text: /*
  ---------------------------------------------------------------------------
  Open Asset Import Library (assimp)
  ---------------------------------------------------------------------------
  
  Copyright (c) 2006-2012, assimp 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 
  conditions are met:
  
  * 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
    copyright notice, this list of conditions and the
    following disclaimer in the documentation and/or other
    materials provided with the distribution.
  
  * Neither the name of the assimp team, nor the names of its
    contributors may be used to endorse or promote products
    derived from this software without specific prior
    written permission of the assimp team.
  
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  ---------------------------------------------------------------------------
  */
  
  /** @file  Importer.cpp
   *  @brief Implementation of the CPP-API class #Importer
   */
  
  #include "AssimpPCH.h"
  #include "../include/assimp/version.h"
  
  // ------------------------------------------------------------------------------------------------
  /* Uncomment this line to prevent Assimp from catching unknown exceptions.
   *
   * Note that any Exception except DeadlyImportError may lead to 
   * undefined behaviour -> loaders could remain in an unusable state and
   * further imports with the same Importer instance could fail/crash/burn ...
   */
  // ------------------------------------------------------------------------------------------------
  #ifndef ASSIMP_BUILD_DEBUG
  #	define ASSIMP_CATCH_GLOBAL_EXCEPTIONS
  #endif
  
  // ------------------------------------------------------------------------------------------------
  // Internal headers
  // ------------------------------------------------------------------------------------------------
  #include "Importer.h"
  #include "BaseProcess.h"
  
  #include "DefaultIOStream.h"
  #include "DefaultIOSystem.h"
  #include "DefaultProgressHandler.h"
  #include "GenericProperty.h"
  #include "ProcessHelper.h"
  #include "ScenePreprocessor.h"
  #include "MemoryIOWrapper.h"
  #include "Profiler.h"
  #include "TinyFormatter.h"
  
  #ifndef ASSIMP_BUILD_NO_VALIDATEDS_PROCESS
  #	include "ValidateDataStructure.h"
  #endif
  
  using namespace Assimp::Profiling;
  using namespace Assimp::Formatter;
  
  namespace Assimp {
  	// ImporterRegistry.cpp
  	void GetImporterInstanceList(std::vector< BaseImporter* >& out);
  	// PostStepRegistry.cpp
  	void GetPostProcessingStepInstanceList(std::vector< BaseProcess* >& out);
  }
  
  using namespace Assimp;
  using namespace Assimp::Intern;
  
  // ------------------------------------------------------------------------------------------------
  // Intern::AllocateFromAssimpHeap serves as abstract base class. It overrides
  // new and delete (and their array counterparts) of public API classes (e.g. Logger) to
  // utilize our DLL heap.
  // See http://www.gotw.ca/publications/mill15.htm
  // ------------------------------------------------------------------------------------------------
  void* AllocateFromAssimpHeap::operator new ( size_t num_bytes)	{
  	return ::operator new(num_bytes);
  }
  
  void* AllocateFromAssimpHeap::operator new ( size_t num_bytes, const std::nothrow_t& ) throw()	{
  	try	{
  		return AllocateFromAssimpHeap::operator new( num_bytes );
  	}
  	catch( ... )	{
  		return NULL;
  	}
  }
  
  void AllocateFromAssimpHeap::operator delete ( void* data)	{
  	return ::operator delete(data);
  }
  
  void* AllocateFromAssimpHeap::operator new[] ( size_t num_bytes)	{
  	return ::operator new[](num_bytes);
  }
  
  void* AllocateFromAssimpHeap::operator new[] ( size_t num_bytes, const std::nothrow_t& ) throw() {
  	try	{
  		return AllocateFromAssimpHeap::operator new[]( num_bytes );
  	}
  	catch( ... )	{
  		return NULL;
  	}
  }
  
  void AllocateFromAssimpHeap::operator delete[] ( void* data)	{
  	return ::operator delete[](data);
  }
  
  // ------------------------------------------------------------------------------------------------
  // Importer constructor. 
  Importer::Importer() 
  {
  	// allocate the pimpl first
  	pimpl = new ImporterPimpl();
  
  	pimpl->mScene = NULL;
  	pimpl->mErrorString = "";
  
  	// Allocate a default IO handler
  	pimpl->mIOHandler = new DefaultIOSystem;
  	pimpl->mIsDefaultHandler = true; 
  	pimpl->bExtraVerbose     = false; // disable extra verbose mode by default
  
  	pimpl->mProgressHandler = new DefaultProgressHandler();
  	pimpl->mIsDefaultProgressHandler = true;
  
  	GetImporterInstanceList(pimpl->mImporter);
  	GetPostProcessingStepInstanceList(pimpl->mPostProcessingSteps);
  
  	// Allocate a SharedPostProcessInfo object and store pointers to it in all post-process steps in the list.
  	pimpl->mPPShared = new SharedPostProcessInfo();
  	for (std::vector<BaseProcess*>::iterator it =  pimpl->mPostProcessingSteps.begin();
  		it != pimpl->mPostProcessingSteps.end(); 
  		++it)	{
  
