source: trunk/VUT/GtpVisibilityPreprocessor/src/Preprocessor.cpp @ 262

#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)
{
}

Preprocessor::~Preprocessor()
{
  CLEAR_CONTAINER(mViewCells);
  DEL_PTR(mBspTree);
  DEL_PTR(mKdTree);
}

bool
Preprocessor::LoadViewCells(const string filename)
{
        X3dParser *parser = new X3dParser;

        bool result = parser->ParseFile(filename, mViewCells);

        if (result)
        {
                Exporter *exporter = Exporter::GetExporter("viewcells.x3d");

                if (exporter) 
                {
                        exporter->ExportViewCells(&mViewCells);
                        delete exporter;
                }

                Debug << "Generating view cells" << endl;
                GenerateViewCells();
                Debug << "Generated view cells" << endl;
        }

        DEL_PTR(parser);
        

        return result;
}

bool
Preprocessor::GenerateViewCells()
{
        return BuildBspTree();
}

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);
        mBspTree = new BspTree();

        char constructionMethodStr[64];
        int maxViewCells = 0;

        environment->GetIntValue("BspTree.maxViewCells", maxViewCells);
        environment->GetStringValue("BspTree.constructionMethod", constructionMethodStr);

        int constructionMethod = BspTree::VIEWCELLS;
        
        if (strcmp(constructionMethodStr, "viewCells") == 0)
                constructionMethod = BspTree::VIEWCELLS;
        else if (strcmp(constructionMethodStr, "sceneGeometry") == 0)
                constructionMethod = BspTree::SCENE_GEOMETRY;
        else if (strcmp(constructionMethodStr, "rays") == 0)
                constructionMethod = BspTree::RAYS;
        else 
        {
                cerr << "Wrong bsp construction method " << constructionMethodStr << endl;
                exit(1);
    }

        ObjectContainer objects;
        RayContainer rays;

        switch (constructionMethod)
        {
        case BspTree::VIEWCELLS:
                Debug << "Construction method: view cells\n";

                // derive view cells from the scene objects
                if (mViewCells.empty())         
                {
                        Debug << "View cells empty => generating new ones\n"; Debug.flush();
                        mSceneGraph->CollectObjects(&objects);
                        ViewCell::DeriveViewCells(objects, mViewCells, maxViewCells);
                }

                mBspTree->Construct(mViewCells);
                break;
        case BspTree::SCENE_GEOMETRY:
                Debug << "Construction method: geometry\n";

        CLEAR_CONTAINER(mViewCells); // we generate new view cells
                mSceneGraph->CollectObjects(&objects);

                mBspTree->Construct(objects, &mViewCells);
                break;
        case BspTree::RAYS:
                Debug << "Construction method: rays\n";

                CLEAR_CONTAINER(mViewCells); // 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;
}