GLX_ARB_create_context_profile http://www.opengl.org/registry/specs/gl/ARB/glx_create_context.txt GLX_ARB_create_context_profile GLX_CONTEXT_CORE_PROFILE_BIT_ARB 0x00000001 GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB 0x00000002 GLX_CONTEXT_PROFILE_MASK_ARB 0x9126