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Originally Posted by hooverphonique
if the colors set by the copper also need to shift/scroll along with the bitmap,
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Yes. Although with a different speed (I think about vertical scrolling speed /2 or /4).
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you need to move them around as well, which will be almost like generating a new copper list each frame.
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Too bad. That's very expensive. Does Turrican do it the same way?
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with regards to the bitplane pointers, writing the modulos on each scanline and then updating those instead might save some (presuming your bitplanes are below 32k each).
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The bitmaps are quite large (IIRC 352x288x5) and double buffered. Doesn't fit.