[vtkusers] TEXTURE_BUFFER fails : pure OpenGL vs vtkgl ?

[Butterfly]

I managed to force the needed function pointers to be assigned properly by
loading the following extension:

renWin->GetExtensionManager()->LoadExtension("GL_EXT_texture_buffer_object");

*It remains unclear why Buffer Textures are still considered as an extension
by VTK, although this functionality was included in the core since OpenGL
3.1 (2009)...*



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