binaries/assimp-3.1.1/code/XGLLoader.cpp

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

Copyright (c) 2006-2012, assimp team

All rights reserved.

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* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
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  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the assimp team.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*/

/** @file Implementation of the XGL/ZGL importer class */

#include "AssimpPCH.h"
#ifndef ASSIMP_BUILD_NO_XGL_IMPORTER

#include "XGLLoader.h"
#include "ParsingUtils.h"
#include "fast_atof.h"

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

using namespace Assimp;
using namespace irr;
using namespace irr::io;


// zlib is needed for compressed XGL files 
#ifndef ASSIMP_BUILD_NO_COMPRESSED_XGL
#	ifdef ASSIMP_BUILD_NO_OWN_ZLIB
#		include <zlib.h>
#	else
#		include "../contrib/zlib/zlib.h"
#	endif
#endif


// scopeguard for a malloc'ed buffer
struct free_it
{
	free_it(void* free) : free(free) {}
	~free_it() {
		::free(this->free);
	}

	void* free;
};

namespace Assimp { // this has to be in here because LogFunctions is in ::Assimp
template<> const std::string LogFunctions<XGLImporter>::log_prefix = "XGL: ";

}

static const aiImporterDesc desc = {
	"XGL Importer",
	"",
	"",
	"",
	aiImporterFlags_SupportTextFlavour,
	0,
	0,
	0,
	0,
	"xgl zgl" 
};


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

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

// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file. 
bool XGLImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler, bool checkSig) const
{
	/* NOTE: A simple check for the file extension is not enough
	 * here. XGL and ZGL are ok, but xml is too generic
	 * and might be collada as well. So open the file and
	 * look for typical signal tokens.
	 */
	const std::string extension = GetExtension(pFile);

	if (extension == "xgl" || extension == "zgl") {
		return true;
	}
	else if (extension == "xml" || checkSig) {
		ai_assert(pIOHandler != NULL);

		const char* tokens[] = {"<world>","<World>","<WORLD>"};
		return SearchFileHeaderForToken(pIOHandler,pFile,tokens,3);
	}
	return false;
}

// ------------------------------------------------------------------------------------------------
// Get a list of all file extensions which are handled by this class
const aiImporterDesc* XGLImporter::GetInfo () const
{
	return &desc;
}

// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure. 
void XGLImporter::InternReadFile( const std::string& pFile, 
	aiScene* pScene, IOSystem* pIOHandler)
{
#ifndef ASSIMP_BUILD_NO_COMPRESSED_XGL
	Bytef* dest = NULL;
	free_it free_it_really(dest);
#endif

	scene = pScene;
	boost::shared_ptr<IOStream> stream( pIOHandler->Open( pFile, "rb"));

	// check whether we can read from the file
	if( stream.get() == NULL) {
		throw DeadlyImportError( "Failed to open XGL/ZGL file " + pFile + "");
	}

	// see if its compressed, if so uncompress it
	if (GetExtension(pFile) == "zgl") {
#ifdef ASSIMP_BUILD_NO_COMPRESSED_XGL
		ThrowException("Cannot read ZGL file since Assimp was built without compression support");
#else
		boost::scoped_ptr<StreamReaderLE> raw_reader(new StreamReaderLE(stream));	

		// build a zlib stream
		z_stream zstream;
		zstream.opaque = Z_NULL;
		zstream.zalloc = Z_NULL;
		zstream.zfree  = Z_NULL;
		zstream.data_type = Z_BINARY;

		// raw decompression without a zlib or gzip header
		inflateInit2(&zstream, -MAX_WBITS);

		// skip two extra bytes, zgl files do carry a crc16 upfront (I think)
		raw_reader->IncPtr(2);

		zstream.next_in   = reinterpret_cast<Bytef*>( raw_reader->GetPtr() );
		zstream.avail_in  = raw_reader->GetRemainingSize();
		
		size_t total = 0l;

