GL_EXT_clip_control
https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_clip_control.txt
GL_EXT_clip_control

	GL_LOWER_LEFT_EXT 0x8CA1
	GL_UPPER_LEFT_EXT 0x8CA2
	GL_CLIP_ORIGIN_EXT 0x935C
	GL_CLIP_DEPTH_MODE_EXT 0x935D
	GL_NEGATIVE_ONE_TO_ONE_EXT 0x935E
	GL_ZERO_TO_ONE_EXT 0x935F
	void glClipControlEXT (GLenum origin, GLenum depth)