370 lines
16 KiB
C++
370 lines
16 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 OSG_NODEVISITOR
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#define OSG_NODEVISITOR 1
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#include <osg/Node>
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#include <osg/Matrix>
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#include <osg/FrameStamp>
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namespace osg {
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class Billboard;
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class ClearNode;
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class ClipNode;
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class CoordinateSystemNode;
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class Geode;
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class Group;
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class LightSource;
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class LOD;
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class MatrixTransform;
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class OccluderNode;
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class OcclusionQueryNode;
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class PagedLOD;
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class PositionAttitudeTransform;
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class Projection;
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class ProxyNode;
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class Sequence;
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class Switch;
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class TexGenNode;
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class Transform;
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class Camera;
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class CameraView;
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const unsigned int UNINITIALIZED_FRAME_NUMBER=0xffffffff;
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#define META_NodeVisitor(library,name) \
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virtual const char* libraryName() const { return #library; }\
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virtual const char* className() const { return #name; }
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/** Visitor for type safe operations on osg::Nodes.
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Based on GOF's Visitor pattern. The NodeVisitor
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is useful for developing type safe operations to nodes
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in the scene graph (as per Visitor pattern), and adds to this
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support for optional scene graph traversal to allow
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operations to be applied to whole scenes at once. The Visitor
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pattern uses a technique of double dispatch as a mechanism to
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call the appropriate apply(..) method of the NodeVisitor. To
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use this feature one must use the Node::accept(NodeVisitor) which
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is extended in each Node subclass, rather than the NodeVisitor
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apply directly. So use root->accept(myVisitor); instead of
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myVisitor.apply(*root). The later method will bypass the double
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dispatch and the appropriate NodeVisitor::apply(..) method will
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not be called. */
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class OSG_EXPORT NodeVisitor : public virtual Referenced
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{
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public:
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enum TraversalMode
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{
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TRAVERSE_NONE,
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TRAVERSE_PARENTS,
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TRAVERSE_ALL_CHILDREN,
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TRAVERSE_ACTIVE_CHILDREN
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};
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enum VisitorType
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{
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NODE_VISITOR = 0,
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UPDATE_VISITOR,
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EVENT_VISITOR,
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COLLECT_OCCLUDER_VISITOR,
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CULL_VISITOR
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};
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NodeVisitor(TraversalMode tm=TRAVERSE_NONE);
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NodeVisitor(VisitorType type,TraversalMode tm=TRAVERSE_NONE);
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virtual ~NodeVisitor();
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/** return the library name/namespapce of the visitor's. Should be defined by derived classes.*/
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virtual const char* libraryName() const { return "osg"; }
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/** return the name of the visitor's class type. Should be defined by derived classes.*/
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virtual const char* className() const { return "NodeVisitor"; }
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/** Method to call to reset visitor. Useful if your visitor accumulates
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state during a traversal, and you plan to reuse the visitor.
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To flush that state for the next traversal: call reset() prior
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to each traversal.*/
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virtual void reset() {}
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/** Set the VisitorType, used to distinguish different visitors during
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* traversal of the scene, typically used in the Node::traverse() method
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* to select which behaviour to use for different types of traversal/visitors.*/
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inline void setVisitorType(VisitorType type) { _visitorType = type; }
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/** Get the VisitorType.*/
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inline VisitorType getVisitorType() const { return _visitorType; }
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/** Set the traversal number. Typically used to denote the frame count.*/
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inline void setTraversalNumber(unsigned int fn) { _traversalNumber = fn; }
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/** Get the traversal number. Typically used to denote the frame count.*/
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inline unsigned int getTraversalNumber() const { return _traversalNumber; }
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/** Set the FrameStamp that this traversal is associated with.*/
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inline void setFrameStamp(FrameStamp* fs) { _frameStamp = fs; }
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/** Get the FrameStamp that this traversal is associated with.*/
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inline const FrameStamp* getFrameStamp() const { return _frameStamp.get(); }
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/** Set the TraversalMask of this NodeVisitor.
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* The TraversalMask is used by the NodeVisitor::validNodeMask() method
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* to determine whether to operate on a node and its subgraph.
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* validNodeMask() is called automatically in the Node::accept() method before
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* any call to NodeVisitor::apply(), apply() is only ever called if validNodeMask
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* returns true. Note, if NodeVisitor::_traversalMask is 0 then all operations
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* will be switched off for all nodes. Whereas setting both _traversalMask and
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* _nodeMaskOverride to 0xffffffff will allow a visitor to work on all nodes
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* regardless of their own Node::_nodeMask state.*/
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inline void setTraversalMask(Node::NodeMask mask) { _traversalMask = mask; }
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/** Get the TraversalMask.*/
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inline Node::NodeMask getTraversalMask() const { return _traversalMask; }
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/** Set the NodeMaskOverride mask.
