#ifndef _COLLISIONUTIL
#define _COLLISIONUTIL

class CAABox;
class CMaterialList;
class CCollisionInfoList;
class CVector3f;
class CSphere;
class CMRay;
class CPlane;

namespace CollisionUtil {

void AddAverageToFront(const CCollisionInfoList& in, CCollisionInfoList& out);
void FilterOutBackfaces(const CVector3f& relVel, const CCollisionInfoList& in,
                        CCollisionInfoList& out);
void FilterByClosestNormal(const CVector3f& norm, const CCollisionInfoList& in,
                           CCollisionInfoList& out);
bool TriBoxOverlap(const CVector3f& boxcenter, const CVector3f& boxhalfsize,
                   const CVector3f& trivert0, const CVector3f& trivert1, const CVector3f& trivert2);
bool BoxLineTest(const CAABox&, const CVector3f&, const CVector3f&, float&, float&, int&, bool&);
bool LineCircleIntersection2d(const CVector3f&, const CVector3f&, const CSphere&, int, int, float&);
bool TriSphereOverlap(const CSphere&, const CVector3f&, const CVector3f&, const CVector3f&);
bool TriSphereIntersection(const CSphere&, const CVector3f&, const CVector3f&, const CVector3f&,
                           CVector3f&, CVector3f&);
double TriPointSqrDist(const CVector3f&, const CVector3f&, const CVector3f&, const CVector3f&,
                       float*, float*);

bool AABoxAABoxIntersection(const CAABox& left, const CAABox& right);
bool AABoxAABoxIntersection(const CAABox& left, const CMaterialList& leftFilter,
                            const CAABox& right, const CMaterialList& rightFilter,
                            CCollisionInfoList& list);
bool AABoxSphereIntersection(const CAABox&, const CSphere&);
float AABoxSphereIntersectionRadius(const CAABox&, const CSphere&);
bool RayTriangleIntersection(const CVector3f&, const CVector3f&, const CVector3f*, float&);
bool RayTriangleIntersection_Double(const CVector3f&, const CVector3f&, const CVector3f*, double&);
int RayAABoxIntersection(const CMRay& ray, const CAABox& box, float& tMin, float& tMax);
int RayAABoxIntersection_Double(const CMRay& ray, const CAABox& box, CVector3f& dir,
                                double& penetration);
int RayAABoxIntersection(const CMRay& ray, const CAABox& box, CVector3f& dir, float& penetration);
bool AABox_AABox_Moving(const CAABox& left, const CAABox& right, const CVector3f& dir, double& d,
                        CVector3f& point, CVector3f& normal);
float AABoxSphereIntersectionRadius(const CAABox&, const CSphere&);

bool MovingSphereAABox(const CSphere& sphere, const CAABox& aabb, const CVector3f& dir,
                       double& dOut, CVector3f& point, CVector3f& normal);
bool RaySphereIntersection_Double(const CSphere& sphere, const CVector3f& pos, const CVector3f& dir,
                                  double& T);
bool RaySphereIntersection(const CSphere& sphere, const CVector3f& pos, const CVector3f& dir,
                           float mag, float& T, CVector3f& point);
bool RayPlaneIntersection(const CVector3f& from, const CVector3f& to, const CPlane& plane,
                          CVector3f& point);

// Global function defined in either CBallFilter or an unknown TU, name unknown.
// Called by CNewFlameThrower.
void AccumulateCollisionInfo(const CCollisionInfoList& in, CCollisionInfoList& out);

} // namespace CollisionUtil

#endif // _COLLISIONUTIL