Instead of closing the joysticks manually, use SDL_QuitSubSystem(SDL_INIT_JOYSTICK) to quit the entire subsystem, which will also close all joysticks correctly. The engine input destructor is replaced with a Shutdown method so we can control when it is called, i.e. before calling SDL_Quit, which forcefully quits all subsystems. CJoystick::Close is removed as we don't need to close joysticks manually anymore.