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Difference between revisions of "HOWTO-Engines"
Added info on ExtendedSaves
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=== True RGB color support === | === True RGB color support === | ||
If you need to support more than 256 colors in your game engine, please refer to [[API-Truecolor|the truecolor API reference page]] for specifications and initialization protocol. | If you need to support more than 256 colors in your game engine, please refer to [[API-Truecolor|the truecolor API reference page]] for specifications and initialization protocol. | ||
== Extended Saves == | |||
To easily support ScummVM-specific metadata in the saves, we implemented the ExtendedSaves interface. | |||
This basically makes your saves look like this: | |||
<DATA> Engine-specific save data | |||
<METAINFO> ScummVM metainfo, including play time, screenshot, save name etc | |||
<OFFSET> 4-bytes offset to the the ScummVM metainfo from the end of the save | |||
Thus, all generic methods like listSaves() are retrieving this information. | |||
In order to benefit from it, do the following: | |||
# In MetaEngine::hasFeature(), add kSavesUseExtendedFormat | |||
# Overload loadGameStream() and saveGameStream() where you parse/save only your engine-specific data | |||
# ... | |||
# PROFIT! | |||