#include "Mesh.h"
#include "glInterface.h"
#include "OcclusionQuery.h"
#include "QtGlRenderer.h"
#include "ViewCellsManager.h"
#include "SceneGraph.h"
#include "Pvs.h"
#include "Viewcell.h"
#include "Beam.h"
#include "KdTree.h"
#include "Environment.h"
#include "RssPreprocessor.h"
#include "RssTree.h"
#include "Trackball.h"
#include "QtPreprocessorThread.h"


#include <Cg/cg.h>
#include <Cg/cgGL.h>

#include <QVBoxLayout>

namespace GtpVisibilityPreprocessor {


#define CAMERA_VIEW_WIDTH 0.5f
  
class ViewCellsManager;

static CGcontext sCgContext = NULL;
static CGprogram sCgFragmentProgram = NULL;
static CGprofile sCgFragmentProfile;

GLuint frontDepthMap;
GLuint backDepthMap;

const int depthMapSize = 512;

//static vector<OcclusionQuery *> sQueries;

QtGlRendererWidget *rendererWidget = NULL;
QtGlDebuggerWidget *debuggerWidget = NULL;


static inline bool ilt(Intersectable *obj1, Intersectable *obj2)
{
	return obj1->mId < obj2->mId;
}


static void handleCgError() 
{
    Debug << "Cg error: " << cgGetErrorString(cgGetError()) << endl;
    exit(1);
}

void
QtGlRendererBuffer::EvalRenderCostSample(RenderCostSample &sample,
										 const bool useOcclusionQueries,
										 const int threshold
										 )
{
	// choose a random view point
	mViewCellsManager->GetViewPoint(mViewPoint);
	sample.mPosition = mViewPoint;
	//cout << "viewpoint: " << mViewPoint << endl;

	// take a render cost sample by rendering a cube
	Vector3 directions[6];

	directions[0] = Vector3(1,0,0);
	directions[1] = Vector3(0,1,0);
	directions[2] = Vector3(0,0,1);
	directions[3] = Vector3(-1,0,0);
	directions[4] = Vector3(0,-1,0);
	directions[5] = Vector3(0,0,-1);

	sample.mVisibleObjects = 0;

	// reset object counters
	ObjectContainer::const_iterator it, it_end = mObjects.end();

	for (it = mObjects.begin(); it != it_end; ++ it) 
	{
		(*it)->mCounter = 0;
	}

	++ mFrame;

	//glCullFace(GL_FRONT);
	glCullFace(GL_BACK);
	glDisable(GL_CULL_FACE);
	

	// query all 6 directions for a full point sample
	for (int i = 0; i < 6; ++ i) 
	{
		mViewDirection = directions[i];
		SetupCamera();

		glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
		//glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);	glDepthMask(GL_TRUE);
		glDepthFunc(GL_LESS);

		mUseFalseColors = true;

		// the actual scene rendering fills the depth (for occlusion queries)
		// and the frame buffer (for item buffer)
		RenderScene();


		if (0) 
		{
			char filename[256];
			sprintf(filename, "snap/frame-%04d-%d.png", mFrame, i);
			QImage im = toImage();
			im.save(filename, "PNG");
		}
         
		// evaluate the sample
		if (useOcclusionQueries) 
		{
			EvalQueryWithOcclusionQueries();
		}
		else 
		{
			EvalQueryWithItemBuffer();
		}
	}  

	// now evaluate the statistics over that sample
	// currently only the number of visible objects is taken into account
	sample.Reset();

	for (it = mObjects.begin(); it != it_end; ++ it) 
	{
		Intersectable *obj = *it;
		if (obj->mCounter >= threshold) 
		{
			++ sample.mVisibleObjects;
			sample.mVisiblePixels += obj->mCounter;
		}
	}

	//cout << "RS=" << sample.mVisibleObjects << " ";
}


QtGlRendererBuffer::~QtGlRendererBuffer()
{
	if (sCgFragmentProgram)
		cgDestroyProgram(sCgFragmentProgram);
	if (sCgContext)
		cgDestroyContext(sCgContext);
}


void
QtGlRendererBuffer::SampleRenderCost(const int numSamples,
									 vector<RenderCostSample> &samples,
									 const bool useOcclusionQueries,
									 const int threshold
									 )
{
  makeCurrent();

  if (mPixelBuffer == NULL)
	  mPixelBuffer = new unsigned int[GetWidth()*GetHeight()];
  
  // using 90 degree projection to capture 360 view with 6 samples
  SetupProjection(GetHeight(), GetHeight(), 90.0f);

  //samples.resize(numSamples);
  halton.Reset();
  
  // the number of queries queried in batch mode
  const int numQ = 500;

  //const int numQ = (int)mObjects.size();
  if (useOcclusionQueries)
  {
	  cout << "\ngenerating " << numQ << " queries ... ";
	  OcclusionQuery::GenQueries(mOcclusionQueries, numQ);
	  cout << "finished" << endl;
  }

  // sampling queries 
  for (int i = 0; i < numSamples; ++ i)
  {
	  cout << ".";
	  EvalRenderCostSample(samples[i], useOcclusionQueries, threshold);
  }

  doneCurrent();

}
  


QtGlRendererBuffer::QtGlRendererBuffer(const int w,
									   const int h,
									   SceneGraph *sceneGraph,
									   ViewCellsManager *viewcells,
									   KdTree *tree):
  QGLPixelBuffer(QSize(w, h)), GlRendererBuffer(sceneGraph, viewcells, tree) {
  
  Environment::GetSingleton()->GetIntValue("Preprocessor.pvsRenderErrorSamples", mPvsStatFrames);
  mPvsErrorBuffer.resize(mPvsStatFrames);
  ClearErrorBuffer();

  mPixelBuffer = NULL;
  
  makeCurrent();
  InitGL();
  doneCurrent();
  
}

float
QtGlRendererBuffer::GetPixelError(int &pvsSize)
{
  float pErrorPixels = -1.0f;
  
  glReadBuffer(GL_BACK);
  
  //  mUseFalseColors = true;
  
  mUseFalseColors = false;
  unsigned int pixelCount;

  //static int query = -1;
  //if (query == -1)
//	  glGenOcclusionQueriesNV(1, (unsigned int *)&query);

  OcclusionQuery query;

  if (mDetectEmptyViewSpace) {
	// now check whether any backfacing polygon would pass the depth test
	SetupCamera();
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glEnable( GL_CULL_FACE );
	
	RenderScene();
	
	glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
	glDepthMask(GL_FALSE);
	glDisable( GL_CULL_FACE );

	
	query.BeginQuery();
	
	RenderScene();
	
	query.EndQuery();
	
	// at this point, if possible, go and do some other computation
	glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
	glDepthMask(GL_TRUE);
	glEnable( GL_CULL_FACE );
	
	// reenable other state
	pixelCount = query.GetQueryResult();
	
	if (pixelCount > 0)
	  return -1.0f; // backfacing polygon found -> not a valid viewspace sample
  } else
	glDisable( GL_CULL_FACE );
	

  ViewCell *viewcell = NULL;
  
  PrVs prvs;
  
  mViewCellsManager->SetMaxFilterSize(0);
  mViewCellsManager->GetPrVS(mViewPoint, prvs, mViewCellsManager->GetFilterWidth());
  viewcell = prvs.mViewCell;
  
  //  ViewCell *viewcell = mViewCellsManager->GetViewCell(mViewPoint);
  pvsSize = 0;
  if (viewcell) {
	SetupCamera();
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	glColorMask(GL_FALSE, GL_TRUE, GL_FALSE, GL_FALSE);
	
	// Render PVS
	ObjectPvsMap::const_iterator it = viewcell->GetPvs().mEntries.begin();

	pvsSize = viewcell->GetPvs().mEntries.size();
	
	for (; it != viewcell->GetPvs().mEntries.end(); ++ it) {
	  Intersectable *object = (*it).first;
	  RenderIntersectable(object);
	}

	//	glColorMask(GL_TRUE, GL_FALSE, GL_FALSE, GL_FALSE);
	glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
	mUseFalseColors = true;

	query.BeginQuery();

	SetupCamera();

