source: trunk/VUT/GtpVisibilityPreprocessor/src/VssRay.h @ 426

#ifndef __VSS_RAY_H
#define __VSS_RAY_H

#include <vector>
using namespace std;
#include "Vector3.h"
#include "Ray.h"

class AxisAlignedBox3;
class Intersectable;

class VssRay {
public:
        // various flags
  enum {
    FPosDirX = 1,  // the direction of ray in X-axis is positive
    FPosDirY = 2,  // the direction of ray in Y-axis is positive
    FPosDirZ = 4   // the direction of ray in Z-axis is positive
  };

        static int mailID;
  int mMailbox;
        
        // side of the ray - used for the ray classification
        //  char mSide;
        
        // computed t
  float mT;

        // inverse of the ray size
        float mInvSize;
        
        // counter of references to this ray
  short mRefCount;

        // various flags
  char mFlags;
        
  Vector3 mOrigin;
  Vector3 mTermination;
        
        /// Termination object for the ray
        /// only the termination object is actually used
        Intersectable *mOriginObject;
        Intersectable *mTerminationObject;
        
        //////////////////////////////
        VssRay(const Vector3 &origin,
                                 const Vector3 &termination,
                                 Intersectable *originObject,
                                 Intersectable *terminationObject):
                mMailbox(-1),
    mOrigin(origin),
    mTermination(termination),
                mOriginObject(originObject),
                mTerminationObject(terminationObject),
                mRefCount(0),
    mFlags(0)
        {
    Precompute();
  }
        
        VssRay(const Ray &ray):
                mRefCount(0),
                mFlags(0),
                mMailbox(-1),
                mOriginObject(ray.sourceObject.mObject)
        {
                if (ray.sourceObject.mObject)
                        mOrigin = ray.Extrap(ray.sourceObject.mT);
                else
                        mOrigin = ray.GetLoc(); 

                if (!ray.intersections.empty())
                {
                        mTermination = ray.Extrap(ray.intersections[0].mT);
                        mTerminationObject = ray.intersections[0].mObject;
                }
                else
                {
                        mTermination = 1e6;
                        mTerminationObject = NULL;
                }

                Precompute();
        }

  void Precompute() {
    mFlags = 0;
                Vector3 dir = GetDir();

#define BIDIRECTIONAL_RAY 0
#if BIDIRECTIONAL_RAY
                if (dir.y < 0) {
                        // swap objects and poits       
                        swap(mOriginObject, mTerminationObject);
                        swap(mOrigin, mTermination);
                        dir = -dir;
                }
#endif
                if (dir.x > 0.0f) mFlags |= FPosDirX;
    if (dir.y > 0.0f) mFlags |= FPosDirY;
    if (dir.z > 0.0f) mFlags |= FPosDirZ;

    mInvSize = 1.0f/Magnitude(GetDir());
  }

  void Mail() { mMailbox = mailID; }
  static void NewMail() { mailID++; }
  bool Mailed() const { return mMailbox == mailID; }

  bool Mailed(const int mail) {
    return mMailbox >= mailID + mail;
  }

        int HitCount() const {
#if BIDIRECTIONAL_RAY
                if (mOriginObject && mTerminationObject)
                        return 2;
                if (mOriginObject || mTerminationObject)
                        return 1;
                return 0;
#else
                return (mTerminationObject) ? 1 : 0;
#endif
        }
        
        Vector3 GetOrigin() const { return mOrigin; }
  Vector3 GetTermination() const { return mTermination; }
  Vector3 GetDir() const { return mTermination - mOrigin; }
  //  Vector3 GetNormalizedDir() const { return Normalize(termination - mOrigin); }
  Vector3 GetNormalizedDir() const { return (mTermination - mOrigin)*mInvSize; }

        float GetDirParametrization(const int axis) const;
        
        float GetInvSize() const { return  mInvSize; }
  float GetOrigin(const int axis) const { return mOrigin[axis]; }
  float GetTermination(const int axis) const { return mTermination[axis]; }
  float GetDir(const int axis) const { return mTermination[axis] - mOrigin[axis]; }
  float GetNormalizedDir(const int axis) const {
    return (mTermination[axis] - mOrigin[axis])*mInvSize;
  }
        
  bool
  ComputeMinMaxT(const AxisAlignedBox3 &box,
                                                                 float &tmin,
                                                                 float &tmax) const;
        
  bool
  Intersects(const AxisAlignedBox3 &box,
                                                 float &tmin,
                                                 float &tmax) const;
        
  bool
  IntersectsSphere(const Vector3 &center,
                                                                         const float sqrRadius,
                                                                         Vector3 &point,
                                                                         float &t) const;
        
  void
  Translate(const Vector3 &translation) {
    mOrigin += translation;
    mTermination += translation;
  }
        
  bool HasPosDir(const int axis) const { return mFlags & (1<<axis); }

  char Flags() const { return mFlags;}
  void SetFlags(char orFlag) { mFlags |= orFlag;}
  
  bool IsActive() const { return mRefCount>0; }
        
  // reference counting for leaf nodes
  int RefCount() const { return mRefCount; }
  int Ref() { return mRefCount++; }
        
  void ScheduleForRemoval() { if (mRefCount>0) mRefCount = -mRefCount; }
  bool ScheduledForRemoval() const { return mRefCount<0; }
  void Unref() {
    if (mRefCount > 0)
      mRefCount--;
    else
      if (mRefCount < 0)
                                mRefCount++;
      else {
                                cerr<<"Trying to unref already deleted ray!"<<endl;
                                exit(1);
      }
  }
};



typedef  vector<VssRay *> VssRayContainer;



#endif