assimp/code/NDOLoader.cpp

/*
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Open Asset Import Library (assimp)
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*/

/** @file  NDOLoader.cpp
 *  Implementation of the NDO importer class.
 */

#include "AssimpPCH.h"
#ifndef AI_BUILD_NO_NDO_IMPORTER
#include "NDOLoader.h"

using namespace Assimp;
#define for_each BOOST_FOREACH

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

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

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

	if ((checkSig || !extension.length()) && pIOHandler) {
		const char* tokens[] = {"nendo"};
		return SearchFileHeaderForToken(pIOHandler,pFile,tokens,1,5);
	}
	return false;
}

// ------------------------------------------------------------------------------------------------
// Build a string of all file extensions supported
void NDOImporter::GetExtensionList(std::set<std::string>& extensions)
{
	extensions.insert("ndo");
}

// ------------------------------------------------------------------------------------------------
// Setup configuration properties for the loader
void NDOImporter::SetupProperties(const Importer* /*pImp*/)
{
	// nothing to be done for the moment
}

// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure. 
void NDOImporter::InternReadFile( const std::string& pFile, 
	aiScene* pScene, IOSystem* pIOHandler)
{
	StreamReaderBE reader(pIOHandler->Open( pFile, "rb"));

	// first 9 bytes are nendo file format ("nendo 1.n")
	const char* head = (const char*)reader.GetPtr();
	reader.IncPtr(9);

	if (strncmp("nendo ",head,6)) {
		throw DeadlyImportError("Not a Nendo file; magic signature missing");
	}
	// check if this is a supported version. if not, continue, too -- users,
	// please don't complain if it doesn't work then ...
	unsigned int file_format = 12;
	if (!strncmp("1.0",head+6,3)) {
		file_format = 10;
		DefaultLogger::get()->info("NDO file format is 1.0");
	}
	else if (!strncmp("1.1",head+6,3)) {
		file_format = 11;
		DefaultLogger::get()->info("NDO file format is 1.1");
	}
	else if (!strncmp("1.2",head+6,3)) {
		file_format = 12;
		DefaultLogger::get()->info("NDO file format is 1.2");
	}
	else {
		DefaultLogger::get()->warn(std::string("Unrecognized nendo file format version, continuing happily ... :") + (head+6));
	}

	reader.IncPtr(2); /* skip flags */
	if (file_format >= 12) {
		reader.IncPtr(2);
	}
	unsigned int temp = reader.GetU1();

	std::vector<Object> objects(temp); /* buffer to store all the loaded objects in */

	// read all objects
	for (unsigned int o = 0; o < objects.size(); ++o) {
		
//		if (file_format < 12) {
			if (!reader.GetI1()) {
				continue; /* skip over empty object */
			}
		//	reader.GetI2();
//		}
		Object& obj = objects[o];

		temp = file_format >= 12 ? reader.GetU4() : reader.GetU2();
		head = (const char*)reader.GetPtr();
		reader.IncPtr(temp + 76); /* skip unknown stuff */

		obj.name = std::string(head, temp);

		// read edge table
		temp = file_format >= 12 ? reader.GetU4() : reader.GetU2();
		obj.edges.reserve(temp);
		for (unsigned int e = 0; e < temp; ++e) {
			
			obj.edges.push_back(Edge());
			Edge& edge = obj.edges.back();

			for (unsigned int i = 0; i< 8; ++i) {
				edge.edge[i] = file_format >= 12 ? reader.GetU4() : reader.GetU2();
			}
			edge.hard =  file_format >= 11 ? reader.GetU1() : 0;
			for (unsigned int i = 0; i< 8; ++i) {
				edge.color[i] = reader.GetU1();
			}
		}

