<div class="refentry" id="gl_TessLevelOuter">

<div class="titlepage"></div>

<div class="refnamediv">

<h2>Name</h2>

<p>gl_TessLevelOuter — contains the outer tessellation levels for the current patch</p>

</div>

<div class="refsynopsisdiv">

<h2>Declaration</h2>

<p>

</p>

<pre class="programlisting">// In tessellation control shaders</pre>

<p>

<code class="fieldsynopsis"><span class="modifier">out </span><span class="type">float </span><span class="varname">gl_TessLevelOuter[4] </span>;</code>

</p>

<p>

</p>

<pre class="programlisting">// In tessellation evaluation shaders</pre>

<p>

<code class="fieldsynopsis"><span class="modifier">in </span><span class="type">float </span><span class="varname">gl_TessLevelOuter[4] </span>;</code>

</p>

</div>

<div class="refsect1" id="description">

<h2>Description</h2>

<p>

Available only in the tessellation control and evaluation languages, <code class="varname">gl_TessLevelOuter</code>

is used to assign values to the corresponding outer tesellation levels of the current patch. The values written

into <code class="varname">gl_TessLevelOuter</code> by the tessellation control shader are used by the tessellation

primitive generator to control primitive tessellation and may be read by the subsequent tessellation evaluation shader.

</p>

<p>

As inputs to the tessellation evaluation shader, <code class="varname">gl_TessLevelOuter</code> contains the values

written by the tessellation control shader, if present. If no tessellation control shader is present, it

contains the default tessellation level.

</p>

</div>

{$pipelinestall}{$examples}

<div class="refsect1" id="versions">

<h2>Version Support</h2>

<div class="informaltable">

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<col style="text-align: center; " class="firstvers"/>

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<col style="text-align: center; "/>

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<col style="text-align: center; "/>

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<col style="text-align: center; "/>

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<col style="text-align: center; "/>

<col style="text-align: center; " class="lastvers"/>

</colgroup>

<thead>

<tr>

<th style="text-align: left; border-right: 2px solid ; ">

</th>

<th style="text-align: center; border-bottom: 2px solid ; " colspan="12">

<span class="bold"><strong>OpenGL Shading Language Version</strong></span>

</th>

</tr>

<tr>

<th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>Function Name</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>1.10</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>1.20</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>1.30</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>1.40</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>1.50</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>3.30</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>4.00</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>4.10</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>4.20</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>4.30</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>4.40</strong></span>

</th>

<th style="text-align: center; border-bottom: 2px solid ; ">

<span class="bold"><strong>4.50</strong></span>

</th>

</tr>

</thead>

<tbody>

<tr>

<td style="text-align: left; border-right: 2px solid ; ">gl_TessLevelOuter</td>

<td style="text-align: center; border-right: 2px solid ; ">-</td>

<td style="text-align: center; border-right: 2px solid ; ">-</td>

<td style="text-align: center; border-right: 2px solid ; ">-</td>

<td style="text-align: center; border-right: 2px solid ; ">-</td>

<td style="text-align: center; border-right: 2px solid ; ">-</td>

<td style="text-align: center; border-right: 2px solid ; ">-</td>

<td style="text-align: center; border-right: 2px solid ; ">✔</td>

<td style="text-align: center; border-right: 2px solid ; ">✔</td>

<td style="text-align: center; border-right: 2px solid ; ">✔</td>

<td style="text-align: center; border-right: 2px solid ; ">✔</td>

<td style="text-align: center; border-right: 2px solid ; ">✔</td>

<td style="text-align: center; ">✔</td>

</tr>

</tbody>

</table>

</div>

</div>

<div class="refsect1" id="seealso">

<h2>See Also</h2>

<p>

<a class="citerefentry" href="gl_TessLevelInner"><span class="citerefentry"><span class="refentrytitle">gl_TessLevelInner</span></span></a>,

<a class="citerefentry" href="gl_TessCoord"><span class="citerefentry"><span class="refentrytitle">gl_TessCoord</span></span></a>

</p>

</div>

<div class="refsect1" id="Copyright">

<h2>Copyright</h2>

<p>

Copyright © 2011-2014 Khronos Group.

This material may be distributed subject to the terms and conditions set forth in

the Open Publication License, v 1.0, 8 June 1999.

<a class="link" href="https://opencontent.org/openpub/" target="_top">https://opencontent.org/openpub/</a>.

</p>

</div>

</div>