[vtkusers] Offscreen rendering problems on headless Ubuntu

[Ken Martin]

Yes, Andy made a change in VTK master recently (last week?) that I think
may fix the issue. Hopefully :-)

On Fri, Jan 5, 2018 at 10:19 AM, Sophonet <vtk12af6bc42 at kant.sophonet.de>
wrote:

> For the files: This seemed to do the trick with the :
>
> https://www.vtk.org/pipermail/vtk-developers/2017-November/035592.html
>
> Even though print(rw.ReportCapabilities()) did not reveal any extensions,
> rendering now works... hope that this gets fixed some time.
>
> Thanks,
>
>      Sophonet
>
>
> On 2018-01-05 15:42, Sophonet wrote:
>
>> One more update:
>>
>> First of all some correction: glxinfo of course shows the X rendering
>> capabilities, not the OSMesa ones, so glxinfo is not the tool of
>> choice.
>>
>> Then: It seems that Ubuntu's mesa (16.04 update) does not ship with
>> llvmpipe drivers for OSMesa, so I have built OSMesa myself, without X,
>> based on Utkarsh's hints at
>> https://blog.kitware.com/messing-with-mesa-for-paraview-5-0vtk-7-0/.
>>
>> However, it seems that no OpenGL extensions are available (see output
>> below).
>>
>> Any hint how mesa needs to be compiled / what runtime variables need
>> to be set in order to support OpenGL extensions in OSMesa?
>>
>> Thanks,
>>
>>      Sophonet
>>
>>
>> Debug output:
>> In [1]: import vtk
>> In [2]: rw = vtk.vtkRenderWindow()
>> In [3]: rw.SetOffScreenRendering(1)
>> In [4]: rw.Render()
>> ERROR: In
>> /home/CODE1/dep14473/SW/source/VTK-8.1.0/Rendering/OpenGL2/
>> vtkOpenGLRenderWindow.cxx,
>> line 797
>> vtkOSOpenGLRenderWindow (0x2ebb060): GL version 2.1 with the
>> gpu_shader4 extension is not supported by your graphics driver but is
>> required for the new OpenGL rendering backend. Please update your
>> OpenGL driver. If you are using Mesa please make sure you have version
>> 10.6.5 or later and make sure your driver in Mesa supports OpenGL 3.2.
>>
>> In [5]: print(rw.ReportCapabilities())
>> OpenGL vendor string:  VMware, Inc.
>> OpenGL renderer string:  llvmpipe (LLVM 5.0, 256 bits)
>> OpenGL version string:  3.3 (Core Profile) Mesa 17.3.1
>> OpenGL extensions:
>>
>> ---- (No OpenGL extensions are reported)
>>
>>
>> On 2018-01-04 14:35, Sophonet wrote:
>>
>>> Hi list, happy new year!
>>>
>>> I have compiled VTK 8.1.0 on a headless Ubuntu 16.04 with OSMesa
>>> support (flags: -D VTK_RENDERING_BACKEND="OpenGL2" -D
>>> VTK_OPENGL_HAS_OSMESA=True).
>>>
>>> Using python (for example), I see an error about an unsupported OpenGL
>>> version (see below). However, Ubuntu comes with mesa 17.2.4 (which
>>> should be recent enough). Moreover, glxinfo shows "OpenGL core profile
>>> version string: 3.3 (Core Profile) Mesa 17.2.4.
>>>
>>> Any clues what went wrong?
>>>
>>> Thanks,
>>>
>>>       Sophonet
>>>
>>>
>>> In [1]: import vtk
>>> In [2]: rw = vtk.vtkRenderWindow()
>>> In [3]: rw.SetOffScreenRendering(1)
>>> In [4]: rw.Render()
>>> ERROR: In
>>> /home/CODE1/dep14473/SW/source/VTK-8.1.0/Rendering/OpenGL2/
>>> vtkOpenGLRenderWindow.cxx,
>>> line 797
>>> vtkOSOpenGLRenderWindow (0x1991250): GL version 2.1 with the
>>> gpu_shader4 extension is not supported by your graphics driver but is
>>> required for the new OpenGL rendering backend. Please update your
>>> OpenGL driver. If you are using Mesa please make sure you have version
>>> 10.6.5 or later and make sure your driver in Mesa supports OpenGL 3.2.
>>>
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-- 
Ken Martin PhD
Distinguished Engineer
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065

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