[Mesa-users] features.txt: GLEW_EXT_gpu_shader4?

[Ken Martin]

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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> mesa-users at lists.freedesktop.org
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>



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

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