Revamp of the osgstereoimage demo to provide a presentation tool for up comming
"In Your Face" shows held at the Glasgow Science Center.
This commit is contained in:
Robert Osfield
@@ -13,13 +13,325 @@
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#include <osgProducer/Viewer>
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#include <osgDB/ReadFile>
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#include <osgDB/WriteFile>
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#include <osgUtil/Optimizer>
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#include <osg/Geode>
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#include <osg/Notify>
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#include <osg/MatrixTransform>
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#include <osg/Switch>
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#include <osg/TexMat>
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#include <osg/Texture2D>
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typedef std::vector<std::string> FileList;
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class SlideEventHandler : public osgGA::GUIEventHandler, public osg::NodeCallback
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{
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public:
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SlideEventHandler();
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META_Object(osgStereImageApp,SlideEventHandler);
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void set(osg::Switch* sw, osg::TexMat* texmat,float timePerSlide, bool autoSteppingActive);
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virtual void accept(osgGA::GUIEventHandlerVisitor& v) { v.visit(*this); }
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virtual bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter&);
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virtual void getUsage(osg::ApplicationUsage& usage) const;
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virtual void operator()(osg::Node* node, osg::NodeVisitor* nv);
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void nextSlide();
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void previousSlide();
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void scaleImage(float s);
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void rotateImage(float rx,float ry);
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protected:
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~SlideEventHandler() {}
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SlideEventHandler(const SlideEventHandler&,const osg::CopyOp&) {}
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osg::ref_ptr<osg::Switch> _switch;
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osg::ref_ptr<osg::TexMat> _texmat;
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bool _firstTraversal;
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unsigned int _activeSlide;
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double _previousTime;
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double _timePerSlide;
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bool _autoSteppingActive;
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};
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SlideEventHandler::SlideEventHandler():
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_switch(0),
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_texmat(0),
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_firstTraversal(true),
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_activeSlide(0),
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_previousTime(-1.0f),
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_timePerSlide(5.0),
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_autoSteppingActive(false)
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{
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}
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void SlideEventHandler::set(osg::Switch* sw, osg::TexMat* texmat,float timePerSlide, bool autoSteppingActive)
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{
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_switch = sw;
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_switch->setUpdateCallback(this);
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_texmat = texmat;
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_timePerSlide = timePerSlide;
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_autoSteppingActive = autoSteppingActive;
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}
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bool SlideEventHandler::handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter&)
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{
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switch(ea.getEventType())
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{
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case(osgGA::GUIEventAdapter::KEYDOWN):
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{
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if (ea.getKey()=='a')
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{
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_autoSteppingActive = !_autoSteppingActive;
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_previousTime = ea.time();
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return true;
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}
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else if (ea.getKey()=='n')
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{
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nextSlide();
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return true;
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}
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else if (ea.getKey()=='p')
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{
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previousSlide();
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return true;
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}
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else if (ea.getKey()=='z')
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{
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scaleImage(0.99f);
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return true;
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}
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else if (ea.getKey()=='x')
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{
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scaleImage(1.01f);
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return true;
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}
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else if (ea.getKey()==' ')
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{
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if (_texmat.valid()) _texmat->setMatrix(osg::Matrix::identity());
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return true;
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}
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return false;
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}
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case(osgGA::GUIEventAdapter::DRAG):
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case(osgGA::GUIEventAdapter::MOVE):
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{
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static int px = ea.getX();
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static int py = ea.getY();
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int dx = ea.getX()-px;
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int dy = ea.getY()-py;
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px = ea.getX();
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py = ea.getY();
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rotateImage((float)dx/(float)(ea.getXmax()-ea.getXmin()),(float)dy/(float)(ea.getYmax()-ea.getYmin()));
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return true;
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}
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default:
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return false;
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}
