doom3-bfg/neo/renderer/Model_ColladaParser.cpp

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

Copyright (c) 2006-2012, assimp team
Copyright (C) 2012 Robert Beckebans (id Tech 4 integration)

All rights reserved.

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*/

/** @file ColladaParser.cpp
 *  @brief Implementation of the Collada parser helper
 */

#include "precompiled.h"
#pragma hdrstop

#ifndef ASSIMP_BUILD_NO_DAE_IMPORTER

#include "Model_ColladaParser.h"
//#include "../libs/irrxml/src/fast_atof.h"
//#include "../libs/irrxml/src/ParsingUtils.h"

using namespace Collada;

// ------------------------------------------------------------------------------------------------
// Constructor to be privately used by Importer
ColladaParser::ColladaParser( const char* pFile, ID_TIME_T* sourceTimeStamp )
	: mFileName( pFile )
{
	mRootNode = NULL;
	mUnitSize = 1.0f;
	mUpDirection = UP_Z;

	// We assume the newest file format by default
	mFormat = FV_1_5_n;

	// open the file
	mReader = irr::io::createIrrXMLReader( pFile );
	if( !mReader )
	{
		ThrowException( "Collada: Unable to open file." );
	}

	*sourceTimeStamp = mReader->getTimestamp();

	// start reading
	ReadContents();
}

// ------------------------------------------------------------------------------------------------
// Destructor, private as well
ColladaParser::~ColladaParser()
{
	delete mReader;

	mNodeLibrary.DeleteContents();
	mMeshLibrary.DeleteContents();

	mDataLibrary.DeleteContents();
	mAccessorLibrary.DeleteContents();
	mImageLibrary.DeleteContents();
	mEffectLibrary.DeleteContents();
	mMaterialLibrary.DeleteContents();
	mLightLibrary.DeleteContents();
	mCameraLibrary.DeleteContents();
	mControllerLibrary.DeleteContents();
}

// ------------------------------------------------------------------------------------------------
// Read bool from text contents of current element
bool ColladaParser::ReadBoolFromTextContent()
{
	const char* cur = GetTextContent();
	return ( !idStr::Icmpn( cur, "true", 4 ) || '0' != *cur );
}

// ------------------------------------------------------------------------------------------------
// Read float from text contents of current element
float ColladaParser::ReadFloatFromTextContent()
{
	const char* cur = GetTextContent();

	// RB: FIXME
	//return fast_atof( cur );
	return atof( cur );
}

// ------------------------------------------------------------------------------------------------
// Reads the contents of the file
void ColladaParser::ReadContents()
{
	while( mReader->read() )
	{
		// handle the root element "COLLADA"
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "COLLADA" ) )
			{
				// check for 'version' attribute
				const int attrib = TestAttribute( "version" );
				if( attrib != -1 )
				{
					const char* version = mReader->getAttributeValue( attrib );

					if( !idStr::Cmpn( version, "1.5", 3 ) )
					{
						mFormat =  FV_1_5_n;
						common->Printf( "Collada schema version is 1.5.n\n" );
					}
					else if( !idStr::Cmpn( version, "1.4", 3 ) )
					{
						mFormat =  FV_1_4_n;
						common->Printf( "Collada schema version is 1.4.n\n" );
					}
					else if( !idStr::Cmpn( version, "1.3", 3 ) )
					{
						mFormat =  FV_1_3_n;
						common->Printf( "Collada schema version is 1.3.n\n" );
					}
				}

				ReadStructure();
			}
			else
			{
				common->Printf( "Ignoring global element \"%s\".\n", mReader->getNodeName() );
				SkipElement();
			}
		}
		else
		{
			// skip everything else silently
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Reads the structure of the file
void ColladaParser::ReadStructure()
{
	while( mReader->read() )
	{
		// beginning of elements
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "asset" ) )
			{
				ReadAssetInfo();
			}
			//else if( IsElement( "library_animations" ) )
			//	ReadAnimationLibrary();
			//else if( IsElement( "library_controllers" ) )
			//	ReadControllerLibrary();
			//else if( IsElement( "library_images" ) )
			//	ReadImageLibrary();
			else if( IsElement( "library_materials" ) )
			{
				ReadMaterialLibrary();
			}
			//else if( IsElement( "library_effects" ) )
			//	ReadEffectLibrary();
			else if( IsElement( "library_geometries" ) )
			{
				ReadGeometryLibrary();
			}
			else if( IsElement( "library_visual_scenes" ) )
			{
				ReadSceneLibrary();
			}
			//else if( IsElement( "library_lights" ) )
			//	ReadLightLibrary();
			//else if( IsElement( "library_cameras" ) )
			//	ReadCameraLibrary();
			else if( IsElement( "library_nodes" ) )
			{
				ReadSceneNode( NULL );    /* some hacking to reuse this piece of code */
			}
			else if( IsElement( "scene" ) )
			{
				ReadScene();
			}
			else
			{
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			break;
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Reads asset informations such as coordinate system informations and legal blah
void ColladaParser::ReadAssetInfo()
{
	if( mReader->isEmptyElement() )
	{
		return;
	}

	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "unit" ) )
			{
				// read unit data from the element's attributes
				const int attrIndex = TestAttribute( "meter" );
				if( attrIndex == -1 )
				{
					mUnitSize = 1.f;
				}
				else
				{
					mUnitSize = mReader->getAttributeValueAsFloat( attrIndex );
				}

				// consume the trailing stuff
				if( !mReader->isEmptyElement() )
				{
					SkipElement();
				}
			}
			else if( IsElement( "up_axis" ) )
			{
				// read content, strip whitespace, compare
				const char* content = GetTextContent();
				if( idStr::Cmpn( content, "X_UP", 4 ) == 0 )
				{
					mUpDirection = UP_X;
				}
				else if( idStr::Cmpn( content, "Y_UP", 4 ) == 0 )
				{
					mUpDirection = UP_Y;
				}
				else
				{
					mUpDirection = UP_Z;
				}

				// check element end
				TestClosing( "up_axis" );
			}
			else
			{
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "asset" ) != 0 )
			{
				ThrowException( "Expected end of \"asset\" element." );
			}

			break;
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Reads the animation library
/*
void ColladaParser::ReadAnimationLibrary()
{
	if( mReader->isEmptyElement() )
		return;

	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "animation" ) )
			{
				// delegate the reading. Depending on the inner elements it will be a container or a anim channel
				ReadAnimation( &mAnims );
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "library_animations" ) != 0 )
				ThrowException( "Expected end of \"library_animations\" element." );

			break;
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Reads an animation into the given parent structure
/*
void ColladaParser::ReadAnimation( Collada::Animation* pParent )
{
	if( mReader->isEmptyElement() )
		return;

	// an <animation> element may be a container for grouping sub-elements or an animation channel
	// this is the channel collection by ID, in case it has channels
	typedef idHashTable<AnimationChannel> ChannelMap;
	ChannelMap channels;

	// this is the anim container in case we're a container
	Animation* anim = NULL;

	// optional name given as an attribute
	idStr animName;
	int indexName = TestAttribute( "name" );
	int indexID = TestAttribute( "id" );
	if( indexName >= 0 )
		animName = mReader->getAttributeValue( indexName );
	else if( indexID >= 0 )
		animName = mReader->getAttributeValue( indexID );
	else
		animName = "animation";

	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			// we have subanimations
			if( IsElement( "animation" ) )
			{
				// create container from our element
				if( !anim )
				{
					anim = new Animation;
					anim->mName = animName;
					pParent->mSubAnims.push_back( anim );
				}

				// recurse into the subelement
				ReadAnimation( anim );
			}
			else if( IsElement( "source" ) )
			{
				// possible animation data - we'll never know. Better store it
				ReadSource();
			}
			else if( IsElement( "sampler" ) )
			{
				// read the ID to assign the corresponding collada channel afterwards.
				int indexID = GetAttribute( "id" );
				idStr id = mReader->getAttributeValue( indexID );
				ChannelMap::iterator newChannel = channels.insert( std::make_pair( id, AnimationChannel() ) ).first;

				// have it read into a channel
				ReadAnimationSampler( newChannel->second );
			}
			else if( IsElement( "channel" ) )
			{
				// the binding element whose whole purpose is to provide the target to animate
				// Thanks, Collada! A directly posted information would have been too simple, I guess.
				// Better add another indirection to that! Can't have enough of those.
				int indexTarget = GetAttribute( "target" );
				int indexSource = GetAttribute( "source" );
				const char* sourceId = mReader->getAttributeValue( indexSource );
				if( sourceId[0] == '#' )
					sourceId++;
				ChannelMap::iterator cit = channels.find( sourceId );
				if( cit != channels.end() )
					cit->second.mTarget = mReader->getAttributeValue( indexTarget );

				if( !mReader->isEmptyElement() )
					SkipElement();
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "animation" ) != 0 )
				ThrowException( "Expected end of \"animation\" element." );

			break;
		}
	}

	// it turned out to have channels - add them
	if( !channels.empty() )
	{
		// special filtering for stupid exporters packing each channel into a separate animation
		if( channels.size() == 1 )
		{
			pParent->mChannels.push_back( channels.begin()->second );
		}
		else
		{
			// else create the animation, if not done yet, and store the channels
			if( !anim )
			{
				anim = new Animation;
				anim->mName = animName;
				pParent->mSubAnims.push_back( anim );
			}
			for( ChannelMap::const_iterator it = channels.begin(); it != channels.end(); ++it )
				anim->mChannels.push_back( it->second );
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Reads an animation sampler into the given anim channel
/*
void ColladaParser::ReadAnimationSampler( Collada::AnimationChannel& pChannel )
{
	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "input" ) )
			{
				int indexSemantic = GetAttribute( "semantic" );
				const char* semantic = mReader->getAttributeValue( indexSemantic );
				int indexSource = GetAttribute( "source" );
				const char* source = mReader->getAttributeValue( indexSource );
				if( source[0] != '#' )
					ThrowException( "Unsupported URL format" );
				source++;

				if( strcmp( semantic, "INPUT" ) == 0 )
					pChannel.mSourceTimes = source;
				else if( strcmp( semantic, "OUTPUT" ) == 0 )
					pChannel.mSourceValues = source;

				if( !mReader->isEmptyElement() )
					SkipElement();
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "sampler" ) != 0 )
				ThrowException( "Expected end of \"sampler\" element." );

			break;
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Reads the skeleton controller library
/*
void ColladaParser::ReadControllerLibrary()
{
	if( mReader->isEmptyElement() )
		return;

	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "controller" ) )
			{
				// read ID. Ask the spec if it's neccessary or optional... you might be surprised.
				int attrID = GetAttribute( "id" );
				idStr id = mReader->getAttributeValue( attrID );

				// create an entry and store it in the library under its ID
				mControllerLibrary[id] = Controller();