  		(*it)->SetSharedData(pimpl->mPPShared);
  	}
  }
  
  // ------------------------------------------------------------------------------------------------
  // Destructor of Importer
  Importer::~Importer()
  {
  	// Delete all import plugins
  	for( unsigned int a = 0; a < pimpl->mImporter.size(); a++)
  		delete pimpl->mImporter[a];
  
  	// Delete all post-processing plug-ins
  	for( unsigned int a = 0; a < pimpl->mPostProcessingSteps.size(); a++)
  		delete pimpl->mPostProcessingSteps[a];
  
  	// Delete the assigned IO and progress handler
  	delete pimpl->mIOHandler;
  	delete pimpl->mProgressHandler;
  
  	// Kill imported scene. Destructors should do that recursivly
  	delete pimpl->mScene;
  
  	// Delete shared post-processing data
  	delete pimpl->mPPShared;
  
  	// and finally the pimpl itself
  	delete pimpl;
  }
  
  // ------------------------------------------------------------------------------------------------
  // Copy constructor - copies the config of another Importer, not the scene
  Importer::Importer(const Importer &other)
  {
  	new(this) Importer();
  
  	pimpl->mIntProperties    = other.pimpl->mIntProperties;
  	pimpl->mFloatProperties  = other.pimpl->mFloatProperties;
  	pimpl->mStringProperties = other.pimpl->mStringProperties;
  	pimpl->mMatrixProperties = other.pimpl->mMatrixProperties;
  }
  
  // ------------------------------------------------------------------------------------------------
  // Register a custom post-processing step
  aiReturn Importer::RegisterPPStep(BaseProcess* pImp)
  {
  	ai_assert(NULL != pImp);
  	ASSIMP_BEGIN_EXCEPTION_REGION();
  
  		pimpl->mPostProcessingSteps.push_back(pImp);
  		DefaultLogger::get()->info("Registering custom post-processing step");
  	
  	ASSIMP_END_EXCEPTION_REGION(aiReturn);
  	return AI_SUCCESS;
  }
  
  // ------------------------------------------------------------------------------------------------
  // Register a custom loader plugin
  aiReturn Importer::RegisterLoader(BaseImporter* pImp)
  {
  	ai_assert(NULL != pImp);
  	ASSIMP_BEGIN_EXCEPTION_REGION();
  
  	// --------------------------------------------------------------------
  	// Check whether we would have two loaders for the same file extension 
  	// This is absolutely OK, but we should warn the developer of the new
  	// loader that his code will probably never be called if the first 
  	// loader is a bit too lazy in his file checking.
  	// --------------------------------------------------------------------
  	std::set<std::string> st;
  	std::string baked;
  	pImp->GetExtensionList(st);
  
  	for(std::set<std::string>::const_iterator it = st.begin(); it != st.end(); ++it) {
  
  #ifdef ASSIMP_BUILD_DEBUG
  		if (IsExtensionSupported(*it)) {
  			DefaultLogger::get()->warn("The file extension " + *it + " is already in use");
  		}
  #endif
  		baked += *it;
  	}
  
  	// add the loader
  	pimpl->mImporter.push_back(pImp);
  	DefaultLogger::get()->info("Registering custom importer for these file extensions: " + baked);
  	ASSIMP_END_EXCEPTION_REGION(aiReturn);
  	return AI_SUCCESS;
  }
  
  // ------------------------------------------------------------------------------------------------
  // Unregister a custom loader plugin
  aiReturn Importer::UnregisterLoader(BaseImporter* pImp)
  {
  	if(!pImp) {
  		// unregistering a NULL importer is no problem for us ... really!
  		return AI_SUCCESS;
  	}
  
  	ASSIMP_BEGIN_EXCEPTION_REGION();
  	std::vector<BaseImporter*>::iterator it = std::find(pimpl->mImporter.begin(),
  		pimpl->mImporter.end(),pImp);
  
  	if (it != pimpl->mImporter.end())	{
  		pimpl->mImporter.erase(it);
  
  		std::set<std::string> st;
  		pImp->GetExtensionList(st);
  
  		DefaultLogger::get()->info("Unregistering custom importer: ");
  		return AI_SUCCESS;
  	}
  	DefaultLogger::get()->warn("Unable to remove custom importer: I can't find you ...");
  	ASSIMP_END_EXCEPTION_REGION(aiReturn);
  	return AI_FAILURE;
  }
  
  // ------------------------------------------------------------------------------------------------
  // Unregister a custom loader plugin
  aiReturn Importer::UnregisterPPStep(BaseProcess* pImp)
  {
  	if(!pImp) {
  		// unregistering a NULL ppstep is no problem for us ... really!
  		return AI_SUCCESS;
  	}
  
  	ASSIMP_BEGIN_EXCEPTION_REGION();
  	std::vector<BaseProcess*>::iterator it = std::find(pimpl->mPostProcessingSteps.begin(),
  		pimpl->mPostProcessingSteps.end(),pImp);
  
  	if (it != pimpl->mPostProcessingSteps.end())	{
  		pimpl->mPostProcessingSteps.erase(it);
  		DefaultLogger::get()->info("Unregistering custom post-processing step");
  		return AI_SUCCESS;
  	}
  	DefaultLogger::get()->warn("Unable to remove custom post-processing step: I can't find you ..");
  	ASSIMP_END_EXCEPTION_REGION(aiReturn);
  	return AI_FAILURE;
  }
  
