            <code class="function">glUnmapBuffer</code> and
            <code class="function">glUnmapNamedBuffer</code> unmap (release) any
            mapping of a specified buffer object into the client's address
            space (see
            <a class="citerefentry" href="glMapBufferRange"><span class="citerefentry"><span class="refentrytitle">glMapBufferRange</span></span></a>
            and
            <a class="citerefentry" href="glMapBuffer"><span class="citerefentry"><span class="refentrytitl