GL_EXT_separate_specular_color
http://oss.sgi.com/projects/ogl-sample/registry/EXT/separate_specular_color.txt
	GL_LIGHT_MODEL_COLOR_CONTROL_EXT 0x81F8
	GL_SINGLE_COLOR_EXT 0x81F9
	GL_SEPARATE_SPECULAR_COLOR_EXT 0x81FA