Changeset 1736 for OpenSceneGraph/trunk/examples/osgstereoimage/osgstereoimage.cpp

Timestamp:

03/22/03 21:35:11 (10 years ago)

Author:

robert

Message:

Revamp of the osgstereoimage demo to provide a presentation tool for up comming
"In Your Face" shows held at the Glasgow Science Center.

Files:

• OpenSceneGraph/trunk/examples/osgstereoimage/osgstereoimage.cpp (modified) (8 diffs)

OpenSceneGraph/trunk/examples/osgstereoimage/osgstereoimage.cpp

@@ -14 +14 @@
 #include <osgProducer/Viewer>
 #include <osgDB/ReadFile>
+#include <osgDB/WriteFile>
 #include <osgUtil/Optimizer>
 
@@ -19 +20 @@
 #include <osg/Notify>
 #include <osg/MatrixTransform>
-
+#include <osg/Switch>
+#include <osg/TexMat>
+#include <osg/Texture2D>
+
+
+
+typedef std::vector<std::string> FileList;
+
+class SlideEventHandler : public osgGA::GUIEventHandler, public osg::NodeCallback
+{
+public:
+
+    SlideEventHandler();
+    
+    META_Object(osgStereImageApp,SlideEventHandler);
+
+
+    void set(osg::Switch* sw, osg::TexMat* texmat,float timePerSlide, bool autoSteppingActive);
+
+    virtual void accept(osgGA::GUIEventHandlerVisitor& v) { v.visit(*this); }
+
+    virtual bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter&);
+    
+    virtual void getUsage(osg::ApplicationUsage& usage) const;
+
+    virtual void operator()(osg::Node* node, osg::NodeVisitor* nv);
+    
+    void nextSlide();
+    
+    void previousSlide();
+    
+    void scaleImage(float s);
+    
+    void rotateImage(float rx,float ry);
+
+
+protected:
+
+    ~SlideEventHandler() {}
+    SlideEventHandler(const SlideEventHandler&,const osg::CopyOp&) {}
+
+    osg::ref_ptr<osg::Switch>   _switch;
+    osg::ref_ptr<osg::TexMat>   _texmat;
+    bool                        _firstTraversal;
+    unsigned int                _activeSlide;
+    double                      _previousTime;
+    double                      _timePerSlide;
+    bool                        _autoSteppingActive;
+        
+};
+
+SlideEventHandler::SlideEventHandler():
+    _switch(0),
+    _texmat(0),
+    _firstTraversal(true),
+    _activeSlide(0),
+    _previousTime(-1.0f),
+    _timePerSlide(5.0),
+    _autoSteppingActive(false)
+{
+}
+
+void SlideEventHandler::set(osg::Switch* sw, osg::TexMat* texmat,float timePerSlide, bool autoSteppingActive)
+{
+    _switch = sw;
+    _switch->setUpdateCallback(this);
+
+    _texmat = texmat;
+
+    _timePerSlide = timePerSlide;
+    _autoSteppingActive = autoSteppingActive;    
+}
+
+bool SlideEventHandler::handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter&)
+{
+    switch(ea.getEventType())
+    {
+        case(osgGA::GUIEventAdapter::KEYDOWN):
+        {
+            if (ea.getKey()=='a')
+            {
+                _autoSteppingActive = !_autoSteppingActive;
+                _previousTime = ea.time();
+                return true;
+            }
+            else if (ea.getKey()=='n')
+            {
+                nextSlide();
+                return true;
+            }
+            else if (ea.getKey()=='p')
+            {
+                previousSlide();
+                return true;
+            }
+            else if (ea.getKey()=='z')
+            {
+                scaleImage(0.99f);
+                return true;
+            }
+            else if (ea.getKey()=='x')
+            {
+                scaleImage(1.01f);
+                return true;
+            }
+            else if (ea.getKey()==' ')
+            {
+                if (_texmat.valid()) _texmat->setMatrix(osg::Matrix::identity());
+                return true;
+            }
+            return false;
+        }
+        case(osgGA::GUIEventAdapter::DRAG):
+        case(osgGA::GUIEventAdapter::MOVE):
+        {
+            static int px = ea.getX();
+            static int py = ea.getY();
+            
+            int dx = ea.getX()-px;
+            int dy = ea.getY()-py;
+            
+            px = ea.getX();
+            py = ea.getY();
+            
+            rotateImage((float)dx/(float)(ea.getXmax()-ea.getXmin()),(float)dy/(float)(ea.getYmax()-ea.getYmin()));
+            
+            return true;
+        }
+
+        default:
+            return false;
+    }
+}
+
+void SlideEventHandler::getUsage(osg::ApplicationUsage& usage) const
+{
+    usage.addKeyboardMouseBinding("Space","Reset the image position to center");
+    usage.addKeyboardMouseBinding("a","Toggle on/off the automatic advancement for image to image");
+    usage.addKeyboardMouseBinding("n","Advance to next image");
+    usage.addKeyboardMouseBinding("p","Move to previous image");
+    usage.addKeyboardMouseBinding("z","Zoom into the image");
+    usage.addKeyboardMouseBinding("x","Zoom out of the image");
+}
+
+void SlideEventHandler::operator()(osg::Node* node, osg::NodeVisitor* nv)
+{
+    if (_autoSteppingActive && nv->getFrameStamp())
+    {
+        double time = nv->getFrameStamp()->getReferenceTime();
