646fc43747
ReaderWriter::ReadResult now has a FILE_REQUEST enum. ReaderWriter::Options now has a s/getAsynchronousFileReadHint() parameter methods. libcurl based plugin now detects enabing of the AsynchronousFileReadHint, but as yet does not handle async requests - handling everything syncronously. DatabasePager now by default will enable AsynchronousFileReadHint for http based file requests
311 lines
16 KiB
C++
311 lines
16 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 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_READERWRITER
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#define OSGDB_READERWRITER 1
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#include <osg/Referenced>
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#include <osg/Image>
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#include <osg/Shape>
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#include <osg/Node>
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#include <osgDB/Export>
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#include <deque>
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#include <iosfwd>
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namespace osgDB {
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class Archive;
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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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/** pure virtual base class for reading and writing of non native formats. */
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class OSGDB_EXPORT ReaderWriter : public osg::Object
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{
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public:
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ReaderWriter():
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osg::Object(true) {}
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ReaderWriter(const ReaderWriter& rw,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY):
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osg::Object(rw,copyop) {}
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virtual ~ReaderWriter();
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META_Object(osgDB,ReaderWriter);
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virtual bool acceptsExtension(const std::string& /*extension*/) const { return false; }
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/** Options base class used for passing options into plugins to control their operation.*/
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class Options : public osg::Object
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{
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public:
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/// bit mask for setting up which object types get cached by readObject/Image/HeightField/Node(filename) calls
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enum CacheHintOptions
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{ /// do not cache objects of any type
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CACHE_NONE = 0,
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/// cache nodes loaded via readNode(filename)
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CACHE_NODES = 1<<0,
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/// cache images loaded via readImage(filename)
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CACHE_IMAGES = 1<<1,
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/// cache heightfield loaded via readHeightField(filename)
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CACHE_HEIGHTFIELDS = 1<<2,
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/// cache heightfield loaded via readHeightField(filename)
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CACHE_ARCHIVES = 1<<3,
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/// cache objects loaded via readObject(filename)
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CACHE_OBJECTS = 1<<4,
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/// cache shaders loaded via readShader(filename)
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CACHE_SHADERS = 1<<5,
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/// cache on all read*(filename) calls
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CACHE_ALL = CACHE_NODES |
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CACHE_IMAGES |
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CACHE_HEIGHTFIELDS |
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CACHE_ARCHIVES |
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CACHE_OBJECTS |
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CACHE_SHADERS
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};
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Options():
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osg::Object(true),
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_objectCacheHint(CACHE_ARCHIVES),
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_asynchronousFileReadHint(false) {}
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Options(const std::string& str):
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osg::Object(true),
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_str(str),
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_objectCacheHint(CACHE_ARCHIVES),
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_asynchronousFileReadHint(false) {}
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Options(const Options& options,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY):
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osg::Object(options,copyop),
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_str(options._str),
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_databasePaths(options._databasePaths),
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_objectCacheHint(options._objectCacheHint),
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_asynchronousFileReadHint(options._asynchronousFileReadHint) {}
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META_Object(osgDB,Options);
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/** Set the general Options string.*/
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void setOptionString(const std::string& str) { _str = str; }
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/** Get the general Options string.*/
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const std::string& getOptionString() const { return _str; }
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/** Set the database path to use a hint of where to look when loading models.*/
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void setDatabasePath(const std::string& str) { _databasePaths.clear(); _databasePaths.push_back(str); }
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/** Get the database path which is used a hint of where to look when loading models.*/
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FilePathList& getDatabasePathList() { return _databasePaths; }
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/** Get the const database path which is used a hint of where to look when loading models.*/
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const FilePathList& getDatabasePathList() const { return _databasePaths; }
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/** Set whether the Registry::ObjectCache should be used by default.*/
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void setObjectCacheHint(CacheHintOptions useObjectCache) { _objectCacheHint = useObjectCache; }
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/** Get whether the Registry::ObjectCache should be used by default.*/
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CacheHintOptions getObjectCacheHint() const { return _objectCacheHint; }
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/** Set Asynchrnous file read hint.
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* This hint is used by plugins like the libcurl http reader plugin to inform them that
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* they should make an internal file read requests to their background threads to load files,
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* with the plugin returning immediately with a ReadResult::FILE_REQUESTED status. It is
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* assumed that calls will continue to be made to the plugin until the background threads
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* have read or failed to read the request file, at which point the return status which change
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* to FILE_LOADED and the objects will be returned.
