2002-05-29 07:43:22 +08:00
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//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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2002-06-10 19:21:21 +08:00
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#ifndef OSG_SHADOWVOLUMEOCCLUDER
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#define OSG_SHADOWVOLUMEOCCLUDER 1
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#include <osg/ref_ptr>
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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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/** 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& soc):
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_quality(soc._quality),
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_nodePath(soc._nodePath),
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_occluderVolume(soc._occluderVolume),
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_holeList(soc._holeList) {}
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2002-06-12 21:54:14 +08:00
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ShadowVolumeOccluder(const NodePath& nodePath,const ConvexPlanerOccluder& occluder,const Matrix& MV,const Matrix& P)
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{
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computeOccluder(nodePath,occluder,MV,P);
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}
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/** compute the shadow volume occluder. */
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void computeOccluder(const NodePath& nodePath,const ConvexPlanerOccluder& occluder,const Matrix& MV,const Matrix& P);
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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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/** 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 quality() { return _quality; }
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2002-06-12 17:22:30 +08:00
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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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2002-06-04 01:49:28 +08:00
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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 _quality;
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NodePath _nodePath;
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Polytope _occluderVolume;
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HoleList _holeList;
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};
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inline void ShadowVolumeOccluder::disableResultMasks()
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{
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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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_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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}
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2002-05-29 07:43:22 +08:00
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} // end of namespace
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#endif
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