Add OGKBitmap.

src/OGKDisplay.m

@@ -31,15 +31,6 @@
 		    exceptionWithClass: self];
 }
 
-+ displayWithSize: (of_dimension_t)size
-       fullscreen: (BOOL)fullscreen
-	resizable: (BOOL)resizable
-{
-	return [[self alloc] initWithSize: size
-			       fullscreen: fullscreen
-				resizable: resizable];
-}
-
 - initWithSize: (of_dimension_t)size
     fullscreen: (BOOL)fullscreen
      resizable: (BOOL)resizable
@@ -75,6 +66,11 @@
 		al_destroy_display(display);
 }
 
+- (void)update
+{
+	al_flip_display();
+}
+
 - (ALLEGRO_DISPLAY*)OGK_allegroDisplay
 {
 	return display;