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source: osgVisual/trunk/src/distortion/visual_distortion.cpp @ 230

Last change on this file since 230 was 221, checked in by Torben Dannhauer, 14 years ago
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[221]	1	/* --c++-- osgVisual - Copyright (C) 2009-2011 Torben Dannhauer
[31]	2	*
	3	* This library is based on OpenSceneGraph, open source and may be redistributed and/or modified under
	4	* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
	5	* (at your option) any later version. The full license is in LICENSE file
	6	* included with this distribution, and on the openscenegraph.org website.
	7	*
	8	* osgVisual requires for some proprietary modules a license from the correspondig manufacturer.
	9	* You have to aquire licenses for all used proprietary modules.
	10	*
	11	* This library is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* OpenSceneGraph Public License for more details.
	15	*/
	16
	17	#include <visual_distortion.h>
	18
	19	using namespace osgVisual;
	20
[145]	21	visual_distortion::visual_distortion(osgViewer::Viewer* viewer_, osg::ArgumentParser& arguments_, std::string configFileName) : viewer(viewer_), arguments(arguments_)
[31]	22	{
	23	OSG_NOTIFY (osg::ALWAYS ) << "visual_distortion instantiated." << std::endl;
	24
[148]	25	this->configFileName = configFileName;
[31]	26	initialized = false;
	27	distortionEnabled = false;
	28	parser = new CameraConfigParser();
	29
	30	distortedGraph = NULL;
	31	cleanGraph = NULL;
	32
	33	distortMapTexture = NULL;
	34	blendMapTexture = NULL;
	35	}
	36
	37	visual_distortion::~visual_distortion(void)
	38	{
	39	OSG_NOTIFY (osg::ALWAYS ) << "visual_distortion destroyed." << std::endl;
	40	}
	41
[148]	42	bool visual_distortion::processXMLConfiguration()
	43	{
	44	// Init XML
	45	xmlDoc* tmpDoc;
[152]	46	bool disabled;
	47	xmlNode* config = util::getModuleXMLConfig( configFileName, "distortion", tmpDoc, disabled );
	48
	49	if( disabled)
	50	{
	51	OSG_NOTIFY( osg::ALWAYS ) << "..disabled by XML configuration file." << std::endl;
	52	return false;
	53	}
[149]	54
	55	// extract configuration values
[148]	56	if(config)
	57	{
[152]	58	OSG_NOTIFY( osg::ALWAYS ) << "..using distortion." << std::endl;
[151]	59
[149]	60	xmlNode* a_node = config->children;
[148]	61
[149]	62	for (xmlNode *cur_node = a_node; cur_node; cur_node = cur_node->next)
	63	{
	64	std::string node_name=reinterpret_cast<const char*>(cur_node->name);
[151]	65	//OSG_ALWAYS << "----visual_distortion::processXMLConfiguration() - node type="<< cur_node->type <<", name=" << cur_node->name << std::endl;
[148]	66
[149]	67	// Check for distortion node
	68	if(cur_node->type == XML_ELEMENT_NODE && node_name == "distortion")
	69	{
	70	xmlAttr *attr = cur_node->properties;
	71	while ( attr )
	72	{
	73	std::string attr_name=reinterpret_cast<const char*>(attr->name);
	74	std::string attr_value=reinterpret_cast<const char*>(attr->children->content);
	75	if( attr_name == "channelname" )
[150]	76	{
	77	std::string channelname = attr_value;
[151]	78	OSG_NOTIFY(osg::ALWAYS) << "visual_distortion: Channelname:" << channelname << std::endl;
[150]	79
	80	std::string pre_cfg("..\\resources\\distortion\\view_");
	81	std::string pre_distortion("..\\resources\\distortion\\distort_");
	82	std::string pre_blend("..\\resources\\distortion\\blend_");
	83	std::string post_cfg(".cfg");
	84	std::string post_distortion(".bmp");
	85	std::string post_blend(".bmp");
	86
	87	// load channel config
