RayTracer/Vec3.h at master · pedroafonso18/RayTracer · GitHub

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#ifndef VEC3_H
#define VEC3_H

#include <cmath>
#include <iostream>


class vec3 {
public:
    double e[3];
    vec3();
    explicit vec3(double e0, double e1, double e2);

    [[nodiscard]] double x() const;
    [[nodiscard]] double y() const;
    [[nodiscard]] double z() const;

    vec3 operator-() const;
    double operator[](int i) const;
    double& operator[](int i);

    vec3& operator+=(const vec3& v);

    vec3& operator*=(double t);

    vec3& operator/=(double t);

    double length() const;
    double length_squared() const;

};

inline std::ostream& operator<<(std::ostream& out, const vec3& v) {
    return out << v.e[0] << ' ' << v.e[1] << ' ' << v.e[2];
}

inline vec3 operator+(const vec3& u, const vec3& v) {
    return vec3(u.e[0] + v.e[0], u.e[1] + v.e[1], u.e[2] + v.e[2]);
}

inline vec3 operator-(const vec3& u, const vec3& v) {
    return vec3(u.e[0] - v.e[0], u.e[1] - v.e[1], u.e[2] - v.e[2]);
}

inline vec3 operator*(const vec3& u, const vec3& v) {
    return vec3(u.e[0] * v.e[0], u.e[1] * v.e[1], u.e[2] * v.e[2]);
}

inline vec3 operator*(double t, const vec3& v) {
    return vec3(t*v.e[0], t*v.e[1], t*v.e[2]);
}

inline vec3 operator*(const vec3& v, double t) {
    return t * v;
}

inline vec3 operator/(const vec3& v, double t) {
    return (1/t) * v;
}

inline double dot(const vec3& u, const vec3& v) {
    return u.e[0] * v.e[0]
         + u.e[1] * v.e[1]
         + u.e[2] * v.e[2];
}

inline vec3 cross(const vec3& u, const vec3& v) {
    return vec3(u.e[1] * v.e[2] - u.e[2] * v.e[1],
                u.e[2] * v.e[0] - u.e[0] * v.e[2],
                u.e[0] * v.e[1] - u.e[1] * v.e[0]);
}

inline vec3 unit_vector(const vec3& v) {
    return v / v.length();
}


#endif