				// read on from there
				ReadController( mControllerLibrary[id] );
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "library_controllers" ) != 0 )
				ThrowException( "Expected end of \"library_controllers\" element." );

			break;
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Reads a controller into the given mesh structure
/*
void ColladaParser::ReadController( Collada::Controller& pController )
{
	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			// two types of controllers: "skin" and "morph". Only the first one is relevant, we skip the other
			if( IsElement( "morph" ) )
			{
				// should skip everything inside, so there's no danger of catching elements inbetween
				SkipElement();
			}
			else if( IsElement( "skin" ) )
			{
				// read the mesh it refers to. According to the spec this could also be another
				// controller, but I refuse to implement every bullshit idea they've come up with
				int sourceIndex = GetAttribute( "source" );
				pController.mMeshId = mReader->getAttributeValue( sourceIndex ) + 1;
			}
			else if( IsElement( "bind_shape_matrix" ) )
			{
				// content is 16 floats to define a matrix... it seems to be important for some models
				const char* content = GetTextContent();

				// read the 16 floats
				for( unsigned int a = 0; a < 16; a++ )
				{
					// read a number
					content = fast_atoreal_move<float>( content, pController.mBindShapeMatrix[a] );
					// skip whitespace after it
					SkipSpacesAndLineEnd( &content );
				}

				TestClosing( "bind_shape_matrix" );
			}
			else if( IsElement( "source" ) )
			{
				// data array - we have specialists to handle this
				ReadSource();
			}
			else if( IsElement( "joints" ) )
			{
				ReadControllerJoints( pController );
			}
			else if( IsElement( "vertex_weights" ) )
			{
				ReadControllerWeights( pController );
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "controller" ) == 0 )
				break;
			else if( strcmp( mReader->getNodeName(), "skin" ) != 0 )
				ThrowException( "Expected end of \"controller\" element." );
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Reads the joint definitions for the given controller
/*
void ColladaParser::ReadControllerJoints( Collada::Controller& pController )
{
	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			// Input channels for joint data. Two possible semantics: "JOINT" and "INV_BIND_MATRIX"
			if( IsElement( "input" ) )
			{
				int indexSemantic = GetAttribute( "semantic" );
				const char* attrSemantic = mReader->getAttributeValue( indexSemantic );
				int indexSource = GetAttribute( "source" );
				const char* attrSource = mReader->getAttributeValue( indexSource );

				// local URLS always start with a '#'. We don't support global URLs
				if( attrSource[0] != '#' )
					ThrowException( va( "Unsupported URL format in \"%s\"" ) % attrSource ) );
				attrSource++;

				// parse source URL to corresponding source
				if( strcmp( attrSemantic, "JOINT" ) == 0 )
					pController.mJointNameSource = attrSource;
				else if( strcmp( attrSemantic, "INV_BIND_MATRIX" ) == 0 )
					pController.mJointOffsetMatrixSource = attrSource;
				else
					ThrowException( va( "Unknown semantic \"%s\" in joint data" ) % attrSemantic ) );

				// skip inner data, if present
				if( !mReader->isEmptyElement() )
					SkipElement();
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "joints" ) != 0 )
				ThrowException( "Expected end of \"joints\" element." );

			break;
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Reads the joint weights for the given controller
/*
void ColladaParser::ReadControllerWeights( Collada::Controller& pController )
{
	// read vertex count from attributes and resize the array accordingly
	int indexCount = GetAttribute( "count" );
	size_t vertexCount = ( size_t ) mReader->getAttributeValueAsInt( indexCount );
	pController.mWeightCounts.resize( vertexCount );

	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			// Input channels for weight data. Two possible semantics: "JOINT" and "WEIGHT"
			if( IsElement( "input" ) )
			{
				InputChannel channel;

				int indexSemantic = GetAttribute( "semantic" );
				const char* attrSemantic = mReader->getAttributeValue( indexSemantic );
				int indexSource = GetAttribute( "source" );
				const char* attrSource = mReader->getAttributeValue( indexSource );
				int indexOffset = TestAttribute( "offset" );
				if( indexOffset >= 0 )
					channel.mOffset = mReader->getAttributeValueAsInt( indexOffset );

				// local URLS always start with a '#'. We don't support global URLs
				if( attrSource[0] != '#' )
					ThrowException( va( "Unsupported URL format in \"%s\"" ) % attrSource ) );
				channel.mAccessor = attrSource + 1;

				// parse source URL to corresponding source
				if( strcmp( attrSemantic, "JOINT" ) == 0 )
					pController.mWeightInputJoints = channel;
				else if( strcmp( attrSemantic, "WEIGHT" ) == 0 )
					pController.mWeightInputWeights = channel;
				else
					ThrowException( va( "Unknown semantic \"%s\" in vertex_weight data" ) % attrSemantic ) );

				// skip inner data, if present
				if( !mReader->isEmptyElement() )
					SkipElement();
			}
			else if( IsElement( "vcount" ) )
			{
				// read weight count per vertex
				const char* text = GetTextContent();
				size_t numWeights = 0;
				for( idList<size_t>::iterator it = pController.mWeightCounts.begin(); it != pController.mWeightCounts.end(); ++it )
				{
					if( *text == 0 )
						ThrowException( "Out of data while reading vcount" );

					*it = strtoul10( text, &text );
					numWeights += *it;
					SkipSpacesAndLineEnd( &text );
				}

				TestClosing( "vcount" );

				// reserve weight count
				pController.mWeights.resize( numWeights );
			}
			else if( IsElement( "v" ) )
			{
				// read JointIndex - WeightIndex pairs
				const char* text = GetTextContent();

				for( idList< std::pair<size_t, size_t> >::iterator it = pController.mWeights.begin(); it != pController.mWeights.end(); ++it )
				{
					if( *text == 0 )
						ThrowException( "Out of data while reading vertex_weights" );
					it->first = strtoul10( text, &text );
					SkipSpacesAndLineEnd( &text );
					if( *text == 0 )
						ThrowException( "Out of data while reading vertex_weights" );
					it->second = strtoul10( text, &text );
					SkipSpacesAndLineEnd( &text );
				}

				TestClosing( "v" );
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "vertex_weights" ) != 0 )
				ThrowException( "Expected end of \"vertex_weights\" element." );

			break;
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Reads the image library contents
/*
void ColladaParser::ReadImageLibrary()
{
	if( mReader->isEmptyElement() )
		return;

	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "image" ) )
			{
				// read ID. Another entry which is "optional" by design but obligatory in reality
				int attrID = GetAttribute( "id" );
				idStr id = mReader->getAttributeValue( attrID );

				// create an entry and store it in the library under its ID
				Image* image = new Image();
				mImageLibrary.Set( id, image );

				// read on from there
				ReadImage( *image );
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "library_images" ) != 0 )
				ThrowException( "Expected end of \"library_images\" element." );

			break;
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Reads an image entry into the given image
/*
void ColladaParser::ReadImage( Collada::Image& pImage )
{
	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			// Need to run different code paths here, depending on the Collada XSD version
			if( IsElement( "image" ) )
			{
				SkipElement();
			}
			else if( IsElement( "init_from" ) )
			{
				if( mFormat == FV_1_4_n )
				{
					// FIX: C4D exporter writes empty <init_from/> tags
					if( !mReader->isEmptyElement() )
					{
						// element content is filename - hopefully
						const char* sz = TestTextContent();
						if( sz )pImage.mFileName = sz;
						TestClosing( "init_from" );
					}
					if( !pImage.mFileName.Length() )
					{
						pImage.mFileName = "unknown_texture";
					}
				}
				else if( mFormat == FV_1_5_n )
				{
					// make sure we skip over mip and array initializations, which
					// we don't support, but which could confuse the loader if
					// they're not skipped.
					int attrib = TestAttribute( "array_index" );
					if( attrib != -1 && mReader->getAttributeValueAsInt( attrib ) > 0 )
					{
						common->Warning( "Collada: Ignoring texture array index" );
						continue;
					}

					attrib = TestAttribute( "mip_index" );
					if( attrib != -1 && mReader->getAttributeValueAsInt( attrib ) > 0 )
					{
						common->Warning( "Collada: Ignoring MIP map layer" );
						continue;
					}

					// TODO: correctly jump over cube and volume maps?
				}
			}
			else if( mFormat == FV_1_5_n )
			{
				if( IsElement( "ref" ) )
				{
					// element content is filename - hopefully
					const char* sz = TestTextContent();
					if( sz )pImage.mFileName = sz;
					TestClosing( "ref" );
				}
				else if( IsElement( "hex" ) && !pImage.mFileName.Length() )
				{
					// embedded image. get format
					const int attrib = TestAttribute( "format" );
					if( -1 == attrib )
						common->Warning( "Collada: Unknown image file format" );
					else pImage.mEmbeddedFormat = mReader->getAttributeValue( attrib );

					const char* data = GetTextContent();

					// hexadecimal-encoded binary octets. First of all, find the
					// required buffer size to reserve enough storage.
					const char* cur = data;
					while( !IsSpaceOrNewLine( *cur ) ) cur++;

					const unsigned int size = ( unsigned int )( cur - data ) * 2;
					pImage.mImageData.resize( size );
					for( unsigned int i = 0; i < size; ++i )
						pImage.mImageData[i] = HexOctetToDecimal( data + ( i << 1 ) );

					TestClosing( "hex" );
				}
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "image" ) == 0 )
				break;
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Reads the material library
void ColladaParser::ReadMaterialLibrary()
{
	if( mReader->isEmptyElement() )
	{
		return;
	}

	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "material" ) )
			{
				// read ID. By now you propably know my opinion about this "specification"
				int attrID = GetAttribute( "id" );
				idStr id = mReader->getAttributeValue( attrID );

				// create an entry and store it in the library under its ID
				Material* mat = new Material();
				mMaterialLibrary.Set( id.c_str(), mat );
				ReadMaterial( *mat );
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "library_materials" ) != 0 )
			{
				ThrowException( "Expected end of \"library_materials\" element." );
			}

			break;
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Reads the light library
/*
void ColladaParser::ReadLightLibrary()
{
	if( mReader->isEmptyElement() )
		return;

	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "light" ) )
			{
				// read ID. By now you propably know my opinion about this "specification"
				int attrID = GetAttribute( "id" );
				idStr id = mReader->getAttributeValue( attrID );

				// create an entry and store it in the library under its ID
				Light* light = new Light();
				mLightLibrary.Set( id, light );
				ReadLight( *light );

			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "library_lights" ) != 0 )
				ThrowException( "Expected end of \"library_lights\" element." );

			break;
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Reads the camera library
/*
void ColladaParser::ReadCameraLibrary()
{
	if( mReader->isEmptyElement() )
		return;

	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "camera" ) )
			{
				// read ID. By now you propably know my opinion about this "specification"
				int attrID = GetAttribute( "id" );
				idStr id = mReader->getAttributeValue( attrID );

