1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
<!DOCTYPE refentry [ <!ENTITY % mathent SYSTEM "math.ent"> %mathent; ]>
<!-- Converted by db4-upgrade version 1.1 -->
<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="gl_TessLevelOuter">
<info>
<copyright>
<year>2011-2014</year>
<holder>Khronos Group</holder>
</copyright>
</info>
<refmeta>
<refentrytitle>gl_TessLevelOuter</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>gl_TessLevelOuter</refname>
<refpurpose>contains the outer tessellation levels for the current patch</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Declaration</title>
<para>
<programlisting>// In tessellation control shaders</programlisting>
<fieldsynopsis>
<modifier>out</modifier>
<type>float</type>
<varname>gl_TessLevelOuter[4]</varname>
</fieldsynopsis>
</para>
<para>
<programlisting>// In tessellation evaluation shaders</programlisting>
<fieldsynopsis>
<modifier>in</modifier>
<type>float</type>
<varname>gl_TessLevelOuter[4]</varname>
</fieldsynopsis>
</para>
</refsynopsisdiv>
<refsect1 xml:id="description"><title>Description</title>
<para>
Available only in the tessellation control and evaluation languages, <varname>gl_TessLevelOuter</varname>
is used to assign values to the corresponding outer tesellation levels of the current patch. The values written
into <varname>gl_TessLevelOuter</varname> 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.
</para>
<para>
As inputs to the tessellation evaluation shader, <varname>gl_TessLevelOuter</varname> contains the values
written by the tessellation control shader, if present. If no tessellation control shader is present, it
contains the default tessellation level.
</para>
</refsect1>
<refsect1 xml:id="versions"><title>Version Support</title>
<informaltable>
<tgroup cols="13" align="left">
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="funchead.xml" xpointer="xpointer(/*/*)"/>
<tbody>
<row>
<entry>gl_TessLevelOuter</entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="version.xml" xpointer="xpointer(/*/*[@role='40']/*)"/>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 xml:id="seealso"><title>See Also</title>
<para>
<citerefentry><refentrytitle>gl_TessLevelInner</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>gl_TessCoord</refentrytitle></citerefentry>
</para>
</refsect1>
<refsect1 xml:id="Copyright"><title>Copyright</title>
<para>
Copyright <trademark class="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.
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://opencontent.org/openpub/">http://opencontent.org/openpub/</link>.
</para>
</refsect1>
</refentry>
|
