source: trunk/VUT/GtpVisibilityPreprocessor/src/Preprocessor.cpp @ 576

#include "SceneGraph.h"
#include "Exporter.h"
#include "UnigraphicsParser.h"
#include "X3dParser.h"
#include "Preprocessor.h"
#include "ViewCell.h"
#include "Environment.h"
#include "ViewCellsManager.h"
#include "ViewCellBsp.h"
#include "VspBspTree.h"
#include "VspKdTree.h"
#include "RenderSimulator.h"
#include "GlRenderer.h"

Preprocessor *preprocessor;

Preprocessor::Preprocessor():
mKdTree(NULL),
mBspTree(NULL),
mVspKdTree(NULL),
mVspBspTree(NULL),
mViewCellsManager(NULL)
{
  environment->GetBoolValue("Preprocessor.useGlRenderer", mUseGlRenderer);
  
  // renderer will be constructed when the scene graph and viewcell manager will be known
  renderer = NULL;
  
  environment->GetBoolValue("Preprocessor.useGlDebugger", mUseGlDebugger);
}


Preprocessor::~Preprocessor()
{
  Debug<<"Deleting view cells manager...\n";
  DEL_PTR(mViewCellsManager);
  Debug<<"done.\n";
  Debug<<"Deleting bsp tree...\n";
  DEL_PTR(mBspTree);
  Debug<<"done.\n";
  Debug<<"Deleting kd tree...\n";
  DEL_PTR(mKdTree);
  Debug<<"done.\n";
  Debug<<"Deleting vspkd tree...\n";
  DEL_PTR(mVspKdTree);
  Debug<<"done.\n";
  Debug<<"Deleting vspbsp tree...\n";
  DEL_PTR(mVspBspTree);
  Debug<<"done.\n";
}

int
SplitFilenames(const string str, vector<string> &filenames)
{
        int pos = 0;

        while(1) {
                int npos = (int)str.find(';', pos);
                
                if (npos < 0 || npos - pos < 1)
                        break;
                filenames.push_back(string(str, pos, npos - pos));
                pos = npos + 1;
        }
        
        filenames.push_back(string(str, pos, str.size() - pos));
        return (int)filenames.size();
}

bool
Preprocessor::LoadScene(const string filename)
{
        // use leaf nodes of the original spatial hiearrchy as occludees
        mSceneGraph = new SceneGraph;
  
        Parser *parser;
        vector<string> filenames;
        int files = SplitFilenames(filename, filenames);
        cout<<files<<endl;
        bool result = false;
        if (files == 1) {
                
                if (strstr(filename.c_str(), ".x3d"))
                        parser = new X3dParser;
                else
                        parser = new UnigraphicsParser;

                cout<<filename<<endl;
                result = parser->ParseFile(filename, &mSceneGraph->mRoot);

                delete parser;

        } else {
                // root for different files
                mSceneGraph->mRoot = new SceneGraphNode;
                for (int i= 0; i < filenames.size(); i++) {
                        if (strstr(filenames[i].c_str(), ".x3d"))
                                parser = new X3dParser;
                        else
                                parser = new UnigraphicsParser;
                        
                        SceneGraphNode *node;
                        if (parser->ParseFile(filenames[i], &node)) {
                                mSceneGraph->mRoot->mChildren.push_back(node);
                                // at least one file parsed
                                result = true;
                        }
                        delete parser;
                }
        }
        

        if (result) {
          
          mSceneGraph->AssignObjectIds();
          int intersectables, faces;
          mSceneGraph->GetStatistics(intersectables, faces);
          cout<<filename<<" parsed successfully."<<endl;
          cout<<"#NUM_OBJECTS (Total numner of objects)\n"<<intersectables<<endl;
          cout<<"#NUM_FACES (Total numner of faces)\n"<<faces<<endl;
          mSceneGraph->CollectObjects(&mObjects);
          mSceneGraph->mRoot->UpdateBox();
        }
        
        
        return result;
}

bool
Preprocessor::ExportPreprocessedData(const string filename)
{
  return false;
}

bool
Preprocessor::BuildKdTree()
{
  mKdTree = new KdTree;
  // add mesh instances of the scene graph to the root of the tree
  KdLeaf *root = (KdLeaf *)mKdTree->GetRoot();
  mSceneGraph->CollectObjects(&root->mObjects);
  
  mKdTree->Construct();
  return true;
}

void
Preprocessor::KdTreeStatistics(ostream &s)
{
  s<<mKdTree->GetStatistics();
}

void
Preprocessor::BspTreeStatistics(ostream &s)
{
        s << mBspTree->GetStatistics();
}

bool
Preprocessor::Export( const string filename,
                                          const bool scene,
                                          const bool kdtree,
                                          const bool bsptree
                                          )
{
  Exporter *exporter = Exporter::GetExporter(filename);
        
  if (exporter) {
    if (scene)
      exporter->ExportScene(mSceneGraph->mRoot);

