view_frustum.h

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#ifndef MF_VIEW_FRUSTUM_H_
#define MF_VIEW_FRUSTUM_H_

#include <utility>
#include <array>
#include "angle.h"
#include "../eigen.h"
#include "depth_projection_parameters.h"
#include "bounding_box.h"
// TODO bounding_box -> Eigen_alignedbox

namespace mf {


class view_frustum {
public: 
    enum intersection {
        outside_frustum,
        inside_frustum,
        partially_inside_frustum
    };
    
    using edge = std::pair<Eigen_vec3, Eigen_vec3>;
    using corners_array = std::array<Eigen_vec3, 8>;
    using edges_array = std::array<edge, 12>;
    using planes_array = std::array<Eigen_hyperplane3, 6>;

protected:
    view_frustum(const Eigen_mat4& mat, const depth_projection_parameters& dparam);
    view_frustum() = delete;

    Eigen_mat4& matrix_() { return view_projection_transformation_.matrix(); }
    const Eigen_mat4& matrix_() const { return view_projection_transformation_.matrix(); }

private:
    Eigen_projective3 view_projection_transformation_;
    depth_projection_parameters depth_parameters_;

public:
    const Eigen_projective3& view_projection_transformation() const { return view_projection_transformation_; } 
    const depth_projection_parameters& depth_parameters() const { return depth_parameters_; }
    
    Eigen_hyperplane3 near_plane() const;
    Eigen_hyperplane3 far_plane() const;
    Eigen_hyperplane3 left_plane() const;
    Eigen_hyperplane3 right_plane() const;
    Eigen_hyperplane3 bottom_plane() const;
    Eigen_hyperplane3 top_plane() const;
    
    planes_array planes() const;
    corners_array corners() const;
    edges_array edges() const;

    bool contains(const Eigen_vec3&, bool consider_z_planes = true) const;
    intersection contains(const bounding_box&) const;
    static intersection contains(const planes_array&, const bounding_box&);
    
    view_frustum transform(const Eigen_affine3&) const;
};

}

#endif