assimp.assimp/code/ObjFileParser.cpp

/*
---------------------------------------------------------------------------
Open Asset Import Library (assimp)
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All rights reserved.

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  copyright notice, this list of conditions and the
  following disclaimer.

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  derived from this software without specific prior
  written permission of the assimp team.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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*/


#ifndef ASSIMP_BUILD_NO_OBJ_IMPORTER

#include "ObjFileParser.h"
#include "ObjFileMtlImporter.h"
#include "ObjTools.h"
#include "ObjFileData.h"
#include "ParsingUtils.h"
#include "DefaultIOSystem.h"
#include "BaseImporter.h"
#include <assimp/DefaultLogger.hpp>
#include <assimp/material.h>
#include <assimp/Importer.hpp>
#include <cstdlib>


namespace Assimp {

const std::string ObjFileParser::DEFAULT_MATERIAL = AI_DEFAULT_MATERIAL_NAME;

// -------------------------------------------------------------------
//  Constructor with loaded data and directories.
ObjFileParser::ObjFileParser(std::vector<char> &Data,const std::string &strModelName, IOSystem *io ) :
    m_DataIt(Data.begin()),
    m_DataItEnd(Data.end()),
    m_pModel(NULL),
    m_uiLine(0),
    m_pIO( io )
{
    std::fill_n(m_buffer,BUFFERSIZE,0);

    // Create the model instance to store all the data
    m_pModel = new ObjFile::Model();
    m_pModel->m_ModelName = strModelName;

    // create default material and store it
    m_pModel->m_pDefaultMaterial = new ObjFile::Material();
    m_pModel->m_pDefaultMaterial->MaterialName.Set( DEFAULT_MATERIAL );
    m_pModel->m_MaterialLib.push_back( DEFAULT_MATERIAL );
    m_pModel->m_MaterialMap[ DEFAULT_MATERIAL ] = m_pModel->m_pDefaultMaterial;

    // Start parsing the file
    parseFile();
}

// -------------------------------------------------------------------
//  Destructor
ObjFileParser::~ObjFileParser()
{
    delete m_pModel;
    m_pModel = NULL;
}

// -------------------------------------------------------------------
//  Returns a pointer to the model instance.
ObjFile::Model *ObjFileParser::GetModel() const
{
    return m_pModel;
}

// -------------------------------------------------------------------
//  File parsing method.
void ObjFileParser::parseFile()
{
    if (m_DataIt == m_DataItEnd)
        return;

    while (m_DataIt != m_DataItEnd)
    {
        switch (*m_DataIt)
        {
        case 'v': // Parse a vertex texture coordinate
            {
                ++m_DataIt;
                if (*m_DataIt == ' ' || *m_DataIt == '\t') {
                    // read in vertex definition
                    getVector3(m_pModel->m_Vertices);
                } else if (*m_DataIt == 't') {
                    // read in texture coordinate ( 2D or 3D )
                                        ++m_DataIt;
                                        getVector( m_pModel->m_TextureCoord );
                } else if (*m_DataIt == 'n') {
                    // Read in normal vector definition
                    ++m_DataIt;
                    getVector3( m_pModel->m_Normals );
                }
            }
            break;

        case 'p': // Parse a face, line or point statement
        case 'l':
        case 'f':
            {
                getFace(*m_DataIt == 'f' ? aiPrimitiveType_POLYGON : (*m_DataIt == 'l'
                    ? aiPrimitiveType_LINE : aiPrimitiveType_POINT));
            }
            break;

        case '#': // Parse a comment
            {
                getComment();
            }
            break;

        case 'u': // Parse a material desc. setter
            {
                getMaterialDesc();
            }
            break;

        case 'm': // Parse a material library or merging group ('mg')
            {
                if (*(m_DataIt + 1) == 'g')
                    getGroupNumberAndResolution();
                else
                    getMaterialLib();
            }
            break;

        case 'g': // Parse group name
            {
                getGroupName();
            }
            break;

        case 's': // Parse group number
            {
                getGroupNumber();
            }
            break;

        case 'o': // Parse object name
            {
                getObjectName();
            }
            break;

        default:
            {
                m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
            }
            break;
        }
    }
}