	88	parser->parseConfigFile((pre_cfg+channelname+post_cfg).data());
	89	// load channel blendmap
	90	blendMapFileName = (pre_blend+channelname+post_blend).data();
	91	// load channel distortionmap
	92	distortMapFileName = (pre_distortion+channelname+post_distortion).data();
	93	// set channel frustum
	94	if( parser->isConfigParsed())
	95	viewer->getCamera()->setProjectionMatrixAsFrustum((parser->getFrustumDataset())[0], (parser->getFrustumDataset())[1], (parser->getFrustumDataset())[2], (parser->getFrustumDataset())[3], (parser->getFrustumDataset())[4], (parser->getFrustumDataset())[5]);
	96	else
	97	OSG_NOTIFY(osg::WARN) << "WARNING: Unable to parse Frustum values from '" << pre_cfg<<channelname<<post_cfg << "' -- continue without valid frustum values." << std::endl;
	98	}
[149]	99	if( attr_name == "renderimplemmentation" )
	100	{
	101	if(attr_value=="fbo")
	102	renderImplementation = osg::Camera::FRAME_BUFFER_OBJECT;
	103	if(attr_value=="pbuffer")
	104	renderImplementation = osg::Camera::PIXEL_BUFFER;
	105	if(attr_value=="pbuffer-rtt")
	106	renderImplementation = osg::Camera::PIXEL_BUFFER_RTT;
	107	if(attr_value=="fb")
	108	renderImplementation = osg::Camera::FRAME_BUFFER;
	109	if(attr_value=="window")
	110	renderImplementation = osg::Camera::SEPERATE_WINDOW;
	111	}
	112	if( attr_name == "width" )
	113	{
	114	std::stringstream sstr(attr_value);
	115	sstr >> tex_width;
	116	}
	117	if( attr_name == "height" )
	118	{
	119	std::stringstream sstr(attr_value);
	120	sstr >> tex_height;
	121	}
	122	if( attr_name == "useshader" )
	123	useShaderDistortion = (attr_value == "yes") ? true : false;
	124	if( attr_name == "hdr" )
	125	useHDR = (attr_value == "yes") ? true : false;
	126	if( attr_name == "usetexturerectangle" )
	127	useTextureRectangle = (attr_value == "yes") ? true : false;
[148]	128
	129
[149]	130	attr = attr->next;
	131	} // WHILE attrib END
	132	} // IF Node == distortion END
	133
	134	// Check for distortionmap node
	135	if(cur_node->type == XML_ELEMENT_NODE && node_name == "distortionmap")
	136	{
[150]	137	xmlAttr *attr = cur_node->properties;
	138	while ( attr )
	139	{
	140	std::string attr_name=reinterpret_cast<const char*>(attr->name);
	141	std::string attr_value=reinterpret_cast<const char*>(attr->children->content);
	142	if( attr_name == "filename" )
	143	{
	144	distortMapFileName = attr_value;
	145	}
	146	attr = attr->next;
	147	}
[149]	148	}
	149
	150	// Check for distortionmap node
	151	if(cur_node->type == XML_ELEMENT_NODE && node_name == "blendmap")
	152	{
[150]	153	xmlAttr *attr = cur_node->properties;
	154	while ( attr )
	155	{
	156	std::string attr_name=reinterpret_cast<const char*>(attr->name);
	157	std::string attr_value=reinterpret_cast<const char*>(attr->children->content);
	158	if( attr_name == "filename" )
	159	{
	160	blendMapFileName = attr_value;
	161	}
	162	attr = attr->next;
	163	}
[149]	164	}
	165	} // FOR all nodes END
	166
[151]	167	// clean up
	168	xmlFreeDoc(tmpDoc); xmlCleanupParser();
	169	return true;
[149]	170	} // IF Config valid END
	171	else
[151]	172	{
[152]	173	OSG_WARN << "ERROR: visual_distortion::processXMLConfiguration() - Module configuration not found" << std::endl;
[151]	174	return false;
	175	}
[149]	176
[148]	177	return true;
	178	}
	179
[31]	180	osg::Group* visual_distortion::initialize(osg::Group* subgraph, const osg::Vec4& clearColor )
	181	{
[152]	182	OSG_NOTIFY (osg::ALWAYS ) << "visual_distortion initialize.."; // The sentence is finished by the init result...