  // ------------------------------------------------------------------------------------------------
  // Supplies a custom IO handler to the importer to open and access files.
  void Importer::SetIOHandler( IOSystem* pIOHandler)
  {
  	ASSIMP_BEGIN_EXCEPTION_REGION();
  	// If the new handler is zero, allocate a default IO implementation.
  	if (!pIOHandler)
  	{
  		// Release pointer in the possession of the caller
  		pimpl->mIOHandler = new DefaultIOSystem();
  		pimpl->mIsDefaultHandler = true;
  	}
  	// Otherwise register the custom handler
  	else if (pimpl->mIOHandler != pIOHandler)
  	{
  		delete pimpl->mIOHandler;
  		pimpl->mIOHandler = pIOHandler;
  		pimpl->mIsDefaultHandler = false;
  	}
  	ASSIMP_END_EXCEPTION_REGION(void);
  }
  
  // ------------------------------------------------------------------------------------------------
  // Get the currently set IO handler
  IOSystem* Importer::GetIOHandler() const
  {
  	return pimpl->mIOHandler;
  }
  
  // ------------------------------------------------------------------------------------------------
  // Check whether a custom IO handler is currently set
  bool Importer::IsDefaultIOHandler() const
  {
  	return pimpl->mIsDefaultHandler;
  }
  
  // ------------------------------------------------------------------------------------------------
  // Supplies a custom progress handler to get regular callbacks during importing
  void Importer::SetProgressHandler ( ProgressHandler* pHandler )
  {
  	ASSIMP_BEGIN_EXCEPTION_REGION();
  	// If the new handler is zero, allocate a default implementation.
  	if (!pHandler)
  	{
  		// Release pointer in the possession of the caller
  		pimpl->mProgressHandler = new DefaultProgressHandler();
  		pimpl->mIsDefaultProgressHandler = true;
  	}
  	// Otherwise register the custom handler
  	else if (pimpl->mProgressHandler != pHandler)
  	{
  		delete pimpl->mProgressHandler;
  		pimpl->mProgressHandler = pHandler;
  		pimpl->mIsDefaultProgressHandler = false;
  	}
  	ASSIMP_END_EXCEPTION_REGION(void);
  }
  
  // ------------------------------------------------------------------------------------------------
  // Get the currently set progress handler
  ProgressHandler* Importer::GetProgressHandler() const
  {
  	return pimpl->mProgressHandler;
  }
  
  // ------------------------------------------------------------------------------------------------
  // Check whether a custom progress handler is currently set
  bool Importer::IsDefaultProgressHandler() const
  {
  	return pimpl->mIsDefaultProgressHandler;
  }
  
  // ------------------------------------------------------------------------------------------------
  // Validate post process step flags 
  bool _ValidateFlags(unsigned int pFlags) 
  {
  	if (pFlags & aiProcess_GenSmoothNormals && pFlags & aiProcess_GenNormals)	{
  		DefaultLogger::get()->error("#aiProcess_GenSmoothNormals and #aiProcess_GenNormals are incompatible");
  		return false;
  	}
  	if (pFlags & aiProcess_OptimizeGraph && pFlags & aiProcess_PreTransformVertices)	{
  		DefaultLogger::get()->error("#aiProcess_OptimizeGraph and #aiProcess_PreTransformVertices are incompatible");
  		return false;
  	}
  	return true;
  }
  
  // ------------------------------------------------------------------------------------------------
  // Free the current scene
  void Importer::FreeScene( )
  {
  	ASSIMP_BEGIN_EXCEPTION_REGION();
  	delete pimpl->mScene;
  	pimpl->mScene = NULL;
  
  	pimpl->mErrorString = "";
  	ASSIMP_END_EXCEPTION_REGION(void);
  }
  
  // ------------------------------------------------------------------------------------------------
  // Get the current error string, if any
  const char* Importer::GetErrorString() const 
  { 
  	 /* Must remain valid as long as ReadFile() or FreeFile() are not called */
  	return pimpl->mErrorString.c_str();
  }
  
  // ------------------------------------------------------------------------------------------------
  // Enable extra-verbose mode
  void Importer::SetExtraVerbose(bool bDo)
  {
  	pimpl->bExtraVerbose = bDo;
  }
  
  // ------------------------------------------------------------------------------------------------
  // Get the current scene
  const aiScene* Importer::GetScene() const
  {
  	return pimpl->mScene;
  }
  
  // ------------------------------------------------------------------------------------------------
  // Orphan the current scene and return it.
  aiScene* Importer::GetOrphanedScene()
  {
  	aiScene* s = pimpl->mScene;
  
  	ASSIMP_BEGIN_EXCEPTION_REGION();
  	pimpl->mScene = NULL;
  
  	pimpl->mErrorString = ""; /* reset error string */
  	ASSIMP_END_EXCEPTION_REGION(aiScene*);
  	return s;
  }
  
  // ------------------------------------------------------------------------------------------------
  // Validate post-processing flags
  bool Importer::ValidateFlags(unsigned int pFlags) const
  {
  	ASSIMP_BEGIN_EXCEPTION_REGION();
  	// run basic checks for mutually exclusive flags
  	if(!_ValidateFlags(pFlags)) {
  		return false;
  	}
  
