GL_AMD_compressed_ATC_texture
http://www.opengl.org/registry/specs/AMD/compressed_ATC_texture.txt
GL_AMD_compressed_ATC_texture

	GL_ATC_RGBA_INTERPOLATED_ALPHA_AMD 0x87EE
	GL_ATC_RGB_AMD 0x8C92
	GL_ATC_RGBA_EXPLICIT_ALPHA_AMD 0x8C93