#ifndef POLYGON_H
#define POLYGON_H

#include "fastmath.hpp"

struct polygon {

    const vec3 points[3];

    polygon(const vec3 &v1, const vec3 &v2, const vec3 &v3)
        : points{v1, v2, v3} {}

    bool contains(const vec3 &p) {
        for (int i = 0; i < 3; i++) {
            int n = (i + 1) % 3;

            vec3 d = points[n] - points[i];
            d = vec3(d.y, -d.x, d.z);

            vec3 s = p - points[n];

            if (s * d < decimal(0.0))
                return false;
        }
        return true;
    }
};

#endif