t buffer.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p>
            If a buffer is not present,
            then a <code class="function">glClear</code> directed at that buffer has no effect.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p>
            <code class="constant">GL_INVALID_VALUE</code> is generated if any bit other than the three defined
            bits is set in <em class="parameter"><co