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Burlen Loring authored
Added support to vtkOpenGLExtensionManager for fine grained OpenGL driver version detection. Added a flag to enable/disable features with known driver specific bugs for testing new driver releases. This mostly to test future Mesa releases to determine if bugs have been fixed. Used the new feature to see if some long standing Mesa bugs have been fixed in newer Mesa releases for the OS Mesa renderer. * NPOT texture support used by vtkOpenGLContextDevice2D and vtkOpenGL2ContextDevice2D fixed in Mesa >= 8 * reset glReadBuffer to quiet incomplete FBO error report in vtkOpenGLVolumeGPURayCastMapper * vtkOpenGLVolumeGPURayCastMapper tests pass in Mesa >= 9 except TestGPURayCastCompositeShadeMask. Explicitly disabled the test for OS Mesa. * disable FBO for Mesa < 8 because of TestBlurAndSobelPasses TestSobelGradientMagnitudePass test failures * disable vtkOpenGLHAVSVolumeMapper for OS Mesa without Gallium llvmpipe renderer * vtkCompositeRGBAPass needs GL_ARB_texture_float. Mesa may or may not be built with it enabled due to patent restrictions and a bug in 8-9 releases. * Disable FBO for Mesa drivers reporting OpenGL version 1.4 because of incomplete/buggy GL_ARB_draw_buffers. * Although associated ctests run and pass, disable vtkOpenGLVolumeTextureMapper3D for OS Mesa < 9 because of false OpenGL invalid enum report. Change-Id: Ic82aeb4747137aead53251026744baa61ced66d0
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