public static Direct3D9ViewportImplementor GetInstance()
        {
            if (instance == null)
            {
                instance = new Direct3D9ViewportImplementor();
            }

            return(instance);
        }
        public static Direct3D9ViewportImplementor GetInstance()
        {
            if (instance == null)
            {
                instance = new Direct3D9ViewportImplementor();
            }

            return instance;
        }