2013-10-10 23:58:54 +00:00
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<?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="glVertexAttribDivisor">
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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>glVertexAttribDivisor</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glVertexAttribDivisor</refname>
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<refpurpose>modify the rate at which generic vertex attributes advance during instanced rendering</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>glVertexAttribDivisor</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLuint <parameter>divisor</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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Specify the index of the generic vertex attribute.
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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>divisor</parameter></term>
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<listitem>
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<para>
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Specify the number of instances that will pass between updates of the generic attribute at slot <parameter>index</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>glVertexAttribDivisor</function> modifies the rate at which generic vertex attributes advance when rendering
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multiple instances of primitives in a single draw call. If <parameter>divisor</parameter> is zero, the attribute at slot
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<parameter>index</parameter> advances once per vertex. If <parameter>divisor</parameter> is non-zero, the attribute advances
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once per <parameter>divisor</parameter> instances of the set(s) of vertices being rendered. An attribute
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is referred to as instanced if its <constant>GL_VERTEX_ATTRIB_ARRAY_DIVISOR</constant> value is non-zero.
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</para>
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<para>
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<parameter>index</parameter> must be less than the value of <constant>GL_MAX_VERTEX_ATTRIBUTES</constant>.
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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>glVertexAttribDivisor</function> is available only if the GL version is 3.3 or higher.
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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_VALUE</constant> is generated if <parameter>index</parameter> is greater
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than or equal to the value of <constant>GL_MAX_VERTEX_ATTRIBUTES</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>glVertexAttribPointer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glEnableVertexAttribArray</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDisableVertexAttribArray</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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