    if (kdtree) {
      exporter->SetWireframe();
      exporter->ExportKdTree(*mKdTree);
    }

        if (bsptree) {
                //exporter->SetWireframe();
                exporter->ExportBspTree(*mBspTree);
        }

    delete exporter;
    return true;
  }

  return false;
}


bool Preprocessor::PrepareViewCells()
{
        //-- parse type of view cell container
        char viewCellsStr[64];
        environment->GetStringValue("ViewCells.type", viewCellsStr);

        mViewCellsManager = CreateViewCellsManager(viewCellsStr);

        float objRenderCost = 0, vcOverhead = 0, moveSpeed = 0;

        environment->GetFloatValue("Simulation.objRenderCost",objRenderCost);
        environment->GetFloatValue("Simulation.vcOverhead", vcOverhead);
        environment->GetFloatValue("Simulation.moveSpeed", moveSpeed);

        mRenderSimulator = 
                new RenderSimulator(mViewCellsManager, objRenderCost, vcOverhead, moveSpeed);

        mViewCellsManager->SetRenderer(mRenderSimulator);

        //-- parse view cells construction method
        environment->GetBoolValue("ViewCells.loadFromFile", mLoadViewCells);
        char buf[100];

        if (mLoadViewCells)
        {
                environment->GetStringValue("ViewCells.filename", buf);
                mViewCellsFilename = buf;
        }

        if (mUseGlRenderer || mUseGlDebugger)
        {
                // NOTE: render texture should be power of 2 and square
                // renderer must be initialised
                renderer = new GlRendererBuffer(1024, 768, mSceneGraph, mViewCellsManager, mKdTree);
                //              renderer->makeCurrent();
        }


        environment->GetBoolValue("Preprocessor.detectEmptyViewSpace", mDetectEmptyViewSpace);
        


        return true;
}


ViewCellsManager *Preprocessor::CreateViewCellsManager(const char *name)
{
        if (strcmp(name, "kdTree") == 0)
        {
                mViewCellsManager = new KdViewCellsManager(mKdTree);
        }
        else if (strcmp(name, "bspTree") == 0)
        {
                mBspTree = new BspTree();

                Debug << "view cell type: Bsp" << endl;

                mViewCellsManager = new BspViewCellsManager(mBspTree);
        }
        else if (strcmp(name, "vspBspTree") == 0)
        {
                mVspBspTree = new VspBspTree();

                Debug << "view cell type: VspBsp" << endl;

                mViewCellsManager = new VspBspViewCellsManager(mVspBspTree);
        }
        else if (strcmp(name, "vspKdTree") == 0)
        {
                mVspKdTree = new VspKdTree();           
        
                mViewCellsManager = new VspKdViewCellsManager(mVspKdTree);
        }
        else if (strcmp(name, "sceneDependent") == 0)
        {
                //TODO
                mBspTree = new BspTree();

                Debug << "view cell type: Bsp" << endl;
                
                mViewCellsManager = new BspViewCellsManager(mBspTree);
        }
        else
        {
                cerr<<"Wrong view cells type" << name << endl;
                exit(1);
        }

        return mViewCellsManager;
}


// use ascii format to store rays
#define USE_ASCII 0


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


bool Preprocessor::LoadSamples(VssRayContainer &samples, 
                                                           ObjectContainer &objects) const
{
        std::stable_sort(objects.begin(), objects.end(), ilt);
        char fileName[100];
        environment->GetStringValue("Preprocessor.samplesFilename", fileName);
        
    Vector3 origin, termination;
        // HACK: needed only for lower_bound algorithm to find the 
        // intersected objects
        MeshInstance sObj(NULL);
        MeshInstance tObj(NULL);

#if USE_ASCII
        ifstream samplesIn(fileName, ios::binary);
        if (!samplesIn.is_open())
                return false;

        string buf;
        while (!(getline(samplesIn, buf)).eof())
        {
                sscanf(buf.c_str(), "%f %f %f %f %f %f %d %d", 
                           &origin.x, &origin.y, &origin.z,
                           &termination.x, &termination.y, &termination.z, 
                           &(sObj.mId), &(tObj.mId));
                
                Intersectable *sourceObj = NULL;
                Intersectable *termObj = NULL;
                
                if (sObj.mId >= 0)
                {
                        ObjectContainer::iterator oit =
                                lower_bound(objects.begin(), objects.end(), &sObj, ilt);
                        sourceObj = *oit;
                }
                
                if (tObj.mId >= 0)
                {
                        ObjectContainer::iterator oit =
                                lower_bound(objects.begin(), objects.end(), &tObj, ilt);
                        termObj = *oit;
                }

                samples.push_back(new VssRay(origin, termination, sourceObj, termObj));
        }
#else
        ifstream samplesIn(fileName, ios::binary);
        if (!samplesIn.is_open())
                return false;

        while (1)
        {
                 samplesIn.read(reinterpret_cast<char *>(&origin), sizeof(Vector3));
                 samplesIn.read(reinterpret_cast<char *>(&termination), sizeof(Vector3));
                 samplesIn.read(reinterpret_cast<char *>(&(sObj.mId)), sizeof(int));
                 samplesIn.read(reinterpret_cast<char *>(&(tObj.mId)), sizeof(int));
                
                 if (samplesIn.eof())
                        break;

