assimp/code/OFFLoader.cpp

/*
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Open Asset Import Library (ASSIMP)
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*/

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

// internal headers
#include "OFFLoader.h"
#include "MaterialSystem.h"
#include "ParsingUtils.h"
#include "fast_atof.h"

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

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

using namespace Assimp;

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

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

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

	return !(extension.length() != 4 || extension[0] != '.' ||
			 extension[1] != 'o' && extension[1] != 'R' ||
			 extension[2] != 'f' && extension[2] != 'F' ||
			 extension[3] != 'f' && extension[3] != 'F');
}

// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure. 
void OFFImporter::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 OFF file " + pFile + ".");

	unsigned int fileSize = (unsigned int)file->FileSize();

	// allocate storage and copy the contents of the file to a memory buffer
	std::vector<char> mBuffer2(fileSize+1);
	file->Read(&mBuffer2[0], 1, fileSize);
	mBuffer2[fileSize] = '\0';
	const char* buffer = &mBuffer2[0];

	char line[4096];
	GetNextLine(buffer,line);
	if ('O' == line[0])GetNextLine(buffer,line); // skip the 'OFF' line

	const char* sz = line; SkipSpaces(&sz);
	const unsigned int numVertices = strtol10(sz,&sz);SkipSpaces(&sz);
	const unsigned int numFaces = strtol10(sz,&sz);

	pScene->mMeshes = new aiMesh*[ pScene->mNumMeshes = 1 ];
	aiMesh* mesh = pScene->mMeshes[0] = new aiMesh();
	mesh->mNumVertices = numFaces*3;
	aiVector3D* verts = mesh->mVertices = new aiVector3D[mesh->mNumVertices];
	aiFace* faces = mesh->mFaces = new aiFace [mesh->mNumFaces = numFaces];

	std::vector<aiVector3D> tempPositions(numVertices);

	// now read all vertex lines
	for (unsigned int i = 0; i< numVertices;++i)
	{
		if(!GetNextLine(buffer,line))
		{
			DefaultLogger::get()->error("OFF: The number of verts in the header is incorrect");
			break;
		}
		aiVector3D& v = tempPositions[i];

		sz = line; SkipSpaces(&sz);
		sz = fast_atof_move(sz,(float&)v.x); SkipSpaces(&sz);
		sz = fast_atof_move(sz,(float&)v.y); SkipSpaces(&sz);
		fast_atof_move(sz,(float&)v.z);
	}

	// now read all faces lines
	for (unsigned int i = 0, p = 0; i< mesh->mNumFaces;++i)
	{
		if(!GetNextLine(buffer,line))
		{
			DefaultLogger::get()->error("OFF: The number of faces in the header is incorrect");
			break;
		}
		unsigned int idx;sz = line;SkipSpaces(&sz);
		if(!(faces->mNumIndices = strtol10(sz,&sz)) || faces->mNumIndices > 100)
		{
			DefaultLogger::get()->error("OFF: Faces with zero indices aren't allowed");
			--mesh->mNumFaces;
			continue;
		}

		faces->mIndices = new unsigned int [faces->mNumIndices];
		for (unsigned int m = 0; m < faces->mNumIndices;++m)
		{
			SkipSpaces(&sz);
			if ((idx = strtol10(sz,&sz)) >= numVertices)
			{
				DefaultLogger::get()->error("OFF: Vertex index is out of range");
				idx = numVertices-1;
			}

			faces->mIndices[m] = p++;
			*verts++ = tempPositions[idx];
		}
		++faces;
	}
	
	// generate the output node graph
	pScene->mRootNode = new aiNode();
	pScene->mRootNode->mName.Set("<OFFRoot>");
	pScene->mRootNode->mMeshes = new unsigned int [pScene->mRootNode->mNumMeshes = 1];
	pScene->mRootNode->mMeshes[0] = 0;

	// generate a default material
	pScene->mMaterials = new aiMaterial*[pScene->mNumMaterials = 1];
	MaterialHelper* pcMat = new MaterialHelper();

	aiColor4D clr(0.6f,0.6f,0.6f,1.0f);
	pcMat->AddProperty(&clr,1,AI_MATKEY_COLOR_DIFFUSE);
	pScene->mMaterials[0] = pcMat;
}