source: GTP/trunk/App/Demos/Vis/FriendlyCulling/src/ResourceManager.cpp @ 2825

#include "ResourceManager.h"
#include "Matrix4x4.h"
#include "Geometry.h"
#include "SceneEntity.h"
#include "Material.h"
#include "Texture.h"
#include "gzstream.h"
#include "Matrix4x4.h"
#include "Vector3.h"


using namespace std;


namespace CHCDemoEngine
{


ResourceManager::~ResourceManager()
{
        // delete all resources.
        CLEAR_CONTAINER(mSceneEntities);
        CLEAR_CONTAINER(mGeometry);
        CLEAR_CONTAINER(mMaterials);
        CLEAR_CONTAINER(mTextures);
        CLEAR_CONTAINER(mTrafos);
}


SceneEntity *ResourceManager::LoadSceneEntity(igzstream &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;
        
        SceneEntity *sceneGeom;

        if (!hasTrafo)
        {
                trafo = NULL;
        }
        else
        {
                trafo = new Matrix4x4();
                str.read(reinterpret_cast<char *>(trafo->x), sizeof(Matrix4x4));
                mTrafos.push_back(trafo);
        }

        // use instancing
        sceneGeom = new SceneEntity(geom, mat, trafo);

        return sceneGeom;
}


void ResourceManager::LoadTextures(igzstream &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(model_path + texname);

                mTextureTable[i] = tex;
                mTextures.push_back(tex);
        }

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


void ResourceManager::LoadShapes(igzstream &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;

                mGeometry.push_back(geom);
                mMaterials.push_back(mat);
        }

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


Material *ResourceManager::LoadMaterial(igzstream &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->mEmmisiveColor), sizeof(Vector3));
                str.read(reinterpret_cast<char *>(&mat->mSpecularColor), sizeof(Vector3));
        }

        return mat;
}


Geometry *ResourceManager::LoadGeometry(igzstream &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)
        {
                texcoords = new float[texCoordCount * 2];
                str.read(reinterpret_cast<char *>(texcoords), sizeof(float) * vertexCount * 2);
        }
        else
        {
                texcoords = NULL;
        }

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


void ResourceManager::LoadSceneEntities(igzstream &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);
                entities[i] = ent;
                mSceneEntities.push_back(ent);
        }

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


bool ResourceManager::Load(const std::string &filename, SceneEntityContainer &entities)
{
        igzstream istr(filename.c_str());
        
        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;

        // clean up
        mTextureTable.clear();
        mGeometryTable.clear();
        mMaterialTable.clear();

        return true;
}

}