passing on OpenGL2 when I'm using a machine
with an Nvidia graphics card.  The problem happens when switching to OS
mesa.

The errors I'm seeing are single pixel or possibly subpixel offsets in the
image generated by OS-mesa vs images generated by a hardware backed
driver.  Is this a known issue with OS mesa?  I was wondering whether maybe
the tests are running by default with MSAA and its not supported on the OS
mesa back end.

Anyway I will most likely just add some physical machines in my office as
bamboo agents for the VTK test jobs.

Thanks,
Geoff



On Tue, Dec 29, 2015 at 3:30 PM Bill Lorensen <bill.lorensen at gmail.com>
wrote:

> I think the errors are because the Rendering backend is set to OpenGL2
> (which recently became the default). If you set your rendering backend
> to OpenG you should be OK.
>
>
> On Tue, Dec 29, 2015 at 10:34 AM, Geoff Wright <gpwright at gmail.com> wrote:
> > Hello,
> >
> > I'm using VTK in an internal project and wanted to add some extra
> regression
> > tests to support my own use cases.  I setup a new job to build VTK and
> run
> > all existing ctest on my CI server (aws ec2 Ubuntu 14.04, no graphics
> > hardware).
> >
> > I noticed that a substantial portion of the tests are currently failing
> when
> > using os mesa, due to what looks like sub pixel alignment issues.  Is
> this a
> > known problem?  I see that there are a couple of servers on the public
> VTK
> > dashboard configured for OS mesa that are also failing approximately 400
> > tests e.g. https://open.cdash.org/buildSummary.php?buildid=4167821
> >
> > I'm wondering if there is any quick fix to get these working, or is it a
> > known issue with osmesa?  Are the baseline images generated using MSAA?
> Is
> > there an option to change the image comparison to be more generous with
> > single pixel misalignment?  Should I give up on testing VTK in a VM and
> set
> > it up on a physical agent?  I would rather avoid this... any advice is
> much
> > appreciated.   I'm using Mesa 11.0.4 which reports OpenGL information as
> > follows:
> >
> > OpenGL vendor string: VMware, Inc.
> > OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.6, 256 bits)
> > OpenGL core profile version string: 3.2 (Core Profile) Mesa 11.0.4
> > OpenGL core profile shading language version string: 1.50
> > OpenGL core profile context flags: (none)
> > OpenGL core profile profile mask: core profile
> > OpenGL core profile extensions:
> > OpenGL version string: 3.2 (Core Profile) Mesa 11.0.4
> > OpenGL shading language version string: 1.50
> > OpenGL context flags: (none)
> > OpenGL profile mask: core profile
> > OpenGL extensions:
> >
> > Many thanks,
> >
> > Geoff
> >
> >
> >
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