[vtkusers] Issues when using Mesa 11.2.2

[Ken Martin]

Setting MESA_GL_VERSION_OVERRIDE = 3.2 means your graphics library does not
support OpenGL 3.2 normally. If you are using Mesa 11.2.2 I suspect that
means you are not using the llvmpipe driver (which does support 3.2) but
some other driver. glxinfo can help narrow that down to see what driver is
being used.

Thanks
Ken

On Tue, Jun 28, 2016 at 5:37 PM, Patricio Palma C. <patriciop at gmail.com>
wrote:

> Hello Expert
>
> I'm testing VTK 7.1(git) with OpenGL2 using Mesa 11.2.2 and it fails at
> when rendering the structure.
>
> The first error I got is:
>
> ERROR: In vtkShaderProgram.cxx, line 370
> vtkShaderProgram (0xa385610): Error: GL_EXT_gpu_shader4: required
> extension is not supported.
> Error: failed to preprocess the source.
>
> This was solved by defining MESA_GL_VERSION_OVERRIDE = 3.2
>
> After that VTK request GLSL at least 1.50 then variable
> MESA_GL_VERSION_OVERRIDE is defined as 150
>
> After that I got the following message:
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x00002aaaaf55181b in vtkShaderProgram::FindUniform(char const*) () at
> Rendering/OpenGL2/vtkShaderProgram.cxx:772
> 772   if (name == NULL || !this->Linked)
>
> ​Do you have any idea on how  I could solve this crash?
>
> Regards​
> --
> Patricio Palma Contreras
>
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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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