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* Used in validNodeMask() to determine whether to operate on a node or its
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* subgraph, by OR'ing NodeVisitor::_nodeMaskOverride with the Node's own Node::_nodeMask.
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* Typically used to force on nodes which may have
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* been switched off by their own Node::_nodeMask.*/
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inline void setNodeMaskOverride(Node::NodeMask mask) { _nodeMaskOverride = mask; }
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/** Get the NodeMaskOverride mask.*/
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inline Node::NodeMask getNodeMaskOverride() const { return _nodeMaskOverride; }
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/** Method to called by Node and its subclass' Node::accept() method, if the result is true
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* it is used to cull operations of nodes and their subgraphs.
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* Return true if the result of a bit wise and of the NodeVisitor::_traversalMask
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* with the bit or between NodeVistor::_nodeMaskOverride and the Node::_nodeMask.
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* default values for _traversalMask is 0xffffffff, _nodeMaskOverride is 0x0,
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* and osg::Node::_nodeMask is 0xffffffff. */
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inline bool validNodeMask(const osg::Node& node) const
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{
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return (getTraversalMask() & (getNodeMaskOverride() | node.getNodeMask()))!=0;
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}
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/** Set the traversal mode for Node::traverse() to use when
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deciding which children of a node to traverse. If a
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NodeVisitor has been attached via setTraverseVisitor()
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and the new mode is not TRAVERSE_VISITOR then the attached
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visitor is detached. Default mode is TRAVERSE_NONE.*/
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inline void setTraversalMode(TraversalMode mode) { _traversalMode = mode; }
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/** Get the traversal mode.*/
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inline TraversalMode getTraversalMode() const { return _traversalMode; }
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/**
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* Set user data, data must be subclassed from Referenced to allow
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* automatic memory handling. If your own data isn't directly
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* subclassed from Referenced then create an adapter object
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* which points to your own objects and handles the memory addressing.
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*/
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inline void setUserData(Referenced* obj) { _userData = obj; }
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/** Get user data.*/
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inline Referenced* getUserData() { return _userData.get(); }
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/** Get const user data.*/
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inline const Referenced* getUserData() const { return _userData.get(); }
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/** Method for handling traversal of a nodes.
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If you intend to use the visitor for actively traversing
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the scene graph then make sure the accept() methods call
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this method unless they handle traversal directly.*/
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inline void traverse(Node& node)
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{
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if (_traversalMode==TRAVERSE_PARENTS) node.ascend(*this);
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else if (_traversalMode!=TRAVERSE_NONE) node.traverse(*this);
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}
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/** Method called by osg::Node::accept() method before
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* a call to the NodeVisitor::apply(..). The back of the list will,
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* therefore, be the current node being visited inside the apply(..),
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* and the rest of the list will be the parental sequence of nodes
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* from the top most node applied down the graph to the current node.
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* Note, the user does not typically call pushNodeOnPath() as it
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* will be called automatically by the Node::accept() method.*/
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inline void pushOntoNodePath(Node* node) { if (_traversalMode!=TRAVERSE_PARENTS) _nodePath.push_back(node); else _nodePath.insert(_nodePath.begin(),node); }
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/** Method called by osg::Node::accept() method after
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* a call to NodeVisitor::apply(..).
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* Note, the user does not typically call popFromNodePath() as it
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* will be called automatically by the Node::accept() method.*/
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inline void popFromNodePath() { if (_traversalMode!=TRAVERSE_PARENTS) _nodePath.pop_back(); else _nodePath.erase(_nodePath.begin()); }
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/** Get the non const NodePath from the top most node applied down
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* to the current Node being visited.*/
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NodePath& getNodePath() { return _nodePath; }
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/** Get the const NodePath from the top most node applied down
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* to the current Node being visited.*/
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const NodePath& getNodePath() const { return _nodePath; }
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/** Get the eye point in local coordinates.
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* Note, not all NodeVisitor implement this method, it is mainly cull visitors which will implement.*/
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virtual osg::Vec3 getEyePoint() const { return Vec3(0.0f,0.0f,0.0f); }
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/** Get the view point in local coordinates.
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* Note, not all NodeVisitor implement this method, it is mainly cull visitors which will implement.*/
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virtual osg::Vec3 getViewPoint() const { return getEyePoint(); }
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/** Get the distance from a point to the eye point, distance value in local coordinate system.
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* Note, not all NodeVisitor implement this method, it is mainly cull visitors which will implement.
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* If the getDistanceFromEyePoint(pos) is not implemented then a default value of 0.0 is returned.*/
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virtual float getDistanceToEyePoint(const Vec3& /*pos*/, bool /*useLODScale*/) const { return 0.0f; }
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/** Get the distance of a point from the eye point, distance value in the eye coordinate system.
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* Note, not all NodeVisitor implement this method, it is mainly cull visitors which will implement.