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}
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void SlideEventHandler::getUsage(osg::ApplicationUsage& usage) const
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{
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usage.addKeyboardMouseBinding("Space","Reset the image position to center");
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usage.addKeyboardMouseBinding("a","Toggle on/off the automatic advancement for image to image");
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usage.addKeyboardMouseBinding("n","Advance to next image");
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usage.addKeyboardMouseBinding("p","Move to previous image");
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usage.addKeyboardMouseBinding("z","Zoom into the image");
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usage.addKeyboardMouseBinding("x","Zoom out of the image");
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}
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void SlideEventHandler::operator()(osg::Node* node, osg::NodeVisitor* nv)
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{
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if (_autoSteppingActive && nv->getFrameStamp())
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{
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double time = nv->getFrameStamp()->getReferenceTime();
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if (_firstTraversal)
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{
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_firstTraversal = false;
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_previousTime = time;
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}
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else if (time-_previousTime>_timePerSlide)
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{
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_previousTime = time;
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nextSlide();
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}
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}
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traverse(node,nv);
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}
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void SlideEventHandler::nextSlide()
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{
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if (_switch->getNumChildren()==0) return;
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++_activeSlide;
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if (_activeSlide>=_switch->getNumChildren()) _activeSlide = 0;
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_switch->setSingleChildOn(_activeSlide);
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}
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void SlideEventHandler::previousSlide()
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{
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if (_switch->getNumChildren()==0) return;
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if (_activeSlide==0) _activeSlide = _switch->getNumChildren()-1;
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else --_activeSlide;
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_switch->setSingleChildOn(_activeSlide);
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}
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void SlideEventHandler::scaleImage(float s)
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{
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if (_texmat.valid())
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{
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_texmat->setMatrix(_texmat->getMatrix()*osg::Matrix::translate(-0.5f,-0.5f,0.0f)*osg::Matrix::scale(s,s,1.0f)*osg::Matrix::translate(0.5f,0.5f,0.0f));
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}
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}
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void SlideEventHandler::rotateImage(float rx,float ry)
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{
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if (_texmat.valid())
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{
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const float scale = 0.5f;
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_texmat->setMatrix(_texmat->getMatrix()*osg::Matrix::translate(-rx*scale,ry*scale,0.0f));
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}
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}
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osg::Geode* createSectorForImage(osg::Image* image,float s,float t, float radius, float height, float length)
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{
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int numSegments = 20;
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float Theta = length/radius;
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float dTheta = Theta/(float)(numSegments-1);
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float ThetaZero = height*s/(t*radius);
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// set up the texture.
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osg::Texture2D* texture = new osg::Texture2D;
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texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
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texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
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texture->setImage(image);
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// set up the drawstate.
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osg::StateSet* dstate = new osg::StateSet;
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dstate->setMode(GL_CULL_FACE,osg::StateAttribute::OFF);
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dstate->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
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dstate->setTextureAttributeAndModes(0, texture,osg::StateAttribute::ON);
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// set up the geoset.
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osg::Geometry* geom = new osg::Geometry;
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geom->setStateSet(dstate);
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osg::Vec3Array* coords = new osg::Vec3Array();
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osg::Vec2Array* tcoords = new osg::Vec2Array();
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int i;
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float angle = -Theta/2.0f;
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for(i=0;
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i<numSegments;
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++i, angle+=dTheta)
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{
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coords->push_back(osg::Vec3(sinf(angle)*radius,cosf(angle)*radius,height*0.5f)); // top
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coords->push_back(osg::Vec3(sinf(angle)*radius,cosf(angle)*radius,-height*0.5f)); // bottom.
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tcoords->push_back(osg::Vec2(angle/ThetaZero+0.5f,1.0f)); // top
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tcoords->push_back(osg::Vec2(angle/ThetaZero+0.5f,0.0f)); // bottom.
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}
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osg::Vec4Array* colors = new osg::Vec4Array();
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colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
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osg::DrawArrays* elements = new osg::DrawArrays(osg::PrimitiveSet::QUAD_STRIP,0,coords->size());
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geom->setVertexArray(coords);
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geom->setTexCoordArray(0,tcoords);
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geom->setColorArray(colors);
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geom->setColorBinding(osg::Geometry::BIND_OVERALL);
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geom->addPrimitiveSet(elements);
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// set up the geode.
