public static extern int RenderFillRect(IntPtr renderer, ref SDL_Rect rect);
public static extern int RenderCopy(IntPtr renderer, IntPtr texture, ref SDL_Rect srcrect, ref SDL_Rect dstrect);
public static extern void RenderGetClipRect(IntPtr renderer, out SDL_Rect rect);
public static extern int RenderSetClipRect(IntPtr renderer, ref SDL_Rect rect);
public static extern void RenderGetViewport(IntPtr renderer, out SDL_Rect rect);
public static extern int RenderSetViewport(IntPtr renderer, ref SDL_Rect rect);
public static extern int RenderCopyEx(IntPtr renderer, IntPtr texture, ref SDL_Rect srcrect, ref SDL_Rect dstrect, double angle, ref SDL_Point center, SDL_RendererFlip flip);