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