assimp.assimp/code/MDLLoader.cpp

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

Copyright (c) 2006-2010, 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 
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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
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  derived from this software without specific prior
  written permission of the ASSIMP Development Team.

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*/

/** @file MDLLoader.cpp
 *  @brief Implementation of the main parts of the MDL importer class
 *  *TODO* Cleanup and further testing of some parts necessary
 */

// internal headers
#include "AssimpPCH.h"
#ifndef ASSIMP_BUILD_NO_MDL_IMPORTER

#include "MDLLoader.h"
#include "MDLDefaultColorMap.h"
#include "MD2FileData.h" 

using namespace Assimp;

// ------------------------------------------------------------------------------------------------
// Ugly stuff ... nevermind
#define _AI_MDL7_ACCESS(_data, _index, _limit, _type)				\
	(*((const _type*)(((const char*)_data) + _index * _limit)))

#define _AI_MDL7_ACCESS_PTR(_data, _index, _limit, _type)			\
	((BE_NCONST _type*)(((const char*)_data) + _index * _limit))

#define _AI_MDL7_ACCESS_VERT(_data, _index, _limit)					\
	_AI_MDL7_ACCESS(_data,_index,_limit,MDL::Vertex_MDL7)

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

// ------------------------------------------------------------------------------------------------
// Destructor, private as well 
MDLImporter::~MDLImporter()
{}

// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file. 
bool MDLImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler, bool checkSig) const
{
	const std::string extension = GetExtension(pFile);

	// if check for extension is not enough, check for the magic tokens 
	if (extension == "mdl"  || !extension.length() || checkSig) {
		uint32_t tokens[8]; 
		tokens[0] = AI_MDL_MAGIC_NUMBER_LE_HL2a;
		tokens[1] = AI_MDL_MAGIC_NUMBER_LE_HL2b;
		tokens[2] = AI_MDL_MAGIC_NUMBER_LE_GS7;
		tokens[3] = AI_MDL_MAGIC_NUMBER_LE_GS5b;
		tokens[4] = AI_MDL_MAGIC_NUMBER_LE_GS5a;
		tokens[5] = AI_MDL_MAGIC_NUMBER_LE_GS4;
		tokens[6] = AI_MDL_MAGIC_NUMBER_LE_GS3;
		tokens[7] = AI_MDL_MAGIC_NUMBER_LE;
		return CheckMagicToken(pIOHandler,pFile,tokens,8,0);
	}
	return false;
}

// ------------------------------------------------------------------------------------------------
// Setup configuration properties
void MDLImporter::SetupProperties(const Importer* pImp)
{
	configFrameID = pImp->GetPropertyInteger(AI_CONFIG_IMPORT_MDL_KEYFRAME,-1);

	// The 
	// AI_CONFIG_IMPORT_MDL_KEYFRAME option overrides the
	// AI_CONFIG_IMPORT_GLOBAL_KEYFRAME option.
	if(static_cast<unsigned int>(-1) == configFrameID)	{
		configFrameID =  pImp->GetPropertyInteger(AI_CONFIG_IMPORT_GLOBAL_KEYFRAME,0);
	}

	// AI_CONFIG_IMPORT_MDL_COLORMAP - pallette file
	configPalette =  pImp->GetPropertyString(AI_CONFIG_IMPORT_MDL_COLORMAP,"colormap.lmp");
}

// ------------------------------------------------------------------------------------------------
// Get a list of all supported extensions
void MDLImporter::GetExtensionList(std::set<std::string>& extensions)
{
	extensions.insert( "mdl" );
}

// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure. 
void MDLImporter::InternReadFile( const std::string& pFile, 
	aiScene* _pScene, IOSystem* _pIOHandler)
{
	pScene     = _pScene;
	pIOHandler = _pIOHandler;
	boost::scoped_ptr<IOStream> file( pIOHandler->Open( pFile));

	// Check whether we can read from the file
	if( file.get() == NULL) {
		throw DeadlyImportError( "Failed to open MDL file " + pFile + ".");
	}

	// This should work for all other types of MDL files, too ...
	// the quake header is one of the smallest, afaik
	iFileSize = (unsigned int)file->FileSize();
	if( iFileSize < sizeof(MDL::Header)) {
		throw DeadlyImportError( "MDL File is too small.");
	}

	// Allocate storage and copy the contents of the file to a memory buffer
	std::vector<unsigned char> buffer(iFileSize+1);
	mBuffer = &buffer[0];
	file->Read( (void*)mBuffer, 1, iFileSize);

	// Append a binary zero to the end of the buffer.
	// this is just for safety that string parsing routines
	// find the end of the buffer ...
	mBuffer[iFileSize] = '\0';
	const uint32_t iMagicWord = *((uint32_t*)mBuffer);

	// Determine the file subtype and call the appropriate member function

	// Original Quake1 format
	if (AI_MDL_MAGIC_NUMBER_BE == iMagicWord ||	AI_MDL_MAGIC_NUMBER_LE == iMagicWord)	{
		DefaultLogger::get()->debug("MDL subtype: Quake 1, magic word is IDPO");
		iGSFileVersion = 0;
		InternReadFile_Quake1();
	}
	// GameStudio A<old> MDL2 format - used by some test models that come with 3DGS
	else if (AI_MDL_MAGIC_NUMBER_BE_GS3 == iMagicWord || AI_MDL_MAGIC_NUMBER_LE_GS3 == iMagicWord)	{
		DefaultLogger::get()->debug("MDL subtype: 3D GameStudio A2, magic word is MDL2");
		iGSFileVersion = 2;
		InternReadFile_Quake1();
	}
	// GameStudio A4 MDL3 format
	else if (AI_MDL_MAGIC_NUMBER_BE_GS4 == iMagicWord || AI_MDL_MAGIC_NUMBER_LE_GS4 == iMagicWord)	{
		DefaultLogger::get()->debug("MDL subtype: 3D GameStudio A4, magic word is MDL3");
		iGSFileVersion = 3;
		InternReadFile_3DGS_MDL345();
	}
	// GameStudio A5+ MDL4 format
	else if (AI_MDL_MAGIC_NUMBER_BE_GS5a == iMagicWord || AI_MDL_MAGIC_NUMBER_LE_GS5a == iMagicWord)	{
		DefaultLogger::get()->debug("MDL subtype: 3D GameStudio A4, magic word is MDL4");
		iGSFileVersion = 4;
		InternReadFile_3DGS_MDL345();
	}
	// GameStudio A5+ MDL5 format
	else if (AI_MDL_MAGIC_NUMBER_BE_GS5b == iMagicWord || AI_MDL_MAGIC_NUMBER_LE_GS5b == iMagicWord)	{
		DefaultLogger::get()->debug("MDL subtype: 3D GameStudio A5, magic word is MDL5");
		iGSFileVersion = 5;
		InternReadFile_3DGS_MDL345();
	}
	// GameStudio A7 MDL7 format
	else if (AI_MDL_MAGIC_NUMBER_BE_GS7 == iMagicWord || AI_MDL_MAGIC_NUMBER_LE_GS7 == iMagicWord)	{
		DefaultLogger::get()->debug("MDL subtype: 3D GameStudio A7, magic word is MDL7");
		iGSFileVersion = 7;
		InternReadFile_3DGS_MDL7();
	}
	// IDST/IDSQ Format (CS:S/HL², etc ...)
	else if (AI_MDL_MAGIC_NUMBER_BE_HL2a == iMagicWord || AI_MDL_MAGIC_NUMBER_LE_HL2a == iMagicWord ||
		AI_MDL_MAGIC_NUMBER_BE_HL2b == iMagicWord || AI_MDL_MAGIC_NUMBER_LE_HL2b == iMagicWord)
	{
		DefaultLogger::get()->debug("MDL subtype: Source(tm) Engine, magic word is IDST/IDSQ");
		iGSFileVersion = 0;
		InternReadFile_HL2();
	}
	else	{
		// print the magic word to the log file
		throw DeadlyImportError( "Unknown MDL subformat " + pFile +
			". Magic word (" + std::string((char*)&iMagicWord,4) + ") is not known");
	}

	// Now rotate the whole scene 90 degrees around the x axis to convert to internal coordinate system
	pScene->mRootNode->mTransformation = aiMatrix4x4(1.f,0.f,0.f,0.f,
		0.f,0.f,1.f,0.f,0.f,-1.f,0.f,0.f,0.f,0.f,0.f,1.f);

	// delete the file buffer and cleanup
	AI_DEBUG_INVALIDATE_PTR(mBuffer);
	AI_DEBUG_INVALIDATE_PTR(pIOHandler);
	AI_DEBUG_INVALIDATE_PTR(pScene);
}

// ------------------------------------------------------------------------------------------------
// Check whether we're still inside the valid file range
void MDLImporter::SizeCheck(const void* szPos)
{
	if (!szPos || (const unsigned char*)szPos > this->mBuffer + this->iFileSize)
	{
		throw DeadlyImportError("Invalid MDL file. The file is too small "
			"or contains invalid data.");
	}
}

// ------------------------------------------------------------------------------------------------
// Just for debgging purposes
void MDLImporter::SizeCheck(const void* szPos, const char* szFile, unsigned int iLine)
{
	ai_assert(NULL != szFile);
	if (!szPos || (const unsigned char*)szPos > mBuffer + iFileSize)
	{
		// remove a directory if there is one
		const char* szFilePtr = ::strrchr(szFile,'\\');
		if (!szFilePtr)	{
			if(!(szFilePtr = ::strrchr(szFile,'/')))
				szFilePtr = szFile;
		}
		if (szFilePtr)++szFilePtr;

		char szBuffer[1024];
		::sprintf(szBuffer,"Invalid MDL file. The file is too small "
			"or contains invalid data (File: %s Line: %i)",szFilePtr,iLine);

		throw DeadlyImportError(szBuffer);
	}
}

// ------------------------------------------------------------------------------------------------
// Validate a quake file header
void MDLImporter::ValidateHeader_Quake1(const MDL::Header* pcHeader)
{
	// some values may not be NULL
	if (!pcHeader->num_frames)
		throw DeadlyImportError( "[Quake 1 MDL] There are no frames in the file");

	if (!pcHeader->num_verts)
		throw DeadlyImportError( "[Quake 1 MDL] There are no vertices in the file");

	if (!pcHeader->num_tris)
		throw DeadlyImportError( "[Quake 1 MDL] There are no triangles in the file");

	// check whether the maxima are exceeded ...however, this applies for Quake 1 MDLs only
	if (!this->iGSFileVersion)
	{
		if (pcHeader->num_verts > AI_MDL_MAX_VERTS)
			DefaultLogger::get()->warn("Quake 1 MDL model has more than AI_MDL_MAX_VERTS vertices");

		if (pcHeader->num_tris > AI_MDL_MAX_TRIANGLES)
			DefaultLogger::get()->warn("Quake 1 MDL model has more than AI_MDL_MAX_TRIANGLES triangles");

		if (pcHeader->num_frames > AI_MDL_MAX_FRAMES)
			DefaultLogger::get()->warn("Quake 1 MDL model has more than AI_MDL_MAX_FRAMES frames");

