> or <code class="constant">GLU_UNSIGNED_SHORT_5_6_5_REV</code>
            and <em class="parameter"><code>format</code></em> is not <code class="constant">GLU_RGB</code>.
        </p><p>
            <code class="constant">GLU_INVALID_OPERATION</code> is returned if <em class="parameter"><code>type</code></em> is <code class="constant">GLU_UNSIGNED_SHORT_4_4_4_4</code> or <code class="constant">GLU_UNSIGNED_SHORT_4_4_4_4_REV</code>
            and <em class="parameter"><code>format</code></em> is neither <