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(→Enhanced load/save support: Reaplace <source> with <syntaxhighlight>) |
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'''Implemented by:''' | '''Implemented by:''' | ||
[[AGOS]], [[Draci]], [[Gob]], [[Kyra]], [[Lure]], [[Mohawk]], [[Mortevielle]], [[Parallaction]], [[Pegasus]], [[SAGA]], [[SCI]], [[SCUMM]], [[Sword2]], [[Toon]], [[ZVision]] | [[AGOS]], [[Draci]], [[Gob]], [[Kyra]], [[Lure]], [[Mohawk]], [[Mortevielle]], [[Parallaction]], [[Pegasus]], [[SAGA]], [[SCI]], [[SCUMM]], [[Supernova]], [[Sword2]], [[Toon]], [[ZVision]] | ||
'''Not implemented by:''' | '''Not implemented by:''' | ||
[[AGI]], [[Avalanche]], [[CGE]], [[Cine]], [[Composer]], [[CruisE]], [[Drascula]], [[Dreamweb | [[AGI]], [[Avalanche]], [[CGE]], [[Cine]], [[Composer]], [[CruisE]], [[Drascula]], [[Dreamweb]], [[Groovie]], [[Hopkins]], [[Hugo]], [[Lastexpress]], [[MADE]], [[Neverhood]], [[NGI]], [[Queen]], [[Sky]], [[Sword1]], [[Sword25]], [[Tinsel]], [[Toltecs]], [[Tony]], [[Touche]], [[TsAGE]], [[Tucker]], [[Wintermute]] | ||
'''Support not necessary:''' | '''Support not necessary:''' | ||
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'''How to implement it'''<br> | '''How to implement it'''<br> | ||
You can implement this by checking for and honoring the | You can implement this by checking for and honoring the EVENT_RETURN_TO_LAUNCHER event. A much easier way, which also gives you some other advantages (e.g. this also covers EVENT_QUIT), is to regularly poll the return value of Engine::shouldQuit(). If it returns true, you should break out from your main game loop and your Engine::run() method should return to the caller. | ||
'''Relevant Engine API''' | '''Relevant Engine API''' | ||
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bool shouldQuit() const; | bool shouldQuit() const; | ||
kSupportsReturnToLauncher feature flag | |||
</syntaxhighlight> | </syntaxhighlight> | ||
'''Implemented by:''' | '''Implemented by:''' | ||
[[AGI]], [[AGOS]], [[CGE]], [[Cine]], [[Composer]], [[CruisE]], [[Draci]], [[Drascula]], [[Gob]], [[Groovie]], [[Hopkins]], [[Hugo]], [[Kyra]], [[Lastexpress]], [[Lure]], [[MADE]], [[Mohawk]], [[Mortevielle]], [[Neverhood]], [[Parallaction]], [[Pegasus]], [[Queen]], [[SAGA]], [[SCI]], [[SCUMM]], [[Sky]], [[Sword1]], [[Sword2]], [[Sword25]], [[TeenAgent]], [[Toltecs]], [[Tony]], [[Toon]], [[Touche]], [[TsAGE]], [[Tucker]], [[Wintermute]], [[ZVision]] | [[AGI]], [[AGOS]], [[CGE]], [[Cine]], [[Composer]], [[CruisE]], [[Draci]], [[Drascula]], [[Dreamweb]], [[Gob]], [[Groovie]], [[Hopkins]], [[Hugo]], [[Kyra]], [[Lastexpress]], [[Lure]], [[MADE]], [[Mohawk]], [[Mortevielle]], [[Neverhood]], [[NGI]], [[Parallaction]], [[Pegasus]], [[Queen]], [[SAGA]], [[SCI]], [[SCUMM]], [[Sky]], [[Supernova]], [[Sword1]], [[Sword2]], [[Sword25]], [[TeenAgent]], [[Tinsel]], [[Toltecs]], [[Tony]], [[Toon]], [[Touche]], [[TsAGE]], [[Tucker]], [[Wintermute]], [[ZVision]] | ||
'''Not implemented by:''' [[Avalanche | '''Not implemented by:''' [[Avalanche]] | ||
===Global options dialog support=== | ===Global options dialog support=== | ||
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'''Not implemented by:''' | '''Not implemented by:''' | ||
[[Avalanche]], [[CGE]], [[Composer]], [[Drascula]], [[Dreamweb]], [[ | [[Avalanche]], [[CGE]], [[Composer]], [[Drascula]], [[Dreamweb]], [[Mohawk]], [[Neverhood]], [[NGI]], [[Parallaction]], [[Pegasus]], [[Sword25]], [[Tucker]], [[Wintermute]] | ||
'''Support not necessary:''' [[AGI]], [[Mortevielle]], [[TeenAgent]], [[Tinsel]], [[Toon]] | '''Support not necessary:''' [[AGI]], [[Mortevielle]], [[TeenAgent]], [[Tinsel]], [[Toon]] | ||
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In this section, we present various MetaEngine and Engine APIs which greatly experience | In this section, we present various MetaEngine and Engine APIs which greatly experience | ||
