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https://github.com/ptitSeb/Serious-Engine
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37 lines
704 B
C
37 lines
704 B
C
/*
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======================================================================
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vecmat.c
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Basic vector and matrix functions.
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====================================================================== */
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#include <math.h>
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#include "vecmat.h"
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float dot( LWFVector a, LWFVector b )
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{
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return a[ 0 ] * b[ 0 ] + a[ 1 ] * b[ 1 ] + a[ 2 ] * b[ 2 ];
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}
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void cross( LWFVector a, LWFVector b, LWFVector c )
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{
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c[ 0 ] = a[ 1 ] * b[ 2 ] - a[ 2 ] * b[ 1 ];
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c[ 1 ] = a[ 2 ] * b[ 0 ] - a[ 0 ] * b[ 2 ];
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c[ 2 ] = a[ 0 ] * b[ 1 ] - a[ 1 ] * b[ 0 ];
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}
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void normalize( LWFVector v )
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{
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float r;
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r = ( float ) sqrt( dot( v, v ));
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if ( r > 0 ) {
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v[ 0 ] /= r;
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v[ 1 ] /= r;
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v[ 2 ] /= r;
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}
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}
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