assimp.assimp/code/LWOLoader.cpp

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

Copyright (c) 2006-2008, ASSIMP Development 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 
conditions are met:

* 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 Development 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,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
---------------------------------------------------------------------------
*/

/** @file Implementation of the LWO importer class */

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

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

// 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()
{
}

// ------------------------------------------------------------------------------------------------
// 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;
}
// ------------------------------------------------------------------------------------------------
// Setup configuration properties
void LWOImporter::SetupProperties(const Importer* pImp)
{
	this->configGradientResX = pImp->GetProperty(AI_CONFIG_IMPORT_LWO_GRADIENT_RESX,512);
	this->configGradientResY = pImp->GetProperty(AI_CONFIG_IMPORT_LWO_GRADIENT_RESY,512);
}
// ------------------------------------------------------------------------------------------------
// 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;

	// create temporary storage on the stack but store points to
	// it in the class instance. Therefoe everything will be destructed
	// properly if an exception is thrown.
	PointList _mTempPoints;		
	mTempPoints = &_mTempPoints;
	FaceList _mFaces;			
	mFaces = &_mFaces;
	TagList _mTags;				
	mTags = &_mTags;
	TagMappingTable _mMapping;	
	mMapping = &_mMapping;
	SurfaceList _mSurfaces;		
	mSurfaces = &_mSurfaces;

	// old lightwave file format (prior to v6)
	if (AI_LWO_FOURCC_LWOB == fileType)
	{
		mIsLWO2 = false;
		this->LoadLWOBFile();
	}

	// new lightwave format
	else if (AI_LWO_FOURCC_LWO2 == fileType)
	{
		mIsLWO2 = true;
		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);
	}
	ResolveTags();

	// now sort all faces by the surfaces assigned to them
	typedef std::vector<unsigned int> SortedRep;
	std::vector<SortedRep> pSorted(mSurfaces->size()+1);

	unsigned int i = 0;
	unsigned int iDefaultSurface = 0xffffffff;
	for (FaceList::iterator it = mFaces->begin(), end = mFaces->end();
		it != end;++it,++i)
	{
		unsigned int idx = (*it).surfaceIndex;
		if (idx >= mTags->size())
		{
			DefaultLogger::get()->warn("LWO: Invalid face surface index");
			idx = mTags->size()-1;
		}
		if(0xffffffff == (idx = _mMapping[idx]))
		{
			if (0xffffffff == iDefaultSurface)
			{
				iDefaultSurface = mSurfaces->size();
				mSurfaces->push_back(LWO::Surface());
				LWO::Surface& surf = mSurfaces->back();
				surf.mColor.r = surf.mColor.g = surf.mColor.b = 0.6f; 
			}
			idx = iDefaultSurface;
		}
		pSorted[idx].push_back(i);
	}
	if (0xffffffff == iDefaultSurface)pSorted.erase(pSorted.end()-1);

	// 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();
		mesh->mMaxSmoothingAngle = AI_DEG_TO_RAD((*mSurfaces)[i].mMaximumSmoothAngle);

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

		aiVector3D* pv = mesh->mVertices = new aiVector3D[mesh->mNumVertices];
		aiFace* pf = 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)
			{
				*pv++ = _mTempPoints[face.mIndices[q]];
				face.mIndices[q] = vert++;
			}

			pf->mIndices = face.mIndices;
			pf->mNumIndices = face.mNumIndices;
			face.mIndices = NULL; // make sure it won't be deleted
			pf++;
		}

		// generate the corresponding material
		MaterialHelper* pcMat = new MaterialHelper();
		pScene->mMaterials[p] = pcMat;
		ConvertMaterial((*mSurfaces)[i],pcMat);
		++p;
	}

	// create a dummy nodegraph - the root node renders everything
	aiNode* p = pScene->mRootNode = new aiNode();
	p->mNumMeshes = pScene->mNumMeshes;
	p->mMeshes = new unsigned int[pScene->mNumMeshes];
	p->mName.Set("<LWORoot>");
	for (unsigned int i = 0; i < pScene->mNumMeshes;++i)
		p->mMeshes[i] = i;
}