				// create an entry and store it in the library under its ID
				Camera& cam = mCameraLibrary[id];
				attrID = TestAttribute( "name" );
				if( attrID != -1 )
					cam.mName = mReader->getAttributeValue( attrID );

				ReadCamera( cam );
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( idStr::Cmp( mReader->getNodeName(), "library_cameras" ) != 0 )
				ThrowException( "Expected end of \"library_cameras\" element." );

			break;
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Reads a material entry into the given material
void ColladaParser::ReadMaterial( Collada::Material& pMaterial )
{
	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "material" ) )
			{
				SkipElement();
			}
			else if( IsElement( "instance_effect" ) )
			{
				// referred effect by URL
				int attrUrl = GetAttribute( "url" );
				const char* url = mReader->getAttributeValue( attrUrl );
				if( url[0] != '#' )
				{
					ThrowException( "Unknown reference format" );
				}

				pMaterial.mEffect = url + 1;

				SkipElement();
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( idStr::Cmp( mReader->getNodeName(), "material" ) != 0 )
			{
				ThrowException( "Expected end of \"material\" element." );
			}

			break;
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Reads a light entry into the given light
/*
void ColladaParser::ReadLight( Collada::Light& pLight )
{
	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "light" ) )
			{
				SkipElement();
			}
			else if( IsElement( "spot" ) )
			{
				pLight.mType = aiLightSource_SPOT;
			}
			else if( IsElement( "ambient" ) )
			{
				pLight.mType = aiLightSource_AMBIENT;
			}
			else if( IsElement( "directional" ) )
			{
				pLight.mType = aiLightSource_DIRECTIONAL;
			}
			else if( IsElement( "point" ) )
			{
				pLight.mType = aiLightSource_POINT;
			}
			else if( IsElement( "color" ) )
			{
				// text content contains 3 floats
				const char* content = GetTextContent();

				content = fast_atoreal_move<float>( content, ( float& )pLight.mColor.r );
				SkipSpacesAndLineEnd( &content );

				content = fast_atoreal_move<float>( content, ( float& )pLight.mColor.g );
				SkipSpacesAndLineEnd( &content );

				content = fast_atoreal_move<float>( content, ( float& )pLight.mColor.b );
				SkipSpacesAndLineEnd( &content );

				TestClosing( "color" );
			}
			else if( IsElement( "constant_attenuation" ) )
			{
				pLight.mAttConstant = ReadFloatFromTextContent();
				TestClosing( "constant_attenuation" );
			}
			else if( IsElement( "linear_attenuation" ) )
			{
				pLight.mAttLinear = ReadFloatFromTextContent();
				TestClosing( "linear_attenuation" );
			}
			else if( IsElement( "quadratic_attenuation" ) )
			{
				pLight.mAttQuadratic = ReadFloatFromTextContent();
				TestClosing( "quadratic_attenuation" );
			}
			else if( IsElement( "falloff_angle" ) )
			{
				pLight.mFalloffAngle = ReadFloatFromTextContent();
				TestClosing( "falloff_angle" );
			}
			else if( IsElement( "falloff_exponent" ) )
			{
				pLight.mFalloffExponent = ReadFloatFromTextContent();
				TestClosing( "falloff_exponent" );
			}
			// FCOLLADA extensions
			// -------------------------------------------------------
			else if( IsElement( "outer_cone" ) )
			{
				pLight.mOuterAngle = ReadFloatFromTextContent();
				TestClosing( "outer_cone" );
			}
			// ... and this one is even deprecated
			else if( IsElement( "penumbra_angle" ) )
			{
				pLight.mPenumbraAngle = ReadFloatFromTextContent();
				TestClosing( "penumbra_angle" );
			}
			else if( IsElement( "intensity" ) )
			{
				pLight.mIntensity = ReadFloatFromTextContent();
				TestClosing( "intensity" );
			}
			else if( IsElement( "falloff" ) )
			{
				pLight.mOuterAngle = ReadFloatFromTextContent();
				TestClosing( "falloff" );
			}
			else if( IsElement( "hotspot_beam" ) )
			{
				pLight.mFalloffAngle = ReadFloatFromTextContent();
				TestClosing( "hotspot_beam" );
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( idStr::Cmp( mReader->getNodeName(), "light" ) == 0 )
				break;
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Reads a camera entry into the given light
/*
void ColladaParser::ReadCamera( Collada::Camera& pCamera )
{
	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "camera" ) )
			{
				SkipElement();
			}
			else if( IsElement( "orthographic" ) )
			{
				pCamera.mOrtho = true;
			}
			else if( IsElement( "xfov" ) || IsElement( "xmag" ) )
			{
				pCamera.mHorFov = ReadFloatFromTextContent();
				TestClosing( ( pCamera.mOrtho ? "xmag" : "xfov" ) );
			}
			else if( IsElement( "yfov" ) || IsElement( "ymag" ) )
			{
				pCamera.mVerFov = ReadFloatFromTextContent();
				TestClosing( ( pCamera.mOrtho ? "ymag" : "yfov" ) );
			}
			else if( IsElement( "aspect_ratio" ) )
			{
				pCamera.mAspect = ReadFloatFromTextContent();
				TestClosing( "aspect_ratio" );
			}
			else if( IsElement( "znear" ) )
			{
				pCamera.mZNear = ReadFloatFromTextContent();
				TestClosing( "znear" );
			}
			else if( IsElement( "zfar" ) )
			{
				pCamera.mZFar = ReadFloatFromTextContent();
				TestClosing( "zfar" );
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( idStr::Cmp( mReader->getNodeName(), "camera" ) == 0 )
				break;
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Reads the effect library
/*
void ColladaParser::ReadEffectLibrary()
{
	if( mReader->isEmptyElement() )
	{
		return;
	}

	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "effect" ) )
			{
				// read ID. Do I have to repeat my ranting about "optional" attributes?
				// Alex: .... no, not necessary. Please shut up and leave more space for
				// me to complain about the fucking Collada spec with its fucking
				// 'optional' attributes ...
				int attrID = GetAttribute( "id" );
				idStr id = mReader->getAttributeValue( attrID );

				// create an entry and store it in the library under its ID
				Effect* effect = new Effect();

				mEffectLibrary.Set( id, effect );

				// read on from there
				ReadEffect( *effect );
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( idStr::Cmp( mReader->getNodeName(), "library_effects" ) != 0 )
				ThrowException( "Expected end of \"library_effects\" element." );

			break;
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Reads an effect entry into the given effect
/*
void ColladaParser::ReadEffect( Collada::Effect& pEffect )
{
	// for the moment we don't support any other type of effect.
	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "profile_COMMON" ) )
				ReadEffectProfileCommon( pEffect );
			else
				SkipElement();
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( idStr::Cmp( mReader->getNodeName(), "effect" ) != 0 )
				ThrowException( "Expected end of \"effect\" element." );

			break;
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Reads an COMMON effect profile
/*
void ColladaParser::ReadEffectProfileCommon( Collada::Effect& pEffect )
{
	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "newparam" ) )
			{
				// save ID
				int attrSID = GetAttribute( "sid" );
				idStr sid = mReader->getAttributeValue( attrSID );
				pEffect.mParams[sid] = EffectParam();
				ReadEffectParam( pEffect.mParams[sid] );
			}
			else if( IsElement( "technique" ) || IsElement( "extra" ) )
			{
				// just syntactic sugar
			}

			// Shading modes
			else if( IsElement( "phong" ) )
				pEffect.mShadeType = Shade_Phong;
			else if( IsElement( "constant" ) )
				pEffect.mShadeType = Shade_Constant;
			else if( IsElement( "lambert" ) )
				pEffect.mShadeType = Shade_Lambert;
			else if( IsElement( "blinn" ) )
				pEffect.mShadeType = Shade_Blinn;

			// Color + texture properties
			else if( IsElement( "emission" ) )
				ReadEffectColor( pEffect.mEmissive, pEffect.mTexEmissive );
			else if( IsElement( "ambient" ) )
				ReadEffectColor( pEffect.mAmbient, pEffect.mTexAmbient );
			else if( IsElement( "diffuse" ) )
				ReadEffectColor( pEffect.mDiffuse, pEffect.mTexDiffuse );
			else if( IsElement( "specular" ) )
				ReadEffectColor( pEffect.mSpecular, pEffect.mTexSpecular );
			else if( IsElement( "reflective" ) )
			{
				ReadEffectColor( pEffect.mReflective, pEffect.mTexReflective );
			}
			else if( IsElement( "transparent" ) )
			{
				ReadEffectColor( pEffect.mTransparent, pEffect.mTexTransparent );
			}
			else if( IsElement( "shininess" ) )
				ReadEffectFloat( pEffect.mShininess );
			else if( IsElement( "reflectivity" ) )
				ReadEffectFloat( pEffect.mReflectivity );

			// Single scalar properties
			else if( IsElement( "transparency" ) )
				ReadEffectFloat( pEffect.mTransparency );
			else if( IsElement( "index_of_refraction" ) )
				ReadEffectFloat( pEffect.mRefractIndex );

			// GOOGLEEARTH/OKINO extensions
			// -------------------------------------------------------
			else if( IsElement( "double_sided" ) )
				pEffect.mDoubleSided = ReadBoolFromTextContent();

			// FCOLLADA extensions
			// -------------------------------------------------------
			else if( IsElement( "bump" ) )
			{
				idVec4 dummy;
				ReadEffectColor( dummy, pEffect.mTexBump );
			}

			// MAX3D extensions
			// -------------------------------------------------------
			else if( IsElement( "wireframe" ) )
			{
				pEffect.mWireframe = ReadBoolFromTextContent();
				TestClosing( "wireframe" );
			}
			else if( IsElement( "faceted" ) )
			{
				pEffect.mFaceted = ReadBoolFromTextContent();
				TestClosing( "faceted" );
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( idStr::Cmp( mReader->getNodeName(), "profile_COMMON" ) == 0 )
			{
				break;
			}
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Read texture wrapping + UV transform settings from a profile==Maya chunk
/*
void ColladaParser::ReadSamplerProperties( Sampler& out )
{
	if( mReader->isEmptyElement() )
	{
		return;
	}

