public static GraphicsDeviceService AddRef(IntPtr windowHandle,
int width, int height)
{
// Increment the "how many controls sharing the device" reference count.
if (Interlocked.Increment(ref referenceCount) == 1)
{
// If this is the first control to start using the
// device, we must create the singleton instance.
singletonInstance = new GraphicsDeviceService(windowHandle,
width, height);
}
return singletonInstance;
}