155 lines
4.7 KiB
C++
155 lines
4.7 KiB
C++
#include <osgViewer/Viewer>
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#include <osg/Transform>
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#include <osg/Billboard>
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#include <osg/Geode>
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#include <osg/Group>
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#include <osg/Notify>
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#include <osgDB/Registry>
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#include <osgDB/ReadFile>
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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 <osgUtil/Optimizer>
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#include <iostream>
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class UpdateCallback : public osg::NodeCallback
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{
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virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
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{
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std::cout<<"update callback - pre traverse"<<node<<std::endl;
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traverse(node,nv);
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std::cout<<"update callback - post traverse"<<node<<std::endl;
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}
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};
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class CullCallback : public osg::NodeCallback
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{
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virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
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{
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std::cout<<"cull callback - pre traverse"<<node<<std::endl;
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traverse(node,nv);
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std::cout<<"cull callback - post traverse"<<node<<std::endl;
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}
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};
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class DrawableDrawCallback : public osg::Drawable::DrawCallback
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{
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virtual void drawImplementation(osg::State& state,const osg::Drawable* drawable) const
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{
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std::cout<<"draw call back - pre drawImplementation"<<drawable<<std::endl;
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drawable->drawImplementation(state);
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std::cout<<"draw call back - post drawImplementation"<<drawable<<std::endl;
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}
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};
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struct DrawableUpdateCallback : public osg::Drawable::UpdateCallback
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{
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virtual void update(osg::NodeVisitor*, osg::Drawable* drawable)
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{
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std::cout<<"Drawable update callback "<<drawable<<std::endl;
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}
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};
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struct DrawableCullCallback : public osg::Drawable::CullCallback
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{
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/** do customized cull code.*/
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virtual bool cull(osg::NodeVisitor*, osg::Drawable* drawable, osg::State* /*state*/) const
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{
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std::cout<<"Drawable cull callback "<<drawable<<std::endl;
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return false;
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}
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};
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class InsertCallbacksVisitor : public osg::NodeVisitor
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{
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public:
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InsertCallbacksVisitor():osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN)
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{
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}
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virtual void apply(osg::Node& node)
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{
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node.setUpdateCallback(new UpdateCallback());
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node.setCullCallback(new CullCallback());
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traverse(node);
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}
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virtual void apply(osg::Geode& geode)
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{
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geode.setUpdateCallback(new UpdateCallback());
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//note, it makes no sense to attach a cull callback to the node
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//at there are no nodes to traverse below the geode, only
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//drawables, and as such the Cull node callbacks is ignored.
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//If you wish to control the culling of drawables
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//then use a drawable cullback...
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for(unsigned int i=0;i<geode.getNumDrawables();++i)
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{
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geode.getDrawable(i)->setUpdateCallback(new DrawableUpdateCallback());
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geode.getDrawable(i)->setCullCallback(new DrawableCullCallback());
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geode.getDrawable(i)->setDrawCallback(new DrawableDrawCallback());
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}
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}
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virtual void apply(osg::Transform& node)
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{
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apply((osg::Node&)node);
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}
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};
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class MyReadFileCallback : public osgDB::Registry::ReadFileCallback
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{
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public:
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virtual osgDB::ReaderWriter::ReadResult readNode(const std::string& fileName, const osgDB::ReaderWriter::Options* options)
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{
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std::cout<<"before readNode"<<std::endl;
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// note when calling the Registry to do the read you have to call readNodeImplementation NOT readNode, as this will
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// cause on infinite recusive loop.
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osgDB::ReaderWriter::ReadResult result = osgDB::Registry::instance()->readNodeImplementation(fileName,options);
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std::cout<<"after readNode"<<std::endl;
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return result;
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}
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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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// set the osgDB::Registy the read file callback to catch all requests for reading files.
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osgDB::Registry::instance()->setReadFileCallback(new MyReadFileCallback());
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// initialize the viewer.
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osgViewer::Viewer viewer;
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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)<<"Please specify a file on the command line"<<std::endl;
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return 1;
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}
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// run optimization over the scene graph
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osgUtil::Optimizer optimzer;
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optimzer.optimize(rootnode);
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// insert all the callbacks
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InsertCallbacksVisitor icv;
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rootnode->accept(icv);
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// set the scene to render
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viewer.setSceneData(rootnode);
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return viewer.run();
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}
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