#ifndef __QTGLRENDERER_H
#define __QTGLRENDERER_H

#include <QtOpenGL>
#include <QWaitCondition>

//#include <QGLPixelBuffer>

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

class QWidget;

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; 
struct RenderCostSample;


class QtGlRendererBuffer : public QObject, public QGLPixelBuffer, public GlRendererBuffer
{
	Q_OBJECT
public:
	QtGlRendererBuffer(const int w,
		const int h,
		SceneGraph *sceneGraph,
		ViewCellsManager *viewcells,
		KdTree *tree);

	~QtGlRendererBuffer();

	/** 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);


  void
  EvalPvsStat();

  void
  ClearErrorBuffer();
  

  virtual int GetWidth() const { return width(); }
  virtual int GetHeight() const { return height(); }


 
  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;
     
   
private:
  	
	void SetupProjectionForViewPoint(const Vector3 &viewPoint, 
									 const Beam &beam, 
									 Intersectable *sourceObject);


public:
  signals:
	void UpdatePvsErrorItem(int i, GlRendererBuffer::PvsErrorEntry &);
};


class QtRendererControlWidget : public QWidget
{
  Q_OBJECT
public:

  QListWidget *mPvsErrorWidget;

  QtRendererControlWidget(QWidget * parent = 0, Qt::WFlags f = 0);

  public slots:

  void FocusNextPvsErrorFrame();
  void UpdatePvsErrorItem(int i,
						  GlRendererBuffer::PvsErrorEntry &);

  signals:
  
  void SetViewCellGranularity(int);
  void SetSceneCut(int);
  void SetTopDistance(int);
  void SetVisibilityFilterSize(int);
  void SetSpatialFilterSize(int);

  void SetRenderFilter(bool);
  void SetUseFilter(bool);
  void SetUseSpatialFilter(bool);
  void SetRenderErrors(bool);
  void SetShowViewCells(bool);
  void SetShowRenderCost(bool);
  void SetShowPvsSizes(bool);
  void SetTopView(bool);
  void SetCutViewCells(bool);
  void SetCutScene(bool);

  
};

class QtGlRendererWidget : public QGLWidget, public GlRendererWidget
{
  Q_OBJECT
public:

  // point of the last mouse click used for movement in the scene
  Vector3 mousePoint;

  bool mTopView;
  bool mRenderViewCells;
  bool mCutViewCells;
  bool mCutScene;
  bool mRenderErrors;
  bool mRenderFilter;
  bool mUseFilter;
  bool mUseSpatialFilter;
  bool mShowRenderCost;
  
  bool mShowPvsSizes;
  float mSpatialFilterSize;
  
  Plane3 mSceneCutPlane;
  float mTopDistance;

  // some statistics
  int mPvsSize;
  float mRenderError;

  QtRendererControlWidget *mControlWidget;
  
  QtGlRendererWidget(SceneGraph *sceneGraph,
					 ViewCellsManager *viewcells,
					 KdTree *tree,
					 QWidget * parent = 0, const QGLWidget * shareWidget = 0, Qt::WFlags f = 0
					 );
  
  QtGlRendererWidget() {};

  virtual void SetupCamera();

  void initializeGL() {
	InitGL();
  }
  void resizeGL(int w, int h);
  void paintGL();
  void timerEvent(QTimerEvent *) {
	  update();
  }

  void mousePressEvent(QMouseEvent *);
  void mouseReleaseEvent(QMouseEvent *);
  void mouseMoveEvent(QMouseEvent *);

  void keyPressEvent ( QKeyEvent * e ) ;

  void
  RenderPvs();

  float
  RenderErrors();
  void
  RenderInfo();

  virtual int GetWidth() const { return width(); }
  virtual int GetHeight() const { return height(); }

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

  void
  RenderViewCells();


  virtual void Show() {
	show();
  }

 public slots:

 void SetRenderErrors(bool b) {
   mRenderErrors = b;
   updateGL();
 }

 void SetRenderFilter(bool b) {
   mRenderFilter = b;
   updateGL();
 }

  void SetUseFilter(bool b) {
   mUseFilter = b;
   updateGL();
 }

  void SetUseSpatialFilter(bool b) {
	mUseSpatialFilter = b;
	updateGL();
  }

  
  void
  SetViewCellGranularity(int number);
  
  void
  SetVisibilityFilterSize(int number);

  void
  SetSpatialFilterSize(int number);
  
  void
  SetSceneCut(int cut);
  
  void
  SetTopDistance(int dist);
  
  void SetShowViewCells(bool b) {
	mRenderViewCells = b;
	updateGL();
  }

  void SetShowRenderCost(bool b) {
	mShowRenderCost = b;
	updateGL();
  }

  void SetShowPvsSizes(bool b) {
	mShowPvsSizes = b;
	updateGL();
  }

  void SetTopView(bool b) {
	mTopView = b;
	updateGL();
  }

  void SetCutViewCells(bool b) {
	mCutViewCells = b;
	updateGL();
  }
  void SetCutScene(bool b) {
	mCutScene = b;
	updateGL();
  }


};


class QtGlDebuggerWidget : public QGLWidget
{
	Q_OBJECT
public:
    QtGlDebuggerWidget(QtGlRendererBuffer *buf, QWidget *parent = NULL);
    ~QtGlDebuggerWidget();
    void initializeGL();
    void resizeGL(int w, int h);
    void paintGL();
    void timerEvent(QTimerEvent *) { update(); }
    void mousePressEvent(QMouseEvent *) { killTimer(timerId); }
    void mouseReleaseEvent(QMouseEvent *) { timerId = startTimer(20); }

    void initCommon();
    void initPbuffer();

  
	 QtGlRendererBuffer *mRenderBuffer;

	 Beam mBeam;
	 int mSamples;
	 Intersectable *mSourceObject;

private:
    GLuint dynamicTexture;
    int timerId;
};

extern QtGlDebuggerWidget *debuggerWidget;

};

#endif