[Paraview] OpenGL Backend Identification

[Tim Thirion]

Hi ParaView devs,

I'm looking to provide run-time identification of the current OpenGL
backend in use. Some questions:

1. VTK #defines VTK_OPENGL2, but ParaView #defines VTKGL2. Is there a
particular reason we have both?
2. Is there an ideal place to define such a constant? Perhaps on the render
window?

TT
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