  	// ValidateDS does not anymore occur in the pp list, it plays an awesome extra role ...
  #ifdef ASSIMP_BUILD_NO_VALIDATEDS_PROCESS
  	if (pFlags & aiProcess_ValidateDataStructure) {
  		return false;
  	}
  #endif
  	pFlags &= ~aiProcess_ValidateDataStructure;
  
  	// Now iterate through all bits which are set in the flags and check whether we find at least
  	// one pp plugin which handles it.
  	for (unsigned int mask = 1; mask < (1u << (sizeof(unsigned int)*8-1));mask <<= 1) {
  		
  		if (pFlags & mask) {
  		
  			bool have = false;
  			for( unsigned int a = 0; a < pimpl->mPostProcessingSteps.size(); a++)	{
  				if (pimpl->mPostProcessingSteps[a]-> IsActive(mask) ) {
  				
  					have = true;
  					break;
  				}
  			}
  			if (!have) {
  				return false;
  			}
  		}
  	}
  	ASSIMP_END_EXCEPTION_REGION(bool);
  	return true;
  }
  
  // ------------------------------------------------------------------------------------------------
  const aiScene* Importer::ReadFileFromMemory( const void* pBuffer,
  	size_t pLength,
  	unsigned int pFlags,
  	const char* pHint /*= ""*/)
  {
  	ASSIMP_BEGIN_EXCEPTION_REGION();
  	if (!pHint) {
  		pHint = "";
  	}
  
  	if (!pBuffer || !pLength || strlen(pHint) > 100) {
  		pimpl->mErrorString = "Invalid parameters passed to ReadFileFromMemory()";
  		return NULL;
  	}
  
  	// prevent deletion of the previous IOHandler
  	IOSystem* io = pimpl->mIOHandler;
  	pimpl->mIOHandler = NULL;
  
  	SetIOHandler(new MemoryIOSystem((const uint8_t*)pBuffer,pLength));
  
  	// read the file and recover the previous IOSystem
  	char fbuff[128];
  	sprintf(fbuff,"%s.%s",AI_MEMORYIO_MAGIC_FILENAME,pHint);
  
  	ReadFile(fbuff,pFlags);
  	SetIOHandler(io);
  
  	ASSIMP_END_EXCEPTION_REGION(const aiScene*);
  	return pimpl->mScene;
  }
  
  // ------------------------------------------------------------------------------------------------
  void WriteLogOpening(const std::string& file)
  {
  	Logger* l = DefaultLogger::get();
  	if (!l) {
  		return;
  	}
  	l->info("Load " + file);
  
  	// print a full version dump. This is nice because we don't
  	// need to ask the authors of incoming bug reports for
  	// the library version they're using - a log dump is
  	// sufficient.
  	const unsigned int flags = aiGetCompileFlags();
  	l->debug(format()
  		<< "Assimp "
  		<< aiGetVersionMajor() 
  		<< "." 
  		<< aiGetVersionMinor() 
  		<< "." 
  		<< aiGetVersionRevision()
  
  		<< " "
  #if defined(ASSIMP_BUILD_ARCHITECTURE)
  		<< ASSIMP_BUILD_ARCHITECTURE
  #elif defined(_M_IX86) || defined(__x86_32__) || defined(__i386__)
  		<< "x86"
  #elif defined(_M_X64) || defined(__x86_64__) 
  		<< "amd64"
  #elif defined(_M_IA64) || defined(__ia64__)
  		<< "itanium"
  #elif defined(__ppc__) || defined(__powerpc__)
  		<< "ppc32"
  #elif defined(__powerpc64__)
  		<< "ppc64"
  #elif defined(__arm__)
  		<< "arm"
  #else
  	<< "<unknown architecture>"
  #endif
  
  		<< " "
  #if defined(ASSIMP_BUILD_COMPILER)
  		<< ASSIMP_BUILD_COMPILER
  #elif defined(_MSC_VER)
  		<< "msvc"
  #elif defined(__GNUC__)
  		<< "gcc"
  #else
  		<< "<unknown compiler>"
  #endif
  
  #ifdef ASSIMP_BUILD_DEBUG
  		<< " debug"
  #endif
  
  		<< (flags & ASSIMP_CFLAGS_NOBOOST ? " noboost" : "")
  		<< (flags & ASSIMP_CFLAGS_SHARED  ? " shared" : "")
  		<< (flags & ASSIMP_CFLAGS_SINGLETHREADED  ? " singlethreaded" : "")
  		);
  }
  
  // ------------------------------------------------------------------------------------------------
  // Reads the given file and returns its contents if successful.
  const aiScene* Importer::ReadFile( const char* _pFile, unsigned int pFlags)
  {
  	ASSIMP_BEGIN_EXCEPTION_REGION();
  	const std::string pFile(_pFile);
  
  	// ----------------------------------------------------------------------
  	// Put a large try block around everything to catch all std::exception's
  	// that might be thrown by STL containers or by new(). 
  	// ImportErrorException's are throw by ourselves and caught elsewhere.
  	//-----------------------------------------------------------------------
  
  	WriteLogOpening(pFile);
  
