 level for the
            texture of the specified size, then a GLU error code is returned (see
            <a class="citerefentry" href="gluErrorString"><span class="citerefentry"><span class="refentrytitle">gluErrorString</span></span></a>) and nothing is loaded.
        </p><p>
            For example, if <em class="parameter"><code>level</code></em> is 2 and <em class="parameter"><code>width</code></em> is 16 and <em class="parameter"><code>height</code></em> is 8, the
            following levels are 