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* Note, this facility is particular useful when using DatabasePager in conjunction with
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* internet based databases where file load latency is relatively high.*/
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void setAsynchronousFileReadHint(bool flag) { _asynchronousFileReadHint = flag; }
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/** Get Asynchrnous file read hint. */
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bool getAsynchronousFileReadHint() const { return _asynchronousFileReadHint; }
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/** Sets a plugindata value PluginData with a string */
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void setPluginData(const std::string& s, void* v) const { _pluginData[s] = v; }
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/** Get a value from the PluginData */
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void* getPluginData(const std::string& s) { return _pluginData[s]; }
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/** Get a value from the PluginData */
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const void* getPluginData(const std::string& s) const
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{
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PluginDataMap::const_iterator itr = _pluginData.find(s);
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return (itr == _pluginData.end()) ? 0 : itr->second;
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}
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/** Remove a value from the PluginData */
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void removePluginData(const std::string& s) const { _pluginData.erase(s); }
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protected:
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virtual ~Options() {}
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std::string _str;
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FilePathList _databasePaths;
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CacheHintOptions _objectCacheHint;
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bool _asynchronousFileReadHint;
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typedef std::map<std::string,void*> PluginDataMap;
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mutable PluginDataMap _pluginData;
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};
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class OSGDB_EXPORT ReadResult
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{
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public:
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enum ReadStatus
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{
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FILE_NOT_HANDLED, //!< File is not appropriate for this file reader, due to some incompatibility, but *not* a read error.
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FILE_NOT_FOUND, //!< File could not be found or could not be read.
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FILE_LOADED, //!< File successfully found, loaded, and converted into osg.
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FILE_LOADED_FROM_CACHE, //!< File found in cache and returned.
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ERROR_IN_READING_FILE, //!< File found, loaded, but an error was encountered during processing.
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FILE_REQUESTED, //!< Asyncronous file read has been requested, but returning immediatiely, keep polling plugin till file read has been completed.
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};
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ReadResult(ReadStatus status=FILE_NOT_HANDLED):_status(status) {}
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ReadResult(const std::string& m):_status(ERROR_IN_READING_FILE),_message(m) {}
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ReadResult(osg::Object* obj, ReadStatus status=FILE_LOADED):_status(status),_object(obj) {}
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ReadResult(const ReadResult& rr):_status(rr._status),_message(rr._message),_object(rr._object) {}
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ReadResult& operator = (const ReadResult& rr) { if (this==&rr) return *this; _status=rr._status; _message=rr._message;_object=rr._object; return *this; }
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osg::Object* getObject();
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osg::Image* getImage();
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osg::HeightField* getHeightField();
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osg::Node* getNode();
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osgDB::Archive* getArchive();
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osg::Shader* getShader();
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bool validObject() { return _object.valid(); }
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bool validImage() { return getImage()!=0; }
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bool validHeightField() { return getHeightField()!=0; }
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bool validNode() { return getNode()!=0; }
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bool validArchive() { return getArchive()!=0; }
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bool validShader() { return getShader()!=0; }
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osg::Object* takeObject();
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osg::Image* takeImage();
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osg::HeightField* takeHeightField();
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osg::Node* takeNode();
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osgDB::Archive* takeArchive();
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osg::Shader* takeShader();
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std::string& message() { return _message; }
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const std::string& message() const { return _message; }
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ReadStatus status() const { return _status; }
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bool success() const { return _status==FILE_LOADED || _status==FILE_LOADED_FROM_CACHE ; }
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bool loadedFromCache() const { return _status==FILE_LOADED_FROM_CACHE; }
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bool error() const { return _status==ERROR_IN_READING_FILE; }
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bool notHandled() const { return _status==FILE_NOT_HANDLED; }
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bool notFound() const { return _status==FILE_NOT_FOUND; }
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protected:
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ReadStatus _status;
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std::string _message;
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osg::ref_ptr<osg::Object> _object;
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};
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class WriteResult
