v4math.cpp

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#include "linden_common.h"

//#include "vmath.h"
#include "v3math.h"
#include "v4math.h"
#include "m4math.h"
#include "m3math.h"
#include "llquaternion.h"

// LLVector4

// Axis-Angle rotations

/*
const LLVector4&        LLVector4::rotVec(F32 angle, const LLVector4 &vec)
{
        if ( !vec.isExactlyZero() && angle )
        {
                *this = *this * LLMatrix4(angle, vec);
        }
        return *this;
}

const LLVector4&        LLVector4::rotVec(F32 angle, F32 x, F32 y, F32 z)
{
        LLVector3 vec(x, y, z);
        if ( !vec.isExactlyZero() && angle )
        {
                *this = *this * LLMatrix4(angle, vec);
        }
        return *this;
}
*/

const LLVector4&        LLVector4::rotVec(const LLMatrix4 &mat)
{
        *this = *this * mat;
        return *this;
}

const LLVector4&        LLVector4::rotVec(const LLQuaternion &q)
{
        *this = *this * q;
        return *this;
}

const LLVector4&        LLVector4::scaleVec(const LLVector4& vec)
{
        mV[VX] *= vec.mV[VX];
        mV[VY] *= vec.mV[VY];
        mV[VZ] *= vec.mV[VZ];
        mV[VW] *= vec.mV[VW];

        return *this;
}

// Sets all values to absolute value of their original values
// Returns TRUE if data changed
BOOL LLVector4::abs()
{
        BOOL ret = FALSE;

        if (mV[0] < 0.f) { mV[0] = -mV[0]; ret = TRUE; }
        if (mV[1] < 0.f) { mV[1] = -mV[1]; ret = TRUE; }
        if (mV[2] < 0.f) { mV[2] = -mV[2]; ret = TRUE; }
        if (mV[3] < 0.f) { mV[3] = -mV[3]; ret = TRUE; }

        return ret;
}


std::ostream& operator<<(std::ostream& s, const LLVector4 &a) 
{
        s << "{ " << a.mV[VX] << ", " << a.mV[VY] << ", " << a.mV[VZ] << ", " << a.mV[VW] << " }";
        return s;
}


// Non-member functions

F32 angle_between( const LLVector4& a, const LLVector4& b )
{
        LLVector4 an = a;
        LLVector4 bn = b;
        an.normVec();
        bn.normVec();
        F32 cosine = an * bn;
        F32 angle = (cosine >= 1.0f) ? 0.0f :
                (cosine <= -1.0f) ? F_PI :
                acos(cosine);
        return angle;
}

BOOL are_parallel(const LLVector4 &a, const LLVector4 &b, F32 epsilon)
{
        LLVector4 an = a;
        LLVector4 bn = b;
        an.normVec();
        bn.normVec();
        F32 dot = an * bn;
        if ( (1.0f - fabs(dot)) < epsilon)
                return TRUE;
        return FALSE;
}


LLVector3 vec4to3(const LLVector4 &vec)
{
        return LLVector3( vec.mV[VX], vec.mV[VY], vec.mV[VZ] );
}

LLVector4 vec3to4(const LLVector3 &vec)
{
        return LLVector4(vec.mV[VX], vec.mV[VY], vec.mV[VZ]);
}

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