<HTML> <HEAD> <TITLE>trunc</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 trunc(float1 x); float2 trunc(float2 x); float3 trunc(float3 x); float4 trunc(float4 x); half trunc(half x); half1 trunc(half1 x); half2 trunc(half2 x); half3 trunc(half3 x); half4 trunc(half4 x); fixed trunc(fixed x); fixed1 trunc(fixed1 x); fixed2 trunc(fixed2 x); fixed3 trunc(fixed3 x); fixed4 trunc(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 which to truncate. </P> </DD></DL> <H1><A NAME="DESCRIPTION"><A NAME="4">DESCRIPTION </A></A></H1> <P> Returns the integral value nearest to but no larger in magnitude than x. </P> <H1><A NAME="REFERENCE_IMPLEMENTATION"><A NAME="5">REFERENCE IMPLEMENTATION </A></A></H1> <P> <B>trunc</B> for a <B>float3</B> vector could be implemented like this. </P> <PRE> float3 trunc(float3 v) { float3 rv; int i; for (i=0; i<3; i++) { float x = v[i]; rv[i] = x < 0 ? -floor(-x) : floor(x); } return rv; } </PRE> <H1><A NAME="PROFILE_SUPPORT"><A NAME="6">PROFILE SUPPORT </A></A></H1> <P> <B>trunc</B> is supported in all profiles except <A HREF="fp20.html">fp20</A>. </P> <H1><A NAME="SEE_ALSO"><A NAME="7">SEE ALSO </A></A></H1> <P> <A HREF="ceil.html"><I>ceil</I></A>, <A HREF="floor.html"><I>floor</I></A>, <A HREF="round.html"><I>round</I></A> </P> </BLOCKQUOTE> </BODY>