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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: Assume Nothing</title><!-- HEADER -->
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<title>Michael Abrash's Graphics Programming Black Book Special Edition: Assume Nothing</title>
<meta name="chapter" content="03" />
<meta name="pages" content="065-067" />
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<p>Finally, please note that the <i>precision</i> Zen timer works perfectly well on both PS/2 and non-PS/2 computers. The PS/2 and 8253 considerations we&rsquo;ve just discussed apply <i>only</i> to the longZen timer.</p>
<h3><a id="Heading14"></a>Example Use of the Long-Period Zen Timer</h3>
<h3 id="Heading14">Example Use of the Long-Period Zen Timer</h3>
<p>The long-period Zen timer has exactly the same calling interface as the precision Zen timer, and can be used in place of the precision Zen timer simply by linking it to the code to be timed in place of linking the precision timer code. Whenever the precision Zen timer informs you that the code being timed takes too long for the precision timer to handle, all you have to do is link in the long-period timer instead.</p>
<p>Listing 3.6 shows a test-bed program for the long-period Zen timer. While this program is similar to Listing 3.2, it&rsquo;s worth noting that Listing 3.6 waits for a few seconds before calling <b>ZTimerOn</b>, thereby allowing any pending keyboard interrupts to be processed. Since interrupts must be left on in order to time periods longer than 54 ms, the interrupts generated by keystrokes (including the upstroke of the Enter key press that starts the program)&mdash;or any other interrupts, for that matter&mdash;could incorrectly inflate the time recorded by the long-period Zen timer. In light of this, resist the temptation to type ahead, move the mouse, or the like while the long-period Zen timer is timing.</p>
<p><b>LISTING 3.6 LZTEST.ASM</b></p><!-- CODE //-->
<p><b>LISTING 3.6 LZTEST.ASM</b></p>
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; Program to measure performance of code that takes longer than
; 54 ms to execute. (LZTEST.ASM)
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<p>As with the precision Zen timer, the program in Listing 3.6 is used by naming the file containing the code to be timed TESTCODE, then assembling both Listing 3.6 and Listing 3.5 with MASM or TASM and linking the two files together by way of the Microsoft or Borland linker. Listing 3.7 shows a batch file, named LZTIME.BAT, which does all of the above, generating and running the executable file LZTEST.EXE. LZTIME.BAT assumes that the file LZTIMER.ASM contains Listing 3.5 and the file LZTEST.ASM contains Listing 3.6.</p>
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<div align="center">
Graphics Programming Black Book &copy; 2001 Michael Abrash
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