source: GTP/trunk/App/Demos/Vis/CHC_revisited/BinaryLoader.cpp @ 2769

#include "BinaryLoader.h"
#include "Matrix4x4.h"
#include "Geometry.h"
#include "SceneEntity.h"
#include "Material.h"
#include "Texture.h"
//#include "gzstream.h"


using namespace std;


namespace CHCDemo
{


//SceneEntity *BinaryLoader::LoadSceneEntity(igzstream &str)
SceneEntity *BinaryLoader::LoadSceneEntity(ifstream &str)
{       
        // shape
        int shapeId;
        str.read(reinterpret_cast<char *>(&shapeId), sizeof(int));

        Geometry *geom = mGeometryTable[shapeId];
        Material *mat = mMaterialTable[shapeId];


        bool hasTrafo;
        str.read(reinterpret_cast<char *>(&hasTrafo), sizeof(bool));

        Matrix4x4 *trafo;
        
        if (!hasTrafo)
        {
                trafo = NULL;
        }
        else
        {
                trafo = new Matrix4x4();
                //*trafo = IdentityMatrix();
                str.read(reinterpret_cast<char *>(trafo->x), sizeof(Matrix4x4));
                //str.read(reinterpret_cast<char *>(trafo), sizeof(Matrix4x4));
                //cout << "m:\n" << *trafo<<endl;
        }

        SceneEntity *sceneGeom = new SceneEntity(geom, mat, trafo);

        return sceneGeom;
}


void BinaryLoader::LoadTextures(ifstream &str)
{
        int numTextures;
        str.read(reinterpret_cast<char *>(&numTextures), sizeof(int));

        for (int i = 0; i < numTextures; ++ i)
        {
                // texture
                int texnameSize;

                //str.read(reinterpret_cast<char *>(&id), sizeof(int));
                str.read(reinterpret_cast<char *>(&texnameSize), sizeof(int));

                char *texname = new char[texnameSize];
                str.read(texname, sizeof(char) * texnameSize);

                //cout << "loading texture " << texname << " with len " << texnameSize << " id: " << id << endl;
                Texture *tex = new Texture(texname);

                mTextureTable[i] = tex;
        }

        cout << "loaded " << mTextureTable.size() << " textures" << endl;
}


void BinaryLoader::LoadShapes(ifstream &str)
{
        int numShapes;
        str.read(reinterpret_cast<char *>(&numShapes), sizeof(int));

        for (int i = 0; i < numShapes; ++ i)
        {
                Geometry *geom = LoadGeometry(str);
                Material *mat = LoadMaterial(str);

                mGeometryTable[i] = geom;
                mMaterialTable[i] = mat;
        }

        cout << "loaded " << mGeometryTable.size() << " shapes" << endl;
}


//Appearance *BinaryLoader::LoadMaterial(igzstream &str)
Material *BinaryLoader::LoadMaterial(ifstream &str)
{
        // default material
        Material *mat = new Material();
        
        // texture
        int texId;
        str.read(reinterpret_cast<char *>(&texId), sizeof(int));

        if (texId >= 0)
                mat->SetTexture(mTextureTable[texId]);
        
        str.read(reinterpret_cast<char *>(&mat->mAlphaTestEnabled), sizeof(bool));

        // material
        bool hasMaterial;
        str.read(reinterpret_cast<char *>(&hasMaterial), sizeof(bool));
        
        if (hasMaterial)
        {
                // only write rgb part of the material
                str.read(reinterpret_cast<char *>(&mat->mAmbientColor), sizeof(Vector3));
                str.read(reinterpret_cast<char *>(&mat->mDiffuseColor), sizeof(Vector3));
                str.read(reinterpret_cast<char *>(&mat->mSpecularColor), sizeof(Vector3));
                
                /*RgbColor dum;
                str.read(reinterpret_cast<char *>(&dum), sizeof(RgbColor));
                str.read(reinterpret_cast<char *>(&dum), sizeof(RgbColor));
                str.read(reinterpret_cast<char *>(&dum), sizeof(RgbColor));
                */
        }

        return mat;
}


//Geometry *BinaryLoader::LoadGeometry(igzstream &str)
Geometry *BinaryLoader::LoadGeometry(ifstream &str)
{
        Vector3 *vertices;
        Vector3 *normals;
        float *texcoords;


        //////////////
        //-- read in vertices

        int vertexCount;
        str.read(reinterpret_cast<char *>(&vertexCount), sizeof(int));
        
        // end of file reached
        if (str.eof())
                return NULL;

        //cout << "vertexcount: " << vertexCount << endl;

        vertices = new Vector3[vertexCount];
    str.read(reinterpret_cast<char *>(vertices), sizeof(Vector3) * vertexCount);
        
        normals = new Vector3[vertexCount];
        str.read(reinterpret_cast<char *>(normals), sizeof(Vector3) * vertexCount);

        int texCoordCount;
        str.read(reinterpret_cast<char *>(&texCoordCount), sizeof(int));

        if (texCoordCount)
        {
                //cout << "loading texcoords of size " << texCoordCount << endl;
                texcoords = new float[texCoordCount * 2];
                str.read(reinterpret_cast<char *>(texcoords), sizeof(float) * vertexCount * 2);
        }
        else
                texcoords = NULL;

        for (int i = 0; i < vertexCount; i += 3)
        {
                Triangle3 tri(vertices[i], vertices[i + 1], vertices[i + 2]);
                Vector3 n = tri.GetNormal();

                normals[i + 0] = n;
                normals[i + 1] = n;
                normals[i + 2] = n;
        }

        return new Geometry(vertices, normals, texcoords, vertexCount);
}


void BinaryLoader::LoadSceneEntities(ifstream &str, SceneEntityContainer &entities)
{
        int entityCount;
        str.read(reinterpret_cast<char *>(&entityCount), sizeof(int));

        entities.resize(entityCount);

        for (int i = 0; i < entityCount; ++ i)
        {
                SceneEntity *ent = LoadSceneEntity(str);
                ent->id = i;
                entities[i] = ent;
        }

        cout << "loaded " << entityCount << " scene entities" << endl;
}


bool BinaryLoader::Load(const std::string &filename, SceneEntityContainer &entities)
{
        //clear_textures(); // clear the texture table

        //igzstream str(filename.c_str());//, ios::binary);
        ifstream istr(filename.c_str(), ios::binary);
        
        if (!istr.is_open())
                return false;

        cout << "loading textures" << endl;
        
        // load the texture table
        LoadTextures(istr);

        cout << "loading shapes (geometry + materials)" << endl;

        // load the shapees
        LoadShapes(istr);

        cout << "loading scene entites" << endl;
        LoadSceneEntities(istr, entities);
        
        cout << "bin loading finished" << endl;

        return true;
}

}