/// <summary>
/// Create the native surface handle.
/// </summary>
/// <param name="configId">
/// A <see cref="IntPtr"/> that specifies the configuration ID.
/// </param>
/// <param name="attribs">
/// A <see cref="T:int[]"/> that lists the handle attributes.
/// </param>
/// <exception cref="InvalidOperationException">
/// Exception thrown if the handle is already created.
/// </exception>
public override void CreateHandle(IntPtr configId, int[] attribs)
{
if (_Handle != IntPtr.Zero)
{
throw new InvalidOperationException("handle already created");
}
if ((_Handle = Egl.CreatePbufferSurface(_Display, configId, attribs)) == IntPtr.Zero)
{
throw new InvalidOperationException("unable to create window surface");
}
}