// Wild Magic Source Code
// David Eberly
// http://www.geometrictools.com
// Copyright (c) 1998-2008
//
// This library is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 2.1 of the License, or (at
// your option) any later version.  The license is available for reading at
// either of the locations:
//     http://www.gnu.org/copyleft/lgpl.html
//     http://www.geometrictools.com/License/WildMagicLicense.pdf
//
// Version: 4.0.1 (2007/05/06)

#ifndef WM4INTRBOX3SPHERE3_H
#define WM4INTRBOX3SPHERE3_H

#include "Wm4FoundationLIB.h"
#include "Wm4Intersector.h"
#include "Wm4Box3.h"
#include "Wm4Sphere3.h"

namespace Wm4
{

template <class Real>
class WM4_FOUNDATION_ITEM IntrBox3Sphere3
    : public Intersector<Real,Vector3<Real> >
{
public:
    IntrBox3Sphere3 (const Box3<Real>& rkBox,
        const Sphere3<Real>& rkSphere);

    // object access
    const Box3<Real>& GetBox () const;
    const Sphere3<Real>& GetSphere () const;

    // test-intersection query
    virtual bool Test ();

    // find-intersection query
    virtual bool Find (Real fTMax, const Vector3<Real>& rkVelocity0,
        const Vector3<Real>& rkVelocity1);

    // intersection set for dynamic find-intersection query
    const Vector3<Real>& GetContactPoint () const;

private:
    using Intersector<Real,Vector3<Real> >::IT_EMPTY;
    using Intersector<Real,Vector3<Real> >::IT_POINT;
    using Intersector<Real,Vector3<Real> >::IT_OTHER;
    using Intersector<Real,Vector3<Real> >::m_iIntersectionType;
    using Intersector<Real,Vector3<Real> >::m_fContactTime;

    // supporting functions for dynamic Find function
    static Real GetVertexIntersection (Real fDx, Real fDy, Real fDz,
        Real fVx, Real fVy, Real fVz, Real fRSqr);

    static Real GetEdgeIntersection (Real fDx, Real fDz, Real fVx, Real fVz,
        Real fVSqr, Real fRSqr);

    int FindFaceRegionIntersection (Real fEx, Real fEy, Real fEz,
        Real fCx, Real fCy, Real fCz, Real fVx, Real fVy, Real fVz,
        Real& rfIx, Real& rfIy, Real& rfIz, bool bAboveFace);

    int FindJustEdgeIntersection (Real fCy, Real fEx, Real fEy,
        Real fEz, Real fDx, Real fDz, Real fVx, Real fVy, Real fVz,
        Real& rfIx, Real& rfIy, Real& rfIz);

    int FindEdgeRegionIntersection (Real fEx, Real fEy, Real fEz,
        Real fCx, Real fCy, Real fCz, Real fVx, Real fVy, Real fVz,
        Real& rfIx, Real& rfIy, Real& rfIz, bool bAboveEdge);

    int FindVertexRegionIntersection (Real fEx, Real fEy, Real fEz,
        Real fCx, Real fCy, Real fCz, Real fVx, Real fVy, Real fVz,
        Real& rfIx, Real& rfIy, Real& rfIz);

    // the objects to intersect
    const Box3<Real>* m_pkBox;
    const Sphere3<Real>* m_pkSphere;

    // point of intersection
    Vector3<Real> m_kContactPoint;
};

typedef IntrBox3Sphere3<float> IntrBox3Sphere3f;
typedef IntrBox3Sphere3<double> IntrBox3Sphere3d;

}

#endif