	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{

			// MAYA extensions
			// -------------------------------------------------------
			if( IsElement( "wrapU" ) )
			{
				out.mWrapU = ReadBoolFromTextContent();
				TestClosing( "wrapU" );
			}
			else if( IsElement( "wrapV" ) )
			{
				out.mWrapV = ReadBoolFromTextContent();
				TestClosing( "wrapV" );
			}
			else if( IsElement( "mirrorU" ) )
			{
				out.mMirrorU = ReadBoolFromTextContent();
				TestClosing( "mirrorU" );
			}
			else if( IsElement( "mirrorV" ) )
			{
				out.mMirrorV = ReadBoolFromTextContent();
				TestClosing( "mirrorV" );
			}
			else if( IsElement( "repeatU" ) )
			{
				out.mTransform.mScaling.x = ReadFloatFromTextContent();
				TestClosing( "repeatU" );
			}
			else if( IsElement( "repeatV" ) )
			{
				out.mTransform.mScaling.y = ReadFloatFromTextContent();
				TestClosing( "repeatV" );
			}
			else if( IsElement( "offsetU" ) )
			{
				out.mTransform.mTranslation.x = ReadFloatFromTextContent();
				TestClosing( "offsetU" );
			}
			else if( IsElement( "offsetV" ) )
			{
				out.mTransform.mTranslation.y = ReadFloatFromTextContent();
				TestClosing( "offsetV" );
			}
			else if( IsElement( "rotateUV" ) )
			{
				out.mTransform.mRotation = ReadFloatFromTextContent();
				TestClosing( "rotateUV" );
			}
			else if( IsElement( "blend_mode" ) )
			{

				const char* sz = GetTextContent();
				// http://www.feelingsoftware.com/content/view/55/72/lang,en/
				// NONE, OVER, IN, OUT, ADD, SUBTRACT, MULTIPLY, DIFFERENCE, LIGHTEN, DARKEN, SATURATE, DESATURATE and ILLUMINATE
				if( 0 == ASSIMP_strincmp( sz, "ADD", 3 ) )
					out.mOp = aiTextureOp_Add;

				else if( 0 == ASSIMP_strincmp( sz, "SUBTRACT", 8 ) )
					out.mOp = aiTextureOp_Subtract;

				else if( 0 == ASSIMP_strincmp( sz, "MULTIPLY", 8 ) )
					out.mOp = aiTextureOp_Multiply;

				else
				{
					common->Warning( "Collada: Unsupported MAYA texture blend mode" );
				}
				TestClosing( "blend_mode" );
			}
			// OKINO extensions
			// -------------------------------------------------------
			else if( IsElement( "weighting" ) )
			{
				out.mWeighting = ReadFloatFromTextContent();
				TestClosing( "weighting" );
			}
			else if( IsElement( "mix_with_previous_layer" ) )
			{
				out.mMixWithPrevious = ReadFloatFromTextContent();
				TestClosing( "mix_with_previous_layer" );
			}
			// MAX3D extensions
			// -------------------------------------------------------
			else if( IsElement( "amount" ) )
			{
				out.mWeighting = ReadFloatFromTextContent();
				TestClosing( "amount" );
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( idStr::Cmp( mReader->getNodeName(), "technique" ) == 0 )
				break;
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Reads an effect entry containing a color or a texture defining that color
/*
void ColladaParser::ReadEffectColor( idVec4& pColor, Sampler& pSampler )
{
	if( mReader->isEmptyElement() )
		return;

	// Save current element name
	const idStr curElem = mReader->getNodeName();

	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "color" ) )
			{
				// text content contains 4 floats
				const char* content = GetTextContent();

				content = fast_atoreal_move<float>( content, ( float& )pColor.r );
				SkipSpacesAndLineEnd( &content );

				content = fast_atoreal_move<float>( content, ( float& )pColor.g );
				SkipSpacesAndLineEnd( &content );

				content = fast_atoreal_move<float>( content, ( float& )pColor.b );
				SkipSpacesAndLineEnd( &content );

				content = fast_atoreal_move<float>( content, ( float& )pColor.a );
				SkipSpacesAndLineEnd( &content );
				TestClosing( "color" );
			}
			else if( IsElement( "texture" ) )
			{
				// get name of source textur/sampler
				int attrTex = GetAttribute( "texture" );
				pSampler.mName = mReader->getAttributeValue( attrTex );

				// get name of UV source channel
				attrTex = GetAttribute( "texcoord" );
				pSampler.mUVChannel = mReader->getAttributeValue( attrTex );
				//SkipElement();
			}
			else if( IsElement( "technique" ) )
			{
				const int _profile = GetAttribute( "profile" );
				const char* profile = mReader->getAttributeValue( _profile );

				// Some extensions are quite useful ... ReadSamplerProperties processes
				// several extensions in MAYA, OKINO and MAX3D profiles.
				if( !::strcmp( profile, "MAYA" ) || !::strcmp( profile, "MAX3D" ) || !::strcmp( profile, "OKINO" ) )
				{
					// get more information on this sampler
					ReadSamplerProperties( pSampler );
				}
				else SkipElement();
			}
			else if( !IsElement( "extra" ) )
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( mReader->getNodeName() == curElem )
				break;
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Reads an effect entry containing a float
/*
void ColladaParser::ReadEffectFloat( float& pFloat )
{
	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "float" ) )
			{
				// text content contains a single floats
				const char* content = GetTextContent();
				content = fast_atoreal_move<float>( content, pFloat );
				SkipSpacesAndLineEnd( &content );

				TestClosing( "float" );
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			break;
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Reads an effect parameter specification of any kind
/*
void ColladaParser::ReadEffectParam( Collada::EffectParam& pParam )
{
	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "surface" ) )
			{
				// image ID given inside <init_from> tags
				TestOpening( "init_from" );
				const char* content = GetTextContent();
				pParam.mType = Param_Surface;
				pParam.mReference = content;
				TestClosing( "init_from" );

				// don't care for remaining stuff
				SkipElement( "surface" );
			}
			else if( IsElement( "sampler2D" ) )
			{
				// surface ID is given inside <source> tags
				TestOpening( "source" );
				const char* content = GetTextContent();
				pParam.mType = Param_Sampler;
				pParam.mReference = content;
				TestClosing( "source" );

				// don't care for remaining stuff
				SkipElement( "sampler2D" );
			}
			else
			{
				// ignore unknown element
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			break;
		}
	}
}
*/

// ------------------------------------------------------------------------------------------------
// Reads the geometry library contents
void ColladaParser::ReadGeometryLibrary()
{
	if( mReader->isEmptyElement() )
	{
		return;
	}

	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "geometry" ) )
			{
				// read ID. Another entry which is "optional" by design but obligatory in reality
				int indexID = GetAttribute( "id" );
				idStr id = mReader->getAttributeValue( indexID );

				// TODO: (thom) support SIDs
				// ai_assert( TestAttribute( "sid") == -1);

				// create a mesh and store it in the library under its ID
				Mesh* mesh = new Mesh;
				mMeshLibrary.Set( id, mesh );

				// read on from there
				ReadGeometry( mesh );
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "library_geometries" ) != 0 )
			{
				ThrowException( "Expected end of \"library_geometries\" element." );
			}

			break;
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Reads a geometry from the geometry library.
void ColladaParser::ReadGeometry( Collada::Mesh* pMesh )
{
	if( mReader->isEmptyElement() )
	{
		return;
	}

	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "mesh" ) )
			{
				// read on from there
				ReadMesh( pMesh );
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "geometry" ) != 0 )
			{
				ThrowException( "Expected end of \"geometry\" element." );
			}

			break;
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Reads a mesh from the geometry library
void ColladaParser::ReadMesh( Mesh* pMesh )
{
	if( mReader->isEmptyElement() )
	{
		return;
	}

	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "source" ) )
			{
				// we have professionals dealing with this
				ReadSource();
			}
			else if( IsElement( "vertices" ) )
			{
				// read per-vertex mesh data
				ReadVertexData( pMesh );
			}
			else if( IsElement( "triangles" ) || IsElement( "lines" ) || IsElement( "linestrips" )
					 || IsElement( "polygons" ) || IsElement( "polylist" ) || IsElement( "trifans" ) || IsElement( "tristrips" ) )
			{
				// read per-index mesh data and faces setup
				ReadIndexData( pMesh );
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "technique_common" ) == 0 )
			{
				// end of another meaningless element - read over it
			}
			else if( strcmp( mReader->getNodeName(), "mesh" ) == 0 )
			{
				// end of <mesh> element - we're done here
				break;
			}
			else
			{
				// everything else should be punished
				ThrowException( "Expected end of \"mesh\" element." );
			}
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Reads a source element
void ColladaParser::ReadSource()
{
	int indexID = GetAttribute( "id" );
	idStr sourceID = mReader->getAttributeValue( indexID );

	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "float_array" ) || IsElement( "IDREF_array" ) || IsElement( "Name_array" ) )
			{
				ReadDataArray();
			}
			else if( IsElement( "technique_common" ) )
			{
				// I don't fucking care for your profiles bullshit
			}
			else if( IsElement( "accessor" ) )
			{
				ReadAccessor( sourceID );
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "source" ) == 0 )
			{
				// end of <source> - we're done
				break;
			}
			else if( strcmp( mReader->getNodeName(), "technique_common" ) == 0 )
			{
				// end of another meaningless element - read over it
			}
			else
			{
				// everything else should be punished
				ThrowException( "Expected end of \"source\" element." );
			}
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Reads a data array holding a number of floats, and stores it in the global library
void ColladaParser::ReadDataArray()
{
	idStr elmName = mReader->getNodeName();
	bool isStringArray = ( elmName == "IDREF_array" || elmName == "Name_array" );
	bool isEmptyElement = mReader->isEmptyElement();

	// read attributes
	int indexID = GetAttribute( "id" );
	idStr id = mReader->getAttributeValue( indexID );
	int indexCount = GetAttribute( "count" );
	unsigned int count = ( unsigned int ) mReader->getAttributeValueAsInt( indexCount );
	const char* content = TestTextContent();

	// read values and store inside an array in the data library
	Data* data = new Data();
	mDataLibrary.Set( id, data );

	data->mIsStringArray = isStringArray;

	// some exporters write empty data arrays, but we need to conserve them anyways because others might reference them
	if( content )
	{
#if 1
		if( isStringArray )
		{
			data->mStrings.AssureSize( count );

			idToken token;
			idLexer lexer( content, idStr::Length( content ), elmName );

			for( unsigned int a = 0; a < count; a++ )
			{
				if( !lexer.ReadToken( &token ) )
				{
					ThrowException( "ColladaParser::ReadDataArray: Expected more values while reading IDREF_array contents." );
					break;
				}

				data->mStrings[a] = token;
			}
		}
		else
		{
			data->mValues.AssureSize( count );

			idToken token;
			idLexer lexer( content, idStr::Length( content ), elmName );

			for( unsigned int a = 0; a < count; a++ )
			{
				bool errorFlag = false;
				float number = lexer.ParseFloat( &errorFlag );

				if( errorFlag )
				{
					ThrowException( "ColladaParser::ReadDataArray: Expected more values while reading float_array contents." );
					break;
				}

				data->mValues[a] = number;
			}
		}

#else
		if( isStringArray )
		{
			data->mStrings.AssureSize( count );
			idStr s;

			for( unsigned int a = 0; a < count; a++ )
			{
				if( *content == 0 )
				{
					ThrowException( "Expected more values while reading IDREF_array contents." );
				}

				s.Clear();

