nipulate the name stack between the execution of
            <a class="citerefentry" href="glBegin"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a> and the corresponding execution of <a class="citerefentry" href="glEnd"><span class="citerefentry"><span class="refentrytitle">glEnd</span></span></a>.
            In any of these cases, the error flag is set and no other change is
            made to GL state.
        </p><p>
            The name stack is always empty while the 