D3MFExporter.cpp

/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

Copyright (c) 2006-2018, assimp team


All rights reserved.

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following disclaimer.

* Redistributions in binary form must reproduce the above
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*/
#ifndef ASSIMP_BUILD_NO_EXPORT
#ifndef ASSIMP_BUILD_NO_3MF_EXPORTER

#include "D3MFExporter.h"

#include <assimp/scene.h>
#include <assimp/IOSystem.hpp>
#include <assimp/IOStream.hpp>
#include <assimp/Exporter.hpp>
#include <assimp/DefaultLogger.hpp>

#include <assimp/Exceptional.h>
#include "3MFXmlTags.h"
#include "D3MFOpcPackage.h"

#include <contrib/zip/src/zip.h>

namespace Assimp {

void ExportScene3MF( const char* pFile, IOSystem* pIOSystem, const aiScene* pScene, const ExportProperties* /*pProperties*/ ) {
    if ( nullptr == pIOSystem ) {
        throw DeadlyExportError( "Could not export 3MP archive: " + std::string( pFile ) );
    }
    D3MF::D3MFExporter myExporter( pFile, pScene );
    if ( myExporter.validate() ) {
        if ( pIOSystem->Exists( pFile ) ) {
            if ( !pIOSystem->DeleteFile( pFile ) ) {
                throw DeadlyExportError( "File exists, cannot override : " + std::string( pFile ) );
            }
        }
        bool ok = myExporter.exportArchive(pFile);
        if ( !ok ) {
            throw DeadlyExportError( "Could not export 3MP archive: " + std::string( pFile ) );
        }
    }
}

namespace D3MF {

D3MFExporter::D3MFExporter( const char* pFile, const aiScene* pScene )
: mArchiveName( pFile )
, m_zipArchive( nullptr )
, mScene( pScene )
, mModelOutput()
, mRelOutput()
, mContentOutput()
, mBuildItems()
, mRelations() {
    // empty
}

D3MFExporter::~D3MFExporter() {
    for ( size_t i = 0; i < mRelations.size(); ++i ) {
        delete mRelations[ i ];
    }
    mRelations.clear();
}

bool D3MFExporter::validate() {
    if ( mArchiveName.empty() ) {
        return false;
    }

    if ( nullptr == mScene ) {
        return false;
    }

    return true;
}

bool D3MFExporter::exportArchive( const char *file ) {
    bool ok( true );

    m_zipArchive = zip_open( file, ZIP_DEFAULT_COMPRESSION_LEVEL, 'w' );
    if ( nullptr == m_zipArchive ) {
        return false;
    }
    ok |= exportContentTypes();
    ok |= export3DModel();
    ok |= exportRelations();

    zip_close( m_zipArchive );
    m_zipArchive = nullptr;

    return ok;
}


bool D3MFExporter::exportContentTypes() {
    mContentOutput.clear();

    mContentOutput << "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
    mContentOutput << std::endl;
    mContentOutput << "<Types xmlns = \"http://schemas.openxmlformats.org/package/2006/content-types\">";
    mContentOutput << std::endl;
    mContentOutput << "<Default Extension = \"rels\" ContentType = \"application/vnd.openxmlformats-package.relationships+xml\" />";
    mContentOutput << std::endl;
    mContentOutput << "<Default Extension = \"model\" ContentType = \"application/vnd.ms-package.3dmanufacturing-3dmodel+xml\" />";
    mContentOutput << std::endl;
    mContentOutput << "</Types>";
    mContentOutput << std::endl;
    exportContentTyp( XmlTag::CONTENT_TYPES_ARCHIVE );

    return true;
}

bool D3MFExporter::exportRelations() {
    mRelOutput.clear();

    mRelOutput << "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
    mRelOutput << std::endl;
    mRelOutput << "<Relationships xmlns=\"http://schemas.openxmlformats.org/package/2006/relationships\">";

    for ( size_t i = 0; i < mRelations.size(); ++i ) {
        mRelOutput << "<Relationship Target=\"/" << mRelations[ i ]->target << "\" ";
        mRelOutput << "Id=\"" << mRelations[i]->id << "\" ";
        mRelOutput << "Type=\"" << mRelations[ i ]->type << "\" />";
        mRelOutput << std::endl;
    }
    mRelOutput << "</Relationships>";
    mRelOutput << std::endl;

    writeRelInfoToFile( "_rels", ".rels" );
    mRelOutput.flush();

    return true;
}

bool D3MFExporter::export3DModel() {
    mModelOutput.clear();

    writeHeader();
    mModelOutput << "<" << XmlTag::model << " " << XmlTag::model_unit << "=\"millimeter\""
            << "xmlns=\"http://schemas.microsoft.com/3dmanufacturing/core/2015/02\">"
            << std::endl;
    mModelOutput << "<" << XmlTag::resources << ">";
    mModelOutput << std::endl;

    writeObjects();


    mModelOutput << "</" << XmlTag::resources << ">";
    mModelOutput << std::endl;
    writeBuild();

    mModelOutput << "</" << XmlTag::model << ">\n";