	RenderScene();
	
	query.EndQuery();
	

	unsigned int pixelCount;
	// reenable other state
	pixelCount = query.GetQueryResult();
	
	
	pErrorPixels = ((float)pixelCount)/(GetWidth()*GetHeight());
	if (mSnapErrorFrames && pErrorPixels > 0.01) {
	  
	  char filename[256];
	  sprintf(filename, "error-frame-%04d-%0.5f.png", mFrame, pErrorPixels);
	  QImage im = toImage();
	  string str = mSnapPrefix + filename;
	  QString qstr(str.c_str());

	  im.save(qstr, "PNG");
	  if (1) { //0 && mFrame == 1543) {
		int x,y;
		int lastIndex = -1;
		for (y=0; y < im.height(); y++)
		  for (x=0; x < im.width(); x++) {
			QRgb p = im.pixel(x,y);
			int index = qRed(p) + (qGreen(p)<<8) + (qBlue(p)<<16);
			if (qGreen(p) != 255 && index!=0) {
			  if (index != lastIndex) {
				//				Debug<<"ei="<<index<<" ";
				lastIndex = index;
			  }
			}
		  }
	  }


	  mUseFalseColors = false;
	  glPushAttrib(GL_CURRENT_BIT);
	  glColor3f(0,1,0);
	  glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
	  SetupCamera();
	  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	  
	  // Render PVS
	  ObjectPvsMap::const_iterator it = viewcell->GetPvs().mEntries.begin();
	  
	  for (; it != viewcell->GetPvs().mEntries.end(); ++ it) {
		Intersectable *object = (*it).first;
		RenderIntersectable(object);
	  }

	  im = toImage();
	  sprintf(filename, "error-frame-%04d-%0.5f-pvs.png", mFrame, pErrorPixels);
	  str = mSnapPrefix + filename;
	  qstr = str.c_str();
	  im.save(qstr, "PNG");
	  glPopAttrib();
	}
	glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
  }

  if (viewcell && mViewCellsManager->GetMaxFilterSize() > 0)
	mViewCellsManager->DeleteLocalMergeTree(viewcell);
  
  return pErrorPixels;
}


void
QtGlRendererBuffer::ClearErrorBuffer()
{
  for (int i=0; i < mPvsStatFrames; i++) {
	mPvsErrorBuffer[i].mError = 1.0f;
  }
}


void
QtGlRendererBuffer::EvalPvsStat()
{
  mPvsStat.Reset();
  halton.Reset();

  makeCurrent();

  SetupProjection(GetWidth(), GetHeight());
  
  for (int i=0; i < mPvsStatFrames; i++) {
	float err;
	// set frame id for saving the error buffer
	mFrame = i;
	RandomViewPoint();

	// atlanta problematic frames: 325 525 691 1543
#if 0
	if (mFrame != 325 &&
		mFrame != 525 &&
		mFrame != 691 &&
		mFrame != 1543)
	  mPvsErrorBuffer[i] = -1;
	else {
	  Debug<<"frame ="<<mFrame<<" vp="<<mViewPoint<<" vd="<<mViewDirection<<endl;
	}
#endif
	if (mPvsErrorBuffer[i].mError > 0.0f) {
	  int pvsSize;


	  float error = GetPixelError(pvsSize);
	  mPvsErrorBuffer[i].mError = error;
	  mPvsErrorBuffer[i].mPvsSize = pvsSize;

	  emit UpdatePvsErrorItem(i,
							  mPvsErrorBuffer[i]);
	  
	  cout<<"("<<i<<","<<mPvsErrorBuffer[i].mError<<")";
	  //	  swapBuffers();
	}
	
	err = mPvsErrorBuffer[i].mError;
	
	if (err >= 0.0f) {
	  if (err > mPvsStat.maxError)
		mPvsStat.maxError = err;
	  mPvsStat.sumError += err;
	  mPvsStat.sumPvsSize += mPvsErrorBuffer[i].mPvsSize;
	  
	  if (err == 0.0f)
		mPvsStat.errorFreeFrames++;
	  mPvsStat.frames++;
	}
  }

  glFinish();
  doneCurrent();

  cout<<endl<<flush;
  //  mRenderingFinished.wakeAll();
}







void QtGlRendererBuffer::SampleBeamContributions(Intersectable *sourceObject,
											   Beam &beam,
											   const int desiredSamples,
											   BeamSampleStatistics &stat)
{
	// TODO: should be moved out of here (not to be done every time)
	// only back faces are interesting for the depth pass
	glShadeModel(GL_FLAT);
	glDisable(GL_LIGHTING);

	// needed to kill the fragments for the front buffer
	glEnable(GL_ALPHA_TEST);
	glAlphaFunc(GL_GREATER, 0);

	// assumes that the beam is constructed and contains kd-tree nodes
	// and viewcells which it intersects
  
  
	// Get the number of viewpoints to be sampled
	// Now it is a sqrt but in general a wiser decision could be made.
	// The less viewpoints the better for rendering performance, since less passes
	// over the beam is needed.
	// The viewpoints could actually be generated outside of the bounding box which
	// would distribute the 'efective viewpoints' of the object surface and thus
	// with a few viewpoints better sample the viewpoint space....

	//TODO: comment in
	//int viewPointSamples = sqrt((float)desiredSamples);
	int viewPointSamples = max(desiredSamples / (GetWidth() * GetHeight()), 1);
	
	// the number of direction samples per pass is given by the number of viewpoints
	int directionalSamples = desiredSamples / viewPointSamples;
	
	Debug << "directional samples: " << directionalSamples << endl;
	for (int i = 0; i < viewPointSamples; ++ i) 
	{
		Vector3 viewPoint = beam.mBox.GetRandomPoint();
		
		// perhaps the viewpoint should be shifted back a little bit so that it always lies
		// inside the source object
		// 'ideally' the viewpoints would be distributed on the soureObject surface, but this
        // would require more complicated sampling (perhaps hierarchical rejection sampling of
		// the object surface is an option here - only the mesh faces which are inside the box
		// are considered as candidates) 
		
		SampleViewpointContributions(sourceObject,
									 viewPoint,
									 beam,
									 directionalSamples,
									 stat);
	}


	// note:
	// this routine would be called only if the number of desired samples is sufficiently
	// large - for other rss tree cells the cpu based sampling is perhaps more efficient
	// distributing the work between cpu and gpu would also allow us to place more sophisticated
	// sample distributions (silhouette ones) using the cpu and the jittered once on the GPU
	// in order that thios scheme is working well the gpu render buffer should run in a separate
	// thread than the cpu sampler, which would not be such a big problem....

	// disable alpha test again
	glDisable(GL_ALPHA_TEST);
}



void QtGlRendererBuffer::SampleViewpointContributions(Intersectable *sourceObject,
													const Vector3 viewPoint,
													Beam &beam,
													const int samples,
                                                    BeamSampleStatistics &stat)
{
    // 1. setup the view port to match the desired samples
	glViewport(0, 0, samples, samples);

	// 2. setup the projection matrix and view matrix to match the viewpoint + beam.mDirBox
	SetupProjectionForViewPoint(viewPoint, beam, sourceObject);


	// 3. reset z-buffer to 0 and render the source object for the beam
	//    with glCullFace(Enabled) and glFrontFace(GL_CW)
	//    save result to the front depth map
	//    the front depth map holds ray origins


	// front depth buffer must be initialised to 0
	float clearDepth;
	
	glGetFloatv(GL_DEPTH_CLEAR_VALUE, &clearDepth);
	glClearDepth(0.0f);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);


	//glFrontFace(GL_CW);
	glEnable(GL_CULL_FACE);
	glCullFace(GL_FRONT);
	glColorMask(0, 0, 0, 0);
	

	// stencil is increased where the source object is located
	glEnable(GL_STENCIL_TEST);	
	glStencilFunc(GL_ALWAYS, 0x1, 0x1);
	glStencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE);


#if 0
	static int glSourceObjList = -1;	 
	if (glSourceObjList != -1) 
	{
		glSourceObjList = glGenLists(1);
		glNewList(glSourceObjList, GL_COMPILE);

		RenderIntersectable(sourceObject);
	
		glEndList();
	}
	glCallList(glSourceObjList);

