#ifndef __GLRENDERER_H
#define __GLRENDERER_H

#include "Vector3.h"
#include "Containers.h"
#include "Halton.h"
#include "Renderer.h"
#include "Beam.h"


namespace GtpVisibilityPreprocessor {

class SceneGraph;
class ViewCellsManager;
class Mesh;
class MeshInstance;
class Intersectable;
class Material;
class Beam;
class KdTree;
class GlRendererBuffer;
class BeamSampleStatistics;
class OcclusionQuery;
class TransformedMeshInstance;

struct VssRayContainer;

struct PvsRenderStatistics {
  
  float maxError;
  float sumError;
  int sumPvsSize;
  int frames;
  int errorFreeFrames;

  PvsRenderStatistics() { Reset(); }
  
  void Reset() {
	maxError = 0.0f;
	sumError = 0.0f;
	frames = 0;
	errorFreeFrames = 0;
	sumPvsSize = 0;
  }

  float GetMaxError() { return maxError; }
  float GetAvgError() { return sumError/frames; }
  float GetErrorFreeFrames() { return errorFreeFrames/(float)frames; }
  float GetAvgPvs() { return sumPvsSize/(float)frames; }
  
};

struct RenderCostSample {

  RenderCostSample() {}

  void Reset() {
	mVisibleObjects = 0;
	mVisiblePixels = 0;
  }
  
  Vector3 mPosition;

  // visible object from the given point
  int mVisibleObjects;

  // visible pixels
  int mVisiblePixels;
  
};

/** Class encapsulating gl rendering for the scene.
	There is no gl context binding so the binding is performed in the
	derived classes
*/
class GlRenderer: public Renderer
{

public:

  GlRenderer(SceneGraph *sceneGraph,
			 ViewCellsManager *viewcells,
			 KdTree *tree);
  
  GlRenderer() {}

  virtual ~GlRenderer();


  void SetupFalseColor(const int id);
  void RenderIntersectable(Intersectable *);
  void RenderViewCell(ViewCell *vc);
  void RenderMeshInstance(MeshInstance *mi);
  void RenderTransformedMeshInstance(TransformedMeshInstance *mi);
  void RenderMesh(Mesh *m);
  void SetupMaterial(Material *m);
  virtual void SetupCamera();
  
  bool
  RenderScene();

  void
  _RenderScene();


  virtual void
  SetupProjection(const int w, const int h, const float angle = 70.0f);

  
  

  void InitGL();

  virtual int GetWidth() const = 0;
  virtual int GetHeight() const = 0;

  int GetId(int r, int g, int b) const;

  inline const bool GetSnapErrorFrames() { return mSnapErrorFrames; }
  inline const string GetSnapPrefix() { return mSnapPrefix; }

  inline void SetSnapErrorFrames(bool snapframes) { mSnapErrorFrames = snapframes; }
  inline void SetSnapPrefix(const string &pref) { mSnapPrefix = pref; }

protected:


  vector<OcclusionQuery *> mOcclusionQueries;

  ObjectContainer mObjects;
   
  Vector3 mViewPoint;
  Vector3 mViewDirection;

  int timerId;
  bool mUseFalseColors;
  bool mUseForcedColors;

  HaltonSequence halton;
  
  int mFrame;
  bool mWireFrame;
  
  bool mDetectEmptyViewSpace;
  bool mSnapErrorFrames;

  bool mUseGlLists;
  
  string mSnapPrefix;

  KdTree *mKdTree;

};

/* Class implementing an OpenGl render buffer.
*/
class GlRendererBuffer: public GlRenderer
{

public:

GlRendererBuffer(SceneGraph *sceneGraph,
				 ViewCellsManager *viewcells,
				 KdTree *tree);


	/** Evaluates render cost of a point sample.
		@param sample the render cost sample to be evaluated
		@param useOcclusionQueries if occlusion queries should be used or item buffer
		@param threshold number of pixels / samples from where an object is considered visible.
	*/
	void EvalRenderCostSample(RenderCostSample &sample,
							  const bool useOcclusionQueries,
							  const int threshold);

	/** Evaluates render cost of a number of point samples. The point samples
		are distributed uniformly over the defined view space.

		@param numSamples the number of point samples taken
		@param samples stores the taken point samples in a container
		@param useOcclusionQueries if occlusion queries should be used or item buffer
		@param threshold number of pixels / samples from where an object is considered visible.
	*/
	void SampleRenderCost(const int numSamples, 
						  vector<RenderCostSample> &samples,
						  const bool useOcclusionQueries,
						  const int threshold = 0)
	{}

	/** Implerment in subclasses.
	*/
	void EvalPvsStat() {};

	void ClearErrorBuffer();
  

  virtual int GetWidth() const { return 0; }
  virtual int GetHeight() const { return 0; }


  void RandomViewPoint();
  void SampleBeamContributions(
							   Intersectable *sourceObject,
							   Beam &beam,
							   const int samples,
							   BeamSampleStatistics &stat
							   );

  void
  SampleViewpointContributions(
							   Intersectable *sourceObject,
							   const Vector3 viewPoint,
							   Beam &beam,
							   const int desiredSamples,
							   BeamSampleStatistics &stat
							   );

  void InitGL();

  /** Computes rays from information gained with hw sampling-
  */
  void ComputeRays(Intersectable *sourceObj, VssRayContainer &rays);

  int ComputePvs() const;

  float
  GetPixelError(int &pvsSize);

  int ComputePvs(ObjectContainer &objects, ObjectContainer &pvs) const;

  PvsRenderStatistics mPvsStat;
   
  int mPvsStatFrames;
  struct PvsErrorEntry {
	  PvsErrorEntry() {}
	  float mError;
	  int mPvsSize;
	  Vector3 mPosition;
	  Vector3 mDirection;
  };
  
  vector<PvsErrorEntry> mPvsErrorBuffer;

  
protected:
	unsigned int *mPixelBuffer;
  
	static void GenQueries(const int numQueries);
	
	void SetupProjectionForViewPoint(const Vector3 &viewPoint, 
									 const Beam &beam, 

									 Intersectable *sourceObject);

	/** Evaluates query for one direction using item buffer.
	*/
	void EvalQueryWithItemBuffer();

	/** Evaluates query for one direction using occlusion queries.
	*/
	void EvalQueryWithOcclusionQueries();

public:
	// matt: remove qt dependencies
 // signals:
//	void UpdatePvsErrorItem(int i, GlRendererBuffer::PvsErrorEntry &);
};


/** Abstract class for implmenenting a gl render widget.
*/
class GlRendererWidget: public GlRenderer
{
public:
	
	GlRendererWidget(SceneGraph *sceneGraph, ViewCellsManager *vcm, KdTree *kdTree):
	  GlRenderer(sceneGraph, vcm, kdTree)
	{}

    GlRendererWidget() {}

    virtual ~GlRendererWidget() {}

	//virtual void Create() {}
	virtual void Show() {}
	

protected:


	SceneGraph *mSceneGraph;
	ViewCellsManager *mViewCellsManager;
	KdTree *mKdTree;
};

//extern GlRendererWidget *rendererWidget;

};

#endif