+        
+        if (_firstTraversal)
+        {
+            _firstTraversal = false;
+            _previousTime = time;
+        }
+        else if (time-_previousTime>_timePerSlide)
+        {
+            _previousTime = time;
+            
+            nextSlide();
+        }
+        
+    }
+
+    traverse(node,nv);
+}
+
+void SlideEventHandler::nextSlide()
+{
+    if (_switch->getNumChildren()==0) return;
+
+    ++_activeSlide;
+    if (_activeSlide>=_switch->getNumChildren()) _activeSlide = 0;
+
+    _switch->setSingleChildOn(_activeSlide);
+}
+
+void SlideEventHandler::previousSlide()
+{
+    if (_switch->getNumChildren()==0) return;
+
+    if (_activeSlide==0) _activeSlide = _switch->getNumChildren()-1;
+    else --_activeSlide;
+
+    _switch->setSingleChildOn(_activeSlide);
+}
+
+void SlideEventHandler::scaleImage(float s)
+{
+    if (_texmat.valid())
+    {
+        _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));
+    }
+}
+
+void SlideEventHandler::rotateImage(float rx,float ry)
+{
+    if (_texmat.valid())
+    {
+        const float scale = 0.5f;
+        _texmat->setMatrix(_texmat->getMatrix()*osg::Matrix::translate(-rx*scale,ry*scale,0.0f));
+    }
+}
+
+osg::Geode* createSectorForImage(osg::Image* image,float s,float t, float radius, float height, float length)
+{
+
+    int numSegments = 20;
+    float Theta = length/radius;
+    float dTheta = Theta/(float)(numSegments-1);
+    
+    float ThetaZero = height*s/(t*radius);
+    
+    // set up the texture.
+    osg::Texture2D* texture = new osg::Texture2D;
+    texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
+    texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
+    texture->setImage(image);
+
+    // set up the drawstate.
+    osg::StateSet* dstate = new osg::StateSet;
+    dstate->setMode(GL_CULL_FACE,osg::StateAttribute::OFF);
+    dstate->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
+    dstate->setTextureAttributeAndModes(0, texture,osg::StateAttribute::ON);
+
+    // set up the geoset.
+    osg::Geometry* geom = new osg::Geometry;
+    geom->setStateSet(dstate);
+
+    osg::Vec3Array* coords = new osg::Vec3Array();
+    osg::Vec2Array* tcoords = new osg::Vec2Array();
+   
+    int i;
+    float angle = -Theta/2.0f;
+    for(i=0;
+        i<numSegments;
+        ++i, angle+=dTheta)
+    {
+        coords->push_back(osg::Vec3(sinf(angle)*radius,cosf(angle)*radius,height*0.5f)); // top
+        coords->push_back(osg::Vec3(sinf(angle)*radius,cosf(angle)*radius,-height*0.5f)); // bottom.
+        
+        tcoords->push_back(osg::Vec2(angle/ThetaZero+0.5f,1.0f)); // top
+        tcoords->push_back(osg::Vec2(angle/ThetaZero+0.5f,0.0f)); // bottom.
+
+    }
+
+    osg::Vec4Array* colors = new osg::Vec4Array();
+    colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
+
+    osg::DrawArrays* elements = new osg::DrawArrays(osg::PrimitiveSet::QUAD_STRIP,0,coords->size());
+
+    
+
+    geom->setVertexArray(coords);
+    geom->setTexCoordArray(0,tcoords);
+    geom->setColorArray(colors);
+    geom->setColorBinding(osg::Geometry::BIND_OVERALL);
+
+    geom->addPrimitiveSet(elements);
+
+    // set up the geode.
+    osg::Geode* geode = new osg::Geode;
+    geode->addDrawable(geom);
+
+    return geode;
+
+}
+
+// create a switch containing a set of child each containing a 
+// stereo image pair.
+osg::Switch* createScene(const FileList& fileList, float radius, float height, float length)
+{
+    osg::Switch* sw = new osg::Switch;
+
+    // load the images.
+    for(unsigned int i=0;i+1<fileList.size();i+=2)
+    {
+        osg::ref_ptr<osg::Image> imageLeft = osgDB::readImageFile(fileList[i]);
+        osg::ref_ptr<osg::Image> imageRight = osgDB::readImageFile(fileList[i+1]);
+        if (imageLeft.valid() && imageRight.valid())
+        {
+            float average_s = (imageLeft->s()+imageRight->s())*0.5f;
+            float average_t = (imageLeft->t()+imageRight->t())*0.5f;
+
+            osg::Geode* geodeLeft = createSectorForImage(imageLeft.get(),average_s,average_t, radius, height, length);
+            geodeLeft->setNodeMask(0x01);
+
+            osg::Geode* geodeRight = createSectorForImage(imageRight.get(),average_s,average_t, radius, height, length);
+            geodeRight->setNodeMask(0x02);
+
+            osg::ref_ptr<osg::Group> imageGroup = new osg::Group;
+            
+            imageGroup->addChild(geodeLeft);
+            imageGroup->addChild(geodeRight);
+            
+            sw->addChild(imageGroup.get());
+        }
+        else
+        {
+            std::cout << "Warning: Unable to load both image files, '"<<fileList[i]<<"' & '"<<fileList[i+1]<<"', required for stereo imaging."<<std::endl;
+        }
+    }
+
+
+    if (sw->getNumChildren()>0)
+    {
+        // select first child.
+        sw->setSingleChildOn(0);
+    }
+
+    return sw;
+}
 
