/// <summary>
        /// Control the the buffers swap of a device.
        /// </summary>
        /// <param name="interval">
        /// A <see cref="System.Int32"/> that specifies the minimum number of video frames that are displayed
        /// before a buffer swap will occur.
        /// </param>
        /// <returns>
        /// It returns a boolean value indicating whether the operation was successful.
        /// </returns>
        public override bool SwapInterval(int interval)
        {
            // Keep into account the SwapIntervalEXT and SwapIntervalSGI entry points, relative to
            // two equivalent GLX extensions

#if false
            using (Glx.XLock displayLock = new Glx.XLock(Display)) {
                if (Glx.Delegates.pglXSwapIntervalEXT != null)
                {
                    Glx.SwapIntervalEXT(Display, _WindowHandle, interval);
                    return(true);
                }
                else if (Glx.Delegates.pglXSwapIntervalSGI != null)
                {
                    return(Glx.SwapIntervalSGI(interval) == 0);
                }
                else
                {
                    throw new InvalidOperationException("binding point SwapInterval{EXT|SGI} cannot be found");
                }
            }
#else
            return(false);
#endif
        }