GL_IMG_texture_env_enhanced_fixed_function
https://www.khronos.org/registry/OpenGL/extensions/IMG/IMG_texture_env_enhanced_fixed_function.txt
GL_IMG_texture_env_enhanced_fixed_function

	GL_DOT3_RGBA_IMG 0x86AF
	GL_MODULATE_COLOR_IMG 0x8C04
	GL_RECIP_ADD_SIGNED_ALPHA_IMG 0x8C05
	GL_TEXTURE_ALPHA_MODULATE_IMG 0x8C06
	GL_FACTOR_ALPHA_MODULATE_IMG 0x8C07
	GL_FRAGMENT_ALPHA_MODULATE_IMG 0x8C08
	GL_ADD_BLEND_IMG 0x8C09