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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: 3-D Shading</title><!-- HEADER -->
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<!--ISBN=1576101746//-->
<!--TITLE=Michael Abrash's Graphics Programming Black Book Special Edition//-->
<!--AUTHOR=Michael Abrash//-->
<!--PUBLISHER=The Coriolis Group, Inc.//-->
<title>Michael Abrash's Graphics Programming Black Book Special Edition: 3-D Shading</title>
<meta name="chapter" content="54" />
<meta name="pages" content="1005-1008" />
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<p><br /></p>
<h2><a id="Heading1"></a>Chapter 54<br />
<h2 id="Heading1">Chapter 54<br />
3-D Shading</h2>
<h3><a id="Heading2"></a>Putting Realistic Surfaces on Animated 3-D Objects</h3>
<h3 id="Heading2">Putting Realistic Surfaces on Animated 3-D Objects</h3>
<p>At the end of the previous chapter, X-Sharp had just acquired basic hidden-surface capability, and performance had been vastly improved through the use of fixed-point arithmetic. In this chapter, we&rsquo;re going to add quite a bit more: support for 8088 and 80286 PCs, a general color model, and shading. That&rsquo;s an awful lot to cover in one chapter (actually, it&rsquo;ll spill over into the next chapter), so let&rsquo;s get to it!</p>
<h3><a id="Heading3"></a>Support for Older Processors</h3>
<h3 id="Heading3">Support for Older Processors</h3>
<p>To date, X-Sharp has run on only the 386 and 486, because it uses 32-bit multiply and divide instructions that sub-386 processors don&rsquo;t support. I chose 32-bit instructions for two reasons: They&rsquo;re much faster for 16.16 fixed-point arithmetic than any approach that works on the 8088 and 286; and they&rsquo;re much easier to implement than any other approach. In short, I was after maximum performance, and I was perhaps just a little lazy.</p>
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<div align="center">
Graphics Programming Black Book &copy; 2001 Michael Abrash
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