		// and decompress the data .... do 1k chunks in the hope that we won't kill the stack
	#define MYBLOCK 1024
		Bytef block[MYBLOCK];
		int ret;
		do {
			zstream.avail_out = MYBLOCK;
			zstream.next_out = block;
			ret = inflate(&zstream, Z_NO_FLUSH);

			if (ret != Z_STREAM_END && ret != Z_OK) {
				ThrowException("Failure decompressing this file using gzip, seemingly it is NOT a compressed .XGL file");
			}
			const size_t have = MYBLOCK - zstream.avail_out;
			total += have;
			dest = reinterpret_cast<Bytef*>( realloc(dest,total) );
			memcpy(dest + total - have,block,have);
		} 
		while (ret != Z_STREAM_END);

		// terminate zlib
		inflateEnd(&zstream);

		// replace the input stream with a memory stream
		stream.reset(new MemoryIOStream(reinterpret_cast<uint8_t*>(dest),total)); 
#endif
	}

	// construct the irrXML parser
	CIrrXML_IOStreamReader st(stream.get());
	boost::scoped_ptr<IrrXMLReader> read( createIrrXMLReader((IFileReadCallBack*) &st) );
	reader = read.get();

	// parse the XML file
	TempScope scope;

	while (ReadElement())	{	
		if (!ASSIMP_stricmp(reader->getNodeName(),"world")) {
			ReadWorld(scope);
		}
	}
	

	std::vector<aiMesh*>& meshes = scope.meshes_linear;
	std::vector<aiMaterial*>& materials = scope.materials_linear;
	if(!meshes.size() || !materials.size()) {
		ThrowException("failed to extract data from XGL file, no meshes loaded");
	}

	// copy meshes
	scene->mNumMeshes = static_cast<unsigned int>(meshes.size());
	scene->mMeshes = new aiMesh*[scene->mNumMeshes]();
	std::copy(meshes.begin(),meshes.end(),scene->mMeshes);

	// copy materials
	scene->mNumMaterials = static_cast<unsigned int>(materials.size());
	scene->mMaterials = new aiMaterial*[scene->mNumMaterials]();
	std::copy(materials.begin(),materials.end(),scene->mMaterials);

	if (scope.light) {
		scene->mNumLights = 1;
		scene->mLights = new aiLight*[1];
		scene->mLights[0] = scope.light;

		scope.light->mName = scene->mRootNode->mName;
	}

	scope.dismiss();
}

// ------------------------------------------------------------------------------------------------
bool XGLImporter::ReadElement()
{
	while(reader->read()) {
		if (reader->getNodeType() == EXN_ELEMENT) {
			return true;
		}
	}
	return false;
}

// ------------------------------------------------------------------------------------------------
bool XGLImporter::ReadElementUpToClosing(const char* closetag)
{
	while(reader->read()) {
		if (reader->getNodeType() == EXN_ELEMENT) {
			return true;
		}
		else if (reader->getNodeType() == EXN_ELEMENT_END && !ASSIMP_stricmp(reader->getNodeName(),closetag)) {
			return false;
		}
	}
	LogError("unexpected EOF, expected closing <" + std::string(closetag) + "> tag");
	return false;
}

// ------------------------------------------------------------------------------------------------
bool XGLImporter::SkipToText()
{
	while(reader->read()) {
		if (reader->getNodeType() == EXN_TEXT) {
			return true;
		}
		else if (reader->getNodeType() == EXN_ELEMENT || reader->getNodeType() == EXN_ELEMENT_END) {
			ThrowException("expected text contents but found another element (or element end)");
		}
	}
	return false;
}

