[Mesa-users] features.txt: GL_EXT_gpu_shader4?

[Axel Huebl]

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.
>>
>> Bautzner Landstrasse 400, 01328 Dresden
>> 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
>> _______________________________________________
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>> https://lists.freedesktop.org/mailman/listinfo/mesa-users
>>
>
>
>
>-- 
>Ken Martin PhD
>Distinguished Engineer
>Kitware Inc.
>28 Corporate Drive
>Clifton Park NY 12065
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