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osg::Geode* geode = new osg::Geode;
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geode->addDrawable(geom);
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return geode;
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}
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// create a switch containing a set of child each containing a
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// stereo image pair.
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osg::Switch* createScene(const FileList& fileList, float radius, float height, float length)
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{
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osg::Switch* sw = new osg::Switch;
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// load the images.
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for(unsigned int i=0;i+1<fileList.size();i+=2)
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{
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osg::ref_ptr<osg::Image> imageLeft = osgDB::readImageFile(fileList[i]);
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osg::ref_ptr<osg::Image> imageRight = osgDB::readImageFile(fileList[i+1]);
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if (imageLeft.valid() && imageRight.valid())
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{
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float average_s = (imageLeft->s()+imageRight->s())*0.5f;
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float average_t = (imageLeft->t()+imageRight->t())*0.5f;
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osg::Geode* geodeLeft = createSectorForImage(imageLeft.get(),average_s,average_t, radius, height, length);
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geodeLeft->setNodeMask(0x01);
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osg::Geode* geodeRight = createSectorForImage(imageRight.get(),average_s,average_t, radius, height, length);
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geodeRight->setNodeMask(0x02);
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osg::ref_ptr<osg::Group> imageGroup = new osg::Group;
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imageGroup->addChild(geodeLeft);
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imageGroup->addChild(geodeRight);
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sw->addChild(imageGroup.get());
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}
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else
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{
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std::cout << "Warning: Unable to load both image files, '"<<fileList[i]<<"' & '"<<fileList[i+1]<<"', required for stereo imaging."<<std::endl;
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}
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}
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if (sw->getNumChildren()>0)
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{
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// select first child.
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sw->setSingleChildOn(0);
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}
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return sw;
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}
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int main( int argc, char **argv )
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{
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@@ -28,6 +340,8 @@ int main( int argc, char **argv )
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// set up the usage document, in case we need to print out how to use this program.
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arguments.getApplicationUsage()->setCommandLineUsage(arguments.getProgramName()+" [options] image_file_left_eye image_file_right_eye");
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arguments.getApplicationUsage()->addCommandLineOption("-d <float>","Time delay in sceonds between the display of successive image pairs when in auto advance mode.");
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arguments.getApplicationUsage()->addCommandLineOption("-a","Enter auto advance of image pairs on start up.");
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arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
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@@ -35,11 +349,24 @@ int main( int argc, char **argv )
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osgProducer::Viewer viewer(arguments);
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// set up the value with sensible default event handlers.
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viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
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viewer.setUpViewer(osgProducer::Viewer::ESCAPE_SETS_DONE);
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// register the handler to add keyboard and mosue handling.
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SlideEventHandler* seh = new SlideEventHandler();
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viewer.getEventHandlerList().push_front(seh);
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// get details on keyboard and mouse bindings used by the viewer.
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viewer.getUsage(*arguments.getApplicationUsage());
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// read any time delay argument.
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float timeDelayBetweenSlides = 5.0f;
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while (arguments.read("-d",timeDelayBetweenSlides)) {}
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bool autoSteppingActive = false;
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while (arguments.read("-a")) autoSteppingActive = true;
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// if user request help write it out to cout.
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if (arguments.read("-h") || arguments.read("--help"))
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{
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@@ -58,48 +385,13 @@ int main( int argc, char **argv )
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}
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// extract the filenames from the arguments list.