                Intersectable *sourceObj = NULL;
                Intersectable *termObj = NULL;
                
                if (sObj.mId >= 0)
                {
                        ObjectContainer::iterator oit =
                                lower_bound(objects.begin(), objects.end(), &sObj, ilt);
                        sourceObj = *oit;
                }
                
                if (tObj.mId >= 0)
                {
                        ObjectContainer::iterator oit =
                                lower_bound(objects.begin(), objects.end(), &tObj, ilt);
                        termObj = *oit;
                }

                samples.push_back(new VssRay(origin, termination, sourceObj, termObj));
        }

#endif
        samplesIn.close();

        return true;
}


bool Preprocessor::ExportSamples(const VssRayContainer &samples) const
{
        char fileName[100];
        environment->GetStringValue("Preprocessor.samplesFilename", fileName);
        

        VssRayContainer::const_iterator it, it_end = samples.end();
        
#if USE_ASCII
        ofstream samplesOut(fileName);
        if (!samplesOut.is_open())
                return false;

        for (it = samples.begin(); it != it_end; ++ it)
        {
                VssRay *ray = *it;
                int sourceid = ray->mOriginObject ? ray->mOriginObject->mId : -1;               
                int termid = ray->mTerminationObject ? ray->mTerminationObject->mId : -1;       

                samplesOut << ray->GetOrigin().x << " " << ray->GetOrigin().y << " " << ray->GetOrigin().z << " " 
                                   << ray->GetTermination().x << " " << ray->GetTermination().y << " " << ray->GetTermination().z << " " 
                                   << sourceid << " " << termid << "\n";
        }
#else
        ofstream samplesOut(fileName, ios::binary);
        if (!samplesOut.is_open())
                return false;

        for (it = samples.begin(); it != it_end; ++ it)
        {       
                VssRay *ray = *it;
                Vector3 origin(ray->GetOrigin());
                Vector3 termination(ray->GetTermination());
                
                int sourceid = ray->mOriginObject ? ray->mOriginObject->mId : -1;               
                int termid = ray->mTerminationObject ? ray->mTerminationObject->mId : -1;               

                samplesOut.write(reinterpret_cast<char *>(&origin), sizeof(Vector3));
                samplesOut.write(reinterpret_cast<char *>(&termination), sizeof(Vector3));
                samplesOut.write(reinterpret_cast<char *>(&sourceid), sizeof(int));
                samplesOut.write(reinterpret_cast<char *>(&termid), sizeof(int));
    }
#endif
        samplesOut.close();
        return true;
}



bool
Preprocessor::GenerateRays(
                                                   const int number,
                                                   const int sampleType,
                                                   SimpleRayContainer &rays
                                                   )
{
  Vector3 origin, direction; 
  int startSize = rays.size();
  for (int i=0; rays.size() - startSize  < number; i++) {
        // now get the direction
        switch (sampleType) {
        case OBJECT_BASED_DISTRIBUTION: {
          mViewCellsManager->GetViewPoint(origin);
          Vector3 point;
          Vector3 normal;
          int i = RandomValue(0, mObjects.size() - 1);
          Intersectable *object = mObjects[i];
          object->GetRandomSurfacePoint(point, normal);
          direction = point - origin;
        }
          break;
        case OBJECT_DIRECTION_BASED_DISTRIBUTION: {
          int i = RandomValue(0, mObjects.size() - 1);
          Intersectable *object = mObjects[i];
          Vector3 normal;
          object->GetRandomSurfacePoint(origin, normal);
          direction = UniformRandomVector(normal);
          origin += 0.1f*direction;
        }
          break;
        case DIRECTION_BASED_DISTRIBUTION:
          mViewCellsManager->GetViewPoint(origin);
          direction = UniformRandomVector();
          break;
        case DIRECTION_BOX_BASED_DISTRIBUTION: {
          mViewCellsManager->GetViewPoint(origin);
          float alpha = RandomValue(0.0f, 2*M_PI);
          float beta = RandomValue(-M_PI/2, M_PI/2);
          direction = VssRay::GetDirection(alpha, beta);
          break;
        }
        case SPATIAL_BOX_BASED_DISTRIBUTION:
          mViewCellsManager->GetViewPoint(origin);
          direction = mKdTree->GetBox().GetRandomPoint() - origin;
          break;
        default:
          // unsuported distribution type
          return false;
        }
        // $$ jb the pdf is yet not correct for all sampling methods!
        float pdf = 1.0f;
        float c = Magnitude(direction);
        if (c > Limits::Small) {
          direction*=1.0f/c;
          rays.AddRay(SimpleRay(origin, direction, pdf));
        }
  }
  return true;
}