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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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6
src/saveload/town_sl.cpp
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@@ -278,9 +278,9 @@ static const SaveLoad _town_desc[] = {
SLE_CONDNULL(8, SLV_EXTEND_CARGOTYPES, SLV_REMOVE_TOWN_CARGO_CACHE), ///< cargo_produced, no longer in use
SLE_CONDNULL(30, SLV_2, SLV_REMOVE_TOWN_CARGO_CACHE), ///< old reserved space
SLEG_CONDSTRUCTLIST(SlTownSupplied, SLV_165, SL_MAX_VERSION),
SLEG_CONDSTRUCTLIST(SlTownReceived, SLV_165, SL_MAX_VERSION),
SLEG_CONDSTRUCTLIST(SlTownAcceptanceMatrix, SLV_166, SLV_REMOVE_TOWN_CARGO_CACHE),
SLEG_CONDSTRUCTLIST("supplied", SlTownSupplied, SLV_165, SL_MAX_VERSION),
SLEG_CONDSTRUCTLIST("received", SlTownReceived, SLV_165, SL_MAX_VERSION),
SLEG_CONDSTRUCTLIST("acceptance_matrix", SlTownAcceptanceMatrix, SLV_166, SLV_REMOVE_TOWN_CARGO_CACHE),
};
static void Save_HIDS()