assimp/code/LWOLoader.cpp

/*
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Open Asset Import Library (ASSIMP)
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/** @file Implementation of the LWO importer class */

// internal headers
#include "LWOLoader.h"
#include "MaterialSystem.h"
#include "ByteSwap.h"

// public assimp headers
#include "../include/IOStream.h"
#include "../include/IOSystem.h"
#include "../include/aiMesh.h"
#include "../include/aiScene.h"
#include "../include/aiAssert.h"
#include "../include/DefaultLogger.h"

// boost headers
#include <boost/scoped_ptr.hpp>

using namespace Assimp;


// ------------------------------------------------------------------------------------------------
// Constructor to be privately used by Importer
LWOImporter::LWOImporter()
{
}

// ------------------------------------------------------------------------------------------------
// Destructor, private as well 
LWOImporter::~LWOImporter()
{
	mFaces.clear();
	mTempPoints.clear();
	mSurfaces.clear();
}

// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file. 
bool LWOImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler) const
{
	// simple check of file extension is enough for the moment
	std::string::size_type pos = pFile.find_last_of('.');
	// no file extension - can't read
	if( pos == std::string::npos)return false;
	std::string extension = pFile.substr( pos);

	if (extension.length() < 4)return false;
	if (extension[0] != '.')return false;

	if (extension[1] != 'l' && extension[1] != 'L')return false;
	if (extension[2] != 'w' && extension[2] != 'W')return false;
	if (extension[3] != 'o' && extension[3] != 'O')return false;

	return true;
}
// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure. 
void LWOImporter::InternReadFile( const std::string& pFile, 
	aiScene* pScene, 
	IOSystem* pIOHandler)
{
	boost::scoped_ptr<IOStream> file( pIOHandler->Open( pFile, "rb"));

	// Check whether we can read from the file
	if( file.get() == NULL)
		throw new ImportErrorException( "Failed to open LWO file " + pFile + ".");

	if((this->fileSize = (unsigned int)file->FileSize()) < 12)
		throw new ImportErrorException("LWO: The file is too small to contain the IFF header");

	// allocate storage and copy the contents of the file to a memory buffer
	std::vector< uint8_t > mBuffer(fileSize);
	file->Read( &mBuffer[0], 1, fileSize);
	this->pScene = pScene;

	// determine the type of the file
	uint32_t fileType;
	const char* sz = IFF::ReadHeader(&mBuffer[0],fileType);
	if (sz)throw new ImportErrorException(sz);

	mFileBuffer = &mBuffer[0] + 12;
	fileSize -= 12;

	try 
	{
		// old lightwave file format (prior to v6)
		if (AI_LWO_FOURCC_LWOB == fileType)
			this->LoadLWOBFile();
		// new lightwave format
		else if (AI_LWO_FOURCC_LWO2 == fileType)
			this->LoadLWO2File();
		// we don't know this format
		else 
		{
			char szBuff[5];
			szBuff[0] = (char)(fileType >> 24u);
			szBuff[1] = (char)(fileType >> 16u);
			szBuff[2] = (char)(fileType >> 8u);
			szBuff[3] = (char)(fileType);
			throw new ImportErrorException(std::string("Unknown LWO sub format: ") + szBuff);
		}

		// generate a default surface if necessary
		if (mSurfaces.empty())
			mSurfaces.push_back(LWO::Surface());

		// now sort all faces by the surfaces assigned to them
		typedef std::vector<unsigned int> SortedRep;
		std::vector<SortedRep> pSorted(mSurfaces.size());

		unsigned int i = 0;
		for (FaceList::iterator it = mFaces.begin(), end = mFaces.end();
			it != end;++it,++i)
		{
			if ((*it).surfaceIndex >= mSurfaces.size())
			{
				DefaultLogger::get()->warn("LWO: Invalid face surface index");
				(*it).surfaceIndex = mSurfaces.size()-1;
			}
			pSorted[(*it).surfaceIndex].push_back(i);
		}

		// now generate output meshes
		for (unsigned int p = 0; p < mSurfaces.size();++p)
			if (!pSorted[p].empty())pScene->mNumMeshes++;

		if (!(pScene->mNumMaterials = pScene->mNumMeshes))
			throw new ImportErrorException("LWO: There are no meshes");

		pScene->mMeshes = new aiMesh*[pScene->mNumMeshes];
		pScene->mMaterials = new aiMaterial*[pScene->mNumMaterials];
		for (unsigned int p = 0,i = 0;i < mSurfaces.size();++i)
		{
			SortedRep& sorted = pSorted[i];
			if (sorted.empty())continue;

			// generate the mesh 
			aiMesh* mesh = pScene->mMeshes[p] = new aiMesh();
			mesh->mNumFaces = sorted.size();

			for (SortedRep::const_iterator it = sorted.begin(), end = sorted.end();
				it != end;++it)
			{
				mesh->mNumVertices += mFaces[*it].mNumIndices;
			}

			mesh->mVertices = new aiVector3D[mesh->mNumVertices];
			mesh->mFaces = new aiFace[mesh->mNumFaces];
			mesh->mMaterialIndex = p;

