<div class="refentry"><a id="glActiveTexture"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glActiveTexture — select active texture unit</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table class="funcprototype-table" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">glActiveTexture</strong>(</code></td><td>GLenum <var class="pdparam">texture</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>texture</code></em></span></dt><dd><p>

Specifies which texture unit to make active. The number

of texture units is implementation dependent, but must be at least

8. <em class="parameter"><code>texture</code></em> must be one of

<code class="constant">GL_TEXTURE</code><math overflow="scroll"><mi mathvariant="italic">i</mi></math>,

where

i ranges from 0 to (<code class="constant">GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS</code> - 1).

The initial value is <code class="constant">GL_TEXTURE0</code>.

</p></dd></dl></div></div><div class="refsect1"><a id="description"></a><h2>Description</h2><p>

<code class="function">glActiveTexture</code> selects which texture unit subsequent texture state calls will

affect. The number of texture units an implementation supports is

implementation dependent, but must be at least 8.

</p></div><div class="refsect1"><a id="errors"></a><h2>Errors</h2><p>

<code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>texture</code></em> is not one of

<code class="constant">GL_TEXTURE</code><math overflow="scroll"><mi mathvariant="italic">i</mi></math>,

where i ranges from 0 to (<code class="constant">GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS</code> - 1).

</p></div><div class="refsect1"><a id="associatedgets"></a><h2>Associated Gets</h2><p>

<a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_ACTIVE_TEXTURE</code> or <code class="constant">GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS</code>

</p></div>

{$pipelinestall}{$examples}

<div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p>

<a class="citerefentry" href="glTexParameter"><span class="citerefentry"><span class="refentrytitle">glTexParameter</span></span></a>

</p></div><div class="refsect1"><div id="Copyright"><h2>Copyright</h2><p>

Copyright © 1991-2006

Silicon Graphics, Inc. This document is licensed under the SGI

Free Software B License. For details, see

<a class="ulink" href="https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/" target="_top">https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/</a>.

</p></div></div></div>