215 lines
8.1 KiB
C++
215 lines
8.1 KiB
C++
/* -*-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_INTERSECTIONVISITOR
|
|
#define OSGUTIL_INTERSECTIONVISITOR 1
|
|
|
|
#include <osg/NodeVisitor>
|
|
#include <osg/Drawable>
|
|
#include <osgUtil/Export>
|
|
|
|
#include <list>
|
|
|
|
namespace osgUtil
|
|
{
|
|
|
|
// forward declare to allow Intersector to reference it.
|
|
class IntersectionVisitor;
|
|
|
|
/** Pure virtual base class for implementating custom intersection technique.
|
|
* To implement a specific intersection technique on must override all
|
|
* the pure virtue methods, concrete examples of how to do this can be seen in
|
|
* the LineSegmentIntersector. */
|
|
class Intersector : public osg::Referenced
|
|
{
|
|
public:
|
|
|
|
enum CoordinateFrame
|
|
{
|
|
WINDOW,
|
|
PROJECTION,
|
|
VIEW,
|
|
MODEL
|
|
};
|
|
|
|
Intersector(CoordinateFrame cf=MODEL):
|
|
_coordinateFrame(cf),
|
|
_disabledCount(0) {}
|
|
|
|
void setCoordinateFrame(CoordinateFrame cf) { _coordinateFrame = cf; }
|
|
|
|
CoordinateFrame getCoordinateFrame() const { return _coordinateFrame; }
|
|
|
|
|
|
virtual Intersector* clone(osgUtil::IntersectionVisitor& iv) = 0;
|
|
|
|
virtual bool enter(const osg::Node& node) = 0;
|
|
|
|
virtual void leave() = 0;
|
|
|
|
virtual void intersect(osgUtil::IntersectionVisitor& iv, osg::Drawable* drawable) = 0;
|
|
|
|
virtual void reset() { _disabledCount = 0; }
|
|
|
|
virtual bool containsIntersections() = 0;
|
|
|
|
inline bool disabled() const { return _disabledCount!=0; }
|
|
|
|
inline void incrementDisabledCount() { ++_disabledCount; }
|
|
|
|
inline void decrementDisabledCount() { if (_disabledCount>0) --_disabledCount; }
|
|
|
|
protected:
|
|
|
|
CoordinateFrame _coordinateFrame;
|
|
unsigned int _disabledCount;
|
|
|
|
};
|
|
|
|
|
|
/** Concrent class for passing multiple intersectors through the scene graph.
|
|
* To be used in conjunction with IntersectionVisitor. */
|
|
class OSGUTIL_EXPORT IntersectorGroup : public Intersector
|
|
{
|
|
public:
|
|
|
|
IntersectorGroup();
|
|
|
|
/** Add an Intersector. */
|
|
void addIntersector(Intersector* intersector);
|
|
|
|
typedef std::vector< osg::ref_ptr<Intersector> > Intersectors;
|
|
|
|
/** Get the list of intersector. */
|
|
Intersectors& getIntersectors() { return _intersectors; }
|
|
|
|
/** Clear the list of intersectors.*/
|
|
void clear();
|
|
|
|
public:
|
|
|
|
virtual Intersector* clone(osgUtil::IntersectionVisitor& iv);
|
|
|
|
virtual bool enter(const osg::Node& node);
|
|
|
|
virtual void leave();
|
|
|
|
virtual void intersect(osgUtil::IntersectionVisitor& iv, osg::Drawable* drawable);
|
|
|
|
virtual void reset();
|
|
|
|
virtual bool containsIntersections();
|
|
|
|
protected:
|
|
|
|
Intersectors _intersectors;
|
|
|
|
};
|
|
|
|
/** InteresectionVisitor is used to testing for intersections with the scene, traversing the scene using generic osgUtil::Intersector's to test against the scene.
|
|
* To implement different types of intersection techniques, one implements custom versions of the osgUtil::Intersector, and then
|
|
* pass the constructed intersector to the IntersectionVisitor.*/
|
|
class OSGUTIL_EXPORT IntersectionVisitor : public osg::NodeVisitor
|
|
{
|
|
public:
|
|
|
|
/** Callback used to implement the reading of external files, allowing support for paged databases to be
|
|
* intergrated with IntersectionVisitor. A concrete implementation can be found in osgDB.