// ------------------------------------------------------------------------------------------------
void LWOImporter::ConvertMaterial(const LWO::Surface& surf,MaterialHelper* pcMat)
{
	// copy the name of the surface
	aiString st;
	st.Set(surf.mName);
	pcMat->AddProperty(&st,AI_MATKEY_NAME);

	int i = surf.bDoubleSided ? 1 : 0;
	pcMat->AddProperty<int>(&i,1,AI_MATKEY_TWOSIDED);
	
	if (surf.mSpecularValue && surf.mGlossiness)
	{
		// this is only an assumption, needs to be confirmed.
		// the values have been tweaked by hand and seem to be correct.
		float fGloss;
		if (mIsLWO2)fGloss = surf.mGlossiness * 0.8f;
		else
		{
			if (16.0f >= surf.mGlossiness)fGloss = 6.0f;
			else if (64.0f >= surf.mGlossiness)fGloss = 20.0f;
			else if (256.0f >= surf.mGlossiness)fGloss = 50.0f;
			else fGloss = 80.0f;
		}

		pcMat->AddProperty<float>(&surf.mSpecularValue,1,AI_MATKEY_SHININESS_STRENGTH);
		pcMat->AddProperty<float>(&fGloss,1,AI_MATKEY_SHININESS);
	}

	// (the diffuse value is just a scaling factor)
	aiColor3D clr = surf.mColor;
	clr.r *= surf.mDiffuseValue;
	clr.g *= surf.mDiffuseValue;
	clr.b *= surf.mDiffuseValue;
	pcMat->AddProperty<aiColor3D>(&surf.mColor,1,AI_MATKEY_COLOR_DIFFUSE);

	// specular color
	clr.r = surf.mSpecularValue;
	clr.g = surf.mSpecularValue;
	clr.b = surf.mSpecularValue;
	pcMat->AddProperty<aiColor3D>(&surf.mColor,1,AI_MATKEY_COLOR_SPECULAR);

	// opacity
	float f = 1.0f-surf.mTransparency;
	pcMat->AddProperty<float>(&f,1,AI_MATKEY_OPACITY);

	// now handle all textures ...
	// TODO
}

// ------------------------------------------------------------------------------------------------
void LWOImporter::CountVertsAndFaces(unsigned int& verts, unsigned int& faces,
	LE_NCONST uint16_t*& cursor, const uint16_t* const end, unsigned int max)
{
	while (cursor < end && max--)
	{
		uint16_t numIndices = *cursor++;
		verts += numIndices;faces++;
		cursor += numIndices;
		int16_t surface = *cursor++;
		if (surface < 0)
		{
			// there are detail polygons
			numIndices = *cursor++;
			CountVertsAndFaces(verts,faces,cursor,end,numIndices);
		}
	}
}

// ------------------------------------------------------------------------------------------------
void LWOImporter::CopyFaceIndices(LWOImporter::FaceList::iterator& it,
	LE_NCONST uint16_t*& cursor, 
	const uint16_t* const end,
	unsigned int max)
{
	while (cursor < end && max--)
	{
		LWO::Face& face = *it;++it;
		if(face.mNumIndices = *cursor++)
		{
			if (cursor + face.mNumIndices >= end)break;
			face.mIndices = new unsigned int[face.mNumIndices];
			for (unsigned int i = 0; i < face.mNumIndices;++i)
			{
				face.mIndices[i] = *cursor++;
				if (face.mIndices[i] >= mTempPoints->size())
				{
					face.mIndices[i] = mTempPoints->size()-1;
					DefaultLogger::get()->warn("LWO: Face index is out of range");
				}
			}
		}
		else DefaultLogger::get()->warn("LWO: Face has 0 indices");
		int16_t surface = *cursor++;
		if (surface < 0)
		{
			surface = -surface;

			// there are detail polygons
			uint16_t numPolygons = *cursor++;
			if (cursor < end)CopyFaceIndices(it,cursor,end,numPolygons);
		}
		face.surfaceIndex = surface-1;
	}
}

