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        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Not specifying user data for gluTessVertex causes NULL pointer to vertex callback."
   href="https://bugs.freedesktop.org/show_bug.cgi?id=56826">56826</a>
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>mesa-dev@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Not specifying user data for gluTessVertex causes NULL pointer to vertex callback.
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>noname+freedesktop@nurd.se
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86-64 (AMD64)
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>git
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>GLU
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>Mesa
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=69647" name="attach_69647" title="Reproduces bug in libtess.">attachment 69647</a> <a href="attachment.cgi?id=69647&action=edit" title="Reproduces bug in libtess.">[details]</a></span>
Reproduces bug in libtess.

Overview
When setting up a callback function for the polygon tesselator (libtess), the
received pointer (which should point to a vertex) is NULL if the third argument
(a pointer to user data) is NULL.

Steps to reproduce
  1) Create GLUtesselator object
  2) Specify a GLU_TESS_VERTEX or GLU_TESS_VERTEX_DATA callback
  3) Tessellate a polygon

  Or see attached file.

Actual results
Supplied vertex callback argument is NULL.

Expected results
Supplied vertex callback argument should point to valid vertex data.

Build Date & Platform
git 2012-11-06, Ubuntu Linux 12.04

Additional Information
Attached test which runs the tessellation in 2 runs, first with the user data
pointer set to a reference to a dummy integer (works), and then with the user
data pointer set to NULL (doesn't work).</pre>
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