|
|
* Note, this loose coupling approach is required as osgUtil is independent from osgDB where the file reading
|
|
* is implemented, and osgDB itself is dependent upon osgUtil so a circular dependency would result from
|
|
* tighter integration.*/
|
|
struct ReadCallback : public osg::Referenced
|
|
{
|
|
virtual osg::Node* readNodeFile(const std::string& filename) = 0;
|
|
};
|
|
|
|
|
|
IntersectionVisitor(Intersector* intersector=0, ReadCallback* readCallback=0);
|
|
|
|
virtual void reset();
|
|
|
|
/** Set the intersector that will be used to intersect with the scene, and to store any hits that occur.*/
|
|
void setIntersector(Intersector* intersector);
|
|
|
|
/** Get the intersector that will be used to intersect with the scene, and to store any hits that occur.*/
|
|
Intersector* getIntersector() { return _intersectorStack.empty() ? 0 : _intersectorStack.front().get(); }
|
|
|
|
/** Get the const intersector that will be used to intersect with the scene, and to store any hits that occur.*/
|
|
const Intersector* getIntersector() const { return _intersectorStack.empty() ? 0 : _intersectorStack.front().get(); }
|
|
|
|
|
|
/** Set the read callback.*/
|
|
void setReadCallback(ReadCallback* rc) { _readCallback = rc; }
|
|
|
|
/** Get the read callback.*/
|
|
ReadCallback* getReadCallback() { return _readCallback.get(); }
|
|
|
|
/** Get the const read callback.*/
|
|
const ReadCallback* getReadCallback() const { return _readCallback.get(); }
|
|
|
|
|
|
void pushWindowMatrix(osg::RefMatrix* matrix) { _windowStack.push_back(matrix); }
|
|
void pushWindowMatrix(osg::Viewport* viewport) { _windowStack.push_back(new osg::RefMatrix( viewport->computeWindowMatrix()) ); }
|
|
void popWindowMatrix() { _windowStack.pop_back(); }
|
|
osg::RefMatrix* getWindowMatrix() { return _windowStack.empty() ? 0 : _windowStack.back().get(); }
|
|
|
|
void pushProjectionMatrix(osg::RefMatrix* matrix) { _projectionStack.push_back(matrix); }
|
|
void popProjectionMatrix() { _projectionStack.pop_back(); }
|
|
osg::RefMatrix* getProjectionMatrix() { return _projectionStack.empty() ? 0 : _projectionStack.back().get(); }
|
|
|
|
void pushViewMatrix(osg::RefMatrix* matrix) { _viewStack.push_back(matrix); }
|
|
void popViewMatrix() { _viewStack.pop_back(); }
|
|
osg::RefMatrix* getViewMatrix() { return _viewStack.empty() ? 0 : _viewStack.back().get(); }
|
|
|
|
void pushModelMatrix(osg::RefMatrix* matrix) { _modelStack.push_back(matrix); }
|
|
void popModelMatrix() { _modelStack.pop_back(); }
|
|
osg::RefMatrix* getModelMatrix() { return _modelStack.empty() ? 0 : _modelStack.back().get(); }
|
|
|
|
public:
|
|
|
|
virtual void apply(osg::Node& node);
|
|
virtual void apply(osg::Geode& geode);
|
|
virtual void apply(osg::Billboard& geode);
|
|
virtual void apply(osg::Group& group);
|
|
virtual void apply(osg::LOD& lod);
|
|
virtual void apply(osg::PagedLOD& lod);
|
|
virtual void apply(osg::Transform& transform);
|
|
virtual void apply(osg::Projection& projection);
|
|
virtual void apply(osg::Camera& camera);
|
|
|
|
protected:
|
|
|
|
inline bool enter(const osg::Node& node) { return _intersectorStack.empty() ? false : _intersectorStack.back()->enter(node); }
|
|
inline void leave() { _intersectorStack.back()->leave(); }
|
|
inline void intersect(osg::Drawable* drawable) { _intersectorStack.back()->intersect(*this, drawable); }
|
|
inline void push_clone() { _intersectorStack.push_back ( _intersectorStack.front()->clone(*this) ); }
|
|
inline void pop_clone() { if (_intersectorStack.size()>=2) _intersectorStack.pop_back(); }
|
|
|
|
typedef std::list< osg::ref_ptr<Intersector> > IntersectorStack;
|
|
IntersectorStack _intersectorStack;
|
|
|
|
osg::ref_ptr<ReadCallback> _readCallback;
|
|
|
|
typedef std::list< osg::ref_ptr<osg::RefMatrix> > MatrixStack;
|
|
MatrixStack _windowStack;
|
|
MatrixStack _projectionStack;
|
|
MatrixStack _viewStack;
|
|
MatrixStack _modelStack;
|
|
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|
|
|