source: GTP/trunk/Lib/Vis/Preprocessing/src/Intersectable.h @ 1579

#ifndef __INTERSECTABLE_H
#define __INTERSECTABLE_H

#include "AxisAlignedBox3.h"
#include "Pvs.h"
#include <set>
#include "VssRay.h"

namespace GtpVisibilityPreprocessor {

struct VssRayContainer;
class KdLeaf;
class BvhLeaf;

class Intersectable;
struct Face;


struct FaceParentInfo {
        /// intersectable
        Intersectable *mObject;
        /// face index
        int mFaceIndex;

        FaceParentInfo(Intersectable *obj, const int fi):
        mObject(obj), mFaceIndex(fi)
        {}
};


class Intersectable {
public:
  // last mail id -> warning not thread safe!
  // both mailId and mailbox should be unique for each thread!!!
  static int sMailId;
  static int sReservedMailboxes;

  /// Mailbox used for traversals
  int mMailbox;
  
  /// unique object Id
  int mId;

  /// universal counter
  int mCounter;

  /// pointer to the container bvh leaf
  BvhLeaf *mBvhLeaf;

  /// some rays piercing this intersectable
  VssRayContainer mVssRays;

  /// # of references to this instance
  int mReferences;

  //////////////////
  // note matt: delete these, they are only taking memory+


  /// object based pvs
  KdPvs mKdPvs;

  /// view cell based pvs per object
  ViewCellPvs mViewCellPvs;
        
  ///////////////////////

  enum { MESH_INSTANCE, 
                 TRANSFORMED_MESH_INSTANCE, 
                 SPHERE, 
                 VIEW_CELL, 
                 OGRE_MESH_INSTANCE,
                 KD_INTERSECTABLE,
                 BVH_INTERSECTABLE,
                 TRIANGLE_INTERSECTABLE
                };
  
  Intersectable(): mMailbox(0), mReferences(0), mBvhLeaf(0) {}

  void SetId(const int id) { mId = id; }
  int GetId() { return mId; }
  
  ////////////////////////////////////////////////
  //    Mailing stuff
  
  static void NewMail(const int reserve = 1) {
        sMailId += sReservedMailboxes;
        sReservedMailboxes = reserve;
  }
        
  void Mail() { mMailbox = sMailId; }
  bool Mailed() const { return mMailbox == sMailId; }
  
  void Mail(const int mailbox) { mMailbox = sMailId + mailbox; }
  bool Mailed(const int mailbox) const { return mMailbox == sMailId + mailbox; }
  
  int IncMail() { return ++ mMailbox - sMailId; }

  ////////////////////////////////////////////////////
  virtual AxisAlignedBox3 GetBox() const = 0;
  virtual int CastRay(GtpVisibilityPreprocessor::Ray &ray) = 0;
  
  virtual bool IsConvex() const = 0;
  virtual bool IsWatertight() const = 0;
  virtual float IntersectionComplexity() = 0;
  
  virtual int NumberOfFaces() const = 0;
  virtual int Type() const = 0;
  
  virtual int GetRandomSurfacePoint(Vector3 &point, Vector3 &normal) = 0;
  
        virtual int GetRandomVisibleSurfacePoint(Vector3 &point,
                                                                                         Vector3 &normal,
                                                                                         const Vector3 &viewpoint,
                                                                                         const int maxTries) = 0;
  
        virtual ostream &Describe(ostream &s) = 0;
        
        virtual int GenerateSilhouetteRays(const int nrays,
                                                                           const AxisAlignedBox3 &originBox,
                                                                           const AxisAlignedBox3 &directionBox, VssRayContainer &rays) 
        {
                return 0;
        }

        static bool GreaterCounter(const Intersectable *a,
                                                         const Intersectable *b) 
        {
                return a->mCounter > b->mCounter;
        }

        static string GetTypeName(Intersectable *obj)
        {
                switch(obj->Type())
                {
                case MESH_INSTANCE:
                        return "mesh_instance\n";
                
                case TRANSFORMED_MESH_INSTANCE:
                        return "transformed_mesh_instance\n";
                        
                case SPHERE:
                        return "sphere\n";

                case VIEW_CELL:
                        return "view cell\n";
                
                case OGRE_MESH_INSTANCE:
                        return "ogre_mesh_instance\n";

                case KD_INTERSECTABLE:
                        return "kd_intersectable\n";

                default:
                        return "unknown\n";
                }
        }

        /** returns normal from the face with the specified index.
                PROBLEM: Does not fit to all intersectable types (e.g., spheres)
        */
        virtual Vector3 GetNormal(const int idx) const { return Vector3(0, 0, 0); }
};


}

#endif