  #ifdef ASSIMP_CATCH_GLOBAL_EXCEPTIONS
  	try
  #endif // ! ASSIMP_CATCH_GLOBAL_EXCEPTIONS
  	{
  		// Check whether this Importer instance has already loaded
  		// a scene. In this case we need to delete the old one
  		if (pimpl->mScene)	{
  
  			DefaultLogger::get()->debug("(Deleting previous scene)");
  			FreeScene();
  		}
  
  		// First check if the file is accessable at all
  		if( !pimpl->mIOHandler->Exists( pFile))	{
  
  			pimpl->mErrorString = "Unable to open file \"" + pFile + "\".";
  			DefaultLogger::get()->error(pimpl->mErrorString);
  			return NULL;
  		}
  
  		boost::scoped_ptr<Profiler> profiler(GetPropertyInteger(AI_CONFIG_GLOB_MEASURE_TIME,0)?new Profiler():NULL);
  		if (profiler) {
  			profiler->BeginRegion("total");
  		}
  
  		// Find an worker class which can handle the file
  		BaseImporter* imp = NULL;
  		for( unsigned int a = 0; a < pimpl->mImporter.size(); a++)	{
  
  			if( pimpl->mImporter[a]->CanRead( pFile, pimpl->mIOHandler, false)) {
  				imp = pimpl->mImporter[a];
  				break;
  			}
  		}
  
  		if (!imp)	{
  			// not so bad yet ... try format auto detection.
  			const std::string::size_type s = pFile.find_last_of('.');
  			if (s != std::string::npos) {
  				DefaultLogger::get()->info("File extension not known, trying signature-based detection");
  				for( unsigned int a = 0; a < pimpl->mImporter.size(); a++)	{
  
  					if( pimpl->mImporter[a]->CanRead( pFile, pimpl->mIOHandler, true)) {
  						imp = pimpl->mImporter[a];
  						break;
  					}
  				}
  			}
  			// Put a proper error message if no suitable importer was found
  			if( !imp)	{
  				pimpl->mErrorString = "No suitable reader found for the file format of file \"" + pFile + "\".";
  				DefaultLogger::get()->error(pimpl->mErrorString);
  				return NULL;
  			}
  		}
  
  		// Get file size for progress handler
  		IOStream * fileIO = pimpl->mIOHandler->Open( pFile );
  		uint32_t fileSize = 0;
  		if (fileIO)
  		{
  			fileSize = fileIO->FileSize();
  			pimpl->mIOHandler->Close( fileIO );
  		}
  
  		// Dispatch the reading to the worker class for this format
  		DefaultLogger::get()->info("Found a matching importer for this file format");
  		pimpl->mProgressHandler->UpdateFileRead( 0, fileSize );
  
  		if (profiler) {
  			profiler->BeginRegion("import");
  		}
  
  		pimpl->mScene = imp->ReadFile( this, pFile, pimpl->mIOHandler);
  		pimpl->mProgressHandler->UpdateFileRead( fileSize, fileSize );
  
  		if (profiler) {
  			profiler->EndRegion("import");
  		}
  
  		// If successful, apply all active post processing steps to the imported data
  		if( pimpl->mScene)	{
  
  #ifndef ASSIMP_BUILD_NO_VALIDATEDS_PROCESS
  			// The ValidateDS process is an exception. It is executed first, even before ScenePreprocessor is called.
  			if (pFlags & aiProcess_ValidateDataStructure)
  			{
  				ValidateDSProcess ds;
  				ds.ExecuteOnScene (this);
  				if (!pimpl->mScene) {
  					return NULL;
  				}
  			}
  #endif // no validation
  
  			// Preprocess the scene and prepare it for post-processing 
  			if (profiler) {
  				profiler->BeginRegion("preprocess");
  			}
  
  			ScenePreprocessor pre(pimpl->mScene);
  			pre.ProcessScene();
  
  			if (profiler) {
  				profiler->EndRegion("preprocess");
  			}
  
  			// Ensure that the validation process won't be called twice
  			ApplyPostProcessing(pFlags & (~aiProcess_ValidateDataStructure));
  		}
  		// if failed, extract the error string
  		else if( !pimpl->mScene) {
  			pimpl->mErrorString = imp->GetErrorText();
  		}
  
  		// clear any data allocated by post-process steps
  		pimpl->mPPShared->Clean();
  
  		if (profiler) {
  			profiler->EndRegion("total");
  		}
  	}
  #ifdef ASSIMP_CATCH_GLOBAL_EXCEPTIONS
  	catch (std::exception &e)
  	{
  #if (defined _MSC_VER) &&	(defined _CPPRTTI) 
  		// if we have RTTI get the full name of the exception that occured
  		pimpl->mErrorString = std::string(typeid( e ).name()) + ": " + e.what();
  #else
  		pimpl->mErrorString = std::string("std::exception: ") + e.what();
  #endif
  
  		DefaultLogger::get()->error(pimpl->mErrorString);
  		delete pimpl->mScene; pimpl->mScene = NULL;
  	}
  #endif // ! ASSIMP_CATCH_GLOBAL_EXCEPTIONS
  
