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Saving another frame and using it as background

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Hi :) The title is long enough i think :D how can i save another frame and use it as background to another frame? I know how to overwrite,you just dont clear the buffer. But is there any other way different then overwrite? Actually im gonna pause the game and draw a menu as sprite. Any other ideas on how to draw the menu would be appreciated =)

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Copy the back buffer to a RT texture using IDirect3DDevice9::StretchRects and then use that in the subsequent frames.
You'll have to oversize the target texture and update only part of it if your graphics card can't do non-power 2 textures.

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