281 lines
9.1 KiB
C++
281 lines
9.1 KiB
C++
/* OpenSceneGraph example, osgcallback.
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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 <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::RenderInfo& renderInfo,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(renderInfo);
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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::DrawableUpdateCallback
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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::DrawableCullCallback
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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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class CameraUpdateCallback : 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<<"Camera update callback - pre traverse"<<node<<std::endl;
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traverse(node,nv);
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std::cout<<"Camera update callback - post traverse"<<node<<std::endl;
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}
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};
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class CameraEventCallback : 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<<"Camera event callback - pre traverse"<<node<<std::endl;
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traverse(node,nv);
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std::cout<<"Camera event callback - post traverse"<<node<<std::endl;
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}
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};
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struct TestDrawableUpdateCallback : public osg::DrawableUpdateCallback
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{
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TestDrawableUpdateCallback(const std::string &message): _message(message) {}
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virtual void update(osg::NodeVisitor*, osg::Drawable* /*drw*/) {
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printf("%s\n", _message.c_str());
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}
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std::string _message;
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};
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struct TestNodeUpdateCallback : public osg::NodeCallback
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{
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TestNodeUpdateCallback(const std::string &message): _message(message) {}
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virtual void operator()(osg::Node* /*node*/, osg::NodeVisitor* /*nv*/) {
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printf("%s\n", _message.c_str());
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}
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std::string _message;
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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 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::ref_ptr<osg::Node> rootnode;
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if (arguments.read("--test"))
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{
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osg::ref_ptr<osg::Group> root = new osg::Group();
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rootnode = root;
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osg::Node *test1 = new osg::Node();
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test1->setUpdateCallback(new TestNodeUpdateCallback("test1"));
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root->addChild(test1);
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osg::Drawable *test2 = new osg::Drawable();
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test2->osg::Node::setUpdateCallback(new TestNodeUpdateCallback("test2"));
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root->addChild(test2);
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osg::Drawable *test3 = new osg::Drawable();
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test3->setUpdateCallback(new TestDrawableUpdateCallback("test3"));
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root->addChild(test3);
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osg::Geode *test4 = new osg::Geode();
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osg::Drawable *drawable1 = new osg::Drawable();
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drawable1->osg::Node::setUpdateCallback(new TestNodeUpdateCallback("test4"));
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test4->addDrawable(drawable1);
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root->addChild(test4);
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osg::Geode *test5 = new osg::Geode();
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osg::Drawable *drawable2 = new osg::Drawable();
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drawable2->setUpdateCallback(new TestDrawableUpdateCallback("test5"));
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test5->addDrawable(drawable2);
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root->addChild(test5);
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osg::Geode *test6 = new osg::Geode();
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osg::Drawable *drawable3 = new osg::Drawable();
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drawable3->setUpdateCallback(new TestDrawableUpdateCallback("test6"));
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test6->addChild(drawable3);
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root->addChild(test6);
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osg::Geode *test7 = new osg::Geode();
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osg::Drawable *drawable4 = new osg::Drawable();
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drawable4->osg::Node::setUpdateCallback(new TestNodeUpdateCallback("test7"));
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test7->addChild(drawable4);
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root->addChild(test7);
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printf("Numchildren with updates %u\n", rootnode->getNumChildrenRequiringUpdateTraversal());
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}
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else
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{
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rootnode = osgDB::readRefNodeFiles(arguments);
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// if not loaded assume no arguments passed in, try use default mode instead.
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if (!rootnode) rootnode = osgDB::readRefNodeFile("cow.osgt");
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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.get());
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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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}
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viewer.getCamera()->setUpdateCallback(new CameraUpdateCallback());
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viewer.getCamera()->setEventCallback(new CameraEventCallback());
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// set the scene to render
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viewer.setSceneData(rootnode.get());
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viewer.setCameraManipulator(new osgGA::TrackballManipulator);
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viewer.realize();
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while(!viewer.done())
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{
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OSG_NOTICE<<std::endl<<"New Frame"<<std::endl;
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viewer.frame();
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}
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return 0;
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}
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