// -------------------------------------------------------------------
//  Copy the next word in a temporary buffer
void ObjFileParser::copyNextWord(char *pBuffer, size_t length)
{
    size_t index = 0;
    m_DataIt = getNextWord<DataArrayIt>(m_DataIt, m_DataItEnd);
    while( m_DataIt != m_DataItEnd && !IsSpaceOrNewLine( *m_DataIt ) ) {
        pBuffer[index] = *m_DataIt;
        index++;
        if( index == length - 1 ) {
            break;
        }
        ++m_DataIt;
    }

    ai_assert(index < length);
    pBuffer[index] = '\0';
}

// -------------------------------------------------------------------
// Copy the next line into a temporary buffer
void ObjFileParser::copyNextLine(char *pBuffer, size_t length)
{
    size_t index = 0u;

    // some OBJ files have line continuations using \ (such as in C++ et al)
    bool continuation = false;
    for (;m_DataIt != m_DataItEnd && index < length-1; ++m_DataIt)
    {
        const char c = *m_DataIt;
        if (c == '\\') {
            continuation = true;
            continue;
        }

        if (c == '\n' || c == '\r') {
            if(continuation) {
                pBuffer[ index++ ] = ' ';
                continue;
            }
            break;
        }

        continuation = false;
        pBuffer[ index++ ] = c;
    }
    ai_assert(index < length);
    pBuffer[ index ] = '\0';
}

// -------------------------------------------------------------------
void ObjFileParser::getVector( std::vector<aiVector3D> &point3d_array ) {
    size_t numComponents( 0 );
    const char* tmp( &m_DataIt[0] );
    while( !IsLineEnd( *tmp ) ) {
        if ( !SkipSpaces( &tmp ) ) {
            break;
        }
        SkipToken( tmp );
        ++numComponents;
    }
    float x, y, z;
    if( 2 == numComponents ) {
        copyNextWord( m_buffer, BUFFERSIZE );
        x = ( float ) fast_atof( m_buffer );

        copyNextWord( m_buffer, BUFFERSIZE );
        y = ( float ) fast_atof( m_buffer );
        z = 0.0;
    } else if( 3 == numComponents ) {
        copyNextWord( m_buffer, BUFFERSIZE );
        x = ( float ) fast_atof( m_buffer );

        copyNextWord( m_buffer, BUFFERSIZE );
        y = ( float ) fast_atof( m_buffer );

        copyNextWord( m_buffer, BUFFERSIZE );
        z = ( float ) fast_atof( m_buffer );
    } else {
        throw DeadlyImportError( "OBJ: Invalid number of components" );
    }
    point3d_array.push_back( aiVector3D( x, y, z ) );
    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
}

// -------------------------------------------------------------------
//  Get values for a new 3D vector instance
void ObjFileParser::getVector3(std::vector<aiVector3D> &point3d_array) {
    float x, y, z;
    copyNextWord(m_buffer, BUFFERSIZE);
    x = (float) fast_atof(m_buffer);

    copyNextWord(m_buffer, BUFFERSIZE);
    y = (float) fast_atof(m_buffer);

    copyNextWord( m_buffer, BUFFERSIZE );
    z = ( float ) fast_atof( m_buffer );

    point3d_array.push_back( aiVector3D( x, y, z ) );
    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
}

// -------------------------------------------------------------------
//  Get values for a new 2D vector instance
void ObjFileParser::getVector2( std::vector<aiVector2D> &point2d_array ) {
    float x, y;
    copyNextWord(m_buffer, BUFFERSIZE);
    x = (float) fast_atof(m_buffer);

    copyNextWord(m_buffer, BUFFERSIZE);
    y = (float) fast_atof(m_buffer);

    point2d_array.push_back(aiVector2D(x, y));

    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
}

// -------------------------------------------------------------------
//  Get values for a new face instance
void ObjFileParser::getFace(aiPrimitiveType type)
{
    copyNextLine(m_buffer, BUFFERSIZE);
    if (m_DataIt == m_DataItEnd)
        return;

    char *pPtr = m_buffer;
    char *pEnd = &pPtr[BUFFERSIZE];
    pPtr = getNextToken<char*>(pPtr, pEnd);
    if (pPtr == pEnd || *pPtr == '\0')
        return;

    std::vector<unsigned int> *pIndices = new std::vector<unsigned int>;
    std::vector<unsigned int> *pTexID = new std::vector<unsigned int>;
    std::vector<unsigned int> *pNormalID = new std::vector<unsigned int>;
    bool hasNormal = false;

    const int vSize = m_pModel->m_Vertices.size();
    const int vtSize = m_pModel->m_TextureCoord.size();
    const int vnSize = m_pModel->m_Normals.size();

    const bool vt = (!m_pModel->m_TextureCoord.empty());
    const bool vn = (!m_pModel->m_Normals.empty());
    int iStep = 0, iPos = 0;
    while (pPtr != pEnd)
    {
        iStep = 1;

