GL_EXT_cmyka
http://www.opengl.org/registry/specs/gl/EXT/cmyka.txt
GL_EXT_cmyka
	GL_CMYK_EXT 0x800C
	GL_CMYKA_EXT 0x800D
	GL_PACK_CMYK_HINT_EXT 0x800E
	GL_UNPACK_CMYK_HINT_EXT 0x800F