  	// either successful or failure - the pointer expresses it anyways
  	ASSIMP_END_EXCEPTION_REGION(const aiScene*);
  	return pimpl->mScene;
  }
  
  
  // ------------------------------------------------------------------------------------------------
  // Apply post-processing to the currently bound scene
  const aiScene* Importer::ApplyPostProcessing(unsigned int pFlags)
  {
  	ASSIMP_BEGIN_EXCEPTION_REGION();
  	// Return immediately if no scene is active
  	if (!pimpl->mScene) {
  		return NULL;
  	}
  
  	// If no flags are given, return the current scene with no further action
  	if (!pFlags) {
  		return pimpl->mScene;
  	}
  
  	// In debug builds: run basic flag validation
  	ai_assert(_ValidateFlags(pFlags));
  	DefaultLogger::get()->info("Entering post processing pipeline");
  
  #ifndef ASSIMP_BUILD_NO_VALIDATEDS_PROCESS
  	// The ValidateDS process plays an exceptional role. It isn't contained in the global
  	// list of post-processing steps, so we need to call it manually.
  	if (pFlags & aiProcess_ValidateDataStructure)
  	{
  		ValidateDSProcess ds;
  		ds.ExecuteOnScene (this);
  		if (!pimpl->mScene) {
  			return NULL;
  		}
  	}
  #endif // no validation
  #ifdef ASSIMP_BUILD_DEBUG
  	if (pimpl->bExtraVerbose)
  	{
  #ifdef ASSIMP_BUILD_NO_VALIDATEDS_PROCESS
  		DefaultLogger::get()->error("Verbose Import is not available due to build settings");
  #endif  // no validation
  		pFlags |= aiProcess_ValidateDataStructure;
  	}
  #else
  	if (pimpl->bExtraVerbose) {
  		DefaultLogger::get()->warn("Not a debug build, ignoring extra verbose setting");
  	}
  #endif // ! DEBUG
  
  	boost::scoped_ptr<Profiler> profiler(GetPropertyInteger(AI_CONFIG_GLOB_MEASURE_TIME,0)?new Profiler():NULL);
  	for( unsigned int a = 0; a < pimpl->mPostProcessingSteps.size(); a++)	{
  
  		BaseProcess* process = pimpl->mPostProcessingSteps[a];
  		pimpl->mProgressHandler->UpdatePostProcess( a, pimpl->mPostProcessingSteps.size() );
  		if( process->IsActive( pFlags))	{
  
  			if (profiler) {
  				profiler->BeginRegion("postprocess");
  			}
  
  			process->ExecuteOnScene	( this );
  
  			if (profiler) {
  				profiler->EndRegion("postprocess");
  			}
  		}
  		if( !pimpl->mScene) {
  			break; 
  		}
  #ifdef ASSIMP_BUILD_DEBUG
  
  #ifdef ASSIMP_BUILD_NO_VALIDATEDS_PROCESS
  		continue;
  #endif  // no validation
  
  		// If the extra verbose mode is active, execute the ValidateDataStructureStep again - after each step
  		if (pimpl->bExtraVerbose)	{
  			DefaultLogger::get()->debug("Verbose Import: revalidating data structures");
  
  			ValidateDSProcess ds; 
  			ds.ExecuteOnScene (this);
  			if( !pimpl->mScene)	{
  				DefaultLogger::get()->error("Verbose Import: failed to revalidate data structures");
  				break; 
  			}
  		}
  #endif // ! DEBUG
  	}
  	pimpl->mProgressHandler->UpdatePostProcess( pimpl->mPostProcessingSteps.size(), pimpl->mPostProcessingSteps.size() );
  
  	// update private scene flags
    if( pimpl->mScene )
    	ScenePriv(pimpl->mScene)->mPPStepsApplied |= pFlags;
  
  	// clear any data allocated by post-process steps
  	pimpl->mPPShared->Clean();
  	DefaultLogger::get()->info("Leaving post processing pipeline");
  
  	ASSIMP_END_EXCEPTION_REGION(const aiScene*);
  	return pimpl->mScene;
  }
  
  // ------------------------------------------------------------------------------------------------
  // Helper function to check whether an extension is supported by ASSIMP
  bool Importer::IsExtensionSupported(const char* szExtension) const
  {
  	return NULL != GetImporter(szExtension);
  }
  
  // ------------------------------------------------------------------------------------------------
  size_t Importer::GetImporterCount() const
  {
  	return pimpl->mImporter.size();
  }
  
  // ------------------------------------------------------------------------------------------------
  const aiImporterDesc* Importer::GetImporterInfo(size_t index) const
  {
  	if (index >= pimpl->mImporter.size()) {
  		return NULL;
  	}
  	return pimpl->mImporter[index]->GetInfo();
  }
  
  
  // ------------------------------------------------------------------------------------------------
  BaseImporter* Importer::GetImporter (size_t index) const
  {
  	if (index >= pimpl->mImporter.size()) {
  		return NULL;
  	}
  	return pimpl->mImporter[index];
  }
  
  // ------------------------------------------------------------------------------------------------
  // Find a loader plugin for a given file extension
  BaseImporter* Importer::GetImporter (const char* szExtension) const
  {
  	return GetImporter(GetImporterIndex(szExtension));
  }
  
