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renderer=
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"Content-Type" content=
"text/html; charset=UTF-8" /><title>glArrayElement
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.73.2" /></head><body><div class=
"refentry" lang=
"en" xml:
lang=
"en"><a id=
"glArrayElement"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>glArrayElement — render a vertex using the specified vertex array element
</p></div><div class=
"refsynopsisdiv"><h2>C Specification
</h2><div class=
"funcsynopsis"><table border=
"0" summary=
"Function synopsis" cellspacing=
"0" cellpadding=
"0"><tr><td><code class=
"funcdef">void
<b class=
"fsfunc">glArrayElement
</b>(
</code></td><td>GLint
</td><td><var class=
"pdparam">i
</var><code>)
</code>;
</td></tr></table></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"parameters"></a><h2>Parameters
</h2><div class=
"variablelist"><dl><dt><span class=
"term"><em class=
"parameter"><code>i
</code></em></span></dt><dd><p>
4 Specifies an index into the enabled vertex data arrays.
5 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
6 <code class=
"function">glArrayElement
</code> commands are used within
<a class=
"citerefentry" href=
"glBegin.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBegin
</span></span></a>/
<a class=
"citerefentry" href=
"glEnd.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnd
</span></span></a> pairs to
7 specify vertex and attribute data for point, line, and polygon
8 primitives. If
<code class=
"constant">GL_VERTEX_ARRAY
</code> is enabled when
<code class=
"function">glArrayElement
</code> is called, a
9 single vertex is drawn, using
10 vertex and attribute data taken from location
<em class=
"parameter"><code>i
</code></em> of the enabled
11 arrays. If
<code class=
"constant">GL_VERTEX_ARRAY
</code> is not enabled, no drawing occurs but
12 the attributes corresponding to the enabled arrays are modified.
14 Use
<code class=
"function">glArrayElement
</code> to construct primitives by indexing vertex data, rather than
15 by streaming through arrays of data in first-to-last order. Because
16 each call specifies only a single vertex, it is possible to explicitly
17 specify per-primitive attributes such as a single normal for each
20 Changes made to array data between the execution of
<a class=
"citerefentry" href=
"glBegin.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBegin
</span></span></a> and the
21 corresponding execution of
<a class=
"citerefentry" href=
"glEnd.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnd
</span></span></a> may affect calls to
<code class=
"function">glArrayElement
</code> that are made
22 within the same
<a class=
"citerefentry" href=
"glBegin.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBegin
</span></span></a>/
<a class=
"citerefentry" href=
"glEnd.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnd
</span></span></a> period in nonsequential ways.
24 <code class=
"function">glArrayElement
</code> that precedes a change to array data may
25 access the changed data, and a call that follows a change to array data
26 may access original data.
27 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"notes"></a><h2>Notes
</h2><p>
28 <code class=
"function">glArrayElement
</code> is available only if the GL version is
1.1 or greater.
30 <code class=
"function">glArrayElement
</code> is included in display lists. If
<code class=
"function">glArrayElement
</code> is entered into a
31 display list, the necessary array data (determined by the array
32 pointers and enables) is also entered into the display list. Because
33 the array pointers and enables are client-side state, their values
34 affect display lists when the lists are created, not when the lists
36 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"errors"></a><h2>Errors
</h2><p>
37 <code class=
"constant">GL_INVALID_VALUE
</code> may be generated if
<em class=
"parameter"><code>i
</code></em> is negative.
39 <code class=
"constant">GL_INVALID_OPERATION
</code> is generated if a non-zero buffer object name is bound to an
40 enabled array and the buffer object's data store is currently mapped.
41 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
42 <a class=
"citerefentry" href=
"glClientActiveTexture.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glClientActiveTexture
</span></span></a>,
43 <a class=
"citerefentry" href=
"glColorPointer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glColorPointer
</span></span></a>,
44 <a class=
"citerefentry" href=
"glDrawArrays.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glDrawArrays
</span></span></a>,
45 <a class=
"citerefentry" href=
"glEdgeFlagPointer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEdgeFlagPointer
</span></span></a>,
46 <a class=
"citerefentry" href=
"glFogCoordPointer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glFogCoordPointer
</span></span></a>,
47 <a class=
"citerefentry" href=
"glGetPointerv.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetPointerv
</span></span></a>,
48 <a class=
"citerefentry" href=
"glIndexPointer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glIndexPointer
</span></span></a>,
49 <a class=
"citerefentry" href=
"glInterleavedArrays.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glInterleavedArrays
</span></span></a>,
50 <a class=
"citerefentry" href=
"glNormalPointer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glNormalPointer
</span></span></a>,
51 <a class=
"citerefentry" href=
"glSecondaryColorPointer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glSecondaryColorPointer
</span></span></a>,
52 <a class=
"citerefentry" href=
"glTexCoordPointer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glTexCoordPointer
</span></span></a>,
53 <a class=
"citerefentry" href=
"glVertexPointer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glVertexPointer
</span></span></a>
54 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
55 Copyright
<span class=
"trademark"></span>©
1991-
2006
56 Silicon Graphics, Inc. This document is licensed under the SGI
57 Free Software B License. For details, see
58 <a class=
"ulink" href=
"http://oss.sgi.com/projects/FreeB/" target=
"_top">http://oss.sgi.com/projects/FreeB/
</a>.
59 </p></div></div></body></html>