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81 lines
3.9 KiB
XML
81 lines
3.9 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="glPrimitiveRestartIndex">
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<refentryinfo>
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<copyright>
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<year>2010-2013</year>
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<holder>Khronos Group</holder>
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</copyright>
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</refentryinfo>
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<refmeta>
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<refentrytitle>glPrimitiveRestartIndex</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glPrimitiveRestartIndex</refname>
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<refpurpose>specify the primitive restart index</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>glPrimitiveRestartIndex</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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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>index</parameter></term>
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<listitem>
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<para>
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Specifies the value to be interpreted as the primitive restart index.
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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>glPrimitiveRestartIndex</function> specifies a vertex array element that is treated specially when
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primitive restarting is enabled. This is known as the primitive restart index.
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</para>
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<para>
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When one of the <function>Draw*</function> commands transfers a set of generic attribute array elements to
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the GL, if the index within the vertex arrays corresponding to that set is equal to the primitive restart
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index, then the GL does not process those elements as a vertex. Instead, it is as if the drawing command
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ended with the immediately preceding transfer, and another drawing command is immediately started with
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the same parameters, but only transferring the immediately following element through the end of the
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originally specified elements.
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</para>
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<para>
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When either <citerefentry><refentrytitle>glDrawElementsBaseVertex</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawElementsInstancedBaseVertex</refentrytitle></citerefentry> or
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<citerefentry><refentrytitle>glMultiDrawElementsBaseVertex</refentrytitle></citerefentry> is used, the primitive restart
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comparison occurs before the basevertex offset is added to the array index.
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</para>
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</refsect1>
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<refsect1 id="notes"><title>Notes</title>
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<para>
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<function>glPrimitiveRestartIndex</function> is available only if the GL version is 3.1 or greater.
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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>glDrawElements</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawElementsBaseVertex</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawElementsInstancedBaseVertex</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> 2010-2013 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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