GL_EXT_clip_cull_distance
http://www.opengl.org/registry/specs/EXT/clip_cull_distance.txt
GL_EXT_clip_cull_distance

	GL_MAX_CLIP_DISTANCES_EXT 0x0D32
	GL_CLIP_DISTANCE0_EXT 0x3000
	GL_CLIP_DISTANCE1_EXT 0x3001
	GL_CLIP_DISTANCE2_EXT 0x3002
	GL_CLIP_DISTANCE3_EXT 0x3003
	GL_CLIP_DISTANCE4_EXT 0x3004
	GL_CLIP_DISTANCE5_EXT 0x3005
	GL_CLIP_DISTANCE6_EXT 0x3006
	GL_CLIP_DISTANCE7_EXT 0x3007
	GL_MAX_CULL_DISTANCES_EXT 0x82F9
	GL_MAX_COMBINED_CLIP_AND_CULL_DISTANCES_EXT 0x82FA
