#ifndef _VssPreprocessor_H__
#define _VssPreprocessor_H__

#include <fstream>
using namespace std;

#include "Preprocessor.h"
#include "VssRay.h"
class VssTree;

/** Sampling based visibility preprocessing. The implementation is based on heuristical
    sampling of view space */
class VssPreprocessor : public Preprocessor {
public:
	int mPass;
  int mSamplesPerPass;
  int mInitialSamples;
  int mVssSamples;
	bool mUseImportanceSampling;

	ofstream mStats;
	
  ObjectContainer mObjects;

	// rays cast during the processing
  VssRayContainer mVssRays;
	
  VssPreprocessor();
  ~VssPreprocessor();

  virtual bool ComputeVisibility();

	Vector3
	GetViewpoint(AxisAlignedBox3 *viewSpaceBox);

	Vector3
	GetDirection(const Vector3 &viewpoint);
	
  void
  SetupRay(Ray &ray, 
					 const Vector3 &point, 
					 const Vector3 &direction
					 );


	
	int
	CastRay(
					Vector3 &viewPoint,
					Vector3 &direction,
					VssRayContainer &vssRays

					);
		

	
	virtual bool BuildBspTree() { return false; }

	int
	RandomizedImportanceSampling(VssTree *vssTree, const int desiredSamples);

};



#endif