span>
            buffers, and double-buffered contexts include both
            <span class="emphasis"><em>front</em></span>
            and
            <span class="emphasis"><em>back</em></span>
            buffers.
            The context is selected at GL initialization.
        </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p>
            <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>mode</code></em> is not an acce