rs; however, it is guaranteed that none of the returned names
            was in use immediately before the call to <code class="function">glGenRenderbuffers</code>.
        </p><p>
            Renderbuffer object names returned by a call to <code class="function">glGenRenderbuffers</code> are not returned by subsequent calls, unless
            they are first deleted with <a class="citerefentry" href="glDeleteRenderbuffers"><span class="citerefentry"><span class="refentrytitle">glDeleteRenderbuffers</span>