source: GTP/trunk/Lib/Vis/Preprocessing/src/Beam.h @ 2176

#ifndef __BEAM_H
#define __BEAM_H

#include <vector>
#include "AxisAlignedBox3.h"
#include "Statistics.h"


namespace GtpVisibilityPreprocessor {

class KdNode;
class Intersectable;
class Mesh;


// the values need for rss tree update computed already inside the glrendererbuffer
// not all of them need to be computed
class BeamSampleStatistics: public StatisticsBase
{
public:
        enum {COMPUTE_PVS_SIZE, COMPUTE_RAY_CONTRIBUTIONS, COMPUTE_PVS_ENTROPY};
        int flags;

        BeamSampleStatistics(): flags(COMPUTE_RAY_CONTRIBUTIONS) 
        {
                Reset();
        }
        
        float pvsSize;
        float rays;
        float rayContributions;
        float pvsEntropy;
        float rayLengthEntropy;
        float importance;
        
        float weightedRayContribution;

        void Reset() 
        {
                pvsSize = 0;
                rays = 0;
                rayContributions = 0;
                pvsEntropy = 0;
                rayLengthEntropy = 0;
                importance = 0;
        }

        void Print(std::ostream &app) const;

        friend std::ostream &operator<<(std::ostream &s, const BeamSampleStatistics &stat) 
        {
                stat.Print(s);
                return s;
        }  
};

  
class Beam {
  
public:                 
  enum {STORE_KD_NODES=1, STORE_OBJECTS=2, STORE_VIEW_CELLS, VALID=8};
  int mFlags;
  
  // list of nodes intersected by the frustum
  vector<KdNode *> mKdNodes;
  // list of objects intersected by the frustum
  ObjectContainer mObjects;
  // view cells intersected by frustum
  ViewCellContainer mViewCells;

  // spatial box
  AxisAlignedBox3 mBox;
  // directional box (it is actually a 2D box - only x and y ranges are valid)
  // directional parametrization according to VssRay::GetDirParametrization
  AxisAlignedBox3 mDirBox;

  vector<Plane3> mPlanes;

  Mesh *mMesh;
    
  /** Constructs a beam from a spatial and a directional box.
  */
  void Construct(const AxisAlignedBox3 &box,
                             const AxisAlignedBox3 &dBox);
  
  /** Computes parameters for glFrustum.
  */
  void ComputePerspectiveFrustum(float &left, float &right,
                                                                 float &bottom, float &top,
                                                                 float &near, float &far,
                                                                 const AxisAlignedBox3 &sceneBBox) const;

  /** Computes parameters for glOrtho.
  */
  void ComputeOrthoFrustum(float &left, float &right,
                                                   float &bottom, float &top,
                                                   float &near, float &far,
                                                   const AxisAlignedBox3 &sceneBBox) const;

  int ComputeIntersection(const AxisAlignedBox3 &box);

  Vector3 GetMainDirection() const;

  bool IsValid() { return mFlags & VALID; }
  bool SetValid() { return mFlags |= VALID; }

  Beam():mFlags(STORE_KD_NODES+STORE_OBJECTS), mKdNodes(0), mObjects(0), mViewCells(0), mMesh(NULL)
  {
  }

  ~Beam();

  /** Creates beam mesh bounded at zfar.
  */
  void CreateMesh(const float zfar);
};

}

#endif