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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glInvalidateTexSubImage">
    <info>
        <copyright>
            <year>2013</year>
            <holder>Khronos Group</holder>
        </copyright>
    </info>
    <refmeta>
        <refentrytitle>glInvalidateTexSubImage</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glInvalidateTexSubImage</refname>
        <refpurpose>invalidate a region of a texture image</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>void <function>glInvalidateTexSubImage</function></funcdef>
                <paramdef>GLuint <parameter>texture</parameter></paramdef>
                <paramdef>GLint <parameter>level</parameter></paramdef>
                <paramdef>GLint <parameter>xoffset</parameter></paramdef>
                <paramdef>GLint <parameter>yoffset</parameter></paramdef>
                <paramdef>GLint <parameter>zoffset</parameter></paramdef>
                <paramdef>GLsizei <parameter>width</parameter></paramdef>
                <paramdef>GLsizei <parameter>height</parameter></paramdef>
                <paramdef>GLsizei <parameter>depth</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <refsect1 xml:id="parameters"><title>Parameters</title>
        <variablelist>
        <varlistentry>
            <term><parameter>texture</parameter></term>
            <listitem>
                <para>
                    The name of a texture object a subregion of which to invalidate.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>level</parameter></term>
            <listitem>
                <para>
                    The level of detail of the texture object within which the region resides.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>xoffset</parameter></term>
            <listitem>
                <para>
                    The X offset of the region to be invalidated.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>yoffset</parameter></term>
            <listitem>
                <para>
                    The Y offset of the region to be invalidated.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>zoffset</parameter></term>
            <listitem>
                <para>
                    The Z offset of the region to be invalidated.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>width</parameter></term>
            <listitem>
                <para>
                    The width of the region to be invalidated.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>height</parameter></term>
            <listitem>
                <para>
                    The height of the region to be invalidated.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>depth</parameter></term>
            <listitem>
                <para>
                    The depth of the region to be invalidated.
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 xml:id="description"><title>Description</title>
        <para>
            <function>glInvalidateTexSubImage</function> invalidates all or part of
            a texture image. <parameter>texture</parameter> and <parameter>level</parameter> indicated
            which texture image is being invalidated. After this command, data in that subregion have undefined
            values. <parameter>xoffset</parameter>, <parameter>yoffset</parameter>, <parameter>zoffset</parameter>, <parameter>width</parameter>, <parameter>height</parameter>, and <parameter>depth</parameter>
            are interpreted as they are in <citerefentry><refentrytitle>glTexSubImage3D</refentrytitle></citerefentry>. For texture targets that
            don't have certain dimensions, this command treats those dimensions as
            having a size of 1. For example, to invalidate a portion of a two-
            dimensional texture, the application would use <parameter>zoffset</parameter> equal to zero and
            <parameter>depth</parameter> equal to one. Cube map textures are treated as an array of six
            slices in the z-dimension, where a value of <parameter>zoffset</parameter> is interpreted as
            specifying face <constant>GL_TEXTURE_CUBE_MAP_POSITIVE_X</constant> + <parameter>zoffset</parameter>.
        </para>
        <para>
            <parameter>level</parameter> must be greater than or equal to zero and be
            less than the base 2 logarithm of the maximum texture width, height, or depth.
            <parameter>xoffset</parameter>, <parameter>yoffset</parameter> and <parameter>zoffset</parameter>
            must be greater than or equal to zero and be less than the width, height or depth
            of the image, respectively. Furthermore, <parameter>xoffset</parameter> + <parameter>width</parameter>,
            <parameter>yoffset</parameter> + <parameter>height</parameter>, and
            <parameter>zoffset</parameter> + <parameter>depth</parameter> must be less
            than or equal to the width, height or depth of the image, respectively.
        </para>
        <para>
            For textures of targets <constant>GL_TEXTURE_RECTANGLE</constant>, <constant>GL_TEXTURE_BUFFER</constant>, <constant>GL_TEXTURE_2D_MULTISAMPLE</constant>, or
            <constant>GL_TEXTURE_2D_MULTISAMPLE_ARRAY</constant>, level must be zero.
        </para>
    </refsect1>
    <refsect1 xml:id="errors"><title>Errors</title>
        <para>
            <constant>GL_INVALID_VALUE</constant> is generated if <parameter>xoffset</parameter>,
            <parameter>yoffset</parameter> or <parameter>zoffset</parameter> is less than zero,
            or if any of them is greater than the size of the image in the corresponding dimension.
        </para>
        <para>
            <constant>GL_INVALID_VALUE</constant> is generated if <parameter>level</parameter> is
            less than zero or if it is greater or equal to the base 2 logarithm of the maximum texture width, height, or depth.
        </para>
        <para>
            <constant>GL_INVALID_VALUE</constant> is generated if the target of <parameter>texture</parameter>
            is any of <constant>GL_TEXTURE_RECTANGLE</constant>, <constant>GL_TEXTURE_BUFFER</constant>, <constant>GL_TEXTURE_2D_MULTISAMPLE</constant>, or
            <constant>GL_TEXTURE_2D_MULTISAMPLE_ARRAY</constant> and <parameter>level</parameter> is not zero.
        </para>
        <para>
            <constant>GL_INVALID_VALUE</constant> is generated if <parameter>texture</parameter> is not the
            name of an existing texture object.
        </para>
    </refsect1>
    <refsect1 xml:id="associatedgets"><title>Associated Gets</title>
        <para>
            <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_MAX_TEXTURE_SIZE</constant>
        </para>
    </refsect1>
    <refsect1 xml:id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>glInvalidateTexImage</refentrytitle></citerefentry>,,
            <citerefentry><refentrytitle>glInvalidateBufferSubData</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glInvalidateBufferData</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glInvalidateFramebuffer</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glInvalidateSubFramebuffer</refentrytitle></citerefentry>.
        </para>
    </refsect1>
    <refsect1 xml:id="Copyright"><title>Copyright</title>
        <para>
            Copyright <trademark class="copyright"/> 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.
            <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://opencontent.org/openpub/">http://opencontent.org/openpub/</link>.
        </para>
    </refsect1>
</refentry>
