148 lines
4.7 KiB
Plaintext
148 lines
4.7 KiB
Plaintext
//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
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//Distributed under the terms of the GNU Library General Public License (LGPL)
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//as published by the Free Software Foundation.
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#ifndef OSG_SHADOWVOLUMEOCCLUDER
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#define OSG_SHADOWVOLUMEOCCLUDER 1
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#include <osg/Polytope>
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#include <osg/ConvexPlanerOccluder>
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#include <osg/Node>
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namespace osg {
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class CullStack;
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/** ShadowVolumeOccluder is a helper class for implementating shadow occlusion culling. */
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class SG_EXPORT ShadowVolumeOccluder
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{
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public:
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typedef std::vector<Polytope> HoleList;
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ShadowVolumeOccluder(const ShadowVolumeOccluder& svo):
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_volume(svo._volume),
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_nodePath(svo._nodePath),
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_projectionMatrix(svo._projectionMatrix),
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_occluderVolume(svo._occluderVolume),
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_holeList(svo._holeList) {}
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ShadowVolumeOccluder():
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_volume(0.0f) {}
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/** compute the shadow volume occluder. */
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bool computeOccluder(const NodePath& nodePath,const ConvexPlanerOccluder& occluder,CullStack& cullStack,bool createDrawables=false);
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inline void disableResultMasks();
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inline void pushCurrentMask();
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inline void popCurrentMask();
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/** return true if the matrix passed in matches the projection matrix that this ShaowVolumeOccluder is
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* associated with.*/
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bool matchProjectionMatrix(const osg::Matrix& matrix) const
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{
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if (_projectionMatrix.valid()) return matrix==*_projectionMatrix;
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else return false;
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}
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/** Set the NodePath which describes the which node in the scene graph
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* that this occluder was attached to.*/
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inline void setNodePath(NodePath& nodePath) { _nodePath = nodePath; }
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inline NodePath& getNodePath() { return _nodePath; }
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inline const NodePath& getNodePath() const { return _nodePath; }
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float getVolume() const { return _volume; }
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/** return true if the specified vertex list is contaned entirely
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* within this shadow occluder volume.*/
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bool contains(const std::vector<Vec3>& vertices);
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/** return true if the specified bounding sphere is contaned entirely
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* within this shadow occluder volume.*/
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bool contains(const BoundingSphere& bound);
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/** return true if the specified bounding box is contained entirely
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* within this shadow occluder volume.*/
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bool contains(const BoundingBox& bound);
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inline void transformProvidingInverse(const osg::Matrix& matrix)
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{
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_occluderVolume.transformProvidingInverse(matrix);
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for(HoleList::iterator itr=_holeList.begin();
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itr!=_holeList.end();
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++itr)
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{
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itr->transformProvidingInverse(matrix);
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}
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}
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protected:
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float _volume;
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NodePath _nodePath;
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ref_ptr<const Matrix> _projectionMatrix;
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Polytope _occluderVolume;
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HoleList _holeList;
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};
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/** A list of ShadowVolumeOccluder, used by CollectOccluderVisitor and CullVistor's.*/
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typedef std::vector<ShadowVolumeOccluder> ShadowVolumeOccluderList;
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inline void ShadowVolumeOccluder::disableResultMasks()
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{
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//std::cout<<"ShadowVolumeOccluder::disableResultMasks() - _occluderVolume.getMaskStack().size()="<<_occluderVolume.getMaskStack().size()<<" "<<_occluderVolume.getCurrentMask()<<std::endl;
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_occluderVolume.setResultMask(0);
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for(HoleList::iterator itr=_holeList.begin();
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itr!=_holeList.end();
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++itr)
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{
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itr->setResultMask(0);
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}
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}
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inline void ShadowVolumeOccluder::pushCurrentMask()
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{
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//std::cout<<"ShadowVolumeOccluder::pushCurrentMasks() - _occluderVolume.getMaskStack().size()="<<_occluderVolume.getMaskStack().size()<<" "<<_occluderVolume.getCurrentMask()<<std::endl;
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_occluderVolume.pushCurrentMask();
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if (!_holeList.empty())
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{
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for(HoleList::iterator itr=_holeList.begin();
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itr!=_holeList.end();
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++itr)
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{
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itr->pushCurrentMask();
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}
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}
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}
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inline void ShadowVolumeOccluder::popCurrentMask()
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{
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_occluderVolume.popCurrentMask();
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if (!_holeList.empty())
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{
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for(HoleList::iterator itr=_holeList.begin();
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itr!=_holeList.end();
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++itr)
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{
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itr->popCurrentMask();
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}
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}
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//std::cout<<"ShadowVolumeOccluder::popCurrentMasks() - _occluderVolume.getMaskStack().size()="<<_occluderVolume.getMaskStack().size()<<" "<<_occluderVolume.getCurrentMask()<<std::endl;
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}
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} // end of namespace
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#endif
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