#else
	RenderIntersectable(sourceObject);

#endif	

	 // copy contents of the front depth buffer into depth texture
	glBindTexture(GL_TEXTURE_2D, frontDepthMap);	
	glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, depthMapSize, depthMapSize);


	// reset clear function
	glClearDepth(clearDepth);

	
	
	// 4. set up the termination depth buffer (= standard depth buffer)
	//    only rays which have non-zero entry in the origin buffer are valid since
	//    they realy start on the object surface (this is tagged by setting a
	//    stencil buffer bit at step 3).
	
	glStencilFunc(GL_EQUAL, 0x1, 0x1);
	glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);

	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glDepthMask(1);

	glEnable(GL_DEPTH_TEST);
		
	glEnable(GL_CULL_FACE);
	glCullFace(GL_BACK);

	// setup front depth buffer
	glEnable(GL_TEXTURE_2D);
	
	// bind pixel shader implementing the front depth buffer functionality
	cgGLBindProgram(sCgFragmentProgram);
	cgGLEnableProfile(sCgFragmentProfile);


	// 5. render all objects inside the beam 
	//    we can use id based false color to read them back for gaining the pvs

	glColorMask(1, 1, 1, 1);

	
	// if objects not stored in beam => extract objects
	if (beam.mFlags & !Beam::STORE_OBJECTS)
	{
		vector<KdNode *>::const_iterator it, it_end = beam.mKdNodes.end();

		Intersectable::NewMail();
		for (it = beam.mKdNodes.begin(); it != it_end; ++ it)
		{
			mKdTree->CollectObjects(*it, beam.mObjects);
		}
	}


	//    (objects can be compiled to a gl list now so that subsequent rendering for
	//    this beam is fast - the same hold for step 3)
	//    Afterwards we have two depth buffers defining the ray origin and termination
	

#if 0
	static int glObjList = -1; 
	if (glObjList != -1) 
	{
		glObjList = glGenLists(1);
		glNewList(glObjList, GL_COMPILE);
	
		ObjectContainer::const_iterator it, it_end = beam.mObjects.end();
		for (it = beam.mObjects.begin(); it != it_end; ++ it)
		{
			// render all objects except the source object
			if (*it != sourceObject)
				RenderIntersectable(*it);
		}
		
		glEndList();
	}

	glCallList(glObjList);
#else
	ObjectContainer::const_iterator it, it_end = beam.mObjects.end();
	for (it = beam.mObjects.begin(); it != it_end; ++ it)
	{	
		// render all objects except the source object
		if (*it != sourceObject)
			RenderIntersectable(*it);
	}
#endif
	
   

	// 6. Use occlusion queries for all viewcell meshes associated with the beam ->
	//     a fragment passes if the corresponding stencil fragment is set and its depth is
	//     between origin and termination buffer

	// create new queries if necessary
	OcclusionQuery::GenQueries(mOcclusionQueries, (int)beam.mViewCells.size());

	// check whether any backfacing polygon would pass the depth test?
	// matt: should check both back /front facing because of dual depth buffer
	// and danger of cutting the near plane with front facing polys.
	
	glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
	glDepthMask(GL_FALSE);
	glDisable(GL_CULL_FACE);

  
	ViewCellContainer::const_iterator vit, vit_end = beam.mViewCells.end();

	int queryIdx = 0;

	for (vit = beam.mViewCells.begin(); vit != vit_end; ++ vit)
	{
		mOcclusionQueries[queryIdx ++]->BeginQuery();

		RenderIntersectable(*vit);
		
		mOcclusionQueries[queryIdx]->EndQuery();

		++ queryIdx;
	}



	// at this point, if possible, go and do some other computation


	
	// 7. The number of visible pixels is the number of sample rays which see the source
	//    object from the corresponding viewcell -> remember these values for later update
	//   of the viewcell pvs - or update immediately?

	queryIdx = 0;

	for (vit = beam.mViewCells.begin(); vit != vit_end; ++ vit)
	{
		// fetch queries
		unsigned int pixelCount = mOcclusionQueries[queryIdx ++]->GetQueryResult();

		if (pixelCount)
			Debug << "view cell " << (*vit)->GetId() << " visible pixels: " << pixelCount << endl;
	}
	

	// 8. Copmpute rendering statistics
	// In general it is not neccessary to remember to extract all the rays cast. I hope it
	// would be sufficient to gain only the intergral statistics about the new contributions
	// and so the rss tree would actually store no new rays (only the initial ones)
	// the subdivision of the tree would only be driven by the statistics (the glrender could
	// evaluate the contribution entropy for example)
	// However might be an option to extract/store only those the rays which made a contribution
	// (new viewcell has been discovered) or relative contribution greater than a threshold ... 

	ObjectContainer pvsObj;
	stat.pvsSize = ComputePvs(beam.mObjects, pvsObj);
	
	// to gain ray source and termination
	// copy contents of ray termination buffer into depth texture
	// and compare with ray source buffer
#if 0
	VssRayContainer rays;

	glBindTexture(GL_TEXTURE_2D, backDepthMap);	
	glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, depthMapSize, depthMapSize);

	ComputeRays(Intersectable *sourceObj, rays);

#endif



	//-- cleanup


	// reset gl state
	glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
	glDepthMask(GL_TRUE);
	glEnable(GL_CULL_FACE);
	glDisable(GL_STENCIL_TEST);
	cgGLDisableProfile(sCgFragmentProfile);
	glDisable(GL_TEXTURE_2D);

	// remove objects from beam
	if (beam.mFlags & !Beam::STORE_OBJECTS)
		beam.mObjects.clear();
}


void QtGlRendererBuffer::SetupProjectionForViewPoint(const Vector3 &viewPoint, 
												   const Beam &beam, 
												   Intersectable *sourceObject)
{
	float left, right, bottom, top, znear, zfar;

	beam.ComputePerspectiveFrustum(left, right, bottom, top, znear, zfar,
								   mSceneGraph->GetBox());

	//Debug << left << " " << right << " " << bottom << " " << top << " " << znear << " " << zfar << endl;
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glFrustum(left, right, bottom, top, znear, zfar);
	//glFrustum(-1, 1, -1, 1, 1, 20000);

    const Vector3 center = viewPoint + beam.GetMainDirection() * (zfar - znear) * 0.3f;
	const Vector3 up = 
		Normalize(CrossProd(beam.mPlanes[0].mNormal, beam.mPlanes[4].mNormal));

#ifdef _DEBUG
	Debug << "view point: " << viewPoint << endl;
	Debug << "eye: " << center << endl;
	Debug << "up: " << up << endl;
#endif

	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	gluLookAt(viewPoint.x, viewPoint.y, viewPoint.z, 
			  center.x, center.y, center.z,			  
			  up.x, up.y, up.z);
}		

  
void QtGlRendererBuffer::InitGL()
{
 makeCurrent(); 
 GlRenderer::InitGL();

#if 1
	// initialise dual depth buffer textures
	glGenTextures(1, &frontDepthMap);
	glBindTexture(GL_TEXTURE_2D, frontDepthMap);
	
	glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, depthMapSize, 
				 depthMapSize, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, NULL);

	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);

	glGenTextures(1, &backDepthMap);
	glBindTexture(GL_TEXTURE_2D, backDepthMap);
	
	glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, depthMapSize, 
		depthMapSize, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, NULL);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);

	// cg initialization
	cgSetErrorCallback(handleCgError);
	sCgContext = cgCreateContext();
	
	if (cgGLIsProfileSupported(CG_PROFILE_ARBFP1))
		sCgFragmentProfile = CG_PROFILE_ARBFP1;
	else 
	{
	  // try FP30
	  if (cgGLIsProfileSupported(CG_PROFILE_FP30))
            sCgFragmentProfile = CG_PROFILE_FP30;
	  else 
	  {
		  Debug << "Neither arbfp1 or fp30 fragment profiles supported on this system" << endl;
		  exit(1);
	  }
  }


 sCgFragmentProgram = cgCreateProgramFromFile(sCgContext,
											   CG_SOURCE, "../src/dual_depth.cg",
											   sCgFragmentProfile,
											   NULL, 
											   NULL);

  if (!cgIsProgramCompiled(sCgFragmentProgram))
	  cgCompileProgram(sCgFragmentProgram);

  cgGLLoadProgram(sCgFragmentProgram);
  cgGLBindProgram(sCgFragmentProgram);