[31]	183
[147]	184	// Initialize variables:
	185	tex_width = 2048;
	186	tex_height = 2048;
	187	renderImplementation = osg::Camera::FRAME_BUFFER_OBJECT;
	188	useTextureRectangle = false;
	189	useShaderDistortion = false;
	190	useHDR = false;
	191	distortMapFileName = "..\\resources\\distortion\\distort_distDisabled.bmp";
	192	blendMapFileName = "..\\resources\\distortion\\blend_distDisabled.bmp";
	193
[149]	194	// Process XML configuration
[151]	195	if(!processXMLConfiguration())
	196	return NULL; // Abort distortion initialization.
[147]	197
[31]	198	// Add this node to the scenegraph to get updated during update traversal.
	199	subgraph->addChild( this );
	200
	201	// add the keyboard handler for toggle distortion
[147]	202	arguments.getApplicationUsage()->addKeyboardMouseBinding("d", "Toggle Distortion.");
[31]	203	kBEventHandler = new ToggleDistortionKBEventHandler( this );
	204	viewer->addEventHandler( kBEventHandler );
	205
	206	cleanGraph = subgraph;
	207	distortedGraph = createPreRenderSubGraph( subgraph, clearColor );
	208
	209	// Create and install updateCallback (to get called for copying the main cameras view matrixes to the PRE_RENDER camera)
	210	// -- must be called _AFTER_ createPreRenderSubGraph() (necessary because sceneCamera is set by createPreRenderSubGraph())
	211	updateCallback = new distortionUpdateCallback( viewer, sceneCamera );
	212	this->setUpdateCallback( updateCallback );
	213
	214	// Note down state flags..
	215	initialized = true;
	216	distortionEnabled = true;
	217
	218	distortionEnabled = true;
	219	viewer->setSceneData( distortedGraph );
	220
	221	return distortedGraph;
	222	}
	223
	224	void visual_distortion::shutdown()
	225	{
	226	if(initialized)
	227	{
	228	// Remove this Node from scenegraph
	229	cleanGraph->removeChild( this );
	230
	231	// Remove update callback
	232	this->removeUpdateCallback( updateCallback );
	233	updateCallback = NULL;
	234
	235	OSG_NOTIFY (osg::ALWAYS ) << "visual_distortion shutdown complete." << std::endl;
	236	}
	237	}
	238
	239	void visual_distortion::distortionUpdateCallback::operator()(osg::Node* node, osg::NodeVisitor* nv)
	240	{
	241	// Copy Main Camera's matrixes to the PRE_RENDER Camera.
[145]	242	//std::cout << "distortion updatecallback" << std::endl;
[31]	243	sceneCamera->setViewMatrix( viewer->getCamera()->getViewMatrix() );
	244	sceneCamera->setProjectionMatrix( viewer->getCamera()->getProjectionMatrix() );
	245	}
	246
	247	void visual_distortion::toggleDistortion()
	248	{
	249	// Toggle
	250	//// If not Distorted: enabled distortion
	251	if( !distortionEnabled )
	252	{
	253	distortionEnabled = true;
	254	viewer->setSceneData( distortedGraph );
	255	}
	256	else // .. otherwise disable distortion
	257	{
	258	distortionEnabled = false;
	259	viewer->setSceneData( cleanGraph );
	260	}
	261	}
	262
	263
	264	osg::Group* visual_distortion::createPreRenderSubGraph(osg::Group* subgraph, const osg::Vec4& clearColor )
	265	{
	266	if (!subgraph) return 0;
	267
	268	// create a group to contain the flag and the pre rendering camera.
	269	osg::Group* parent = new osg::Group;
	270
	271	// texture to render to and to use for rendering of flag.
