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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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4
src/saveload/map_sl.cpp
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@@ -21,8 +21,8 @@ static uint32 _map_dim_x;
static uint32 _map_dim_y;
static const SaveLoad _map_desc[] = {
SLEG_CONDVAR(_map_dim_x, SLE_UINT32, SLV_6, SL_MAX_VERSION),
SLEG_CONDVAR(_map_dim_y, SLE_UINT32, SLV_6, SL_MAX_VERSION),
SLEG_CONDVAR("dim_x", _map_dim_x, SLE_UINT32, SLV_6, SL_MAX_VERSION),
SLEG_CONDVAR("dim_y", _map_dim_y, SLE_UINT32, SLV_6, SL_MAX_VERSION),
};
static void Save_MAPS()