 int main( int argc, char **argv )
@@ -29 +341 @@
     // set up the usage document, in case we need to print out how to use this program.
     arguments.getApplicationUsage()->setCommandLineUsage(arguments.getProgramName()+" [options] image_file_left_eye image_file_right_eye");
+    arguments.getApplicationUsage()->addCommandLineOption("-d <float>","Time delay in sceonds between the display of successive image pairs when in auto advance mode.");
+    arguments.getApplicationUsage()->addCommandLineOption("-a","Enter auto advance of image pairs on start up.");
     arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
     
@@ -36 +350 @@
 
     // set up the value with sensible default event handlers.
-    viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
+    viewer.setUpViewer(osgProducer::Viewer::ESCAPE_SETS_DONE);
+
+    // register the handler to add keyboard and mosue handling.
+    SlideEventHandler* seh = new SlideEventHandler();
+    viewer.getEventHandlerList().push_front(seh);
+
 
     // get details on keyboard and mouse bindings used by the viewer.
     viewer.getUsage(*arguments.getApplicationUsage());
 
+    // read any time delay argument.
+    float timeDelayBetweenSlides = 5.0f;
+    while (arguments.read("-d",timeDelayBetweenSlides)) {}
+
+    bool autoSteppingActive = false;
+    while (arguments.read("-a")) autoSteppingActive = true;
+
+
     // if user request help write it out to cout.
     if (arguments.read("-h") || arguments.read("--help"))
@@ -59 +386 @@
 
