| 1 | /* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield |
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| 2 | * |
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| 3 | * This library is open source and may be redistributed and/or modified under |
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| 4 | * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or |
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| 5 | * (at your option) any later version. The full license is in LICENSE file |
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| 6 | * included with this distribution, and on the openscenegraph.org website. |
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| 7 | * |
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| 8 | * This library is distributed in the hope that it will be useful, |
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| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 11 | * OpenSceneGraph Public License for more details. |
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| 12 | */ |
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| 13 | |
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| 14 | #ifndef OSG_COLLECTOCCLUDERSVISITOR |
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| 15 | #define OSG_COLLECTOCCLUDERSVISITOR 1 |
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| 16 | |
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| 17 | #include <osg/NodeVisitor> |
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| 18 | #include <osg/CullStack> |
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| 19 | |
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| 20 | #include <set> |
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| 21 | |
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| 22 | namespace osg { |
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| 23 | |
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| 24 | class OSG_EXPORT CollectOccludersVisitor : public osg::NodeVisitor, public osg::CullStack |
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| 25 | { |
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| 26 | public: |
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| 27 | |
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| 28 | |
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| 29 | typedef std::set<ShadowVolumeOccluder> ShadowVolumeOccluderSet; |
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| 30 | |
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| 31 | CollectOccludersVisitor(); |
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| 32 | virtual ~CollectOccludersVisitor(); |
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| 33 | |
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| 34 | META_NodeVisitor("osg","CollectOccludersVisitor") |
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| 35 | |
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| 36 | virtual CollectOccludersVisitor* cloneType() const { return new CollectOccludersVisitor(); } |
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| 37 | |
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| 38 | virtual void reset(); |
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| 39 | |
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| 40 | virtual float getDistanceToEyePoint(const Vec3& pos, bool withLODScale) const; |
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| 41 | virtual float getDistanceToViewPoint(const Vec3& pos, bool withLODScale) const; |
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| 42 | |
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| 43 | virtual float getDistanceFromEyePoint(const Vec3& pos, bool withLODScale) const; |
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| 44 | |
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| 45 | virtual void apply(osg::Node&); |
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| 46 | virtual void apply(osg::Transform& node); |
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| 47 | virtual void apply(osg::Projection& node); |
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| 48 | |
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| 49 | virtual void apply(osg::Switch& node); |
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| 50 | virtual void apply(osg::LOD& node); |
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| 51 | virtual void apply(osg::OccluderNode& node); |
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| 52 | |
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| 53 | /** Sets the minimum shadow occluder volume that an active occluder |
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| 54 | * must have. vol is units relative the clip space volume where 1.0 |
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| 55 | * is the whole clip space. */ |
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| 56 | void setMinimumShadowOccluderVolume(float vol) { _minimumShadowOccluderVolume = vol; } |
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| 57 | float getMinimumShadowOccluderVolume() const { return _minimumShadowOccluderVolume; } |
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| 58 | |
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| 59 | /** Sets the maximum number of occluders to have active for culling |
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| 60 | * purposes. */ |
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| 61 | void setMaximumNumberOfActiveOccluders(unsigned int num) { _maximumNumberOfActiveOccluders = num; } |
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| 62 | unsigned int getMaximumNumberOfActiveOccluders() const { return _maximumNumberOfActiveOccluders; } |
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| 63 | |
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| 64 | void setCreateDrawablesOnOccludeNodes(bool flag) { _createDrawables=flag; } |
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| 65 | bool getCreateDrawablesOnOccludeNodes() const { return _createDrawables; } |
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| 66 | |
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| 67 | void setCollectedOccluderSet(const ShadowVolumeOccluderSet& svol) { _occluderSet = svol; } |
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| 68 | ShadowVolumeOccluderSet& getCollectedOccluderSet() { return _occluderSet; } |
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| 69 | const ShadowVolumeOccluderSet& getCollectedOccluderSet() const { return _occluderSet; } |
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| 70 | |
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| 71 | /** Removes occluded occluders for the collected occluders list, then |
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| 72 | * discards all but MaximumNumberOfActiveOccluders of occluders, |
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| 73 | * discarding the occluders with the lowest shadow occluder volume. */ |
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| 74 | void removeOccludedOccluders(); |
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| 75 | |
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| 76 | |
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| 77 | protected: |
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| 78 | |
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| 79 | /** Prevents unwanted copy construction. */ |
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| 80 | //CollectOccludersVisitor(const CollectOccludersVisitor&):osg::NodeVisitor(),osg::CullStack() {} |
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| 81 | |
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| 82 | /** Prevents unwanted copy operator. */ |
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| 83 | CollectOccludersVisitor& operator = (const CollectOccludersVisitor&) { return *this; } |
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| 84 | |
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| 85 | inline void handle_cull_callbacks_and_traverse(osg::Node& node) |
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| 86 | { |
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| 87 | /*osg::NodeCallback* callback = node.getCullCallback(); |
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| 88 | if (callback) (*callback)(&node,this); |
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| 89 | else*/ if (node.getNumChildrenWithOccluderNodes()>0) traverse(node); |
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| 90 | } |
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| 91 | |
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| 92 | inline void handle_cull_callbacks_and_accept(osg::Node& node,osg::Node* acceptNode) |
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| 93 | { |
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| 94 | /*osg::NodeCallback* callback = node.getCullCallback(); |
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| 95 | if (callback) (*callback)(&node,this); |
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| 96 | else*/ if (node.getNumChildrenWithOccluderNodes()>0) acceptNode->accept(*this); |
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| 97 | } |
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| 98 | |
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| 99 | float _minimumShadowOccluderVolume; |
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| 100 | unsigned _maximumNumberOfActiveOccluders; |
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| 101 | bool _createDrawables; |
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| 102 | ShadowVolumeOccluderSet _occluderSet; |
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| 103 | |
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| 104 | }; |
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| 105 | |
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| 106 | } |
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| 107 | |
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| 108 | #endif |
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| 109 | |
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