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James Gregory 2013-12-30 15:11:04 +11:00
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<meta name="vspubdate" content="07/01/97" />
<meta name="vscategory" content="Web and Software Development: Game Development,Web and Software Development: Graphics and Multimedia Development" />
<title>Michael Abrash's Graphics Programming Black Book Special Edition: Changing Colors without Writing Pixels</title><!-- HEADER -->
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<title>Michael Abrash's Graphics Programming Black Book Special Edition: Changing Colors without Writing Pixels</title>
<meta name="chapter" content="34" />
<meta name="pages" content="648-650" />
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<p>One thing&rsquo;s for sure, though&mdash;you&rsquo;re not going to be able to cycle all 256 DAC locations cleanly once per frame on a reliable basis across the current generation of PCs. That&rsquo;s why I said at the outset that brute force isn&rsquo;t appropriate to the task of color cycling. That doesn&rsquo;t mean that color cycling can&rsquo;t be used, just that subtler approaches must be employed. Let&rsquo;s look at some of those alternatives.</p>
<h3><a id="Heading8"></a>Color Cycling Approaches that Work</h3>
<h3 id="Heading8">Color Cycling Approaches that Work</h3>
<p>First of all, I&rsquo;d like to point out that when color cycling does work, it&rsquo;s a thing of beauty. Assemble Listing 34.1 so that it doesn&rsquo;t use the BIOS to load the DAC, doesn&rsquo;t guard against interrupts, and uses 286-specific instructions if your computer supports them. Then tinker with <b>CYCLE_SIZE</b> until the color cycling is perfectly clean on your computer. Color cycling looks stunningly smooth, doesn&rsquo;t it? And this is crude color cycling, working with the default color set; switch over to a color set that gradually works its way through various hues and saturations, and you could get something that looks for all the world like true-color animation (albeit working with a small subset of the full spectrum at any one time).</p>
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Graphics Programming Black Book &copy; 2001 Michael Abrash
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