GLX_SGIX_video_resize
http://oss.sgi.com/projects/ogl-sample/registry/SGIX/video_resize.txt
	GLX_SYNC_FRAME_SGIX 0x00000000
	GLX_SYNC_SWAP_SGIX 0x00000001
	int glXBindChannelToWindowSGIX (Display* display, int screen, int channel, Window window)
	int glXChannelRectSGIX (Display* display, int screen, int channel, int x, int y, int w, int h)
	int glXChannelRectSyncSGIX (Display* display, int screen, int channel, GLenum synctype)
	int glXQueryChannelDeltasSGIX (Display* display, int screen, int channel, int *x, int *y, int *w, int *h)
	int glXQueryChannelRectSGIX (Display* display, int screen, int channel, int *dx, int *dy, int *dw, int *dh)