#include "CgeMath.h"
#include <math.h>

#define SET_ROW(row, val) row[0] = row[1] = val

void CgeVec2fAdd(const float a[2], const float b[2], float out[2]) {
    out[0] = a[0] + b[0];
    out[1] = a[1] + b[1];
}

void CgeVec2fSub(const float a[2], const float b[2], float out[2]) {
    out[0] = a[0] - b[0];
    out[1] = a[1] - b[1];
}

void CgeVec2fMul(const float a[2], const float b[2], float out[2]) {
    out[0] = a[0] * b[0];
    out[1] = a[1] * b[1];
}

void CgeVec2fScale(const float a[2], float b, float out[2]) {
    out[0] = a[0] * b;
    out[1] = a[1] * b;
}

void CgeVec2fMulAdd(const float a[2], const float b[2], const float c[2],
                    float out[2]) {
    out[0] = a[0] * b[0] + c[0];
    out[1] = a[1] * b[1] + c[1];
}

void CgeVec2fNegate(const float in[2], float out[2]) {
    out[0] = -in[0];
    out[1] = -in[1];
}

float CgeVec2fDot(const float a[2], const float b[2]) {
    return a[0] * b[0] + a[1] * b[1];
}

float CgeVec2fCross(const float a[2], const float b[2]) {
    return a[0] * b[1] - a[1] * b[0];
}

float CgeVec2fLength(const float in[2]) {
    return sqrtf(CgeVec2fDot(in, in));
}

void CgeVec2fNormal(const float in[2], float out[2]) {
    CgeVec2fScale(in, 1.0f / CgeVec2fLength(in), out);
}

float CgeVec2fNormalEx(const float in[2], float out[2]) {
    float length;

    length = CgeVec2fLength(in);
    CgeVec2fScale(in, 1.0f / length, out);
    return length;
}

void CgeVec2fMin(const float a[2], const float b[2], float out[2]) {
    if (a[0] < b[0]) out[0] = a[0]; else out[0] = b[0];
    if (a[1] < b[1]) out[1] = a[1]; else out[1] = b[1];
}

void CgeVec2fMax(const float a[2], const float b[2], float out[2]) {
    if (a[0] > b[0]) out[0] = a[0]; else out[0] = b[0];
    if (a[1] > b[1]) out[1] = a[1]; else out[1] = b[1];
}

void CgeVec2fLerp(const float a[2], const float b[2], float t, float out[2]) {
    float tmp[2];

    CgeVec2fSub(b, a, tmp);
    CgeVec2fScale(tmp, t, tmp);
    CgeVec2fAdd(a, tmp, out);
}

void CgeVec2fProject(const float a[2], const float b[2], float out[2]) {
    float amount;

    amount = CgeVec2fDot(a, b) / CgeVec2fDot(b, b);
    CgeVec2fScale(b, amount, out);
}

void CgeVec2fBarycentric(const float a[2], const float b[2], const float c[2],
                         float v, float w, float out[2]) {
    float tmp1[2], tmp2[2];
    float u;

    u = 1.0f - v - w;
    SET_ROW(tmp1, u); CgeVec2fMul(a, tmp1, tmp2);
    SET_ROW(tmp1, v); CgeVec2fMulAdd(b, tmp1, tmp2, tmp2);
    SET_ROW(tmp1, w); CgeVec2fMulAdd(c, tmp1, tmp2, out);
}