// ------------------------------------------------------------------------------------------------
std::string XGLImporter::GetElementName()
{
	const char* s  = reader->getNodeName();
	size_t len = strlen(s);

	std::string ret;
	ret.resize(len);

	std::transform(s,s+len,ret.begin(),::tolower);
	return ret;
}

// ------------------------------------------------------------------------------------------------
void XGLImporter::ReadWorld(TempScope& scope)
{
	while (ReadElementUpToClosing("world"))	{	
		const std::string& s = GetElementName();
		// XXX right now we'd skip <lighting> if it comes after
		// <object> or <mesh>
		if (s == "lighting") {
			ReadLighting(scope);
		}
		else if (s == "object" || s == "mesh" || s == "mat") {
			break;
		}
	}

	
	aiNode* const nd = ReadObject(scope,true,"world");
	if(!nd) {
		ThrowException("failure reading <world>");
	}
	if(!nd->mName.length) {
		nd->mName.Set("WORLD");
	}

	scene->mRootNode = nd;
}

// ------------------------------------------------------------------------------------------------
void XGLImporter::ReadLighting(TempScope& scope)
{
	while (ReadElementUpToClosing("lighting"))	{
		const std::string& s = GetElementName();
		if (s == "directionallight") {
			scope.light = ReadDirectionalLight();
		}
		else if (s == "ambient") {
			LogWarn("ignoring <ambient> tag");
		}
		else if (s == "spheremap") {
			LogWarn("ignoring <spheremap> tag");
		}
	}
}

// ------------------------------------------------------------------------------------------------
aiLight* XGLImporter::ReadDirectionalLight()
{
	ScopeGuard<aiLight> l(new aiLight());
	l->mType = aiLightSource_DIRECTIONAL;

	while (ReadElementUpToClosing("directionallight"))	{	
		const std::string& s = GetElementName();
		if (s == "direction") {
			l->mDirection = ReadVec3();
		}
		else if (s == "diffuse") {
			l->mColorDiffuse = ReadCol3();
		}
		else if (s == "specular") {
			l->mColorSpecular = ReadCol3();
		}
	}
	return l.dismiss();
}

// ------------------------------------------------------------------------------------------------
aiNode* XGLImporter::ReadObject(TempScope& scope, bool skipFirst, const char* closetag)
{
	ScopeGuard<aiNode> nd(new aiNode());
	std::vector<aiNode*> children;
	std::vector<unsigned int> meshes;

	try {
		while (skipFirst || ReadElementUpToClosing(closetag))	{
			skipFirst = false;

			const std::string& s = GetElementName();
			if (s == "mesh") {
				const size_t prev = scope.meshes_linear.size();
				if(ReadMesh(scope)) {
					const size_t newc = scope.meshes_linear.size();
					for(size_t i = 0; i < newc-prev; ++i) {
						meshes.push_back(static_cast<unsigned int>(i+prev));
					}
				}
			}
			else if (s == "mat") {
				ReadMaterial(scope);
			}
			else if (s == "object") {
				children.push_back(ReadObject(scope));
			}
			else if (s == "objectref") {
				// XXX
			}
			else if (s == "meshref") {
				const unsigned int id = static_cast<unsigned int>( ReadIndexFromText() );

				std::multimap<unsigned int, aiMesh*>::iterator it = scope.meshes.find(id), end = scope.meshes.end();
				if (it == end) {
					ThrowException("<meshref> index out of range");
				}

				for(; it != end && (*it).first == id; ++it) {
					// ok, this is n^2 and should get optimized one day
					aiMesh* const m = (*it).second;

					unsigned int i = 0, mcount = static_cast<unsigned int>(scope.meshes_linear.size());
					for(; i < mcount; ++i) {
						if (scope.meshes_linear[i] == m) {
							meshes.push_back(i);
							break;
						}
					}

					ai_assert(i < mcount);
				}
			}
			else if (s == "transform") {
				nd->mTransformation = ReadTrafo();
			}
		}

	} catch(...) {
		BOOST_FOREACH(aiNode* ch, children) {
			delete ch;
		}
		throw;
	}

