GLX_INTEL_swap_event
http://www.opengl.org/registry/specs/gl/INTEL/swap_event.txt
GLX_INTEL_swap_event
	GLX_EXCHANGE_COMPLETE_INTEL 0x8180
	GLX_COPY_COMPLETE_INTEL 0x8181
	GLX_FLIP_COMPLETE_INTEL 0x8182
	GLX_BUFFER_SWAP_COMPLETE_INTEL_MASK 0x04000000