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OpenGL Multiple Transparent OpenGL windows

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Hi all,

I'm looking at creating two OpenGL windows which are rendering a movie each, one on top of the other, with the top windows movie having a transparent background so we can see the underlying windows movie playing behind it.

Is this possible? If so are there any tutorials available or any help you can provide?

Here are the links I have managed to source myself:

http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=194444&fpart=3

http://stackoverflow.com/questions/4052940/win32-how-to-make-an-opengl-rendering-context-with-transparent-background

http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=194456&page=1

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