  Debug << "---- PROGRAM BEGIN ----\n" <<
	  cgGetProgramString(sCgFragmentProgram, CG_COMPILED_PROGRAM) << "---- PROGRAM END ----\n";

#endif
  doneCurrent();
}


void QtGlRendererBuffer::ComputeRays(Intersectable *sourceObj, VssRayContainer &rays)
{
	for (int i = 0; i < depthMapSize * depthMapSize; ++ i)
	{
		//todo glGetTexImage()
	}
}



int QtGlRendererBuffer::ComputePvs(ObjectContainer &objects, 
								   ObjectContainer &pvs) const
{
	int pvsSize = 0;
	QImage image = toImage();
	Intersectable::NewMail();

	std::stable_sort(objects.begin(), objects.end(), ilt);

	MeshInstance dummy(NULL);

	Intersectable *obj = NULL;
			
	for (int x = 0; x < image.width(); ++ x)
	{
		for (int y = 0; y < image.height(); ++ y)
		{
			QRgb pix = image.pixel(x, y);
			const int id = GetId(qRed(pix), qGreen(pix), qBlue(pix));

			dummy.SetId(id);

			ObjectContainer::iterator oit =
				lower_bound(objects.begin(), objects.end(), &dummy, ilt);
			
			
			if (//(oit != oit.end()) && 
				((*oit)->GetId() == id) && 
				!obj->Mailed())
			{
				obj = *oit;
				obj->Mail();
				++ pvsSize;
				pvs.push_back(obj);
			}
		}
	}

	return pvsSize;
}



void
QtGlRendererWidget::SetupCameraProjection(const int w, const int h, const float angle)
{
  if (!mTopView) {
	int ww = w*CAMERA_VIEW_WIDTH;
	int hh = h;
	glViewport(0, 0, ww, hh);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(angle, ww/(float)hh, 0.1, 2.0*Magnitude(mSceneGraph->GetBox().Diagonal()));
	glMatrixMode(GL_MODELVIEW);
  } else {
	int ww = w*CAMERA_VIEW_WIDTH;
	int hh = h;
	glViewport(0, 0, ww, hh);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(50.0, ww/(float)hh, 0.1, 20.0*Magnitude(mSceneGraph->GetBox().Diagonal()));
	glMatrixMode(GL_MODELVIEW);
  }
}

void
QtGlRendererWidget::SetupManipulatorProjection(const int w, const int h, const float angle)
{
  int ww = w*(1.0f - CAMERA_VIEW_WIDTH);
  int hh = h;
  glViewport(w - ww, 0, ww, hh);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluPerspective(angle, ww/(float)hh, 0.1f, 1000.0f);
  glMatrixMode(GL_MODELVIEW);
}

void
QtGlRendererWidget::RenderPvs()
{
  
  Intersectable::NewMail();

  ViewCell *viewcell = NULL;

  PrVs prvs;
  
  if (!mUseFilter) {
	viewcell = mViewCellsManager->GetViewCell(mViewPoint, true);
  } else {
	//  mViewCellsManager->SetMaxFilterSize(1);
	mViewCellsManager->GetPrVS(mViewPoint, prvs, mViewCellsManager->GetFilterWidth());
	viewcell = prvs.mViewCell;
  }
  
  if (viewcell) {
	// copy the pvs so that it can be filtered...
	ObjectPvs pvs = viewcell->GetPvs();

	if (mUseSpatialFilter) {
	  mViewCellsManager->ApplySpatialFilter(mKdTree,
											mSpatialFilterSize*
											Magnitude(mViewCellsManager->GetViewSpaceBox().Size()),
											pvs);
	}
	
	
	ObjectPvsMap::const_iterator it = pvs.mEntries.begin();
	
	mPvsSize = pvs.mEntries.size();
	  
	for (; it != pvs.mEntries.end(); ++ it) {
	  Intersectable *object = (*it).first;
	  
	  if (mRenderVisibilityEstimates) {
		float visibility = mTransferFunction*log10((*it).second.mSumPdf + 1); // /5.0f
		glColor3f(visibility, 0.0f, 0.0f);
		mUseForcedColors = true;
		RenderIntersectable(object);
		mUseForcedColors = false;
	  } else {
		mUseForcedColors = false;
		RenderIntersectable(object);
	  }
	}

	if (mRenderFilter) {
	  mWireFrame = true;
	  RenderIntersectable(viewcell);
	  glPushMatrix();
	  glTranslatef(mViewPoint.x, mViewPoint.y, mViewPoint.z);
	  glScalef(5.0f,5.0f,5.0f);
	  glPushAttrib(GL_CURRENT_BIT);
	  glColor3f(1.0f, 0.0f, 0.0f);
	  gluSphere((::GLUquadric *)mSphere,
				1e-3*Magnitude(mViewCellsManager->GetViewSpaceBox().Size()), 6, 6);
	  glPopAttrib();
	  glPopMatrix();
	  mWireFrame = false;
	}
	
	if (mUseFilter)
	  mViewCellsManager->DeleteLocalMergeTree(viewcell);
  } else {
	ObjectContainer::const_iterator oi = mObjects.begin();
	for (; oi != mObjects.end(); oi++)
	  RenderIntersectable(*oi);
  }
}

float
QtGlRendererWidget::RenderErrors()
{
  float pErrorPixels = -1.0f;

  glReadBuffer(GL_BACK);
  
  mUseFalseColors = true;

  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  
  double eq[4];
  eq[0] = mSceneCutPlane.mNormal.x;
  eq[1] = mSceneCutPlane.mNormal.y;
  eq[2] = mSceneCutPlane.mNormal.z;
  eq[3] = mSceneCutPlane.mD;
  
  if (mCutScene) {
	glClipPlane(GL_CLIP_PLANE0, eq);
    glEnable(GL_CLIP_PLANE0);
  }
  
  if (mDetectEmptyViewSpace) 
	glEnable( GL_CULL_FACE );
  else
	glDisable( GL_CULL_FACE );

  ObjectContainer::const_iterator oi = mObjects.begin();
  for (; oi != mObjects.end(); oi++)
	RenderIntersectable(*oi);

  ViewCell *viewcell = NULL;

  QImage im1, im2;
  QImage diff;
  
  if (viewcell) {
	// read back the texture
	im1 = grabFrameBuffer(true);
	
	RenderPvs();

	// read back the texture
	im2 = grabFrameBuffer(true);
	
	diff = im1;
	int x, y;
	int errorPixels = 0;
	
	for (y = 0; y < im1.height(); y++)
	  for (x = 0; x < im1.width(); x++)
		if (im1.pixel(x, y) == im2.pixel(x, y))
		  diff.setPixel(x, y, qRgba(0,0,0,0));
		else {
		  diff.setPixel(x, y, qRgba(255,128,128,255));
		  errorPixels++;
		}
	pErrorPixels = ((float)errorPixels)/(im1.height()*im1.width());
  }

  // now render the pvs again
  SetupCamera();
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  mUseFalseColors = false;
  
  oi = mObjects.begin();
  for (; oi != mObjects.end(); oi++)
	RenderIntersectable(*oi);

  // now render im1
  if (viewcell) {
	if (0 && mTopView) {
	  mWireFrame = true;
	  RenderIntersectable(viewcell);
	  mWireFrame = false;
	}
	
	// init ortographic projection
	glMatrixMode(GL_PROJECTION);
	glPushMatrix();
	
	glLoadIdentity();
	gluOrtho2D(0, 1.0f, 0, 1.0f);
	
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	
	bindTexture(diff);
	
	glPushAttrib(GL_ENABLE_BIT);
	glEnable( GL_ALPHA_TEST );
	glDisable( GL_CULL_FACE );
	glAlphaFunc( GL_GREATER, 0.5 );
	
	glEnable( GL_TEXTURE_2D );
	glBegin(GL_QUADS);
	
	glTexCoord2f(0,0);
	glVertex3f(0,0,0);
	
	glTexCoord2f(1,0);
	glVertex3f( 1, 0, 0);
	
	glTexCoord2f(1,1);
	glVertex3f( 1, 1, 0);
	
	glTexCoord2f(0,1);
	glVertex3f(0, 1, 0);
	glEnd();
	
	glPopAttrib();
	