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std::string fileLeft,fileRight;
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FileList fileList;
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for(int pos=1;pos<arguments.argc();++pos)
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{
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if (arguments.isString(pos))
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{
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if (fileLeft.empty()) fileLeft = arguments[pos];
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else if (fileRight.empty()) fileRight = arguments[pos];
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}
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if (arguments.isString(pos)) fileList.push_back(arguments[pos]);
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}
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if (fileLeft.empty() || fileRight.empty())
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{
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std::cout << arguments.getProgramName() <<": Please specify two image files required for stereo imaging."<<std::endl;
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return 1;
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}
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osg::Image* imageLeft = osgDB::readImageFile(fileLeft);
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osg::Image* imageRight = osgDB::readImageFile(fileRight);
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if (!imageLeft || !imageRight)
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{
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std::cout << arguments.getProgramName() <<": Unable to load two image files required for stereo imaging."<<std::endl;
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return 1;
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}
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float average_s = (imageLeft->s()+imageRight->s())*0.5f;
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float average_t = (imageLeft->t()+imageRight->t())*0.5f;
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osg::Geode* geodeLeft = osg::createGeodeForImage(imageLeft,average_s,average_t);
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geodeLeft->setNodeMask(0x01);
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osg::Geode* geodeRight = osg::createGeodeForImage(imageRight,average_s,average_t);
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geodeRight->setNodeMask(0x02);
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osg::ref_ptr<osg::Group> rootNode = new osg::Group;
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rootNode->addChild(geodeLeft);
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rootNode->addChild(geodeRight);
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// set the scene to render
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viewer.setSceneData(rootNode.get());
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// set up the use of stereo by default.
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osg::DisplaySettings* ds = viewer.getDisplaySettings();
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if (!ds) ds = osg::DisplaySettings::instance();
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@@ -108,6 +400,36 @@ int main( int argc, char **argv )
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// create the windows and run the threads.
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viewer.realize(Producer::CameraGroup::ThreadPerCamera);
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// now the windows have been realized we switch off the cursor to prevent it
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// distracting the people seeing the stereo images.
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float fovy = 1.0f;
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for( unsigned int i = 0; i < viewer.getCameraConfig()->getNumberOfCameras(); i++ )
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{
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Producer::Camera* cam = viewer.getCameraConfig()->getCamera(i);
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Producer::RenderSurface* rs = cam->getRenderSurface();
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rs->useCursor(false);
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fovy = cam->getLensVerticalFov();
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}
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float radius = 1.0f;
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float height = 2*radius*tanf(fovy*0.5f);
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float length = osg::PI*radius; // half a cylinder.
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// creat the scene from the file list.
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osg::ref_ptr<osg::Switch> rootNode = createScene(fileList,radius,height,length);
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// use a texure matrix to control the placement of the image.
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osg::StateSet* stateset = rootNode->getOrCreateStateSet();
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osg::TexMat* texmat = new osg::TexMat;
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stateset->setTextureAttribute(0,texmat);
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osgDB::writeNodeFile(*rootNode,"test.osg");
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// set the scene to render
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viewer.setSceneData(rootNode.get());
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// set all the sceneview's up so that their left and right add cull masks are set up.
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for(osgProducer::OsgCameraGroup::SceneHandlerList::iterator itr=viewer.getSceneHandlerList().begin();
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itr!=viewer.getSceneHandlerList().end();
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@@ -117,9 +439,18 @@ int main( int argc, char **argv )
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sceneview->setCullMask(0xffffffff);
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sceneview->setCullMaskLeft(0x00000001);
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sceneview->setCullMaskRight(0x00000002);
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sceneview->setFusionDistance(osgUtil::SceneView::USE_FUSION_DISTANCE_VALUE,radius);
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sceneview->setCamera(0);
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}
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// set up the SlideEventHandler.
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seh->set(rootNode.get(),texmat,timeDelayBetweenSlides,autoSteppingActive);
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osg::Matrix homePosition;
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homePosition.makeLookAt(osg::Vec3(0.0f,0.0f,0.0f),osg::Vec3(0.0f,1.0f,0.0f),osg::Vec3(0.0f,0.0f,1.0f));
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while( !viewer.done() )
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{
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// wait for all cull and draw threads to complete.
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@@ -129,6 +460,8 @@ int main( int argc, char **argv )
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// call all node update callbacks and animations.
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viewer.update();
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viewer.setView(homePosition.ptr());
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// fire off the cull and draw traversals of the scene.
|
||||
viewer.frame();
|
||||
|
||||
|
||||
Reference in New Issue
Block a user