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37<H3> 5.7.2 Updating Index Buffers </H3>
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39Updating index buffers can only be done when you lock the buffer for writing; See section <A HREF="manual_45.html#SEC234">5.4 Locking buffers</A> for details. Locking returns a void pointer, which must be cast to the apropriate type; with index buffers this is either an unsigned short (for 16-bit indexes) or an unsigned long (for 32-bit indexes). For example:
40<TABLE><tr><td>&nbsp;</td><td class=example><pre>unsigned short* pIdx = static_cast&#60;unsigned short*&#62;(ibuf-&#62;lock(HardwareBuffer::HBL_DISCARD));
41</pre></td></tr></table>You can then write to the buffer using the usual pointer semantics, just remember to unlock the buffer when you're finished!
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44<A NAME="Hardware Pixel Buffers"></A>
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