// ------------------------------------------------------------------------------------------------
void LWOImporter::ResolveTags()
{
	mMapping->resize(mTags->size(),0xffffffff);
	for (unsigned int a = 0; a  < mTags->size();++a)
	{
		for (unsigned int i = 0; i < mSurfaces->size();++i)
		{
			const std::string& c = (*mTags)[a];
			const std::string& d = (*mSurfaces)[i].mName;
			if (!ASSIMP_stricmp(c,d))
			{
				(*mMapping)[a] = i;
				break;
			}
		}
	}
}

// ------------------------------------------------------------------------------------------------
void LWOImporter::ParseString(std::string& out,unsigned int max)
{
	unsigned int iCursor = 0;
	const char* in = (const char*)mFileBuffer,*sz = in;
	while (*in)
	{
		if (++iCursor > max)
		{
			DefaultLogger::get()->warn("LWOB: Invalid file, string is is too long");
			break;
		}
		++in;
	}
	unsigned int len = unsigned int (in-sz);
	out = std::string(sz,len);
}

// ------------------------------------------------------------------------------------------------
void LWOImporter::AdjustTexturePath(std::string& out)
{
	if (::strstr(out.c_str(), "(sequence)"))
	{
		// remove the (sequence) and append 000
		DefaultLogger::get()->info("LWO: Sequence of animated texture found. It will be ignored");
		out = out.substr(0,out.length()-10) + "000";
	}
}

// ------------------------------------------------------------------------------------------------
void LWOImporter::LoadLWOTags(unsigned int size)
{
	const char* szCur = (const char*)mFileBuffer, *szLast = szCur;
	const char* const szEnd = szLast+size;
	while (szCur < szEnd)
	{
		if (!(*szCur))
		{
			const unsigned int len = unsigned int(szCur-szLast);
			mTags->push_back(std::string(szLast,len));
			szCur += len & 1;
			szLast = szCur;
		}
		szCur++;
	}
}

// ------------------------------------------------------------------------------------------------
void LWOImporter::LoadLWOBFile()
{
	LE_NCONST uint8_t* const end = mFileBuffer + fileSize;
	while (true)
	{
		if (mFileBuffer + sizeof(IFF::ChunkHeader) > end)
			break;
		LE_NCONST IFF::ChunkHeader* const head = (LE_NCONST IFF::ChunkHeader*)mFileBuffer;
		AI_LSWAP4(head->length);
		AI_LSWAP4(head->type);
		mFileBuffer += sizeof(IFF::ChunkHeader);
		if (mFileBuffer + head->length > end)
		{
			throw new ImportErrorException("LWOB: Invalid file, the size attribute of "
				"a chunk points behind the end of the file");
			break;
		}
		LE_NCONST uint8_t* const next = mFileBuffer+head->length;
		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
				LE_NCONST uint16_t* const end	= (LE_NCONST uint16_t*)next;
				LE_NCONST uint16_t* cursor		= (LE_NCONST uint16_t*)mFileBuffer;

#ifndef AI_BUILD_BIG_ENDIAN
				while (cursor < end)ByteSwap::Swap2(cursor++);
				cursor = (LE_NCONST uint16_t*)mFileBuffer;
#endif

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

				// allocate the output array and copy face indices
				if (iNumFaces)
				{
					cursor = (LE_NCONST uint16_t*)mFileBuffer;
					this->mTempPoints->resize(iNumVertices);
					this->mFaces->resize(iNumFaces);
					FaceList::iterator it = this->mFaces->begin();
					CopyFaceIndices(it,cursor,end);
				}
				break;
			}
			// list of tags
		case AI_LWO_SRFS:
			{
				LoadLWOTags(head->length);
				break;
			}

			// surface chunk
		case AI_LWO_SURF:
			{
				LoadLWOBSurface(head->length);
				break;
			}
		}
		mFileBuffer = next;
	}
}
// ------------------------------------------------------------------------------------------------
void LWOImporter::LoadLWO2File()
{
}