Opentk/Source/Bind/Specifications/Docs/ES20/glBindTexture.xml

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<refentry id="glBindTexture">
    <refmeta>
        <refmetainfo>
            <copyright>
                <year>1991-2006</year>
                <holder>Silicon Graphics, Inc.</holder>
            </copyright>
        </refmetainfo>
        <refentrytitle>glBindTexture</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glBindTexture</refname>
        <refpurpose>bind a named texture to a texturing target</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>void <function>glBindTexture</function></funcdef>
                <paramdef>GLenum <parameter>target</parameter></paramdef>
                <paramdef>GLuint <parameter>texture</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <refsect1 id="parameters"><title>Parameters</title>
        <variablelist>
        <varlistentry>
            <term><parameter>target</parameter></term>
            <listitem>
                <para>
                    Specifies the target of the active texture unit to which the texture is bound.
                    Must be either
                    <constant>GL_TEXTURE_2D</constant> or
                    <constant>GL_TEXTURE_CUBE_MAP</constant>.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>texture</parameter></term>
            <listitem>
                <para>
                    Specifies the name of a texture.
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 id="description"><title>Description</title>
        <para>
            <function>glBindTexture</function> lets you create or use a named texture. Calling <function>glBindTexture</function> with
            <parameter>target</parameter> set to
            <constant>GL_TEXTURE_2D</constant> or
            <constant>GL_TEXTURE_CUBE_MAP</constant> and <parameter>texture</parameter> set to the name
            of the new texture binds the texture name to the target of the current active texture unit.
            When a texture is bound to a target, the previous binding for that
            target is automatically broken.
        </para>
        <para>
            Texture names are unsigned integers. The value zero is reserved to
            represent the default texture for each texture target.
            Texture names and the corresponding texture contents are local to
            the shared object space of the current GL rendering context.
        </para>
        <para>
            You may use <citerefentry><refentrytitle>glGenTextures</refentrytitle></citerefentry> to generate a set of new texture names.
        </para>
        <para>
            When a texture is first bound, it assumes the specified target:
            A texture first bound to <constant>GL_TEXTURE_2D</constant> becomes a two-dimensional texture and a
            texture first bound to <constant>GL_TEXTURE_CUBE_MAP</constant>
            becomes a cube-mapped texture. The state of a two-dimensional texture
            immediately after it is first bound is equivalent to the state of the
            default <constant>GL_TEXTURE_2D</constant> at GL initialization, and similarly for cube-mapped textures.
        </para>
        <para>
            While a texture is bound, GL operations on the target to which it is
            bound affect the bound texture, and queries of the target to which it
            is bound return state from the bound texture. 
            In effect, the texture targets become aliases for the textures currently
            bound to them, and the texture name zero refers to the default textures
            that were bound to them at initialization.
        </para>
        <para>
            A texture binding created with <function>glBindTexture</function> remains active until a different
            texture is bound to the same target, or until the bound texture is
            deleted with <citerefentry><refentrytitle>glDeleteTextures</refentrytitle></citerefentry>.
        </para>
        <para>
            Once created, a named texture may be re-bound to its same original target as often as needed.
            It is usually much faster to use <function>glBindTexture</function> to bind an existing named
            texture to one of the texture targets than it is to reload the texture image
            using <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>.
        </para>
    </refsect1>
    <refsect1 id="errors"><title>Errors</title>
        <para>
            <constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> is not one of the allowable
            values.
        </para>
        <para>
            <constant>GL_INVALID_OPERATION</constant> is generated if <parameter>texture</parameter> was previously created with a target
            that doesn't match that of <parameter>target</parameter>.
        </para>
    </refsect1>
    <refsect1 id="associatedgets"><title>Associated Gets</title>
        <para>
            <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_TEXTURE_BINDING_2D</constant> or <constant>GL_TEXTURE_BINDING_CUBE_MAP</constant>
        </para>
    </refsect1>
    <refsect1 id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>glDeleteTextures</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glGenTextures</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glGetTexParameter</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glIsTexture</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glTexImage2D</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>