  // ------------------------------------------------------------------------------------------------
  // Find a loader plugin for a given file extension
  size_t Importer::GetImporterIndex (const char* szExtension) const
  {
  	ai_assert(szExtension);
  	ASSIMP_BEGIN_EXCEPTION_REGION();
  
  	// skip over wildcard and dot characters at string head --
  	for(;*szExtension == '*' || *szExtension == '.'; ++szExtension);
  
  	std::string ext(szExtension);
  	if (ext.empty()) {
  		return static_cast<size_t>(-1);
  	}
  	std::transform(ext.begin(),ext.end(), ext.begin(), tolower);
  
  	std::set<std::string> str;
  	for (std::vector<BaseImporter*>::const_iterator i =  pimpl->mImporter.begin();i != pimpl->mImporter.end();++i)	{
  		str.clear();
  
  		(*i)->GetExtensionList(str);
  		for (std::set<std::string>::const_iterator it = str.begin(); it != str.end(); ++it) {
  			if (ext == *it) {
  				return std::distance(static_cast< std::vector<BaseImporter*>::const_iterator >(pimpl->mImporter.begin()), i);
  			}
  		}
  	}
  	ASSIMP_END_EXCEPTION_REGION(size_t);
  	return static_cast<size_t>(-1);
  }
  
  // ------------------------------------------------------------------------------------------------
  // Helper function to build a list of all file extensions supported by ASSIMP
  void Importer::GetExtensionList(aiString& szOut) const
  {
  	ASSIMP_BEGIN_EXCEPTION_REGION();
  	std::set<std::string> str;
  	for (std::vector<BaseImporter*>::const_iterator i =  pimpl->mImporter.begin();i != pimpl->mImporter.end();++i)	{
  		(*i)->GetExtensionList(str);
  	}
  
  	for (std::set<std::string>::const_iterator it = str.begin();; ) {
  		szOut.Append("*.");
  		szOut.Append((*it).c_str());
  
  		if (++it == str.end()) {
  			break;
  		}
  		szOut.Append(";");
  	}
  	ASSIMP_END_EXCEPTION_REGION(void);
  }
  
  // ------------------------------------------------------------------------------------------------
  // Set a configuration property
  void Importer::SetPropertyInteger(const char* szName, int iValue, 
  	bool* bWasExisting /*= NULL*/)
  {
  	ASSIMP_BEGIN_EXCEPTION_REGION();
  		SetGenericProperty<int>(pimpl->mIntProperties, szName,iValue,bWasExisting);	
  	ASSIMP_END_EXCEPTION_REGION(void);
  }
  
  // ------------------------------------------------------------------------------------------------
  // Set a configuration property
  void Importer::SetPropertyFloat(const char* szName, float iValue, 
  	bool* bWasExisting /*= NULL*/)
  {
  	ASSIMP_BEGIN_EXCEPTION_REGION();
  		SetGenericProperty<float>(pimpl->mFloatProperties, szName,iValue,bWasExisting);	
  	ASSIMP_END_EXCEPTION_REGION(void);
  }
  
  // ------------------------------------------------------------------------------------------------
  // Set a configuration property
  void Importer::SetPropertyString(const char* szName, const std::string& value, 
  	bool* bWasExisting /*= NULL*/)
  {
  	ASSIMP_BEGIN_EXCEPTION_REGION();
  		SetGenericProperty<std::string>(pimpl->mStringProperties, szName,value,bWasExisting);	
  	ASSIMP_END_EXCEPTION_REGION(void);
  }
  
  // ------------------------------------------------------------------------------------------------
  // Set a configuration property
  void Importer::SetPropertyMatrix(const char* szName, const aiMatrix4x4& value, 
  	bool* bWasExisting /*= NULL*/)
  {
  	ASSIMP_BEGIN_EXCEPTION_REGION();
  	SetGenericProperty<aiMatrix4x4>(pimpl->mMatrixProperties, szName,value,bWasExisting);	
  	ASSIMP_END_EXCEPTION_REGION(void);
  }
  
  // ------------------------------------------------------------------------------------------------
  // Get a configuration property
  int Importer::GetPropertyInteger(const char* szName, 
  	int iErrorReturn /*= 0xffffffff*/) const
  {
  	return GetGenericProperty<int>(pimpl->mIntProperties,szName,iErrorReturn);
  }
  
  // ------------------------------------------------------------------------------------------------
  // Get a configuration property
  float Importer::GetPropertyFloat(const char* szName, 
  	float iErrorReturn /*= 10e10*/) const
  {
  	return GetGenericProperty<float>(pimpl->mFloatProperties,szName,iErrorReturn);
  }
  
  // ------------------------------------------------------------------------------------------------
  // Get a configuration property
  const std::string Importer::GetPropertyString(const char* szName, 
  	const std::string& iErrorReturn /*= ""*/) const
  {
  	return GetGenericProperty<std::string>(pimpl->mStringProperties,szName,iErrorReturn);
  }
  
  // ------------------------------------------------------------------------------------------------
  // Get a configuration property
  const aiMatrix4x4 Importer::GetPropertyMatrix(const char* szName, 
  	const aiMatrix4x4& iErrorReturn /*= aiMatrix4x4()*/) const
  {
  	return GetGenericProperty<aiMatrix4x4>(pimpl->mMatrixProperties,szName,iErrorReturn);
  }
  
