source: trunk/VUT/GtpVisibilityPreprocessor/src/SamplingPreprocessor.h @ 373

#ifndef _SamplingPreprocessor_H__
#define _SamplingPreprocessor_H__

#include <fstream>
using namespace std;

#include "Preprocessor.h"


/** Sampling based visibility preprocessing. The implementation is based on heuristical
    sampling of view space */
class SamplingPreprocessor : public Preprocessor {
public:
                
  SamplingPreprocessor();

  ~SamplingPreprocessor();

  virtual bool ComputeVisibility();

protected:
        int mPass;

  int mSamplesPerPass;
  int mTotalSamples;
  int mKdPvsDepth;
  ofstream mStats;
  ObjectContainer mObjects;
  RayContainer mSampleRays;
  int mBspConstructionSamples;
  int mPostProcessSamples;


  void
  SetupRay(Ray &ray, 
                   const Vector3 &point, 
                   const Vector3 &direction,
                   const int type);

  KdNode *
  GetNodeForPvs(KdLeaf *leaf);

        int
        AddNodeSamples(const Ray &ray,
                                                                 Intersectable *sObject,
                                                                 Intersectable *tObject
                                                                 );

  void
  HoleSamplingPass();

        int
        CastRay(Intersectable *object,
                                        Ray &ray);
        
        KdNode *
        GetNodeToSample(Intersectable *object);
        void
        VerifyVisibility(Intersectable *object);

        int
        CastEdgeSamples(
                                                                        Intersectable *object,
                                                                        const Vector3 &point,
                                                                        MeshInstance *mi,
                                                                        const int samples
                                                                        );

        /** Processes the BSP based view cells during a pass.
                
                @param ray the current ray
                @param object the currently processed object
                @param faceIndex the sampled face of the object
                @param contributingSamples samples contributing to pvs
                @param sampleContributions contribution of the samples

                @returns true if BSP tree has been constructed, false if not yet

        */
        bool ProcessBspViewCells(Ray &ray,
                                                         Intersectable *object,
                                                         int faceIndex,
                                                         int &contributingSamples,
                                                         int &sampleContributions);

        /** Adds objects samples to bsp view cells.
        */
        int AddObjectSamples(Intersectable *obj, const Ray &ray);

        bool BuildBspTree();

        void ExportSplits(const ObjectContainer &objects);

        void ExportBspPvs(const ObjectContainer &objects);

        /** Post processes view cells (i.e., merges or subdivides view cells based
                on the PVS and the ray sets.
                @param rays a set of rays which carries the visibility information 
                the merging / subdivision is based on.
                @returns number of merged view cells.
        */
        int PostprocessViewCells(const RayContainer &rays);

        /** Simulated rendering using a simple render heuristics. Used to evaluate the 
                quality of the view cell partition.
        */
        Real SimulateRendering();
        /** Simulates rendering of the pvs of one view cell, with given rendering time for an object.
                @param viewCell the view cell holding the Pvs
                @param objRenderTime estimated render time for one object of the Pvs
        */
        Real RenderPvs(ViewCell &viewCell, const float objRenderTime) const;

};



#endif