diff -r 907929fa9b59 -r 9dbb9c8c115b ccdemos/common_sdl.h
--- a/ccdemos/common_sdl.h	Wed Apr 23 19:35:03 2008 +0200
+++ b/ccdemos/common_sdl.h	Thu Apr 24 10:49:11 2008 +0200
@@ -52,7 +52,7 @@
 }
 
 void loop_sdl(Raytracer &rt, Camera &cam,
-	void (*update_callback)() = NULL, void (*key_callback)(int, int) = NULL)
+	void (*update_callback)(Float*) = NULL, void (*key_callback)(int, int) = NULL)
 {
 	SDL_Surface *screen;
 	Float *render_buffer;
@@ -156,7 +156,7 @@
 		if (move != 0.0)
 			cam.move(move,0,0);
 		if (update_callback != NULL)
-			update_callback();
+			update_callback(render_buffer);
 		update(rt, screen, render_buffer);
 	}
 	free(render_buffer);