First steps at provide a .terrain file format to experiment with file
definitions of terrain subgraphs
This commit is contained in:
Robert Osfield
@@ -1,7 +1,7 @@
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#this file is automatically generated
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SET(TARGET_SRC osgterrain.cpp )
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SET(TARGET_SRC osgterrain.cpp ReaderWriterTerrain.cpp)
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SET(TARGET_ADDED_LIBRARIES osgTerrain )
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#### end var setup ###
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SETUP_EXAMPLE(osgterrain)
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245
examples/osgterrain/ReaderWriterTerrain.cpp
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245
examples/osgterrain/ReaderWriterTerrain.cpp
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#include <sstream>
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#include <osg/Image>
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#include <osg/Group>
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#include <osg/Notify>
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#include <osgDB/FileNameUtils>
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#include <osgDB/FileUtils>
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#include <osgDB/ReadFile>
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#include <osgDB/Registry>
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#include <osgDB/Input>
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#include <osgDB/Output>
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#include <osgTerrain/TerrainNode>
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#include <osgTerrain/GeometryTechnique>
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#include <osgTerrain/Layer>
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class ReaderWriterTerrain : public osgDB::ReaderWriter
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{
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public:
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ReaderWriterTerrain()
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{
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}
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virtual const char* className() const { return "Terrain Reader"; }
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virtual bool acceptsExtension(const std::string& extension) const
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{
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return osgDB::equalCaseInsensitive(extension,"terrain");
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}
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virtual osgDB::ReaderWriter::ReadResult readNode(const std::string& file, const osgDB::ReaderWriter::Options* opt) const
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{
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std::string ext = osgDB::getLowerCaseFileExtension(file);
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if (!acceptsExtension(ext)) return ReadResult::FILE_NOT_HANDLED;
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std::string fileName = osgDB::findDataFile( file, opt );
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if (fileName.empty()) return ReadResult::FILE_NOT_FOUND;
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// code for setting up the database path so that internally referenced file are searched for on relative paths.
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osg::ref_ptr<Options> local_opt = opt ? static_cast<Options*>(opt->clone(osg::CopyOp::SHALLOW_COPY)) : new Options;
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local_opt->setDatabasePath(osgDB::getFilePath(fileName));
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std::ifstream fin(fileName.c_str());
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if (fin)
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{
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return readNode(fin, local_opt.get());
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}
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return 0L;
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}
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virtual osgDB::ReaderWriter::ReadResult readNode(std::istream& fin, const Options* options) const;
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osg::Node* readTerrainNode(osgDB::Input& fr) const;
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osgTerrain::Layer* readLayer(osgDB::Input& fr) const;
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};
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osgDB::ReaderWriter::ReadResult ReaderWriterTerrain::readNode(std::istream& fin, const osgDB::ReaderWriter::Options* options) const
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{
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fin.imbue(std::locale::classic());
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osgDB::Input fr;
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fr.attach(&fin);
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fr.setOptions(options);
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osg::notify(osg::NOTICE)<<"Reading terrain"<<std::endl;
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osg::ref_ptr<osg::Group> group = new osg::Group;
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while(!fr.eof())
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{
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osg::notify(osg::NOTICE)<<"Read : "<<fr[0].getStr() << std::endl;
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bool itrAdvanced = false;
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if (fr.matchSequence("file %s"))
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{
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osg::Node* node = osgDB::readNodeFile(fr[1].getStr());
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if (node) group->addChild(node);
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fr += 2;
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itrAdvanced = true;
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}
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if (fr.matchSequence("TerrainNode {") || fr.matchSequence("Terrain {") )
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{
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osg::Node* node = readTerrainNode(fr);
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itrAdvanced = true;
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}
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if (!itrAdvanced) ++fr;
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}
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if (group->getNumChildren()>0) return group.release();
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else return 0;
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}
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osg::Node* ReaderWriterTerrain::readTerrainNode(osgDB::Input& fr) const
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{
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osg::ref_ptr<osgTerrain::TerrainNode> terrain = new osgTerrain::TerrainNode;
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int entry = fr[0].getNoNestedBrackets();
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fr += 2;
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while (!fr.eof() && fr[0].getNoNestedBrackets()>entry)
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{
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osg::notify(osg::NOTICE)<<"Terrain : "<<fr[0].getStr() << std::endl;
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bool itrAdvanced = false;
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if (fr.matchSequence("Name %s"))
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{
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terrain->setName(fr[1].getStr());
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fr += 2;
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itrAdvanced = true;
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}
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if (fr.matchSequence("ElevationLayer {"))
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{
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osgTerrain::Layer* layer = readLayer(fr);
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if (layer) terrain->setElevationLayer(layer);
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itrAdvanced = true;
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}
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if (fr.matchSequence("ColorLayer {") || fr.matchSequence("ColourLayer {") )
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{
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osgTerrain::Layer* layer = readLayer(fr);
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if (layer) terrain->setColorLayer(0, layer);