	272	osg::Texture* texture = 0;
	273	if (useTextureRectangle)
	274	{
	275	osg::TextureRectangle* textureRect = new osg::TextureRectangle;
	276	textureRect->setTextureSize(tex_width, tex_height);
	277	textureRect->setInternalFormat(GL_RGBA);
	278	textureRect->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
	279	textureRect->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
	280
	281	texture = textureRect;
	282	}
	283	else
	284	{
	285	osg::Texture2D* texture2D = new osg::Texture2D;
	286	texture2D->setTextureSize(tex_width, tex_height);
	287	texture2D->setInternalFormat(GL_RGBA);
	288	texture2D->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
	289	texture2D->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
	290
	291	texture = texture2D;
	292	}
	293
	294	if (useHDR)
	295	{
	296	texture->setInternalFormat(GL_RGBA16F_ARB);
	297	texture->setSourceFormat(GL_RGBA);
	298	texture->setSourceType(GL_FLOAT);
	299	}
	300
	301	// load a distortion map texture file
	302	if ( osgDB::fileExists( distortMapFileName ) )
	303	distortMapTexture = loadTexture(distortMapFileName);
	304	else
	305	{
	306	OSG_NOTIFY(osg::FATAL) << "ERROR: Distortionmap file'" << distortMapFileName << "' not found! Please change the channelname, filename or copy the desired file to the applications root folder!" << std::endl;
	307	exit(-1);
	308	}
	309
	310	// load a blend map texture file
	311	if ( osgDB::fileExists( blendMapFileName ) )
	312	blendMapTexture = loadTexture(blendMapFileName);
	313	else
	314	{
	315	OSG_NOTIFY(osg::FATAL) << "ERROR: Blendmap file'" << blendMapFileName << "' not found! Please change the channelname, filename or copy the desired file to the applications root folder!" << std::endl;
	316	exit(-1);
	317	}
	318
	319	// set up the plane to render the rendered view.
	320	{
	321	// create the quad to visualize.
	322	osg::Geometry* polyGeom = new osg::Geometry();
	323
	324	polyGeom->setSupportsDisplayList(false);
	325
	326	osg::Vec3 origin(0.0f,0.0f,0.0f);
	327	osg::Vec3 xAxis(1.0f,0.0f,0.0f);
	328	osg::Vec3 yAxis(0.0f,1.0f,0.0f);
	329	osg::Vec3 zAxis(0.0f,0.0f,1.0f);
	330	float height = 1024.0f;
	331	float width = 1280.0f;
	332	int noSteps = 128;
	333	if (useShaderDistortion)
	334	noSteps = 2;
	335
	336	osg::Vec3Array* vertices = new osg::Vec3Array;
	337	osg::Vec2Array* texcoords = new osg::Vec2Array;
	338	osg::Vec2Array* texcoords2 = useShaderDistortion?NULL:(new osg::Vec2Array);
	339	osg::Vec4Array* colors = new osg::Vec4Array;
	340
	341	osg::Vec3 bottom = origin;
	342	osg::Vec3 dx = xAxis*(width/((float)(noSteps-1)));
	343	osg::Vec3 dy = yAxis*(height/((float)(noSteps-1)));
	344
	345	osg::Vec2 bottom_texcoord(0.0f,0.0f);
	346	osg::Vec2 dx_texcoord(1.0f/(float)(noSteps-1),0.0f);
	347	osg::Vec2 dy_texcoord(0.0f,1.0f/(float)(noSteps-1));
	348
	349	osg::Vec3 cursor = bottom;
	350	osg::Vec2 texcoord = bottom_texcoord;
	351	int i,j;
	352	for(i=0;i<noSteps;++i)
	353	{
	354	osg::Vec3 cursor = bottom+dy*(float)i;
	355	osg::Vec2 texcoord = bottom_texcoord+dy_texcoord*(float)i;
	356	for(j=0;j<noSteps;++j)
	357	{
	358	vertices->push_back(cursor);
	359	if (distortMapTexture && !useShaderDistortion)
	360	{
	361	osg::Vec2 imgcoord = osg::Vec2((distortMapTexture->getImage(0)->s()-1) * texcoord.x(),
	362	(distortMapTexture->getImage(0)->t()-1) * texcoord.y());
	363	unsigned char* pPixel = &distortMapTexture->getImage(0)->data()[(int)imgcoord.y()*distortMapTexture->getImage(0)->getRowSizeInBytes()+
	364	(int)imgcoord.x()*distortMapTexture->getImage(0)->getPixelSizeInBits()/8];
	365	texcoords->push_back(osg::Vec2(((float)pPixel[2] / 255.0f + (pPixel[0] % 16)) / 16.0f,
	366	1.0f - ((float)pPixel[1] / 255.0f + (pPixel[0] / 16)) / 16.0f));
	367	texcoords2->push_back(osg::Vec2(texcoord.x(), texcoord.y()));
	368	}
	369	else
	370	texcoords->push_back(osg::Vec2(texcoord.x(), texcoord.y()));
	371	colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
	372
	373	cursor += dx;
	374	texcoord += dx_texcoord;
	375	}
	376	}
	377
	378	// pass the created vertex array to the points geometry object.