		// (this does not apply for 3DGS MDLs)
		if (!this->iGSFileVersion && pcHeader->version != AI_MDL_VERSION)
			DefaultLogger::get()->warn("Quake 1 MDL model has an unknown version: AI_MDL_VERSION (=6) is "
				"the expected file format version");
		if(pcHeader->num_skins && (!pcHeader->skinwidth || !pcHeader->skinheight))
			DefaultLogger::get()->warn("Skin width or height are 0");
	}
}

#ifdef AI_BUILD_BIG_ENDIAN
// ------------------------------------------------------------------------------------------------
void FlipQuakeHeader(BE_NCONST MDL::Header* pcHeader)
{
	AI_SWAP4( pcHeader->ident);
	AI_SWAP4( pcHeader->version);
	AI_SWAP4( pcHeader->boundingradius);
	AI_SWAP4( pcHeader->flags);
	AI_SWAP4( pcHeader->num_frames);
	AI_SWAP4( pcHeader->num_skins);
	AI_SWAP4( pcHeader->num_tris);
	AI_SWAP4( pcHeader->num_verts);
	for (unsigned int i = 0; i < 3;++i)
	{
		AI_SWAP4( pcHeader->scale[i]);
		AI_SWAP4( pcHeader->translate[i]);
	}
	AI_SWAP4( pcHeader->size);
	AI_SWAP4( pcHeader->skinheight);
	AI_SWAP4( pcHeader->skinwidth); 
	AI_SWAP4( pcHeader->synctype); 
}
#endif

// ------------------------------------------------------------------------------------------------
// Read a Quake 1 file
void MDLImporter::InternReadFile_Quake1( )
{
	ai_assert(NULL != pScene);
	BE_NCONST MDL::Header *pcHeader = (BE_NCONST MDL::Header*)this->mBuffer;

#ifdef AI_BUILD_BIG_ENDIAN
	FlipQuakeHeader(pcHeader);
#endif

	ValidateHeader_Quake1(pcHeader);

	// current cursor position in the file
	const unsigned char* szCurrent = (const unsigned char*)(pcHeader+1);

	// need to read all textures
	for (unsigned int i = 0; i < (unsigned int)pcHeader->num_skins;++i)
	{
		union{BE_NCONST MDL::Skin* pcSkin;BE_NCONST MDL::GroupSkin* pcGroupSkin;};
		pcSkin = (BE_NCONST MDL::Skin*)szCurrent;

		AI_SWAP4( pcSkin->group );

		// Quake 1 groupskins
		if (1 == pcSkin->group)
		{
			AI_SWAP4( pcGroupSkin->nb );

			// need to skip multiple images
			const unsigned int iNumImages = (unsigned int)pcGroupSkin->nb;
			szCurrent += sizeof(uint32_t) * 2;

			if (0 != iNumImages)	
			{
				if (!i) {
					// however, create only one output image (the first)
					this->CreateTextureARGB8_3DGS_MDL3(szCurrent + iNumImages * sizeof(float));
				}
				// go to the end of the skin section / the beginning of the next skin
				szCurrent += pcHeader->skinheight * pcHeader->skinwidth +
					sizeof(float) * iNumImages;
			}
		}
		// 3DGS has a few files that are using other 3DGS like texture formats here
		else
		{
			szCurrent += sizeof(uint32_t);
			unsigned int iSkip = i ? UINT_MAX : 0;
			CreateTexture_3DGS_MDL4(szCurrent,pcSkin->group,&iSkip);
			szCurrent += iSkip;
		}
	}
	// get a pointer to the texture coordinates
	BE_NCONST MDL::TexCoord* pcTexCoords = (BE_NCONST MDL::TexCoord*)szCurrent;
	szCurrent += sizeof(MDL::TexCoord) * pcHeader->num_verts;

	// get a pointer to the triangles
	BE_NCONST MDL::Triangle* pcTriangles = (BE_NCONST MDL::Triangle*)szCurrent;
	szCurrent += sizeof(MDL::Triangle) * pcHeader->num_tris;
	VALIDATE_FILE_SIZE(szCurrent);

	// now get a pointer to the first frame in the file
	BE_NCONST MDL::Frame* pcFrames = (BE_NCONST MDL::Frame*)szCurrent;
	BE_NCONST MDL::SimpleFrame* pcFirstFrame;

	if (0 == pcFrames->type)
	{
		// get address of single frame
		pcFirstFrame = &pcFrames->frame;
	}
	else
	{
		// get the first frame in the group
		BE_NCONST MDL::GroupFrame* pcFrames2 = (BE_NCONST MDL::GroupFrame*)pcFrames;
		pcFirstFrame = (BE_NCONST MDL::SimpleFrame*)(&pcFrames2->time + pcFrames->type);
	}
	BE_NCONST MDL::Vertex* pcVertices = (BE_NCONST MDL::Vertex*) ((pcFirstFrame->name) + sizeof(pcFirstFrame->name));
	VALIDATE_FILE_SIZE((const unsigned char*)(pcVertices + pcHeader->num_verts));

#ifdef AI_BUILD_BIG_ENDIAN
	for (int i = 0; i<pcHeader->num_verts;++i)
	{
		AI_SWAP4( pcTexCoords[i].onseam );
		AI_SWAP4( pcTexCoords[i].s );
		AI_SWAP4( pcTexCoords[i].t );
	}

	for (int i = 0; i<pcHeader->num_tris;++i)
	{
		AI_SWAP4( pcTriangles[i].facesfront);
		AI_SWAP4( pcTriangles[i].vertex[0]);
		AI_SWAP4( pcTriangles[i].vertex[1]);
		AI_SWAP4( pcTriangles[i].vertex[2]);
	}
#endif

	// setup materials
	SetupMaterialProperties_3DGS_MDL5_Quake1();

	// allocate enough storage to hold all vertices and triangles
	aiMesh* pcMesh = new aiMesh();
	
	pcMesh->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;
	pcMesh->mNumVertices = pcHeader->num_tris * 3;
	pcMesh->mNumFaces = pcHeader->num_tris;
	pcMesh->mVertices = new aiVector3D[pcMesh->mNumVertices];
	pcMesh->mTextureCoords[0] = new aiVector3D[pcMesh->mNumVertices];
	pcMesh->mFaces = new aiFace[pcMesh->mNumFaces];
	pcMesh->mNormals = new aiVector3D[pcMesh->mNumVertices];
	pcMesh->mNumUVComponents[0] = 2;

	// there won't be more than one mesh inside the file
	pScene->mRootNode = new aiNode();
	pScene->mRootNode->mNumMeshes = 1;
	pScene->mRootNode->mMeshes = new unsigned int[1];
	pScene->mRootNode->mMeshes[0] = 0;
	pScene->mNumMeshes = 1;
	pScene->mMeshes = new aiMesh*[1];
	pScene->mMeshes[0] = pcMesh;

	// now iterate through all triangles
	unsigned int iCurrent = 0;
	for (unsigned int i = 0; i < (unsigned int) pcHeader->num_tris;++i)
	{
		pcMesh->mFaces[i].mIndices = new unsigned int[3];
		pcMesh->mFaces[i].mNumIndices = 3;

		unsigned int iTemp = iCurrent;
		for (unsigned int c = 0; c < 3;++c,++iCurrent)
		{
			pcMesh->mFaces[i].mIndices[c] = iCurrent;

			// read vertices
			unsigned int iIndex = pcTriangles->vertex[c];
			if (iIndex >= (unsigned int)pcHeader->num_verts)
			{
				iIndex = pcHeader->num_verts-1;
				DefaultLogger::get()->warn("Index overflow in Q1-MDL vertex list.");
			}

			aiVector3D& vec = pcMesh->mVertices[iCurrent];
			vec.x = (float)pcVertices[iIndex].v[0] * pcHeader->scale[0];
			vec.x += pcHeader->translate[0];

			vec.y = (float)pcVertices[iIndex].v[1] * pcHeader->scale[1];
			vec.y += pcHeader->translate[1];
			//vec.y *= -1.0f;

			vec.z = (float)pcVertices[iIndex].v[2] * pcHeader->scale[2];
			vec.z += pcHeader->translate[2];

			// read the normal vector from the precalculated normal table
			MD2::LookupNormalIndex(pcVertices[iIndex].normalIndex,pcMesh->mNormals[iCurrent]);
			//pcMesh->mNormals[iCurrent].y *= -1.0f;

			// read texture coordinates
			float s = (float)pcTexCoords[iIndex].s;
			float t = (float)pcTexCoords[iIndex].t;

			// translate texture coordinates
			if (0 == pcTriangles->facesfront && 0 != pcTexCoords[iIndex].onseam)	{
				s += pcHeader->skinwidth * 0.5f; 
			}

			// Scale s and t to range from 0.0 to 1.0 
			pcMesh->mTextureCoords[0][iCurrent].x = (s + 0.5f) / pcHeader->skinwidth;
			pcMesh->mTextureCoords[0][iCurrent].y = 1.0f-(t + 0.5f) / pcHeader->skinheight;

		}
		pcMesh->mFaces[i].mIndices[0] = iTemp+2;
		pcMesh->mFaces[i].mIndices[1] = iTemp+1;
		pcMesh->mFaces[i].mIndices[2] = iTemp+0;
		pcTriangles++;
	}
	return;
}

// ------------------------------------------------------------------------------------------------
// Setup material properties for Quake and older GameStudio files
void MDLImporter::SetupMaterialProperties_3DGS_MDL5_Quake1( )
{
	const MDL::Header* const pcHeader = (const MDL::Header*)this->mBuffer;

	// allocate ONE material
	pScene->mMaterials    = new aiMaterial*[1];
	pScene->mMaterials[0] = new MaterialHelper();
	pScene->mNumMaterials = 1;

	// setup the material's properties
	const int iMode = (int)aiShadingMode_Gouraud;
	MaterialHelper* const pcHelper = (MaterialHelper*)pScene->mMaterials[0];
	pcHelper->AddProperty<int>(&iMode, 1, AI_MATKEY_SHADING_MODEL);

	aiColor4D clr;
	if (0 != pcHeader->num_skins && pScene->mNumTextures)	{
		// can we replace the texture with a single color?
		clr = this->ReplaceTextureWithColor(pScene->mTextures[0]);
		if (is_not_qnan(clr.r))	{
			delete pScene->mTextures[0];
			delete[] pScene->mTextures;

			pScene->mTextures = NULL;
			pScene->mNumTextures = 0;
		}
		else	{
			clr.b = clr.a = clr.g = clr.r = 1.0f;
			aiString szString;
			::memcpy(szString.data,AI_MAKE_EMBEDDED_TEXNAME(0),3);
			szString.length = 2;
			pcHelper->AddProperty(&szString,AI_MATKEY_TEXTURE_DIFFUSE(0));
		}
	}

	pcHelper->AddProperty<aiColor4D>(&clr, 1,AI_MATKEY_COLOR_DIFFUSE);
	pcHelper->AddProperty<aiColor4D>(&clr, 1,AI_MATKEY_COLOR_SPECULAR);

	clr.r *= 0.05f;clr.g *= 0.05f;
	clr.b *= 0.05f;clr.a  = 1.0f;
	pcHelper->AddProperty<aiColor4D>(&clr, 1,AI_MATKEY_COLOR_AMBIENT);
}

