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Feature: framework to make savegames self-descriptive

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We won't be able to make it fully self-descriptive (looking at you
MAP-chunks), but anything else can. With this framework, we can
add headers for each chunk explaining how each chunk looks like
in detail.

They also will all be tables, making it a lot easier to read in
external tooling, and opening the way to consider a database
(like SQLite) to use as savegame format.

Lastly, with the headers in the savegame, you can freely add
fields without needing a savegame version bump; older versions
of OpenTTD will simply ignore the new field. This also means
we can remove all the SLE_CONDNULL, as they are irrelevant.

The next few commits will start using this framework.
This commit is contained in:
Patric Stout
2021-06-14 10:05:30 +02:00
committed by Patric Stout
parent 513641f9ba
commit 7dd5fd6ed4
20 changed files with 620 additions and 188 deletions
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14
src/saveload/game_sl.cpp
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@@ -26,10 +26,10 @@ static std::string _game_saveload_settings;
static bool _game_saveload_is_random;
static const SaveLoad _game_script[] = {
SLEG_SSTR(_game_saveload_name, SLE_STR),
SLEG_SSTR(_game_saveload_settings, SLE_STR),
SLEG_VAR(_game_saveload_version, SLE_UINT32),
SLEG_VAR(_game_saveload_is_random, SLE_BOOL),
SLEG_SSTR("name", _game_saveload_name, SLE_STR),
SLEG_SSTR("settings", _game_saveload_settings, SLE_STR),
SLEG_VAR("version", _game_saveload_version, SLE_UINT32),
SLEG_VAR("is_random", _game_saveload_is_random, SLE_BOOL),
};
static void SaveReal_GSDT(int *index_ptr)
@@ -116,7 +116,7 @@ static uint32 _game_saveload_strings;
class SlGameLanguageString : public DefaultSaveLoadHandler<SlGameLanguageString, LanguageStrings> {
public:
inline static const SaveLoad description[] = {
SLEG_SSTR(_game_saveload_string, SLE_STR | SLF_ALLOW_CONTROL),
SLEG_SSTR("string", _game_saveload_string, SLE_STR | SLF_ALLOW_CONTROL),
};
void Save(LanguageStrings *ls) const override
@@ -142,8 +142,8 @@ public:
static const SaveLoad _game_language_desc[] = {
SLE_SSTR(LanguageStrings, language, SLE_STR),
SLEG_CONDVAR(_game_saveload_strings, SLE_UINT32, SL_MIN_VERSION, SLV_SAVELOAD_LIST_LENGTH),
SLEG_STRUCTLIST(SlGameLanguageString),
SLEG_CONDVAR("count", _game_saveload_strings, SLE_UINT32, SL_MIN_VERSION, SLV_SAVELOAD_LIST_LENGTH),
SLEG_STRUCTLIST("strings", SlGameLanguageString),
};
static void Load_GSTR()