	// link meshes to node
	nd->mNumMeshes = static_cast<unsigned int>(meshes.size());
	if (nd->mNumMeshes) {
		nd->mMeshes = new unsigned int[nd->mNumMeshes]();
		for(unsigned int i = 0; i < nd->mNumMeshes; ++i) {
			nd->mMeshes[i] = meshes[i];
		}
	}

	// link children to parent
	nd->mNumChildren = static_cast<unsigned int>(children.size());
	if (nd->mNumChildren) {
		nd->mChildren = new aiNode*[nd->mNumChildren]();
		for(unsigned int i = 0; i < nd->mNumChildren; ++i) {
			nd->mChildren[i] = children[i];
			children[i]->mParent = nd;
		}
	}

	return nd.dismiss();
}

// ------------------------------------------------------------------------------------------------
aiMatrix4x4 XGLImporter::ReadTrafo()
{
	aiVector3D forward, up, right, position;
	float scale = 1.0f;

	while (ReadElementUpToClosing("transform"))	{	
		const std::string& s = GetElementName();
		if (s == "forward") {
			forward = ReadVec3();
		}
		else if (s == "up") {
			up = ReadVec3();
		}
		else if (s == "position") {
			position = ReadVec3();
		}
		if (s == "scale") {
			scale = ReadFloat();
			if(scale < 0.f) {
				// this is wrong, but we can leave the value and pass it to the caller
				LogError("found negative scaling in <transform>, ignoring");
			}
		}
	}

	aiMatrix4x4 m;
	if(forward.SquareLength() < 1e-4 || up.SquareLength() < 1e-4) {
		LogError("A direction vector in <transform> is zero, ignoring trafo");
		return m;
	}

	forward.Normalize();
	up.Normalize();

	right = forward ^ up;
	if (fabs(up * forward) > 1e-4) {
		// this is definitely wrong - a degenerate coordinate space ruins everything
		// so subtitute identity transform.
		LogError("<forward> and <up> vectors in <transform> are skewing, ignoring trafo");
		return m;
	}

	right *= scale;
	up *= scale;
	forward *= scale;

	m.a1 = right.x;
	m.b1 = right.y;
	m.c1 = right.z;

	m.a2 = up.x;
	m.b2 = up.y;
	m.c2 = up.z;

	m.a3 = forward.x;
	m.b3 = forward.y;
	m.c3 = forward.z;

	m.a4 = position.x;
	m.b4 = position.y;
	m.c4 = position.z;

	return m;
}

// ------------------------------------------------------------------------------------------------
aiMesh* XGLImporter::ToOutputMesh(const TempMaterialMesh& m)
{
	ScopeGuard<aiMesh> mesh(new aiMesh());

	mesh->mNumVertices = static_cast<unsigned int>(m.positions.size());
	mesh->mVertices = new aiVector3D[mesh->mNumVertices];
	std::copy(m.positions.begin(),m.positions.end(),mesh->mVertices);

	if(m.normals.size()) {
		mesh->mNormals = new aiVector3D[mesh->mNumVertices];
		std::copy(m.normals.begin(),m.normals.end(),mesh->mNormals);
	}

	if(m.uvs.size()) {
		mesh->mNumUVComponents[0] = 2;
		mesh->mTextureCoords[0] = new aiVector3D[mesh->mNumVertices];

		for(unsigned int i = 0; i < mesh->mNumVertices; ++i) {
			mesh->mTextureCoords[0][i] = aiVector3D(m.uvs[i].x,m.uvs[i].y,0.f);
		}
	}

	mesh->mNumFaces =  static_cast<unsigned int>(m.vcounts.size());
	mesh->mFaces = new aiFace[m.vcounts.size()];

	unsigned int idx = 0;
	for(unsigned int i = 0; i < mesh->mNumFaces; ++i) {
		aiFace& f = mesh->mFaces[i];
		f.mNumIndices = m.vcounts[i];
		f.mIndices = new unsigned int[f.mNumIndices];
		for(unsigned int c = 0; c < f.mNumIndices; ++c) {
			f.mIndices[c] = idx++;
		}
	}

	ai_assert(idx == mesh->mNumVertices);

	mesh->mPrimitiveTypes = m.pflags;
	mesh->mMaterialIndex = m.matid;
	return mesh.dismiss();
}

