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Advantage of Flip vs. Blt in DirectDraw

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The way I originally learned DirectDraw was to use Flip for the backbuffer to the primary surface, however, I was looking at other tutorials and books where they simply setup the backbuffer as another offscreen plain surface and just Bit (or BltFast) it to the primary. I''m just wondering what the difference really is. Thanks.

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I think it is safe to assume you are using DX7.

DX7, in windowed mode it is best to have just the primary buffer, and blt stuff to the screen, as long as you are using a clipper.

in Fullscreen mode, have a front and back buffer, and flip them.

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