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Change: Add extra random seed to StartupEngines(). 

This means that calling reset_engines will rerandomise introduction dates
and reliability.

Probably not necessary.
This commit is contained in:
Peter Nelson 2022-12-12 11:17:55 +00:00 committed by PeterN
parent 74180efe7f
commit cbf48c4dd9
3 changed files with 8 additions and 6 deletions
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10
src/engine.cpp
View File

@ -648,8 +648,9 @@ void SetYearEngineAgingStops()
* Start/initialise one engine.
* @param e The engine to initialise.
* @param aging_date The date used for age calculations.
* @param seed Random seed.
*/
void StartupOneEngine(Engine *e, Date aging_date)
void StartupOneEngine(Engine *e, Date aging_date, uint32 seed)
{
const EngineInfo *ei = &e->info;
@ -662,7 +663,7 @@ void StartupOneEngine(Engine *e, Date aging_date)
* Make sure they use the same randomisation of the date. */
SavedRandomSeeds saved_seeds;
SaveRandomSeeds(&saved_seeds);
SetRandomSeed(_settings_game.game_creation.generation_seed ^
SetRandomSeed(_settings_game.game_creation.generation_seed ^ seed ^
ei->base_intro ^
e->type ^
e->GetGRFID());
@ -684,7 +685,7 @@ void StartupOneEngine(Engine *e, Date aging_date)
re = Engine::Get(re->info.variant_id);
}
SetRandomSeed(_settings_game.game_creation.generation_seed ^
SetRandomSeed(_settings_game.game_creation.generation_seed ^ seed ^
(re->index << 16) ^ (re->info.base_intro << 12) ^ (re->info.decay_speed << 8) ^
(re->info.lifelength << 4) ^ re->info.retire_early ^
e->type ^
@ -719,9 +720,10 @@ void StartupEngines()
{
/* Aging of vehicles stops, so account for that when starting late */
const Date aging_date = std::min(_date, ConvertYMDToDate(_year_engine_aging_stops, 0, 1));
uint32 seed = Random();
for (Engine *e : Engine::Iterate()) {
StartupOneEngine(e, aging_date);
StartupOneEngine(e, aging_date, seed);
}
for (Engine *e : Engine::Iterate()) {
CalcEngineReliability(e, false);

2
src/engine_func.h
View File

@ -27,7 +27,7 @@ bool IsEngineRefittable(EngineID engine);
void GetArticulatedVehicleCargoesAndRefits(EngineID engine, CargoArray *cargoes, CargoTypes *refits, CargoID cargo_type, uint cargo_capacity);
void SetYearEngineAgingStops();
void CalcEngineReliability(Engine *e, bool new_month);
void StartupOneEngine(Engine *e, Date aging_date);
void StartupOneEngine(Engine *e, Date aging_date, uint32 seed);
uint GetTotalCapacityOfArticulatedParts(EngineID engine);

2
src/saveload/oldloader_sl.cpp
View File

@ -401,7 +401,7 @@ static bool FixTTOEngines()
if (oi == 255) {
/* Default engine is used */
_date += DAYS_TILL_ORIGINAL_BASE_YEAR;
StartupOneEngine(e, aging_date);
StartupOneEngine(e, aging_date, 0);
CalcEngineReliability(e, false);
e->intro_date -= DAYS_TILL_ORIGINAL_BASE_YEAR;
_date -= DAYS_TILL_ORIGINAL_BASE_YEAR;