        if (IsLineEnd(*pPtr))
            break;

        if (*pPtr=='/' )
        {
            if (type == aiPrimitiveType_POINT) {
                DefaultLogger::get()->error("Obj: Separator unexpected in point statement");
            }
            if (iPos == 0)
            {
                //if there are no texture coordinates in the file, but normals
                if (!vt && vn) {
                    iPos = 1;
                    iStep++;
                }
            }
            iPos++;
        }
        else if( IsSpaceOrNewLine( *pPtr ) )
        {
            iPos = 0;
        }
        else
        {
            //OBJ USES 1 Base ARRAYS!!!!
            const int iVal = atoi( pPtr );

            // increment iStep position based off of the sign and # of digits
            int tmp = iVal;
            if (iVal < 0)
                ++iStep;
            while ( ( tmp = tmp / 10 )!=0 )
                ++iStep;

            if ( iVal > 0 )
            {
                // Store parsed index
                if ( 0 == iPos )
                {
                    pIndices->push_back( iVal-1 );
                }
                else if ( 1 == iPos )
                {
                    pTexID->push_back( iVal-1 );
                }
                else if ( 2 == iPos )
                {
                    pNormalID->push_back( iVal-1 );
                    hasNormal = true;
                }
                else
                {
                    reportErrorTokenInFace();
                }
            }
            else if ( iVal < 0 )
            {
                // Store relatively index
                if ( 0 == iPos )
                {
                    pIndices->push_back( vSize + iVal );
                }
                else if ( 1 == iPos )
                {
                    pTexID->push_back( vtSize + iVal );
                }
                else if ( 2 == iPos )
                {
                    pNormalID->push_back( vnSize + iVal );
                    hasNormal = true;
                }
                else
                {
                    reportErrorTokenInFace();
                }
            }
        }
        pPtr += iStep;
    }

    if ( pIndices->empty() ) {
        DefaultLogger::get()->error("Obj: Ignoring empty face");
        // skip line and clean up 
        m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
        delete pNormalID;
        delete pTexID;
        delete pIndices;

        return;
    }

    ObjFile::Face *face = new ObjFile::Face( pIndices, pNormalID, pTexID, type );

    // Set active material, if one set
    if( NULL != m_pModel->m_pCurrentMaterial ) {
        face->m_pMaterial = m_pModel->m_pCurrentMaterial;
    } else {
        face->m_pMaterial = m_pModel->m_pDefaultMaterial;
    }

    // Create a default object, if nothing is there
    if( NULL == m_pModel->m_pCurrent ) {
        createObject( "defaultobject" );
    }

    // Assign face to mesh
    if ( NULL == m_pModel->m_pCurrentMesh ) {
        createMesh();
    }

    // Store the face
    m_pModel->m_pCurrentMesh->m_Faces.push_back( face );
    m_pModel->m_pCurrentMesh->m_uiNumIndices += (unsigned int)face->m_pVertices->size();
    m_pModel->m_pCurrentMesh->m_uiUVCoordinates[ 0 ] += (unsigned int)face->m_pTexturCoords[0].size();
    if( !m_pModel->m_pCurrentMesh->m_hasNormals && hasNormal ) {
        m_pModel->m_pCurrentMesh->m_hasNormals = true;
    }
    // Skip the rest of the line
    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
}

// -------------------------------------------------------------------
//  Get values for a new material description
void ObjFileParser::getMaterialDesc()
{
    // Each material request a new object.
    // Sometimes the object is already created (see 'o' tag by example), but it is not initialized !
    // So, we create a new object only if the current on is already initialized !
    if (m_pModel->m_pCurrent != NULL &&
        (   m_pModel->m_pCurrent->m_Meshes.size() > 1 ||
            (m_pModel->m_pCurrent->m_Meshes.size() == 1 && m_pModel->m_Meshes[m_pModel->m_pCurrent->m_Meshes[0]]->m_Faces.size() != 0)  )
        )
        m_pModel->m_pCurrent = NULL;

    // Get next data for material data
    m_DataIt = getNextToken<DataArrayIt>(m_DataIt, m_DataItEnd);
    if (m_DataIt == m_DataItEnd)
        return;

    char *pStart = &(*m_DataIt);
    while( m_DataIt != m_DataItEnd && !IsLineEnd( *m_DataIt ) ) {
        ++m_DataIt;
    }

    // Get name
    std::string strName(pStart, &(*m_DataIt));
    if ( strName.empty())
        return;

