/home/travis/build/lis-epfl/MAVRIC_Library/util/raytracing.hpp

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/*******************************************************************************
 * \file raytracing.hpp
 *
 * \author MAV'RIC Team
 * \author Julien Lecoeur
 *
 * \brief Raytracing. Implements rays and intersection with objects (plane, sphere, cylinder... )
 *
 ******************************************************************************/


#ifndef RAYTRACING_HPP_
#define RAYTRACING_HPP_

#include "util/matrix.hpp"
#include <vector>

namespace raytracing
{


//##################################################################################################
// Ray class
//##################################################################################################
class Ray
{
public:
    Ray(Vector3f origin = Vector3f{0.0f, 0.0f, 0.0f}, Vector3f direction = Vector3f{1.0f, 0.0f, 0.0f});

    const Vector3f& origin(void) const;

    bool set_origin(Vector3f origin);

    const Vector3f& direction(void) const;

    bool set_direction(Vector3f origin);

private:
    Vector3f origin_;           
    Vector3f direction_;        
};


//##################################################################################################
// Intersection class
//##################################################################################################
class Intersection
{
public:
    Intersection(Vector3f point = Vector3f{0.0f, 0.0f, 0.0f}, Vector3f normal = Vector3f{1.0f, 0.0f, 0.0f}, float distance = 0.0f);

    const Vector3f& point(void) const;

    bool set_point(Vector3f point);

    const Vector3f& normal(void) const;

    bool set_normal(Vector3f normal);

    float distance(void) const;

    bool set_distance(float distance);

private:
      Vector3f point_;     
      Vector3f normal_;    
      float distance_;     
};


//##################################################################################################
// Object interface
//##################################################################################################
class Object
{
public:
    virtual bool intersect(const Ray& ray, Intersection& intersection) = 0;
};

//##################################################################################################
// World class
//##################################################################################################
class World
{
public:
    World(void);

    bool add_object(Object* obj);

    bool intersect(const Ray& ray, Intersection& intersection, Object* object);

private:
    std::array<Object*, 20>  objects_;
    uint32_t                 object_count_;
};


//##################################################################################################
// Plane class
//##################################################################################################
class Plane: public Object
{
public:
    Plane(Vector3f center = Vector3f{0.0f, 0.0f, 0.0f}, Vector3f normal = Vector3f{1.0f, 0.0f, 0.0f});

    const Vector3f& center(void) const;

    bool set_center(Vector3f center);

    const Vector3f& normal(void) const;

    bool set_normal(Vector3f normal);

    bool intersect(const Ray& ray, Intersection& intersection);

private:
    Vector3f center_;       
    Vector3f normal_;       
};


//##################################################################################################
// Sphere class
//##################################################################################################
class Sphere: public Object
{
public:
    Sphere(Vector3f center = Vector3f{0.0f, 0.0f, 0.0f}, float radius = 1.0f);

    const Vector3f& center(void) const;

    bool set_center(Vector3f center);

    float radius(void) const;

    bool set_radius(float radius);

    bool intersect(const Ray& ray, Intersection& intersection);

private:
    Vector3f center_;       
    float radius_;          
};


//##################################################################################################
// Cylinder class
//##################################################################################################
class Cylinder: public Object
{
public:
    Cylinder(Vector3f center = Vector3f{0.0f, 0.0f, 0.0f}, Vector3f axis = Vector3f{0.0f, 0.0f, 1.0f}, float radius = 1.0f);

    const Vector3f& center(void) const;

    bool set_center(Vector3f center);

    const Vector3f& axis(void) const;

    bool set_axis(Vector3f axis);

    float radius(void) const;

    bool set_radius(float radius);

    bool intersect(const Ray& ray, Intersection& intersection);

private:
    Vector3f center_;       
    Vector3f axis_;         
    float radius_;          
    // float height_;          ///< Height of cylinder
};

}

#endif /* RAYTRACING_HPP_ */