				// ignore space or new line
				char c = *content;
				while( !( idStr::CharIsNewLine( c ) || c == ' ' || c == '\t' || c == '\0' ) )
				{
					s += *content++;
				}
				data->mStrings[a] = s;

				SkipSpacesAndLineEnd( &content );
			}
		}
		else
		{
			data->mValues.AssureSize( count );

			for( unsigned int a = 0; a < count; a++ )
			{
				if( *content == 0 )
				{
					ThrowException( "Expected more values while reading float_array contents." );
				}

				float value;

				// read a number
				content = fast_atoreal_move<float>( content, value );
				data.mValues.push_back( value );

				// skip whitespace after it
				SkipSpacesAndLineEnd( &content );
			}
		}
#endif
	}

	// test for closing tag
	if( !isEmptyElement )
	{
		TestClosing( elmName.c_str() );
	}
}

// ------------------------------------------------------------------------------------------------
// Reads an accessor and stores it in the global library
void ColladaParser::ReadAccessor( const idStr& pID )
{
	// read accessor attributes
	int attrSource = GetAttribute( "source" );
	const char* source = mReader->getAttributeValue( attrSource );
	if( source[0] != '#' )
	{
		ThrowException( va( "Unknown reference format in url \"%s\".", source ) );
	}

	int attrCount = GetAttribute( "count" );
	unsigned int count = ( unsigned int ) mReader->getAttributeValueAsInt( attrCount );

	int attrOffset = TestAttribute( "offset" );
	unsigned int offset = 0;
	if( attrOffset > -1 )
	{
		offset = ( unsigned int ) mReader->getAttributeValueAsInt( attrOffset );
	}

	int attrStride = TestAttribute( "stride" );
	unsigned int stride = 1;
	if( attrStride > -1 )
	{
		stride = ( unsigned int ) mReader->getAttributeValueAsInt( attrStride );
	}

	// store in the library under the given ID
	Accessor* acc = new Accessor();
	mAccessorLibrary.Set( pID, acc );

	acc->mCount = count;
	acc->mOffset = offset;
	acc->mStride = stride;
	acc->mSource = source + 1; // ignore the leading '#'
	acc->mSize = 0; // gets incremented with every param

	// and read the components
	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "param" ) )
			{
				// read data param
				int attrName = TestAttribute( "name" );
				idStr name;
				if( attrName > -1 )
				{
					name = mReader->getAttributeValue( attrName );

					// analyse for common type components and store it's sub-offset in the corresponding field

					/* Cartesian coordinates */
					if( name == "X" )
					{
						acc->mSubOffset[0] = acc->mParams.Num();
					}
					else if( name == "Y" )
					{
						acc->mSubOffset[1] = acc->mParams.Num();
					}
					else if( name == "Z" )
					{
						acc->mSubOffset[2] = acc->mParams.Num();
					}

					/* RGBA colors */
					else if( name == "R" )
					{
						acc->mSubOffset[0] = acc->mParams.Num();
					}
					else if( name == "G" )
					{
						acc->mSubOffset[1] = acc->mParams.Num();
					}
					else if( name == "B" )
					{
						acc->mSubOffset[2] = acc->mParams.Num();
					}
					else if( name == "A" )
					{
						acc->mSubOffset[3] = acc->mParams.Num();
					}

					/* UVWQ (STPQ) texture coordinates */
					else if( name == "S" )
					{
						acc->mSubOffset[0] = acc->mParams.Num();
					}
					else if( name == "T" )
					{
						acc->mSubOffset[1] = acc->mParams.Num();
					}
					else if( name == "P" )
					{
						acc->mSubOffset[2] = acc->mParams.Num();
					}
					//	else if( name == "Q") acc->mSubOffset[3] = acc->mParams.Num();
					/* 4D uv coordinates are not supported in Assimp */

					/* Generic extra data, interpreted as UV data, too*/
					else if( name == "U" )
					{
						acc->mSubOffset[0] = acc->mParams.Num();
					}
					else if( name == "V" )
					{
						acc->mSubOffset[1] = acc->mParams.Num();
					}
					//else
					//	common->Warning( va( "Unknown accessor parameter \"%s\". Ignoring data channel.") % name));
				}

				// read data type
				int attrType = TestAttribute( "type" );
				if( attrType > -1 )
				{
					// for the moment we only distinguish between a 4x4 matrix and anything else.
					// TODO: (thom) I don't have a spec here at work. Check if there are other multi-value types
					// which should be tested for here.
					idStr type = mReader->getAttributeValue( attrType );
					if( type == "float4x4" )
					{
						acc->mSize += 16;
					}
					else
					{
						acc->mSize += 1;
					}
				}

				acc->mParams.Append( name );

				// skip remaining stuff of this element, if any
				SkipElement();
			}
			else
			{
				ThrowException( "Unexpected sub element in tag \"accessor\"." );
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "accessor" ) != 0 )
			{
				ThrowException( "Expected end of \"accessor\" element." );
			}

			break;
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Reads input declarations of per-vertex mesh data into the given mesh
void ColladaParser::ReadVertexData( Mesh* pMesh )
{
	// extract the ID of the <vertices> element. Not that we care, but to catch strange referencing schemes we should warn about
	int attrID = GetAttribute( "id" );
	pMesh->mVertexID = mReader->getAttributeValue( attrID );

	// a number of <input> elements
	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "input" ) )
			{
				ReadInputChannel( pMesh->mPerVertexData );
			}
			else
			{
				ThrowException( "Unexpected sub element in tag \"vertices\"." );
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "vertices" ) != 0 )
			{
				ThrowException( "Expected end of \"vertices\" element." );
			}

			break;
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Reads input declarations of per-index mesh data into the given mesh
void ColladaParser::ReadIndexData( Mesh* pMesh )
{
	idList<size_t> vcount;
	idList<InputChannel> perIndexData;

	// read primitive count from the attribute
	int attrCount = GetAttribute( "count" );
	size_t numPrimitives = ( size_t ) mReader->getAttributeValueAsInt( attrCount );

	// material subgroup
	int attrMaterial = TestAttribute( "material" );
	SubMesh subgroup;
	if( attrMaterial > -1 )
	{
		subgroup.mMaterial = mReader->getAttributeValue( attrMaterial );
	}
	subgroup.mNumFaces = numPrimitives;
	pMesh->mSubMeshes.Append( subgroup );

	// distinguish between polys and triangles
	idStr elementName = mReader->getNodeName();
	PrimitiveType primType = Prim_Invalid;
	if( IsElement( "lines" ) )
	{
		primType = Prim_Lines;
	}
	else if( IsElement( "linestrips" ) )
	{
		primType = Prim_LineStrip;
	}
	else if( IsElement( "polygons" ) )
	{
		primType = Prim_Polygon;
	}
	else if( IsElement( "polylist" ) )
	{
		primType = Prim_Polylist;
	}
	else if( IsElement( "triangles" ) )
	{
		primType = Prim_Triangles;
	}
	else if( IsElement( "trifans" ) )
	{
		primType = Prim_TriFans;
	}
	else if( IsElement( "tristrips" ) )
	{
		primType = Prim_TriStrips;
	}

	assert( primType != Prim_Invalid );

	// also a number of <input> elements, but in addition a <p> primitive collection and propably index counts for all primitives
	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "input" ) )
			{
				ReadInputChannel( perIndexData );
			}
			else if( IsElement( "vcount" ) )
			{
				if( !mReader->isEmptyElement() )
				{
					if( numPrimitives )	// It is possible to define a mesh without any primitives
					{
						// case <polylist> - specifies the number of indices for each polygon
						const char* content = GetTextContent();

						idToken token;
						idLexer lexer( content, idStr::Length( content ), "vcount" );

						vcount.AssureSize( numPrimitives );

						for( unsigned int a = 0; a < numPrimitives; a++ )
						{
							if( !lexer.ReadToken( &token ) )
							{
								ThrowException( "ColladaParser::ReadIndexData: Expected more values while reading vcount contents." );
								break;
							}

							if( token.IsNumeric() )
							{
								vcount[a] = atoi( token );
							}
						}

						/*
						vcount.reserve( numPrimitives );

						for( unsigned int a = 0; a < numPrimitives; a++ )
						{
							if( *content == 0 )
								ThrowException( "Expected more values while reading vcount contents." );

							// read a number
							vcount.push_back( ( size_t ) strtoul10( content, &content ) );

							// skip whitespace after it
							SkipSpacesAndLineEnd( &content );
						}
						*/
					}

					TestClosing( "vcount" );
				}
			}
			else if( IsElement( "p" ) )
			{
				if( !mReader->isEmptyElement() )
				{
					// now here the actual fun starts - these are the indices to construct the mesh data from
					ReadPrimitives( pMesh, perIndexData, numPrimitives, vcount, primType );
				}
			}
			else
			{
				ThrowException( "Unexpected sub element in tag \"vertices\"." );
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( mReader->getNodeName() != elementName )
			{
				ThrowException( va( "Expected end of \"%s\" element.", elementName.c_str() ) );
			}

			break;
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Reads a single input channel element and stores it in the given array, if valid
void ColladaParser::ReadInputChannel( idList<InputChannel>& poChannels )
{
	InputChannel channel;

	// read semantictype filter text
	int attrSemantic = GetAttribute( "semantic" );
	idStr semantic = mReader->getAttributeValue( attrSemantic );
	channel.mType = GetTypeForSemantic( semantic );

	// read source
	int attrSource = GetAttribute( "source" );
	const char* source = mReader->getAttributeValue( attrSource );
	if( source[0] != '#' )
	{
		ThrowException( va( "Unknown reference format in url \"%s\".", source ) );
	}
	channel.mAccessor = source + 1; // skipping the leading #, hopefully the remaining text is the accessor ID only

	// read index offset, if per-index <input>
	int attrOffset = TestAttribute( "offset" );
	if( attrOffset > -1 )
	{
		channel.mOffset = mReader->getAttributeValueAsInt( attrOffset );
	}

	// read set if texture coordinates
	if( channel.mType == IT_Texcoord || channel.mType == IT_Color )
	{
		int attrSet = TestAttribute( "set" );
		if( attrSet > -1 )
		{
			attrSet = mReader->getAttributeValueAsInt( attrSet );
			if( attrSet < 0 )
			{
				ThrowException( va( "Invalid index \"%i\" for set attribute", ( attrSet ) ) );
			}

			channel.mIndex = attrSet;
		}
	}

	// store, if valid type
	if( channel.mType != IT_Invalid )
	{
		poChannels.Append( channel );
	}

