119 lines
4.6 KiB
C++
119 lines
4.6 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OSGUTIL_UPDATEVISITOR
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#define OSGUTIL_UPDATEVISITOR 1
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#include <osg/NodeVisitor>
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#include <osg/Geode>
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#include <osg/Billboard>
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#include <osg/LOD>
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#include <osg/Switch>
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#include <osg/LightSource>
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#include <osg/Transform>
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#include <osg/Projection>
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#include <osg/OccluderNode>
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#include <osg/ScriptEngine>
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#include <osgUtil/Export>
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namespace osgUtil {
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/**
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* Basic UpdateVisitor implementation for animating a scene.
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* This visitor traverses the scene graph, calling each nodes appCallback if
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* it exists.
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*/
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class OSGUTIL_EXPORT UpdateVisitor : public osg::NodeVisitor
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{
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public:
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UpdateVisitor();
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virtual ~UpdateVisitor();
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META_NodeVisitor(osgUtil, UpdateVisitor)
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/** Convert 'this' into a osgUtil::UpdateVisitor pointer if Object is a osgUtil::UpdateVisitor, otherwise return 0.
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* Equivalent to dynamic_cast<osgUtil::UpdateVisitor*>(this).*/
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virtual osgUtil::UpdateVisitor* asUpdateVisitor() { return this; }
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/** convert 'const this' into a const osgUtil::UpdateVisitor pointer if Object is a osgUtil::UpdateVisitor, otherwise return 0.
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* Equivalent to dynamic_cast<const osgUtil::UpdateVisitor*>(this).*/
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virtual const osgUtil::UpdateVisitor* asUpdateVisitor() const { return this; }
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virtual void reset();
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/** During traversal each type of node calls its callbacks and its children traversed. */
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virtual void apply(osg::Node& node) { handle_callbacks_and_traverse(node); }
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virtual void apply(osg::Drawable& drawable)
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{
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osg::Callback* callback = drawable.getUpdateCallback();
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if (callback)
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{
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osg::DrawableUpdateCallback* drawable_callback = callback->asDrawableUpdateCallback();
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osg::NodeCallback* node_callback = callback->asNodeCallback();
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if (drawable_callback) drawable_callback->update(this,&drawable);
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if (node_callback) (*node_callback)(&drawable, this);
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if (!drawable_callback && !node_callback) callback->run(&drawable, this);
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}
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handle_callbacks(drawable.getStateSet());
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}
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// The following overrides are technically redundant as the default implementation would eventually trickle down to
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// apply(osg::Node&); - however defining these explicitly should save a couple of virtual function calls
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virtual void apply(osg::Geode& node) { handle_callbacks_and_traverse(node); }
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virtual void apply(osg::Billboard& node) { handle_callbacks_and_traverse(node); }
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virtual void apply(osg::LightSource& node) { handle_callbacks_and_traverse(node); }
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virtual void apply(osg::Group& node) { handle_callbacks_and_traverse(node); }
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virtual void apply(osg::Transform& node) { handle_callbacks_and_traverse(node); }
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virtual void apply(osg::Projection& node) { handle_callbacks_and_traverse(node); }
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virtual void apply(osg::Switch& node) { handle_callbacks_and_traverse(node); }
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virtual void apply(osg::LOD& node) { handle_callbacks_and_traverse(node); }
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virtual void apply(osg::OccluderNode& node) { handle_callbacks_and_traverse(node); }
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protected:
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// /** Prevent unwanted copy construction.*/
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// UpdateVisitor(const UpdateVisitor&):osg::NodeVisitor() {}
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/** Prevent unwanted copy operator.*/
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UpdateVisitor& operator = (const UpdateVisitor&) { return *this; }
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inline void handle_callbacks(osg::StateSet* stateset)
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{
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if (stateset && stateset->requiresUpdateTraversal())
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{
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stateset->runUpdateCallbacks(this);
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}
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}
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inline void handle_callbacks_and_traverse(osg::Node& node)
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{
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handle_callbacks(node.getStateSet());
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osg::Callback* callback = node.getUpdateCallback();
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if (callback) callback->run(&node,this);
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else if (node.getNumChildrenRequiringUpdateTraversal()>0) traverse(node);
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}
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};
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}
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#endif
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