    <div class="refentry" id="gl_ClipDistance">
      <div class="titlepage"></div>
      <div class="refnamediv">
        <h2>Name</h2>
        <p>gl_ClipDistance — provides a forward-compatible mechanism for vertex clipping</p>
      </div>
      <div class="refsynopsisdiv">
        <h2>Declaration</h2>
        <p>
            <code class="varname">gl_ClipDistance</code> is a member of the
            <code class="varname">gl_PerVertex</code> named block:
        </p>
        <pre class="programlisting"