  // ------------------------------------------------------------------------------------------------
  // Get the memory requirements of a single node
  inline void AddNodeWeight(unsigned int& iScene,const aiNode* pcNode)
  {
  	iScene += sizeof(aiNode);
  	iScene += sizeof(unsigned int) * pcNode->mNumMeshes;
  	iScene += sizeof(void*) * pcNode->mNumChildren;
  	
  	for (unsigned int i = 0; i < pcNode->mNumChildren;++i) {
  		AddNodeWeight(iScene,pcNode->mChildren[i]);
  	}
  }
  
  // ------------------------------------------------------------------------------------------------
  // Get the memory requirements of the scene
  void Importer::GetMemoryRequirements(aiMemoryInfo& in) const
  {
  	in = aiMemoryInfo();
  	aiScene* mScene = pimpl->mScene;
  
  	// return if we have no scene loaded
  	if (!pimpl->mScene)
  		return;
  
  
  	in.total = sizeof(aiScene);
  
  	// add all meshes
  	for (unsigned int i = 0; i < mScene->mNumMeshes;++i)
  	{
  		in.meshes += sizeof(aiMesh);
  		if (mScene->mMeshes[i]->HasPositions()) {
  			in.meshes += sizeof(aiVector3D) * mScene->mMeshes[i]->mNumVertices;
  		}
  
  		if (mScene->mMeshes[i]->HasNormals()) {
  			in.meshes += sizeof(aiVector3D) * mScene->mMeshes[i]->mNumVertices;
  		}
  
  		if (mScene->mMeshes[i]->HasTangentsAndBitangents()) {
  			in.meshes += sizeof(aiVector3D) * mScene->mMeshes[i]->mNumVertices * 2;
  		}
  
  		for (unsigned int a = 0; a < AI_MAX_NUMBER_OF_COLOR_SETS;++a) {
  			if (mScene->mMeshes[i]->HasVertexColors(a)) {
  				in.meshes += sizeof(aiColor4D) * mScene->mMeshes[i]->mNumVertices;
  			}
  			else break;
  		}
  		for (unsigned int a = 0; a < AI_MAX_NUMBER_OF_TEXTURECOORDS;++a) {
  			if (mScene->mMeshes[i]->HasTextureCoords(a)) {
  				in.meshes += sizeof(aiVector3D) * mScene->mMeshes[i]->mNumVertices;
  			}
  			else break;
  		}
  		if (mScene->mMeshes[i]->HasBones()) {
  			in.meshes += sizeof(void*) * mScene->mMeshes[i]->mNumBones;
  			for (unsigned int p = 0; p < mScene->mMeshes[i]->mNumBones;++p) {
  				in.meshes += sizeof(aiBone);
  				in.meshes += mScene->mMeshes[i]->mBones[p]->mNumWeights * sizeof(aiVertexWeight);
  			}
  		}
  		in.meshes += (sizeof(aiFace) + 3 * sizeof(unsigned int))*mScene->mMeshes[i]->mNumFaces;
  	}
      in.total += in.meshes;
  
  	// add all embedded textures
  	for (unsigned int i = 0; i < mScene->mNumTextures;++i) {
  		const aiTexture* pc = mScene->mTextures[i];
  		in.textures += sizeof(aiTexture);
  		if (pc->mHeight) {
  			in.textures += 4 * pc->mHeight * pc->mWidth;
  		}
  		else in.textures += pc->mWidth;
  	}
  	in.total += in.textures;
  
  	// add all animations
  	for (unsigned int i = 0; i < mScene->mNumAnimations;++i) {
  		const aiAnimation* pc = mScene->mAnimations[i];
  		in.animations += sizeof(aiAnimation);
  
  		// add all bone anims
  		for (unsigned int a = 0; a < pc->mNumChannels; ++a) {
  			const aiNodeAnim* pc2 = pc->mChannels[i];
  			in.animations += sizeof(aiNodeAnim);
  			in.animations += pc2->mNumPositionKeys * sizeof(aiVectorKey);
  			in.animations += pc2->mNumScalingKeys * sizeof(aiVectorKey);
  			in.animations += pc2->mNumRotationKeys * sizeof(aiQuatKey);
  		}
  	}
  	in.total += in.animations;
  
  	// add all cameras and all lights
  	in.total += in.cameras = sizeof(aiCamera) *  mScene->mNumCameras;
  	in.total += in.lights  = sizeof(aiLight)  *  mScene->mNumLights;
  
  	// add all nodes
  	AddNodeWeight(in.nodes,mScene->mRootNode);
  	in.total += in.nodes;
  
  	// add all materials
  	for (unsigned int i = 0; i < mScene->mNumMaterials;++i) {
  		const aiMaterial* pc = mScene->mMaterials[i];
  		in.materials += sizeof(aiMaterial);
  		in.materials += pc->mNumAllocated * sizeof(void*);
  
  		for (unsigned int a = 0; a < pc->mNumProperties;++a) {
  			in.materials += pc->mProperties[a]->mDataLength;
  		}
  	}
  	in.total += in.materials;
  }
  
  