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I have main render loop in which initially OpenGL drawing is done on SDL window and after that the same window handle is pass to a DirectX device. This device is then doing rending on the same window.

Once I execute the program it will initially draw the OpenGL commands and then do DirectX drawing but overwrites the OpenGL work.

What I want to see is both drawings in parallel.

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by overwrites do you mean that it clears the window before drawing? Do you ever see the openGL drawing on the screen? – Will Jun 25 at 11:32

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