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113 lines
6.1 KiB
XML
113 lines
6.1 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="glPatchParameter">
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<refmeta>
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<refmetainfo>
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<copyright>
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<year>2010</year>
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<holder>Khronos Group.</holder>
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</copyright>
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</refmetainfo>
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<refentrytitle>glPatchParameter</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glPatchParameter</refname>
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<refpurpose>specifies the parameters for patch primitives</refpurpose>
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</refnamediv>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glPatchParameteri</function></funcdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>GLint <parameter>value</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glPatchParameterfv</function></funcdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>const GLfloat *<parameter>values</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<!-- eqn: ignoring delim $$ -->
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>pname</parameter></term>
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<listitem>
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<para>
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Specifies the name of the parameter to set. The symbolc constants <constant>GL_PATCH_VERTICES</constant>,
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<constant>GL_PATCH_DEFAULT_OUTER_LEVEL</constant>, and <constant>GL_PATCH_DEFAULT_INNER_LEVEL</constant> are accepted.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>value</parameter></term>
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<listitem>
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<para>
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Specifies the new value for the parameter given by <parameter>pname</parameter>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>values</parameter></term>
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<listitem>
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<para>
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Specifies the address of an array containing the new values for the parameter given by <parameter>pname</parameter>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="description"><title>Description</title>
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<para>
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<function>glPatchParameter</function> specifies the parameters that will be used for patch primitives. <parameter>pname</parameter>
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specifies the parameter to modify and must be either <constant>GL_PATCH_VERTICES</constant>, <constant>GL_PATCH_DEFAULT_OUTER_LEVEL</constant>
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or <constant>GL_PATCH_DEFAULT_INNER_LEVEL</constant>. For <function>glPatchParameteri</function>, <parameter>value</parameter> specifies
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the new value for the parameter specified by <parameter>pname</parameter>. For <function>glPatchParameterfv</function>, <parameter>values</parameter>
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specifies the address of an array containing the new values for the parameter specified by <parameter>pname</parameter>.
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</para>
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<para>
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When <parameter>pname</parameter> is <constant>GL_PATCH_VERTICES</constant>, <parameter>value</parameter> specifies the number
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of vertices that will be used to make up a single patch primitive. Patch primitives are consumed by the tessellation control
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shader (if present) and subsequently used for tessellation. When primitives are specified using
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<citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry> or a similar function, each patch will be made
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from <parameter>parameter</parameter> control points, each represented by a vertex taken from the enabeld vertex arrays.
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<parameter>parameter</parameter> must be greater than zero, and less than or equal to the value of <constant>GL_MAX_PATCH_VERTICES</constant>.
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</para>
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<para>
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When <parameter>pname</parameter> is <constant>GL_PATCH_DEFAULT_OUTER_LEVEL</constant> or <constant>GL_PATCH_DEFAULT_INNER_LEVEL</constant>,
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<parameter>values</parameter> contains the address of an array contiaining the default outer or inner tessellation levels, respectively,
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to be used when no tessellation control shader is present.
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</para>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>pname</parameter> is not an accepted value.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>pname</parameter> is <constant>GL_PATCH_VERTICES</constant>
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and <parameter>value</parameter> is less than or equal to zero, or greater than the value of <constant>GL_MAX_PATCH_VERTICES</constant>.
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</para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawArraysInstanced</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry>,
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</para>
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</refsect1>
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<refsect1 id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"></trademark> 2010 Khronos Group.
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This material may be distributed subject to the terms and conditions set forth in
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the Open Publication License, v 1.0, 8 June 1999.
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<ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
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</para>
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</refsect1>
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</refentry>
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