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visual_distortion.cpp @ 361

Last change on this file since 361 was 305, checked in by Torben Dannhauer, 13 years ago

File size: 19.2 KB

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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	}
[305]	99	if( attr_name == "width" )
[149]	100	{
	101	std::stringstream sstr(attr_value);
	102	sstr >> tex_width;
	103	}
	104	if( attr_name == "height" )
	105	{
	106	std::stringstream sstr(attr_value);
	107	sstr >> tex_height;
	108	}
	109	if( attr_name == "useshader" )
	110	useShaderDistortion = (attr_value == "yes") ? true : false;
	111	if( attr_name == "hdr" )
	112	useHDR = (attr_value == "yes") ? true : false;
	113	if( attr_name == "usetexturerectangle" )
	114	useTextureRectangle = (attr_value == "yes") ? true : false;
[148]	115
	116
[149]	117	attr = attr->next;
	118	} // WHILE attrib END
	119	} // IF Node == distortion END
	120
	121	// Check for distortionmap node
	122	if(cur_node->type == XML_ELEMENT_NODE && node_name == "distortionmap")
	123	{
[150]	124	xmlAttr *attr = cur_node->properties;
	125	while ( attr )
	126	{
	127	std::string attr_name=reinterpret_cast<const char*>(attr->name);
	128	std::string attr_value=reinterpret_cast<const char*>(attr->children->content);
	129	if( attr_name == "filename" )
	130	{
	131	distortMapFileName = attr_value;
	132	}
	133	attr = attr->next;
	134	}
[149]	135	}
	136
	137	// Check for distortionmap node
	138	if(cur_node->type == XML_ELEMENT_NODE && node_name == "blendmap")
	139	{
[150]	140	xmlAttr *attr = cur_node->properties;
	141	while ( attr )
	142	{
	143	std::string attr_name=reinterpret_cast<const char*>(attr->name);
	144	std::string attr_value=reinterpret_cast<const char*>(attr->children->content);
	145	if( attr_name == "filename" )
	146	{
	147	blendMapFileName = attr_value;
	148	}
	149	attr = attr->next;
	150	}
[149]	151	}
	152	} // FOR all nodes END
	153
[151]	154	// clean up
	155	xmlFreeDoc(tmpDoc); xmlCleanupParser();
	156	return true;
[149]	157	} // IF Config valid END
	158	else
[151]	159	{
[152]	160	OSG_WARN << "ERROR: visual_distortion::processXMLConfiguration() - Module configuration not found" << std::endl;
[151]	161	return false;
	162	}
[149]	163
[148]	164	return true;
	165	}
	166
[31]	167	osg::Group* visual_distortion::initialize(osg::Group* subgraph, const osg::Vec4& clearColor )
	168	{
[152]	169	OSG_NOTIFY (osg::ALWAYS ) << "visual_distortion initialize.."; // The sentence is finished by the init result...
[31]	170
[147]	171	// Initialize variables:
	172	tex_width = 2048;
	173	tex_height = 2048;
	174	useShaderDistortion = false;
	175	useHDR = false;
	176	distortMapFileName = "..\\resources\\distortion\\distort_distDisabled.bmp";
	177	blendMapFileName = "..\\resources\\distortion\\blend_distDisabled.bmp";
	178
[149]	179	// Process XML configuration
[151]	180	if(!processXMLConfiguration())
	181	return NULL; // Abort distortion initialization.
[147]	182
[31]	183	// Add this node to the scenegraph to get updated during update traversal.
	184	subgraph->addChild( this );
	185
	186	// add the keyboard handler for toggle distortion
[147]	187	arguments.getApplicationUsage()->addKeyboardMouseBinding("d", "Toggle Distortion.");
[31]	188	kBEventHandler = new ToggleDistortionKBEventHandler( this );
	189	viewer->addEventHandler( kBEventHandler );
	190
	191	cleanGraph = subgraph;
	192	distortedGraph = createPreRenderSubGraph( subgraph, clearColor );
	193
	194	// Create and install updateCallback (to get called for copying the main cameras view matrixes to the PRE_RENDER camera)
	195	// -- must be called _AFTER_ createPreRenderSubGraph() (necessary because sceneCamera is set by createPreRenderSubGraph())
	196	updateCallback = new distortionUpdateCallback( viewer, sceneCamera );
	197	this->setUpdateCallback( updateCallback );
	198
	199	// Note down state flags..
