[Mesa-users] features.txt: GL_EXT_gpu_shader4?

[Ken Martin]

shader4 is not in mesa and I do not think it ever will be. As Mesa has
opengl 3.2 support it really isn't needed for VTK/PV because OpenGL 3.2
basically includes the features of shader4.

PV supports mesa + llvmpipe for Mesa versions 12.0 and later.  That is why
I suspect something unusual is going on here probably related to
platform/build etc.



On Mon, Oct 23, 2017 at 1:49 AM, Axel Huebl <a.huebl at hzdr.de> wrote:

> Hi Ken,
>
> Thanks for the vtk related answer! The issue even appeared in local
> rendering without hw acceleration. The official paraview answer was to
> build against gallium, but since I am curious about using llvmpipe, I
> searched for up the gpu_shader4 issue.
>
> Do you have any idea on support of that in Mesa since it is not in the
> features.txt?
>
> Axel
>
> On October 23, 2017 4:04:30 AM GMT+02:00, Ken Martin <
> ken.martin at kitware.com> wrote:
>>
>> Really anything after Mesa 12 or so should be good as with llvmpipe or
>> openswr I believe they all support at least OpenGL 3.2 which is what VTK/PV
>> requires. We test VTK nightly against Mesa (master I think ?) to make sure
>> it works. The gpu_shader4 is an old fallback for OpenGL 2.1 systems but
>> Mesa 17 should be providing OpenGL 3.2. So something funny is going on.
>>
>> You might want to try the paraview mailing list as they are pretty
>> familiar with getting PV to build/run with mesa on a variety of systems.
>> Due to interactions with Qt5/VTK/Mesa sometimes there are some tricks to
>> getting it to work.
>>
>> Also if you are doing remote rendering via GLX forwarding/Remote
>> Desktop/etc often times that can have an impact.
>>
>> Thanks!
>> Ken
>>
>>
>>
>>
>>
>> On Sun, Oct 22, 2017 at 3:47 PM, Axel Huebl <a.huebl at hzdr.de> wrote:
>>
>>> Hi,
>>>
>>>
>>> I was looking on mesamatrix.net for the extension "GL_EXT_gpu_shader4"
>>> which is required by recent versions of VTK [1] for its OpenGL2 backend.
>>>
>>> Asking for it on GitHub, I was referred to this list since the web page
>>> is just a parsed list of
>>>
>>>    https://cgit.freedesktop.org/mesa/mesa/tree/docs/features.txt
>>>
>>> The extension seems to be that one: [2]
>>>
>>> I was wondering if the status of "GL_EXT_gpu_shader4" can be added to
>>> the features.txt to get an idea which driver will run with recent
>>> versions of VTK?
>>>
>>> My background: I was trying to use mesa 17.1.5 with llvmpipe driver
>>> (based on llvm 3.8.1) and was surprised that VTK7 failed (in ParaView
>>> 5.4.1) to detect all required OpenGL 3.2 features.
>>>
>>> Another question: is this extension an early version or feature-wise a
>>> sub-set of "GL_ARB_gpu_shader5" in OpenGL 4.0? And as such, would it
>>> make sense to ask the VTK developers to rely on that instead, if
>>> available?
>>>
>>>
>>> Best regards,
>>> Axel
>>>
>>> [1]
>>> https://github.com/Kitware/VTK/blob/v7.1.1/Rendering/OpenGL2
>>> /vtkOpenGLRenderWindow.cxx#L632-L648
>>>
>>> [2]
>>> https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_
>>> gpu_shader4.txt
>>> --
>>>
>>> Axel Huebl
>>> Phone +49 351 260 3582
>>> https://www.hzdr.de/crp
>>> Computational Radiation Physics
>>> Laser Particle Acceleration Division
>>> Helmholtz-Zentrum Dresden - Rossendorf e.V.
>>>
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>>> POB 510119, D-01314 Dresden
>>> Vorstand: Prof. Dr.Dr.h.c. R. Sauerbrey
>>>           Prof. Dr.Dr.h.c. P. Joehnk
>>> VR 1693 beim Amtsgericht Dresden
>>> _______________________________________________
>>> mesa-users mailing list
>>> mesa-users at lists.freedesktop.org
>>> https://lists.freedesktop.org/mailman/listinfo/mesa-users
>>>
>>
>>
>>
>> --
>> Ken Martin PhD
>> Distinguished Engineer
>> Kitware Inc.
>> 28 Corporate Drive
>> <https://maps.google.com/?q=28+Corporate+Drive+Clifton+Park+NY+12065&entry=gmail&source=g>
>> Clifton Park NY 12065
>> <https://maps.google.com/?q=28+Corporate+Drive+Clifton+Park+NY+12065&entry=gmail&source=g>
>>
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>


-- 
Ken Martin PhD
Distinguished Engineer
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065

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