335 lines
14 KiB
C++
335 lines
14 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library 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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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OSGDB_REGISTRY
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#define OSGDB_REGISTRY 1
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#include <osg/ref_ptr>
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#include <osg/ArgumentParser>
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#include <osgDB/DynamicLibrary>
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#include <osgDB/ReaderWriter>
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#include <osgDB/DotOsgWrapper>
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#include <vector>
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#include <map>
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#include <string>
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#include <deque>
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namespace osgDB {
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/** basic structure for custom runtime inheritance checking */
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struct basic_type_wrapper {
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virtual bool matches(const osg::Object *proto) const = 0;
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};
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/** a class template that checks inheritance between a given
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Object's class and a class defined at compile time through
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the template parameter T.
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This is used in conjunction with readObjectOfType() to
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specify an abstract class as reference type.
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**/
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template<class T>
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struct type_wrapper: basic_type_wrapper {
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bool matches(const osg::Object *proto) const
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{
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return dynamic_cast<const T*>(proto) != 0;
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}
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};
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/** list of directories to search through which searching for files. */
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typedef std::deque<std::string> FilePathList;
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/**
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Registry is a singleton factory which stores
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the reader/writers which are linked in
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at runtime for reading non-native file formats.
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The RegisterDotOsgWrapperProxy can be used to automatically register
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DotOsgWrappers, at runtime with the Registry. A DotOsgWrapper encapsulates
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the functions that can read and write to the .osg for each osg::Object.
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The RegisterReaderWriterProxy can be used to automatically
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register at runtime a reader/writer with the Registry.
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*/
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class OSGDB_EXPORT Registry : public osg::Referenced
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{
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public:
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static Registry* instance();
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/** read the command line arguments.*/
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void readCommandLine(osg::ArgumentParser& commandLine);
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/** register an .fileextension alias to mapExt toExt, the later
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* should the the extension name of the readerwriter plugin library.
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* For example to map .tif files to the tiff loader, use
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* addExtAlias("tif","tiff") which will enable .tif to be read
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* by the libdb_tiff readerwriter plugin.*/
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void addFileExtensionAlias(const std::string mapExt, const std::string toExt);
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void addDotOsgWrapper(DotOsgWrapper* wrapper);
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void removeDotOsgWrapper(DotOsgWrapper* wrapper);
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void addReaderWriter(ReaderWriter* rw);
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void removeReaderWriter(ReaderWriter* rw);
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/** create the platform specific library name associated with file.*/
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std::string createLibraryNameForFile(const std::string& fileName);
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/** create the platform specific library name associated with file extension.*/
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std::string createLibraryNameForExtension(const std::string& ext);
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/** create the platform specific library name associated with nodekit library name.*/
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std::string createLibraryNameForNodeKit(const std::string& name);
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/** find the library in the SG_LIBRARY_PATH and load it.*/
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bool loadLibrary(const std::string& fileName);
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/** close the attached library with specified name.*/
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bool closeLibrary(const std::string& fileName);
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/** get a reader writer which handles specified extension.*/
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ReaderWriter* getReaderWriterForExtension(const std::string& ext);
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osg::Object* readObjectOfType(const osg::Object& compObj,Input& fr);
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osg::Object* readObjectOfType(const basic_type_wrapper &btw, Input& fr);
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osg::Object* readObject(Input& fr);
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osg::Image* readImage(Input& fr);
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osg::Drawable* readDrawable(Input& fr);
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osg::StateAttribute* readStateAttribute(Input& fr);