// ------------------------------------------------------------------------------------------------
// Read a MDL 3,4,5 file
void MDLImporter::InternReadFile_3DGS_MDL345( )
{
	ai_assert(NULL != pScene);

	// the header of MDL 3/4/5 is nearly identical to the original Quake1 header
	BE_NCONST MDL::Header *pcHeader = (BE_NCONST MDL::Header*)this->mBuffer;
#ifdef AI_BUILD_BIG_ENDIAN
	FlipQuakeHeader(pcHeader);
#endif
	ValidateHeader_Quake1(pcHeader);

	// current cursor position in the file
	const unsigned char* szCurrent = (const unsigned char*)(pcHeader+1);

	// need to read all textures
	for (unsigned int i = 0; i < (unsigned int)pcHeader->num_skins;++i)	{
		BE_NCONST MDL::Skin* pcSkin;
		pcSkin = (BE_NCONST  MDL::Skin*)szCurrent;
		AI_SWAP4( pcSkin->group);
		// create one output image
		unsigned int iSkip = i ? UINT_MAX : 0;
		if (5 <= iGSFileVersion)
		{
			// MDL5 format could contain MIPmaps
			CreateTexture_3DGS_MDL5((unsigned char*)pcSkin + sizeof(uint32_t),
				pcSkin->group,&iSkip);
		}
		else	{
			CreateTexture_3DGS_MDL4((unsigned char*)pcSkin + sizeof(uint32_t),
				pcSkin->group,&iSkip);
		}
		// need to skip one image
		szCurrent += iSkip + sizeof(uint32_t);
		
	}
	// get a pointer to the texture coordinates
	BE_NCONST MDL::TexCoord_MDL3* pcTexCoords = (BE_NCONST MDL::TexCoord_MDL3*)szCurrent;
	szCurrent += sizeof(MDL::TexCoord_MDL3) * pcHeader->synctype;

	// NOTE: for MDLn formats "synctype" corresponds to the number of UV coords

	// get a pointer to the triangles
	BE_NCONST MDL::Triangle_MDL3* pcTriangles = (BE_NCONST MDL::Triangle_MDL3*)szCurrent;
	szCurrent += sizeof(MDL::Triangle_MDL3) * pcHeader->num_tris;

#ifdef AI_BUILD_BIG_ENDIAN

	for (int i = 0; i<pcHeader->synctype;++i)	{
		AI_SWAP2( pcTexCoords[i].u );
		AI_SWAP2( pcTexCoords[i].v );
	}

	for (int i = 0; i<pcHeader->num_tris;++i)	{
		AI_SWAP2( pcTriangles[i].index_xyz[0]);
		AI_SWAP2( pcTriangles[i].index_xyz[1]);
		AI_SWAP2( pcTriangles[i].index_xyz[2]);
		AI_SWAP2( pcTriangles[i].index_uv[0]);
		AI_SWAP2( pcTriangles[i].index_uv[1]);
		AI_SWAP2( pcTriangles[i].index_uv[2]);
	}

#endif

	VALIDATE_FILE_SIZE(szCurrent);

	// setup materials
	SetupMaterialProperties_3DGS_MDL5_Quake1();

	// allocate enough storage to hold all vertices and triangles
	aiMesh* pcMesh = new aiMesh();
	pcMesh->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;

	pcMesh->mNumVertices = pcHeader->num_tris * 3;
	pcMesh->mNumFaces = pcHeader->num_tris;
	pcMesh->mFaces = new aiFace[pcMesh->mNumFaces];

	// there won't be more than one mesh inside the file
	pScene->mRootNode = new aiNode();
	pScene->mRootNode->mNumMeshes = 1;
	pScene->mRootNode->mMeshes = new unsigned int[1];
	pScene->mRootNode->mMeshes[0] = 0;
	pScene->mNumMeshes = 1;
	pScene->mMeshes = new aiMesh*[1];
	pScene->mMeshes[0] = pcMesh;

	// allocate output storage
	pcMesh->mNumVertices = (unsigned int)pcHeader->num_tris*3;
	pcMesh->mVertices    = new aiVector3D[pcMesh->mNumVertices];
	pcMesh->mNormals     = new aiVector3D[pcMesh->mNumVertices];

	if (pcHeader->synctype)	{
		pcMesh->mTextureCoords[0] = new aiVector3D[pcMesh->mNumVertices];
		pcMesh->mNumUVComponents[0] = 2;
	}

	// now get a pointer to the first frame in the file
	BE_NCONST MDL::Frame* pcFrames = (BE_NCONST MDL::Frame*)szCurrent;
	AI_SWAP4(pcFrames->type);

	// byte packed vertices
	// FIXME: these two snippets below are almost identical ... join them?
	/////////////////////////////////////////////////////////////////////////////////////
	if (0 == pcFrames->type || 3 >= this->iGSFileVersion)	{

		const MDL::SimpleFrame* pcFirstFrame = (const MDL::SimpleFrame*)(szCurrent + sizeof(uint32_t));
		const MDL::Vertex* pcVertices = (const MDL::Vertex*) ((pcFirstFrame->name) + sizeof(pcFirstFrame->name));

		VALIDATE_FILE_SIZE(pcVertices + pcHeader->num_verts);

		// now iterate through all triangles
		unsigned int iCurrent = 0;
		for (unsigned int i = 0; i < (unsigned int) pcHeader->num_tris;++i)	{
			pcMesh->mFaces[i].mIndices = new unsigned int[3];
			pcMesh->mFaces[i].mNumIndices = 3;

			unsigned int iTemp = iCurrent;
			for (unsigned int c = 0; c < 3;++c,++iCurrent)	{
				// read vertices
				unsigned int iIndex = pcTriangles->index_xyz[c];
				if (iIndex >= (unsigned int)pcHeader->num_verts)	{
					iIndex = pcHeader->num_verts-1;
					DefaultLogger::get()->warn("Index overflow in MDLn vertex list");
				}

				aiVector3D& vec = pcMesh->mVertices[iCurrent];
				vec.x = (float)pcVertices[iIndex].v[0] * pcHeader->scale[0];
				vec.x += pcHeader->translate[0];

				vec.y = (float)pcVertices[iIndex].v[1] * pcHeader->scale[1];
				vec.y += pcHeader->translate[1];
				// vec.y *= -1.0f;

				vec.z = (float)pcVertices[iIndex].v[2] * pcHeader->scale[2];
				vec.z += pcHeader->translate[2];

				// read the normal vector from the precalculated normal table
				MD2::LookupNormalIndex(pcVertices[iIndex].normalIndex,pcMesh->mNormals[iCurrent]);
				// pcMesh->mNormals[iCurrent].y *= -1.0f;

				// read texture coordinates
				if (pcHeader->synctype)	{
					ImportUVCoordinate_3DGS_MDL345(pcMesh->mTextureCoords[0][iCurrent],
						pcTexCoords,pcTriangles->index_uv[c]);
				}
			}
			pcMesh->mFaces[i].mIndices[0] = iTemp+2;
			pcMesh->mFaces[i].mIndices[1] = iTemp+1;
			pcMesh->mFaces[i].mIndices[2] = iTemp+0;
			pcTriangles++;
		}

	}
	// short packed vertices 
	/////////////////////////////////////////////////////////////////////////////////////
	else	{
		// now get a pointer to the first frame in the file
		const MDL::SimpleFrame_MDLn_SP* pcFirstFrame = (const MDL::SimpleFrame_MDLn_SP*) (szCurrent + sizeof(uint32_t));

		// get a pointer to the vertices
		const MDL::Vertex_MDL4* pcVertices = (const MDL::Vertex_MDL4*) ((pcFirstFrame->name) + 
			sizeof(pcFirstFrame->name));

		VALIDATE_FILE_SIZE(pcVertices + pcHeader->num_verts);

		// now iterate through all triangles
		unsigned int iCurrent = 0;
		for (unsigned int i = 0; i < (unsigned int) pcHeader->num_tris;++i)	{
			pcMesh->mFaces[i].mIndices = new unsigned int[3];
			pcMesh->mFaces[i].mNumIndices = 3;

			unsigned int iTemp = iCurrent;
			for (unsigned int c = 0; c < 3;++c,++iCurrent)	{
				// read vertices
				unsigned int iIndex = pcTriangles->index_xyz[c];
				if (iIndex >= (unsigned int)pcHeader->num_verts)	{
					iIndex = pcHeader->num_verts-1;
					DefaultLogger::get()->warn("Index overflow in MDLn vertex list");
				}

				aiVector3D& vec = pcMesh->mVertices[iCurrent];
				vec.x = (float)pcVertices[iIndex].v[0] * pcHeader->scale[0];
				vec.x += pcHeader->translate[0];

				vec.y = (float)pcVertices[iIndex].v[1] * pcHeader->scale[1];
				vec.y += pcHeader->translate[1];
				// vec.y *= -1.0f;

				vec.z = (float)pcVertices[iIndex].v[2] * pcHeader->scale[2];
				vec.z += pcHeader->translate[2];

				// read the normal vector from the precalculated normal table
				MD2::LookupNormalIndex(pcVertices[iIndex].normalIndex,pcMesh->mNormals[iCurrent]);
				// pcMesh->mNormals[iCurrent].y *= -1.0f;

				// read texture coordinates
				if (pcHeader->synctype)	{
					ImportUVCoordinate_3DGS_MDL345(pcMesh->mTextureCoords[0][iCurrent],
						pcTexCoords,pcTriangles->index_uv[c]);
				}
			}
			pcMesh->mFaces[i].mIndices[0] = iTemp+2;
			pcMesh->mFaces[i].mIndices[1] = iTemp+1;
			pcMesh->mFaces[i].mIndices[2] = iTemp+0;
			pcTriangles++;
		}
	}

	// For MDL5 we will need to build valid texture coordinates
	// basing upon the file loaded (only support one file as skin)
	if (0x5 == iGSFileVersion)
		CalculateUVCoordinates_MDL5();
	return;
}

// ------------------------------------------------------------------------------------------------
// Get a single UV coordinate for Quake and older GameStudio files
void MDLImporter::ImportUVCoordinate_3DGS_MDL345( 
	aiVector3D& vOut,
	const MDL::TexCoord_MDL3* pcSrc, 
	unsigned int iIndex)
{
	ai_assert(NULL != pcSrc);
	const MDL::Header* const pcHeader = (const MDL::Header*)this->mBuffer;

	// validate UV indices
	if (iIndex >= (unsigned int) pcHeader->synctype)	{
		iIndex = pcHeader->synctype-1;
		DefaultLogger::get()->warn("Index overflow in MDLn UV coord list");
	}

	float s = (float)pcSrc[iIndex].u;
	float t = (float)pcSrc[iIndex].v;

	// Scale s and t to range from 0.0 to 1.0 
	if (0x5 != iGSFileVersion)	{
		s = (s + 0.5f)      / pcHeader->skinwidth;
		t = 1.0f-(t + 0.5f) / pcHeader->skinheight;
	}

	vOut.x = s;
	vOut.y = t;
	vOut.z = 0.0f;
}

// ------------------------------------------------------------------------------------------------
// Compute UV coordinates for a MDL5 file
void MDLImporter::CalculateUVCoordinates_MDL5()
{
	const MDL::Header* const pcHeader = (const MDL::Header*)this->mBuffer;
	if (pcHeader->num_skins && this->pScene->mNumTextures)	{
		const aiTexture* pcTex = this->pScene->mTextures[0];

