Frustum.h

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#ifndef FRUSTUM_H
#define FRUSTUM_H

#include "ngl/Matrix.h"

// Modified from :-
// Mathieu Sanchez (2010)
class Frustum
{
private:

    struct Plane
    {
        float a,b,c,d;
    };

    enum planeSides{
        e_left = 0,
        e_right = 1,
        e_bottom = 2,
        e_top = 3,
        e_near = 4,
        e_far = 5
    };

    enum planeSign{
        e_minus = -1,
        e_plus = 1
    };

    Plane m_planes[6];

    void buildPlane(Plane &io_plane, const ngl::Matrix &_mat, int _row, int _sign);

    void normalizePlane(Plane &_plane);

public:
    Frustum(){}

    void generate(const ngl::Matrix &_mat);

    bool isAbovePlane(unsigned int _planeSide, const ngl::Vector &_point)const;

    bool isInFrustum(const ngl::Vector &_min,const ngl::Vector &_max)const;

    bool isInFrustum(const ngl::Vector &_point)const;

};

#endif // FRUSTUM_H