assimp/code/AssetLib/Q3BSP/Q3BSPFileParser.cpp

/*
Open Asset Import Library (assimp)
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  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
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  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_Q3BSP_IMPORTER

#include "Q3BSPFileParser.h"
#include "Q3BSPFileData.h"
#include <vector>
#include <assimp/DefaultIOSystem.h>
#include <assimp/ZipArchiveIOSystem.h>
#include <assimp/ai_assert.h>

namespace Assimp {

using namespace Q3BSP;

// ------------------------------------------------------------------------------------------------
Q3BSPFileParser::Q3BSPFileParser( const std::string &mapName, ZipArchiveIOSystem *pZipArchive ) :
    m_sOffset( 0 ),
    m_Data(),
    m_pModel(nullptr),
    m_pZipArchive( pZipArchive )
{
    ai_assert(nullptr != m_pZipArchive );
    ai_assert( !mapName.empty() );

    if ( !readData( mapName ) )
        return;

    m_pModel = new Q3BSPModel;
    m_pModel->m_ModelName = mapName;
    if ( !parseFile() ) {
        delete m_pModel;
        m_pModel = nullptr;
    }
}

// ------------------------------------------------------------------------------------------------
Q3BSPFileParser::~Q3BSPFileParser() {
    delete m_pModel;
}

// ------------------------------------------------------------------------------------------------
Q3BSP::Q3BSPModel *Q3BSPFileParser::getModel() const {
    return m_pModel;
}

// ------------------------------------------------------------------------------------------------
bool Q3BSPFileParser::readData( const std::string &rMapName ) {
    if ( !m_pZipArchive->Exists( rMapName.c_str() ) )
        return false;

    IOStream *pMapFile = m_pZipArchive->Open( rMapName.c_str() );
    if ( nullptr == pMapFile )
        return false;

    const size_t size = pMapFile->FileSize();
    m_Data.resize( size );

    const size_t readSize = pMapFile->Read( &m_Data[0], sizeof( char ), size );
    if ( readSize != size ) {
        m_Data.clear();
        m_pZipArchive->Close(pMapFile);
        return false;
    }
    m_pZipArchive->Close( pMapFile );

    return true;
}

// ------------------------------------------------------------------------------------------------
bool Q3BSPFileParser::parseFile() {
    if ( m_Data.empty() ) {
        return false;
    }

    if ( !validateFormat() )
    {
        return false;
    }

    // Imports the dictionary of the level
    getLumps();

    // Count data and prepare model data
    countLumps();

    // Read in Vertices
    getVertices();

    // Read in Indices
    getIndices();

    // Read Faces
    getFaces();

    // Read Textures
    getTextures();

    // Read Lightmaps
    getLightMaps();

    // Load the entities
    getEntities();

    return true;
}

// ------------------------------------------------------------------------------------------------
bool Q3BSPFileParser::validateFormat()
{
    sQ3BSPHeader *pHeader = (sQ3BSPHeader*) &m_Data[ 0 ];
    m_sOffset += sizeof( sQ3BSPHeader );

    // Version and identify string validation
    if (pHeader->strID[ 0 ] != 'I' || pHeader->strID[ 1 ] != 'B' || pHeader->strID[ 2 ] != 'S'
        || pHeader->strID[ 3 ] != 'P')
    {
        return false;
    }

    return true;
}

// ------------------------------------------------------------------------------------------------
void Q3BSPFileParser::getLumps()
{
    size_t Offset = m_sOffset;
    m_pModel->m_Lumps.resize( kMaxLumps );
    for ( size_t idx=0; idx < kMaxLumps; idx++ )
    {
        sQ3BSPLump *pLump = new sQ3BSPLump;
        memcpy( pLump, &m_Data[ Offset ], sizeof( sQ3BSPLump ) );
        Offset += sizeof( sQ3BSPLump );
        m_pModel->m_Lumps[ idx ] = pLump;
    }
}

