<HTML> <HEAD> <TITLE>dot</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 dot(float1 a, float1 b); float2 dot(float2 a, float2 b); float3 dot(float3 a, float3 b); float4 dot(float4 a, float4 b); half dot(half a, half b); half1 dot(half1 a, half1 b); half2 dot(half2 a, half2 b); half3 dot(half3 a, half3 b); half4 dot(half4 a, half4 b); fixed dot(fixed a, fixed b); fixed1 dot(fixed1 a, fixed1 b); fixed2 dot(fixed2 a, fixed2 b); fixed3 dot(fixed3 a, fixed3 b); fixed4 dot(fixed4 a, fixed4 b); </PRE> <H1><A NAME="PARAMETERS"><A NAME="3">PARAMETERS </A></A></H1> <DL> <DT><STRONG>a </STRONG></DT> <DD> <P> First vector. </P> <DT><STRONG>b </STRONG></DT> <DD> <P> Second vector. </P> </DD></DL> <H1><A NAME="DESCRIPTION"><A NAME="4">DESCRIPTION </A></A></H1> <P> Returns the scalar dot product of two same-typed vectors <I>a</I> and <I>b</I>. </P> <H1><A NAME="REFERENCE_IMPLEMENTATION"><A NAME="5">REFERENCE IMPLEMENTATION </A></A></H1> <P> <B>dot</B> for <B>float4</B> vectors could be implemented this way: </P> <PRE> float dot(float4 a, float4 b) { return a.x*b.x + a.y*b.y + a.z*b.z + a.w*b.w; } </PRE> <H1><A NAME="PROFILE_SUPPORT"><A NAME="6">PROFILE SUPPORT </A></A></H1> <P> <B>dot</B> is supported in all profiles. </P> <P> The <B>fixed3</B> dot product is very efficient in the <A HREF="fp20.html">fp20</A> and <A HREF="fp30.html">fp30</A> profiles. </P> <P> The <B>float3</B> and <B>float4</B> dot products are very efficient in the <A HREF="vp20.html">vp20</A>, <A HREF="vp30.html">vp30</A>, <A HREF="vp40.html">vp40</A>, <A HREF="arbvp1.html">arbvp1</A>, <A HREF="fp30.html">fp30</A>, <A HREF="fp40.html">fp40</A>, and <A HREF="arbfp1.html">arbfp1</A> profiles. </P> <P> The <B>float2</B> dot product is very efficient in the <A HREF="fp40.html">fp40</A> profile. In optimal circumstances, two two-component dot products can sometimes be performed at the four-component and three-component dot product rate. </P> <H1><A NAME="SEE_ALSO"><A NAME="7">SEE ALSO </A></A></H1> <P> <A HREF="cross.html"><I>cross</I></A>, <A HREF="lit.html"><I>lit</I></A>, <A HREF="mul.html"><I>mul</I></A> </P> </BLOCKQUOTE> </BODY>