	// restore the projection matrix
	glMatrixMode(GL_PROJECTION);
	glPopMatrix();
	glMatrixMode(GL_MODELVIEW);
  }

  glDisable(GL_CLIP_PLANE0);
  
  mRenderError = pErrorPixels;
  return pErrorPixels;
}


void
QtGlRendererWidget::mousePressEvent(QMouseEvent *e)
{
  int x = e->pos().x();
  int y = e->pos().y();

  mousePoint.x = x;
  mousePoint.y = y;
  
}

void
QtGlRendererWidget::mouseMoveEvent(QMouseEvent *e)
{
  float MOVE_SENSITIVITY = Magnitude(mSceneGraph->GetBox().Diagonal())*1e-3;
  float TURN_SENSITIVITY=0.1f;
  float TILT_SENSITIVITY=32.0 ;
  float TURN_ANGLE= M_PI/36.0 ;

  int x = e->pos().x();
  int y = e->pos().y();

  int diffx = -(mousePoint.x - x);
  int diffy = -(mousePoint.y - y);
  
  if (x < width()*CAMERA_VIEW_WIDTH) {
	if (e->modifiers() & Qt::ControlModifier) {
	  mViewPoint.y += (y-mousePoint.y)*MOVE_SENSITIVITY/2.0;
	  mViewPoint.x += (x-mousePoint.x)*MOVE_SENSITIVITY/2.0;
	} else {
	  mViewPoint += mViewDirection*((mousePoint.y - y)*MOVE_SENSITIVITY);
	  float adiff = TURN_ANGLE*(x - mousePoint.x)*-TURN_SENSITIVITY;
	  float angle = atan2(mViewDirection.x, mViewDirection.z);
	  mViewDirection.x = sin(angle+adiff);
	  mViewDirection.z = cos(angle+adiff);
	}
  } else {
	float W = width()*(1.0f-CAMERA_VIEW_WIDTH);
	float H = height();
	int xx = x - width()*CAMERA_VIEW_WIDTH;
	int mxx = mousePoint.x - width()*CAMERA_VIEW_WIDTH;
    if (e->modifiers() & Qt::ControlModifier) {
	  mManipulatorScale = mManipulatorScale * (1.0 + (((float) (-diffy)) / H));
	} else {
	  float quat[4];
	  trackball(quat,
				(2.0 * mxx - W) / W,
				(H - 2.0 * mousePoint.y) / H,
				(2.0 * xx - W) / W,
				(H - 2.0 * y) / H
				);
	  add_quats(quat, mManipulatorLastQuat, mManipulatorLastQuat);
	}
  }
  
  mousePoint.x = x;
  mousePoint.y = y;
  
  updateGL();
}

void
QtGlRendererWidget::mouseReleaseEvent(QMouseEvent *)
{


}

void
QtGlRendererWidget::resizeGL(int w, int h)
{
  SetupCameraProjection(w, h);
  updateGL();
}

void
QtGlRendererWidget::paintGL()
{
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  if (1) {
	SetupCameraProjection(width(), height());
	SetupCamera();
	
	if (mRenderErrors) {
	  RenderErrors();
	} else {
	  RenderPvs();
	}
	
  }

  mFrame++;

  if (1) {
	// render into the right side of the window buffer
	SetupManipulatorProjection(width(), height());
	SetupManipulator();
	
	
	if (mRenderViewCells) 
	  RenderViewCells();
	
	RenderPvs();
	
	if (0) {
	  mWireFrame = true;
	  RenderScene();
	  mWireFrame = false;
	}
	
	if (mShowRays) {
	  RssPreprocessor *p = (RssPreprocessor *)mViewCellsManager->GetPreprocessor();
	  if (p->mRssTree) {
		VssRayContainer rays;
		p->mRssTree->CollectRays(rays, 10000);
		RenderRays(rays);
	  }
	}

	if (mShowRenderCost) 
	  RenderRenderCost();

	RenderInfo();
  }
  mFrame++;
  
}


void
QtGlRendererWidget::SetupCamera()
{
  if (!mTopView)
	GlRenderer::SetupCamera();
  else {
	if (0) {
	  float dist = Magnitude(mSceneGraph->GetBox().Diagonal())*0.05;
	  Vector3 pos = mViewPoint - dist*Vector3(mViewDirection.x,
											  -1,
											  mViewDirection.y);
	  
	  Vector3 target = mViewPoint + dist*mViewDirection;
	  Vector3 up(0,1,0);
	  
	  glLoadIdentity();
	  gluLookAt(pos.x, pos.y, pos.z,
				target.x, target.y, target.z,
				up.x, up.y, up.z);
	} else {
	  float dist = Magnitude(mSceneGraph->GetBox().Diagonal())*mTopDistance;
	  Vector3 pos = mViewPoint  + dist*Vector3(0,
											   1,
											   0);
	  
	  Vector3 target = mViewPoint;
	  Vector3 up(mViewDirection.x, 0, mViewDirection.z);
	  
	  glLoadIdentity();
	  gluLookAt(pos.x, pos.y, pos.z,
				target.x, target.y, target.z,
				up.x, up.y, up.z);
	  
	}
  }

}

void
QtGlRendererWidget::SetupManipulator()
{
  float m[4][4];

  glLoadIdentity();
  gluLookAt(0.0, 0.0, 30.0,  /* eye is at (0,0,30) */
			0.0, 0.0, 0.0,      /* center is at (0,0,0) */
			0.0, 1.0, 0.);      /* up is in positive Y direction */
  
  build_rotmatrix(m, mManipulatorLastQuat);
  glMultMatrixf(&m[0][0]);
  
  float scale = mManipulatorScale*20.0f/Magnitude(mSceneGraph->GetBox().Diagonal());
  glScalef(scale, scale, scale);
  
  Vector3 t = -mSceneGraph->GetBox().Center();
  glTranslatef(t.x, t.y, t.z);
  
}

void
QtGlRendererWidget::keyPressEvent ( QKeyEvent * e )
{
  switch (e->key()) {
  case Qt::Key_T:
	mTopView = !mTopView;
	SetupCameraProjection(width(), height());
	updateGL();
	break;
  case Qt::Key_V:
	mRenderViewCells = !mRenderViewCells;
	updateGL();
	break;
  case Qt::Key_P:
	// set random viewpoint
	mViewCellsManager->GetViewPoint(mViewPoint);
	updateGL();
	break;

  default:
	e->ignore();
	break;
  }
}

  

QtGlRendererWidget::QtGlRendererWidget(
									   SceneGraph *sceneGraph,
									   ViewCellsManager *viewcells,
									   KdTree *tree,
									   QWidget * parent,
									   const QGLWidget * shareWidget,
									   Qt::WFlags f
									   )
  :
  GlRendererWidget(sceneGraph, viewcells, tree), QGLWidget(parent, shareWidget, f)
{
  mPreprocessorThread = NULL;
  mTopView = false;
  mRenderViewCells = false;
  mTopDistance = 1.0f;
  mCutViewCells = false;
  mCutScene = false;
  mRenderErrors = false;
  mRenderBoxes = false;
  mRenderFilter = true;
  mRenderVisibilityEstimates = false;
  mTransferFunction = 0.2f;
  mManipulatorScale = 1.0f;
  trackball(mManipulatorLastQuat, 0.0f, 0.0f, 0.0f, 0.0f);
  bool tmp;

  Environment::GetSingleton()->GetBoolValue("Preprocessor.applyVisibilityFilter", tmp );
  mUseFilter = tmp;
  
