[vtkusers] OpenGL2 using mesa

[Ken Martin]

It looks like your version of mesa is using softpipe. I believe the better
choice these days is llvmpipe. I think llvmpipe and SWR are the two main
options we use for software rendering now.

On Tue, Sep 27, 2016 at 6:59 AM, ianl <ilindsay at insigniamedical.co.uk>
wrote:

> Hi all,
>
> I am attempting to use VTK built with the new OpenGL2 backend on a
> virtualised environment (Windows Server 2012 R2 running on VirtualBox).
> Unsurprisingly this does not work due to the limitations of VirtualBox's
> OpenGL driver (the old OpenGL backend did work however).
>
> To address this to allow testing, I have downloaded and built Mesa 12.0.3,
> 64 bit target for Windows (Gallium?) with the intention of getting the
> application running so I can do some debugging. I accept that performance
> will not be great.
>
> I have little experience with this, so it is likely that I will have done
> something wrong, but I seem to get the following error from VTK, even
> though
> glview (OpenGL Extensions Viewer 4.4.4) claims that the extension the error
> is talking about (gpu_shader4) is implemented by Mesa:
>
> ERROR: In D:\Build\VTK\VTK 7.1.x
> 23_09_2016\VTKSource\Rendering\OpenGL2\vtkOpenGLRenderWindow.cxx, line 640
> vtkWin32OpenGLRenderWindow (0000007421E0B9A0): GL version 2.1 with the
> gpu_shader4 extension is not supported by your graphics driver but is
> required for the new OpenGL rendering backend. Please update your OpenGL
> driver. If you are using Mesa please make sure you have version 10.6.5 or
> later and make sure your driver in Mesa supports OpenGL 3.2.
>
> I am a bit confused about the final part of the error message about the
> 'driver in Mesa' needing to support OpenGL 3.2, glview states that the
> version supported fully is 3.0, although 3.2 is 80% supported. Does this
> mean that the new back end is not yet supported by the latest version of
> Mesa?
>
> Has anyone else attempted this yet? I have installed Mesa by just copying
> the built opengl32.dll to the local directory and I have verified that this
> is the one being loaded rather than the system one. Are there any options I
> need to set when building Mesa to implement the required extensions?
>
> Thanks in advance,
> Ian
>
> See below for a screenshot of glview:
> <http://vtk.1045678.n5.nabble.com/file/n5740561/glviewScreenShot.jpg>
>
>
>
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-- 
Ken Martin PhD
Chairman & CFO
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065
518 371 3971

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