recalculating size ratio every frame for now... callbacks too complicated

com/danitheskunk/skunkworks/backends/gl/Filter.java

@@ -23,7 +23,10 @@ public abstract class Filter {
 	}
 
 	public void apply() {
+		//shouldn't be calculating size ratio every frame,
+		//but getting all the callbacks right is hard
 		calcSizeRatio();
+
 		output.bind();
 		input.bindTexture();
 		program.use();