source: trunk/VUT/GtpVisibilityPreprocessor/src/Preprocessor.cpp @ 313

#include "SceneGraph.h"
#include "Exporter.h"
#include "UnigraphicsParser.h"
#include "X3dParser.h"
#include "Preprocessor.h"
#include "ViewCell.h"
#include "Environment.h"

Preprocessor::Preprocessor():
mKdTree(NULL),
mBspTree(NULL),
mRootViewCell(NULL),
mViewCellsType(BSP_VIEW_CELLS)
{
}

Preprocessor::~Preprocessor()
{
        DeleteViewCells();
                
        DEL_PTR(mBspTree);
        DEL_PTR(mKdTree);
        DEL_PTR(mRootViewCell);
}

bool
Preprocessor::LoadViewCells(const string filename)
{
        X3dParser parser;
        int maxViewCells = 0;
        environment->GetFloatValue("ViewCells.height", parser.mViewCellHeight);
        environment->GetIntValue("ViewCells.maxViewCells", maxViewCells);

        bool loaded = parser.ParseFile(filename, mViewCells);

        if (maxViewCells > 0)
        {
                while (mViewCells.size() > maxViewCells)
                {
                        ViewCell *vc = mViewCells.back();
                        DEL_PTR(vc);
                        mViewCells.pop_back();
                }
        }
        return loaded;
}

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

        int vcType = BSP_VIEW_CELLS;
  
        if (strcmp(viewCellsStr, "bspTree") == 0)
                vcType = BSP_VIEW_CELLS;
        else if (strcmp(viewCellsStr, "kdTree") == 0)
                vcType = KD_VIEW_CELLS;
        else if (strcmp(viewCellsStr, "sceneDependent") == 0)
                vcType = SCENE_DEPENDENT;
        else
        {
                cerr<<"Wrong view cells type" << viewCellsStr << endl;
                exit(1);
        }

        // decide about view cell subdivision type used for preprocessing
        switch (vcType)
        {
        case BSP_VIEW_CELLS:
        case KD_VIEW_CELLS:
                mViewCellsType = vcType;
                break;
        case SCENE_DEPENDENT:
                mViewCellsType = BSP_VIEW_CELLS; // TODO
                break;
        }

        return true;
}

void Preprocessor::DeleteViewCells()
{
        for (int i = 0; i < mViewCells.size(); ++ i)
                delete mViewCells[i]->GetMesh();

        CLEAR_CONTAINER(mViewCells);
}

bool
Preprocessor::GenerateViewCells()
{
        // TODO
        // HACK: derive view cells from the scene objects
        ObjectContainer objects;

        int maxViewCells = 0;
        environment->GetIntValue("ViewCells.maxViewCells", maxViewCells);

        mSceneGraph->CollectObjects(&objects);
        ViewCell::DeriveViewCells(objects, mViewCells, maxViewCells);

        return true;
}

bool
Preprocessor::LoadScene(const string filename)
{
  // use leaf nodes of the original spatial hiearrchy as occludees

  mSceneGraph = new SceneGraph;

  
  Parser *parser;

  if (strstr(filename.c_str(), ".x3d"))
    parser = new X3dParser;
  else
    parser = new UnigraphicsParser;

  bool result = parser->ParseFile(filename, &mSceneGraph->mRoot);
  
  delete parser;

  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;
}


bool
Preprocessor::BuildBspTree()
{
        DEL_PTR(mBspTree);
        DEL_PTR(mRootViewCell);
        mRootViewCell = new ViewCell(NULL);
        mBspTree = new BspTree(mRootViewCell);

        ObjectContainer objects;
        RayContainer rays;

        switch (BspTree::sConstructionMethod)
        {
        case BspTree::FROM_INPUT_VIEW_CELLS:
                mBspTree->Construct(mViewCells);
                break;
        case BspTree::FROM_SCENE_GEOMETRY:
                DeleteViewCells(); // we generate new view cells
                mSceneGraph->CollectObjects(&objects);
                mBspTree->Construct(objects, &mViewCells);
                break;
        case BspTree::FROM_RAYS:
                DeleteViewCells(); // we generate new view cells        
                mBspTree->Construct(rays, &mViewCells);
                break;
        default:
                Debug << "Error: Method not available\n";
                break;
        }
        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;
}