Fix inverting in antialias pass

shaders/graph/1.frag

@@ -107,9 +107,11 @@ void render_side(in sampler1D tex, float idx) {
     float s = get_line_height(tex, idx);
 
     /* and finally set fragment color if we are in range */
-
+    #if INVERT > 0
+    float pos = float(screen.y) - gl_FragCoord.y;
+    #else
     float pos = gl_FragCoord.y;
-
+    #endif
     if (pos + 1.5 <= s) {
         fragment = COLOR;
     } else {