93 lines
4.6 KiB
XML
93 lines
4.6 KiB
XML
<?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>
|