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Alpha Channels in DDraw

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I'm having some problems creating Alpha surfaces.. I have one bitmap (8-bit bmp) that is the alpha channel of another bitmap (24-bit bmp), creating the 24-bit bitmap works fine, But I have problems creating the alpha surface. I set the ddscaps.lcaps1 to DDSD_OFFSCREEN_PLAIN || DDSD_ALPHA but then I get an error when I create the surface.

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