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James Gregory 2013-12-30 20:26:41 +11:00
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The big question is, How does Listing 34.1 cycle colors? Via the BIOS or
directly? With interrupts enabled or disabled? *Et cetera?*
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![](images/i.jpg) *The key to getting all the color cycling to work in the above example, however, would be to assign each color cycling task a different part of the DAC, with each part cycled independently as needed. If, as is likely, the total number of DAC locations cycled proved to be too great to manage in one frame, you could simply cycle the colors of the stars after one frame, the colors of the meteors after the next, and the colors of the jets after yet another frame, then back around to cycling the colors of the stars. By splitting up the DAC in this manner and interleaving the cycling tasks, you can perform a great deal of seemingly complex color animation without loading very much of the DAC during any one frame.*
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* * * * *
Graphics Programming Black Book © 2001 Michael Abrash