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169 lines
8.9 KiB
XML
169 lines
8.9 KiB
XML
<?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="glBindTexture">
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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>glBindTexture</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glBindTexture</refname>
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<refpurpose>bind a named texture to a texturing target</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>glBindTexture</function></funcdef>
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<paramdef>GLenum <parameter>target</parameter></paramdef>
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<paramdef>GLuint <parameter>texture</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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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>target</parameter></term>
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<listitem>
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<para>
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Specifies the target to which the texture is bound.
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Must be either
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<constant>GL_TEXTURE_1D</constant>,
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<constant>GL_TEXTURE_2D</constant>,
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<constant>GL_TEXTURE_3D</constant>, or
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<constant>GL_TEXTURE_CUBE_MAP</constant>.
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</para>
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</listitem>
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</varlistentry>
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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 the name of a texture.
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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>glBindTexture</function> lets you create or use a named texture. Calling <function>glBindTexture</function> with
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<parameter>target</parameter> set to
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<constant>GL_TEXTURE_1D</constant>, <constant>GL_TEXTURE_2D</constant>, <constant>GL_TEXTURE_3D</constant> or
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<constant>GL_TEXTURE_CUBE_MAP</constant> and <parameter>texture</parameter> set to the name
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of the new texture binds the texture name to the target.
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When a texture is bound to a target, the previous binding for that
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target is automatically broken.
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</para>
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<para>
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Texture names are unsigned integers. The value zero is reserved to
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represent the default texture for each texture target.
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Texture names and the corresponding texture contents are local to
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the shared display-list space (see <citerefentry><refentrytitle>glXCreateContext</refentrytitle></citerefentry>) of the current
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GL rendering context;
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two rendering contexts share texture names only if they
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also share display lists.
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</para>
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<para>
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You may use <citerefentry><refentrytitle>glGenTextures</refentrytitle></citerefentry> to generate a set of new texture names.
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</para>
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<para>
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When a texture is first bound, it assumes the specified target:
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A texture first bound to <constant>GL_TEXTURE_1D</constant> becomes one-dimensional texture, a
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texture first bound to <constant>GL_TEXTURE_2D</constant> becomes two-dimensional texture, a
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texture first bound to <constant>GL_TEXTURE_3D</constant> becomes three-dimensional texture, and a
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texture first bound to <constant>GL_TEXTURE_CUBE_MAP</constant>
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becomes a cube-mapped texture. The state of a one-dimensional texture
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immediately after it is first bound is equivalent to the state of the
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default <constant>GL_TEXTURE_1D</constant> at GL initialization, and similarly for two-
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and three-dimensional textures and cube-mapped textures.
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</para>
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<para>
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While a texture is bound, GL operations on the target to which it is
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bound affect the bound texture, and queries of the target to which it
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is bound return state from the bound texture. If texture mapping is active
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on the target to which a texture is bound, the bound texture is used.
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In effect, the texture targets become aliases for the textures currently
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bound to them, and the texture name zero refers to the default textures
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that were bound to them at initialization.
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</para>
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<para>
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A texture binding created with <function>glBindTexture</function> remains active until a different
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texture is bound to the same target, or until the bound texture is
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deleted with <citerefentry><refentrytitle>glDeleteTextures</refentrytitle></citerefentry>.
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</para>
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<para>
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Once created, a named texture may be re-bound to its same original target as often as needed.
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It is usually much faster to use <function>glBindTexture</function> to bind an existing named
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texture to one of the texture targets than it is to reload the texture image
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using <citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>, or <citerefentry><refentrytitle>glTexImage3D</refentrytitle></citerefentry>.
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For additional control over performance, use
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<citerefentry><refentrytitle>glPrioritizeTextures</refentrytitle></citerefentry>.
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</para>
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<para>
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<function>glBindTexture</function> is included in display lists.
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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>glBindTexture</function> is available only if the GL version is 1.1 or greater.
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</para>
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<para>
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<constant>GL_TEXTURE_CUBE_MAP</constant> is available only if the GL version is 1.3 or greater.
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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>target</parameter> is not one of the allowable
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values.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>texture</parameter> was previously created with a target
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that doesn't match that of <parameter>target</parameter>.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <function>glBindTexture</function> is executed
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between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry> and the corresponding
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execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.
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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_TEXTURE_BINDING_1D</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_TEXTURE_BINDING_2D</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_TEXTURE_BINDING_3D</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>glAreTexturesResident</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDeleteTextures</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGenTextures</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetTexParameter</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glIsTexture</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glPrioritizeTextures</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexImage2D</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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