tokens: In addition to Chris Dodd 's answer , you can also access the screen-space coordinate ( in pixels , though actually pixel centers and thus ? . 5) of the currently processed fragment through the special fragment shader variable gl_FragCoord :
ner_tags: O O O B-User_Name I-User_Name O O O O O O O O O O O O O O O O O O O O B-Value I-Value I-Value O O O O O O O O O O O B-Variable O