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Old 05 October 2016, 18:29   #6
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Join Date: Aug 2004
Posts: 2,941
You could maybe have some hardware assistance by using Direct3D stencil buffer for real-time use:

The stencil mask would correspond to the transparent pixels in each Amiga frame.

Given a frame of background video (e.g. from playing an AVI, assuming there's an API to render AVI frames to a D3D surface) you'd set that as the stencil reference to have it show through. The details could be fiddly; you'd need to scale background video to the emulated Amiga display but maybe Direct3D could handle that and pixel format conversion???
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