		// if the file is loaded in DDS format: get the size of the
		// texture from the header of the DDS file
		// skip three DWORDs and read first height, then the width
		unsigned int iWidth, iHeight;
		if (!pcTex->mHeight)	{
			const uint32_t* piPtr = (uint32_t*)pcTex->pcData;

			piPtr += 3;
			iHeight = (unsigned int)*piPtr++;
			iWidth  = (unsigned int)*piPtr;
			if (!iHeight || !iWidth)
			{
				DefaultLogger::get()->warn("Either the width or the height of the "
					"embedded DDS texture is zero. Unable to compute final texture "
					"coordinates. The texture coordinates remain in their original "
					"0-x/0-y (x,y = texture size) range.");
				iWidth  = 1;
				iHeight = 1;
			}
		}
		else	{
			iWidth  = pcTex->mWidth;
			iHeight = pcTex->mHeight;
		}

		if (1 != iWidth || 1 != iHeight)	{
			const float fWidth = (float)iWidth;
			const float fHeight = (float)iHeight;
			aiMesh* pcMesh = this->pScene->mMeshes[0];
			for (unsigned int i = 0; i < pcMesh->mNumVertices;++i)
			{
				pcMesh->mTextureCoords[0][i].x /= fWidth;
				pcMesh->mTextureCoords[0][i].y /= fHeight;
				pcMesh->mTextureCoords[0][i].y = 1.0f - pcMesh->mTextureCoords[0][i].y; // DX to OGL
			}
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Validate the header of a MDL7 file
void MDLImporter::ValidateHeader_3DGS_MDL7(const MDL::Header_MDL7* pcHeader)
{
	ai_assert(NULL != pcHeader);

	// There are some fixed sizes ...
	if (sizeof(MDL::ColorValue_MDL7) != pcHeader->colorvalue_stc_size)	{
		throw DeadlyImportError( 
			"[3DGS MDL7] sizeof(MDL::ColorValue_MDL7) != pcHeader->colorvalue_stc_size");
	}
	if (sizeof(MDL::TexCoord_MDL7) != pcHeader->skinpoint_stc_size)	{
		throw DeadlyImportError( 
			"[3DGS MDL7] sizeof(MDL::TexCoord_MDL7) != pcHeader->skinpoint_stc_size");
	}
	if (sizeof(MDL::Skin_MDL7) != pcHeader->skin_stc_size)	{
		throw DeadlyImportError( 
			"sizeof(MDL::Skin_MDL7) != pcHeader->skin_stc_size");
	}

	// if there are no groups ... how should we load such a file?
	if(!pcHeader->groups_num)	{
		throw DeadlyImportError( "[3DGS MDL7] No frames found");
	}
}

// ------------------------------------------------------------------------------------------------
// resolve bone animation matrices
void MDLImporter::CalcAbsBoneMatrices_3DGS_MDL7(MDL::IntBone_MDL7** apcOutBones)
{
	const MDL::Header_MDL7 *pcHeader = (const MDL::Header_MDL7*)this->mBuffer;
	const MDL::Bone_MDL7* pcBones = (const MDL::Bone_MDL7*)(pcHeader+1);
	ai_assert(NULL != apcOutBones);

	// first find the bone that has NO parent, calculate the
	// animation matrix for it, then go on and search for the next parent
	// index (0) and so on until we can't find a new node.
	uint16_t iParent = 0xffff;
	uint32_t iIterations = 0;
	while (iIterations++ < pcHeader->bones_num)	{
		for (uint32_t iBone = 0; iBone < pcHeader->bones_num;++iBone)	{
			BE_NCONST MDL::Bone_MDL7* pcBone = _AI_MDL7_ACCESS_PTR(pcBones,iBone,
				pcHeader->bone_stc_size,MDL::Bone_MDL7);

			AI_SWAP2(pcBone->parent_index);
			AI_SWAP4(pcBone->x);
			AI_SWAP4(pcBone->y);
			AI_SWAP4(pcBone->z);

			if (iParent == pcBone->parent_index)	{
				// MDL7 readme
				////////////////////////////////////////////////////////////////
				/*
				The animation matrix is then calculated the following way:

				vector3 bPos = <absolute bone position>
				matrix44 laM;   // local animation matrix
				sphrvector key_rotate = <bone rotation>
		
				matrix44 m1,m2;
				create_trans_matrix(m1, -bPos.x, -bPos.y, -bPos.z);
				create_trans_matrix(m2, -bPos.x, -bPos.y, -bPos.z);

				create_rotation_matrix(laM,key_rotate);

				laM = sm1 * laM;
				laM = laM * sm2;
				*/
				/////////////////////////////////////////////////////////////////

				MDL::IntBone_MDL7* const pcOutBone = apcOutBones[iBone];

				// store the parent index of the bone
				pcOutBone->iParent = pcBone->parent_index;
				if (0xffff != iParent)	{
					const MDL::IntBone_MDL7* pcParentBone = apcOutBones[iParent];
					pcOutBone->mOffsetMatrix.a4 = -pcParentBone->vPosition.x;
					pcOutBone->mOffsetMatrix.b4 = -pcParentBone->vPosition.y;
					pcOutBone->mOffsetMatrix.c4 = -pcParentBone->vPosition.z;
				}
				pcOutBone->vPosition.x = pcBone->x; 
				pcOutBone->vPosition.y = pcBone->y;
				pcOutBone->vPosition.z = pcBone->z;
				pcOutBone->mOffsetMatrix.a4 -= pcBone->x;
				pcOutBone->mOffsetMatrix.b4 -= pcBone->y;
				pcOutBone->mOffsetMatrix.c4 -= pcBone->z;

				if (AI_MDL7_BONE_STRUCT_SIZE__NAME_IS_NOT_THERE == pcHeader->bone_stc_size)	{
					// no real name for our poor bone is specified :-(	
					pcOutBone->mName.length = ::sprintf(pcOutBone->mName.data,
						"UnnamedBone_%i",iBone);
				}
				else	{
					// Make sure we won't run over the buffer's end if there is no
					// terminal 0 character (however the documentation says there
					// should be one)
					uint32_t iMaxLen = pcHeader->bone_stc_size-16;
					for (uint32_t qq = 0; qq < iMaxLen;++qq)	{
						if (!pcBone->name[qq])	{
							iMaxLen = qq;
							break;
						}
					}

					// store the name of the bone
					pcOutBone->mName.length = (size_t)iMaxLen;
					::memcpy(pcOutBone->mName.data,pcBone->name,pcOutBone->mName.length);
					pcOutBone->mName.data[pcOutBone->mName.length] = '\0';
				}
			}
		}
		++iParent;
	}
}

// ------------------------------------------------------------------------------------------------
// read bones from a MDL7 file
MDL::IntBone_MDL7** MDLImporter::LoadBones_3DGS_MDL7()
{
  const MDL::Header_MDL7 *pcHeader = (const MDL::Header_MDL7*)this->mBuffer;
	if (pcHeader->bones_num)	{
		// validate the size of the bone data structure in the file
		if (AI_MDL7_BONE_STRUCT_SIZE__NAME_IS_20_CHARS  != pcHeader->bone_stc_size &&
			AI_MDL7_BONE_STRUCT_SIZE__NAME_IS_32_CHARS  != pcHeader->bone_stc_size &&
			AI_MDL7_BONE_STRUCT_SIZE__NAME_IS_NOT_THERE != pcHeader->bone_stc_size)
		{
			DefaultLogger::get()->warn("Unknown size of bone data structure");
			return NULL;
		}

		MDL::IntBone_MDL7** apcBonesOut = new MDL::IntBone_MDL7*[pcHeader->bones_num];
		for (uint32_t crank = 0; crank < pcHeader->bones_num;++crank)
			apcBonesOut[crank] = new MDL::IntBone_MDL7();

		// and calculate absolute bone offset matrices ...
		CalcAbsBoneMatrices_3DGS_MDL7(apcBonesOut);
		return apcBonesOut;
	}
	return NULL;
}

// ------------------------------------------------------------------------------------------------
// read faces from a MDL7 file
void MDLImporter::ReadFaces_3DGS_MDL7(const MDL::IntGroupInfo_MDL7& groupInfo,
	MDL::IntGroupData_MDL7& groupData)
{
	const MDL::Header_MDL7 *pcHeader = (const MDL::Header_MDL7*)this->mBuffer; 
	BE_NCONST MDL::Triangle_MDL7* pcGroupTris = groupInfo.pcGroupTris;

	// iterate through all triangles and build valid display lists
	unsigned int iOutIndex = 0;
	for (unsigned int iTriangle = 0; iTriangle < (unsigned int)groupInfo.pcGroup->numtris; ++iTriangle)	{  
		AI_SWAP2(pcGroupTris->v_index[0]);
		AI_SWAP2(pcGroupTris->v_index[1]);
		AI_SWAP2(pcGroupTris->v_index[2]);

		// iterate through all indices of the current triangle
		for (unsigned int c = 0; c < 3;++c,++iOutIndex)	{

			// validate the vertex index
			unsigned int iIndex = pcGroupTris->v_index[c];
			if(iIndex > (unsigned int)groupInfo.pcGroup->numverts)	{
				// (we might need to read this section a second time - to process frame vertices correctly)
				const_cast<MDL::Triangle_MDL7*>(pcGroupTris)->v_index[c] = iIndex = groupInfo.pcGroup->numverts-1;
				DefaultLogger::get()->warn("Index overflow in MDL7 vertex list");
			}

			// write the output face index
			groupData.pcFaces[iTriangle].mIndices[2-c] = iOutIndex;

			aiVector3D& vPosition = groupData.vPositions[ iOutIndex ];
			vPosition.x = _AI_MDL7_ACCESS_VERT(groupInfo.pcGroupVerts,iIndex, pcHeader->mainvertex_stc_size) .x;
			vPosition.y = _AI_MDL7_ACCESS_VERT(groupInfo.pcGroupVerts,iIndex,pcHeader->mainvertex_stc_size) .y;
			vPosition.z = _AI_MDL7_ACCESS_VERT(groupInfo.pcGroupVerts,iIndex,pcHeader->mainvertex_stc_size) .z;

			// if we have bones, save the index
			if (!groupData.aiBones.empty()) {
				groupData.aiBones[iOutIndex] = _AI_MDL7_ACCESS_VERT(groupInfo.pcGroupVerts,
					iIndex,pcHeader->mainvertex_stc_size).vertindex;
			}

