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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glGenerateMipmap">
    <info>
        <copyright>
            <year>2010-2014</year>
            <holder>Khronos Group</holder>
        </copyright>
    </info>
    <refmeta>
        <refentrytitle>glGenerateMipmap</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glGenerateMipmap</refname>
        <refpurpose>generate mipmaps for a specified texture target</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>void <function>glGenerateMipmap</function></funcdef>
                <paramdef>GLenum <parameter>target</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <refsect1 xml:id="parameters"><title>Parameters</title>
        <variablelist>
        <varlistentry>
            <term><parameter>target</parameter></term>
            <listitem>
                <para>
                    Specifies the target to which the texture whose mimaps to generate is bound. <parameter>target</parameter> must
                    be <constant>GL_TEXTURE_2D</constant>, <constant>GL_TEXTURE_3D</constant>,
                    <constant>GL_TEXTURE_2D_ARRAY</constant> or <constant>GL_TEXTURE_CUBE_MAP</constant>.
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 xml:id="description"><title>Description</title>
        <para>
            <function>glGenerateMipmap</function> generates mipmaps for the texture attached
            to <parameter>target</parameter> of the active texture unit. For cube map textures,
            a <constant>GL_INVALID_OPERATION</constant> error is generated if the texture
            attached to <parameter>target</parameter> is not cube complete.
        </para>
        <para>
            Mipmap generation replaces texel array levels
            <inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                <!-- eqn: level sub base  +  1: -->
                <mml:mrow>
                    <mml:msub>
                        <mml:mi mathvariant="italic">level</mml:mi>
                        <mml:mi>base</mml:mi>
                    </mml:msub>
                    <mml:mo>+</mml:mo>
                    <mml:mn>1</mml:mn>
                </mml:mrow>
            </mml:math></inlineequation>
            through
            <inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                <mml:mrow>
                    <mml:mi mathvariant="italic">q</mml:mi>
                </mml:mrow>
            </mml:math></inlineequation>
            with arrays derived from the
            <inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                <!-- eqn: level sub base  +  1: -->
                <mml:mrow>
                    <mml:msub>
                        <mml:mi mathvariant="italic">level</mml:mi>
                        <mml:mi>base</mml:mi>
                    </mml:msub>
                </mml:mrow>
            </mml:math></inlineequation>
            array, regardless of their previous contents. All other mimap arrays,
            including the
            <inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                <!-- eqn: level sub base  +  1: -->
                <mml:mrow>
                    <mml:msub>
                        <mml:mi mathvariant="italic">level</mml:mi>
                        <mml:mi>base</mml:mi>
                    </mml:msub>
                </mml:mrow>
            </mml:math></inlineequation>
            array, are left unchanged by this computation.
        </para>
        <para>
            The internal formats of the derived mipmap arrays all match those of the
            <inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                <!-- eqn: level sub base  +  1: -->
                <mml:mrow>
                    <mml:msub>
                        <mml:mi mathvariant="italic">level</mml:mi>
                        <mml:mi>base</mml:mi>
                    </mml:msub>
                </mml:mrow>
            </mml:math></inlineequation>
            array. The contents of the derived arrays are computed by repeated, filtered
            reduction of the
            <inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                <!-- eqn: level sub base  +  1: -->
                <mml:mrow>
                    <mml:msub>
                        <mml:mi mathvariant="italic">level</mml:mi>
                        <mml:mi>base</mml:mi>
                    </mml:msub>
                </mml:mrow>
            </mml:math></inlineequation>
            array. For two-dimensional texture arrays, each layer is filtered
            independently.
        </para>
    </refsect1>
    <refsect1 xml:id="errors"><title>Errors</title>
        <para>
            <constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> is not
            one of the accepted texture targets.
        </para>
        <para>
            <constant>GL_INVALID_OPERATION</constant> is generated if <parameter>target</parameter> is
            <constant>GL_TEXTURE_CUBE_MAP</constant> and the texture bound to the <constant>GL_TEXTURE_CUBE_MAP</constant>
            target of the active texture unit is not cube complete.
        </para>
        <para>
            <constant>GL_INVALID_OPERATION</constant> is generated if the
                        <inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                <!-- eqn: level sub base: -->
                <mml:mrow>
                    <mml:msub>
                        <mml:mi mathvariant="italic">level</mml:mi>
                        <mml:mi>base</mml:mi>
                    </mml:msub>
                </mml:mrow>
            </mml:math></inlineequation>
                        array is stored in a compressed internal format.
        </para>
        <para>
            <constant>GL_INVALID_OPERATION</constant> is generated if the
                        <inlineequation><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
                <!-- eqn: level sub base: -->
                <mml:mrow>
                    <mml:msub>
                        <mml:mi mathvariant="italic">level</mml:mi>
                        <mml:mi>base</mml:mi>
                    </mml:msub>
                </mml:mrow>
            </mml:math></inlineequation>
                        array was not specified with an unsized internal format or a sized internal format that is both
                        color-renderable and texture-filterable.
        </para>
    </refsect1>
    <refsect1 xml:id="versions">
        <title>API Version Support</title>
        <informaltable>
            <tgroup cols="3" align="left">
                <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apifunchead.xml" xpointer="xpointer(/*/*)"/>
                <tbody>
                    <row>
                        <entry>glGenerateMipmap</entry>
                        <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='es20']/*)"/>
                    </row>
                </tbody>
            </tgroup>
        </informaltable>
    </refsect1>
    <refsect1 xml:id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glBindTexture</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glGenTextures</refentrytitle></citerefentry>
        </para>
    </refsect1>
    <refsect1 xml:id="Copyright"><title>Copyright</title>
        <para>
            Copyright <trademark class="copyright"/> 2010-2014 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.
            <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://opencontent.org/openpub/">http://opencontent.org/openpub/</link>.
        </para>
    </refsect1>
</refentry>
