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