  Environment::GetSingleton()->GetBoolValue("Preprocessor.applyVisibilitySpatialFilter",
							tmp );
  mUseSpatialFilter = tmp;

  mShowRenderCost = false;
  mShowPvsSizes = false;
  mSpatialFilterSize = 0.01;
  mPvsSize = 0;
  mRenderError = 0.0f;
  mShowRays = false;
  
  mControlWidget = new QtRendererControlWidget(NULL);
  
  connect(mControlWidget, SIGNAL(SetViewCellGranularity(int)), this, SLOT(SetViewCellGranularity(int)));
  connect(mControlWidget,
		  SIGNAL(SetTransferFunction(int)),
		  this,
		  SLOT(SetTransferFunction(int)));
  connect(mControlWidget, SIGNAL(UpdateAllPvs()), this, SLOT(UpdateAllPvs()));
  connect(mControlWidget, SIGNAL(ComputeVisibility()), this, SLOT(ComputeVisibility()));
  connect(mControlWidget, SIGNAL(StopComputation()), this, SLOT(StopComputation()));

  connect(mControlWidget, SIGNAL(SetSceneCut(int)), this, SLOT(SetSceneCut(int)));
  connect(mControlWidget, SIGNAL(SetTopDistance(int)), this, SLOT(SetTopDistance(int)));

  connect(mControlWidget, SIGNAL(SetVisibilityFilterSize(int)), this, SLOT(SetVisibilityFilterSize(int)));
  connect(mControlWidget, SIGNAL(SetSpatialFilterSize(int)), this, SLOT(SetSpatialFilterSize(int)));

  connect(mControlWidget, SIGNAL(SetShowViewCells(bool)), this, SLOT(SetShowViewCells(bool)));
  connect(mControlWidget, SIGNAL(SetShowRenderCost(bool)), this, SLOT(SetShowRenderCost(bool)));
  connect(mControlWidget, SIGNAL(SetShowPvsSizes(bool)), this, SLOT(SetShowPvsSizes(bool)));
  connect(mControlWidget, SIGNAL(SetTopView(bool)), this, SLOT(SetTopView(bool)));
  connect(mControlWidget, SIGNAL(SetCutViewCells(bool)), this, SLOT(SetCutViewCells(bool)));
  connect(mControlWidget, SIGNAL(SetCutScene(bool)), this, SLOT(SetCutScene(bool)));
  connect(mControlWidget, SIGNAL(SetRenderErrors(bool)), this, SLOT(SetRenderErrors(bool)));
  connect(mControlWidget, SIGNAL(SetRenderBoxes(bool)), this, SLOT(SetRenderBoxes(bool)));
  connect(mControlWidget, SIGNAL(SetRenderFilter(bool)), this, SLOT(SetRenderFilter(bool)));
  connect(mControlWidget, SIGNAL(SetRenderVisibilityEstimates(bool)),
		  this, SLOT(SetRenderVisibilityEstimates(bool)));
  connect(mControlWidget, SIGNAL(SetUseFilter(bool)), this, SLOT(SetUseFilter(bool)));
  connect(mControlWidget, SIGNAL(SetUseSpatialFilter(bool)),
		  this, SLOT(SetUseSpatialFilter(bool)));

  connect(mControlWidget,
		  SIGNAL(SetShowRays(bool)),
		  this,
		  SLOT(SetShowRays(bool)));

  resize(1000, 500);
  mControlWidget->show();
}

void
QtGlRendererWidget::UpdateAllPvs()
{
  // $$ does not work so far:(
  mViewCellsManager->UpdatePvsForEvaluation();
  //	mViewCellsManager->FinalizeViewCells(false);
}

void
QtGlRendererWidget::ComputeVisibility()
{
  cerr<<"Compute Visibility called!\n"<<endl;
  if (!mPreprocessorThread->isRunning())
	mPreprocessorThread->RunThread();
}

void
QtGlRendererWidget::StopComputation()
{
  cerr<<"stop computation called!\n"<<endl;
  mViewCellsManager->GetPreprocessor()->mStopComputation = true;
}

void
QtGlRendererWidget::RenderRenderCost()
{
	static vector<float> costFunction;
	static float maxCost = -1;
	if (costFunction.size()==0) {
	  ViewCellsTree *tree = mViewCellsManager->GetViewCellsTree();
	  if (tree) {
		tree->GetCostFunction(costFunction);
		maxCost = -1;
		for (int i=0;  i < costFunction.size(); i++) {
		  //		  cout<<i<<":"<<costFunction[i]<<" ";
		  // update cost function to an absolute value based on the total geometry count
		  costFunction[i]*=mSceneGraph->GetRoot()->mGeometry.size();
		  if (costFunction[i] > maxCost)
			maxCost = costFunction[i];
		}
	  }
	}

	
	int currentPos = (int)mViewCellsManager->GetViewCells().size();
	float currentCost= -1;

	if (currentPos < costFunction.size())
	  currentCost = costFunction[currentPos];
#if 1	
	cout<<"costFunction.size()="<<costFunction.size()<<endl;
	cout<<"CP="<<currentPos<<endl;
	cout<<"MC="<<maxCost<<endl;
	cout<<"CC="<<currentCost<<endl;
#endif
	if (costFunction.size()) {
	  float scaley = 1.0f/log10(maxCost);
	  float scalex = 1.0f/(float)costFunction.size();

	  glDisable(GL_DEPTH_TEST);
	  // init ortographic projection
	  glMatrixMode(GL_PROJECTION);
	  
	  glPushMatrix();
	  
	  glLoadIdentity();
	  gluOrtho2D(0, 1.0f, 0, 1.0f);
	  
	  glTranslatef(0.1f, 0.1f, 0.0f);
	  glScalef(0.8f, 0.8f, 1.0f);
	  glMatrixMode(GL_MODELVIEW);
	  glLoadIdentity();
	  
	  glColor3f(1.0f,0,0);
	  glBegin(GL_LINE_STRIP);
	  //	  glVertex3f(0,0,0);
	  
	  for (int i=0;  i < costFunction.size(); i++) {
		float x =  i*scalex;
		float y = log10(costFunction[i])*scaley;
		glVertex3f(x,y,0.0f);
	  }
	  glEnd();
	  
	  glColor3f(1.0f,0,0);
	  glBegin(GL_LINES);
	  float x =  currentPos*scalex;
	  glVertex3f(x,0.0,0.0f);
	  glVertex3f(x,1.0f,0.0f);
	  glEnd();
	  
	  glColor3f(0.0f,0,0);
	  // show a grid
	  glBegin(GL_LINE_LOOP);
	  glVertex3f(0,0,0.0f);
	  glVertex3f(1,0,0.0f);
	  glVertex3f(1,1,0.0f);
	  glVertex3f(0,1,0.0f);
	  glEnd();

	  glBegin(GL_LINES);
	  for (int i=0;  i < costFunction.size(); i += 1000) {
		float x =  i*scalex;
		glVertex3f(x,0.0,0.0f);
		glVertex3f(x,1.0f,0.0f);
	  }

	  for (int i=0;  pow(10, i) < maxCost; i+=1) {
		float y = i*scaley;
		//		QString s;
		//		s.sprintf("%d", (int)pow(10,i));
		//		renderText(width()/2+5, y*height(), s);
		glVertex3f(0.0f, y, 0.0f);
		glVertex3f(1.0f, y, 0.0f);
	  }

	  glEnd();

	  
	  // restore the projection matrix
	  glMatrixMode(GL_PROJECTION);
	  glPopMatrix();
	  glMatrixMode(GL_MODELVIEW);
	  glEnable(GL_DEPTH_TEST);

	}
  


}

void
QtGlRendererWidget::RenderInfo()
{

  // $$JB temporal hack for two windows separation
  if (1) {

	// model view 
	glPushMatrix();
	glLoadIdentity();
	
	// init ortographic projection
	glMatrixMode(GL_PROJECTION);
	glPushMatrix();
	
	glLoadIdentity();
	gluOrtho2D(0, 1.0f, 0, 1.0f);
	
	float w = 0.01f;
	float h = 1.0f;
	float px = 0.0f;
	float py = 0.0f;
	
	glColor3f(0.8f, 0.8f, 0.8f);
	glBegin(GL_QUADS);
	
	glVertex3f(px+w, py, 0);
	glVertex3f(px+w, py+h + w, 0);
	glVertex3f(px, py+h, 0);
	glVertex3f(px, py, 0);
	glEnd();
	
