[Paraview] Paraview v5.0.0-RC1 with OpenGL2 backend not running using OSMESA v10.5.5

[Aashish Chaudhary]

Utkarsh,

This is great news! few inline comments:

On Thu, Dec 17, 2015 at 1:05 PM, Utkarsh Ayachit <
utkarsh.ayachit at kitware.com> wrote:

> Frank,
>
> First of all, thanks for all your exhausting testing, it's greatly
> appreciated!
>
> * OSMesa and MESA_GL_VERSION_OVERRIDE
>
> Communicating with the Mesa team, we learnt that
> MESA_GL_VERSION_OVERRIDE is a bad idea since it doesnt' really create
> the specified OpenGL context. Thus if anything tries to use features
> from the specific OpenGL version, the rendering would crash and burn.
> Working with Brian Paul from the Mesa team, Ken recently pushed a fix
> to VTK (after the RC2) that uses new OSMesa API to create the correct
> OpenGL context. This new OSMesa API will appear in Mesa 11.2, however.
> Earlier version can be patched using the "alpha" patch that Brian
> provided us (attached).
>

Does this patch cleanly applies to all previous version of Mesa or only
11.1 release? I am assuming that this patch existing in their current
master?

>
> * Classic v/s llvm
>
> Your observation is indeed correct. llvmpipe is the way to go for
> software rendering. On my builds, classic mesa was painstakingly slow
> for rendering even small geometries.
>
> * Issues with LIC
>
> Another correct observation. There are a few regressions in the new
> implementation for SurfaceLIC. Realistically, we  may not be able to
> address these before the 5.0 release. If you're using SurfaceLIC
> heavily, I'd suggest building ParaView 5.0 with the older OpenGL
> backend (or sticking with 4.4) for the interim.
>
> * OSMesa + SWR
>
> While currently I am not sure openswr+osmesa builds are possible, I
> wouldn't be surprised if that on the roadmap. I am going to try to
> contact the OpenSWR team to see if they have any thoughts on that.
>
> Utkarsh
>
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-- 



*| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
*| http://www.kitware.com/company/team/chaudhary.html
<http://www.kitware.com/company/team/chaudhary.html>*
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