94 lines
3.1 KiB
C++
94 lines
3.1 KiB
C++
/* -*-c++-*- */
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/* osgEarth - Geospatial SDK for OpenSceneGraph
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* Copyright 2020 Pelican Mapping
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* http://osgearth.org
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*
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* osgEarth is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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#ifndef OSGEARTHSYMBOLOGY_MESH_FLATTENER
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#define OSGEARTHSYMBOLOGY_MESH_FLATTENER
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#include <osgEarth/Common>
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namespace osgEarth { namespace Util
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{
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/**
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* Prepares a scene graph for aggressive optimization. Removes things like names, user data, callbacks, etc.
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* Use carefully.
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*/
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struct OSGEARTH_EXPORT PrepareForOptimizationVisitor : public osg::NodeVisitor
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{
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PrepareForOptimizationVisitor();
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virtual void apply(osg::Node& node);
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};
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/**
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* Utility visitor to aid in flattening a scene graph. Collects a map of StateSet stacks to Geodes.
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* Assumes that all transforms have already been removed from the scene graph.
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*/
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struct OSGEARTH_EXPORT FlattenSceneGraphVisitor : public osg::NodeVisitor
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{
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FlattenSceneGraphVisitor();
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virtual void apply(osg::Node& node);
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virtual void apply(osg::Geode& geode);
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virtual void apply(osg::Geometry& geometry);
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void pushStateSet(osg::StateSet* stateSet);
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void popStateSet();
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/**
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* Build the flattened scene graph from the statesets and geodes.
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*/
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osg::Node* build();
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typedef std::vector< osg::ref_ptr< osg::StateSet > > StateSetStack;
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typedef std::vector< osg::ref_ptr< osg::Geometry > > GeometryVector;
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StateSetStack _ssStack;
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typedef std::map< StateSetStack, GeometryVector > StateSetStackToGeometryMap;
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StateSetStackToGeometryMap _geometries;
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bool _mergeGeometry;
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unsigned _maxVertsPerCluster;
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};
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/**
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* Flattens "flatten" the given scene graph, turning it into a
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* a very basic scene graph consisting of a group at the top with a list of geodes
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* each consisting of as small of a number of drawables as possible.
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*
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* Limitations:
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* This will only work on relatively simple scene graphs consisting of MatrixTransforms, Groups, Geodes, etc.
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* If your scene graph constains things likes AutoTransforms, LightPointNodes, Sequences, etc it will not preserve them.
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*/
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class OSGEARTH_EXPORT MeshFlattener
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{
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public:
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static void run( osg::Group* group );
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/** Run the flattener and indicate the target vertex count for the MergeGeometry stage. */
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static void run(osg::Group* group, unsigned maxVertsPerCluster);
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};
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} }
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#endif // OSGEARTHSYMBOLOGY_MESH_FLATTENER
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