assimp/code/MDRLoader.cpp

/*
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Open Asset Import Library (ASSIMP)
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*/

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

#include "AssimpPCH.h"
#include "MDRLoader.h"

using namespace Assimp;
using namespace Assimp::MDR;

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

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

// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file. 
bool MDRImporter::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);

	return !(extension.length() != 4 || extension[0] != '.' ||
			 extension[1] != 'm' && extension[1] != 'M' ||
			 extension[2] != 'd' && extension[2] != 'D' ||
			 extension[3] != 'r' && extension[3] != 'R');
}

// ------------------------------------------------------------------------------------------------
// Validate the header of the given MDR file
void MDRImporter::ValidateHeader()
{
	if (pcHeader->ident != AI_MDR_MAGIC_NUMBER_BE &&
		pcHeader->ident != AI_MDR_MAGIC_NUMBER_LE)
	{
		char szBuffer[5];
		szBuffer[0] = ((char*)&pcHeader->ident)[0];
		szBuffer[1] = ((char*)&pcHeader->ident)[1];
		szBuffer[2] = ((char*)&pcHeader->ident)[2];
		szBuffer[3] = ((char*)&pcHeader->ident)[3];
		szBuffer[4] = '\0';

		throw new ImportErrorException("Invalid MDR magic word: should be 5MDR, the "
			"magic word found is " + std::string( szBuffer ));
	}

	if (pcHeader->version != AI_MDR_VERSION)
		DefaultLogger::get()->warn("Unsupported MDR file version (2 (AI_MDR_VERSION) was expected)");

	if (!pcHeader->numBones)
		DefaultLogger::get()->warn("MDR: At least one bone must be there");

	// validate all LODs
	if (pcHeader->ofsLODs > fileSize) 

	// validate all frames
	if (pcHeader->ofsFrames + sizeof(MDR::Frame) * (pcHeader->numBones-1) *
		sizeof(MDR::Bone) * pcHeader->numFrames > fileSize)
	{
		throw new ImportErrorException("MDR: header is invalid - frame out of range");
	}

	// check whether the requested frame is existing
	if (this->configFrameID >= pcHeader->numFrames)
		throw new ImportErrorException("The requested frame is not available");
}

// ------------------------------------------------------------------------------------------------
// Validate the header of a given MDR file LOD
void MDRImporter::ValidateLODHeader(BE_NCONST MDR::LOD* pcLOD)
{
	AI_SWAP4(pcLOD->ofsSurfaces);
	AI_SWAP4(pcLOD->numSurfaces);
	AI_SWAP4(pcLOD->ofsEnd);

    const unsigned int iMax = this->fileSize - (unsigned int)((int8_t*)pcLOD-(int8_t*)pcHeader);

	if (!pcLOD->numSurfaces)
		throw new ImportErrorException("MDR: LOD has zero surfaces assigned");
}

// ------------------------------------------------------------------------------------------------
// Validate the header of a given MDR file surface
void MDRImporter::ValidateSurfaceHeader(BE_NCONST MDR::Surface* pcSurf)
{
	AI_SWAP4(pcSurf->ident);
	AI_SWAP4(pcSurf->numBoneReferences);
	AI_SWAP4(pcSurf->numTriangles);
	AI_SWAP4(pcSurf->numVerts);
	AI_SWAP4(pcSurf->ofsBoneReferences);
	AI_SWAP4(pcSurf->ofsEnd);
	AI_SWAP4(pcSurf->ofsTriangles);
	AI_SWAP4(pcSurf->ofsVerts);
	AI_SWAP4(pcSurf->shaderIndex);

    const unsigned int iMax = this->fileSize - (unsigned int)((int8_t*)pcSurf-(int8_t*)pcHeader);

	// not exact - there could be extra data in the vertices.
	if (pcSurf->ofsTriangles + pcSurf->numTriangles*sizeof(MDR::Triangle) > iMax ||
		pcSurf->ofsVerts + pcSurf->numVerts*sizeof(MDR::Vertex) > iMax)
    {
		throw new ImportErrorException("MDR: Surface header is invalid");
    }
}

// ------------------------------------------------------------------------------------------------
// Setup configuration properties
void MDRImporter::SetupProperties(const Importer* pImp)
{
	// The AI_CONFIG_IMPORT_MDR_KEYFRAME option overrides the
	//     AI_CONFIG_IMPORT_GLOBAL_KEYFRAME option.
	if(0xffffffff == (this->configFrameID = pImp->GetPropertyInteger(
		AI_CONFIG_IMPORT_MDR_KEYFRAME,0xffffffff)))
	{
		this->configFrameID = pImp->GetPropertyInteger(AI_CONFIG_IMPORT_GLOBAL_KEYFRAME,0);
	}
}

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

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

	// check whether the mdr file is large enough to contain the file header
	fileSize = (unsigned int)file->FileSize();
	if( fileSize < sizeof(MDR::Header))
		throw new ImportErrorException( "MDR File is too small.");

	std::vector<unsigned char> mBuffer2(fileSize);
	file->Read( &mBuffer2[0], 1, fileSize);
	mBuffer = &mBuffer2[0];

