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Change: Synchronize introduction date and reliability randomness across vehicles with the same base introduction date (#7147)

This commit is contained in:
Eddi-z 2019-03-02 22:28:22 +01:00 committed by PeterN
parent 5e40338543
commit 8139b14e9c
1 changed files with 8 additions and 0 deletions
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8
src/engine.cpp
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@ -652,7 +652,14 @@ void StartupOneEngine(Engine *e, Date aging_date)
/* Don't randomise the start-date in the first two years after gamestart to ensure availability
* of engines in early starting games.
* Note: TTDP uses fixed 1922 */
SavedRandomSeeds saved_seeds;
SaveRandomSeeds(&saved_seeds);
SetRandomSeed(_settings_game.game_creation.generation_seed ^
ei->base_intro ^
e->type ^
e->GetGRFID());
uint32 r = Random();
e->intro_date = ei->base_intro <= ConvertYMDToDate(_settings_game.game_creation.starting_year + 2, 0, 1) ? ei->base_intro : (Date)GB(r, 0, 9) + ei->base_intro;
if (e->intro_date <= _date) {
e->age = (aging_date - e->intro_date) >> 5;
@ -672,6 +679,7 @@ void StartupOneEngine(Engine *e, Date aging_date)
e->reliability_spd_dec = ei->decay_speed << 2;
RestoreRandomSeeds(saved_seeds);
CalcEngineReliability(e);
/* prevent certain engines from ever appearing. */