+boolean SDLSetNativeSurface(SDL_Surface **);
+SDL_Surface *SDLGetNativeSurface(SDL_Surface *);
+void SDLCreateBitmapTextures(Bitmap *);
+void SDLFreeBitmapTextures(Bitmap *);
+
+#if defined(TARGET_SDL2)
+SDL_Surface *SDL_DisplayFormat(SDL_Surface *);
+void SDLSetWindowScaling(int);
+void SDLSetWindowScalingQuality(char *);
+void SDLSetWindowFullscreen(boolean);
+#endif
+
+void SDLSetScreenRenderingMode(char *);
+void SDLRedrawWindow();
+void SDLSetWindowTitle(void);
+
+void SDLLimitScreenUpdates(boolean);