	200	initialized = true;
	201	distortionEnabled = true;
	202
	203	distortionEnabled = true;
	204	viewer->setSceneData( distortedGraph );
	205
	206	return distortedGraph;
	207	}
	208
	209	void visual_distortion::shutdown()
	210	{
	211	if(initialized)
	212	{
	213	// Remove this Node from scenegraph
	214	cleanGraph->removeChild( this );
	215
	216	// Remove update callback
	217	this->removeUpdateCallback( updateCallback );
	218	updateCallback = NULL;
	219
	220	OSG_NOTIFY (osg::ALWAYS ) << "visual_distortion shutdown complete." << std::endl;
	221	}
	222	}
	223
	224	void visual_distortion::distortionUpdateCallback::operator()(osg::Node* node, osg::NodeVisitor* nv)
	225	{
	226	// Copy Main Camera's matrixes to the PRE_RENDER Camera.
[145]	227	//std::cout << "distortion updatecallback" << std::endl;
[31]	228	sceneCamera->setViewMatrix( viewer->getCamera()->getViewMatrix() );
	229	sceneCamera->setProjectionMatrix( viewer->getCamera()->getProjectionMatrix() );
	230	}
	231
	232	void visual_distortion::toggleDistortion()
	233	{
	234	// Toggle
	235	//// If not Distorted: enabled distortion
	236	if( !distortionEnabled )
	237	{
	238	distortionEnabled = true;
	239	viewer->setSceneData( distortedGraph );
	240	}
	241	else // .. otherwise disable distortion
	242	{
	243	distortionEnabled = false;
	244	viewer->setSceneData( cleanGraph );
	245	}
	246	}
	247
	248
	249	osg::Group* visual_distortion::createPreRenderSubGraph(osg::Group* subgraph, const osg::Vec4& clearColor )
	250	{
	251	if (!subgraph) return 0;
	252
	253	// create a group to contain the flag and the pre rendering camera.
	254	osg::Group* parent = new osg::Group;
	255
	256	// texture to render to and to use for rendering of flag.
[305]	257	//osg::Texture* texture = 0;
	258	osg::Texture2D* texture = new osg::Texture2D;
	259	texture->setTextureSize(tex_width, tex_height);
	260	texture->setInternalFormat(GL_RGBA);
	261	texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
	262	texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
	263
	264	//texture = texture2D;
[31]	265
	266	if (useHDR)
	267	{
	268	texture->setInternalFormat(GL_RGBA16F_ARB);
	269	texture->setSourceFormat(GL_RGBA);
	270	texture->setSourceType(GL_FLOAT);
	271	}
	272
	273	// load a distortion map texture file
	274	if ( osgDB::fileExists( distortMapFileName ) )
	275	distortMapTexture = loadTexture(distortMapFileName);
	276	else
	277	{
	278	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;
	279	exit(-1);
	280	}
	281
	282	// load a blend map texture file
	283	if ( osgDB::fileExists( blendMapFileName ) )
	284	blendMapTexture = loadTexture(blendMapFileName);
	285	else
	286	{
	287	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;
	288	exit(-1);
	289	}
	290
	291	// set up the plane to render the rendered view.
	292	{
	293	// create the quad to visualize.
	294	osg::Geometry* polyGeom = new osg::Geometry();
	295
	296	polyGeom->setSupportsDisplayList(false);
	297
	298	osg::Vec3 origin(0.0f,0.0f,0.0f);
	299	osg::Vec3 xAxis(1.0f,0.0f,0.0f);
	300	osg::Vec3 yAxis(0.0f,1.0f,0.0f);
	301	osg::Vec3 zAxis(0.0f,0.0f,1.0f);
[305]	302	float width = 1600.0f;
	303	float height = 900.0f;
[31]	304	int noSteps = 128;
	305	if (useShaderDistortion)
	306	noSteps = 2;
	307
	308	osg::Vec3Array* vertices = new osg::Vec3Array;
	309	osg::Vec2Array* texcoords = new osg::Vec2Array;
	310	osg::Vec2Array* texcoords2 = useShaderDistortion?NULL:(new osg::Vec2Array);
	311	osg::Vec4Array* colors = new osg::Vec4Array;
	312
	313	osg::Vec3 bottom = origin;
