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9<title>GXSetTexRegionCallback</title>
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14<h1 align="left">GXSetTexRegionCallback</h1>
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16
17<h2>C Specification</h2>
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19<dl>
20<dd><pre><CODE>#include &lt;revolution/gx.h&gt;
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22typedef <a href="../Structures/GXTexRegion.html">GXTexRegion</a> *(* GXTexRegionCallback)(const <a href="../Structures/GXTexObj.html">GXTexObj</a> *t_obj, <a href="../Enumerated_Types/GXTexMapID.html">GXTexMapID</a> id);</CODE></pre>
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24<dd><pre><CODE>GXTexRegionCallback GXSetTexRegionCallback( GXTexRegionCallback f );
25</CODE></pre>
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27</dl>
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29<h2>Arguments</h2>
30<TABLE border="1" cellpadding="3" cellspacing="0.1">
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32<TD width="120" valign="top" bgcolor="#ffffe8"><em><strong><CODE>f</CODE></strong></em></TD>
33<TD width="520">Pointer to a function which takes <A href="../Structures/GXTexObj.html"><CODE>GXTexObj</CODE></A> and <A href="../Enumerated_Types/GXTexMapID.html"><CODE>GXTexMapID</CODE></A> as arguments and returns a pointer to <A href="../Structures/GXTexRegion.html"><CODE>GXTexRegion</CODE></A>.</TD>
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36<h2>Return Values</h2>
37
38<P>This function returns a pointer to the previous callback function.</P>
39<H2>Description</H2>
40<P>The function <code><em><strong>f</strong></em></code> is called by <a href="GXLoadTexObj.html"><code>GXLoadTexObj</code></a> to obtain an available texture region.&nbsp;<a href="../Management/GXInit.html"><code>GXInit</code></a> calls <a href="GXSetTexRegionCallback.html"><code>GXSetTexRegionCallback</code></a> to set a default region-assignment policy. A programmer can override this default region assignment by implementing his own callback function. A pointer to the texture object and the texture map ID that are passed to <a href="GXLoadTexObj.html"><code>GXLoadTexObj</code></a> are provided to the callback function.</P>
41<BLOCKQUOTE><code>// example of simple texture region allocator<br> GXTexRegion *__GXGetTexRegion(const GXTexObj *tex_obj, GXTexMapID id)<br> {<br> #pragma unused(id)<br> &nbsp;&nbsp;&nbsp; static u32 i = 0;<br> &nbsp;&nbsp;&nbsp; return(__GXTexRegionTab[i++ &amp; 0x0007]);<br> }<br> <br> GXSetTexRegionCallback( __GXGetTexRegion ); // GXInit</code></BLOCKQUOTE>
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43<h2>See Also</h2>
44
45<p><a href="../Management/GXInit.html">GXInit</a><br> <a href="GXLoadTexObj.html">GXLoadTexObj</a><br> <a href="GXSetTlutRegionCallback.html">GXSetTlutRegionCallback</a></p>
46<p><a href="GXTMEMDefault.html">GX Default TMEM Configuration</a></p>
47<H2>Revision History</H2>
48<P>03/01/2006 Initial version.</P>
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