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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
<refentry id="glActiveTexture">
<refmeta>
<refmetainfo>
<copyright>
<year>1991-2006</year>
<holder>Silicon Graphics, Inc.</holder>
</copyright>
</refmetainfo>
<refentrytitle>glActiveTexture</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>glActiveTexture</refname>
<refpurpose>select active texture unit</refpurpose>
</refnamediv>
<refsynopsisdiv><title>C Specification</title>
<funcsynopsis>
<funcprototype>
<funcdef>void <function>glActiveTexture</function></funcdef>
<paramdef>GLenum <parameter>texture</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<!-- eqn: ignoring delim $$ -->
<refsect1 id="parameters"><title>Parameters</title>
<variablelist>
<varlistentry>
<term><parameter>texture</parameter></term>
<listitem>
<para>
Specifies which texture unit to make active. The number
of texture units is implementation dependent, but must be at least
two. <parameter>texture</parameter> must be one of
<constant>GL_TEXTURE</constant><inlineequation><mml:math><mml:mi mathvariant="italic">i</mml:mi></mml:math></inlineequation>,
where
i ranges from 0 to the larger of (<constant>GL_MAX_TEXTURE_COORDS</constant> - 1)
and (<constant>GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS</constant> - 1).
The initial value is <constant>GL_TEXTURE0</constant>.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="description"><title>Description</title>
<para>
<function>glActiveTexture</function> 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 2.
</para>
<para>
Vertex arrays are client-side GL resources, which are selected by the
<citerefentry><refentrytitle>glClientActiveTexture</refentrytitle></citerefentry> routine.
</para>
</refsect1>
<refsect1 id="notes"><title>Notes</title>
<para>
<function>glActiveTexture</function> is only supported if the GL version is 1.3 or greater, or if
<code>ARB_multitexture</code> is included in the string returned by
<citerefentry><refentrytitle>glGetString</refentrytitle></citerefentry> when called with the argument <constant>GL_EXTENSIONS</constant>.
</para>
</refsect1>
<refsect1 id="errors"><title>Errors</title>
<para>
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>texture</parameter> is not one of
<constant>GL_TEXTURE</constant><inlineequation><mml:math><mml:mi mathvariant="italic">i</mml:mi></mml:math></inlineequation>,
where i ranges from 0 to the larger of (<constant>GL_MAX_TEXTURE_COORDS</constant> - 1)
and (<constant>GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS</constant> - 1).
</para>
</refsect1>
<refsect1 id="associatedgets"><title>Associated Gets</title>
<para>
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_ACTIVE_TEXTURE</constant>, <constant>GL_MAX_TEXTURE_COORDS</constant>, or <constant>GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS</constant>
</para>
</refsect1>
<refsect1 id="seealso"><title>See Also</title>
<para>
<citerefentry><refentrytitle>glClientActiveTexture</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glMultiTexCoord</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>
</para>
</refsect1>
<refsect1 id="Copyright"><title>Copyright</title>
<para>
Copyright <trademark class="copyright"></trademark> 1991-2006
Silicon Graphics, Inc. This document is licensed under the SGI
Free Software B License. For details, see
<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
</para>
</refsect1>
</refentry>