GL_ARB_clip_control
http://www.opengl.org/registry/specs/ARB/clip_control.txt
GL_ARB_clip_control

	GL_LOWER_LEFT 0x8CA1
	GL_UPPER_LEFT 0x8CA2
	GL_CLIP_ORIGIN 0x935C
	GL_CLIP_DEPTH_MODE 0x935D
	GL_NEGATIVE_ONE_TO_ONE 0x935E
	GL_ZERO_TO_ONE 0x935F
	void glClipControl (GLenum origin, GLenum depth)