     // extract the filenames from the arguments list.
-    std::string fileLeft,fileRight;
+    FileList fileList;
     for(int pos=1;pos<arguments.argc();++pos)
     {
-        if (arguments.isString(pos))
-        {
-            if (fileLeft.empty()) fileLeft = arguments[pos];
-            else if (fileRight.empty()) fileRight = arguments[pos];
-        }
-    }
-
-
-    if (fileLeft.empty() || fileRight.empty())
-    {
-        std::cout << arguments.getProgramName() <<": Please specify two image files required for stereo imaging."<<std::endl;
-        return 1;
-    }
-    
-    osg::Image* imageLeft = osgDB::readImageFile(fileLeft);
-    osg::Image* imageRight = osgDB::readImageFile(fileRight);
-    
-    if (!imageLeft || !imageRight)
-    {    
-        std::cout << arguments.getProgramName() <<": Unable to load two image files required for stereo imaging."<<std::endl;
-        return 1;
-    }
-    
-    float average_s = (imageLeft->s()+imageRight->s())*0.5f;
-    float average_t = (imageLeft->t()+imageRight->t())*0.5f;
-
-    osg::Geode* geodeLeft = osg::createGeodeForImage(imageLeft,average_s,average_t);
-    geodeLeft->setNodeMask(0x01);
-
-    osg::Geode* geodeRight = osg::createGeodeForImage(imageRight,average_s,average_t);
-    geodeRight->setNodeMask(0x02);
-
-    osg::ref_ptr<osg::Group> rootNode = new osg::Group;
-    rootNode->addChild(geodeLeft);
-    rootNode->addChild(geodeRight);
-
-    // set the scene to render
-    viewer.setSceneData(rootNode.get());
+        if (arguments.isString(pos)) fileList.push_back(arguments[pos]);
+    }
+
 
     // set up the use of stereo by default.
@@ -109 +401 @@
     viewer.realize(Producer::CameraGroup::ThreadPerCamera);
 
+    // now the windows have been realized we switch off the cursor to prevent it
+    // distracting the people seeing the stereo images.
+    float fovy = 1.0f;
+    for( unsigned int i = 0; i < viewer.getCameraConfig()->getNumberOfCameras(); i++ )
+    {
+        Producer::Camera* cam = viewer.getCameraConfig()->getCamera(i);
+        Producer::RenderSurface* rs = cam->getRenderSurface();
+        rs->useCursor(false);
+        fovy = cam->getLensVerticalFov();
+    }
+
+    float radius = 1.0f;
+    float height = 2*radius*tanf(fovy*0.5f);
+    float length = osg::PI*radius;  // half a cylinder.
+
+    // creat the scene from the file list.
+    osg::ref_ptr<osg::Switch> rootNode = createScene(fileList,radius,height,length);
+
+    // use a texure matrix to control the placement of the image.
+    osg::StateSet* stateset = rootNode->getOrCreateStateSet();
+    osg::TexMat* texmat = new osg::TexMat;
+    stateset->setTextureAttribute(0,texmat);
+
+
+    osgDB::writeNodeFile(*rootNode,"test.osg");
+
+    // set the scene to render
+    viewer.setSceneData(rootNode.get());
+
+
     // set all the sceneview's up so that their left and right add cull masks are set up.
     for(osgProducer::OsgCameraGroup::SceneHandlerList::iterator itr=viewer.getSceneHandlerList().begin();
@@ -118 +440 @@
         sceneview->setCullMaskLeft(0x00000001);
         sceneview->setCullMaskRight(0x00000002);
-    }
-
-
+        sceneview->setFusionDistance(osgUtil::SceneView::USE_FUSION_DISTANCE_VALUE,radius);
+        sceneview->setCamera(0);
+    }
+
+
+    // set up the SlideEventHandler.
+    seh->set(rootNode.get(),texmat,timeDelayBetweenSlides,autoSteppingActive);
+    
+    
+    osg::Matrix homePosition;
+    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));
+        
     while( !viewer.done() )
     {
@@ -130 +461 @@
         viewer.update();
          
+        viewer.setView(homePosition.ptr());
+
         // fire off the cull and draw traversals of the scene.
         viewer.frame();