6a67be2e32
forcing users to use osgDB::readRef*File() methods. The later is preferable as it closes a potential threading bug when using paging databases in conjunction
with the osgDB::Registry Object Cache. This threading bug occurs when one thread gets an object from the Cache via an osgDB::read*File() call where only
a pointer to the object is passed back, so taking a reference to the object is delayed till it gets reassigned to a ref_ptr<>, but at the same time another
thread calls a flush of the Object Cache deleting this object as it's referenceCount is now zero. Using osgDB::readREf*File() makes sure the a ref_ptr<> is
passed back and the referenceCount never goes to zero.
To ensure the OSG builds when OSG_PROVIDE_READFILE is to OFF the many cases of osgDB::read*File() usage had to be replaced with a ref_ptr<> osgDB::readRef*File()
usage. The avoid this change causing lots of other client code to be rewritten to handle the use of ref_ptr<> in place of C pointer I introduced a serious of
templte methods in various class to adapt ref_ptr<> to the underly C pointer to be passed to old OSG API's, example of this is found in include/osg/Group:
bool addChild(Node* child); // old method which can only be used with a Node*
tempalte<class T> bool addChild(const osg::ref_ptr<T>& child) { return addChild(child.get()); } // adapter template method
These changes together cover 149 modified files, so it's a large submission. This extent of changes are warrent to make use of the Object Cache
and multi-threaded loaded more robust.
git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/branches/OpenSceneGraph-3.4@15165 16af8721-9629-0410-8352-f15c8da7e697
146 lines
4.5 KiB
C++
146 lines
4.5 KiB
C++
/* OpenSceneGraph example, osgclip.
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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/MatrixTransform>
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#include <osg/ClipNode>
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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 <osg/Material>
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#include <osg/PolygonOffset>
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#include <osg/PolygonMode>
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#include <osg/LineStipple>
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#include <osg/AnimationPath>
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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 <osgViewer/Viewer>
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#include <osgUtil/Optimizer>
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osg::ref_ptr<osg::Node> decorate_with_clip_node(const osg::ref_ptr<osg::Node>& subgraph)
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{
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osg::ref_ptr<osg::Group> rootnode = new osg::Group;
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// create wireframe view of the model so the user can see
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// what parts are being culled away.
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osg::StateSet* stateset = new osg::StateSet;
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//osg::Material* material = new osg::Material;
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osg::PolygonMode* polymode = new osg::PolygonMode;
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polymode->setMode(osg::PolygonMode::FRONT_AND_BACK,osg::PolygonMode::LINE);
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stateset->setAttributeAndModes(polymode,osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON);
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osg::Group* wireframe_subgraph = new osg::Group;
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wireframe_subgraph->setStateSet(stateset);
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wireframe_subgraph->addChild(subgraph);
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rootnode->addChild(wireframe_subgraph);
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/*
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// simple approach to adding a clipnode above a subgraph.
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// create clipped part.
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osg::ClipNode* clipped_subgraph = new osg::ClipNode;
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osg::BoundingSphere bs = subgraph->getBound();
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bs.radius()*= 0.4f;
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osg::BoundingBox bb;
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bb.expandBy(bs);
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clipped_subgraph->createClipBox(bb);
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clipped_subgraph->addChild(subgraph);
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rootnode->addChild(clipped_subgraph);
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*/
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// more complex approach to managing ClipNode, allowing
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// ClipNode node to be transformed independently from the subgraph
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// that it is clipping.
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osg::MatrixTransform* transform= new osg::MatrixTransform;
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osg::NodeCallback* nc = new osg::AnimationPathCallback(subgraph->getBound().center(),osg::Vec3(0.0f,0.0f,1.0f),osg::inDegrees(45.0f));
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transform->setUpdateCallback(nc);
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osg::ClipNode* clipnode = new osg::ClipNode;
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osg::BoundingSphere bs = subgraph->getBound();
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bs.radius()*= 0.4f;
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osg::BoundingBox bb;
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bb.expandBy(bs);
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clipnode->createClipBox(bb);
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clipnode->setCullingActive(false);
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transform->addChild(clipnode);
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rootnode->addChild(transform);
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// create clipped part.
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osg::Group* clipped_subgraph = new osg::Group;
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clipped_subgraph->setStateSet(clipnode->getStateSet());
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clipped_subgraph->addChild(subgraph);
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rootnode->addChild(clipped_subgraph);
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return rootnode;
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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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// load the nodes from the commandline arguments.
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osg::ref_ptr<osg::Node> loadedModel = 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 (!loadedModel) loadedModel = osgDB::readRefNodeFile("cow.osgt");
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if (!loadedModel)
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{
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osg::notify(osg::NOTICE)<<"Please specify a filename on the command line"<<std::endl;
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return 1;
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}
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// decorate the scenegraph with a clip node.
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osg::ref_ptr<osg::Node> rootnode = decorate_with_clip_node(loadedModel);
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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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osgViewer::Viewer viewer;
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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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