all <a class="citerefentry" href="glGet"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MAX_CLIP_PLANES</code>.
    All implementations support at least one such clipping plane. Because the
    resulting clipping region is the intersection of the defined half-spaces,
    it is always convex.</p><p><code class="function">glClipPlane</code> specifies a half-space using a
    four-component plane equation. When <code class="function">glCli