		// read face table
		temp = file_format >= 12 ? reader.GetU4() : reader.GetU2();
		obj.faces.reserve(temp);
		for (unsigned int e = 0; e < temp; ++e) {
			
			obj.faces.push_back(Face());
			Face& face = obj.faces.back();

			face.elem = file_format >= 12 ? reader.GetU4() : reader.GetU2();
		}

		// read vertex table
		temp = file_format >= 12 ? reader.GetU4() : reader.GetU2();
		obj.vertices.reserve(temp);
		for (unsigned int e = 0; e < temp; ++e) {
			
			obj.vertices.push_back(Vertex());
			Vertex& v = obj.vertices.back();

			v.num = file_format >= 12 ? reader.GetU4() : reader.GetU2();
			v.val.x = reader.GetF4();
			v.val.y = reader.GetF4();
			v.val.z = reader.GetF4();
		}

		// read UVs
		temp = file_format >= 12 ? reader.GetU4() : reader.GetU2();
		for (unsigned int e = 0; e < temp; ++e) {
			 file_format >= 12 ? reader.GetU4() : reader.GetU2();
		}

		temp = file_format >= 12 ? reader.GetU4() : reader.GetU2();
		for (unsigned int e = 0; e < temp; ++e) {
			 file_format >= 12 ? reader.GetU4() : reader.GetU2();
		}

		if (reader.GetU1()) {
			const unsigned int x = reader.GetU2(), y = reader.GetU2();
			temp = 0;
			while (temp < x*y)  {
				unsigned int repeat = reader.GetU1();
				reader.GetU1();
				reader.GetU1();
				reader.GetU1();
				temp += repeat;
			}
		}
	}

	// construct a dummy node graph and add all named objects as child nodes
	aiNode* root = pScene->mRootNode = new aiNode("$NDODummyRoot");
	aiNode** cc = root->mChildren = new aiNode* [ root->mNumChildren = static_cast<unsigned int>( objects.size()) ] ();
	pScene->mMeshes = new aiMesh* [ root->mNumChildren] ();

	std::vector<aiVector3D> vertices;
	std::vector<unsigned int> indices;

	for_each(const Object& obj,objects) {
		aiNode* nd = *cc++ = new aiNode(obj.name);
		nd->mParent = root;

		// translated from a python dict() - a vector might be sufficient as well
		typedef std::map<unsigned int, unsigned int>  FaceTable;
		FaceTable face_table;

		unsigned int n = 0;
		for_each(const Edge& edge, obj.edges) {
		
			face_table[edge.edge[2]] = n;
			face_table[edge.edge[3]] = n;

			++n;
		}

		aiMesh* mesh = new aiMesh();
		aiFace* faces = mesh->mFaces = new aiFace[mesh->mNumFaces=face_table.size()];

		vertices.clear();
		vertices.reserve(4 * face_table.size()); // arbitrarily choosen 
		for_each(FaceTable::value_type& v, face_table) {
			indices.clear();

			aiFace& f = *faces++;
		
			const unsigned int key = v.first;
			unsigned int cur_edge = v.second;
			while (1) {
				unsigned int next_edge, next_vert;
				if (key == obj.edges[cur_edge].edge[3]) {
					next_edge = obj.edges[cur_edge].edge[5];
					next_vert = obj.edges[cur_edge].edge[1];
				}
				else {
					next_edge = obj.edges[cur_edge].edge[4];
					next_vert = obj.edges[cur_edge].edge[0];
				}
				indices.push_back( vertices.size() );
				vertices.push_back(obj.vertices[ next_vert ].val);

				cur_edge = next_edge;
				if (cur_edge == v.second) {
					break;
				}
			}
			
			f.mIndices = new unsigned int[f.mNumIndices = indices.size()];
			std::copy(indices.begin(),indices.end(),f.mIndices);
		}

		mesh->mVertices = new aiVector3D[mesh->mNumVertices = vertices.size()];
		std::copy(vertices.begin(),vertices.end(),mesh->mVertices);

		if (mesh->mNumVertices) {
			pScene->mMeshes[pScene->mNumMeshes] = mesh;

			(nd->mMeshes = new unsigned int[nd->mNumMeshes=1])[0]=pScene->mNumMeshes++;
		}
	}
}

#endif