</code>,
                    <code class="constant">GL_AND_INVERTED</code>,
                    <code class="constant">GL_OR_REVERSE</code>, and
                    <code class="constant">GL_OR_INVERTED</code>. The initial value is <code class="constant">GL_COPY</code>.
                </p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1" id="description">
        <h2>Description</h2>
        <p>
            <code class="function">glLogicOp</code> specifies a logical