			// now convert all faces
			unsigned int vert = 0;
			for (SortedRep::const_iterator it = sorted.begin(), end = sorted.end();
				it != end;++it)
			{
				LWO::Face& face = mFaces[*it];

				// copy all vertices
				for (unsigned int q = 0; q  < face.mNumIndices;++q)
				{
					*mesh->mVertices++ = mTempPoints[face.mIndices[q]];
					face.mIndices[q] = vert++;
				}

				mesh->mFaces->mIndices = face.mIndices;
				mesh->mFaces->mNumIndices = face.mNumIndices;
				face.mIndices = NULL; // make sure it won't be deleted

				mesh->mFaces++;
			}
			mesh->mFaces -= mesh->mNumFaces;
			mesh->mVertices -= mesh->mNumVertices;

			// generate the corresponding material
			MaterialHelper* pcMat = new MaterialHelper();
			pScene->mMaterials[p] = pcMat;

			// todo

			++p;
		}
	}
	// make sure the arrays are cleaned up ...
	catch (ImportErrorException* ex)
	{
		this->~LWOImporter();
		throw ex;
	}
	this->~LWOImporter();
}
// ------------------------------------------------------------------------------------------------
void LWOImporter::CountVertsAndFaces(unsigned int& verts, unsigned int& faces,
	LE_NCONST uint8_t*& cursor, const uint8_t* const end, unsigned int max)
{
	while (cursor < end && max--)
	{
		uint16_t numIndices = *((uint16_t*)cursor);cursor+=2;
		verts += numIndices;faces++;
		cursor += numIndices*2;
		int16_t surface = *((uint16_t*)cursor);cursor+=2;
		if (surface < 0)
		{
			// there are detail polygons
			numIndices = *((uint16_t*)cursor);cursor+=2;
			CountVertsAndFaces(verts,faces,cursor,end,numIndices);
		}
	}
}
// ------------------------------------------------------------------------------------------------
void LWOImporter::CopyFaceIndices(LWOImporter::FaceList::iterator& it,LE_NCONST uint8_t*& cursor, 
	const uint8_t* const end, unsigned int max)
{
	while (cursor < end && max--)
	{
		LWO::Face& face = *it;++it;
		face.mNumIndices = *((uint16_t*)cursor);
		if (cursor + face.mNumIndices*2 + 4 >= end)break;
		face.mIndices = new unsigned int[face.mNumIndices];
		for (unsigned int i = 0; i < face.mNumIndices;++i)
		{
			face.mIndices[i] = *((uint16_t*)(cursor+=2));
			if (face.mIndices[i] >= mTempPoints.size())
			{
				face.mIndices[i] = mTempPoints.size()-1;
				DefaultLogger::get()->warn("LWO: Face index is out of range");
			}
		}
		cursor+=2;
		int16_t surface = *((uint16_t*)cursor);cursor+=2;
		if (surface < 0)
		{
			surface *= -1;

			// there are detail polygons
			uint16_t numPolygons = *((uint16_t*)cursor);cursor+=2;
			if (cursor < end)CopyFaceIndices(it,cursor,end,numPolygons);
		}
		face.surfaceIndex = surface-1;
	}
}
// ------------------------------------------------------------------------------------------------
void LWOImporter::LoadLWOBSurface(unsigned int size)
{
	uint32_t iCursor = 0;
	mSurfaces.push_back( LWO::Surface () );
	LWO::Surface& surf = mSurfaces.back();
	LWO::Texture* pTex = NULL;

