dd>
            <dt>
              <span class="term">
                <code class="constant">GL_PIXEL_BUFFER_BARRIER_BIT</code>
              </span>
            </dt>
            <dd>
              <p>
                        Reads and writes of buffer objects via the
                        <code class="constant">GL_PIXEL_PACK_BUFFER</code> and <code class="constant">GL_PIXEL_UNPACK_BUFFER</code>
                        bindings (via <a class="citerefentry" href="glReadPixels"><span class="citerefentry">