AtomicGameEngine/Source/ThirdParty/Assimp/code/ObjFileParser.cpp

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

Copyright (c) 2006-2015, assimp team

All rights reserved.

Redistribution and use of this software in source and binary forms,
with or without modification, are permitted provided that the following
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* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
  materials provided with the distribution.

* Neither the name of the assimp team, nor the names of its
  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the assimp team.

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
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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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 "../include/assimp/types.h"
#include "DefaultIOSystem.h"
#include "BaseImporter.h"
#include "../include/assimp/DefaultLogger.hpp"
#include "../include/assimp/material.h"
#include "../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");
        m_DataIt = skipLine<DataArrayIt>( m_DataIt, m_DataItEnd, m_uiLine );
        delete pTexID;
        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 &strObjectName)
{
    ai_assert( NULL != m_pModel );
    //ai_assert( !strObjectName.empty() );

    m_pModel->m_pCurrent = new ObjFile::Object;
    m_pModel->m_pCurrent->m_strObjName = strObjectName;
    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