	// at first we'll need to read the name of the surface
	const uint8_t* sz = mFileBuffer;
	while (*mFileBuffer)
	{
		if (++iCursor > size)throw new ImportErrorException("LWOB: Invalid file, surface name is too long");
		++mFileBuffer;
	}
	unsigned int len = unsigned int (mFileBuffer-sz);
	surf.mName = std::string((const char*)sz,len);
	mFileBuffer += 1-(len & 1); // skip one byte if the length of the string is odd
	while (true)
	{
		if ((iCursor += sizeof(IFF::ChunkHeader)) > size)break;
		LE_NCONST IFF::ChunkHeader* head = (LE_NCONST IFF::ChunkHeader*)mFileBuffer;
		AI_LSWAP4(head->length);
		AI_LSWAP4(head->type);
		if ((iCursor += head->length) > size)
		{
			throw new ImportErrorException("LWOB: Invalid file, the size attribute of "
				"a surface sub chunk points behind the end of the file");
		}
		mFileBuffer += sizeof(IFF::ChunkHeader);
		switch (head->type)
		{
			// diffuse color
		case AI_LWO_COLR:
			{
				if (head->length < 3)
				{
					DefaultLogger::get()->warn("LWO: COLR chunk is expected to be at least 3 bytes in size");
					break;
				}
				surf.mColor.r = *mFileBuffer++ / 255.0f;
				surf.mColor.g = *mFileBuffer++ / 255.0f;
				surf.mColor.b = *mFileBuffer   / 255.0f;
				break;
			}
			// diffuse strength ... hopefully
		case AI_LWO_DIFF:
			{
				AI_LSWAP2(mFileBuffer);
				surf.mDiffuseValue = *((int16_t*)mFileBuffer) / 255.0f;
				break;
			}
			// specular strength ... hopefully
		case AI_LWO_SPEC:
			{
				AI_LSWAP2(mFileBuffer);
				surf.mSpecularValue = *((int16_t*)mFileBuffer) / 255.0f;
				break;
			}
		// transparency
		case AI_LWO_TRAN:
			{
				AI_LSWAP2(mFileBuffer);
				surf.mTransparency = *((int16_t*)mFileBuffer) / 255.0f;
				break;
			}
		// glossiness
		case AI_LWO_GLOS:
			{
				AI_LSWAP2(mFileBuffer);
				surf.mGlossiness = float(*((int16_t*)mFileBuffer));
				break;
			}
		// color texture
		case AI_LWO_CTEX:
			{
				pTex = &surf.mColorTexture;
				break;
			}
		// diffuse texture
		case AI_LWO_DTEX:
			{
				pTex = &surf.mDiffuseTexture;
				break;
			}
		// specular texture
		case AI_LWO_STEX:
			{
				pTex = &surf.mSpecularTexture;
				break;
			}
		// bump texture
		case AI_LWO_BTEX:
			{
				pTex = &surf.mBumpTexture;
				break;
			}
		// transparency texture
		case AI_LWO_TTEX:
			{
				pTex = &surf.mTransparencyTexture;
				break;
			}
			// texture path
		case AI_LWO_TIMG:
			{
				if (pTex)
				{
					unsigned int iCursor = 0;
					while (*mFileBuffer)
					{
						if (++iCursor > head->length)
						{
							DefaultLogger::get()->warn("LWOB: Invalid file, texture name (TIMG) is too long");
							break;
						}
						++mFileBuffer;
					}
					unsigned int len = unsigned int (mFileBuffer-sz);
					pTex->mFileName = std::string((const char*)sz,len);
				}
				else DefaultLogger::get()->warn("LWOB: TIMG tag was encuntered although "
					"there was no xTEX tag before");
				break;
			}
		// texture strength
		case AI_LWO_TVAL:
			{
				if (pTex)pTex->mStrength = *mFileBuffer / 255.0f;
				else DefaultLogger::get()->warn("LWOB: TVAL tag was encuntered "
					"although there was no xTEX tag before");
				break;
			}
		}
		mFileBuffer += head->length;
	}
}
// ------------------------------------------------------------------------------------------------
void LWOImporter::LoadLWOBFile()
{
	uint32_t iCursor = 0;
	while (true)
	{
		if ((iCursor += sizeof(IFF::ChunkHeader)) > this->fileSize)break;
		LE_NCONST IFF::ChunkHeader* head = (LE_NCONST IFF::ChunkHeader*)mFileBuffer;
		AI_LSWAP4(head->length);
		AI_LSWAP4(head->type);
		if ((iCursor += head->length) > this->fileSize)
		{
			//throw new ImportErrorException("LWOB: Invalid file, the size attribute of "
			//	"a chunk points behind the end of the file");
			break;
		}
		mFileBuffer += sizeof(IFF::ChunkHeader);
		switch (head->type)
		{
			// vertex list
		case AI_LWO_PNTS:
			{
				mTempPoints.resize( head->length / 12 );
#ifndef AI_BUILD_BIG_ENDIAN
				for (unsigned int i = 0; i < head->length>>2;++i)
					ByteSwap::Swap4( mFileBuffer + (i << 2));
#endif
				::memcpy(&mTempPoints[0],mFileBuffer,head->length);
				break;
			}
			// face list
		case AI_LWO_POLS:
			{
				// first find out how many faces and vertices we'll finally need
				const uint8_t* const end = mFileBuffer + head->length;
				LE_NCONST uint8_t* cursor = mFileBuffer;

#ifndef AI_BUILD_BIG_ENDIAN
				while (cursor < end)ByteSwap::Swap2(cursor++);
				cursor = mFileBuffer;
#endif

				unsigned int iNumFaces = 0,iNumVertices = 0;
				CountVertsAndFaces(iNumVertices,iNumFaces,cursor,end);

				// allocate the output array and copy face indices
				if (iNumFaces)
				{
					this->mTempPoints.resize(iNumVertices);
					this->mFaces.resize(iNumFaces);
					FaceList::iterator it = this->mFaces.begin();
					CopyFaceIndices(it,mFileBuffer,end);
				}
				break;
			}
			// surface chunk
		case AI_LWO_SURF:
			{
				LoadLWOBSurface(head->length);
				break;
			}
		}
		mFileBuffer += head->length;
	}
}
// ------------------------------------------------------------------------------------------------
void LWOImporter::LoadLWO2File()
{
}