vfilter is for Wii/Gekko only

config.def.h

@@ -468,8 +468,10 @@ static const bool video_shared_context = false;
 /* Sets GC/Wii screen width. */
 static const unsigned video_viwidth = 640;
 
+#ifdef GEKKO
 /* Removes 480i flicker, smooths picture a little. */
 static const bool video_vfilter = true;
+#endif
 
 /* Smooths picture. */
 static const bool video_smooth = true;

gfx/video_driver.h

@@ -102,9 +102,13 @@ typedef struct video_info
     * kind of publicly accessible driver implementation
     * video struct for specific things like this.
     */
+
+   /* Wii-specific settings. Ignored for everything else. */
    unsigned viwidth;
-#endif
    bool vfilter;
+#endif
+   /* If true, applies bilinear filtering to the image,
+    * otherwise nearest filtering. */
    bool smooth;
    /* Maximum input size: RARCH_SCALE_BASE * input_scale */
    unsigned input_scale;