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* If the getDistanceFromEyePoint(pos) is not implemented than a default value of 0.0 is returned.*/
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virtual float getDistanceFromEyePoint(const Vec3& /*pos*/, bool /*useLODScale*/) const { return 0.0f; }
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/** Get the distance from a point to the view point, distance value in local coordinate system.
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* Note, not all NodeVisitor implement this method, it is mainly cull visitors which will implement.
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* If the getDistanceToViewPoint(pos) is not implemented then a default value of 0.0 is returned.*/
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virtual float getDistanceToViewPoint(const Vec3& /*pos*/, bool /*useLODScale*/) const { return 0.0f; }
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virtual void apply(Node& node);
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virtual void apply(Geode& node);
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virtual void apply(Billboard& node);
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virtual void apply(Group& node);
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virtual void apply(ProxyNode& node);
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virtual void apply(Projection& node);
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virtual void apply(CoordinateSystemNode& node);
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virtual void apply(ClipNode& node);
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virtual void apply(TexGenNode& node);
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virtual void apply(LightSource& node);
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virtual void apply(Transform& node);
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virtual void apply(Camera& node);
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virtual void apply(CameraView& node);
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virtual void apply(MatrixTransform& node);
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virtual void apply(PositionAttitudeTransform& node);
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virtual void apply(Switch& node);
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virtual void apply(Sequence& node);
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virtual void apply(LOD& node);
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virtual void apply(PagedLOD& node);
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virtual void apply(ClearNode& node);
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virtual void apply(OccluderNode& node);
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virtual void apply(OcclusionQueryNode& node);
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/** Callback for managing database paging, such as generated by PagedLOD nodes.*/
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class DatabaseRequestHandler : public osg::Referenced
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{
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public:
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DatabaseRequestHandler():
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Referenced(true) {}
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virtual void requestNodeFile(const std::string& fileName, osg::NodePath& nodePath, float priority, const FrameStamp* framestamp, osg::ref_ptr<osg::Referenced>& databaseRequest, const osg::Referenced* options=0) = 0;
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protected:
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virtual ~DatabaseRequestHandler() {}
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};
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/** Set the handler for database requests.*/
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void setDatabaseRequestHandler(DatabaseRequestHandler* handler) { _databaseRequestHandler = handler; }
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/** Get the handler for database requests.*/
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DatabaseRequestHandler* getDatabaseRequestHandler() { return _databaseRequestHandler.get(); }
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/** Get the const handler for database requests.*/
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const DatabaseRequestHandler* getDatabaseRequestHandler() const { return _databaseRequestHandler.get(); }
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/** Callback for managing image paging, such as generated by PagedLOD nodes.*/
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class ImageRequestHandler : public osg::Referenced
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{
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public:
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ImageRequestHandler():
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Referenced(true) {}
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virtual double getPreLoadTime() const = 0;
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virtual osg::Image* readImageFile(const std::string& fileName) = 0;
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virtual void requestImageFile(const std::string& fileName,osg::Object* attachmentPoint, int attachmentIndex, double timeToMergeBy, const FrameStamp* framestamp, osg::ref_ptr<osg::Referenced>& imageRequest, const osg::Referenced* options=0) = 0;
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protected:
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virtual ~ImageRequestHandler() {}
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};
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/** Set the handler for image requests.*/
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void setImageRequestHandler(ImageRequestHandler* handler) { _imageRequestHandler = handler; }
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/** Get the handler for image requests.*/
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ImageRequestHandler* getImageRequestHandler() { return _imageRequestHandler.get(); }
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/** Get the const handler for image requests.*/
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const ImageRequestHandler* getImageRequestHandler() const { return _imageRequestHandler.get(); }
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protected:
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VisitorType _visitorType;
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unsigned int _traversalNumber;
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ref_ptr<FrameStamp> _frameStamp;
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TraversalMode _traversalMode;
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Node::NodeMask _traversalMask;
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Node::NodeMask _nodeMaskOverride;
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NodePath _nodePath;
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ref_ptr<Referenced> _userData;
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ref_ptr<DatabaseRequestHandler> _databaseRequestHandler;
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ref_ptr<ImageRequestHandler> _imageRequestHandler;
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};
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/** Convenience functor for assisting visiting of arrays of osg::Node's.*/
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class NodeAcceptOp
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{
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public:
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NodeAcceptOp(NodeVisitor& nv):_nv(nv) {}
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NodeAcceptOp(const NodeAcceptOp& naop):_nv(naop._nv) {}
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void operator () (Node* node) { node->accept(_nv); }
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void operator () (ref_ptr<Node> node) { node->accept(_nv); }
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protected:
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NodeAcceptOp& operator = (const NodeAcceptOp&) { return *this; }
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NodeVisitor& _nv;
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};
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}
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#endif
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