assimp/code/FBXImporter.cpp

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

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All rights reserved.

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  following disclaimer.

* Redistributions in binary form must reproduce the above
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*/

/** @file  FBXImporter.cpp
 *  @brief Implementation of the FBX importer.
 */
#include "AssimpPCH.h"

#ifndef ASSIMP_BUILD_NO_FBX_IMPORTER

#include <exception>
#include <iterator>
#include <boost/tuple/tuple.hpp>

#include "FBXImporter.h"

#include "FBXTokenizer.h"
#include "FBXParser.h"
#include "FBXUtil.h"
#include "FBXDocument.h"
#include "FBXConverter.h"

#include "StreamReader.h"
#include "MemoryIOWrapper.h"

namespace Assimp {
	template<> const std::string LogFunctions<FBXImporter>::log_prefix = "FBX: ";
}

using namespace Assimp;
using namespace Assimp::Formatter;
using namespace Assimp::FBX;

namespace {
static const aiImporterDesc desc = {
	"Autodesk FBX Importer",
	"",
	"",
	"",
	aiImporterFlags_SupportTextFlavour,
	0,
	0,
	0,
	0,
	"fbx" 
};
}

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

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

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

	else if ((!extension.length() || checkSig) && pIOHandler)	{
		// at least ascii FBX files usually have a 'FBX' somewhere in their head
		const char* tokens[] = {"FBX"};
		return SearchFileHeaderForToken(pIOHandler,pFile,tokens,1);
	}
	return false;
}

// ------------------------------------------------------------------------------------------------
// List all extensions handled by this loader
const aiImporterDesc* FBXImporter::GetInfo () const
{
	return &desc;
}


// ------------------------------------------------------------------------------------------------
// Setup configuration properties for the loader
void FBXImporter::SetupProperties(const Importer* pImp)
{
	// no tweakables yet
}


// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure. 
void FBXImporter::InternReadFile( const std::string& pFile, 
	aiScene* pScene, IOSystem* pIOHandler)
{
	boost::scoped_ptr<IOStream> stream(pIOHandler->Open(pFile,"rb"));
	if (!stream) {
		ThrowException("Could not open file for reading");
	}

	// read entire file into memory - no streaming for this, fbx
	// files can grow large, but the assimp output data structure
	// then becomes very large, too. Assimp doesn't support
	// streaming for its output data structures so the net win with
	// streaming input data would be very low.
	std::vector<char> contents;
	contents.resize(stream->FileSize());

	stream->Read(&*contents.begin(),contents.size(),1);
	const char* const begin = &*contents.begin();

	// broadphase tokenizing pass in which we identify the core
	// syntax elements of FBX (brackets, commas, key:value mappings)
	TokenList tokens;
	try {
		Tokenize(tokens,begin);

		// use this information to construct a very rudimentary 
		// parse-tree representing the FBX scope structure
		Parser parser(tokens);

		// take the raw parse-tree and convert it to a FBX DOM
		Document doc(parser,settings);

		// convert the FBX DOM to aiScene
		ConvertToAssimpScene(pScene,doc);
	}
	catch(std::exception&) {
		std::for_each(tokens.begin(),tokens.end(),Util::delete_fun<Token>());
		throw;
	}
}

#endif // !ASSIMP_BUILD_NO_FBX_IMPORTER