<HTML> <HEAD> <TITLE>sign</TITLE> <STYLE TYPE="text/css" MEDIA=screen> <!-- BODY { font-family: Arial,Helvetica; } BLOCKQUOTE { margin: 10pt; } H1,A { color: #336699; } /*** Top menu style ****/ .mmenuon { font-family: Arial,Helvetica; font-weight: bold; text-decoration: none; color: #ff6600; font-size: 10pt; } .mmenuoff { font-family: Arial,Helvetica; font-weight: bold; text-decoration: none; color: #ffffff; font-size: 10pt; } .cpyright { font-family: Arial,Helvetica; font-weight: bold; text-decoration: none; color: #ffffff; font-size: xx-small; } .cpyrightText { font-family: Arial,Helvetica; font-weight: bold; text-decoration: none; color: #ffffff; font-size: xx-small; } .sections { font-family: Arial,Helvetica; font-weight: bold; text-decoration: none; color: #336699; font-size: 11pt; } .dsections { font-family: Arial,Helvetica; font-weight: bold; text-decoration: none; color: #336699; font-size: 12pt; } .slink { font-family: Arial,Helvetica; font-weight: normal; text-decoration: none; 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float1 sign(float1 x); float2 sign(float2 x); float3 sign(float3 x); float4 sign(float4 x); half sign(half x); half1 sign(half1 x); half2 sign(half2 x); half3 sign(half3 x); half4 sign(half4 x); fixed sign(fixed x); fixed1 sign(fixed1 x); fixed2 sign(fixed2 x); fixed3 sign(fixed3 x); fixed4 sign(fixed4 x); </PRE> <H1><A NAME="PARAMETERS"><A NAME="3">PARAMETERS </A></A></H1> <DL> <DT><STRONG>x </STRONG></DT> <DD> <P> Vector or scalar to determine its sign. </P> </DD></DL> <H1><A NAME="DESCRIPTION"><A NAME="4">DESCRIPTION </A></A></H1> <P> Returns positive one, zero, or negative one for each of the components of <I>x</I> based on the component's sign. </P> <DL> <DT><STRONG></STRONG></DT> <DD> <P> 1) Returns -1 component if the respective component of <I>x</I> is negative. </P> <DT><STRONG></STRONG></DT> <DD> <P> 2) Returns 0 component if the respective component of <I>x</I> is zero. </P> <DT><STRONG></STRONG></DT> <DD> <P> 3) Returns 1 component if the respective component of <I>x</I> is positive. </P> <DT><STRONG></STRONG></DT> <DD> <P> 4) Ideally, NaN returns NaN. </P> </DD></DL> <H1><A NAME="REFERENCE_IMPLEMENTATION"><A NAME="5">REFERENCE IMPLEMENTATION </A></A></H1> <P> <B>sign</B> for <B>float3</B> could be implemented like this. </P> <PRE> float3 sign(float x) { float3 val = a > 0; return val - (a < 0); } </PRE> <H1><A NAME="PROFILE_SUPPORT"><A NAME="6">PROFILE SUPPORT </A></A></H1> <P> <B>sign</B> is supported in all profiles except <A HREF="fp20.html">fp20</A>. </P> <P> <B>sign</B> is very efficient in the <A HREF="gp4vp.html">gp4vp</A>, <A HREF="gp4gp.html">gp4gp</A>, <A HREF="gp4fp.html">gp4fp</A>, <A HREF="vp40.html">vp40</A>, and <A HREF="vp30.html">vp30</A> profiles that support the native SSG instruction. </P> <H1><A NAME="SEE_ALSO"><A NAME="7">SEE ALSO </A></A></H1> <P> <A HREF="max.html"><I>max</I></A>, <A HREF="min.html"><I>min</I></A>, <A HREF="saturate.html"><I>saturate</I></A>, <A HREF="step.html"><I>step</I></A> </P> </BLOCKQUOTE> </BODY>