From 0052c85002e8e5631fa09a0b726b0c65c6350b93 Mon Sep 17 00:00:00 2001
From: peter1138 <peter1138@openttd.org>
Date: Thu, 8 Jan 2009 21:48:59 +0000
Subject: (svn r14926) -Feature: Automatically set last engine ageing year to
 the last 'introduction year plus half model life', to allow engines later
 than 2050 to appear.

---
 src/engine.cpp    | 34 +++++++++++++++++++++++++++-------
 src/engine_func.h |  1 +
 src/newgrf.cpp    |  2 ++
 3 files changed, 30 insertions(+), 7 deletions(-)

diff --git a/src/engine.cpp b/src/engine.cpp
index c8a256f10..dfe24168b 100644
--- a/src/engine.cpp
+++ b/src/engine.cpp
@@ -32,10 +32,9 @@
 
 DEFINE_OLD_POOL_GENERIC(Engine, Engine)
 
-enum {
-	YEAR_ENGINE_AGING_STOPS = 2050,
-};
-
+/** Year that engine aging stops. Engines will not reduce in reliability
+ * and no more engines will be introduced */
+Year _year_engine_aging_stops;
 
 /** Number of engines of each vehicle type in original engine data */
 const uint8 _engine_counts[4] = {
@@ -231,11 +230,32 @@ static void CalcEngineReliability(Engine *e)
 	InvalidateWindowClasses(WC_REPLACE_VEHICLE);
 }
 
+void SetYearEngineAgingStops()
+{
+	/* Determine last engine aging year, default to 2050 as previously. */
+	_year_engine_aging_stops = 2050;
+
+	const Engine *e;
+	FOR_ALL_ENGINES(e) {
+		const EngineInfo *ei = &e->info;
+
+		/* Exclude certain engines */
+		if (!HasBit(ei->climates, _settings_game.game_creation.landscape)) continue;
+		if (e->type == VEH_TRAIN && e->u.rail.railveh_type == RAILVEH_WAGON) continue;
+
+		/* Base year ending date on half the model life */
+		YearMonthDay ymd;
+		ConvertDateToYMD(ei->base_intro + (ei->lifelength * 366) / 2, &ymd);
+
+		_year_engine_aging_stops = max(_year_engine_aging_stops, ymd.year);
+	}
+}
+
 void StartupEngines()
 {
 	Engine *e;
 	/* Aging of vehicles stops, so account for that when starting late */
-	const Date aging_date = min(_date, ConvertYMDToDate(YEAR_ENGINE_AGING_STOPS, 0, 1));
+	const Date aging_date = min(_date, ConvertYMDToDate(_year_engine_aging_stops, 0, 1));
 
 	FOR_ALL_ENGINES(e) {
 		const EngineInfo *ei = &e->info;
@@ -336,7 +356,7 @@ static CompanyID GetBestCompany(uint8 pp)
 
 void EnginesDailyLoop()
 {
-	if (_cur_year >= YEAR_ENGINE_AGING_STOPS) return;
+	if (_cur_year >= _year_engine_aging_stops) return;
 
 	Engine *e;
 	FOR_ALL_ENGINES(e) {
@@ -447,7 +467,7 @@ static void NewVehicleAvailable(Engine *e)
 
 void EnginesMonthlyLoop()
 {
-	if (_cur_year < YEAR_ENGINE_AGING_STOPS) {
+	if (_cur_year < _year_engine_aging_stops) {
 		Engine *e;
 		FOR_ALL_ENGINES(e) {
 			/* Age the vehicle */
diff --git a/src/engine_func.h b/src/engine_func.h
index 942f90d1a..12d7514e7 100644
--- a/src/engine_func.h
+++ b/src/engine_func.h
@@ -29,5 +29,6 @@ bool IsEngineBuildable(EngineID engine, VehicleType type, CompanyID company);
 bool IsEngineRefittable(EngineID engine);
 CargoID GetEngineCargoType(EngineID engine);
 void SetCachedEngineCounts();
+void SetYearEngineAgingStops();
 
 #endif /* ENGINE_H */
diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index e0cff5836..915cd3f99 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -6039,6 +6039,8 @@ static void AfterLoadGRFs()
 		}
 	}
 
+	SetYearEngineAgingStops();
+
 	/* Deallocate temporary loading data */
 	free(_gted);
 	_grm_sprites.clear();
-- 
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