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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glInvalidateBufferSubData">
    <info>
        <copyright>
            <year>2013</year>
            <holder>Khronos Group</holder>
        </copyright>
    </info>
    <refmeta>
        <refentrytitle>glInvalidateBufferSubData</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glInvalidateBufferSubData</refname>
        <refpurpose>invalidate a region of a buffer object's data store</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>void <function>glInvalidateBufferSubData</function></funcdef>
                <paramdef>GLuint <parameter>buffer</parameter></paramdef>
                <paramdef>GLintptr <parameter>offset</parameter></paramdef>
                <paramdef>GLsizeiptr <parameter>length</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <refsect1 xml:id="parameters"><title>Parameters</title>
        <variablelist>
        <varlistentry>
            <term><parameter>buffer</parameter></term>
            <listitem>
                <para>
                    The name of a buffer object, a subrange of whose data store to invalidate.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>offset</parameter></term>
            <listitem>
                <para>
                    The offset within the buffer's data store of the start of the range to be invalidated.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>length</parameter></term>
            <listitem>
                <para>
                    The length of the range within the buffer's data store to be invalidated.
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 xml:id="description"><title>Description</title>
        <para>
            <function>glInvalidateBufferSubData</function> invalidates all or part of the
            content of the data store of a buffer object. After invalidation, the content
            of the specified range of the buffer's data store becomes undefined. The
            start of the range is given by <parameter>offset</parameter> and its size
            is given by <parameter>length</parameter>, both measured in basic machine units.
        </para>
    </refsect1>
    <refsect1 xml:id="errors"><title>Errors</title>
        <para>
            <constant>GL_INVALID_VALUE</constant> is generated if <parameter>offset</parameter> or
            <parameter>length</parameter> is negative, or if <parameter>offset</parameter> +
            <parameter>length</parameter> is greater than the value of <constant>GL_BUFFER_SIZE</constant>
            for <parameter>buffer</parameter>.
        </para>
        <para>
            <constant>GL_INVALID_VALUE</constant> is generated if <parameter>buffer</parameter> is not the
            name of an existing buffer object.
        </para>
        <para>
            <constant>GL_INVALID_OPERATION</constant> is generated if any part of <parameter>buffer</parameter>
            is currently mapped.
        </para>
    </refsect1>
    <refsect1 xml:id="associatedgets"><title>Associated Gets</title>
        <para>
            <citerefentry><refentrytitle>glGetBufferParameter</refentrytitle></citerefentry> with argument <constant>GL_BUFFER_SIZE</constant>
        </para>
    </refsect1>
    <refsect1 xml:id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>glInvalidateTexSubImage</refentrytitle></citerefentry>,,
            <citerefentry><refentrytitle>glInvalidateTexImage</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>
