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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glMultiDrawElementsBaseVertex">
    <info>
        <copyright>
            <year>2010-2013</year>
            <holder>Khronos Group</holder>
        </copyright>
    </info>
    <refmeta>
        <refentrytitle>glMultiDrawElementsBaseVertex</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glMultiDrawElementsBaseVertex</refname>
        <refpurpose>render multiple sets of primitives by specifying indices of array data elements and an index to apply to each index</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>void <function>glMultiDrawElementsBaseVertex</function></funcdef>
                <paramdef>GLenum <parameter>mode</parameter></paramdef>
                <paramdef>const GLsizei *<parameter>count</parameter></paramdef>
                <paramdef>GLenum <parameter>type</parameter></paramdef>
                <paramdef>const GLvoid * const *<parameter>indices</parameter></paramdef>
                <paramdef>GLsizei <parameter>drawcount</parameter></paramdef>
                <paramdef>const GLint *<parameter>basevertex</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <refsect1 xml:id="parameters"><title>Parameters</title>
        <variablelist>
        <varlistentry>
            <term><parameter>mode</parameter></term>
            <listitem>
                <para>
                    Specifies what kind of primitives to render.
                    Symbolic constants
                    <constant>GL_POINTS</constant>,
                    <constant>GL_LINE_STRIP</constant>,
                    <constant>GL_LINE_LOOP</constant>,
                    <constant>GL_LINES</constant>,
                    <constant>GL_LINE_STRIP_ADJACENCY</constant>,
                    <constant>GL_LINES_ADJACENCY</constant>,
                    <constant>GL_TRIANGLE_STRIP</constant>,
                    <constant>GL_TRIANGLE_FAN</constant>,
                    <constant>GL_TRIANGLES</constant>,
                    <constant>GL_TRIANGLE_STRIP_ADJACENCY</constant>,
                    <constant>GL_TRIANGLES_ADJACENCY</constant> and <constant>GL_PATCHES</constant>
                    are accepted.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>count</parameter></term>
            <listitem>
                <para>
                    Points to an array of the elements counts.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>type</parameter></term>
            <listitem>
                <para>
                    Specifies the type of the values in <parameter>indices</parameter>. Must be one of
                    <constant>GL_UNSIGNED_BYTE</constant>, <constant>GL_UNSIGNED_SHORT</constant>, or
                    <constant>GL_UNSIGNED_INT</constant>.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>indices</parameter></term>
            <listitem>
                <para>
                    Specifies a pointer to the location where the indices are stored.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>drawcount</parameter></term>
            <listitem>
                <para>
                    Specifies the size of the <parameter>count</parameter>, <parameter>indices</parameter> and <parameter>basevertex</parameter> arrays.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>basevertex</parameter></term>
            <listitem>
                <para>
                    Specifies a pointer to the location where the base vertices are stored.
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 xml:id="description"><title>Description</title>
        <para>
            <function>glMultiDrawElementsBaseVertex</function> behaves identically to <citerefentry><refentrytitle>glDrawElementsBaseVertex</refentrytitle></citerefentry>,
            except that <parameter>drawcount</parameter> separate lists of elements are specifried instead.
        </para>
        <para>
        It has the same effect as:
        <programlisting>    for (int i = 0; i &lt; <parameter>drawcount</parameter>; i++)
        if (<parameter>count</parameter>[i] &gt; 0)
            glDrawElementsBaseVertex(<parameter>mode</parameter>,
                                     <parameter>count</parameter>[i],
                                     <parameter>type</parameter>,
                                     <parameter>indices[i]</parameter>,
                                     <parameter>basevertex[i]</parameter>);</programlisting>
        </para>
    </refsect1>
    <refsect1 xml:id="notes"><title>Notes</title>
        <para>
            <function>glMultiDrawElementsBaseVertex</function> is available only if the GL version is 3.1 or greater.
        </para>
        <para>
            <constant>GL_LINE_STRIP_ADJACENCY</constant>,
            <constant>GL_LINES_ADJACENCY</constant>,
            <constant>GL_TRIANGLE_STRIP_ADJACENCY</constant> and
            <constant>GL_TRIANGLES_ADJACENCY</constant>
            are available only if the GL version is 3.2 or greater.
        </para>
    </refsect1>
    <refsect1 xml:id="errors"><title>Errors</title>
        <para>
            <constant>GL_INVALID_ENUM</constant> is generated if <parameter>mode</parameter> is not an accepted value.
        </para>
        <para>
            <constant>GL_INVALID_VALUE</constant> is generated if <parameter>drawcount</parameter> is negative.
        </para>
        <para>
            <constant>GL_INVALID_OPERATION</constant> is generated if a non-zero buffer object name is bound to an
            enabled array or the element array and the buffer object's data store is currently mapped.
        </para>
    </refsect1>
    <refsect1 xml:id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>glMultiDrawElements</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glDrawElementsBaseVertex</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glVertexAttribPointer</refentrytitle></citerefentry>
        </para>
    </refsect1>
    <refsect1 xml:id="Copyright"><title>Copyright</title>
        <para>
            Copyright <trademark class="copyright"/> 2010 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>