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itrAdvanced = true;
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}
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if (fr.matchSequence("ColorLayer %i {") || fr.matchSequence("ColourLayer %i {") )
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{
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unsigned int layerNum;
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fr[1].getUInt(layerNum);
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++fr;
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osgTerrain::Layer* layer = readLayer(fr);
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if (layer) terrain->setColorLayer(layerNum, layer);
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itrAdvanced = true;
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}
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if (!itrAdvanced)
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{
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++fr;
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}
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}
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return terrain.release();
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}
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osgTerrain::Layer* ReaderWriterTerrain::readLayer(osgDB::Input& fr) const
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{
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osg::ref_ptr<osgTerrain::Layer> layer;
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osg::ref_ptr<osgTerrain::Locator> locator;
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int entry = fr[0].getNoNestedBrackets();
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fr += 2;
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while (!fr.eof() && fr[0].getNoNestedBrackets()>entry)
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{
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osg::notify(osg::NOTICE)<<"Layer : "<<fr[0].getStr() << std::endl;
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bool itrAdvanced = false;
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if (fr.matchSequence("Image %s") || fr.matchSequence("image %s"))
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{
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osg::ref_ptr<osg::Image> image = osgDB::readImageFile(fr[1].getStr());
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if (image.valid())
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{
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osg::ref_ptr<osgTerrain::ImageLayer> imagelayer = new osgTerrain::ImageLayer;
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imagelayer->setImage(image.get());
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layer = imagelayer.get();
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}
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fr += 2;
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itrAdvanced = true;
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}
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if (fr.matchSequence("EllipsoidLocator %f %f %f %f"))
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{
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double x,y,w,h;
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fr[1].getFloat(x);
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fr[2].getFloat(y);
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fr[3].getFloat(w);
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fr[4].getFloat(h);
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locator = new osgTerrain::EllipsoidLocator(x,y,w,h,0);
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fr += 5;
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itrAdvanced = true;
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}
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if (fr.matchSequence("CartesianLocator %f %f %f %f"))
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{
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double x,y,w,h;
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fr[1].getFloat(x);
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fr[2].getFloat(y);
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fr[3].getFloat(w);
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fr[4].getFloat(h);
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locator = new osgTerrain::CartesianLocator(x,y,w,h,0);
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fr += 5;
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itrAdvanced = true;
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}
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if (!itrAdvanced)
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{
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++fr;
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}
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}
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if (layer.valid() && locator.valid())
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{
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layer->setLocator(locator.get());
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}
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return layer.release();
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}
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// now register with Registry to instantiate the above
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// reader/writer.
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REGISTER_OSGPLUGIN(terrain, ReaderWriterTerrain)
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@@ -48,9 +48,10 @@
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#include <iostream>
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class FilterHandler : public osgGA::GUIEventHandler
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{
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public:
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public:
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FilterHandler(osgTerrain::GeometryTechnique* gt):
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_gt(gt) {}
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@@ -114,8 +115,8 @@ public:
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}
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protected:
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protected:
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osg::observer_ptr<osgTerrain::GeometryTechnique> _gt;
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};
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@@ -124,7 +125,7 @@ protected:
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class LayerHandler : public osgGA::GUIEventHandler
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{
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public:
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public:
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LayerHandler(osgTerrain::Layer* layer):
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_layer(layer) {}
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@@ -158,7 +159,7 @@ public:
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}
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protected:
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protected:
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osg::observer_ptr<osgTerrain::Layer> _layer;
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@@ -214,6 +215,23 @@ int main(int argc, char** argv)
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double y = 0.0;
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double w = 1.0;
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double h = 1.0;
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osg::ref_ptr<osg::Node> test = osgDB::readNodeFile("test.terrain");
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if (!test.valid()) return 0;
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viewer.setSceneData(test.get());
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viewer.realize();
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while (!viewer.done())
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{
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viewer.advance();
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viewer.eventTraversal();
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viewer.updateTraversal();
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viewer.frame();
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}
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return 0;
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osg::ref_ptr<osgTerrain::TerrainNode> terrain = new osgTerrain::TerrainNode;
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osg::ref_ptr<osgTerrain::Locator> locator = new osgTerrain::EllipsoidLocator(-osg::PI, -osg::PI*0.5, 2.0*osg::PI, osg::PI, 0.0);
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