--- /dev/null
+<?xml version="1.0" encoding="UTF-8"?>\r
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"\r
+ "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">\r
+<refentry id="step">\r
+ <refmeta>\r
+ <refmetainfo>\r
+ <copyright>\r
+ <year>2011</year>\r
+ <holder>Khronos Group</holder>\r
+ </copyright>\r
+ </refmetainfo>\r
+ <refentrytitle>step</refentrytitle>\r
+ <manvolnum>3G</manvolnum>\r
+ </refmeta>\r
+ <refnamediv>\r
+ <refname>step</refname>\r
+ <refpurpose>generate a step function by comparing two values</refpurpose>\r
+ </refnamediv>\r
+ <refsynopsisdiv><title>Declaration</title>\r
+ <funcsynopsis>\r
+ <funcprototype>\r
+ <funcdef>genType <function>step</function></funcdef>\r
+ <paramdef>genType <parameter>edge</parameter></paramdef>\r
+ <paramdef>genType <parameter>x</parameter></paramdef>\r
+ </funcprototype>\r
+ </funcsynopsis>\r
+ <funcsynopsis>\r
+ <funcprototype>\r
+ <funcdef>genType <function>step</function></funcdef>\r
+ <paramdef>float <parameter>edge</parameter></paramdef>\r
+ <paramdef>genType <parameter>x</parameter></paramdef>\r
+ </funcprototype>\r
+ </funcsynopsis>\r
+ <funcsynopsis>\r
+ <funcprototype>\r
+ <funcdef>genDType <function>step</function></funcdef>\r
+ <paramdef>genDType <parameter>edge</parameter></paramdef>\r
+ <paramdef>genDType <parameter>x</parameter></paramdef>\r
+ </funcprototype>\r
+ </funcsynopsis>\r
+ <funcsynopsis>\r
+ <funcprototype>\r
+ <funcdef>genDType <function>step</function></funcdef>\r
+ <paramdef>double <parameter>edge</parameter></paramdef>\r
+ <paramdef>genDType <parameter>x</parameter></paramdef>\r
+ </funcprototype>\r
+ </funcsynopsis>\r
+ </refsynopsisdiv>\r
+ <refsect1 id="parameters"><title>Parameters</title>\r
+ <variablelist>\r
+ <varlistentry>\r
+ <term><parameter>edge</parameter></term>\r
+ <listitem>\r
+ <para>\r
+ Specifies the location of the edge of the step function.\r
+ </para>\r
+ </listitem>\r
+ </varlistentry>\r
+ <varlistentry>\r
+ <term><parameter>x</parameter></term>\r
+ <listitem>\r
+ <para>\r
+ Specify the value to be used to generate the step function.\r
+ </para>\r
+ </listitem>\r
+ </varlistentry>\r
+ </variablelist>\r
+ </refsect1>\r
+ <refsect1 id="description"><title>Description</title>\r
+ <para>\r
+ <function>step</function> generates a step function by comparing <parameter>x</parameter> to <parameter>edge</parameter>.\r
+ </para>\r
+ <para>\r
+ For element <emphasis>i</emphasis> of the return value, 0.0 is returned if <parameter>x</parameter>[<emphasis>i</emphasis>]\r
+ < <parameter>edge</parameter>[<emphasis>i</emphasis>], and 1.0 is returned otherwise.\r
+ </para>\r
+ </refsect1>\r
+ <refsect1 id="versions"><title>Version Support</title>\r
+ <informaltable frame="topbot">\r
+ #VARTABLECOLS#\r
+ <thead>\r
+ #FUNCTABLEHEADER#\r
+ <row>\r
+ <entry>step (genType)</entry>#newin11#\r
+ </row>\r
+ <row>\r
+ <entry>step (genDType)</entry>#newin40#\r
+ </row>\r
+ </thead>\r
+ </tgroup>\r
+ </informaltable>\r
+ </refsect1>\r
+ <refsect1 id="seealso"><title>See Also</title>\r
+ <para>\r
+ <citerefentry><refentrytitle>mix</refentrytitle></citerefentry>,\r
+ <citerefentry><refentrytitle>smoothstep</refentrytitle></citerefentry>\r
+ </para>\r
+ </refsect1>\r
+ <refsect1 id="Copyright"><title>Copyright</title>\r
+ <para>\r
+ Copyright <trademark class="copyright"></trademark> 2011 Khronos Group. \r
+ This material may be distributed subject to the terms and conditions set forth in \r
+ the Open Publication License, v 1.0, 8 June 1999.\r
+ <ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.\r
+ </para>\r
+ </refsect1>\r
+</refentry>\r