// ------------------------------------------------------------------------------------------------
void Q3BSPFileParser::countLumps()
{
    m_pModel->m_Vertices.resize( m_pModel->m_Lumps[ kVertices ]->iSize / sizeof( sQ3BSPVertex ) );
    m_pModel->m_Indices.resize( m_pModel->m_Lumps[ kMeshVerts ]->iSize  / sizeof( int ) );
    m_pModel->m_Faces.resize( m_pModel->m_Lumps[ kFaces ]->iSize / sizeof( sQ3BSPFace ) );
    m_pModel->m_Textures.resize( m_pModel->m_Lumps[ kTextures ]->iSize / sizeof( sQ3BSPTexture ) );
    m_pModel->m_Lightmaps.resize( m_pModel->m_Lumps[ kLightmaps ]->iSize / sizeof( sQ3BSPLightmap ) );
}

// ------------------------------------------------------------------------------------------------
void Q3BSPFileParser::getVertices()
{
    size_t Offset = m_pModel->m_Lumps[ kVertices ]->iOffset;
    for ( size_t idx = 0; idx < m_pModel->m_Vertices.size(); idx++ )
    {
        sQ3BSPVertex *pVertex = new sQ3BSPVertex;
        memcpy( pVertex, &m_Data[ Offset ], sizeof( sQ3BSPVertex ) );
        Offset += sizeof( sQ3BSPVertex );
        m_pModel->m_Vertices[ idx ] = pVertex;
    }
}

// ------------------------------------------------------------------------------------------------
void Q3BSPFileParser::getIndices()
{
    ai_assert(nullptr != m_pModel );

    sQ3BSPLump *lump = m_pModel->m_Lumps[ kMeshVerts ];
    size_t Offset = (size_t) lump->iOffset;
    const size_t nIndices = lump->iSize / sizeof( int );
    m_pModel->m_Indices.resize( nIndices );
    memcpy( &m_pModel->m_Indices[ 0 ], &m_Data[ Offset ], lump->iSize );
}

// ------------------------------------------------------------------------------------------------
void Q3BSPFileParser::getFaces()
{
    ai_assert(nullptr != m_pModel );

    size_t Offset = m_pModel->m_Lumps[ kFaces ]->iOffset;
    for ( size_t idx = 0; idx < m_pModel->m_Faces.size(); idx++ )
    {
        sQ3BSPFace *pFace = new sQ3BSPFace;
        memcpy( pFace, &m_Data[ Offset ], sizeof( sQ3BSPFace ) );
        m_pModel->m_Faces[ idx ] = pFace;
        Offset += sizeof( sQ3BSPFace );
    }
}

// ------------------------------------------------------------------------------------------------
void Q3BSPFileParser::getTextures()
{
    ai_assert(nullptr != m_pModel );

    size_t Offset = m_pModel->m_Lumps[ kTextures ]->iOffset;
    for ( size_t idx=0; idx < m_pModel->m_Textures.size(); idx++ )
    {
        sQ3BSPTexture *pTexture = new sQ3BSPTexture;
        memcpy( pTexture, &m_Data[ Offset ], sizeof(sQ3BSPTexture) );
        m_pModel->m_Textures[ idx ] = pTexture;
        Offset += sizeof(sQ3BSPTexture);
    }
}

// ------------------------------------------------------------------------------------------------
void Q3BSPFileParser::getLightMaps()
{
    ai_assert(nullptr != m_pModel );

    size_t Offset = m_pModel->m_Lumps[kLightmaps]->iOffset;
    for ( size_t idx=0; idx < m_pModel->m_Lightmaps.size(); idx++ )
    {
        sQ3BSPLightmap *pLightmap = new sQ3BSPLightmap;
        memcpy( pLightmap, &m_Data[ Offset ], sizeof( sQ3BSPLightmap ) );
        Offset += sizeof( sQ3BSPLightmap );
        m_pModel->m_Lightmaps[ idx ] = pLightmap;
    }
}

// ------------------------------------------------------------------------------------------------
void Q3BSPFileParser::getEntities() {
    const int size = m_pModel->m_Lumps[ kEntities ]->iSize;
    m_pModel->m_EntityData.resize( size );
    if ( size > 0 ) {
        size_t Offset = m_pModel->m_Lumps[ kEntities ]->iOffset;
        memcpy( &m_pModel->m_EntityData[ 0 ], &m_Data[ Offset ], sizeof( char ) * size );
    }
}

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

} // Namespace Assimp

#endif // ASSIMP_BUILD_NO_Q3BSP_IMPORTER