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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glClearBufferSubData">
    <info>
        <copyright>
            <year>2013</year>
            <holder>Khronos Group</holder>
        </copyright>
    </info>
    <refmeta>
        <refentrytitle>glClearBufferSubData</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glClearBufferSubData</refname>
        <refpurpose>fill all or part of buffer object's data store with a fixed value</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>void <function>glClearBufferSubData</function></funcdef>
                <paramdef>GLenum <parameter>target</parameter></paramdef>
                <paramdef>GLenum <parameter>internalformat</parameter></paramdef>
                <paramdef>GLintptr <parameter>offset</parameter></paramdef>
                <paramdef>GLsizeiptr <parameter>size</parameter></paramdef>
                <paramdef>GLenum <parameter>format</parameter></paramdef>
                <paramdef>GLenum <parameter>type</parameter></paramdef>
                <paramdef>const void * <parameter>data</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <refsect1 xml:id="parameters"><title>Parameters</title>
        <variablelist>
        <varlistentry>
            <term><parameter>target</parameter></term>
            <listitem>
                <para>
                    Specify the target of the operation. <parameter>target</parameter> must be
                    one of the global buffer binding targets.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>internalformat</parameter></term>
            <listitem>
                <para>
                    The internal format with which the data will be stored in the buffer object.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>offset</parameter></term>
            <listitem>
                <para>
                    The offset, in basic machine units into the buffer object's data store at which to start filling.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>size</parameter></term>
            <listitem>
                <para>
                    The size, in basic machine units of the range of the data store to fill.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>format</parameter></term>
            <listitem>
                <para>
                    The format of the data in memory addressed by <parameter>data</parameter>.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>type</parameter></term>
            <listitem>
                <para>
                    The type of the data in memory addressed by <parameter>data</parameter>.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>data</parameter></term>
            <listitem>
                <para>
                    The address of a memory location storing the data to be replicated into the
                    buffer's data store.
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 xml:id="description"><title>Description</title>
        <para>
            <function>glClearBufferSubData</function> fills a specified region of a buffer object's
            data store with data from client memory. <parameter>offset</parameter> and <parameter>size</parameter>
            demark the extent of the region within the data store of the buffer object bound to
            <parameter>target</parameter> to fill with data. Data, initially supplied in a format
            specified by <parameter>format</parameter> in data type <parameter>type</parameter> is
            read from the memory address given by <parameter>data</parameter> and converted into
            the internal representation given by <parameter>internalforamt</parameter>.
            This converted data is then replicated throughout the specified region of the buffer object's
            data store.
        </para>
        <para>
            If <parameter>data</parameter> is NULL, then the subrange of the buffer's data store
            is filled with zeros.
        </para>
    </refsect1>
    <refsect1 xml:id="errors"><title>Errors</title>
        <para>
            <constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> not one of the generic buffer binding targets.
        </para>
        <para>
            <constant>GL_INVALID_VALUE</constant> is generated if no buffer is bound to <parameter>target</parameter>.
        </para>
        <para>
            <constant>GL_INVALID_ENUM</constant> is generated if <parameter>internalformat</parameter> is not a sized internal format.
        </para>
        <para>
            <constant>GL_INVALID_VALUE</constant> is generated if <parameter>offset</parameter> or <parameter>range</parameter> are not multiples of
            the number of basic machine units per-element for the internal format specified by
            <parameter>internalformat</parameter>.
        </para>
        <para>
            <constant>GL_INVALID_VALUE</constant> is generated if <parameter>offset</parameter> or <parameter>size</parameter> is less than zero, or if
            <parameter>offset</parameter> + <parameter>size</parameter> is greater than the value of <constant>GL_BUFFER_SIZE</constant> for the buffer bound to <parameter>target</parameter>.
        </para>
        <para>
            <constant>GL_INVALID_OPERATION</constant> is generated if any part of the specified buffer range is
            mapped with <citerefentry><refentrytitle>glMapBufferRange</refentrytitle></citerefentry> or <citerefentry><refentrytitle>glMapBuffer</refentrytitle></citerefentry>.
        </para>
    </refsect1>
    <refsect1 xml:id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>glClearBufferData</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>
