OpenSceneGraph/include/osg/ShadowVolumeOccluder
Robert Osfield f36bc69c58 Made the more of the OSG's referenced object desctructors protected to ensure
that they arn't created on the stack inappropriately.

Split the implemention of Matrix up so that it is a simple no referenced counted
class and can be safefly created on the stack.  To support referenced counting a
seperate subclass now exists, this is RefMatrix which inherits from both Matrix and
Object.
2003-01-10 09:25:42 +00:00

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//C++ header - Open Scene Graph - Copyright (C) 1998-2002 Robert Osfield
//Distributed under the terms of the GNU Library General Public License (LGPL)
//as published by the Free Software Foundation.
#ifndef OSG_SHADOWVOLUMEOCCLUDER
#define OSG_SHADOWVOLUMEOCCLUDER 1
#include <osg/Polytope>
#include <osg/ConvexPlanarOccluder>
#include <osg/Node>
namespace osg {
class CullStack;
/** ShadowVolumeOccluder is a helper class for implementating shadow occlusion culling. */
class SG_EXPORT ShadowVolumeOccluder
{
public:
typedef std::vector<Polytope> HoleList;
ShadowVolumeOccluder(const ShadowVolumeOccluder& svo):
_volume(svo._volume),
_nodePath(svo._nodePath),
_projectionMatrix(svo._projectionMatrix),
_occluderVolume(svo._occluderVolume),
_holeList(svo._holeList) {}
ShadowVolumeOccluder():
_volume(0.0f) {}
bool operator < (const ShadowVolumeOccluder& svo) const { return getVolume()>svo.getVolume(); } // not greater volume first.
/** compute the shadow volume occluder. */
bool computeOccluder(const NodePath& nodePath,const ConvexPlanarOccluder& occluder,CullStack& cullStack,bool createDrawables=false);
inline void disableResultMasks();
inline void pushCurrentMask();
inline void popCurrentMask();
/** return true if the matrix passed in matches the projection matrix that this ShaowVolumeOccluder is
* associated with.*/
bool matchProjectionMatrix(const osg::Matrix& matrix) const
{
if (_projectionMatrix.valid()) return matrix==*_projectionMatrix;
else return false;
}
/** Set the NodePath which describes the which node in the scene graph
* that this occluder was attached to.*/
inline void setNodePath(NodePath& nodePath) { _nodePath = nodePath; }
inline NodePath& getNodePath() { return _nodePath; }
inline const NodePath& getNodePath() const { return _nodePath; }
/** get the volume of the occluder minus its holes, in eye coords, the volume is normalized by dividing by
* the volume of the view frustum in eye coords.*/
float getVolume() const { return _volume; }
/** return the occluder polytope.*/
Polytope& getOccluder() { return _occluderVolume; }
/** return the const occluder polytope.*/
const Polytope& getOccluder() const { return _occluderVolume; }
/** return the list of holes.*/
HoleList& getHoleList() { return _holeList; }
/** return the const list of holes.*/
const HoleList& getHoleList() const { return _holeList; }
/** return true if the specified vertex list is contaned entirely
* within this shadow occluder volume.*/
bool contains(const std::vector<Vec3>& vertices);
/** return true if the specified bounding sphere is contaned entirely
* within this shadow occluder volume.*/
bool contains(const BoundingSphere& bound);
/** return true if the specified bounding box is contained entirely
* within this shadow occluder volume.*/
bool contains(const BoundingBox& bound);
inline void transformProvidingInverse(const osg::Matrix& matrix)
{
_occluderVolume.transformProvidingInverse(matrix);
for(HoleList::iterator itr=_holeList.begin();
itr!=_holeList.end();
++itr)
{
itr->transformProvidingInverse(matrix);
}
}
protected:
float _volume;
NodePath _nodePath;
ref_ptr<const RefMatrix> _projectionMatrix;
Polytope _occluderVolume;
HoleList _holeList;
};
/** A list of ShadowVolumeOccluder, used by CollectOccluderVisitor and CullVistor's.*/
typedef std::vector<ShadowVolumeOccluder> ShadowVolumeOccluderList;
inline void ShadowVolumeOccluder::disableResultMasks()
{
//std::cout<<"ShadowVolumeOccluder::disableResultMasks() - _occluderVolume.getMaskStack().size()="<<_occluderVolume.getMaskStack().size()<<" "<<_occluderVolume.getCurrentMask()<<std::endl;
_occluderVolume.setResultMask(0);
for(HoleList::iterator itr=_holeList.begin();
itr!=_holeList.end();
++itr)
{
itr->setResultMask(0);
}
}
inline void ShadowVolumeOccluder::pushCurrentMask()
{
//std::cout<<"ShadowVolumeOccluder::pushCurrentMasks() - _occluderVolume.getMaskStack().size()="<<_occluderVolume.getMaskStack().size()<<" "<<_occluderVolume.getCurrentMask()<<std::endl;
_occluderVolume.pushCurrentMask();
if (!_holeList.empty())
{
for(HoleList::iterator itr=_holeList.begin();
itr!=_holeList.end();
++itr)
{
itr->pushCurrentMask();
}
}
}
inline void ShadowVolumeOccluder::popCurrentMask()
{
_occluderVolume.popCurrentMask();
if (!_holeList.empty())
{
for(HoleList::iterator itr=_holeList.begin();
itr!=_holeList.end();
++itr)
{
itr->popCurrentMask();
}
}
//std::cout<<"ShadowVolumeOccluder::popCurrentMasks() - _occluderVolume.getMaskStack().size()="<<_occluderVolume.getMaskStack().size()<<" "<<_occluderVolume.getCurrentMask()<<std::endl;
}
} // end of namespace
#endif