295 lines
16 KiB
C++
295 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/Image>
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#include <osg/Shape>
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#include <osg/Node>
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#include <osg/ScriptEngine>
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#include <osgDB/AuthenticationMap>
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#include <deque>
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#include <list>
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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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// forward declare
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class Options;
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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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typedef std::map<std::string, std::string> FormatDescriptionMap;
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typedef std::list<std::string> FeatureList;
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/** Return which protocols are supported by ReaderWriter. */
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virtual const FormatDescriptionMap& supportedProtocols() const { return _supportedProtocols; }
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/** Return which list of file extensions supported by ReaderWriter. */
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virtual const FormatDescriptionMap& supportedExtensions() const { return _supportedExtensions; }
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/** Return which list of file extensions supported by ReaderWriter. */
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virtual const FormatDescriptionMap& supportedOptions() const { return _supportedOptions; }
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/** Return true if ReaderWriter accepts specified file extension.*/
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virtual bool acceptsExtension(const std::string& /*extension*/) const;
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virtual bool acceptsProtocol(const std::string& protocol) const;
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/// Bit mask for setting up which feature types are available for read and/or write
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enum Features
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{
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FEATURE_NONE = 0,
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FEATURE_READ_OBJECT = 1<<0,
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FEATURE_READ_IMAGE = 1<<1,
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FEATURE_READ_HEIGHT_FIELD = 1<<2,
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FEATURE_READ_NODE = 1<<3,
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FEATURE_READ_SHADER = 1<<4,
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FEATURE_WRITE_OBJECT = 1<<5,
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FEATURE_WRITE_IMAGE = 1<<6,
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FEATURE_WRITE_HEIGHT_FIELD = 1<<7,
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FEATURE_WRITE_NODE = 1<<8,
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FEATURE_WRITE_SHADER = 1<<9,
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FEATURE_READ_SCRIPT = 1<<10,
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FEATURE_WRITE_SCRIPT = 1<<11,
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FEATURE_ALL = FEATURE_READ_OBJECT |
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FEATURE_READ_IMAGE |
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FEATURE_READ_HEIGHT_FIELD |
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FEATURE_READ_NODE |
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FEATURE_READ_SHADER |
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FEATURE_READ_SCRIPT |
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FEATURE_WRITE_OBJECT |
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FEATURE_WRITE_IMAGE |
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FEATURE_WRITE_HEIGHT_FIELD |
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FEATURE_WRITE_NODE |
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FEATURE_WRITE_SHADER |
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FEATURE_WRITE_SCRIPT
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};
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/** Return available features*/
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virtual Features supportedFeatures() const;
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/** Return feature as string */
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static FeatureList featureAsString(Features feature);
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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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NOT_IMPLEMENTED, //!< read*() method not implemented in concrete ReaderWriter.
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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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ERROR_IN_READING_FILE, //!< File found, loaded, but an error was encountered during processing.
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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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FILE_REQUESTED, //!< Asynchronous file read has been requested, but returning immediately, keep polling plugin until file read has been completed.
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INSUFFICIENT_MEMORY_TO_LOAD //!< File found but not loaded because estimated required memory surpasses available memory.
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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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template<class T>
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ReadResult(const osg::ref_ptr<T>& obj, ReadStatus status=FILE_LOADED):_status(status),_object(obj.get()) {}
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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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bool operator < (const ReadResult& rhs) const { return _status < rhs._status; }
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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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osg::Script* getScript();
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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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bool validScript() { return getScript()!=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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osg::Script* takeScript();
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std::string& message() { return _message; }
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const std::string& message() const { return _message; }
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/// report the ReadResult's status, and message (if any). Useful for reporting of errors to users.
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std::string statusMessage() const;
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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 || _status==NOT_IMPLEMENTED; }
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bool notFound() const { return _status==FILE_NOT_FOUND; }
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bool notEnoughMemory() const { return _status==INSUFFICIENT_MEMORY_TO_LOAD; }
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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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NOT_IMPLEMENTED, //!< write*() method not implemented in concrete ReaderWriter.
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FILE_NOT_HANDLED,
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ERROR_IN_WRITING_FILE,
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FILE_SAVED
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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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bool operator < (const WriteResult& rhs) const { return _status < rhs._status; }
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std::string& message() { return _message; }
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const std::string& message() const { return _message; }
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/// Report the WriteResult's status, and message (if any). Useful for reporting of errors to users.