the user experience with regards to savestates. | the user experience with regards to savestates. These days, the bulk of logic for listing, loading, saving, or deleting savegames is provided by the Engine class. As engine writers you only need to override loadGameStream & saveGameStream to read and write data from savefiles. | ||
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With this feature, it is possible to build a list of available save slots for a given game target. This can be used by the user to list all saveslots from the command line, as the following example illustrates: | With this feature, it is possible to build a list of available save slots for a given game target. This can be used by the user to list all saveslots from the command line, as the following example illustrates: | ||
<syntaxhighlight lang="bash"> | <syntaxhighlight lang="bash"> | ||
$ ./scummvm --list-saves=monkey2 | $ ./scummvm --list-saves --game=monkey2 | ||
Saves for target 'monkey2': | Saves for target 'monkey2': | ||
Slot Description | Slot Description | ||
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'''How to implement it'''<br> | '''How to implement it'''<br> | ||
You | You probably don't. Newly created engines, which use loadGameStream & saveGameStream, automatically use the extended savegame format. With this, the Engine class already provides a default implementation of listSaves for you. However, if for some reason you want to override it, such as if you're providing your own custom savegame implementation from scratch, the method is passed a parameter indicating the target for which the list of savestates is requested. From this, you can (using the config manager) determine the path to the game data, if necessary, or just directly compute all available savestates. Details necessarily depend on your Engine, but looking at existing implementations should give you a fairly good idea how to tackle this. | ||
Another requirement is MetaEngine::getMaximumSaveSlot, which returns the maximum save slot number supported by your engine. This is for example used by the GUI to show up empty slots correctly. | Another requirement is MetaEngine::getMaximumSaveSlot, which returns the maximum save slot number supported by your engine. This is for example used by the GUI to show up empty slots correctly. | ||
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'''Implemented by:''' | '''Implemented by:''' | ||
[[AGI]], [[AGOS]], [[Avalanche]], [[CGE]], [[Cine]], [[CruisE]], [[Draci]], [[Drascula]], [[Dreamweb]], [[Groovie]], [[Hopkins]], [[Hugo]], [[Kyra]], [[Lure]], [[Mohawk]], [[Mortevielle]], [[Neverhood]], [[Parallaction]], [[Pegasus]], [[Queen]], [[SAGA]], [[SCI]], [[SCUMM]], [[Sky]], [[Sword1]], [[Sword2]], [[Sword25]], [[Tinsel]], [[Toltecs]], [[Tony]], [[Toon]], [[Touche]], [[Tucker]], [[Wintermute]], [[ZVision]] | [[AGI]], [[AGOS]], [[Avalanche]], [[CGE]], [[Cine]], [[CruisE]], [[Draci]], [[Drascula]], [[Dreamweb]], [[Groovie]], [[Hopkins]], [[Hugo]], [[Kyra]], [[Lure]], [[Mohawk]], [[Mortevielle]], [[Neverhood]], [[Parallaction]], [[Pegasus]], [[Queen]], [[SAGA]], [[SCI]], [[SCUMM]], [[Sky]], [[Supernova]], [[Sword1]], [[Sword2]], [[Sword25]], [[Tinsel]], [[Toltecs]], [[Tony]], [[Toon]], [[Touche]], [[Tucker]], [[Wintermute]], [[ZVision]] | ||
'''Not implemented by:''' | '''Not implemented by:''' | ||
[[Composer]], [[ | [[Composer]], [[Gob]], [[Lastexpress]], [[MADE]], [[NGI]], [[TeenAgent]], [[TsAGE]] | ||
===Loading savestates via command line or Launcher=== | ===Loading savestates via command line or Launcher=== | ||
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'''Implemented by:''' | '''Implemented by:''' | ||