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osg::Node* readNode(Input& fr);
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bool writeObject(const osg::Object& obj,Output& fw);
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ReaderWriter::ReadResult readObject(const std::string& fileName,bool useObjectCache);
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ReaderWriter::WriteResult writeObject(const osg::Object& obj, const std::string& fileName);
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ReaderWriter::ReadResult readImage(const std::string& fileName,bool useObjectCache);
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ReaderWriter::WriteResult writeImage(const osg::Image& obj, const std::string& fileName);
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ReaderWriter::ReadResult readHeightField(const std::string& fileName,bool useObjectCache);
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ReaderWriter::WriteResult writeHeightField(const osg::HeightField& obj, const std::string& fileName);
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ReaderWriter::ReadResult readNode(const std::string& fileName,bool useObjectCache);
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ReaderWriter::WriteResult writeNode(const osg::Node& node, const std::string& fileName);
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void setCreateNodeFromImage(bool flag) { _createNodeFromImage = flag; }
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bool getCreateNodeFromImage() const { return _createNodeFromImage; }
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void setOptions(ReaderWriter::Options* opt) { _options = opt; }
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ReaderWriter::Options* getOptions() { return _options.get(); }
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const ReaderWriter::Options* getOptions() const { return _options.get(); }
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/** initilize both the Data and Library FilePaths, by default called by the
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* constructor, so it should only be required if you want to force
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* the re-reading of environmental variables.*/
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void initFilePathLists() { initDataFilePathList(); initLibraryFilePathList(); }
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/** initilize the Data FilePath by reading the OSG_FILE_PATH environmental variable.*/
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void initDataFilePathList();
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/** Set the data file path using a list of paths stored in a FilePath, which is used when search for data files.*/
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void setDataFilePathList(const FilePathList& filepath) { _dataFilePath = filepath; }
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/** Set the data file path using a single string deliminated either with ';' (Windows) or ':' (All other platforms), which is used when search for data files.*/
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void setDataFilePathList(const std::string& paths) { _dataFilePath.clear(); convertStringPathIntoFilePathList(paths,_dataFilePath); }
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/** get the data file path which is used when search for data files.*/
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FilePathList& getDataFilePathList() { return _dataFilePath; }
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/** get the const data file path which is used when search for data files.*/
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const FilePathList& getDataFilePathList() const { return _dataFilePath; }
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/** initilize the Library FilePath by reading the OSG_LIBRARY_PATH
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* and the appropriate system environmental variables*/
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void initLibraryFilePathList();
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/** Set the library file path using a list of paths stored in a FilePath, which is used when search for data files.*/
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void setLibraryFilePathList(const FilePathList& filepath) { _libraryFilePath = filepath; }
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/** Set the library file path using a single string deliminated either with ';' (Windows) or ':' (All other platforms), which is used when search for data files.*/
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void setLibraryFilePathList(const std::string& paths) { _libraryFilePath.clear(); convertStringPathIntoFilePathList(paths,_libraryFilePath); }
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/** get the library file path which is used when search for library (dso/dll's) files.*/
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FilePathList& getLibraryFilePathList() { return _libraryFilePath; }
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/** get the const library file path which is used when search for library (dso/dll's) files.*/
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const FilePathList& getLibraryFilePathList() const { return _libraryFilePath; }
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/** convert a string containing a list of paths deliminated either with ';' (Windows) or ':' (All other platforms) into FilePath represetation.*/
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static void convertStringPathIntoFilePathList(const std::string& paths,FilePathList& filepath);
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/** For each object in the cache which has an reference count greater than 1
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* (and therefore referenced by elsewhere in the application) set the time stamp
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* for that object in the cache to specified time.
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* This would typically be called once per frame by applications which are doing database paging,
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* and need to prune objects that are no longer required.
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* Time value is time in sceonds.*/
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void updateTimeStampOfObjectsInCacheWithExtenalReferences(double currentTime);
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/** Removed object in the cache which have a time stamp at or before the specified expiry time.
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* This would typically be called once per frame by applications which are doing database paging,
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* and need to prune objects that are no longer required, and called after the a called
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* after the call to updateTimeStampOfObjectsInCacheWithExtenalReferences(currentTime).
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* Note, the currentTime is not the expiryTime, one would typically set the expiry time
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* to a fixed amount of time before currentTime, such as expiryTime = currentTime-10.0.
