305 lines
10 KiB
C++
305 lines
10 KiB
C++
/* OpenSceneGraph example, osgmultitexture.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <osg/Notify>
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#include <osg/Texture2D>
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#include <osg/io_utils>
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#include <osgDB/Registry>
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#include <osgDB/ReadFile>
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#include <osgFX/MultiTextureControl>
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#include <osgGA/TerrainManipulator>
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#include <osgGA/StateSetManipulator>
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#include <osgGA/AnimationPathManipulator>
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#include <osgGA/TrackballManipulator>
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#include <osgGA/FlightManipulator>
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#include <osgGA/DriveManipulator>
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#include <osgGA/KeySwitchMatrixManipulator>
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#include <osgGA/StateSetManipulator>
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#include <osgGA/AnimationPathManipulator>
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#include <osgGA/TerrainManipulator>
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#include <osgTerrain/Terrain>
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#include <osgViewer/ViewerEventHandlers>
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#include <osgViewer/Viewer>
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#include <iostream>
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template<class T>
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class FindTopMostNodeOfTypeVisitor : public osg::NodeVisitor
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{
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public:
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FindTopMostNodeOfTypeVisitor():
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osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN),
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_foundNode(0)
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{}
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void apply(osg::Node& node)
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{
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T* result = dynamic_cast<T*>(&node);
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if (result)
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{
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_foundNode = result;
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}
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else
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{
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traverse(node);
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}
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}
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T* _foundNode;
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};
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template<class T>
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T* findTopMostNodeOfType(osg::Node* node)
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{
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if (!node) return 0;
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FindTopMostNodeOfTypeVisitor<T> fnotv;
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node->accept(fnotv);
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return fnotv._foundNode;
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}
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/** Callback used to track the elevation of the camera and update the texture weights in an MultiTextureControl node.*/
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class ElevationLayerBlendingCallback : public osg::NodeCallback
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{
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public:
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typedef std::vector<double> Elevations;
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ElevationLayerBlendingCallback(osgFX::MultiTextureControl* mtc, const Elevations& elevations, float animationTime=4.0f):
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_previousFrame(-1),
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_previousTime(0.0),
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_mtc(mtc),
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_elevations(elevations),
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_animationTime(animationTime) {}
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/** Callback method called by the NodeVisitor when visiting a node.*/
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virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
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{
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if (!nv->getFrameStamp() || _previousFrame==nv->getFrameStamp()->getFrameNumber())
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{
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// we've already updated for this frame so no need to do it again, just traverse children.
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traverse(node,nv);
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return;
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}
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OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);
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float deltaTime = 0.01f;
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if (_previousFrame!=-1)
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{
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deltaTime = float(nv->getFrameStamp()->getReferenceTime() - _previousTime);
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}
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_previousTime = nv->getFrameStamp()->getReferenceTime();
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_previousFrame = nv->getFrameStamp()->getFrameNumber();
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double elevation = nv->getViewPoint().z();
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osg::CoordinateSystemNode* csn = dynamic_cast<osg::CoordinateSystemNode*>(node);
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if (csn)
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{
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osg::EllipsoidModel* em = csn->getEllipsoidModel();
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if (em)
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{
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double X = nv->getViewPoint().x();
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double Y = nv->getViewPoint().y();
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double Z = nv->getViewPoint().z();
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double latitude, longitude;
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em->convertXYZToLatLongHeight(X,Y,Z,latitude, longitude, elevation);
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}
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}
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if (_mtc.valid() && !_elevations.empty())
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{
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unsigned int index = _mtc->getNumTextureWeights()-1;
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for(unsigned int i=0; i<_elevations.size(); ++i)
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{
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if (elevation>_elevations[i])
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{
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index = i;
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break;
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}
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}
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float delta = std::min(deltaTime/_animationTime, 1.0f);
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for(unsigned int i=0; i<_mtc->getNumTextureWeights(); ++i)
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{
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float currentValue = _mtc->getTextureWeight(i);
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float desiredValue = (i==index) ? 1.0f : 0.0f;
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if (desiredValue != currentValue)
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{
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if (currentValue<desiredValue)
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{
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desiredValue = std::min(currentValue + delta, desiredValue);
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}
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else
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{
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desiredValue = std::max(currentValue - delta, desiredValue);
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}
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_mtc->setTextureWeight(i, desiredValue);
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}
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}
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}
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traverse(node,nv);
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}
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int _previousFrame;
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double _previousTime;
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float _animationTime;
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osg::observer_ptr<osgFX::MultiTextureControl> _mtc;
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Elevations _elevations;
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OpenThreads::Mutex _mutex;
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};
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int main( int argc, char **argv )
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{
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// use an ArgumentParser object to manage the program arguments.