	// skip remaining stuff of this element, if any
	SkipElement();
}

// ------------------------------------------------------------------------------------------------
// Reads a <p> primitive index list and assembles the mesh data into the given mesh
void ColladaParser::ReadPrimitives( Mesh* pMesh, idList<InputChannel>& pPerIndexChannels,
									size_t pNumPrimitives, const idList<size_t>& pVCount, PrimitiveType pPrimType )
{
	// determine number of indices coming per vertex
	// find the offset index for all per-vertex channels
	size_t numOffsets = 1;
	size_t perVertexOffset = ( size_t ) - 1; //SIZE_MAX; // invalid value
	for( int i = 0; i < pPerIndexChannels.Num(); i++ )
	{
		const InputChannel& channel = pPerIndexChannels[i];

		numOffsets = Max( numOffsets, channel.mOffset + 1 );
		if( channel.mType == IT_Vertex )
		{
			perVertexOffset = channel.mOffset;
		}
	}

	// determine the expected number of indices
	size_t expectedPointCount = 0;
	switch( pPrimType )
	{
		case Prim_Polylist:
		{
			for( int i = 0; i < pVCount.Num(); i++ )
			{
				expectedPointCount += pVCount[i];
			}
			break;
		}
		case Prim_Lines:
			expectedPointCount = 2 * pNumPrimitives;
			break;
		case Prim_Triangles:
			expectedPointCount = 3 * pNumPrimitives;
			break;
		default:
			// other primitive types don't state the index count upfront... we need to guess
			break;
	}

	// and read all indices into a temporary array
	idList<size_t> indices;
	if( expectedPointCount > 0 )
	{
		indices.AssureSize( expectedPointCount * numOffsets );
	}

	if( pNumPrimitives > 0 )	// It is possible to not contain any indicies
	{
		const char* content = GetTextContent();

		idToken token;
		idLexer lexer( content, idStr::Length( content ), "indices" );

		for( int a = 0; a < indices.Num(); a++ )
		{
			int value = lexer.ParseInt();

			// Hack: (thom) Some exporters put negative indices sometimes. We just try to carry on anyways.
			value = Max( 0, value );

			indices[a] = value;
		}
	}

	// complain if the index count doesn't fit
	if( expectedPointCount > 0 && indices.Num() != expectedPointCount * numOffsets )
	{
		ThrowException( "Expected different index count in <p> element." );
	}

	else if( expectedPointCount == 0 && ( indices.Num() % numOffsets ) != 0 )
	{
		ThrowException( "Expected different index count in <p> element." );
	}

	// find the data for all sources
	for( int i = 0; i < pMesh->mPerVertexData.Num(); i++ )
	{
		const InputChannel& input = pMesh->mPerVertexData[i];
		if( input.mResolved )
		{
			continue;
		}

		// find accessor
		input.mResolved = *ResolveLibraryReference( mAccessorLibrary, input.mAccessor );

		// resolve accessor's data pointer as well, if neccessary
		const Accessor* acc = input.mResolved;
		if( !acc->mData )
		{
			acc->mData = *ResolveLibraryReference( mDataLibrary, acc->mSource );
		}
	}

	// and the same for the per-index channels
	for( int i = 0; i < pPerIndexChannels.Num(); i++ )
	{
		InputChannel& input = pPerIndexChannels[i];
		if( input.mResolved )
		{
			continue;
		}

		// ignore vertex pointer, it doesn't refer to an accessor
		if( input.mType == IT_Vertex )
		{
			// warn if the vertex channel does not refer to the <vertices> element in the same mesh
			if( input.mAccessor != pMesh->mVertexID )
			{
				ThrowException( "Unsupported vertex referencing scheme. I fucking hate Collada." );
			}
			continue;
		}

		// find accessor
		input.mResolved = *ResolveLibraryReference( mAccessorLibrary, input.mAccessor );

		// resolve accessor's data pointer as well, if neccessary
		const Accessor* acc = input.mResolved;
		if( !acc->mData )
		{
			acc->mData = *ResolveLibraryReference( mDataLibrary, acc->mSource );
		}
	}


	// now assemble vertex data according to those indices
	int idx = 0;

	// For continued primitives, the given count does not come all in one <p>, but only one primitive per <p>
	size_t numPrimitives = pNumPrimitives;
	if( pPrimType == Prim_TriFans || pPrimType == Prim_Polygon )
	{
		numPrimitives = 1;
	}

	const int startFaceSize = pMesh->mFaceSize.Num();

	pMesh->mFaceSize.AssureSize( Max( pMesh->mFaceSize.Size(), numPrimitives ) );

	size_t appendedVerts = 0;
	for( size_t a = 0; a < numPrimitives; a++ )
	{
		// determine number of points for this primitive
		size_t numPoints = 0;
		switch( pPrimType )
		{
			case Prim_Lines:
				numPoints = 2;
				break;
			case Prim_Triangles:
				numPoints = 3;
				break;
			case Prim_Polylist:
				numPoints = pVCount[a];
				break;
			case Prim_TriFans:
			case Prim_Polygon:
				numPoints = indices.Num() / numOffsets;
				break;
			default:
				// LineStrip and TriStrip not supported due to expected index unmangling
				ThrowException( "Unsupported primitive type." );
				break;
		}

		// store the face size to later reconstruct the face from
		pMesh->mFaceSize[startFaceSize + a] = numPoints;

		// gather that number of vertices
		for( size_t b = 0; b < numPoints; b++ )
		{
			// read all indices for this vertex. Yes, in a hacky local array
			assert( numOffsets < 20 && perVertexOffset < 20 );

			size_t vindex[20];
			for( size_t offsets = 0; offsets < numOffsets; ++offsets )
			{
				vindex[offsets] = indices[idx++];
			}

			// extract per-vertex channels using the global per-vertex offset
			for( size_t c = 0; c < pMesh->mPerVertexData.Num(); c++ )
			{
				ExtractDataObjectFromChannel( pMesh->mPerVertexData[c], vindex[perVertexOffset], pMesh );
			}

			// and extract per-index channels using there specified offset
			for( size_t c = 0; c < pPerIndexChannels.Num(); c++ )
			{
				const InputChannel& ic = pPerIndexChannels[c];
				ExtractDataObjectFromChannel( ic, vindex[ic.mOffset], pMesh );
			}

			// store the vertex-data index for later assignment of bone vertex weights
			pMesh->mFacePosIndices.Append( vindex[perVertexOffset] );
		}
	}

	// add dummy texcoords if there were no uvmap
	if( pMesh->mTexCoords.Num() < pMesh->mPositions.Num() ) //- 1 )
	{
		int numMissing = pMesh->mPositions.Num() - pMesh->mTexCoords.Num(); // - 1;

		for( int i = 0; i < numMissing; i++ )
		{
			pMesh->mTexCoords.Append( idVec2( 0, 0 ) );
		}
	}

	// if I ever get my hands on that guy who invented this steaming pile of indirection...
	TestClosing( "p" );
}

// ------------------------------------------------------------------------------------------------
// Extracts a single object from an input channel and stores it in the appropriate mesh data array
void ColladaParser::ExtractDataObjectFromChannel( const InputChannel& pInput, size_t pLocalIndex, Mesh* pMesh )
{
	// ignore vertex referrer - we handle them that separate
	if( pInput.mType == IT_Vertex )
	{
		return;
	}

	const Accessor& acc = *pInput.mResolved;
	if( pLocalIndex >= acc.mCount )
	{
		ThrowException( va( "Invalid data index (%" PRIuSIZE "/%" PRIuSIZE ") in primitive specification", pLocalIndex, acc.mCount ) );
	}

	// get a pointer to the start of the data object referred to by the accessor and the local index
	const float* dataObject = &( acc.mData->mValues[0] ) + acc.mOffset + pLocalIndex * acc.mStride;

	// assemble according to the accessors component sub-offset list. We don't care, yet,
	// what kind of object exactly we're extracting here
	float obj[4];
	for( size_t c = 0; c < 4; ++c )
	{
		obj[c] = dataObject[acc.mSubOffset[c]];
	}

	// now we reinterpret it according to the type we're reading here
	switch( pInput.mType )
	{
		case IT_Position: // ignore all position streams except 0 - there can be only one position
			if( pInput.mIndex == 0 )
			{
				pMesh->mPositions.Append( idVec3( obj[0], obj[1], obj[2] ) );
			}
			else
			{
				common->Error( "Collada: just one vertex position stream supported" );
			}
			break;

		case IT_Normal:
			// pad to current vertex count if necessary
			if( pMesh->mNormals.Num() < pMesh->mPositions.Num() - 1 )
			{
				int numMissing = pMesh->mPositions.Num() - pMesh->mNormals.Num() - 1;

				for( int i = 0; i < numMissing; i++ )
				{
					pMesh->mNormals.Append( idVec3( 0, 1, 0 ) );
				}
			}

			// ignore all normal streams except 0 - there can be only one normal
			if( pInput.mIndex == 0 )
			{
				pMesh->mNormals.Append( idVec3( obj[0], obj[1], obj[2] ) );
			}
			else
			{
				common->Error( "Collada: just one vertex normal stream supported" );
			}
			break;

		case IT_Tangent:
			// pad to current vertex count if necessary
			if( pMesh->mTangents.Num() < pMesh->mPositions.Num() - 1 )
			{
				int numMissing = pMesh->mPositions.Num() - pMesh->mTangents.Num() - 1;

				for( int i = 0; i < numMissing; i++ )
				{
					pMesh->mTangents.Append( idVec3( 1, 0, 0 ) );
				}
			}

			// ignore all tangent streams except 0 - there can be only one tangent
			if( pInput.mIndex == 0 )
			{
				pMesh->mTangents.Append( idVec3( obj[0], obj[1], obj[2] ) );
			}
			else
			{
				common->Error( "Collada: just one vertex tangent stream supported" );
			}
			break;

		case IT_Bitangent:
			// pad to current vertex count if necessary
			if( pMesh->mBitangents.Num() < pMesh->mPositions.Num() - 1 )
			{
				int numMissing = pMesh->mPositions.Num() - pMesh->mBitangents.Num() - 1;

				for( int i = 0; i < numMissing; i++ )
				{
					pMesh->mBitangents.Append( idVec3( 0, 0, 1 ) );
				}
			}

			// ignore all bitangent streams except 0 - there can be only one bitangent
			if( pInput.mIndex == 0 )
			{
				pMesh->mBitangents.Append( idVec3( obj[0], obj[1], obj[2] ) );
			}
			else
			{
				common->Error( "Collada: just one vertex bitangent stream supported" );
			}
			break;

		case IT_Texcoord:
			// up to 4 texture coord sets are fine, ignore the others
			if( pInput.mIndex < 1 )
			{
				// pad to current vertex count if necessary
				if( pMesh->mTexCoords.Num() < pMesh->mPositions.Num() - 1 )
				{
					int numMissing = pMesh->mPositions.Num() - pMesh->mTexCoords.Num() - 1;

					for( int i = 0; i < numMissing; i++ )
					{
						pMesh->mTexCoords.Append( idVec2( 0, 0 ) );
					}
				}