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std::string statusMessage() const;
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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 || _status==NOT_IMPLEMENTED; }
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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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typedef osgDB::Options Options;
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/** Determine if a file exists, normally the default implementation will be appropriate for local file access
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* but with plugins like the libcurl based one it will return true if the file is accessible at the server. */
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virtual bool fileExists(const std::string& filename, const Options* options) const;
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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::NOT_IMPLEMENTED); }
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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::NOT_IMPLEMENTED); }
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virtual ReadResult readObject(const std::string& /*fileName*/,const Options* =NULL) const { return ReadResult(ReadResult::NOT_IMPLEMENTED); }
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virtual ReadResult readImage(const std::string& /*fileName*/,const Options* =NULL) const { return ReadResult(ReadResult::NOT_IMPLEMENTED); }
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virtual ReadResult readHeightField(const std::string& /*fileName*/,const Options* =NULL) const { return ReadResult(ReadResult::NOT_IMPLEMENTED); }
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virtual ReadResult readNode(const std::string& /*fileName*/,const Options* =NULL) const { return ReadResult(ReadResult::NOT_IMPLEMENTED); }
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virtual ReadResult readShader(const std::string& /*fileName*/,const Options* =NULL) const { return ReadResult(ReadResult::NOT_IMPLEMENTED); }
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virtual ReadResult readScript(const std::string& /*fileName*/,const Options* =NULL) const { return ReadResult(ReadResult::NOT_IMPLEMENTED); }
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virtual WriteResult writeObject(const osg::Object& /*obj*/,const std::string& /*fileName*/,const Options* =NULL) const {return WriteResult(WriteResult::NOT_IMPLEMENTED); }
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virtual WriteResult writeImage(const osg::Image& /*image*/,const std::string& /*fileName*/,const Options* =NULL) const {return WriteResult(WriteResult::NOT_IMPLEMENTED); }
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virtual WriteResult writeHeightField(const osg::HeightField& /*heightField*/,const std::string& /*fileName*/,const Options* =NULL) const {return WriteResult(WriteResult::NOT_IMPLEMENTED); }
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virtual WriteResult writeNode(const osg::Node& /*node*/,const std::string& /*fileName*/,const Options* =NULL) const { return WriteResult(WriteResult::NOT_IMPLEMENTED); }
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virtual WriteResult writeShader(const osg::Shader& /*shader*/,const std::string& /*fileName*/,const Options* =NULL) const {return WriteResult(WriteResult::NOT_IMPLEMENTED); }
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virtual WriteResult writeScript(const osg::Script& /*script*/,const std::string& /*fileName*/,const Options* =NULL) const {return WriteResult(WriteResult::NOT_IMPLEMENTED); }
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virtual ReadResult readObject(std::istream& /*fin*/,const Options* =NULL) const { return ReadResult(ReadResult::NOT_IMPLEMENTED); }
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virtual ReadResult readImage(std::istream& /*fin*/,const Options* =NULL) const { return ReadResult(ReadResult::NOT_IMPLEMENTED); }
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virtual ReadResult readHeightField(std::istream& /*fin*/,const Options* =NULL) const { return ReadResult(ReadResult::NOT_IMPLEMENTED); }
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virtual ReadResult readNode(std::istream& /*fin*/,const Options* =NULL) const { return ReadResult(ReadResult::NOT_IMPLEMENTED); }
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virtual ReadResult readShader(std::istream& /*fin*/,const Options* =NULL) const { return ReadResult(ReadResult::NOT_IMPLEMENTED); }
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virtual ReadResult readScript(std::istream& /*fin*/,const Options* =NULL) const { return ReadResult(ReadResult::NOT_IMPLEMENTED); }
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virtual WriteResult writeObject(const osg::Object& /*obj*/,std::ostream& /*fout*/,const Options* =NULL) const { return WriteResult(WriteResult::NOT_IMPLEMENTED); }
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virtual WriteResult writeImage(const osg::Image& /*image*/,std::ostream& /*fout*/,const Options* =NULL) const { return WriteResult(WriteResult::NOT_IMPLEMENTED); }
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virtual WriteResult writeHeightField(const osg::HeightField& /*heightField*/,std::ostream& /*fout*/,const Options* =NULL) const { return WriteResult(WriteResult::NOT_IMPLEMENTED); }
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virtual WriteResult writeNode(const osg::Node& /*node*/,std::ostream& /*fout*/,const Options* =NULL) const { return WriteResult(WriteResult::NOT_IMPLEMENTED); }
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virtual WriteResult writeShader(const osg::Shader& /*shader*/,std::ostream& /*fout*/,const Options* =NULL) const { return WriteResult(WriteResult::NOT_IMPLEMENTED); }
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virtual WriteResult writeScript(const osg::Script& /*script*/,std::ostream& /*fout*/,const Options* =NULL) const { return WriteResult(WriteResult::NOT_IMPLEMENTED); }
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/** Specify fmt string as a supported protocol.
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* Please note, this method should usually only be used internally by subclasses of ReaderWriter, Only in special cases
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* will a ReaderWriter implementation be able to handle a protocol format that it wasn't originally designed for.
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* To know whether it's safe to inject a new protocol format into an existing ReaderWriter you will need to review
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* the source code and dependencies of that ReaderWriter. */
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void supportsProtocol(const std::string& fmt, const std::string& description);
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/** Specify ext string as a supported file extension.
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* Please note, this method should usually only be used internally by subclasses of ReaderWriter. Only in special cases
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* will a ReaderWriter implementation be able to handle a file extension that it wasn't originally designed for.
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* To know whether it's safe to inject a new file extension into an existing ReaderWriter you will need to review the
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* the source code and dependencies of that ReaderWriter. */
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void supportsExtension(const std::string& ext, const std::string& description);
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/** Specify option string as a supported option string.
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* Please note, this should usually only be used internally by subclasses of ReaderWriter. */
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void supportsOption(const std::string& opt, const std::string& description);
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protected:
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FormatDescriptionMap _supportedProtocols;
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FormatDescriptionMap _supportedExtensions;
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FormatDescriptionMap _supportedOptions;
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};
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}
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#endif // OSGDB_READERWRITER
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