GL_SUNX_constant_data
http://www.opengl.org/registry/specs/gl/SUNX/constant_data.txt
GL_SUNX_constant_data
	GL_UNPACK_CONSTANT_DATA_SUNX 0x81D5
	GL_TEXTURE_CONSTANT_DATA_SUNX 0x81D6
	void glFinishTextureSUNX (void)