[vtkusers] OpenGL2 using mesa

Tue Sep 27 09:05:57 EDT 2016

Hi Ian,

Ken is right in that your Mesa is using softpipe instead of llvmpipe (see
the line that says "Renderer: Gallium 0.4 on softpipe"), which won't give
you the necessary OpenGL version, at least not out of the box.  There are a
few things you can try though to make it work as is.  See if you can force
the use of llvmpipe instead by setting the environment variable
GALLIUM_DRIVER=llvmpipe.  If your Mesa build contains that driver then it
should force it's use.  Also, try forcing the OpenGL version by setting
MESA_GL_VERSION_OVERRIDE=3.3.  This can work in certain scenarios where the
full openGL spec might not be available but enough of it is for VTK to
use.  Where are the Mesa binaries you're using coming from?

----------
Chuck Atkins
Staff R&D Engineer, Scientific Computing
Kitware, Inc.

On Tue, Sep 27, 2016 at 8:36 AM, Ken Martin <ken.martin at kitware.com> wrote:

> 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>
>>
>>
>>
>> --
>> View this message in context: http://vtk.1045678.n5.nabble.c
>> om/OpenGL2-using-mesa-tp5740561.html
>> Sent from the VTK - Users mailing list archive at Nabble.com.
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>
>
>
> --
> Ken Martin PhD
> Chairman & CFO
> Kitware Inc.
> 28 Corporate Drive
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