			// now read the normal vector
			if (AI_MDL7_FRAMEVERTEX030305_STCSIZE <= pcHeader->mainvertex_stc_size)	{
				// read the full normal vector
				aiVector3D& vNormal = groupData.vNormals[ iOutIndex ];
				vNormal.x = _AI_MDL7_ACCESS_VERT(groupInfo.pcGroupVerts,iIndex,pcHeader->mainvertex_stc_size) .norm[0];
				AI_SWAP4(vNormal.x);    
				vNormal.y = _AI_MDL7_ACCESS_VERT(groupInfo.pcGroupVerts,iIndex,pcHeader->mainvertex_stc_size) .norm[1];
				AI_SWAP4(vNormal.y);    
				vNormal.z = _AI_MDL7_ACCESS_VERT(groupInfo.pcGroupVerts,iIndex,pcHeader->mainvertex_stc_size) .norm[2];
				AI_SWAP4(vNormal.z);    
			}
			else if (AI_MDL7_FRAMEVERTEX120503_STCSIZE <= pcHeader->mainvertex_stc_size)	{
				// read the normal vector from Quake2's smart table
				aiVector3D& vNormal = groupData.vNormals[ iOutIndex ];
				MD2::LookupNormalIndex(_AI_MDL7_ACCESS_VERT(groupInfo.pcGroupVerts,iIndex,
					pcHeader->mainvertex_stc_size) .norm162index,vNormal);
			}
			// validate and process the first uv coordinate set
			if (pcHeader->triangle_stc_size >= AI_MDL7_TRIANGLE_STD_SIZE_ONE_UV)	{

				if (groupInfo.pcGroup->num_stpts)	{
					AI_SWAP2(pcGroupTris->skinsets[0].st_index[0]); 
					AI_SWAP2(pcGroupTris->skinsets[0].st_index[1]);
					AI_SWAP2(pcGroupTris->skinsets[0].st_index[2]);

					iIndex = pcGroupTris->skinsets[0].st_index[c];
					if(iIndex > (unsigned int)groupInfo.pcGroup->num_stpts)	{
						iIndex = groupInfo.pcGroup->num_stpts-1;
						DefaultLogger::get()->warn("Index overflow in MDL7 UV coordinate list (#1)");
					}

					float u = groupInfo.pcGroupUVs[iIndex].u;
					float v = 1.0f-groupInfo.pcGroupUVs[iIndex].v; // DX to OGL

					groupData.vTextureCoords1[iOutIndex].x = u;
					groupData.vTextureCoords1[iOutIndex].y = v;
				}
				// assign the material index, but only if it is existing
				if (pcHeader->triangle_stc_size >= AI_MDL7_TRIANGLE_STD_SIZE_ONE_UV_WITH_MATINDEX){
					AI_SWAP4(pcGroupTris->skinsets[0].material);		
					groupData.pcFaces[iTriangle].iMatIndex[0] = pcGroupTris->skinsets[0].material;
				}     
			}
			// validate and process the second uv coordinate set
			if (pcHeader->triangle_stc_size >= AI_MDL7_TRIANGLE_STD_SIZE_TWO_UV)	{

				if (groupInfo.pcGroup->num_stpts)	{
					AI_SWAP2(pcGroupTris->skinsets[1].st_index[0]); 
					AI_SWAP2(pcGroupTris->skinsets[1].st_index[1]);
					AI_SWAP2(pcGroupTris->skinsets[1].st_index[2]);
					AI_SWAP4(pcGroupTris->skinsets[1].material);		

					iIndex = pcGroupTris->skinsets[1].st_index[c];
					if(iIndex > (unsigned int)groupInfo.pcGroup->num_stpts)	{
						iIndex = groupInfo.pcGroup->num_stpts-1;
						DefaultLogger::get()->warn("Index overflow in MDL7 UV coordinate list (#2)");
					}

					float u = groupInfo.pcGroupUVs[ iIndex ].u;
					float v = 1.0f-groupInfo.pcGroupUVs[ iIndex ].v;

					groupData.vTextureCoords2[ iOutIndex ].x = u;
					groupData.vTextureCoords2[ iOutIndex ].y = v; // DX to OGL

					// check whether we do really need the second texture
					// coordinate set ... wastes memory and loading time
					if (0 != iIndex && (u != groupData.vTextureCoords1[ iOutIndex ].x ||
						v != groupData.vTextureCoords1[ iOutIndex ].y ) )
						groupData.bNeed2UV = true;

					// if the material differs, we need a second skin, too
					if (pcGroupTris->skinsets[ 1 ].material != pcGroupTris->skinsets[ 0 ].material)
						groupData.bNeed2UV = true;
				}
				// assign the material index
				groupData.pcFaces[ iTriangle ].iMatIndex[ 1 ] = pcGroupTris->skinsets[ 1 ].material;
			}
		}
		// get the next triangle in the list
		pcGroupTris = (BE_NCONST MDL::Triangle_MDL7*)((const char*)pcGroupTris + pcHeader->triangle_stc_size);
	}
}

// ------------------------------------------------------------------------------------------------
// handle frames in a MDL7 file
bool MDLImporter::ProcessFrames_3DGS_MDL7(const MDL::IntGroupInfo_MDL7& groupInfo,
	MDL::IntGroupData_MDL7&  groupData,
	MDL::IntSharedData_MDL7& shared,
	const unsigned char*     szCurrent,
	const unsigned char**    szCurrentOut)
{
	ai_assert(NULL != szCurrent && NULL != szCurrentOut);
	const MDL::Header_MDL7 *pcHeader = (const MDL::Header_MDL7*)mBuffer;

	// if we have no bones we can simply skip all frames,
	// otherwise we'll need to process them.
	// FIX: If we need another frame than the first we must apply frame vertex replacements ...
	for(unsigned int iFrame = 0; iFrame < (unsigned int)groupInfo.pcGroup->numframes;++iFrame)	{
		MDL::IntFrameInfo_MDL7 frame ((BE_NCONST MDL::Frame_MDL7*)szCurrent,iFrame);

		AI_SWAP4(frame.pcFrame->vertices_count);     
		AI_SWAP4(frame.pcFrame->transmatrix_count);

		const unsigned int iAdd = pcHeader->frame_stc_size + 
			frame.pcFrame->vertices_count * pcHeader->framevertex_stc_size +
			frame.pcFrame->transmatrix_count * pcHeader->bonetrans_stc_size;

		if (((const char*)szCurrent - (const char*)pcHeader) + iAdd > (unsigned int)pcHeader->data_size)	{
			DefaultLogger::get()->warn("Index overflow in frame area. "
				"Ignoring all frames and all further mesh groups, too.");

			// don't parse more groups if we can't even read one
			// FIXME: sometimes this seems to occur even for valid files ...
			*szCurrentOut = szCurrent;
			return false;
		}
		// our output frame?
		if (configFrameID == iFrame)	{
			BE_NCONST MDL::Vertex_MDL7* pcFrameVertices = (BE_NCONST MDL::Vertex_MDL7*)(szCurrent+pcHeader->frame_stc_size);

			for (unsigned int qq = 0; qq < frame.pcFrame->vertices_count;++qq)	{
				// I assume this are simple replacements for normal vertices, the bone index serving 
				// as the index of the vertex to be replaced.
				uint16_t iIndex = _AI_MDL7_ACCESS(pcFrameVertices,qq,pcHeader->framevertex_stc_size,MDL::Vertex_MDL7).vertindex;
				AI_SWAP2(iIndex);
				if (iIndex >= groupInfo.pcGroup->numverts)	{
					DefaultLogger::get()->warn("Invalid vertex index in frame vertex section");
					continue;
				}

				aiVector3D vPosition,vNormal;

				vPosition.x = _AI_MDL7_ACCESS_VERT(pcFrameVertices,qq,pcHeader->framevertex_stc_size) .x;
				AI_SWAP4(vPosition.x);    
				vPosition.y = _AI_MDL7_ACCESS_VERT(pcFrameVertices,qq,pcHeader->framevertex_stc_size) .y;
				AI_SWAP4(vPosition.y);		
				vPosition.z = _AI_MDL7_ACCESS_VERT(pcFrameVertices,qq,pcHeader->framevertex_stc_size) .z;
				AI_SWAP4(vPosition.z);

				// now read the normal vector
				if (AI_MDL7_FRAMEVERTEX030305_STCSIZE <= pcHeader->mainvertex_stc_size)	{
					// read the full normal vector
					vNormal.x = _AI_MDL7_ACCESS_VERT(pcFrameVertices,qq,pcHeader->framevertex_stc_size) .norm[0];
					AI_SWAP4(vNormal.x);     
					vNormal.y = _AI_MDL7_ACCESS_VERT(pcFrameVertices,qq,pcHeader->framevertex_stc_size) .norm[1];
					AI_SWAP4(vNormal.y);		
					vNormal.z = _AI_MDL7_ACCESS_VERT(pcFrameVertices,qq,pcHeader->framevertex_stc_size) .norm[2];
					AI_SWAP4(vNormal.z);
				}
				else if (AI_MDL7_FRAMEVERTEX120503_STCSIZE <= pcHeader->mainvertex_stc_size)	{
					// read the normal vector from Quake2's smart table
					MD2::LookupNormalIndex(_AI_MDL7_ACCESS_VERT(pcFrameVertices,qq,
						pcHeader->framevertex_stc_size) .norm162index,vNormal);
				}

				// FIXME: O(n^2) at the moment ...
				BE_NCONST MDL::Triangle_MDL7* pcGroupTris = groupInfo.pcGroupTris;
				unsigned int iOutIndex = 0;
				for (unsigned int iTriangle = 0; iTriangle < (unsigned int)groupInfo.pcGroup->numtris; ++iTriangle)	{
					// iterate through all indices of the current triangle
					for (unsigned int c = 0; c < 3;++c,++iOutIndex)	{
						// replace the vertex with the new data
						const unsigned int iCurIndex = pcGroupTris->v_index[c];
						if (iCurIndex == iIndex)	{
							groupData.vPositions[iOutIndex] = vPosition;
							groupData.vNormals[iOutIndex] = vNormal;
						}
					}
					// get the next triangle in the list
					pcGroupTris = (BE_NCONST MDL::Triangle_MDL7*)((const char*)
						pcGroupTris + pcHeader->triangle_stc_size);
				}
			}
		}
		// parse bone trafo matrix keys (only if there are bones ...)
		if (shared.apcOutBones) {
			ParseBoneTrafoKeys_3DGS_MDL7(groupInfo,frame,shared);
		}
		szCurrent += iAdd;
	}
	*szCurrentOut = szCurrent;
	return true;
}

// ------------------------------------------------------------------------------------------------
// Sort faces by material, handle multiple UVs correctly
void MDLImporter::SortByMaterials_3DGS_MDL7(
	const MDL::IntGroupInfo_MDL7&   groupInfo,
	MDL::IntGroupData_MDL7&         groupData,
	MDL::IntSplittedGroupData_MDL7& splittedGroupData)
{
	const unsigned int iNumMaterials = (unsigned int)splittedGroupData.shared.pcMats.size();
	if (!groupData.bNeed2UV)	{
		// if we don't need a second set of texture coordinates there is no reason to keep it in memory ...
		groupData.vTextureCoords2.clear();

		// allocate the array
		splittedGroupData.aiSplit = new std::vector<unsigned int>*[iNumMaterials];

		for (unsigned int m = 0; m < iNumMaterials;++m)
			splittedGroupData.aiSplit[m] = new std::vector<unsigned int>();

		// iterate through all faces and sort by material
		for (unsigned int iFace = 0; iFace < (unsigned int)groupInfo.pcGroup->numtris;++iFace)	{
			// check range
			if (groupData.pcFaces[iFace].iMatIndex[0] >= iNumMaterials)	{
				// use the last material instead
				splittedGroupData.aiSplit[iNumMaterials-1]->push_back(iFace);

