I've programmed an application that superimposes semi-transparent child windows. For this I use the flag WS_EX_COMPOSITED in a common parent window. Now I've found a provider that renders 3D models, but it turns out that the rendering is done using DirectDraw methodologies, and the 3D render window generates a black area with WS_EX_COMPOSITED on, and everything is okay with Composited off. How can I convince the DWM not to draw the DirectDraw window in the DoubleBuffered chain but right after the double buffering, or else that doesn't prevent DirectDraw? Is there any relevant experience?
