GLX_ARB_create_context_profile
http://www.opengl.org/registry/specs/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