				// RB: invert t component
				pMesh->mTexCoords.Append( idVec2( obj[0], 1.0f - obj[1] ) ); //, obj[2] ) );

				/*
				if( pMesh->mTexCoords[pInput.mIndex].Num() < pMesh->mPositions.Num() - 1 )
				{
					pMesh->mTexCoords[pInput.mIndex].insert( pMesh->mTexCoords[pInput.mIndex].end(),
							pMesh->mPositions.size() - pMesh->mTexCoords[pInput.mIndex].size() - 1, idVec3( 0, 0, 0 ) );
				}

				pMesh->mTexCoords[pInput.mIndex].push_back( idVec3( obj[0], obj[1], obj[2] ) );
				if( 0 != acc.mSubOffset[2] || 0 != acc.mSubOffset[3] ) // hack ... consider cleaner solution
					pMesh->mNumUVComponents[pInput.mIndex] = 3;
					*/
			}
			else
			{
				common->Error( "Collada: too many texture coordinate sets. Skipping." );
			}
			break;

		case IT_Color:
			// up to 4 color sets are fine, ignore the others
			if( pInput.mIndex < 1 )
			{
				// pad to current vertex count if necessary
				if( pMesh->mColors.Num() < pMesh->mPositions.Num() - 1 )
				{
					int numMissing = pMesh->mPositions.Num() - pMesh->mColors.Num() - 1;

					for( int i = 0; i < numMissing; i++ )
					{
						pMesh->mColors.Append( PackColor( idVec4( 0, 0, 0, 1 ) ) );
					}
				}

				pMesh->mColors.Append( PackColor( idVec4( obj[0], obj[1], obj[2], obj[3] ) ) );

				/*
				if( pMesh->mColors[pInput.mIndex].size() < pMesh->mPositions.size() - 1 )
					pMesh->mColors[pInput.mIndex].insert( pMesh->mColors[pInput.mIndex].end(),
														  pMesh->mPositions.size() - pMesh->mColors[pInput.mIndex].size() - 1, idVec4( 0, 0, 0, 1 ) );

				pMesh->mColors[pInput.mIndex].push_back( idVec4( obj[0], obj[1], obj[2], obj[3] ) );
				*/
			}
			else
			{
				common->Error( "Collada: too many vertex color sets. Skipping." );
			}

			break;

		default:
			// IT_Invalid and IT_Vertex
			assert( false && "shouldn't ever get here" );
	}
}

// ------------------------------------------------------------------------------------------------
// Reads the library of node hierarchies and scene parts
void ColladaParser::ReadSceneLibrary()
{
	if( mReader->isEmptyElement() )
	{
		return;
	}

	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			// a visual scene - generate root node under its ID and let ReadNode() do the recursive work
			if( IsElement( "visual_scene" ) )
			{
				// read ID. Is optional according to the spec, but how on earth should a scene_instance refer to it then?
				int indexID = GetAttribute( "id" );
				const char* attrID = mReader->getAttributeValue( indexID );

				// read name if given.
				int indexName = TestAttribute( "name" );
				const char* attrName = "unnamed";
				if( indexName > -1 )
				{
					attrName = mReader->getAttributeValue( indexName );
				}

				// create a node and store it in the library under its ID
				Node* node = new Node;
				node->mID = attrID;
				node->mName = attrName;

				mNodeLibrary.Set( node->mID, node );

				ReadSceneNode( node );
			}
			else
			{
				// ignore the rest
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "library_visual_scenes" ) == 0 )
				//ThrowException( "Expected end of \"library_visual_scenes\" element.");

			{
				break;
			}
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Reads a scene node's contents including children and stores it in the given node
void ColladaParser::ReadSceneNode( Node* pNode )
{
	// quit immediately on <bla/> elements
	if( mReader->isEmptyElement() )
	{
		return;
	}

	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "node" ) )
			{
				Node* child = new Node;
				int attrID = TestAttribute( "id" );
				if( attrID > -1 )
				{
					child->mID = mReader->getAttributeValue( attrID );
				}
				int attrSID = TestAttribute( "sid" );
				if( attrSID > -1 )
				{
					child->mSID = mReader->getAttributeValue( attrSID );
				}

				int attrName = TestAttribute( "name" );
				if( attrName > -1 )
				{
					child->mName = mReader->getAttributeValue( attrName );
				}

				// TODO: (thom) support SIDs
				// ai_assert( TestAttribute( "sid") == -1);

				if( pNode )
				{
					pNode->mChildren.Append( child );
					child->mParent = pNode;
				}
				else
				{
					// no parent node given, probably called from <library_nodes> element.
					// create new node in node library
					//mNodeLibrary.Set( child->mID, child );
				}

				mNodeLibrary.Set( child->mID, child );

				// read on recursively from there
				ReadSceneNode( child );
				continue;
			}
			// For any further stuff we need a valid node to work on
			else if( !pNode )
			{
				continue;
			}

			if( IsElement( "lookat" ) )
			{
				ReadNodeTransformation( pNode, TF_LOOKAT );
			}
			else if( IsElement( "matrix" ) )
			{
				ReadNodeTransformation( pNode, TF_MATRIX );
			}
			else if( IsElement( "rotate" ) )
			{
				ReadNodeTransformation( pNode, TF_ROTATE );
			}
			else if( IsElement( "scale" ) )
			{
				ReadNodeTransformation( pNode, TF_SCALE );
			}
			else if( IsElement( "skew" ) )
			{
				ReadNodeTransformation( pNode, TF_SKEW );
			}
			else if( IsElement( "translate" ) )
			{
				ReadNodeTransformation( pNode, TF_TRANSLATE );
			}
			else if( IsElement( "render" ) && pNode->mParent == NULL && 0 == pNode->mPrimaryCamera.Length() )
			{
				// ... scene evaluation or, in other words, postprocessing pipeline,
				// or, again in other words, a turing-complete description how to
				// render a Collada scene. The only thing that is interesting for
				// us is the primary camera.
				int attrId = TestAttribute( "camera_node" );
				if( -1 != attrId )
				{
					const char* s = mReader->getAttributeValue( attrId );
					if( s[0] != '#' )
					{
						common->Error( "Collada: Unresolved reference format of camera" );
					}
					else
					{
						pNode->mPrimaryCamera = s + 1;
					}
				}
			}
			else if( IsElement( "instance_node" ) )
			{
				// find the node in the library
				int attrID = TestAttribute( "url" );
				if( attrID != -1 )
				{
					const char* s = mReader->getAttributeValue( attrID );
					if( s[0] != '#' )
					{
						common->Error( "Collada: Unresolved reference format of node" );
					}
					else
					{
						NodeInstance nodeInstance;
						nodeInstance.mNode = s + 1;

						pNode->mNodeInstances.Append( nodeInstance );
					}
				}
			}
			else if( IsElement( "instance_geometry" ) || IsElement( "instance_controller" ) )
			{
				// Reference to a mesh or controller, with possible material associations
				ReadNodeGeometry( pNode );
			}
			else if( IsElement( "instance_light" ) )
			{
				// Reference to a light, name given in 'url' attribute
				int attrID = TestAttribute( "url" );
				if( -1 == attrID )
				{
					common->Warning( "Collada: Expected url attribute in <instance_light> element" );
				}
				else
				{
					const char* url = mReader->getAttributeValue( attrID );
					if( url[0] != '#' )
					{
						ThrowException( "Unknown reference format in <instance_light> element" );
					}

					LightInstance lightInstance;
					lightInstance.mLight = url + 1;

					pNode->mLights.Append( lightInstance );
				}
			}
			else if( IsElement( "instance_camera" ) )
			{
				// Reference to a camera, name given in 'url' attribute
				int attrID = TestAttribute( "url" );
				if( -1 == attrID )
				{
					common->Warning( "Collada: Expected url attribute in <instance_camera> element" );
				}
				else
				{
					const char* url = mReader->getAttributeValue( attrID );
					if( url[0] != '#' )
					{
						ThrowException( "Unknown reference format in <instance_camera> element" );
					}

					CameraInstance cameraInstance;
					cameraInstance.mCamera = url + 1;

					pNode->mCameras.Append( cameraInstance );
				}
			}
			else
			{
				// skip everything else for the moment
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			break;
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Reads a node transformation entry of the given type and adds it to the given node's transformation list.
void ColladaParser::ReadNodeTransformation( Node* pNode, TransformType pType )
{
	if( mReader->isEmptyElement() )
	{
		return;
	}

	idStr tagName = mReader->getNodeName();

	Transform tf;
	tf.mType = pType;

	// read SID
	int indexSID = TestAttribute( "sid" );
	if( indexSID >= 0 )
	{
		tf.mID = mReader->getAttributeValue( indexSID );
	}

	// how many parameters to read per transformation type
	static const unsigned int sNumParameters[] = { 9, 4, 3, 3, 7, 16 };
	const char* content = GetTextContent();

	idToken token;
	idLexer lexer( content, idStr::Length( content ), "sid" );

	// read as many parameters and store in the transformation
	for( unsigned int a = 0; a < sNumParameters[pType]; a++ )
	{
		float number = lexer.ParseFloat();

		tf.f[a] = number;

		// read a number
		//content = fast_atoreal_move<float>( content, tf.f[a] );

		// skip whitespace after it
		//SkipSpacesAndLineEnd( &content );
	}

	// place the transformation at the queue of the node
	pNode->mTransforms.Append( tf );

	// and consume the closing tag
	TestClosing( tagName.c_str() );
}

// ------------------------------------------------------------------------------------------------
// Processes bind_vertex_input and bind elements
void ColladaParser::ReadMaterialVertexInputBinding( Collada::SemanticMappingTable& tbl )
{
	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "bind_vertex_input" ) )
			{
				Collada::InputSemanticMapEntry vn;

				// effect semantic
				int n = GetAttribute( "semantic" );
				idStr s = mReader->getAttributeValue( n );

				// input semantic
				n = GetAttribute( "input_semantic" );
				vn.mType = GetTypeForSemantic( mReader->getAttributeValue( n ) );

				// index of input set
				n = TestAttribute( "input_set" );
				if( -1 != n )
				{
					vn.mSet = mReader->getAttributeValueAsInt( n );
				}

				tbl.mMap.Set( s, vn );
			}
			else if( IsElement( "bind" ) )
			{
				common->Warning( "Collada: Found unsupported <bind> element" );
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			if( strcmp( mReader->getNodeName(), "instance_material" ) == 0 )
			{
				break;
			}
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Reads a mesh reference in a node and adds it to the node's mesh list
void ColladaParser::ReadNodeGeometry( Node* pNode )
{
	// referred mesh is given as an attribute of the <instance_geometry> element
	int attrUrl = GetAttribute( "url" );
	const char* url = mReader->getAttributeValue( attrUrl );
	if( url[0] != '#' )
	{
		ThrowException( "Unknown reference format" );
	}