	379	polyGeom->setVertexArray(vertices);
	380
	381	polyGeom->setColorArray(colors);
	382	polyGeom->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
	383	polyGeom->setTexCoordArray(0,texcoords);
	384	if (!useShaderDistortion)
	385	polyGeom->setTexCoordArray(2,texcoords2);
	386
	387	for(i=0;i<noSteps-1;++i)
	388	{
	389	osg::DrawElementsUShort* elements = new osg::DrawElementsUShort(osg::PrimitiveSet::QUAD_STRIP);
	390	for(j=0;j<noSteps;++j)
	391	{
	392	elements->push_back(j+(i+1)*noSteps);
	393	elements->push_back(j+(i)*noSteps);
	394	}
	395	polyGeom->addPrimitiveSet(elements);
	396	}
	397
	398	// new we need to add the texture to the Drawable, we do so by creating a
	399	// StateSet to contain the Texture StateAttribute.
	400	osg::StateSet* stateset = polyGeom->getOrCreateStateSet();
	401	stateset->setTextureAttributeAndModes(0, texture, osg::StateAttribute::ON);
	402	stateset->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
	403	stateset->setMode(GL_DEPTH_TEST, osg::StateAttribute::OFF);
	404
	405	osg::Geode* geode = new osg::Geode();
	406	geode->addDrawable(polyGeom);
	407
	408	if (useShaderDistortion)
	409	{
	410	// apply the distortion map texture
	411	if (distortMapTexture)
	412	geode->getOrCreateStateSet()->setTextureAttributeAndModes(1, distortMapTexture, osg::StateAttribute::ON);
	413	}
	414
	415	// apply the blend map texture
	416	if (blendMapTexture)
	417	geode->getOrCreateStateSet()->setTextureAttributeAndModes(2, blendMapTexture, osg::StateAttribute::ON);
	418
	419	// set up the camera to render the textured quad
	420	osg::Camera* camera = new osg::Camera;
	421
	422	// just inherit the main cameras view
	423	camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
	424	camera->setViewMatrix(osg::Matrix::identity());
[145]	425	//sceneCamera->setProjectionMatrixAsOrtho2D(0,viewer->getCamera()->getViewport()->width(),0,viewer->getCamera()->getViewport()->height());
[31]	426	camera->setProjectionMatrixAsOrtho2D(0,1280,0,1024);
[145]	427	/** \todo: use screen size dynamically */
[31]	428
	429	// set the camera to render before the main camera.
