--- /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="smoothstep">\r
+ <refmeta>\r
+ <refmetainfo>\r
+ <copyright>\r
+ <year>2011</year>\r
+ <holder>Khronos Group</holder>\r
+ </copyright>\r
+ </refmetainfo>\r
+ <refentrytitle>smoothstep</refentrytitle>\r
+ <manvolnum>3G</manvolnum>\r
+ </refmeta>\r
+ <refnamediv>\r
+ <refname>smoothstep</refname>\r
+ <refpurpose>perform Hermite interpolation between two values</refpurpose>\r
+ </refnamediv>\r
+ <refsynopsisdiv><title>Declaration</title>\r
+ <funcsynopsis>\r
+ <funcprototype>\r
+ <funcdef>genType <function>smoothstep</function></funcdef>\r
+ <paramdef>genType <parameter>edge0</parameter></paramdef>\r
+ <paramdef>genType <parameter>edge1</parameter></paramdef>\r
+ <paramdef>genType <parameter>x</parameter></paramdef>\r
+ </funcprototype>\r
+ </funcsynopsis>\r
+ <funcsynopsis>\r
+ <funcprototype>\r
+ <funcdef>genType <function>smoothstep</function></funcdef>\r
+ <paramdef>float <parameter>edge0</parameter></paramdef>\r
+ <paramdef>float <parameter>edge1</parameter></paramdef>\r
+ <paramdef>genType <parameter>x</parameter></paramdef>\r
+ </funcprototype>\r
+ </funcsynopsis>\r
+ <funcsynopsis>\r
+ <funcprototype>\r
+ <funcdef>genDType <function>smoothstep</function></funcdef>\r
+ <paramdef>genDType <parameter>edge0</parameter></paramdef>\r
+ <paramdef>genDType <parameter>edge1</parameter></paramdef>\r
+ <paramdef>genDType <parameter>x</parameter></paramdef>\r
+ </funcprototype>\r
+ </funcsynopsis>\r
+ <funcsynopsis>\r
+ <funcprototype>\r
+ <funcdef>genDType <function>smoothstep</function></funcdef>\r
+ <paramdef>double <parameter>edge0</parameter></paramdef>\r
+ <paramdef>double <parameter>edge1</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>edge0</parameter></term>\r
+ <listitem>\r
+ <para>\r
+ Specifies the value of the lower edge of the Hermite function.\r
+ </para>\r
+ </listitem>\r
+ </varlistentry>\r
+ <varlistentry>\r
+ <term><parameter>edge1</parameter></term>\r
+ <listitem>\r
+ <para>\r
+ Specifies the value of the upper edge of the Hermite function.\r
+ </para>\r
+ </listitem>\r
+ </varlistentry>\r
+ <varlistentry>\r
+ <term><parameter>x</parameter></term>\r
+ <listitem>\r
+ <para>\r
+ Specifies the source value for interpolation.\r
+ </para>\r
+ </listitem>\r
+ </varlistentry>\r
+ </variablelist>\r
+ </refsect1>\r
+ <refsect1 id="description"><title>Description</title>\r
+ <para>\r
+ <function>smoothstep</function> performs smooth Hermite interpolation between 0 and\r
+ 1 when <parameter>edge0</parameter> < <parameter>x</parameter> < <parameter>edge1</parameter>.\r
+ This is useful in cases where a threshold function with a smooth transition is desired.\r
+ <function>smoothstep</function> is equivalent to:\r
+ </para>\r
+ <para>\r
+<programlisting><![CDATA[ genType t; /* Or genDType t; */\r
+ t = clamp((x - edge0) / (edge1 - edge0), 0.0, 1.0);\r
+ return t * t * (3.0 - 2.0 * t);\r
+]]></programlisting>\r
+ </para>\r
+ <para>\r
+ Results are undefined if <parameter>edge0</parameter> ≥ <parameter>edge1</parameter>.\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>smoothstep (genType)</entry>#newin13#\r
+ </row>\r
+ <row>\r
+ <entry>smoothstep (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>step</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