[[AGI]], [[Avalanche]], [[Cine]], [[CGE]], [[CruisE]], [[Draci]], [[Drascula]], [[Dreamweb]], [[Groovie]], [[Hopkins]], [[Hugo]], [[Kyra]], [[Lure]], [[Mohawk]], [[Mortevielle]], [[Neverhood]], [[Pegasus]], [[Queen]], [[SAGA]], [[SCI]], [[SCUMM]], [[Sky]], [[Sword1]], [[Sword2]], [[TeenAgent]], [[Tinsel]], [[Toltecs]], [[Tony]], [[Toon]], [[Touche]], [[TsAGE]], [[Tucker]], [[Wintermute]], [[ZVision]] | [[AGI]], [[Avalanche]], [[Cine]], [[CGE]], [[CruisE]], [[Draci]], [[Drascula]], [[Dreamweb]], [[Groovie]], [[Hopkins]], [[Hugo]], [[Kyra]], [[Lure]], [[Mohawk]], [[Mortevielle]], [[Neverhood]], [[Pegasus]], [[Queen]], [[SAGA]], [[SCI]], [[SCUMM]], [[Sky]], [[Supernova]], [[Sword1]], [[Sword2]], [[TeenAgent]], [[Tinsel]], [[Toltecs]], [[Tony]], [[Toon]], [[Touche]], [[TsAGE]], [[Tucker]], [[Wintermute]], [[ZVision]] | ||
'''Not implemented by:''' | '''Not implemented by:''' | ||
[[AGOS]], [[Composer]], [[ | [[AGOS]], [[Composer]], [[Gob]], [[Lastexpress]], [[MADE]], [[NGI]], [[Parallaction]], [[Sword25]] | ||
===Deleting savestates via the Launcher and GMM=== | ===Deleting savestates via the Launcher and GMM=== | ||
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'''Implemented by:''' | '''Implemented by:''' | ||
[[AGI]], [[Avalanche]], [[Cine]], [[CGE]], [[CruisE]], [[Draci]], [[Drascula]], [[Dreamweb]], [[Groovie]], [[Hopkins]], [[Hugo]], [[Kyra]], [[Lure]], [[Mohawk]], [[Neverhood]], [[Parallaction]], [[Pegasus]], [[Queen]], [[SAGA]], [[SCI]], [[SCUMM]], [[Sky]], [[Sword1]], [[Sword2]], [[TeenAgent]], [[Tinsel]], [[Toltecs]], [[Tony]], [[Toon]], [[Touche]], [[TsAGE]], [[Tucker]], [[Wintermute]], [[ZVision]] | [[AGI]], [[Avalanche]], [[Cine]], [[CGE]], [[CruisE]], [[Draci]], [[Drascula]], [[Dreamweb]], [[Groovie]], [[Hopkins]], [[Hugo]], [[Kyra]], [[Lure]], [[Mohawk]], [[Neverhood]], [[Parallaction]], [[Pegasus]], [[Queen]], [[SAGA]], [[SCI]], [[SCUMM]], [[Sky]], [[Supernova]], [[Sword1]], [[Sword2]], [[TeenAgent]], [[Tinsel]], [[Toltecs]], [[Tony]], [[Toon]], [[Touche]], [[TsAGE]], [[Tucker]], [[Wintermute]], [[ZVision]] | ||
'''Not implemented by:''' | '''Not implemented by:''' | ||
[[AGOS]], [[Composer]], [[ | [[AGOS]], [[Composer]], [[Gob]], [[Lastexpress]], [[MADE]], [[Mortevielle]], [[NGI]], [[Sword25]] | ||
===Savestate metadata support=== | ===Savestate metadata support=== | ||
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'''Implemented by:''' | '''Implemented by:''' | ||
[[AGI]], [[Avalanche]], [[CGE]], [[CruisE]], [[Draci]], [[Drascula]], [[Dreamweb]], [[Groovie]], [[Hopkins]], [[Hugo]], [[Kyra]], [[Mortevielle]], [[Neverhood]], [[SAGA]], [[SCI]], [[SCUMM]], [[Sword1]], [[TeenAgent]], [[Toltecs]], [[Tony]], [[Toon]], [[TsAGE]], [[Tucker]], [[Wintermute]], [[ZVision]] | [[AGI]], [[Avalanche]], [[CGE]], [[CruisE]], [[Draci]], [[Drascula]], [[Dreamweb]], [[Groovie]], [[Hopkins]], [[Hugo]], [[Kyra]], [[Mortevielle]], [[Neverhood]], [[SAGA]], [[SCI]], [[SCUMM]], [[Supernova]], [[Sword1]], [[TeenAgent]], [[Toltecs]], [[Tony]], [[Toon]], [[TsAGE]], [[Tucker]], [[Wintermute]], [[ZVision]] | ||
'''Not implemented by:''' | '''Not implemented by:''' | ||
[[AGOS]], [[Cine]], [[Composer]], [[ | [[AGOS]], [[Cine]], [[Composer]], [[Gob]], [[Lastexpress]], [[Lure]], [[Mohawk]], [[MADE]], [[NGI]], [[Parallaction]], [[Pegasus]], [[Queen]], [[Sky]], [[Sword2]], [[Sword25]], [[Touche]], [[Tinsel]] | ||
===Loading/Saving during run time=== | ===Loading/Saving during run time=== | ||
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Next, for each of the two, you have to implement two Engine methods (so up to four). We focus on adding loading support here: For that, first implement Engine::canLoadGameStateCurrently(). This method should only return true if loading a savestate is possible right now. If this is always possible, just always return true. But if loading is not possible at some points, say while a cutscene is playing, make it return false at these times. | Next, for each of the two, you have to implement two Engine methods (so up to four). We focus on adding loading support here: For that, first implement Engine::canLoadGameStateCurrently(). This method should only return true if loading a savestate is possible right now. If this is always possible, just always return true. But if loading is not possible at some points, say while a cutscene is playing, make it return false at these times. | ||
