-static DisplayFuncType display_func;
-static KeyboardFuncType keyboard_func;
-static MouseButtonFuncType mouse_button_func;
-static MouseMotionFuncType mouse_motion_func;
-
-void set_display_callback(DisplayFuncType display)
-{
- display_func = display;
-}
-
-void set_keyboard_callback(KeyboardFuncType keyboard)