Re: features.txt: GL_EXT_gpu_shader4?

Hi Ken,

On 23.10.2017 13:36, Ken Martin wrote:
> 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.

Ok, so it looks like my configuration thinks it is neither OpenGL 3.1
nor 3.2 in VTK7:

https://github.com/Kitware/VTK/blob/v7.1.1/Rendering/OpenGL2/vtkOpenGLRenderWindow.cxx#L632-L648

The llvm version I used for llvmpipe in mesa is 3.9.1:


https://github.com/LLNL/spack/blob/328dc3d14029e576f38e920a4df116af89071dfe/var/spack/repos/builtin/packages/mesa/package.py#L82

and with mesa 17+ it enables llvmpipe with --enable-llvm (instead of
--enable-gallium-llvm of previous versions). Is that the issue?

> 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.

I am confused, the PV list says llvmpipe is not working right now:

  https://www.paraview.org/pipermail/paraview/2017-May/040078.html


Axel

> On Mon, Oct 23, 2017 at 1:49 AM, Axel Huebl <[email protected]
> <mailto:[email protected]>> 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
>     <[email protected] <mailto:[email protected]>> 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 <[email protected]
>         <mailto:[email protected]>> wrote:
> 
>             Hi,
> 
> 
>             I was looking on mesamatrix.net <http://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
>             <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
>             <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
>             <https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_gpu_shader4.txt>
>             --
> 
>             Axel Huebl
>             Phone +49 351 260 3582 <tel:%2B49%20351%20260%203582>
>             https://www.hzdr.de/crp
>             Computational Radiation Physics
>             Laser Particle Acceleration Division
>             Helmholtz-Zentrum Dresden - Rossendorf e.V.
> 
>             Bautzner Landstrasse 400, 01328 Dresden
>             <https://maps.google.com/?q=Bautzner+Landstrasse+400,+01328+Dresden&entry=gmail&source=g>
>             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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> 
> 
> 
>         -- 
>         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>
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> 
> 
> -- 
> Ken Martin PhD
> Distinguished Engineer
> Kitware Inc.
> 28 Corporate Drive
> Clifton Park NY 12065
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-- 

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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