Plane.h

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#ifndef ULT_MATH_PLANE_H_INCLUDED
#define ULT_MATH_PLANE_H_INCLUDED
 
#include <Ult/Math/Vector3D.h>
 
namespace Ult
{
 
class OBB;

enum class PlaneStatus
{
    Front = 1,
    Back,
    OnPlane,
    Clipped,
    Culled,
    Visible
};

class Plane
{
public:
    Plane();
    Plane(const float a, const float b, const float c, const float d);
    
    void CreatePlaneFromTri(const Vector3D& t1, const Vector3D& t2, const Vector3D& t3);
    
    bool Intersect(const Plane& pl, Vector3D* intersectPoint) const;
    bool Intersect(const Vector3D& bbMin, const Vector3D& bbMax) const;
    bool Intersect(const Vector3D& position, const float radius) const;
    bool Intersect(const OBB& obb);
    
    PlaneStatus ClassifyPoint(const Vector3D& v) const;
    PlaneStatus ClassifyPoint(const Vector3D& v, float* dist) const;
    PlaneStatus ClassifyPoint(const float x, const float y, const float z) const;
    PlaneStatus ClassifyPoint(const float x, const float y, const float z, float* dist) const;
    
    float GetDistance(const Vector3D& v) const;
    float GetDistance(const float x, const float y, const float z) const;
    
    Vector3D Reflect(const Vector3D& vec, const float e) const;
    
    bool ClipTriangle(
        Vector3D* inVerts, const int totalInVerts,
        Vector3D* outFrontVerts, int* totalOutFrontVerts,
        Vector3D* outBackVerts, int* totalOutBackVerts
    );
    
    Vector3D GetNormal() const { return Vector3D(mA, mB, mC); }
    void SetNormal(const Vector3D& n) { mA = n.x, mB = n.y, mC = n.z; }
    
    void SetPointOnPlane(const Vector3D& p) { mPointOnPlane = p; }
    
    bool operator==(const Plane& p) {
        return
            mA == p.mA &&
            mB == p.mB &&
            mC == p.mC &&
            mD == p.mD;
    }

    Plane& operator=(const Plane& p) {
        mA = p.mA;
        mB = p.mB;
        mC = p.mC;
        mD = p.mD;
        return *this;
    }
    
    float mA, mB, mC, mD;
    Vector3D mPointOnPlane;
};
 
} // namespace Ult
 
#endif // ULT_MATH_PLANE_H_INCLUDED