[vtkusers] GL_EXT_gpu_shader4 unsupported help

[Ken Martin]

It looks like you are using OSMesa instead of the normal OpenGL driver.
That is what is causing the issue I believe. If you do want OS mesa then I
believe you need version 11.2 to get the OpenGL 3.2 support. See this nice
post by Utkarsh on using OSMesa with the new VTK rendering engine,

https://www.kitware.com/blog/home/post/999

Thanks
Ken

On Mon, Feb 8, 2016 at 4:55 PM, Kurt Sansom <kayarre at gmail.com> wrote:

> I am having this issue that my compiled version of VTK doesn't like
> GL_EXT_gpu_shader4. I have the latest nvidia drivers installed and what I
> believe is the correct OpenGL version. I messed with several of the CMake
> VTK build settings to no avail. I also ran glxinfo which lists GL_EXT_gpu_shader4.
> the output is attached. Any thoughts or help?
>
> I also tried adding these variables before running which just made the
> program repeat output to the standard out.
>
>  export MESA_GL_VERSION_OVERRIDE=3.2; export
> MESA_GLSL_VERSION_OVERRIDE=150;
>
> Executing vmtklevelsetsegmentation ...
> Please choose initialization type:
>  0: colliding fronts;
>  1: fast marching;
>  2: threshold;
>  3: isosurface;
>  4: seed
>  GL_Version: 2.1 Mesa 10.6.5
> ERROR: In
> /home/ksansom/build/vmtk/vmtk-build/VTK/Rendering/OpenGL2/vtkOpenGLRenderWindow.cxx,
> line 545
> vtkOSOpenGLRenderWindow (0x4a61440): 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.
>
> ERROR: In
> /home/ksansom/build/vmtk/vmtk-build/VTK/Rendering/OpenGL2/vtkShaderProgram.cxx,
> line 369
> vtkShaderProgram (0x3ade100): 1: #version 120
> 2: #extension GL_EXT_gpu_shader4 : require
> ...
> 103:
>
> ERROR: In
> /home/ksansom/build/vmtk/vmtk-build/VTK/Rendering/OpenGL2/vtkShaderProgram.cxx,
> line 370
> vtkShaderProgram (0x3ade100): 0:2(12): error: extension
> `GL_EXT_gpu_shader4' unsupported in fragment shader
>
> --
> Kurt Sansom
>
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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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