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9<title>VIGetRetraceCount</title>
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13
14<h1 align="left">VIGetRetraceCount</h1>
15
16<h2>Syntax</h2>
17<dl><dd><pre class="construction">
18#include &lt;revolution/vi.h&gt;
19
20u32 VIGetRetraceCount(void);
21</pre></dd></dl>
22
23<h2>Arguments</h2>
24<p>None.</p>
25
26<h2>Return Values</h2>
27<p>The number of retrace interrupts.</p>
28
29<h2>Description</h2>
30<p>This function returns how many retrace interrupts have occurred since the <a href="VIInit.html"><code>VIInit</code></a> function was called.</p>
31
32<h2>Sample Code</h2>
33<p>The following code shows how to achieve 30Hz rendering using this function:</p>
34
35<dl><dd><pre class="construction">
36  VIWaitForRetrace(); // just to make sure the first frame starts
37                      // from the very beginning of the field.
38  while(1) {
39      count = VIGetRetraceCount();
40
41      // rendering
42
43      while (VIGetRetraceCount() == count)
44          ;
45
46      VISetNextFrameBuffer(nextbuffer);
47      VIFlush();
48      VIWaitForRetrace();
49  }
50</pre></dd></dl>
51
52<h2>See Also</h2>
53<P class="reference">
54<a href="VIInit.html">VIInit</a>
55</P>
56
57<h2>Revision History</h2>
58<P>
592006/03/01 Initial version.<br>
60</P>
61
62<hr><p>CONFIDENTIAL</p></body>
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