hittable_list.h

//
//  hittable_list.h
//  raytracer
//
//  Created by Gabriel de Jesus on 27/03/21.
//

#ifndef hittable_list_h
#define hittable_list_h

#include "hittable.h"

#include <memory>
#include <vector>

using std::shared_ptr;
using std::make_shared;

class hittable_list : public hittable {
public:
    hittable_list() {}
    hittable_list(shared_ptr<hittable> object) { add(object); }
    
    void clear() { objects.clear(); }
    void add(shared_ptr<hittable> object) { objects.push_back(object); }
    
    virtual bool hit(const ray& r, double t_min, double t_max, hit_record& rec) const override;
    
public:
    std::vector<shared_ptr<hittable>> objects;
};

bool hittable_list::hit(const ray& r, double t_min, double t_max, hit_record& rec) const {
    hit_record temp_rec;
    bool hit_anything = false;
    auto closest_so_far = t_max;
    
    for (const auto& object : objects) {
        if (object->hit(r, t_min, closest_so_far, temp_rec)) {
            hit_anything = true;
            closest_so_far = temp_rec.t;
            rec = temp_rec;
        }
    }
    
    return hit_anything;
}

#endif /* hittable_list_h */