    // Search for material
    std::map<std::string, ObjFile::Material*>::iterator it = m_pModel->m_MaterialMap.find( strName );
    if ( it == m_pModel->m_MaterialMap.end() )
    {
        // Not found, use default material
        m_pModel->m_pCurrentMaterial = m_pModel->m_pDefaultMaterial;
        DefaultLogger::get()->error("OBJ: failed to locate material " + strName + ", skipping");
    }
    else
    {
        // Found, using detected material
        m_pModel->m_pCurrentMaterial = (*it).second;
        if ( needsNewMesh( strName ))
        {
            createMesh();
        }
        m_pModel->m_pCurrentMesh->m_uiMaterialIndex = getMaterialIndex( strName );
    }

    // Skip rest of line
    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
}

// -------------------------------------------------------------------
//  Get a comment, values will be skipped
void ObjFileParser::getComment()
{
    while (m_DataIt != m_DataItEnd)
    {
        if ( '\n' == (*m_DataIt))
        {
            ++m_DataIt;
            break;
        }
        else
        {
            ++m_DataIt;
        }
    }
}

// -------------------------------------------------------------------
//  Get material library from file.
void ObjFileParser::getMaterialLib()
{
    // Translate tuple
    m_DataIt = getNextToken<DataArrayIt>(m_DataIt, m_DataItEnd);
    if( m_DataIt == m_DataItEnd ) {
        return;
    }

    char *pStart = &(*m_DataIt);
    while( m_DataIt != m_DataItEnd && !IsLineEnd( *m_DataIt ) ) {
        ++m_DataIt;
    }

    // Check for existence
    const std::string strMatName(pStart, &(*m_DataIt));
    IOStream *pFile = m_pIO->Open(strMatName);

    if (!pFile )
    {
        DefaultLogger::get()->error("OBJ: Unable to locate material file " + strMatName);
        m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
        return;
    }

    // Import material library data from file
    std::vector<char> buffer;
    BaseImporter::TextFileToBuffer(pFile,buffer);
    m_pIO->Close( pFile );

    // Importing the material library
    ObjFileMtlImporter mtlImporter( buffer, strMatName, m_pModel );
}

// -------------------------------------------------------------------
//  Set a new material definition as the current material.
void ObjFileParser::getNewMaterial()
{
    m_DataIt = getNextToken<DataArrayIt>(m_DataIt, m_DataItEnd);
    m_DataIt = getNextWord<DataArrayIt>(m_DataIt, m_DataItEnd);
    if( m_DataIt == m_DataItEnd ) {
        return;
    }

    char *pStart = &(*m_DataIt);
    std::string strMat( pStart, *m_DataIt );
    while( m_DataIt != m_DataItEnd && IsSpaceOrNewLine( *m_DataIt ) ) {
        ++m_DataIt;
    }
    std::map<std::string, ObjFile::Material*>::iterator it = m_pModel->m_MaterialMap.find( strMat );
    if ( it == m_pModel->m_MaterialMap.end() )
    {
        // Show a warning, if material was not found
        DefaultLogger::get()->warn("OBJ: Unsupported material requested: " + strMat);
        m_pModel->m_pCurrentMaterial = m_pModel->m_pDefaultMaterial;
    }
    else
    {
        // Set new material
        if ( needsNewMesh( strMat ) )
        {
            createMesh();
        }
        m_pModel->m_pCurrentMesh->m_uiMaterialIndex = getMaterialIndex( strMat );
    }

    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
}

// -------------------------------------------------------------------
int ObjFileParser::getMaterialIndex( const std::string &strMaterialName )
{
    int mat_index = -1;
    if( strMaterialName.empty() ) {
        return mat_index;
    }
    for (size_t index = 0; index < m_pModel->m_MaterialLib.size(); ++index)
    {
        if ( strMaterialName == m_pModel->m_MaterialLib[ index ])
        {
            mat_index = (int)index;
            break;
        }
    }
    return mat_index;
}

// -------------------------------------------------------------------
//  Getter for a group name.
void ObjFileParser::getGroupName()
{
    std::string strGroupName;

    m_DataIt = getName<DataArrayIt>(m_DataIt, m_DataItEnd, strGroupName);
    if( isEndOfBuffer( m_DataIt, m_DataItEnd ) ) {
        return;
    }

    // Change active group, if necessary
    if ( m_pModel->m_strActiveGroup != strGroupName )
    {
        // Search for already existing entry
        ObjFile::Model::ConstGroupMapIt it = m_pModel->m_Groups.find(strGroupName);