	// projection
	glPopMatrix();
	
	glMatrixMode(GL_MODELVIEW);
	// model view
	glPopMatrix();
  }


  QString s;
  int vc = 0;
  if (mViewCellsManager)
	vc = mViewCellsManager->GetViewCells().size();
  int filter = 0;
  if (mViewCellsManager)
	filter = mViewCellsManager->GetMaxFilterSize();

  glColor3f(1.0f,1.0f,1.0f);

  s.sprintf("frame:%04d viewpoint:(%4.1f,%4.1f,%4.1f) dir:(%4.1f,%4.1f,%4.1f)",
			mFrame,
			mViewPoint.x,
			mViewPoint.y,
			mViewPoint.z,
			mViewDirection.x,
			mViewDirection.y,
			mViewDirection.z
			);

  renderText(20,20,s);

  s.sprintf("viewcells:%04d filter:%04d pvs:%04d error:%5.5f\%",
			vc,
			filter,
			mPvsSize,
			mRenderError*100.0f);


  renderText(20,40,s);

  

  
}


void
QtGlRendererWidget::SetViewCellGranularity(int number)
{
  if (mViewCellsManager) {
	//  	mViewCellsManager->SetMaxFilterSize(number);
    mViewCellsManager->CollectViewCells(number);

	// $$ does not work so far:(
	//	mViewCellsManager->UpdatePvsForEvaluation();
	//	mViewCellsManager->FinalizeViewCells(false);
  }
  updateGL();
}

void
QtGlRendererWidget::SetVisibilityFilterSize(int number)
{
  if (mViewCellsManager) 
  	mViewCellsManager->SetMaxFilterSize(number);
  updateGL();
}

void
QtGlRendererWidget::SetSpatialFilterSize(int number)
{
  mSpatialFilterSize = 1e-3*number;
  updateGL();
}

void
QtGlRendererWidget::SetSceneCut(int number)
{
  // assume the cut plane can only be aligned with xz plane
  // shift it along y according to number, which is percentage of the bounding
  // box position
  if (mViewCellsManager) {
	AxisAlignedBox3 box = mViewCellsManager->GetViewSpaceBox();
	Vector3 p = box.Min() + (number/1000.0f)*box.Max();
	mSceneCutPlane.mNormal = Vector3(0,-1,0);
	mSceneCutPlane.mD = -DotProd(mSceneCutPlane.mNormal, p);
	updateGL();
  }
}

void
QtGlRendererWidget::SetTopDistance(int number)
{
  mTopDistance = number/1000.0f;
  updateGL();
}

void
QtGlRendererWidget::RenderViewCells()
{
  mUseFalseColors = true;

  glPushAttrib(GL_CURRENT_BIT | GL_ENABLE_BIT | GL_POLYGON_BIT);
  
  glEnable(GL_CULL_FACE);
  //glDisable(GL_CULL_FACE);
  glCullFace(GL_FRONT);
  double eq[4];
  eq[0] = mSceneCutPlane.mNormal.x;
  eq[1] = mSceneCutPlane.mNormal.y;
  eq[2] = mSceneCutPlane.mNormal.z;
  eq[3] = mSceneCutPlane.mD;

  if (mCutViewCells) {
	glClipPlane(GL_CLIP_PLANE0, eq);
	glEnable(GL_CLIP_PLANE0);
  }
  
  int i;
  ViewCellContainer &viewcells = mViewCellsManager->GetViewCells();
  int maxPvs = -1;
  for (i=0; i < viewcells.size(); i++) 
  {
	ViewCell *vc = viewcells[i];

	//const int p = vc->GetPvs().CountObjectsInPvs();
	const int p = vc->GetPvs().Size();
	if (p > maxPvs)
	  maxPvs = p;
  }


  for (i=0; i < viewcells.size(); i++) {
	ViewCell *vc = viewcells[i];
	//	Mesh *m = vc->GetMesh();


	RgbColor c;

	if (!mShowPvsSizes) {
	  mWireFrame = true;
	  c = vc->GetColor();
	} else {
	  //	  const float importance = 5.0f*mTransferFunction * ((float)vc->GetPvs().CountObjectsInPvs() / (float)maxPvs);
	  const float importance = 5.0f*mTransferFunction * ((float)vc->GetPvs().Size() / (float)maxPvs);
	  c = RgbColor(importance, 1.0f - importance, 0.0f);
	}
	glColor3f(c.r, c.g, c.b);
	
	RenderViewCell(vc);
  }

  mUseFalseColors = false;
  mWireFrame = false;

  glPopAttrib();
  
}





/***********************************************************************/
/*                     QtGlDebuggerWidget implementation				   */
/***********************************************************************/


QtGlDebuggerWidget::QtGlDebuggerWidget(QtGlRendererBuffer *buf, QWidget *parent)
      : QGLWidget(QGLFormat(QGL::SampleBuffers), parent), mRenderBuffer(buf)
{
	// create the pbuffer
    //pbuffer = new QGLPixelBuffer(QSize(512, 512), format(), this);
    timerId = startTimer(20);
    setWindowTitle(("OpenGL pbuffers"));
}


QtGlDebuggerWidget::~QtGlDebuggerWidget()
{
 mRenderBuffer->releaseFromDynamicTexture();
   glDeleteTextures(1, &dynamicTexture);
	 
	 DEL_PTR(mRenderBuffer);
}



QtRendererControlWidget::QtRendererControlWidget(QWidget * parent, Qt::WFlags f):
  QWidget(parent, f)
{

  QVBoxLayout *vl = new QVBoxLayout;
  setLayout(vl);
  
  QWidget *vbox = new QGroupBox("ViewCells", this);
  layout()->addWidget(vbox);
  
  vl = new QVBoxLayout;
  vbox->setLayout(vl);

  QLabel *label = new QLabel("Granularity");
  vbox->layout()->addWidget(label);
  
  QSlider *slider = new QSlider(Qt::Horizontal, vbox);
  vl->addWidget(slider);
  slider->show();
  slider->setRange(1, 10000);
  slider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
  slider->setValue(200);

  
  connect(slider, SIGNAL(valueChanged(int)), SIGNAL(SetViewCellGranularity(int)));

  label = new QLabel("Transfer function");
  vbox->layout()->addWidget(label);
  
  slider = new QSlider(Qt::Horizontal, vbox);
  vl->addWidget(slider);
  slider->show();
  slider->setRange(1, 1000);
  slider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
  slider->setValue(100);

  
  connect(slider, SIGNAL(valueChanged(int)), SIGNAL(SetTransferFunction(int)));

  {
	QPushButton *button = new QPushButton("Update all PVSs", vbox);
	vbox->layout()->addWidget(button);
	connect(button, SIGNAL(clicked()), SLOT(UpdateAllPvs()));
  }
  
  
  label = new QLabel("Filter size");
  vbox->layout()->addWidget(label);
  
  slider = new QSlider(Qt::Horizontal, vbox);
  vbox->layout()->addWidget(slider);
  slider->show();
  slider->setRange(1, 100);
  slider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
  slider->setValue(3);
  
  connect(slider, SIGNAL(valueChanged(int)), SIGNAL(SetVisibilityFilterSize(int)));


  label = new QLabel("Spatial Filter size");
  vbox->layout()->addWidget(label);
  
  slider = new QSlider(Qt::Horizontal, vbox);
  vbox->layout()->addWidget(slider);
  slider->show();
  slider->setRange(1, 100);
  slider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
  slider->setValue(10);
  
  connect(slider, SIGNAL(valueChanged(int)), SIGNAL(SetSpatialFilterSize(int)));



  QWidget *hbox = new QWidget(vbox);
  vl->addWidget(hbox);
  QHBoxLayout *hlayout = new QHBoxLayout;
  hbox->setLayout(hlayout);
  