	314	osg::Vec3 dx = xAxis*(width/((float)(noSteps-1)));
	315	osg::Vec3 dy = yAxis*(height/((float)(noSteps-1)));
	316
	317	osg::Vec2 bottom_texcoord(0.0f,0.0f);
	318	osg::Vec2 dx_texcoord(1.0f/(float)(noSteps-1),0.0f);
	319	osg::Vec2 dy_texcoord(0.0f,1.0f/(float)(noSteps-1));
	320
	321	osg::Vec3 cursor = bottom;
	322	osg::Vec2 texcoord = bottom_texcoord;
	323	int i,j;
	324	for(i=0;i<noSteps;++i)
	325	{
	326	osg::Vec3 cursor = bottom+dy*(float)i;
	327	osg::Vec2 texcoord = bottom_texcoord+dy_texcoord*(float)i;
	328	for(j=0;j<noSteps;++j)
	329	{
	330	vertices->push_back(cursor);
	331	if (distortMapTexture && !useShaderDistortion)
	332	{
	333	osg::Vec2 imgcoord = osg::Vec2((distortMapTexture->getImage(0)->s()-1) * texcoord.x(),
	334	(distortMapTexture->getImage(0)->t()-1) * texcoord.y());
	335	unsigned char* pPixel = &distortMapTexture->getImage(0)->data()[(int)imgcoord.y()*distortMapTexture->getImage(0)->getRowSizeInBytes()+
	336	(int)imgcoord.x()*distortMapTexture->getImage(0)->getPixelSizeInBits()/8];
	337	texcoords->push_back(osg::Vec2(((float)pPixel[2] / 255.0f + (pPixel[0] % 16)) / 16.0f,
	338	1.0f - ((float)pPixel[1] / 255.0f + (pPixel[0] / 16)) / 16.0f));
	339	texcoords2->push_back(osg::Vec2(texcoord.x(), texcoord.y()));
	340	}
	341	else
	342	texcoords->push_back(osg::Vec2(texcoord.x(), texcoord.y()));
	343	colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
	344
	345	cursor += dx;
	346	texcoord += dx_texcoord;
	347	}
	348	}
	349
	350	// pass the created vertex array to the points geometry object.
	351	polyGeom->setVertexArray(vertices);
	352
	353	polyGeom->setColorArray(colors);
	354	polyGeom->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
	355	polyGeom->setTexCoordArray(0,texcoords);
	356	if (!useShaderDistortion)
	357	polyGeom->setTexCoordArray(2,texcoords2);
	358
	359	for(i=0;i<noSteps-1;++i)
	360	{
	361	osg::DrawElementsUShort* elements = new osg::DrawElementsUShort(osg::PrimitiveSet::QUAD_STRIP);
	362	for(j=0;j<noSteps;++j)
	363	{
	364	elements->push_back(j+(i+1)*noSteps);
	365	elements->push_back(j+(i)*noSteps);
	366	}
	367	polyGeom->addPrimitiveSet(elements);
	368	}
	369
	370	// new we need to add the texture to the Drawable, we do so by creating a
	371	// StateSet to contain the Texture StateAttribute.
	372	osg::StateSet* stateset = polyGeom->getOrCreateStateSet();
	373	stateset->setTextureAttributeAndModes(0, texture, osg::StateAttribute::ON);
	374	stateset->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
	375	stateset->setMode(GL_DEPTH_TEST, osg::StateAttribute::OFF);
	376
	377	osg::Geode* geode = new osg::Geode();
	378	geode->addDrawable(polyGeom);
	379
	380	if (useShaderDistortion)
	381	{
	382	// apply the distortion map texture
	383	if (distortMapTexture)
	384	geode->getOrCreateStateSet()->setTextureAttributeAndModes(1, distortMapTexture, osg::StateAttribute::ON);
	385	}
	386
	387	// apply the blend map texture
	388	if (blendMapTexture)
	389	geode->getOrCreateStateSet()->setTextureAttributeAndModes(2, blendMapTexture, osg::StateAttribute::ON);
	390
	391	// set up the camera to render the textured quad
	392	osg::Camera* camera = new osg::Camera;
	393
	394	// just inherit the main cameras view
	395	camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
	396	camera->setViewMatrix(osg::Matrix::identity());
[305]	397	camera->setProjectionMatrixAsOrtho2D(0,1600,0,900); /** \todo: use screen size dynamically */
	398
[31]	399	// set the camera to render before the main camera.