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* Time value is time in sceonds.*/
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void removeExpiredObjectsInCache(double expiryTime);
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/** Remove all objects in the cache regardless of having external references or expiry times.*/
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void clearObjectCache();
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/** Add a filename,object,timestamp tripple to the Registry::ObjectCache.*/
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void addEntryToObjectCache(const std::string& filename, osg::Object* object, double timestamp = 0.0);
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/** Set whether the Registry::ObjectCache should be used by default.*/
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void setUseObjectCacheHint(bool useObjectCache) { _useObjectCacheHint = useObjectCache; }
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/** Get whether the Registry::ObjectCache should be used by default.*/
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bool getUseObjectCacheHint() const { return _useObjectCacheHint; }
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/** get the attached library with specified name.*/
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DynamicLibrary* getLibrary(const std::string& fileName);
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protected:
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virtual ~Registry();
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typedef std::map< std::string, osg::ref_ptr<DotOsgWrapper> > DotOsgWrapperMap;
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typedef std::vector< osg::ref_ptr<ReaderWriter> > ReaderWriterList;
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typedef std::vector< osg::ref_ptr<DynamicLibrary> > DynamicLibraryList;
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typedef std::map< std::string, std::string> ExtensionAliasMap;
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typedef std::pair<osg::ref_ptr<osg::Object>, double > ObjectTimeStampPair;
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typedef std::map<std::string, ObjectTimeStampPair > ObjectCache;
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/** constructor is private, as its a singleton, preventing
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construction other than via the instance() method and
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therefore ensuring only one copy is ever constructed*/
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Registry();
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/** get the attached library with specified name.*/
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DynamicLibraryList::iterator getLibraryItr(const std::string& fileName);
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bool _createNodeFromImage;
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osg::Object* readObject(DotOsgWrapperMap& dowMap,Input& fr);
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void eraseWrapper(DotOsgWrapperMap& wrappermap,DotOsgWrapper* wrapper);
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ReaderWriter::ReadResult readObject(const std::string& fileName);
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ReaderWriter::ReadResult readImage(const std::string& fileName);
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ReaderWriter::ReadResult readHeightField(const std::string& fileName);
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ReaderWriter::ReadResult readNode(const std::string& fileName);
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DotOsgWrapperMap _objectWrapperMap;
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DotOsgWrapperMap _imageWrapperMap;
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DotOsgWrapperMap _drawableWrapperMap;
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DotOsgWrapperMap _stateAttrWrapperMap;
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DotOsgWrapperMap _nodeWrapperMap;
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DotOsgWrapperMap _classNameWrapperMap;
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ReaderWriterList _rwList;
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DynamicLibraryList _dlList;
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bool _openingLibrary;
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// map to alias to extensions to plugins.
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ExtensionAliasMap _extAliasMap;
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// options to pass to reader writers.
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osg::ref_ptr<ReaderWriter::Options> _options;
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FilePathList _dataFilePath;
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FilePathList _libraryFilePath;
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bool _useObjectCacheHint;
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ObjectCache _objectCache;
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};
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/** read the command line arguments.*/
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inline void readCommandLine(osg::ArgumentParser& parser)
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{
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Registry::instance()->readCommandLine(parser);
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}
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/** Proxy class for automatic registration of DotOsgWrappers with the Registry.*/
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class RegisterDotOsgWrapperProxy
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{
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public:
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RegisterDotOsgWrapperProxy(osg::Object* proto,
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const std::string& name,
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const std::string& associates,
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DotOsgWrapper::ReadFunc readFunc,
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DotOsgWrapper::WriteFunc writeFunc,
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DotOsgWrapper::ReadWriteMode readWriteMode=DotOsgWrapper::READ_AND_WRITE)
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{
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if (Registry::instance())
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{
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_wrapper = new DotOsgWrapper(proto,name,associates,readFunc,writeFunc,readWriteMode);
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Registry::instance()->addDotOsgWrapper(_wrapper.get());
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}
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}
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~RegisterDotOsgWrapperProxy()
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{
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if (Registry::instance())
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{
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Registry::instance()->removeDotOsgWrapper(_wrapper.get());
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}
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}
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protected:
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osg::ref_ptr<DotOsgWrapper> _wrapper;
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};
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/** Proxy class for automatic registration of reader/writers with the Registry.*/
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template<class T>
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class RegisterReaderWriterProxy
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{
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public:
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RegisterReaderWriterProxy()
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{
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if (Registry::instance())
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{
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_rw = new T;
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Registry::instance()->addReaderWriter(_rw.get());
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}
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}
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~RegisterReaderWriterProxy()
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{
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if (Registry::instance())
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{
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Registry::instance()->removeReaderWriter(_rw.get());
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}
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}
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T* get() { return _rw.get(); }
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protected:
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osg::ref_ptr<T> _rw;
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};
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}
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#endif
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