Opentk/Source/Bind/Specifications/Docs/glBindTextures.xml

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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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<refentry id="glBindTextures">
    <refentryinfo>
        <copyright>
            <year>2013</year>
            <holder>Khronos Group</holder>
        </copyright>
    </refentryinfo>
    <refmeta>
        <refentrytitle>glBindTextures</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glBindTextures</refname>
        <refpurpose>bind one or more named textures to a sequence of consecutive texture units</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>void <function>glBindTextures</function></funcdef>
                <paramdef>GLuint <parameter>first</parameter></paramdef>
                <paramdef>GLsizei <parameter>count</parameter></paramdef>
                <paramdef>const GLuint *<parameter>textures</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <refsect1 id="parameters"><title>Parameters</title>
        <variablelist>
        <varlistentry>
            <term><parameter>first</parameter></term>
            <listitem>
                <para>
                    Specifies the first texture unit to which a texture is to be bound.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>count</parameter></term>
            <listitem>
                <para>
                    Specifies the number of textures to bind.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>textures</parameter></term>
            <listitem>
                <para>
                    Specifies the address of an array of names of existing texture objects.
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 id="description"><title>Description</title>
        <para>
            <function>glBindTextures</function> binds an array of existing texture objects to a specified
            number of consecutive texture units. <parameter>count</parameter> specifies the number of texture
            objects whose names are stored in the array <parameter>textures</parameter>. That number
            of texture names are read from the array and bound to the <parameter>count</parameter> consecutive
            texture units starting from <parameter>first</parameter>. The target, or type of texture is
            deduced from the texture object and each texture is bound to the corresponding target of the
            texture unit. If the name zero appears in the <parameter>textures</parameter> array, any existing binding
            to any target of the texture unit is reset and the default texture for that target is bound in
            its place. Any non-zero entry in <parameter>textures</parameter> must be the name of an existing
            texture object. If <parameter>textures</parameter> is <constant>NULL</constant> then it is as
            if an appropriately sized array containing only zeros had been specified.
        </para>
        <para>
            With the exception that the active texture selector maintains its current value,
            <function>glBindTextures</function> is equivalent to the following pseudo code:
        </para>
<programlisting><![CDATA[    for (i = 0; i < count; i++) {
        GLuint texture;
        if (textures == NULL) {
            texture = 0;
        } else {
            texture = textures[i];
        }
        glActiveTexture(GL_TEXTURE0 + first + i);
        if (texture != 0) {
            GLenum target = /* target of textures[i] */;
            glBindTexture(target, textures[i]);
        } else {
            for (target in all supported targets) {
                glBindTexture(target, 0);
            }
        }
    }]]></programlisting>
    <para>
        Each entry in <parameter>textures</parameter> will be checked individually and if found
        to be invalid, the state for that texture unit will not be changed and an error will be
        generated. However, the state for other texture units referenced by the command will still
        be updated.
    </para>
    </refsect1>
    <refsect1 id="notes"><title>Notes</title>
        <para>
            <function>glBindTextures</function> is available only if the GL version is 4.4 or higher.
        </para>
        <para>
            Note that because <function>glBindTextures</function> cannot create new textures (even if
            a name passed has been previously generated by call to <citerefentry><refentrytitle>glGenTextures</refentrytitle></citerefentry>),
            names pased to <function>glBindTextures</function> must have been bound at least once previously
            via a call to <citerefentry><refentrytitle>glBindTexture</refentrytitle></citerefentry>.
        </para>
    </refsect1>
    <refsect1 id="errors"><title>Errors</title>
        <para>
            <constant>GL_INVALID_OPERATION</constant> is generated if <parameter>first</parameter> + <parameter>count</parameter> is greater
            than the number of texture image units supported by the implementation.
        </para>
        <para>
            <constant>GL_INVALID_OPERATION</constant> is generated if any value in textures is
            not zero or the name of an existing texture object.
        </para>
    </refsect1>
    <refsect1 id="associatedgets"><title>Associated Gets</title>
        <para>
            <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_TEXTURE_BINDING_1D</constant>,
            <constant>GL_TEXTURE_BINDING_2D</constant>, <constant>GL_TEXTURE_BINDING_3D</constant>, <constant>GL_TEXTURE_BINDING_1D_ARRAY</constant>,
            <constant>GL_TEXTURE_BINDING_2D_ARRAY</constant>, <constant>GL_TEXTURE_BINDING_RECTANGLE</constant>,
            <constant>GL_TEXTURE_BINDING_BUFFER</constant>, <constant>GL_TEXTURE_BINDING_CUBE_MAP</constant>, <constant>GL_TEXTURE_BINDING_CUBE_MAP</constant>,
            <constant>GL_TEXTURE_BINDING_CUBE_MAP_ARRAY</constant>,
            <constant>GL_TEXTURE_BINDING_2D_MULTISAMPLE</constant>,
            or <constant>GL_TEXTURE_BINDING_2D_MULTISAMPLE_ARRAY</constant>.
        </para>
    </refsect1>
    <refsect1 id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>glBindTexture</refentrytitle></citerefentry>,
            <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>glTexImage1D</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glTexImage2DMultisample</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glTexImage3D</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glTexImage3DMultisample</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glTexBuffer</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glTexParameter</refentrytitle></citerefentry>
        </para>
    </refsect1>
    <refsect1 id="Copyright"><title>Copyright</title>
        <para>
            Copyright <trademark class="copyright"></trademark> 2013 Khronos Group.
            This material may be distributed subject to the terms and conditions set forth in 
            the Open Publication License, v 1.0, 8 June 1999.
            <ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
        </para>
    </refsect1>
</refentry>