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<BLOCKQUOTE>
<H1><A NAME="NAME"><A NAME="1">NAME
</A></A></H1>
<P>
<B>sign</B> - returns sign of scalar or each vector component.
</P>
<H1><A NAME="SYNOPSIS"><A NAME="2">SYNOPSIS
</A></A></H1>
<PRE> float sign(float x);
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>
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