	430	camera->setRenderOrder(osg::Camera::POST_RENDER, 200);
	431
	432	// only clear the depth buffer
	433	camera->setClearMask(0);
	434
	435	// add subgraph to render
	436	camera->addChild(geode);
	437
	438	if (useShaderDistortion)
	439	{
	440	// create shaders for distortion
	441	osg::StateSet* ss = geode->getOrCreateStateSet();
	442
	443	osg::Program* distortProgram = new osg::Program;
	444	distortProgram->setName( "distortion" );
	445	osg::Shader* distortVertObj = new osg::Shader( osg::Shader::VERTEX );
	446	osg::Shader* distortFragObj = new osg::Shader( osg::Shader::FRAGMENT );
	447
[147]	448	if (loadShaderSource( distortVertObj, "../resources/distortion/shader.vert" ) &&
	449	loadShaderSource( distortFragObj, "../resources/distortion/shader.frag" ) &&
[31]	450	distortMapTexture)
	451	{
	452	distortProgram->addShader( distortFragObj );
	453	distortProgram->addShader( distortVertObj );
	454	ss->addUniform( new osg::Uniform("textureImage", 0) );
	455	ss->addUniform( new osg::Uniform("textureDistort", 1) );
	456	ss->addUniform( new osg::Uniform("textureBlend", 2) );
	457	ss->setAttributeAndModes(distortProgram, osg::StateAttribute::ON);
	458	}
	459	else
	460	{
	461	OSG_NOTIFY(osg::FATAL) << "##################################" << std::endl << "## Unable to activate ShaderDistortion!" << std::endl << "## ABORT" << std::endl << "##################################" << std::endl;
	462	exit(0);
	463	}
	464	}
	465
	466	parent->addChild(camera);
	467	}
	468
	469	// then create the camera node to do the render to texture
	470	{
	471	osg::Camera* camera = new osg::Camera;
	472
	473	// set up the background color and clear mask.
	474	camera->setClearColor(clearColor);
	475	camera->setClearMask(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
	476
	477
	478	// just inherit the main cameras view
	479	/* ABSOLUTE_RF required to make intersections possible.
	480	Disadvantage of ABOLUTE_RF : the maincameras view matrix and projection
	481	matrix has to copied to the PRE_RENDER camera by our self.
	482	Therefore an update callback is installed.
	483	*/
	484	camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
	485	camera->setProjectionMatrix(osg::Matrixd::identity());
	486	camera->setViewMatrix(osg::Matrixd::identity());
	487
	488	// set viewport
	489	camera->setViewport(0,0,tex_width,tex_height);
	490
	491	// set the camera to render before the main camera.
	492	camera->setRenderOrder(osg::Camera::PRE_RENDER, 0);
	493
	494	sceneCamera = camera;
	495
	496	// tell the camera to use OpenGL frame buffer object where supported.
	497	camera->setRenderTargetImplementation(renderImplementation);
	498
	499	// attach the texture and use it as the color buffer.
	500	camera->attach(osg::Camera::COLOR_BUFFER, texture); // No Multisampling/Antialiasing
	501	//camera->attach(osg::Camera::COLOR_BUFFER, texture, 0, 0, false, 4, 4); // 4x Multisampling/Antialiasing
	502
	503	// add subgraph to render
	504	camera->addChild(subgraph);
	505
	506	parent->addChild(camera);
	507	}
	508	return parent;
	509	}
	510
	511
	512	bool visual_distortion::loadShaderSource( osg::Shader* shader, const std::string& fileName )
	513	{
	514	std::string foundFileName = osgDB::findDataFile(fileName);
	515	if (foundFileName.length() != 0 )
	516	{
	517	return shader->loadShaderSourceFromFile( foundFileName.c_str() );
	518	}
	519
	520	OSG_NOTIFY(osg::WARN) << "File \"" << fileName << "\" not found." << std::endl;
	521
	522	return false;
	523	}
	524
	525	osg::Texture* visual_distortion::loadTexture( const std::string& fileName )
	526	{
	527	std::string foundFileName = osgDB::findDataFile(fileName);
	528	if (foundFileName.length() != 0 )
	529	{
	530	// load distortion map texture file
	531	osg::Image* image = osgDB::readImageFile(foundFileName);
	532	if (image)
	533	{
	534	osg::Texture2D* texture = new osg::Texture2D;
	535	texture->setImage(image);
	536	texture->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::NEAREST);
	537	texture->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::NEAREST);
	538	texture->setWrap(osg::Texture2D::WRAP_S, osg::Texture2D::CLAMP_TO_EDGE);
	539	texture->setWrap(osg::Texture2D::WRAP_T, osg::Texture2D::CLAMP_TO_EDGE);
	540	return texture;
	541	}
	542	}
	543
	544	OSG_NOTIFY(osg::WARN) << "File \"" << fileName << "\" not found." << std::endl;
	545
	546	return NULL;
	547	}

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