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{
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public:
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enum WriteStatus
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{
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FILE_NOT_HANDLED,
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FILE_SAVED,
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ERROR_IN_WRITING_FILE
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};
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WriteResult(WriteStatus status=FILE_NOT_HANDLED):_status(status) {}
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WriteResult(const std::string& m):_status(ERROR_IN_WRITING_FILE),_message(m) {}
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WriteResult(const WriteResult& rr):_status(rr._status),_message(rr._message) {}
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WriteResult& operator = (const WriteResult& rr) { if (this==&rr) return *this; _status=rr._status; _message=rr._message; return *this; }
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std::string& message() { return _message; }
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const std::string& message() const { return _message; }
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WriteStatus status() const { return _status; }
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bool success() const { return _status==FILE_SAVED; }
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bool error() const { return _status==ERROR_IN_WRITING_FILE; }
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bool notHandled() const { return _status==FILE_NOT_HANDLED; }
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protected:
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WriteStatus _status;
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std::string _message;
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};
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enum ArchiveStatus
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{
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READ,
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WRITE,
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CREATE
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};
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/** open an archive for reading, writing, or to create an empty archive for writing to.*/
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virtual ReadResult openArchive(const std::string& /*fileName*/,ArchiveStatus, unsigned int =4096, const Options* =NULL) const { return ReadResult(ReadResult::FILE_NOT_HANDLED); }
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/** open an archive for reading.*/
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virtual ReadResult openArchive(std::istream& /*fin*/,const Options* =NULL) const { return ReadResult(ReadResult::FILE_NOT_HANDLED); }
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virtual ReadResult readObject(const std::string& /*fileName*/,const Options* =NULL) const { return ReadResult(ReadResult::FILE_NOT_HANDLED); }
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virtual ReadResult readImage(const std::string& /*fileName*/,const Options* =NULL) const { return ReadResult(ReadResult::FILE_NOT_HANDLED); }
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virtual ReadResult readHeightField(const std::string& /*fileName*/,const Options* =NULL) const { return ReadResult(ReadResult::FILE_NOT_HANDLED); }
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virtual ReadResult readNode(const std::string& /*fileName*/,const Options* =NULL) const { return ReadResult(ReadResult::FILE_NOT_HANDLED); }
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virtual ReadResult readShader(const std::string& /*fileName*/,const Options* =NULL) const { return ReadResult(ReadResult::FILE_NOT_HANDLED); }
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virtual WriteResult writeObject(const osg::Object& /*obj*/,const std::string& /*fileName*/,const Options* =NULL) const {return WriteResult(WriteResult::FILE_NOT_HANDLED); }
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virtual WriteResult writeImage(const osg::Image& /*image*/,const std::string& /*fileName*/,const Options* =NULL) const {return WriteResult(WriteResult::FILE_NOT_HANDLED); }
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virtual WriteResult writeHeightField(const osg::HeightField& /*heightField*/,const std::string& /*fileName*/,const Options* =NULL) const {return WriteResult(WriteResult::FILE_NOT_HANDLED); }
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virtual WriteResult writeNode(const osg::Node& /*node*/,const std::string& /*fileName*/,const Options* =NULL) const { return WriteResult(WriteResult::FILE_NOT_HANDLED); }
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virtual WriteResult writeShader(const osg::Shader& /*shader*/,const std::string& /*fileName*/,const Options* =NULL) const {return WriteResult(WriteResult::FILE_NOT_HANDLED); }
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virtual ReadResult readObject(std::istream& /*fin*/,const Options* =NULL) const { return ReadResult(ReadResult::FILE_NOT_HANDLED); }
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virtual ReadResult readImage(std::istream& /*fin*/,const Options* =NULL) const { return ReadResult(ReadResult::FILE_NOT_HANDLED); }
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virtual ReadResult readHeightField(std::istream& /*fin*/,const Options* =NULL) const { return ReadResult(ReadResult::FILE_NOT_HANDLED); }
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virtual ReadResult readNode(std::istream& /*fin*/,const Options* =NULL) const { return ReadResult(ReadResult::FILE_NOT_HANDLED); }
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virtual ReadResult readShader(std::istream& /*fin*/,const Options* =NULL) const { return ReadResult(ReadResult::FILE_NOT_HANDLED); }
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virtual WriteResult writeObject(const osg::Object& /*obj*/,std::ostream& /*fout*/,const Options* =NULL) const { return WriteResult(WriteResult::FILE_NOT_HANDLED); }
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virtual WriteResult writeImage(const osg::Image& /*image*/,std::ostream& /*fout*/,const Options* =NULL) const { return WriteResult(WriteResult::FILE_NOT_HANDLED); }
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virtual WriteResult writeHeightField(const osg::HeightField& /*heightField*/,std::ostream& /*fout*/,const Options* =NULL) const { return WriteResult(WriteResult::FILE_NOT_HANDLED); }
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virtual WriteResult writeNode(const osg::Node& /*node*/,std::ostream& /*fout*/,const Options* =NULL) const { return WriteResult(WriteResult::FILE_NOT_HANDLED); }
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virtual WriteResult writeShader(const osg::Shader& /*shader*/,std::ostream& /*fout*/,const Options* =NULL) const { return WriteResult(WriteResult::FILE_NOT_HANDLED); }
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};
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}
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#endif // OSGDB_READERWRITER
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