projection_view_frustum.h

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#ifndef MF_PROJECTION_VIEW_FRUSTUM_H_
#define MF_PROJECTION_VIEW_FRUSTUM_H_

#include "view_frustum.h"
#include "angle.h"
#include "../eigen.h"
#include <utility>
#include <array>

namespace mf {



class projection_view_frustum : public view_frustum {
private:
    projection_view_frustum(const Eigen_mat4& mat, const depth_projection_parameters& conv) :
        view_frustum(mat, conv) { }

    static std::array<real, 3> depth_components_(const depth_projection_parameters&);

public:
    using distance_pair = std::pair<real, real>;
    using angle_pair = std::pair<angle, angle>;
    
    static projection_view_frustum symmetric_perspective
        (real near_width, real near_height, const depth_projection_parameters&);
        
    static projection_view_frustum symmetric_perspective_fov
        (angle near_width, angle near_height, const depth_projection_parameters&);
    
    static projection_view_frustum symmetric_perspective_fov_x
        (angle near_width, real aspect_ratio, const depth_projection_parameters&);

    static projection_view_frustum symmetric_perspective_fov_y
        (angle near_height, real aspect_ratio, const depth_projection_parameters&);
    
    static projection_view_frustum asymmetric_perspective
        (distance_pair near_x, distance_pair near_y, const depth_projection_parameters&);

    static projection_view_frustum asymmetric_perspective_fov
        (angle_pair near_x, angle_pair near_y, const depth_projection_parameters&); 
    
    const Eigen_projective3& projection_transformation() const {
        return view_frustum::view_projection_transformation();
    }
    
    real aspect_ratio() const;
    bool is_symmetric_x() const;
    bool is_symmetric_y() const;
    bool is_symmetric() const;
    
    void adjust_fov_x_to_aspect_ratio(real aspect_ratio);
    void adjust_fov_y_to_aspect_ratio(real aspect_ratio);
};
// TODO add orthogonal projection if needed

}

#endif