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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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12
src/saveload/company_sl.cpp
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@@ -294,7 +294,7 @@ public:
SLE_CONDNULL(32, SL_MIN_VERSION, SLV_107),
SLE_CONDNULL(64, SLV_2, SLV_107),
SLEG_STRUCTLIST(SlCompanyOldAIBuildRec),
SLEG_STRUCTLIST("build_rec", SlCompanyOldAIBuildRec),
};
void GenericSaveLoad(CompanyProperties *c) const
@@ -513,11 +513,11 @@ static const SaveLoad _company_desc[] = {
SLE_CONDVAR(CompanyProperties, terraform_limit, SLE_UINT32, SLV_156, SL_MAX_VERSION),
SLE_CONDVAR(CompanyProperties, clear_limit, SLE_UINT32, SLV_156, SL_MAX_VERSION),
SLE_CONDVAR(CompanyProperties, tree_limit, SLE_UINT32, SLV_175, SL_MAX_VERSION),
SLEG_STRUCT(SlCompanySettings),
SLEG_CONDSTRUCT(SlCompanyOldAI, SL_MIN_VERSION, SLV_107),
SLEG_STRUCT(SlCompanyEconomy),
SLEG_STRUCTLIST(SlCompanyOldEconomy),
SLEG_CONDSTRUCTLIST(SlCompanyLiveries, SLV_34, SL_MAX_VERSION),
SLEG_STRUCT("settings", SlCompanySettings),
SLEG_CONDSTRUCT("old_ai", SlCompanyOldAI, SL_MIN_VERSION, SLV_107),
SLEG_STRUCT("cur_economy", SlCompanyEconomy),
SLEG_STRUCTLIST("old_economy", SlCompanyOldEconomy),
SLEG_CONDSTRUCTLIST("liveries", SlCompanyLiveries, SLV_34, SL_MAX_VERSION),
};
static void Save_PLYR()