        // We are mapping groups into the object structure
        createObject( strGroupName );

        // New group name, creating a new entry
        if (it == m_pModel->m_Groups.end())
        {
            std::vector<unsigned int> *pFaceIDArray = new std::vector<unsigned int>;
            m_pModel->m_Groups[ strGroupName ] = pFaceIDArray;
            m_pModel->m_pGroupFaceIDs = (pFaceIDArray);
        }
        else
        {
            m_pModel->m_pGroupFaceIDs = (*it).second;
        }
        m_pModel->m_strActiveGroup = strGroupName;
    }
    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
}

// -------------------------------------------------------------------
//  Not supported
void ObjFileParser::getGroupNumber()
{
    // Not used

    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
}

// -------------------------------------------------------------------
//  Not supported
void ObjFileParser::getGroupNumberAndResolution()
{
    // Not used

    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
}

// -------------------------------------------------------------------
//  Stores values for a new object instance, name will be used to
//  identify it.
void ObjFileParser::getObjectName()
{
    m_DataIt = getNextToken<DataArrayIt>(m_DataIt, m_DataItEnd);
    if( m_DataIt == m_DataItEnd ) {
        return;
    }
    char *pStart = &(*m_DataIt);
    while( m_DataIt != m_DataItEnd && !IsSpaceOrNewLine( *m_DataIt ) ) {
        ++m_DataIt;
    }

    std::string strObjectName(pStart, &(*m_DataIt));
    if (!strObjectName.empty())
    {
        // Reset current object
        m_pModel->m_pCurrent = NULL;

        // Search for actual object
        for (std::vector<ObjFile::Object*>::const_iterator it = m_pModel->m_Objects.begin();
            it != m_pModel->m_Objects.end();
            ++it)
        {
            if ((*it)->m_strObjName == strObjectName)
            {
                m_pModel->m_pCurrent = *it;
                break;
            }
        }

        // Allocate a new object, if current one was not found before
        if( NULL == m_pModel->m_pCurrent ) {
            createObject( strObjectName );
        }
    }
    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
}
// -------------------------------------------------------------------
//  Creates a new object instance
void ObjFileParser::createObject(const std::string &objName)
{
    ai_assert( NULL != m_pModel );

    m_pModel->m_pCurrent = new ObjFile::Object;
    m_pModel->m_pCurrent->m_strObjName = objName;
    m_pModel->m_Objects.push_back( m_pModel->m_pCurrent );

    createMesh();

    if( m_pModel->m_pCurrentMaterial )
    {
        m_pModel->m_pCurrentMesh->m_uiMaterialIndex =
            getMaterialIndex( m_pModel->m_pCurrentMaterial->MaterialName.data );
        m_pModel->m_pCurrentMesh->m_pMaterial = m_pModel->m_pCurrentMaterial;
    }
}
// -------------------------------------------------------------------
//  Creates a new mesh
void ObjFileParser::createMesh()
{
    ai_assert( NULL != m_pModel );
    m_pModel->m_pCurrentMesh = new ObjFile::Mesh;
    m_pModel->m_Meshes.push_back( m_pModel->m_pCurrentMesh );
    unsigned int meshId = m_pModel->m_Meshes.size()-1;
    if ( NULL != m_pModel->m_pCurrent )
    {
        m_pModel->m_pCurrent->m_Meshes.push_back( meshId );
    }
    else
    {
        DefaultLogger::get()->error("OBJ: No object detected to attach a new mesh instance.");
    }
}

// -------------------------------------------------------------------
//  Returns true, if a new mesh must be created.
bool ObjFileParser::needsNewMesh( const std::string &rMaterialName )
{
    if(m_pModel->m_pCurrentMesh == 0)
    {
        // No mesh data yet
        return true;
    }
    bool newMat = false;
    int matIdx = getMaterialIndex( rMaterialName );
    int curMatIdx = m_pModel->m_pCurrentMesh->m_uiMaterialIndex;
    if ( curMatIdx != int(ObjFile::Mesh::NoMaterial) || curMatIdx != matIdx )
    {
        // New material -> only one material per mesh, so we need to create a new
        // material
        newMat = true;
    }
    return newMat;
}

// -------------------------------------------------------------------
//  Shows an error in parsing process.
void ObjFileParser::reportErrorTokenInFace()
{
    m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
    DefaultLogger::get()->error("OBJ: Not supported token in face description detected");
}

// -------------------------------------------------------------------

}   // Namespace Assimp

#endif // !! ASSIMP_BUILD_NO_OBJ_IMPORTER