    OpcPackageRelationship *info = new OpcPackageRelationship;
    info->id = "rel0";
    info->target = "/3D/3DModel.model";
    info->type = XmlTag::PACKAGE_START_PART_RELATIONSHIP_TYPE;
    mRelations.push_back( info );

    writeModelToArchive( "3D", "3DModel.model" );
    mModelOutput.flush();

    return true;
}

void D3MFExporter::writeHeader() {
    mModelOutput << "<?xml version=\"1.0\" encoding=\"UTF - 8\"?>";
    mModelOutput << std::endl;
}

void D3MFExporter::writeObjects() {
    if ( nullptr == mScene->mRootNode ) {
        return;
    }

    aiNode *root = mScene->mRootNode;
    for ( unsigned int i = 0; i < root->mNumChildren; ++i ) {
        aiNode *currentNode( root->mChildren[ i ] );
        if ( nullptr == currentNode ) {
            continue;
        }
        mModelOutput << "<" << XmlTag::object << " id=\"" << currentNode->mName.C_Str() << "\" type=\"model\">";
        mModelOutput << std::endl;
        for ( unsigned int j = 0; j < currentNode->mNumMeshes; ++j ) {
            aiMesh *currentMesh = mScene->mMeshes[ currentNode->mMeshes[ j ] ];
            if ( nullptr == currentMesh ) {
                continue;
            }
            writeMesh( currentMesh );
        }
        mBuildItems.push_back( i );

        mModelOutput << "</" << XmlTag::object << ">";
        mModelOutput << std::endl;
    }
}

void D3MFExporter::writeMesh( aiMesh *mesh ) {
    if ( nullptr == mesh ) {
        return;
    }

    mModelOutput << "<" << XmlTag::mesh << ">" << std::endl;
    mModelOutput << "<" << XmlTag::vertices << ">" << std::endl;
    for ( unsigned int i = 0; i < mesh->mNumVertices; ++i ) {
        writeVertex( mesh->mVertices[ i ] );
    }
    mModelOutput << "</" << XmlTag::vertices << ">" << std::endl;

    writeFaces( mesh );

    mModelOutput << "</" << XmlTag::mesh << ">" << std::endl;
}

void D3MFExporter::writeVertex( const aiVector3D &pos ) {
    mModelOutput << "<" << XmlTag::vertex << " x=\"" << pos.x << "\" y=\"" << pos.y << "\" z=\"" << pos.z << "\" />";
    mModelOutput << std::endl;
}

void D3MFExporter::writeFaces( aiMesh *mesh ) {
    if ( nullptr == mesh ) {
        return;
    }

    if ( !mesh->HasFaces() ) {
        return;
    }
    mModelOutput << "<" << XmlTag::triangles << ">" << std::endl;
    for ( unsigned int i = 0; i < mesh->mNumFaces; ++i ) {
        aiFace &currentFace = mesh->mFaces[ i ];
        mModelOutput << "<" << XmlTag::triangle << " v1=\"" << currentFace.mIndices[ 0 ] << "\" v2=\""
                << currentFace.mIndices[ 1 ] << "\" v3=\"" << currentFace.mIndices[ 2 ] << "\"/>";
        mModelOutput << std::endl;
    }
    mModelOutput << "</" << XmlTag::triangles << ">";
    mModelOutput << std::endl;
}

void D3MFExporter::writeBuild() {
    mModelOutput << "<" << XmlTag::build << ">" << std::endl;

    for ( size_t i = 0; i < mBuildItems.size(); ++i ) {
        mModelOutput << "<" << XmlTag::item << " objectid=\"" << i + 1 << "\"/>";
        mModelOutput << std::endl;
    }
    mModelOutput << "</" << XmlTag::build << ">";
    mModelOutput << std::endl;
}

void D3MFExporter::exportContentTyp( const std::string &filename ) {
    if ( nullptr == m_zipArchive ) {
        throw DeadlyExportError( "3MF-Export: Zip archive not valid, nullptr." );
    }
    const std::string entry = filename;
    zip_entry_open( m_zipArchive, entry.c_str() );

    const std::string &exportTxt( mContentOutput.str() );
    zip_entry_write( m_zipArchive, exportTxt.c_str(), exportTxt.size() );

    zip_entry_close( m_zipArchive );
}

void D3MFExporter::writeModelToArchive( const std::string &folder, const std::string &modelName ) {
    if ( nullptr == m_zipArchive ) {
        throw DeadlyExportError( "3MF-Export: Zip archive not valid, nullptr." );
    }
    const std::string entry = folder + "/" + modelName;
    zip_entry_open( m_zipArchive, entry.c_str() );

    const std::string &exportTxt( mModelOutput.str() );
    zip_entry_write( m_zipArchive, exportTxt.c_str(), exportTxt.size() );

    zip_entry_close( m_zipArchive );
}

void D3MFExporter::writeRelInfoToFile( const std::string &folder, const std::string &relName ) {
    if ( nullptr == m_zipArchive ) {
        throw DeadlyExportError( "3MF-Export: Zip archive not valid, nullptr." );
    }
    const std::string entry = folder + "/" + relName;
    zip_entry_open( m_zipArchive, entry.c_str() );

    const std::string &exportTxt( mRelOutput.str() );
    zip_entry_write( m_zipArchive, exportTxt.c_str(), exportTxt.size() );

    zip_entry_close( m_zipArchive );
}


} // Namespace D3MF
} // Namespace Assimp

#endif // ASSIMP_BUILD_NO_3MF_EXPORTER
#endif // ASSIMP_BUILD_NO_EXPORT