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<!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="glPatchParameter">
<info>
<copyright>
<year>2010-2014</year>
<holder>Khronos Group.</holder>
</copyright>
</info>
<refmeta>
<refentrytitle>glPatchParameter</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>glPatchParameter</refname>
<refpurpose>specifies the parameters for patch primitives</refpurpose>
</refnamediv>
<refsynopsisdiv><title>C Specification</title>
<funcsynopsis>
<funcprototype>
<funcdef>void <function>glPatchParameteri</function></funcdef>
<paramdef>GLenum <parameter>pname</parameter></paramdef>
<paramdef>GLint <parameter>value</parameter></paramdef>
</funcprototype>
</funcsynopsis>
<funcsynopsis>
<funcprototype>
<funcdef>void <function>glPatchParameterfv</function></funcdef>
<paramdef>GLenum <parameter>pname</parameter></paramdef>
<paramdef>const GLfloat *<parameter>values</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 xml:id="parameters"><title>Parameters</title>
<variablelist>
<varlistentry>
<term><parameter>pname</parameter></term>
<listitem>
<para>
Specifies the name of the parameter to set. The symbolc constants <constant>GL_PATCH_VERTICES</constant>,
<constant>GL_PATCH_DEFAULT_OUTER_LEVEL</constant>, and <constant>GL_PATCH_DEFAULT_INNER_LEVEL</constant> are accepted.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>value</parameter></term>
<listitem>
<para>
Specifies the new value for the parameter given by <parameter>pname</parameter>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>values</parameter></term>
<listitem>
<para>
Specifies the address of an array containing the new values for the parameter given by <parameter>pname</parameter>.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 xml:id="description"><title>Description</title>
<para>
<function>glPatchParameter</function> specifies the parameters that will be used for patch primitives. <parameter>pname</parameter>
specifies the parameter to modify and must be either <constant>GL_PATCH_VERTICES</constant>, <constant>GL_PATCH_DEFAULT_OUTER_LEVEL</constant>
or <constant>GL_PATCH_DEFAULT_INNER_LEVEL</constant>. For <function>glPatchParameteri</function>, <parameter>value</parameter> specifies
the new value for the parameter specified by <parameter>pname</parameter>. For <function>glPatchParameterfv</function>, <parameter>values</parameter>
specifies the address of an array containing the new values for the parameter specified by <parameter>pname</parameter>.
</para>
<para>
When <parameter>pname</parameter> is <constant>GL_PATCH_VERTICES</constant>, <parameter>value</parameter> specifies the number
of vertices that will be used to make up a single patch primitive. Patch primitives are consumed by the tessellation control
shader (if present) and subsequently used for tessellation. When primitives are specified using
<citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry> or a similar function, each patch will be made
from <parameter>parameter</parameter> control points, each represented by a vertex taken from the enabeld vertex arrays.
<parameter>parameter</parameter> must be greater than zero, and less than or equal to the value of <constant>GL_MAX_PATCH_VERTICES</constant>.
</para>
<para>
When <parameter>pname</parameter> is <constant>GL_PATCH_DEFAULT_OUTER_LEVEL</constant> or <constant>GL_PATCH_DEFAULT_INNER_LEVEL</constant>,
<parameter>values</parameter> contains the address of an array contiaining the default outer or inner tessellation levels, respectively,
to be used when no tessellation control shader is present.
</para>
</refsect1>
<refsect1 xml:id="errors"><title>Errors</title>
<para>
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>pname</parameter> is not an accepted value.
</para>
<para>
<constant>GL_INVALID_VALUE</constant> is generated if <parameter>pname</parameter> is <constant>GL_PATCH_VERTICES</constant>
and <parameter>value</parameter> is less than or equal to zero, or greater than the value of <constant>GL_MAX_PATCH_VERTICES</constant>.
</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="apifunchead.xml" xpointer="xpointer(/*/*)"/>
<tbody>
<row>
<entry><function>glPatchParameterfv</function></entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='40']/*)"/>
</row>
<row>
<entry><function>glPatchParameteri</function></entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='40']/*)"/>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 xml:id="seealso"><title>See Also</title>
<para>
<citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glDrawArraysInstanced</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry>,
</para>
</refsect1>
<refsect1 xml:id="Copyright"><title>Copyright</title>
<para>
Copyright <trademark class="copyright"/> 2010-2014 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>
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