				// sometimes MED writes -1, but normally only if there is only
				// one skin assigned. No warning in this case
				if(0xFFFFFFFF != groupData.pcFaces[iFace].iMatIndex[0])
					DefaultLogger::get()->warn("Index overflow in MDL7 material list [#0]");
			}
			else splittedGroupData.aiSplit[groupData.pcFaces[iFace].
				iMatIndex[0]]->push_back(iFace);
		}
	}
	else
	{
		// we need to build combined materials for each combination of
		std::vector<MDL::IntMaterial_MDL7> avMats;
		avMats.reserve(iNumMaterials*2);

		// fixme: why on the heap?
		std::vector<std::vector<unsigned int>* > aiTempSplit(iNumMaterials*2);
		for (unsigned int m = 0; m < iNumMaterials;++m)
			aiTempSplit[m] = new std::vector<unsigned int>();

		// iterate through all faces and sort by material
		for (unsigned int iFace = 0; iFace < (unsigned int)groupInfo.pcGroup->numtris;++iFace)	{
			// check range
			unsigned int iMatIndex = groupData.pcFaces[iFace].iMatIndex[0];
			if (iMatIndex >= iNumMaterials)	{
				// sometimes MED writes -1, but normally only if there is only
				// one skin assigned. No warning in this case
				if(UINT_MAX != iMatIndex)
					DefaultLogger::get()->warn("Index overflow in MDL7 material list [#1]");
				iMatIndex = iNumMaterials-1;
			}
			unsigned int iMatIndex2 = groupData.pcFaces[iFace].iMatIndex[1];

			unsigned int iNum = iMatIndex;
			if (UINT_MAX != iMatIndex2 && iMatIndex != iMatIndex2)	{
				if (iMatIndex2 >= iNumMaterials)	{
					// sometimes MED writes -1, but normally only if there is only
					// one skin assigned. No warning in this case
					DefaultLogger::get()->warn("Index overflow in MDL7 material list [#2]");
					iMatIndex2 = iNumMaterials-1;
				}

				// do a slow seach in the list ...
				iNum = 0;
				bool bFound = false;
				for (std::vector<MDL::IntMaterial_MDL7>::iterator i =  avMats.begin();i != avMats.end();++i,++iNum){
					if ((*i).iOldMatIndices[0] == iMatIndex && (*i).iOldMatIndices[1] == iMatIndex2)	{
						// reuse this material
						bFound = true;
						break;
					}
				}
				if (!bFound)	{
					//  build a new material ...
					MDL::IntMaterial_MDL7 sHelper;
					sHelper.pcMat = new MaterialHelper();
					sHelper.iOldMatIndices[0] = iMatIndex;
					sHelper.iOldMatIndices[1] = iMatIndex2;
					JoinSkins_3DGS_MDL7(splittedGroupData.shared.pcMats[iMatIndex],
						splittedGroupData.shared.pcMats[iMatIndex2],sHelper.pcMat);

					// and add it to the list
					avMats.push_back(sHelper);
					iNum = (unsigned int)avMats.size()-1;
				}
				// adjust the size of the file array
				if (iNum == aiTempSplit.size()) {
					aiTempSplit.push_back(new std::vector<unsigned int>());
				}
			}
			aiTempSplit[iNum]->push_back(iFace);
		}

		// now add the newly created materials to the old list
		if (0 == groupInfo.iIndex)	{
			splittedGroupData.shared.pcMats.resize(avMats.size());
			for (unsigned int o = 0; o < avMats.size();++o)
				splittedGroupData.shared.pcMats[o] = avMats[o].pcMat;
		}
		else	{
			// This might result in redundant materials ...
			splittedGroupData.shared.pcMats.resize(iNumMaterials + avMats.size());
			for (unsigned int o = iNumMaterials; o < avMats.size();++o)
				splittedGroupData.shared.pcMats[o] = avMats[o].pcMat;
		}

		// and build the final face-to-material array
		splittedGroupData.aiSplit = new std::vector<unsigned int>*[aiTempSplit.size()];
		for (unsigned int m = 0; m < iNumMaterials;++m)
			splittedGroupData.aiSplit[m] = aiTempSplit[m];
	}
}

// ------------------------------------------------------------------------------------------------
// Read a MDL7 file
void MDLImporter::InternReadFile_3DGS_MDL7( )
{
	ai_assert(NULL != pScene);

	MDL::IntSharedData_MDL7 sharedData;

	// current cursor position in the file
	BE_NCONST MDL::Header_MDL7 *pcHeader = (BE_NCONST MDL::Header_MDL7*)this->mBuffer; 
	const unsigned char* szCurrent = (const unsigned char*)(pcHeader+1);

	AI_SWAP4(pcHeader->version);
	AI_SWAP4(pcHeader->bones_num);
	AI_SWAP4(pcHeader->groups_num);
	AI_SWAP4(pcHeader->data_size);
	AI_SWAP4(pcHeader->entlump_size);
	AI_SWAP4(pcHeader->medlump_size);
	AI_SWAP2(pcHeader->bone_stc_size);
	AI_SWAP2(pcHeader->skin_stc_size);
	AI_SWAP2(pcHeader->colorvalue_stc_size);
	AI_SWAP2(pcHeader->material_stc_size);
	AI_SWAP2(pcHeader->skinpoint_stc_size);
	AI_SWAP2(pcHeader->triangle_stc_size);
	AI_SWAP2(pcHeader->mainvertex_stc_size);
	AI_SWAP2(pcHeader->framevertex_stc_size);
	AI_SWAP2(pcHeader->bonetrans_stc_size);
	AI_SWAP2(pcHeader->frame_stc_size);

	// validate the header of the file. There are some structure
	// sizes that are expected by the loader to be constant 
	this->ValidateHeader_3DGS_MDL7(pcHeader);

	// load all bones (they are shared by all groups, so
	// we'll need to add them to all groups/meshes later)
	// apcBonesOut is a list of all bones or NULL if they could not been loaded 
	szCurrent += pcHeader->bones_num * pcHeader->bone_stc_size;
	sharedData.apcOutBones = this->LoadBones_3DGS_MDL7();

	// vector to held all created meshes
	std::vector<aiMesh*>* avOutList;

	// 3 meshes per group - that should be OK for most models
	avOutList = new std::vector<aiMesh*>[pcHeader->groups_num];
	for (uint32_t i = 0; i < pcHeader->groups_num;++i)
		avOutList[i].reserve(3);

	// buffer to held the names of all groups in the file
	char* aszGroupNameBuffer = new char[AI_MDL7_MAX_GROUPNAMESIZE*pcHeader->groups_num];

	// read all groups
	for (unsigned int iGroup = 0; iGroup < (unsigned int)pcHeader->groups_num;++iGroup)	{
		MDL::IntGroupInfo_MDL7 groupInfo((BE_NCONST MDL::Group_MDL7*)szCurrent,iGroup);
		szCurrent = (const unsigned char*)(groupInfo.pcGroup+1);

		VALIDATE_FILE_SIZE(szCurrent);

		AI_SWAP4(groupInfo.pcGroup->groupdata_size);
		AI_SWAP4(groupInfo.pcGroup->numskins);
		AI_SWAP4(groupInfo.pcGroup->num_stpts);
		AI_SWAP4(groupInfo.pcGroup->numtris);
		AI_SWAP4(groupInfo.pcGroup->numverts);
		AI_SWAP4(groupInfo.pcGroup->numframes);

		if (1 != groupInfo.pcGroup->typ)	{
			// Not a triangle-based mesh
			DefaultLogger::get()->warn("[3DGS MDL7] Not a triangle mesh group. Continuing happily");
		}

		// store the name of the group
		const unsigned int ofs = iGroup*AI_MDL7_MAX_GROUPNAMESIZE;
		::memcpy(&aszGroupNameBuffer[ofs],
			groupInfo.pcGroup->name,AI_MDL7_MAX_GROUPNAMESIZE);

		// make sure '\0' is at the end
		aszGroupNameBuffer[ofs+AI_MDL7_MAX_GROUPNAMESIZE-1] = '\0';

		// read all skins
		sharedData.pcMats.reserve(sharedData.pcMats.size() + groupInfo.pcGroup->numskins);
		sharedData.abNeedMaterials.resize(sharedData.abNeedMaterials.size() +
			groupInfo.pcGroup->numskins,false);

		for (unsigned int iSkin = 0; iSkin < (unsigned int)groupInfo.pcGroup->numskins;++iSkin)	{
			ParseSkinLump_3DGS_MDL7(szCurrent,&szCurrent,sharedData.pcMats);
		}
		// if we have absolutely no skin loaded we need to generate a default material
		if (sharedData.pcMats.empty())	{
			const int iMode = (int)aiShadingMode_Gouraud;
			sharedData.pcMats.push_back(new MaterialHelper());
			MaterialHelper* pcHelper = (MaterialHelper*)sharedData.pcMats[0];
			pcHelper->AddProperty<int>(&iMode, 1, AI_MATKEY_SHADING_MODEL);

			aiColor3D clr;
			clr.b = clr.g = clr.r = 0.6f;
			pcHelper->AddProperty<aiColor3D>(&clr, 1,AI_MATKEY_COLOR_DIFFUSE);
			pcHelper->AddProperty<aiColor3D>(&clr, 1,AI_MATKEY_COLOR_SPECULAR);

			clr.b = clr.g = clr.r = 0.05f;
			pcHelper->AddProperty<aiColor3D>(&clr, 1,AI_MATKEY_COLOR_AMBIENT);

			aiString szName;
			szName.Set(AI_DEFAULT_MATERIAL_NAME);
			pcHelper->AddProperty(&szName,AI_MATKEY_NAME);

			sharedData.abNeedMaterials.resize(1,false);
		}

		// now get a pointer to all texture coords in the group
		groupInfo.pcGroupUVs = (BE_NCONST MDL::TexCoord_MDL7*)szCurrent;      
		for(int i = 0; i < groupInfo.pcGroup->num_stpts; ++i){  
			AI_SWAP4(groupInfo.pcGroupUVs[i].u);
			AI_SWAP4(groupInfo.pcGroupUVs[i].v);
		}
		szCurrent += pcHeader->skinpoint_stc_size * groupInfo.pcGroup->num_stpts;

		// now get a pointer to all triangle in the group
		groupInfo.pcGroupTris = (BE_NCONST MDL::Triangle_MDL7*)szCurrent;
		szCurrent += pcHeader->triangle_stc_size * groupInfo.pcGroup->numtris;

		// now get a pointer to all vertices in the group
		groupInfo.pcGroupVerts = (BE_NCONST MDL::Vertex_MDL7*)szCurrent;
		for(int i = 0; i < groupInfo.pcGroup->numverts; ++i){  
			AI_SWAP4(groupInfo.pcGroupVerts[i].x);
			AI_SWAP4(groupInfo.pcGroupVerts[i].y);
			AI_SWAP4(groupInfo.pcGroupVerts[i].z);

			AI_SWAP2(groupInfo.pcGroupVerts[i].vertindex);
			//We can not swap the normal information now as we don't know which of the two kinds it is
		}
		szCurrent += pcHeader->mainvertex_stc_size * groupInfo.pcGroup->numverts;
		VALIDATE_FILE_SIZE(szCurrent);

