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1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"> |
2 | <!-- saved from url=(0013)about:internet --> | |
3 | <?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="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. | |
13 | </p><p> | |
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 | |
18 | triangle. | |
19 | </p><p> | |
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. | |
23 | That is, a call to | |
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. | |
29 | </p><p> | |
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 | |
35 | are executed. | |
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. | |
38 | </p><p> | |
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> |