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9<title>GXReadVCacheMetric</title>
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13
14<h1 align="left">GXReadVCacheMetric</h1>
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16
17<h2>C Specification</h2>
18
19<dl>
20<dd><PRE><CODE>#include &lt;revolution/gx.h&gt;</CODE></PRE>
21  </dd>
22<dd><pre><CODE>void GXReadVCacheMetric( u32*         check,
23u32*         miss,
24u32*         stall );</CODE></pre>
25  </dd></dl>
26<h2>Arguments</h2>
27<TABLE border="1" cellpadding="3" cellspacing="0.1">
28  <tr>
29<TD width="120" bgcolor="#ffffe8"><em><strong><CODE>check</font></strong></em></TD>
30<TD width="520">The total number of access hits for the vertex cache.</TD>
31    </tr>
32  <tr>
33<TD width="120" bgcolor="#ffffe8"><em><strong><CODE>miss</font></strong></em></TD>
34<TD width="520">The total number of cache misses during access to the vertex cache.</TD>
35    </tr>
36  <tr>
37<TD width="120" bgcolor="#ffffe8"><em><strong><CODE>stall</font></strong></em></TD>
38<TD width="520">The number of GP clock units for which the vertex cache was stalled.</TD>
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40</TABLE>
41<h2>Return Values</h2>
42
43<p>None.</p>
44<H2>Description</H2>
45<P>The Graphics Processor (GP) can count many internal events that give detailed information on performance.&nbsp;This function returns Vertex Cache performance counters.</P>
46<P>Each call to <a href="GXReadVCacheMetric.html"><code>GClearVCacheMetric</code></a> &nbsp; resets the counter to zero.&nbsp;<a href="GXSetVCacheMetric.html"><code>GXSetVCacheMetric</code></a> sets the metric to be measured by the Vertex Cache performance counter.</P>
47<H3>Example</H3>
48<P><code><font size="3">u32 chk, miss, stall;<br> <br> GXSetVCacheMetric(GX_VC_ALL);<br> GXClearVCacheMetric();<br> <br> // Draw Object(s)</font></code></P>
49<P><code><font size="3">// wait until object drawn<br> GXSetDrawSync(0xbeef);<br> while (0xbeef != GXReadDrawSync())<br> &nbsp;&nbsp;&nbsp; ;<br> <br> GXReadVCacheMetric(&amp;chk, &amp;miss, &amp;stall);<br> <br> OSReport(&quot;Vertex Cache miss rate:&nbsp; %f\n&quot;, (f32)miss/(f32)chk);</font></code></P>
50<P>This function reads CPU-accessible registers in the GP and so should not be called in a display list.</P>
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55<h2>See Also</h2>
56
57<p><a href="GXReadMemMetric.html">GXReadMemMetric</a><br> <a href="GXClearMemMetric.html">GXClearMemMetric</a><br> <a href="GXReadPixMetric.html">GXReadPixMetric</a><br> <a href="GXClearPixMetric.html">GXClearPixMetric</a><br> <a href="GXReadGPMetric.html">GXReadGPMetric</a><br> <a href="GXSetGPMetric.html">GXSetGPMetric</a><br> <a href="GXClearGPMetric.html">GXClearGPMetric</a></p>
58<H2>Revision History</H2>
59<P>03/01/2006 Initial version</P>