// ------------------------------------------------------------------------------------------------
bool XGLImporter::ReadMesh(TempScope& scope)
{
	TempMesh t;

	std::map<unsigned int, TempMaterialMesh> bymat;
	const unsigned int mesh_id = ReadIDAttr();

	while (ReadElementUpToClosing("mesh"))	{	
		const std::string& s = GetElementName();

		if (s == "mat") {
			ReadMaterial(scope);
		}
		else if (s == "p") {
			if (!reader->getAttributeValue("ID")) {
				LogWarn("no ID attribute on <p>, ignoring");
			}
			else {
				int id = reader->getAttributeValueAsInt("ID");
				t.points[id] = ReadVec3();
			}
		}
		else if (s == "n") {
			if (!reader->getAttributeValue("ID")) {
				LogWarn("no ID attribute on <n>, ignoring");
			}
			else {
				int id = reader->getAttributeValueAsInt("ID");
				t.normals[id] = ReadVec3();
			}
		}
		else if (s == "tc") {
			if (!reader->getAttributeValue("ID")) {
				LogWarn("no ID attribute on <tc>, ignoring");
			}
			else {
				int id = reader->getAttributeValueAsInt("ID");
				t.uvs[id] = ReadVec2();
			}
		}
		else if (s == "f" || s == "l" || s == "p") {
			const unsigned int vcount = s == "f" ? 3 : (s == "l" ? 2 : 1);

			unsigned int mid = ~0u;
			TempFace tf[3];
			bool has[3] = {0};

			while (ReadElementUpToClosing(s.c_str()))	{
				const std::string& s = GetElementName();
				if (s == "fv1" || s == "lv1" || s == "pv1") {
					ReadFaceVertex(t,tf[0]);
					has[0] = true;
				}
				else if (s == "fv2" || s == "lv2") {
					ReadFaceVertex(t,tf[1]);
					has[1] = true;
				}
				else if (s == "fv3") {
					ReadFaceVertex(t,tf[2]);
					has[2] = true;
				}
				else if (s == "mat") {
					if (mid != ~0u) {
						LogWarn("only one material tag allowed per <f>");
					}
					mid = ResolveMaterialRef(scope);
				}
				else if (s == "matref") {
					if (mid != ~0u) {
						LogWarn("only one material tag allowed per <f>");
					}
					mid = ResolveMaterialRef(scope);
				}
			}

			if (mid == ~0u) {
				ThrowException("missing material index");
			}

			bool nor = false;
			bool uv = false;
			for(unsigned int i = 0; i < vcount; ++i) {
				if (!has[i]) {
					ThrowException("missing face vertex data");
				}

				nor = nor || tf[i].has_normal;
				uv = uv || tf[i].has_uv;
			}			

			if (mid >= (1<<30)) {
				LogWarn("material indices exhausted, this may cause errors in the output");
			}
			unsigned int meshId = mid | ((nor?1:0)<<31) | ((uv?1:0)<<30);

			TempMaterialMesh& mesh = bymat[meshId];
			mesh.matid = mid;

			for(unsigned int i = 0; i < vcount; ++i) {
				mesh.positions.push_back(tf[i].pos);
				if(nor) {
					mesh.normals.push_back(tf[i].normal);
				}
				if(uv) {
					mesh.uvs.push_back(tf[i].uv);
				}
				
				mesh.pflags |= 1 << (vcount-1);
			}

			mesh.vcounts.push_back(vcount);
		}		
	}

	// finally extract output meshes and add them to the scope 
	typedef std::pair<unsigned int, TempMaterialMesh> pairt;
	BOOST_FOREACH(const pairt& p, bymat) {
		aiMesh* const m  = ToOutputMesh(p.second);
		scope.meshes_linear.push_back(m);