		MDL::IntSplittedGroupData_MDL7 splittedGroupData(sharedData,avOutList[iGroup]);
		MDL::IntGroupData_MDL7 groupData;
		if (groupInfo.pcGroup->numtris && groupInfo.pcGroup->numverts)
		{
			// build output vectors
			const unsigned int iNumVertices = groupInfo.pcGroup->numtris*3;
			groupData.vPositions.resize(iNumVertices);
			groupData.vNormals.resize(iNumVertices);

			if (sharedData.apcOutBones)groupData.aiBones.resize(iNumVertices,UINT_MAX);

			// it is also possible that there are 0 UV coordinate sets
			if (groupInfo.pcGroup->num_stpts){
				groupData.vTextureCoords1.resize(iNumVertices,aiVector3D());

				// check whether the triangle data structure is large enough
				// to contain a second UV coodinate set
				if (pcHeader->triangle_stc_size >= AI_MDL7_TRIANGLE_STD_SIZE_TWO_UV)	{
					groupData.vTextureCoords2.resize(iNumVertices,aiVector3D());
					groupData.bNeed2UV = true;
				}
			}
			groupData.pcFaces = new MDL::IntFace_MDL7[groupInfo.pcGroup->numtris];

			// read all faces into the preallocated arrays
			ReadFaces_3DGS_MDL7(groupInfo, groupData);

			// sort by materials
			SortByMaterials_3DGS_MDL7(groupInfo, groupData,
				splittedGroupData);

			for (unsigned int qq = 0; qq < sharedData.pcMats.size();++qq)	{
				if (!splittedGroupData.aiSplit[qq]->empty())
					sharedData.abNeedMaterials[qq] = true;
			}
		}
		else DefaultLogger::get()->warn("[3DGS MDL7] Mesh group consists of 0 "
			"vertices or faces. It will be skipped.");

		// process all frames and generate output meshes
		ProcessFrames_3DGS_MDL7(groupInfo,groupData, sharedData,szCurrent,&szCurrent);
		GenerateOutputMeshes_3DGS_MDL7(groupData,splittedGroupData);
	}

	// generate a nodegraph and subnodes for each group
	pScene->mRootNode = new aiNode();

	// now we need to build a final mesh list
	for (uint32_t i = 0; i < pcHeader->groups_num;++i)
		pScene->mNumMeshes += (unsigned int)avOutList[i].size();
	
	pScene->mMeshes = new aiMesh*[pScene->mNumMeshes];	{
		unsigned int p = 0,q = 0;
		for (uint32_t i = 0; i < pcHeader->groups_num;++i)	{
			for (unsigned int a = 0; a < avOutList[i].size();++a)	{
				pScene->mMeshes[p++] = avOutList[i][a];
			}
			if (!avOutList[i].empty())++pScene->mRootNode->mNumChildren;
		}
		// we will later need an extra node to serve as parent for all bones
		if (sharedData.apcOutBones)++pScene->mRootNode->mNumChildren;
		this->pScene->mRootNode->mChildren = new aiNode*[pScene->mRootNode->mNumChildren];
		p = 0;
		for (uint32_t i = 0; i < pcHeader->groups_num;++i)	{
			if (avOutList[i].empty())continue;

			aiNode* const pcNode = pScene->mRootNode->mChildren[p] = new aiNode();
			pcNode->mNumMeshes = (unsigned int)avOutList[i].size();
			pcNode->mMeshes = new unsigned int[pcNode->mNumMeshes];
			pcNode->mParent = this->pScene->mRootNode;
			for (unsigned int a = 0; a < pcNode->mNumMeshes;++a)
				pcNode->mMeshes[a] = q + a;
			q += (unsigned int)avOutList[i].size();

			// setup the name of the node
			char* const szBuffer = &aszGroupNameBuffer[i*AI_MDL7_MAX_GROUPNAMESIZE];
			if ('\0' == *szBuffer)
				pcNode->mName.length = ::sprintf(szBuffer,"Group_%i",p);
			else pcNode->mName.length = ::strlen(szBuffer);
			::strcpy(pcNode->mName.data,szBuffer);
			++p;
		}
	}

	// if there is only one root node with a single child we can optimize it a bit ...
	if (1 == pScene->mRootNode->mNumChildren && !sharedData.apcOutBones)	{
		aiNode* pcOldRoot = this->pScene->mRootNode;
		pScene->mRootNode = pcOldRoot->mChildren[0];
		pcOldRoot->mChildren[0] = NULL;
		delete pcOldRoot;
		pScene->mRootNode->mParent = NULL;
	}
	else pScene->mRootNode->mName.Set("<mesh_root>");

	delete[] avOutList;
	delete[] aszGroupNameBuffer; 
	AI_DEBUG_INVALIDATE_PTR(avOutList);
	AI_DEBUG_INVALIDATE_PTR(aszGroupNameBuffer);

	// build a final material list. 
	CopyMaterials_3DGS_MDL7(sharedData);
	HandleMaterialReferences_3DGS_MDL7();

	// generate output bone animations and add all bones to the scenegraph
	if (sharedData.apcOutBones)	{
		// this step adds empty dummy bones to the nodegraph
		// insert another dummy node to avoid name conflicts
		aiNode* const pc = pScene->mRootNode->mChildren[pScene->mRootNode->mNumChildren-1] = new aiNode();

		pc->mName.Set("<skeleton_root>");

		// add bones to the nodegraph
		AddBonesToNodeGraph_3DGS_MDL7((const Assimp::MDL::IntBone_MDL7 **)
			sharedData.apcOutBones,pc,0xffff);

		// this steps build a valid output animation
		BuildOutputAnims_3DGS_MDL7((const Assimp::MDL::IntBone_MDL7 **)
			sharedData.apcOutBones);
	}
}

// ------------------------------------------------------------------------------------------------
// Copy materials
void MDLImporter::CopyMaterials_3DGS_MDL7(MDL::IntSharedData_MDL7 &shared)
{
	pScene->mNumMaterials = (unsigned int)shared.pcMats.size();
	pScene->mMaterials = new aiMaterial*[pScene->mNumMaterials];
	for (unsigned int i = 0; i < pScene->mNumMaterials;++i)
		pScene->mMaterials[i] = shared.pcMats[i];
}


// ------------------------------------------------------------------------------------------------
// Process material references
void MDLImporter::HandleMaterialReferences_3DGS_MDL7()
{
	// search for referrer materials
	for (unsigned int i = 0; i < pScene->mNumMaterials;++i)	{
		int iIndex = 0;
		if (AI_SUCCESS == aiGetMaterialInteger(pScene->mMaterials[i],AI_MDL7_REFERRER_MATERIAL, &iIndex) )	{
			for (unsigned int a = 0; a < pScene->mNumMeshes;++a)	{
				aiMesh* const pcMesh = pScene->mMeshes[a];
				if (i == pcMesh->mMaterialIndex) {
					pcMesh->mMaterialIndex = iIndex;
				}
			}
			// collapse the rest of the array
			delete pScene->mMaterials[i];
			for (unsigned int pp = i; pp < pScene->mNumMaterials-1;++pp)	{

				pScene->mMaterials[pp] = pScene->mMaterials[pp+1];
				for (unsigned int a = 0; a < pScene->mNumMeshes;++a)	{
					aiMesh* const pcMesh = pScene->mMeshes[a];
					if (pcMesh->mMaterialIndex > i)--pcMesh->mMaterialIndex;
				}
			}
			--pScene->mNumMaterials;
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Read bone transformation keys
void MDLImporter::ParseBoneTrafoKeys_3DGS_MDL7(
	const MDL::IntGroupInfo_MDL7& groupInfo,
	IntFrameInfo_MDL7&            frame,
	MDL::IntSharedData_MDL7&      shared)
{
	const MDL::Header_MDL7* const pcHeader = (const MDL::Header_MDL7*)this->mBuffer;

	// only the first group contains bone animation keys
	if (frame.pcFrame->transmatrix_count)	{
		if (!groupInfo.iIndex)	{
			// skip all frames vertices. We can't support them
			const MDL::BoneTransform_MDL7* pcBoneTransforms = (const MDL::BoneTransform_MDL7*)
				(((const char*)frame.pcFrame) + pcHeader->frame_stc_size + 
				frame.pcFrame->vertices_count * pcHeader->framevertex_stc_size);

			// read all transformation matrices
			for (unsigned int iTrafo = 0; iTrafo < frame.pcFrame->transmatrix_count;++iTrafo)	{
				if(pcBoneTransforms->bone_index >= pcHeader->bones_num)	{
					DefaultLogger::get()->warn("Index overflow in frame area. "
						"Unable to parse this bone transformation");
				}
				else	{
					AddAnimationBoneTrafoKey_3DGS_MDL7(frame.iIndex,
						pcBoneTransforms,shared.apcOutBones);
				}
				pcBoneTransforms = (const MDL::BoneTransform_MDL7*)(
					(const char*)pcBoneTransforms + pcHeader->bonetrans_stc_size);
			}
		}
		else	{
			DefaultLogger::get()->warn("Ignoring animation keyframes in groups != 0");
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Attach bones to the output nodegraph
void MDLImporter::AddBonesToNodeGraph_3DGS_MDL7(const MDL::IntBone_MDL7** apcBones,
	aiNode* pcParent,uint16_t iParentIndex)
{
	ai_assert(NULL != apcBones && NULL != pcParent);

	// get a pointer to the header ...
	const MDL::Header_MDL7* const pcHeader = (const MDL::Header_MDL7*)this->mBuffer;

	const MDL::IntBone_MDL7** apcBones2 = apcBones;
	for (uint32_t i = 0; i <  pcHeader->bones_num;++i)	{

		const MDL::IntBone_MDL7* const pcBone = *apcBones2++;
		if (pcBone->iParent == iParentIndex) {
			++pcParent->mNumChildren;
		}
	}
	pcParent->mChildren = new aiNode*[pcParent->mNumChildren];
	unsigned int qq = 0;
	for (uint32_t i = 0; i <  pcHeader->bones_num;++i)	{

		const MDL::IntBone_MDL7* const pcBone = *apcBones++;
		if (pcBone->iParent != iParentIndex)continue;

		aiNode* pcNode = pcParent->mChildren[qq++] = new aiNode();
		pcNode->mName = aiString( pcBone->mName );

		AddBonesToNodeGraph_3DGS_MDL7(apcBones,pcNode,(uint16_t)i);
	}
}

// ------------------------------------------------------------------------------------------------
// Build output animations
void MDLImporter::BuildOutputAnims_3DGS_MDL7(
	const MDL::IntBone_MDL7** apcBonesOut)
{
	ai_assert(NULL != apcBonesOut);
	const MDL::Header_MDL7* const pcHeader = (const MDL::Header_MDL7*)mBuffer;

	// one animation ...
	aiAnimation* pcAnim = new aiAnimation();
	for (uint32_t i = 0; i < pcHeader->bones_num;++i)	{
		if (!apcBonesOut[i]->pkeyPositions.empty())	{