	400	camera->setRenderOrder(osg::Camera::POST_RENDER, 200);
[305]	401
[31]	402	// only clear the depth buffer
	403	camera->setClearMask(0);
	404
	405	// add subgraph to render
	406	camera->addChild(geode);
	407
	408	if (useShaderDistortion)
	409	{
	410	// create shaders for distortion
	411	osg::StateSet* ss = geode->getOrCreateStateSet();
	412
	413	osg::Program* distortProgram = new osg::Program;
	414	distortProgram->setName( "distortion" );
	415	osg::Shader* distortVertObj = new osg::Shader( osg::Shader::VERTEX );
	416	osg::Shader* distortFragObj = new osg::Shader( osg::Shader::FRAGMENT );
	417
[147]	418	if (loadShaderSource( distortVertObj, "../resources/distortion/shader.vert" ) &&
	419	loadShaderSource( distortFragObj, "../resources/distortion/shader.frag" ) &&
[31]	420	distortMapTexture)
	421	{
	422	distortProgram->addShader( distortFragObj );
	423	distortProgram->addShader( distortVertObj );
	424	ss->addUniform( new osg::Uniform("textureImage", 0) );
	425	ss->addUniform( new osg::Uniform("textureDistort", 1) );
	426	ss->addUniform( new osg::Uniform("textureBlend", 2) );
	427	ss->setAttributeAndModes(distortProgram, osg::StateAttribute::ON);
	428	}
	429	else
	430	{
	431	OSG_NOTIFY(osg::FATAL) << "##################################" << std::endl << "## Unable to activate ShaderDistortion!" << std::endl << "## ABORT" << std::endl << "##################################" << std::endl;
	432	exit(0);
	433	}
	434	}
	435
	436	parent->addChild(camera);
	437	}
	438
	439	// then create the camera node to do the render to texture
	440	{
	441	osg::Camera* camera = new osg::Camera;
	442
	443	// set up the background color and clear mask.
	444	camera->setClearColor(clearColor);
	445	camera->setClearMask(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
	446
	447
	448	// just inherit the main cameras view
	449	/* ABSOLUTE_RF required to make intersections possible.
	450	Disadvantage of ABOLUTE_RF : the maincameras view matrix and projection
	451	matrix has to copied to the PRE_RENDER camera by our self.
	452	Therefore an update callback is installed.
	453	*/
	454	camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
	455	camera->setProjectionMatrix(osg::Matrixd::identity());
	456	camera->setViewMatrix(osg::Matrixd::identity());
	457
	458	// set viewport
	459	camera->setViewport(0,0,tex_width,tex_height);
	460
	461	// set the camera to render before the main camera.
	462	camera->setRenderOrder(osg::Camera::PRE_RENDER, 0);
	463
	464	sceneCamera = camera;
	465
	466	// tell the camera to use OpenGL frame buffer object where supported.
[305]	467	camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
[31]	468
	469	// attach the texture and use it as the color buffer.
[305]	470	//camera->attach(osg::Camera::COLOR_BUFFER, texture); // No Multisampling/Antialiasing
	471	camera->attach(osg::Camera::COLOR_BUFFER, texture, 0, 0, false, 4, 4); // 4x Multisampling/Antialiasing
[31]	472
	473	// add subgraph to render
	474	camera->addChild(subgraph);
	475
	476	parent->addChild(camera);
	477	}
	478	return parent;
	479	}
	480
	481
	482	bool visual_distortion::loadShaderSource( osg::Shader* shader, const std::string& fileName )
	483	{
	484	std::string foundFileName = osgDB::findDataFile(fileName);
	485	if (foundFileName.length() != 0 )
	486	{
	487	return shader->loadShaderSourceFromFile( foundFileName.c_str() );
	488	}
	489
	490	OSG_NOTIFY(osg::WARN) << "File \"" << fileName << "\" not found." << std::endl;
	491
	492	return false;
	493	}
	494
	495	osg::Texture* visual_distortion::loadTexture( const std::string& fileName )
	496	{
	497	std::string foundFileName = osgDB::findDataFile(fileName);
	498	if (foundFileName.length() != 0 )
	499	{
	500	// load distortion map texture file
	501	osg::Image* image = osgDB::readImageFile(foundFileName);
	502	if (image)
	503	{
	504	osg::Texture2D* texture = new osg::Texture2D;
	505	texture->setImage(image);
	506	texture->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::NEAREST);
	507	texture->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::NEAREST);
	508	texture->setWrap(osg::Texture2D::WRAP_S, osg::Texture2D::CLAMP_TO_EDGE);
	509	texture->setWrap(osg::Texture2D::WRAP_T, osg::Texture2D::CLAMP_TO_EDGE);
	510	return texture;
	511	}
	512	}
	513
	514	OSG_NOTIFY(osg::WARN) << "File \"" << fileName << "\" not found." << std::endl;
	515
	516	return NULL;
	517	}

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source: osgVisual/trunk/src/distortion/visual_distortion.cpp @ 361

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