		// if this is a definition, keep it on the stack
		if(mesh_id != ~0u) {
			scope.meshes.insert(std::pair<unsigned int, aiMesh*>(mesh_id,m));
		}
	}

	// no id == not a reference, insert this mesh right *here*
	return mesh_id == ~0u;
}

// ----------------------------------------------------------------------------------------------
unsigned int XGLImporter::ResolveMaterialRef(TempScope& scope)
{
	const std::string& s = GetElementName();
	if (s == "mat") {
		ReadMaterial(scope);
		return scope.materials_linear.size()-1;
	}

	const int id = ReadIndexFromText();

	std::map<unsigned int, aiMaterial*>::iterator it = scope.materials.find(id), end = scope.materials.end();
	if (it == end) {
		ThrowException("<matref> index out of range");
	}
	
	// ok, this is n^2 and should get optimized one day
	aiMaterial* const m = (*it).second;

	unsigned int i = 0, mcount = static_cast<unsigned int>(scope.materials_linear.size());
	for(; i < mcount; ++i) {
		if (scope.materials_linear[i] == m) {
			return i;
		}
	}

	ai_assert(false);
	return 0;
}

// ------------------------------------------------------------------------------------------------
void XGLImporter::ReadMaterial(TempScope& scope)
{
	const unsigned int mat_id = ReadIDAttr();

	ScopeGuard<aiMaterial> mat(new aiMaterial());
	while (ReadElementUpToClosing("mat"))  {
		const std::string& s = GetElementName();
		if (s == "amb") {
			const aiColor3D c = ReadCol3();
			mat->AddProperty(&c,1,AI_MATKEY_COLOR_AMBIENT);
		}
		else if (s == "diff") {
			const aiColor3D c = ReadCol3();
			mat->AddProperty(&c,1,AI_MATKEY_COLOR_DIFFUSE);
		}
		else if (s == "spec") {
			const aiColor3D c = ReadCol3();
			mat->AddProperty(&c,1,AI_MATKEY_COLOR_SPECULAR);
		}
		else if (s == "emiss") {
			const aiColor3D c = ReadCol3();
			mat->AddProperty(&c,1,AI_MATKEY_COLOR_EMISSIVE);
		}
		else if (s == "alpha") {
			const float f = ReadFloat();
			mat->AddProperty(&f,1,AI_MATKEY_OPACITY);
		}
		else if (s == "shine") {
			const float f = ReadFloat();
			mat->AddProperty(&f,1,AI_MATKEY_SHININESS);
		}
	}

	scope.materials[mat_id] = mat;
	scope.materials_linear.push_back(mat.dismiss());
}


// ----------------------------------------------------------------------------------------------
void XGLImporter::ReadFaceVertex(const TempMesh& t, TempFace& out)
{
	const std::string& end = GetElementName();

	bool havep = false;
	while (ReadElementUpToClosing(end.c_str()))  {
		const std::string& s = GetElementName();
		if (s == "pref") {
			const unsigned int id = ReadIndexFromText();
			std::map<unsigned int, aiVector3D>::const_iterator it = t.points.find(id);
			if (it == t.points.end()) {
				ThrowException("point index out of range");
			}

			out.pos = (*it).second;
			havep = true;
		}
		else if (s == "nref") {
			const unsigned int id = ReadIndexFromText();
			std::map<unsigned int, aiVector3D>::const_iterator it = t.normals.find(id);
			if (it == t.normals.end()) {
				ThrowException("normal index out of range");
			}

