[vtkusers] Issues when using Mesa 11.2.2

[Chuck Atkins]

Ken,
Just to close the loop on this, I saw this issue pop up on the mesa-users
list and helped Patricio's colleague, Edson, fix it.  You can check out the
thread here if you'd like:
https://lists.freedesktop.org/archives/mesa-users/2016-June/001175.html .
To make a long story short, there's some murky / conflicting configure
options for the current mesa release.  I was able to get get them up and
running and I fixed the issue upstream a while ago.

Sorry I didn't see it over here first :-/


- Chuck

On Tue, Jun 28, 2016 at 5:51 PM, Ken Martin <ken.martin at kitware.com> wrote:

> 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.
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