	// validate the file header and do BigEndian byte swapping for all sub headers
	this->pcHeader = (BE_NCONST MDR::Header*)this->mBuffer;
	this->ValidateHeader();

	// go to the first LOD
	LE_NCONST MDR::LOD* lod = (LE_NCONST MDR::LOD*)((uint8_t*)this->pcHeader+pcHeader->ofsLODs);
	std::vector<aiMesh*> outMeshes;
	outMeshes.reserve(lod->numSurfaces);

	// get a pointer to the first surface
	LE_NCONST MDR::Surface* surf = (LE_NCONST MDR::Surface*)((uint8_t*)lod+lod->ofsSurfaces);
	for (uint32_t i = 0; i < lod->numSurfaces; ++i)
	{
		if (surf->numTriangles && surf->numVerts && surf->numBoneReferences)
		{
			outMeshes.push_back(new aiMesh());
			aiMesh* mesh = outMeshes.back();

			mesh->mNumFaces = surf->numTriangles;
			mesh->mNumVertices = mesh->mNumFaces*3;
			mesh->mNumBones = surf->numBoneReferences;

			mesh->mFaces = new aiFace[mesh->mNumFaces];
			mesh->mVertices = new aiVector3D[mesh->mNumVertices];
			mesh->mTextureCoords[0] = new aiVector3D[mesh->mNumVertices];
			mesh->mBones = new aiBone*[mesh->mNumBones];

			// allocate output bones
			for (unsigned int p = 0; p < mesh->mNumBones;++p)
			{
				aiBone* bone = mesh->mBones[p] = new aiBone();
				bone->mName.length = ::sprintf(  bone->mName.data, "B_%i",p);
			}

			std::vector<BoneWeightInfo> mWeights;
			mWeights.reserve(surf->numVerts << 1);

			std::vector<VertexInfo> mVertices(surf->numVerts);

			// get a pointer to the first vertex
			LE_NCONST MDR::Vertex* v = (LE_NCONST MDR::Vertex*)((uint8_t*)surf+surf->ofsVerts);
			for (unsigned int m = 0; m < surf->numVerts; ++m)
			{
				// get a pointer to the next vertex
				v = (LE_NCONST MDR::Vertex*)((uint8_t*)(v+1) + v->numWeights*sizeof(MDR::Weight));

#ifndef AI_BUILD_BIG_ENDIAN
				AI_SWAP4(v->numWeights);
				AI_SWAP4(v->normal.x);AI_SWAP4(v->normal.y);AI_SWAP4(v->normal.z);
				AI_SWAP4(v->texCoords.x);AI_SWAP4(v->texCoords.y);
#endif        

				VertexInfo& vert = mVertices[m];
				vert.uv.x = v->texCoords.x;  vert.uv.y = v->texCoords.y; 
				vert.normal = v->normal;
				vert.start  = (unsigned int)mWeights.size();
				vert.num    = v->numWeights;

				for (unsigned int l = 0; l < vert.num; ++l)
				{
				}
			}

			// find out how large the output weight buffers must be
			LE_NCONST MDR::Triangle* tri = (LE_NCONST MDR::Triangle*)((uint8_t*)surf+surf->ofsTriangles);
			LE_NCONST MDR::Triangle* const triEnd = tri + surf->numTriangles;
			for (; tri != triEnd; ++tri)
			{
				for (unsigned int o = 0; o < 3;++o)
				{
#ifndef AI_BUILD_BIG_ENDIAN        
					AI_SWAP4(tri->indexes[o]);
#endif          
					register unsigned int temp = tri->indexes[o];
					if (temp >= surf->numVerts)
						throw new ImportErrorException("MDR: Vertex index is out of range");

					VertexInfo& vert = mVertices[temp];
					for (unsigned int l = vert.start; l < vert.start + vert.num; ++l)
					{
						if (mWeights[l].first >= surf->numBoneReferences)
							throw new ImportErrorException("MDR: Bone index is out of range");

						++mesh->mBones[mWeights[l].first]->mNumWeights;
					}
				}
			}

			// allocate storage for output bone weights
			for (unsigned int p = 0; p < mesh->mNumBones;++p)
			{
				aiBone* bone = mesh->mBones[p];
				ai_assert(0 != bone->mNumWeights);
				bone->mWeights = new aiVertexWeight[bone->mNumWeights];
			}

			// and build the final output buffers
		}

		// get a pointer to the next surface
		surf = (LE_NCONST MDR::Surface*)((uint8_t*)surf + surf->ofsEnd);	
	}

	pScene->mNumMeshes = (unsigned int) outMeshes.size();
	pScene->mMeshes = new aiMesh*[pScene->mNumMeshes];
	::memcpy(pScene->mMeshes,&outMeshes[0],sizeof(void*)*pScene->mNumMeshes);
}