			out.normal = (*it).second;
			out.has_normal = true;
		}
		else if (s == "tcref") {
			const unsigned int id = ReadIndexFromText();
			std::map<unsigned int, aiVector2D>::const_iterator it = t.uvs.find(id);
			if (it == t.uvs.end()) {
				ThrowException("uv index out of range");
			}

			out.uv = (*it).second;
			out.has_uv = true;
		}
		else if (s == "p") {
			out.pos = ReadVec3();
		}
		else if (s == "n") {
			out.normal = ReadVec3();
		}
		else if (s == "tc") {
			out.uv = ReadVec2();
		}
	}

	if (!havep) {
		ThrowException("missing <pref> in <fvN> element");
	}
}

// ------------------------------------------------------------------------------------------------
unsigned int XGLImporter::ReadIDAttr()
{
	for(int i = 0, e = reader->getAttributeCount(); i < e; ++i) {
	
		if(!ASSIMP_stricmp(reader->getAttributeName(i),"id")) {
			return reader->getAttributeValueAsInt(i);
		}
	}	
	return ~0u;
}

// ------------------------------------------------------------------------------------------------
float XGLImporter::ReadFloat()
{
	if(!SkipToText()) {
		LogError("unexpected EOF reading float element contents");
		return 0.f;
	}
	const char* s = reader->getNodeData(), *se;

	if(!SkipSpaces(&s)) {
		LogError("unexpected EOL, failed to parse float");
		return 0.f;
	}

	float t;
	se = fast_atoreal_move(s,t);

	if (se == s) {
		LogError("failed to read float text");
		return 0.f;
	}

	return t;
}

// ------------------------------------------------------------------------------------------------
unsigned int XGLImporter::ReadIndexFromText()
{
	if(!SkipToText()) {
		LogError("unexpected EOF reading index element contents");
		return ~0u;
	}
	const char* s = reader->getNodeData(), *se;
	if(!SkipSpaces(&s)) {
		LogError("unexpected EOL, failed to parse index element");
		return ~0u;
	}

	const unsigned int t = strtoul10(s,&se);

	if (se == s) {
		LogError("failed to read index");
		return ~0u;
	}

	return t;
}

// ------------------------------------------------------------------------------------------------
aiVector2D XGLImporter::ReadVec2()
{
	aiVector2D vec;

	if(!SkipToText()) {
		LogError("unexpected EOF reading vec2 contents");
		return vec;
	}
	const char* s = reader->getNodeData();

	for(int i = 0; i < 2; ++i) {
		if(!SkipSpaces(&s)) {
			LogError("unexpected EOL, failed to parse vec2");
			return vec;
		}
		vec[i] = fast_atof(&s);

		SkipSpaces(&s);
		if (i != 1 && *s != ',') {
			LogError("expected comma, failed to parse vec2");
			return vec;
		}
		++s;
	}

	return vec;
}

// ------------------------------------------------------------------------------------------------
aiVector3D XGLImporter::ReadVec3()
{
	aiVector3D vec;

	if(!SkipToText()) {
		LogError("unexpected EOF reading vec3 contents");
		return vec;
	}
	const char* s = reader->getNodeData();

	for(int i = 0; i < 3; ++i) {
		if(!SkipSpaces(&s)) {
			LogError("unexpected EOL, failed to parse vec3");
			return vec;
		}
		vec[i] = fast_atof(&s);

		SkipSpaces(&s);
		if (i != 2 && *s != ',') {
			LogError("expected comma, failed to parse vec3");
			return vec;
		}
		++s;
	}

	return vec;
}

// ------------------------------------------------------------------------------------------------
aiColor3D XGLImporter::ReadCol3()
{
	const aiVector3D& v = ReadVec3();
	if (v.x < 0.f || v.x > 1.0f || v.y < 0.f || v.y > 1.0f || v.z < 0.f || v.z > 1.0f) {
		LogWarn("color values out of range, ignoring");
	}
	return aiColor3D(v.x,v.y,v.z);
}

#endif