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James Gregory 2013-12-30 12:25:34 +11:00
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<P><BR></P>
<P>I&#146;d like to emphasize that algorithmically and conceptually, there is <I>no</I> difference between scanning out a polygon top to bottom and scanning it out left to right; it is only in conjunction with the hardware organization of Mode X that the scanning direction matters in the least.</P>
<TABLE WIDTH="100%"><TR>
<TD VALIGN="TOP" ALIGN="LEFT" WIDTH="5%"><IMG SRC="images/58-01i.jpg"><TD VALIGN="TOP" ALIGN="LEFT" WIDTH="95%"><SMALL><I>That&#146;s what Zen programming is all about, though; tying together two pieces of seemingly unrelated information to good effect&#151;and that&#146;s what I had failed to do. Like Robert Heinlein&#151;like all of us&#151;I had viewed the world through a filter composed of my ingrained assumptions, and one of those assumptions, based on all my past experience, was that pixel processing proceeds left to right. Eventually, I might have come up with Chris&#146;s approach; but I would only have come up with it when and if I relaxed and stepped back a little, and allowed myself&#151;almost dared myself&#151;to think of it. When you&#146;re optimizing, be sure to leave quiet, nondirected time in which to conjure up those less obvious solutions, and periodically try to figure out what assumptions you&#146;re making&#151;and then question them!</I></SMALL>
<TD VALIGN="TOP" ALIGN="LEFT" WIDTH="5%"><IMG SRC="images/i.jpg"><TD VALIGN="TOP" ALIGN="LEFT" WIDTH="95%"><SMALL><I>That&#146;s what Zen programming is all about, though; tying together two pieces of seemingly unrelated information to good effect&#151;and that&#146;s what I had failed to do. Like Robert Heinlein&#151;like all of us&#151;I had viewed the world through a filter composed of my ingrained assumptions, and one of those assumptions, based on all my past experience, was that pixel processing proceeds left to right. Eventually, I might have come up with Chris&#146;s approach; but I would only have come up with it when and if I relaxed and stepped back a little, and allowed myself&#151;almost dared myself&#151;to think of it. When you&#146;re optimizing, be sure to leave quiet, nondirected time in which to conjure up those less obvious solutions, and periodically try to figure out what assumptions you&#146;re making&#151;and then question them!</I></SMALL>
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<P><A NAME="Fig3"><!-- </A><A HREF="javascript:displayWindow('images/58-03.jpg',407,145 )"> --><IMG SRC="images/58-03.jpg"><BR><!-- </A>
<BR><A HREF="javascript:displayWindow('images/58-03.jpg',407,145)"> --><FONT COLOR="#000077"><B>Figure 58.3</B></FONT></A>&nbsp;&nbsp;<I>Texture mapping a single vertical column.</I>