1 <?xml version=
"1.0" encoding=
"UTF-8"?>
2 <!DOCTYPE book PUBLIC
"-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
3 "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
4 <refentry id=
"glActiveTexture">
9 <holder>Silicon Graphics, Inc.
</holder>
12 <refentrytitle>glActiveTexture
</refentrytitle>
13 <manvolnum>3G
</manvolnum>
16 <refname>glActiveTexture
</refname>
17 <refpurpose>select active texture unit
</refpurpose>
19 <refsynopsisdiv><title>C Specification
</title>
22 <funcdef>void
<function>glActiveTexture
</function></funcdef>
23 <paramdef>GLenum
<parameter>texture
</parameter></paramdef>
27 <!-- eqn: ignoring delim $$ -->
28 <refsect1 id=
"parameters"><title>Parameters
</title>
31 <term><parameter>texture
</parameter></term>
34 Specifies which texture unit to make active. The number
35 of texture units is implementation dependent, but must be at least
36 48.
<parameter>texture
</parameter> must be one of
37 <constant>GL_TEXTURE
<emphasis>i
</emphasis></constant>,
39 <emphasis>i
</emphasis> ranges from
0 (
<constant>GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS
</constant> -
1).
40 The initial value is
<constant>GL_TEXTURE0
</constant>.
46 <refsect1 id=
"description"><title>Description
</title>
48 <function>glActiveTexture
</function> selects which texture unit subsequent texture state calls will
49 affect. The number of texture units an implementation supports is
50 implementation dependent, but must be at least
48.
53 <refsect1 id=
"errors"><title>Errors
</title>
55 <constant>GL_INVALID_ENUM
</constant> is generated if
<parameter>texture
</parameter> is not one of
56 <constant>GL_TEXTURE
<emphasis>i
</emphasis></constant>,
57 where
<emphasis>i
</emphasis> ranges from
0 to (
<constant>GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS
</constant> -
1).
60 <refsect1 id=
"associatedgets"><title>Associated Gets
</title>
62 <citerefentry><refentrytitle>glGet
</refentrytitle></citerefentry> with argument
<constant>GL_ACTIVE_TEXTURE
</constant>, or
<constant>GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS
</constant>.
65 <refsect1 id=
"seealso"><title>See Also
</title>
67 <citerefentry><refentrytitle>glGenTextures
</refentrytitle></citerefentry>,
68 <citerefentry><refentrytitle>glBindTexture
</refentrytitle></citerefentry>,
69 <citerefentry><refentrytitle>glCompressedTexImage1D
</refentrytitle></citerefentry>,
70 <citerefentry><refentrytitle>glCompressedTexImage2D
</refentrytitle></citerefentry>,
71 <citerefentry><refentrytitle>glCompressedTexImage3D
</refentrytitle></citerefentry>,
72 <citerefentry><refentrytitle>glCompressedTexSubImage1D
</refentrytitle></citerefentry>,
73 <citerefentry><refentrytitle>glCompressedTexSubImage2D
</refentrytitle></citerefentry>,
74 <citerefentry><refentrytitle>glCompressedTexSubImage3D
</refentrytitle></citerefentry>,
75 <citerefentry><refentrytitle>glCopyTexImage1D
</refentrytitle></citerefentry>,
76 <citerefentry><refentrytitle>glCopyTexImage2D
</refentrytitle></citerefentry>,
77 <citerefentry><refentrytitle>glCopyTexSubImage1D
</refentrytitle></citerefentry>,
78 <citerefentry><refentrytitle>glCopyTexSubImage2D
</refentrytitle></citerefentry>,
79 <citerefentry><refentrytitle>glCopyTexSubImage3D
</refentrytitle></citerefentry>,
80 <citerefentry><refentrytitle>glDeleteTextures
</refentrytitle></citerefentry>
81 <citerefentry><refentrytitle>glIsTexture
</refentrytitle></citerefentry>,
82 <citerefentry><refentrytitle>glTexImage1D
</refentrytitle></citerefentry>,
83 <citerefentry><refentrytitle>glTexImage2D
</refentrytitle></citerefentry>,
84 <citerefentry><refentrytitle>glTexImage2DMultisample
</refentrytitle></citerefentry>,
85 <citerefentry><refentrytitle>glTexImage3D
</refentrytitle></citerefentry>,
86 <citerefentry><refentrytitle>glTexImage3DMultisample
</refentrytitle></citerefentry>,
87 <citerefentry><refentrytitle>glTexSubImage1D
</refentrytitle></citerefentry>,
88 <citerefentry><refentrytitle>glTexSubImage2D
</refentrytitle></citerefentry>,
89 <citerefentry><refentrytitle>glTexSubImage3D
</refentrytitle></citerefentry>,
90 <citerefentry><refentrytitle>glTexParameter
</refentrytitle></citerefentry>,
93 <refsect1 id=
"Copyright"><title>Copyright
</title>
95 Copyright
<trademark class=
"copyright"></trademark> 1991-
2006
96 Silicon Graphics, Inc. This document is licensed under the SGI
97 Free Software B License. For details, see
98 <ulink url=
"http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/
</ulink>.