           Passing <code class="constant">GL_CCW</code> to <em class="parameter"><code>mode</code></em> selects counterclockwise polygons as
            front-facing;
            <code class="constant">GL_CW</code> selects clockwise polygons as front-facing.
            By default, counterclockwise polygons are taken to be front-facing.
        </p>
      </div>
      <div class="refsect1" id="errors">
        <h2>Errors</h2>
        <p>
            <code class="constant">GL_INVALID_ENUM</code> is generated