(svn r21098) -Codechange: Ships now store their max speed in the cache instead of recalculating it every time.

src/economy.cpp

@@ -1228,9 +1228,11 @@ static void LoadUnloadVehicle(Vehicle *v, int *cargo_left)
 		/* update stats */
 		int t;
 		switch (u->type) {
-			case VEH_TRAIN:    t = u->vcache.cached_max_speed; break;
+			case VEH_TRAIN: /* FALL THROUGH */
+			case VEH_SHIP:
+				t = u->vcache.cached_max_speed;
+				break;
 			case VEH_ROAD:     t = u->max_speed / 2;        break;
-			case VEH_SHIP:     t = u->max_speed;            break;
 			case VEH_AIRCRAFT: t = Aircraft::From(u)->GetSpeedOldUnits(); break; // Convert to old units.
 			default: NOT_REACHED();
 		}

src/newgrf_engine.cpp

@@ -717,7 +717,8 @@ static uint32 VehicleGetVariable(const ResolverObject *object, byte variable, by
 		case 0x19: {
 			uint max_speed;
 			switch (v->type) {
-				case VEH_TRAIN:
+				case VEH_TRAIN: /* FALL THROUGH */
+				case VEH_SHIP:
 					max_speed = v->vcache.cached_max_speed;
 					break;
 

src/saveload/vehicle_sl.cpp

@@ -313,20 +313,32 @@ void AfterLoadVehicles(bool part_of_load)
 	FOR_ALL_VEHICLES(v) {
 		assert(v->first != NULL);
 
-		if (v->type == VEH_TRAIN) {
-			Train *t = Train::From(v);
-			if (t->IsFrontEngine() || t->IsFreeWagon()) {
-				t->tcache.last_speed = t->cur_speed; // update displayed train speed
-				t->ConsistChanged(false);
-			}
-		} else if (v->type == VEH_ROAD) {
-			RoadVehicle *rv = RoadVehicle::From(v);
-			if (rv->IsRoadVehFront()) {
-				RoadVehUpdateCache(rv);
-				if (_settings_game.vehicle.roadveh_acceleration_model != AM_ORIGINAL) {
-					rv->CargoChanged();
+		switch (v->type) {
+			case VEH_TRAIN: {
+				Train *t = Train::From(v);
+				if (t->IsFrontEngine() || t->IsFreeWagon()) {
+					t->tcache.last_speed = t->cur_speed; // update displayed train speed
+					t->ConsistChanged(false);
 				}
+				break;
 			}
+
+			case VEH_ROAD: {
+				RoadVehicle *rv = RoadVehicle::From(v);
+				if (rv->IsRoadVehFront()) {
+					RoadVehUpdateCache(rv);
+					if (_settings_game.vehicle.roadveh_acceleration_model != AM_ORIGINAL) {
+						rv->CargoChanged();
+					}
+				}
+				break;
+			}
+
+			case VEH_SHIP:
+				Ship::From(v)->UpdateCache();
+				break;
+
+			default: break;
 		}
 	}
 

src/ship.h

@@ -35,7 +35,7 @@ struct Ship: public SpecializedVehicle<Ship, VEH_SHIP> {
 	bool IsPrimaryVehicle() const { return true; }
 	SpriteID GetImage(Direction direction) const;
 	int GetDisplaySpeed() const { return this->cur_speed / 2; }
-	int GetDisplayMaxSpeed() const { return this->max_speed / 2; }
+	int GetDisplayMaxSpeed() const { return this->vcache.cached_max_speed / 2; }
 	Money GetRunningCost() const;
 	bool IsInDepot() const { return this->state == TRACK_BIT_DEPOT; }
 	bool Tick();
@@ -43,6 +43,7 @@ struct Ship: public SpecializedVehicle<Ship, VEH_SHIP> {
 	Trackdir GetVehicleTrackdir() const;
 	TileIndex GetOrderStationLocation(StationID station);
 	bool FindClosestDepot(TileIndex *location, DestinationID *destination, bool *reverse);
+	void UpdateCache();
 };
 
 #define FOR_ALL_SHIPS(var) FOR_ALL_VEHICLES_OF_TYPE(Ship, var)

src/ship_cmd.cpp

@@ -153,6 +153,11 @@ static void CheckIfShipNeedsService(Vehicle *v)
 	SetWindowWidgetDirty(WC_VEHICLE_VIEW, v->index, VVW_WIDGET_START_STOP_VEH);
 }
 
+void Ship::UpdateCache()
+{
+	this->vcache.cached_max_speed = GetVehicleProperty(this, PROP_SHIP_SPEED, this->max_speed);
+}
+
 Money Ship::GetRunningCost() const
 {
 	const Engine *e = Engine::Get(this->engine_type);
@@ -296,7 +301,7 @@ static bool ShipAccelerate(Vehicle *v)
 	uint spd;
 	byte t;
 
-	spd = min(v->cur_speed + 1, GetVehicleProperty(v, PROP_SHIP_SPEED, v->max_speed));
+	spd = min(v->cur_speed + 1, v->vcache.cached_max_speed);
 
 	/* updates statusbar only if speed have changed to save CPU time */
 	if (spd != v->cur_speed) {
@@ -615,6 +620,8 @@ CommandCost CmdBuildShip(TileIndex tile, DoCommandFlag flags, const Engine *e, u
 		v->cur_image = SPR_IMG_QUERY;
 		v->random_bits = VehicleRandomBits();
 
+		v->UpdateCache();
+
 		if (e->flags & ENGINE_EXCLUSIVE_PREVIEW) SetBit(v->vehicle_flags, VF_BUILT_AS_PROTOTYPE);
 
 		v->InvalidateNewGRFCacheOfChain();

src/vehicle.cpp

@@ -1163,6 +1163,7 @@ void VehicleEnterDepot(Vehicle *v)
 			SetWindowClassesDirty(WC_SHIPS_LIST);
 			Ship *ship = Ship::From(v);
 			ship->state = TRACK_BIT_DEPOT;
+			ship->UpdateCache();
 			ship->UpdateViewport(true, true);
 			SetWindowDirty(WC_VEHICLE_DEPOT, v->tile);
 			break;

src/vehicle_gui.cpp

@@ -807,7 +807,7 @@ static int CDECL VehicleReliabilitySorter(const Vehicle * const *a, const Vehicl
 static int CDECL VehicleMaxSpeedSorter(const Vehicle * const *a, const Vehicle * const *b)
 {
 	int r = 0;
-	if (((*a)->type == VEH_TRAIN && (*b)->type == VEH_TRAIN) || ((*a)->type == VEH_AIRCRAFT && (*b)->type == VEH_AIRCRAFT)) {
+	if ((*a)->type != VEH_ROAD && (*b)->type != VEH_ROAD) {
 		r = (*a)->vcache.cached_max_speed - (*b)->vcache.cached_max_speed;
 	} else {
 		r = (*a)->max_speed - (*b)->max_speed;