			// get the last frame ... (needn't be equal to pcHeader->frames_num)
			for (size_t qq = 0; qq < apcBonesOut[i]->pkeyPositions.size();++qq)	{
				pcAnim->mDuration = std::max(pcAnim->mDuration, (double)
					apcBonesOut[i]->pkeyPositions[qq].mTime);
			}
			++pcAnim->mNumChannels;
		}
	}
	if (pcAnim->mDuration)	{
		pcAnim->mChannels = new aiNodeAnim*[pcAnim->mNumChannels];

		unsigned int iCnt = 0;
		for (uint32_t i = 0; i < pcHeader->bones_num;++i)	{
			if (!apcBonesOut[i]->pkeyPositions.empty())	{
				const MDL::IntBone_MDL7* const intBone = apcBonesOut[i];

				aiNodeAnim* const pcNodeAnim = pcAnim->mChannels[iCnt++] = new aiNodeAnim();
				pcNodeAnim->mNodeName = aiString( intBone->mName );

				// allocate enough storage for all keys
				pcNodeAnim->mNumPositionKeys = (unsigned int)intBone->pkeyPositions.size();
				pcNodeAnim->mNumScalingKeys  = (unsigned int)intBone->pkeyPositions.size();
				pcNodeAnim->mNumRotationKeys = (unsigned int)intBone->pkeyPositions.size();

				pcNodeAnim->mPositionKeys = new aiVectorKey[pcNodeAnim->mNumPositionKeys];
				pcNodeAnim->mScalingKeys  = new aiVectorKey[pcNodeAnim->mNumPositionKeys];
				pcNodeAnim->mRotationKeys = new aiQuatKey[pcNodeAnim->mNumPositionKeys];

				// copy all keys
				for (unsigned int qq = 0; qq < pcNodeAnim->mNumPositionKeys;++qq)	{
					pcNodeAnim->mPositionKeys[qq] = intBone->pkeyPositions[qq];
					pcNodeAnim->mScalingKeys[qq] = intBone->pkeyScalings[qq];
					pcNodeAnim->mRotationKeys[qq] = intBone->pkeyRotations[qq];
				}
			}
		}

		// store the output animation
		pScene->mNumAnimations = 1;
		pScene->mAnimations = new aiAnimation*[1];
		pScene->mAnimations[0] = pcAnim;
	}
	else delete pcAnim;
}

// ------------------------------------------------------------------------------------------------
void MDLImporter::AddAnimationBoneTrafoKey_3DGS_MDL7(unsigned int iTrafo,
	const MDL::BoneTransform_MDL7* pcBoneTransforms,
	MDL::IntBone_MDL7** apcBonesOut)
{
	ai_assert(NULL != pcBoneTransforms);
	ai_assert(NULL != apcBonesOut);

	// first .. get the transformation matrix
	aiMatrix4x4 mTransform;
	mTransform.a1 = pcBoneTransforms->m[0];
	mTransform.b1 = pcBoneTransforms->m[1];
	mTransform.c1 = pcBoneTransforms->m[2];
	mTransform.d1 = pcBoneTransforms->m[3];

	mTransform.a2 = pcBoneTransforms->m[4];
	mTransform.b2 = pcBoneTransforms->m[5];
	mTransform.c2 = pcBoneTransforms->m[6];
	mTransform.d2 = pcBoneTransforms->m[7];

	mTransform.a3 = pcBoneTransforms->m[8];
	mTransform.b3 = pcBoneTransforms->m[9];
	mTransform.c3 = pcBoneTransforms->m[10];
	mTransform.d3 = pcBoneTransforms->m[11];

	// now decompose the transformation matrix into separate
	// scaling, rotation and translation
	aiVectorKey vScaling,vPosition;
	aiQuatKey qRotation;

	// FIXME: Decompose will assert in debug builds if the matrix is invalid ...
	mTransform.Decompose(vScaling.mValue,qRotation.mValue,vPosition.mValue);

	// now generate keys
	vScaling.mTime = qRotation.mTime = vPosition.mTime = (double)iTrafo;

	// add the keys to the bone
	MDL::IntBone_MDL7* const pcBoneOut = apcBonesOut[pcBoneTransforms->bone_index];
	pcBoneOut->pkeyPositions.push_back	( vPosition );
	pcBoneOut->pkeyScalings.push_back	( vScaling  );
	pcBoneOut->pkeyRotations.push_back	( qRotation );
}

// ------------------------------------------------------------------------------------------------
// Construct output meshes
void MDLImporter::GenerateOutputMeshes_3DGS_MDL7(
	MDL::IntGroupData_MDL7& groupData,
	MDL::IntSplittedGroupData_MDL7& splittedGroupData)
{
	const MDL::IntSharedData_MDL7& shared = splittedGroupData.shared;

	// get a pointer to the header ...
	const MDL::Header_MDL7* const pcHeader = (const MDL::Header_MDL7*)this->mBuffer;
	const unsigned int iNumOutBones = pcHeader->bones_num;

	for (std::vector<MaterialHelper*>::size_type i = 0; i < shared.pcMats.size();++i)	{
		if (!splittedGroupData.aiSplit[i]->empty())	{

			// allocate the output mesh
			aiMesh* pcMesh = new aiMesh();

			pcMesh->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;
			pcMesh->mMaterialIndex = (unsigned int)i;

			// allocate output storage
			pcMesh->mNumFaces = (unsigned int)splittedGroupData.aiSplit[i]->size();
			pcMesh->mFaces = new aiFace[pcMesh->mNumFaces];

			pcMesh->mNumVertices = pcMesh->mNumFaces*3;
			pcMesh->mVertices = new aiVector3D[pcMesh->mNumVertices];
			pcMesh->mNormals = new aiVector3D[pcMesh->mNumVertices];

			if (!groupData.vTextureCoords1.empty())	{
				pcMesh->mNumUVComponents[0] = 2;
				pcMesh->mTextureCoords[0] = new aiVector3D[pcMesh->mNumVertices];
				if (!groupData.vTextureCoords2.empty())	{
					pcMesh->mNumUVComponents[1] = 2;
					pcMesh->mTextureCoords[1] = new aiVector3D[pcMesh->mNumVertices];
				}
			}

			// iterate through all faces and build an unique set of vertices
			unsigned int iCurrent = 0;
			for (unsigned int iFace = 0; iFace < pcMesh->mNumFaces;++iFace)	{
				pcMesh->mFaces[iFace].mNumIndices = 3;
				pcMesh->mFaces[iFace].mIndices = new unsigned int[3];

				unsigned int iSrcFace = splittedGroupData.aiSplit[i]->operator[](iFace);
				const MDL::IntFace_MDL7& oldFace = groupData.pcFaces[iSrcFace];

				// iterate through all face indices
				for (unsigned int c = 0; c < 3;++c)	{
					const uint32_t iIndex = oldFace.mIndices[c];
					pcMesh->mVertices[iCurrent] = groupData.vPositions[iIndex];
					pcMesh->mNormals[iCurrent] = groupData.vNormals[iIndex];

					if (!groupData.vTextureCoords1.empty())	{

						pcMesh->mTextureCoords[0][iCurrent] = groupData.vTextureCoords1[iIndex];
						if (!groupData.vTextureCoords2.empty())	{
							pcMesh->mTextureCoords[1][iCurrent] = groupData.vTextureCoords2[iIndex];
						}
					}
					pcMesh->mFaces[iFace].mIndices[c] = iCurrent++;
				}
			}

			// if we have bones in the mesh we'll need to generate
			// proper vertex weights for them
			if (!groupData.aiBones.empty())	{
				std::vector<std::vector<unsigned int> > aaiVWeightList;
				aaiVWeightList.resize(iNumOutBones);

				int iCurrent = 0;
				for (unsigned int iFace = 0; iFace < pcMesh->mNumFaces;++iFace)	{
					unsigned int iSrcFace = splittedGroupData.aiSplit[i]->operator[](iFace);
					const MDL::IntFace_MDL7& oldFace = groupData.pcFaces[iSrcFace];

					// iterate through all face indices
					for (unsigned int c = 0; c < 3;++c)	{
						unsigned int iBone = groupData.aiBones[ oldFace.mIndices[c] ];
						if (UINT_MAX != iBone)	{
							if (iBone >= iNumOutBones)	{
								DefaultLogger::get()->error("Bone index overflow. "
									"The bone index of a vertex exceeds the allowed range. ");
								iBone = iNumOutBones-1;
							}
							aaiVWeightList[ iBone ].push_back ( iCurrent );
						}
						++iCurrent;
					}
				}
				// now check which bones are required ...
				for (std::vector<std::vector<unsigned int> >::const_iterator k =  aaiVWeightList.begin();k != aaiVWeightList.end();++k)	{
					if (!(*k).empty()) {
						++pcMesh->mNumBones;
					}
				}
				pcMesh->mBones = new aiBone*[pcMesh->mNumBones];
				iCurrent = 0;
				for (std::vector<std::vector<unsigned int> >::const_iterator k = aaiVWeightList.begin();k!= aaiVWeightList.end();++k,++iCurrent)
				{
					if ((*k).empty())
						continue;

					// seems we'll need this node
					aiBone* pcBone = pcMesh->mBones[ iCurrent ] = new aiBone();
					pcBone->mName = aiString(shared.apcOutBones[ iCurrent ]->mName);
					pcBone->mOffsetMatrix = shared.apcOutBones[ iCurrent ]->mOffsetMatrix;

					// setup vertex weights
					pcBone->mNumWeights = (unsigned int)(*k).size();
					pcBone->mWeights = new aiVertexWeight[pcBone->mNumWeights];

					for (unsigned int weight = 0; weight < pcBone->mNumWeights;++weight)	{
						pcBone->mWeights[weight].mVertexId = (*k)[weight]; 
						pcBone->mWeights[weight].mWeight = 1.0f;
					}
				}
			}
			// add the mesh to the list of output meshes
			splittedGroupData.avOutList.push_back(pcMesh);
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Join to materials
void MDLImporter::JoinSkins_3DGS_MDL7(
	MaterialHelper* pcMat1,
	MaterialHelper* pcMat2,
	MaterialHelper* pcMatOut)
{
	ai_assert(NULL != pcMat1 && NULL != pcMat2 && NULL != pcMatOut);

	// first create a full copy of the first skin property set
	// and assign it to the output material
	MaterialHelper::CopyPropertyList(pcMatOut,pcMat1);

	int iVal = 0;
	pcMatOut->AddProperty<int>(&iVal,1,AI_MATKEY_UVWSRC_DIFFUSE(0));

	// then extract the diffuse texture from the second skin,
	// setup 1 as UV source and we have it
	aiString sString;
	if(AI_SUCCESS == aiGetMaterialString ( pcMat2, AI_MATKEY_TEXTURE_DIFFUSE(0),&sString ))	{
		iVal = 1;
		pcMatOut->AddProperty<int>(&iVal,1,AI_MATKEY_UVWSRC_DIFFUSE(1));
		pcMatOut->AddProperty(&sString,AI_MATKEY_TEXTURE_DIFFUSE(1));
	}
}

// ------------------------------------------------------------------------------------------------
// Read a half-life 2 MDL
void MDLImporter::InternReadFile_HL2( )
{
	//const MDL::Header_HL2* pcHeader = (const MDL::Header_HL2*)this->mBuffer;
	throw DeadlyImportError("HL2 MDLs are not implemented");
}

#endif // !! ASSIMP_BUILD_NO_MDL_IMPORTER