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osg::ArgumentParser arguments(&argc,argv);
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// construct the viewer.
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osgViewer::Viewer viewer(arguments);
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// add all the event handlers to the viewer
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{
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// add the state manipulator
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viewer.addEventHandler( new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet()) );
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// add the thread model handler
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viewer.addEventHandler(new osgViewer::ThreadingHandler);
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// add the window size toggle handler
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viewer.addEventHandler(new osgViewer::WindowSizeHandler);
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// add the stats handler
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viewer.addEventHandler(new osgViewer::StatsHandler);
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// add the help handler
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viewer.addEventHandler(new osgViewer::HelpHandler(arguments.getApplicationUsage()));
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// add the record camera path handler
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viewer.addEventHandler(new osgViewer::RecordCameraPathHandler);
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// add the LOD Scale handler
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viewer.addEventHandler(new osgViewer::LODScaleHandler);
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}
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// add all the camera manipulators
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{
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osg::ref_ptr<osgGA::KeySwitchMatrixManipulator> keyswitchManipulator = new osgGA::KeySwitchMatrixManipulator;
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keyswitchManipulator->addMatrixManipulator( '1', "Trackball", new osgGA::TrackballManipulator() );
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keyswitchManipulator->addMatrixManipulator( '2', "Flight", new osgGA::FlightManipulator() );
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keyswitchManipulator->addMatrixManipulator( '3', "Drive", new osgGA::DriveManipulator() );
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unsigned int num = keyswitchManipulator->getNumMatrixManipulators();
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keyswitchManipulator->addMatrixManipulator( '4', "Terrain", new osgGA::TerrainManipulator() );
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std::string pathfile;
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char keyForAnimationPath = '5';
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while (arguments.read("-p",pathfile))
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{
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osgGA::AnimationPathManipulator* apm = new osgGA::AnimationPathManipulator(pathfile);
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if (apm || !apm->valid())
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{
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num = keyswitchManipulator->getNumMatrixManipulators();
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keyswitchManipulator->addMatrixManipulator( keyForAnimationPath, "Path", apm );
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++keyForAnimationPath;
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}
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}
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keyswitchManipulator->selectMatrixManipulator(num);
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viewer.setCameraManipulator( keyswitchManipulator.get() );
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}
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// set up the scene graph
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{
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// load the nodes from the commandline arguments.
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osg::Node* rootnode = osgDB::readNodeFiles(arguments);
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if (!rootnode)
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{
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osg::notify(osg::NOTICE)<<"Warning: no valid data loaded, please specify a database on the command line."<<std::endl;
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return 1;
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}
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osgTerrain::Terrain* terrain = findTopMostNodeOfType<osgTerrain::Terrain>(rootnode);
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if (!terrain)
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{
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terrain = new osgTerrain::Terrain;
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terrain->addChild(rootnode);
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rootnode = terrain;
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}
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osg::CoordinateSystemNode* csn = findTopMostNodeOfType<osg::CoordinateSystemNode>(rootnode);
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unsigned int numLayers = 1;
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osgFX::MultiTextureControl* mtc = findTopMostNodeOfType<osgFX::MultiTextureControl>(rootnode);
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if (mtc)
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{
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numLayers = mtc->getNumTextureWeights();
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}
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if (numLayers<2)
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{
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osg::notify(osg::NOTICE)<<"Warning: scene must have MultiTextureControl node with at least 2 texture units defined."<<std::endl;
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return 1;
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}
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double maxElevationTransition = 1e6;
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ElevationLayerBlendingCallback::Elevations elevations;
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for(unsigned int i=0; i<numLayers; ++i)
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{
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elevations.push_back(maxElevationTransition);
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maxElevationTransition /= 2.0;
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}
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ElevationLayerBlendingCallback* elbc = new ElevationLayerBlendingCallback(mtc, elevations);
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// assign to the most appropriate node (the CoordinateSystemNode is best as it provides the elevation on the globe.)
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if (csn) csn->setCullCallback(elbc);
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else if (mtc) mtc->setCullCallback(elbc);
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else rootnode->setCullCallback(elbc);
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// add a viewport to the viewer and attach the scene graph.
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viewer.setSceneData( rootnode );
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}
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// create the windows and run the threads.
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viewer.realize();
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return viewer.run();
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}
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