	Collada::MeshInstance instance;
	instance.mMeshOrController = url + 1; // skipping the leading #

	if( !mReader->isEmptyElement() )
	{
		// read material associations. Ignore additional elements inbetween
		while( mReader->read() )
		{
			if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
			{
				if( IsElement( "instance_material" ) )
				{
					// read ID of the geometry subgroup and the target material
					int attrGroup = GetAttribute( "symbol" );
					idStr group = mReader->getAttributeValue( attrGroup );

					int attrMaterial = GetAttribute( "target" );
					const char* urlMat = mReader->getAttributeValue( attrMaterial );
					Collada::SemanticMappingTable s;
					if( urlMat[0] == '#' )
					{
						urlMat++;
					}

					s.mMatName = urlMat;

					// resolve further material details + THIS UGLY AND NASTY semantic mapping stuff
					if( !mReader->isEmptyElement() )
					{
						ReadMaterialVertexInputBinding( s );
					}

					// store the association
					//instance.mMaterials.Set( group, s );
					instance.mMaterials.Append( s.mMatName );
				}
			}
			else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
			{
				if( strcmp( mReader->getNodeName(), "instance_geometry" ) == 0
						|| strcmp( mReader->getNodeName(), "instance_controller" ) == 0 )
				{
					break;
				}
			}
		}
	}

	// store it
	pNode->mMeshes.Append( instance );
}

// ------------------------------------------------------------------------------------------------
// Reads the collada scene
void ColladaParser::ReadScene()
{
	if( mReader->isEmptyElement() )
	{
		return;
	}

	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT )
		{
			if( IsElement( "instance_visual_scene" ) )
			{
				// should be the first and only occurence
				if( mRootNode )
				{
					ThrowException( "Invalid scene containing multiple root nodes" );
				}

				// read the url of the scene to instance. Should be of format "#some_name"
				int urlIndex = GetAttribute( "url" );
				const char* url = mReader->getAttributeValue( urlIndex );
				if( url[0] != '#' )
				{
					ThrowException( "Unknown reference format" );
				}

				// find the referred scene, skip the leading #
				Node** node = NULL;

				if( !mNodeLibrary.Get( url + 1, &node ) )
				{
					ThrowException( "Unable to resolve visual_scene reference \"" + idStr( url ) + "\"." );
				}
				mRootNode = *node;
			}
			else
			{
				SkipElement();
			}
		}
		else if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
		{
			break;
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Aborts the file reading with an exception
void ColladaParser::ThrowException( const idStr& pError ) const
{
#if defined(USE_EXCEPTIONS)
	throw idException( va( "Collada: %s - %s", mFileName.c_str(), pError.c_str() ) );
#else
	common->FatalError( "%s", va( "Collada: %s - %s", mFileName.c_str(), pError.c_str() ) );
#endif
}

// ------------------------------------------------------------------------------------------------
// Skips all data until the end node of the current element
void ColladaParser::SkipElement()
{
	// nothing to skip if it's an <element />
	if( mReader->isEmptyElement() )
	{
		return;
	}

	// reroute
	SkipElement( mReader->getNodeName() );
}

// ------------------------------------------------------------------------------------------------
// Skips all data until the end node of the given element
void ColladaParser::SkipElement( const char* pElement )
{
	// copy the current node's name because it'a pointer to the reader's internal buffer,
	// which is going to change with the upcoming parsing
	idStr element = pElement;
	while( mReader->read() )
	{
		if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END )
			if( mReader->getNodeName() == element )
			{
				break;
			}
	}
}

// ------------------------------------------------------------------------------------------------
// Tests for an opening element of the given name, throws an exception if not found
void ColladaParser::TestOpening( const char* pName )
{
	// read element start
	if( !mReader->read() )
	{
		ThrowException( va( "Unexpected end of file while beginning of \"%s\" element.", pName ) );
	}

	// whitespace in front is ok, just read again if found
	if( mReader->getNodeType() == irr::io::EXN_TEXT )
		if( !mReader->read() )
		{
			ThrowException( va( "Unexpected end of file while reading beginning of \"%s\" element.", pName ) );
		}

	if( mReader->getNodeType() != irr::io::EXN_ELEMENT || strcmp( mReader->getNodeName(), pName ) != 0 )
	{
		ThrowException( va( "Expected start of \"%s\" element.", pName ) );
	}
}

// ------------------------------------------------------------------------------------------------
// Tests for the closing tag of the given element, throws an exception if not found
void ColladaParser::TestClosing( const char* pName )
{
	// check if we're already on the closing tag and return right away
	if( mReader->getNodeType() == irr::io::EXN_ELEMENT_END && strcmp( mReader->getNodeName(), pName ) == 0 )
	{
		return;
	}

	// if not, read some more
	if( !mReader->read() )
	{
		ThrowException( va( "Unexpected end of file while reading end of \"%s\" element.", pName ) );
	}

	// whitespace in front is ok, just read again if found
	if( mReader->getNodeType() == irr::io::EXN_TEXT )
		if( !mReader->read() )
		{
			ThrowException( va( "Unexpected end of file while reading end of \"%s\" element.", pName ) );
		}

	// but this has the be the closing tag, or we're lost
	if( mReader->getNodeType() != irr::io::EXN_ELEMENT_END || strcmp( mReader->getNodeName(), pName ) != 0 )
	{
		ThrowException( va( "Expected end of \"%s\" element.", pName ) );
	}
}

// ------------------------------------------------------------------------------------------------
// Returns the index of the named attribute or -1 if not found. Does not throw, therefore useful for optional attributes
int ColladaParser::GetAttribute( const char* pAttr ) const
{
	int index = TestAttribute( pAttr );
	if( index != -1 )
	{
		return index;
	}

	// attribute not found -> throw an exception
	ThrowException( va( "Expected attribute \"%s\" at element \"%s\".", pAttr, mReader->getNodeName() ) );
	return -1;
}

// ------------------------------------------------------------------------------------------------
// Tests the present element for the presence of one attribute, returns its index or throws an exception if not found
int ColladaParser::TestAttribute( const char* pAttr ) const
{
	for( int a = 0; a < mReader->getAttributeCount(); a++ )
		if( strcmp( mReader->getAttributeName( a ), pAttr ) == 0 )
		{
			return a;
		}

	return -1;
}

// ------------------------------------------------------------------------------------------------
// Reads the text contents of an element, throws an exception if not given. Skips leading whitespace.
const char* ColladaParser::GetTextContent()
{
	const char* sz = TestTextContent();
	if( !sz )
	{
		ThrowException( "Invalid contents in element \"n\"." );
	}
	return sz;
}

// ------------------------------------------------------------------------------------------------
// Reads the text contents of an element, returns NULL if not given. Skips leading whitespace.
const char* ColladaParser::TestTextContent()
{
	// present node should be the beginning of an element
	if( mReader->getNodeType() != irr::io::EXN_ELEMENT || mReader->isEmptyElement() )
	{
		return NULL;
	}

	// read contents of the element
	if( !mReader->read() )
	{
		return NULL;
	}
	if( mReader->getNodeType() != irr::io::EXN_TEXT )
	{
		return NULL;
	}

	// skip leading whitespace
	const char* text = mReader->getNodeData();
	//SkipSpacesAndLineEnd( &text );

	return text;
}

// ------------------------------------------------------------------------------------------------
// Calculates the resulting transformation fromm all the given transform steps
idMat4 ColladaParser::CalculateResultTransform( const idList<Transform>& pTransforms ) const
{
	idMat4 res;
	res.Identity();

	for( int i = 0; i < pTransforms.Num(); i++ )
	{
		const Transform& tf = pTransforms[i];
		switch( tf.mType )
		{
			case TF_LOOKAT:
			{
				idVec3 pos( tf.f[0], tf.f[1], tf.f[2] );
				idVec3 dstPos( tf.f[3], tf.f[4], tf.f[5] );
				idVec3 up = idVec3( tf.f[6], tf.f[7], tf.f[8] );
				up.Normalize();
				idVec3 dir = idVec3( dstPos - pos );
				dir.Normalize();
				idVec3 right = dir.Cross( up );
				right.Normalize();

				res *= idMat4(
						   right.x, up.x, -dir.x, pos.x,
						   right.y, up.y, -dir.y, pos.y,
						   right.z, up.z, -dir.z, pos.z,
						   0, 0, 0, 1 );
				break;
			}
			case TF_ROTATE:
			{
				float angle = tf.f[3];
				idVec3 axis( tf.f[0], tf.f[1], tf.f[2] );
				idRotation rot( vec3_origin, axis, angle );
				res *= rot.ToMat4();
				break;
			}
			case TF_TRANSLATE:
			{
				idMat4 trans;
				trans.Identity();

				trans[0][3] = tf.f[0];
				trans[1][3] = tf.f[1];
				trans[2][3] = tf.f[2];

				res *= trans;
				break;
			}
			case TF_SCALE:
			{
				idMat4 scale( tf.f[0], 0.0f, 0.0f, 0.0f, 0.0f, tf.f[1], 0.0f, 0.0f, 0.0f, 0.0f, tf.f[2], 0.0f,
							  0.0f, 0.0f, 0.0f, 1.0f );
				res *= scale;
				break;
			}
			case TF_SKEW:
				// TODO: (thom)
				assert( false );
				break;
			case TF_MATRIX:
			{
				idMat4 mat( tf.f[0], tf.f[1], tf.f[2], tf.f[3], tf.f[4], tf.f[5], tf.f[6], tf.f[7],
							tf.f[8], tf.f[9], tf.f[10], tf.f[11], tf.f[12], tf.f[13], tf.f[14], tf.f[15] );
				res *= mat;
				break;
			}
			default:
				assert( false );
				break;
		}
	}

	return res;
}

// ------------------------------------------------------------------------------------------------
// Determines the input data type for the given semantic string
Collada::InputType ColladaParser::GetTypeForSemantic( const idStr& pSemantic )
{
	if( pSemantic == "POSITION" )
	{
		return IT_Position;
	}
	else if( pSemantic == "TEXCOORD" )
	{
		return IT_Texcoord;
	}
	else if( pSemantic == "NORMAL" )
	{
		return IT_Normal;
	}
	else if( pSemantic == "COLOR" )
	{
		return IT_Color;
	}
	else if( pSemantic == "VERTEX" )
	{
		return IT_Vertex;
	}
	else if( pSemantic == "BINORMAL" || pSemantic ==  "TEXBINORMAL" )
	{
		return IT_Bitangent;
	}
	else if( pSemantic == "TANGENT" || pSemantic == "TEXTANGENT" )
	{
		return IT_Tangent;
	}

	common->Warning( "Unknown vertex input type \"%s\". Ignoring.", pSemantic.c_str() );
	return IT_Invalid;
}

#endif // !! ASSIMP_BUILD_NO_DAE_IMPORTER