  QCheckBox *cb = new QCheckBox("Show viewcells", hbox);
  hlayout->addWidget(cb);
  cb->setChecked(false);
  connect(cb, SIGNAL(toggled(bool)), SIGNAL(SetShowViewCells(bool)));

  cb = new QCheckBox("Render cost curve", hbox);
  hlayout->addWidget(cb);
  cb->setChecked(false);
  connect(cb, SIGNAL(toggled(bool)), SIGNAL(SetShowRenderCost(bool)));

  cb = new QCheckBox("Show render cost", hbox);
  hlayout->addWidget(cb);
  cb->setChecked(false);
  connect(cb, SIGNAL(toggled(bool)), SIGNAL(SetShowPvsSizes(bool)));

  cb = new QCheckBox("Show rays", hbox);
  hlayout->addWidget(cb);
  cb->setChecked(false);
  connect(cb, SIGNAL(toggled(bool)), SIGNAL(SetShowRays(bool)));

  vbox->resize(800,100);

  
  vbox = new QGroupBox("Rendering", this);
  layout()->addWidget(vbox);
  
  vl = new QVBoxLayout;
  vbox->setLayout(vl);



  cb = new QCheckBox("Cut view cells", vbox);
  vbox->layout()->addWidget(cb);
  cb->setChecked(false);
  connect(cb, SIGNAL(toggled(bool)), SIGNAL(SetCutViewCells(bool)));


  slider = new QSlider(Qt::Horizontal, vbox);
  vbox->layout()->addWidget(slider);
  slider->show();
  slider->setRange(0, 1000);
  slider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
  slider->setValue(1000);

  connect(slider, SIGNAL(valueChanged(int)), SIGNAL(SetSceneCut(int)));


  cb = new QCheckBox("Cut scene", vbox);
  vbox->layout()->addWidget(cb);
  cb->setChecked(false);
  connect(cb, SIGNAL(toggled(bool)), SIGNAL(SetCutScene(bool)));

  cb = new QCheckBox("Render boxes", vbox);
  vbox->layout()->addWidget(cb);
  cb->setChecked(false);
  connect(cb, SIGNAL(toggled(bool)), SIGNAL(SetRenderBoxes(bool)));

  cb = new QCheckBox("Render visibility estimates", vbox);
  vbox->layout()->addWidget(cb);
  cb->setChecked(false);
  connect(cb, SIGNAL(toggled(bool)), SIGNAL(SetRenderVisibilityEstimates(bool)));

  
  cb = new QCheckBox("Render errors", vbox);
  vbox->layout()->addWidget(cb);
  cb->setChecked(false);
  connect(cb, SIGNAL(toggled(bool)), SIGNAL(SetRenderErrors(bool)));

  
  bool tmp;

  cb = new QCheckBox("Use filter", vbox);
  vbox->layout()->addWidget(cb);
  Environment::GetSingleton()->GetBoolValue("Preprocessor.applyVisibilityFilter", tmp );
  cb->setChecked(tmp);
  connect(cb, SIGNAL(toggled(bool)), SIGNAL(SetUseFilter(bool)));

  
  cb = new QCheckBox("Use spatial filter", vbox);
  vbox->layout()->addWidget(cb);
  Environment::GetSingleton()->GetBoolValue("Preprocessor.applyVisibilitySpatialFilter",
											tmp );
  cb->setChecked(tmp);
  connect(cb, SIGNAL(toggled(bool)), SIGNAL(SetUseSpatialFilter(bool)));

  cb = new QCheckBox("Render filter", vbox);
  vbox->layout()->addWidget(cb);
  cb->setChecked(true);
  connect(cb, SIGNAL(toggled(bool)), SIGNAL(SetRenderFilter(bool)));



  
  slider = new QSlider(Qt::Horizontal, vbox);
  vbox->layout()->addWidget(slider);
  slider->show();
  slider->setRange(1, 1000);
  slider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
  slider->setValue(500);
  
  connect(slider, SIGNAL(valueChanged(int)), SIGNAL(SetTopDistance(int)));
  
  cb = new QCheckBox("Top View", vbox);
  vbox->layout()->addWidget(cb);
  cb->setChecked(false);
  connect(cb, SIGNAL(toggled(bool)), SIGNAL(SetTopView(bool)));



  vbox = new QGroupBox("PVS Errors", this);
  layout()->addWidget(vbox);
  
  vl = new QVBoxLayout;
  vbox->setLayout(vl);

  QPushButton *button = new QPushButton("Compute Visibility", vbox);
  vbox->layout()->addWidget(button);
  connect(button, SIGNAL(clicked()), SLOT(ComputeVisibility()));

  button = new QPushButton("Stop Computation", vbox);
  vbox->layout()->addWidget(button);
  connect(button, SIGNAL(clicked()), SLOT(StopComputation()));


  if (0) {
	vbox = new QGroupBox("PVS Errors", this);
	layout()->addWidget(vbox);
	
	vl = new QVBoxLayout;
	vbox->setLayout(vl);
	
	mPvsErrorWidget = new QListWidget(vbox);
	vbox->layout()->addWidget(mPvsErrorWidget);
	
	connect(mPvsErrorWidget,
			SIGNAL(doubleClicked(const QModelIndex &)),
			this,
			SLOT(PvsErrorClicked(const QModelIndex &)));
	
	QPushButton *button = new QPushButton("Next Error Frame", vbox);
	vbox->layout()->addWidget(button);
	connect(button, SIGNAL(clicked(void)), SLOT(FocusNextPvsErrorFrame(void)));
  }
  
  setWindowTitle("Preprocessor Control Widget");
  adjustSize();
}




void
QtRendererControlWidget::FocusNextPvsErrorFrame(void)
{
  
  
}

void
QtRendererControlWidget::UpdatePvsErrorItem(int row,
										  GlRendererBuffer::PvsErrorEntry &pvsErrorEntry)
{

  QListWidgetItem *i = mPvsErrorWidget->item(row);
  QString s;
  s.sprintf("%5.5f", pvsErrorEntry.mError);
  if (i) {
	i->setText(s);
  } else {
	new QListWidgetItem(s, mPvsErrorWidget);
  }
  mPvsErrorWidget->update();
}


void QtGlDebuggerWidget::initializeGL()
{
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();

	glFrustum(-1, 1, -1, 1, 10, 100);
	glTranslatef(-0.5f, -0.5f, -0.5f);
	glTranslatef(0.0f, 0.0f, -15.0f);
	glMatrixMode(GL_MODELVIEW);

	glEnable(GL_CULL_FACE);
	initCommon();
	initPbuffer();

}


void QtGlDebuggerWidget::resizeGL(int w, int h)
{
	glViewport(0, 0, w, h);
}


void QtGlDebuggerWidget::paintGL()
{
	// draw a spinning cube into the pbuffer..
	mRenderBuffer->makeCurrent();
	
	BeamSampleStatistics stats;
	mRenderBuffer->SampleBeamContributions(mSourceObject, mBeam, mSamples, stats);

	glFlush();

	// rendering directly to a texture is not supported on X11, unfortunately
    mRenderBuffer->updateDynamicTexture(dynamicTexture);
   
    // and use the pbuffer contents as a texture when rendering the
    // background and the bouncing cubes
    makeCurrent();
    glBindTexture(GL_TEXTURE_2D, dynamicTexture);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    // draw the background
    glMatrixMode(GL_MODELVIEW);
    glPushMatrix();
    glLoadIdentity();
    glMatrixMode(GL_PROJECTION);
    glPushMatrix();
    glLoadIdentity();

  	glPopMatrix();
	glMatrixMode(GL_MODELVIEW);
	glPopMatrix();
}


void QtGlDebuggerWidget::initPbuffer()
{
	// set up the pbuffer context
    mRenderBuffer->makeCurrent();
	/*mRenderBuffer->InitGL();

	glViewport(0, 0, mRenderBuffer->size().width(), mRenderBuffer->size().height());
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(-1, 1, -1, 1, -99, 99);
	glTranslatef(-0.5f, -0.5f, 0.0f);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();

	glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);*/
	
	// generate a texture that has the same size/format as the pbuffer
    dynamicTexture = mRenderBuffer->generateDynamicTexture();

	// bind the dynamic texture to the pbuffer - this is a no-op under X11
	mRenderBuffer->bindToDynamicTexture(dynamicTexture);
	makeCurrent();
}

void QtGlDebuggerWidget::initCommon()
{
	glEnable(GL_TEXTURE_2D);
	glEnable(GL_DEPTH_TEST);

	glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
}



}