[vtkusers] vtkOpenGLGPUVolumeRayCastMapper on a specific GPU

[chasank]

Create an OpenGL context on your code, then,

gl_vendor = (const char *) (glGetString(GL_VENDOR));
gl_model = (const char *) (glGetString(GL_RENDERER));
if ( strstr(gl_vendor, "ATI" ) != 0 )
{
    // make your arrangement		
}
else if ( strstr(gl_vendor, "NVIDIA") != 0)
{
    // make your arrangement		
}

GL_VENDOR just returns the name of the GPU vendor while GL_RENDERER returns
the name of the GPU card.

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