Next, the Engine:: | Next, the Engine::loadGameStream() is used to load save file data. Previously, this was loadGameState, but engines using it had to manually open the save files, so it's now deprecated. The GMM will invoke this method with a valid stream from an opened save file, allowing the engine to read from it. If there is an immediate error, you can indicate so with its return value (for details, refer to the doxygen comments), in which case the GMM will show an appropriate error dialog. In | ||
'''Relevant Engine API''' | '''Relevant Engine API''' | ||
<syntaxhighlight lang="cpp"> | <syntaxhighlight lang="cpp"> | ||
virtual Common::Error | virtual Common::Error Engine::loadGameStream(Common::SeekableReadStream *stream); | ||
virtual bool canLoadGameStateCurrently(); | virtual bool canLoadGameStateCurrently(); | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
Saving games is similar. Engines can override saveGameStream (rather than the now deprecated saveGameState). In this case, it gets passed in a write stream to a save file opened for saving. Additionally, it also gets passed a flag for whether an autosave is being created vs a save done by the user. Some engines may want to show a message or other indication in the UI after a save is done, but which shouldn't be done for regular autosaves. | |||
<syntaxhighlight lang="cpp"> | <syntaxhighlight lang="cpp"> | ||
virtual Common::Error | virtual Common::Error Engine::saveGameStream(Common::WriteStream *stream, bool isAutosave); | ||
virtual bool canSaveGameStateCurrently(); | virtual bool canSaveGameStateCurrently(); | ||
kSupportsSavingDuringRuntime feature flag | kSupportsSavingDuringRuntime feature flag | ||
</syntaxhighlight> | </syntaxhighlight> | ||
==Misc== | ==Misc== | ||
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:'''Implemented by:''' [[SCUMM]] | :'''Implemented by:''' [[SCUMM]] | ||
:'''Not implemented by:''' [[AGI]], [[AGOS]], [[Avalanche]], [[Cine]], [[CGE]], [[Composer]], [[CruisE]], [[Draci]], [[Drascula]], [[Dreamweb | :'''Not implemented by:''' [[AGI]], [[AGOS]], [[Avalanche]], [[Cine]], [[CGE]], [[Composer]], [[CruisE]], [[Draci]], [[Drascula]], [[Dreamweb]], [[Gob]], [[Groovie]], [[Hopkins]], [[Hugo]], [[Kyra]], [[Lastexpress]], [[Lure]], [[MADE]], [[Mohawk]], [[Mortevielle]], [[Neverhood]], [[NGI]], [[Parallaction]], [[Pegasus]], [[Queen]], [[SAGA]], [[SCI]], [[Sky]], [[Sword1]], [[Sword2]], [[Sword25]], [[TeenAgent]], [[Tinsel]], [[Toltecs]], [[Tony]], [[Toon]], [[Touche]], [[TsAGE]], [[Tucker]], [[Wintermute]], [[ZVision]] | ||
<syntaxhighlight lang="cpp"> | <syntaxhighlight lang="cpp"> | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
:'''Implemented by:''' [[AGI]], [[AGOS]], [[Avalanche]], [[Cine]], [[CGE]], [[Composer]], [[CruisE]], [[Draci]], [[Drascula]], [[Dreamweb | :'''Implemented by:''' [[AGI]], [[AGOS]], [[Avalanche]], [[Cine]], [[CGE]], [[Composer]], [[CruisE]], [[Draci]], [[Drascula]], [[Dreamweb]], [[Gob]], [[Groovie]], [[Hopkins]], [[Hugo]], [[Kyra]], [[Lastexpress]], [[Lure]], [[MADE]], [[Mohawk]], [[Mortevielle]], [[Neverhood]], [[NGI]], [[Parallaction]], [[Pegasus]], [[Queen]], [[SAGA]], [[SCI]], [[SCUMM]], [[Sky]], [[Sword1]], [[Sword2]], [[Sword25]], [[TeenAgent]], [[Tinsel]], [[Toltecs]], [[Toon]], [[Tony]], [[Touche]], [[TsAGE]], [[Tucker]], [[Wintermute]], [[ZVision]] | ||
:'''Not implemented by:''' | :'''Not implemented by:''' |
edits