# HG changeset patch
# User frosch <frosch@openttd.org>
# Date 2009-11-24 13:12:34
# Node ID 60d669a7b9e132fb52f0d1246624aa71f11aeb51
# Parent  5b166753db48a342e12292e244e1c513e82a6c44

(svn r18266) -Codechange: Add a function to compute prices from price base and cost factor and use it consistently for vehicle purchase, running cost, and refit cost.

diff --git a/src/aircraft_cmd.cpp b/src/aircraft_cmd.cpp
--- a/src/aircraft_cmd.cpp
+++ b/src/aircraft_cmd.cpp
@@ -540,7 +540,9 @@ static void CheckIfAircraftNeedsService(
 
 Money Aircraft::GetRunningCost() const
 {
-	return GetVehicleProperty(this, PROP_AIRCRAFT_RUNNING_COST_FACTOR, AircraftVehInfo(this->engine_type)->running_cost) * _price[PR_RUNNING_AIRCRAFT];
+	const Engine *e = Engine::Get(this->engine_type);
+	uint cost_factor = GetVehicleProperty(this, PROP_AIRCRAFT_RUNNING_COST_FACTOR, e->u.air.running_cost);
+	return GetPrice(PR_RUNNING_AIRCRAFT, cost_factor);
 }
 
 void Aircraft::OnNewDay()
diff --git a/src/economy.cpp b/src/economy.cpp
--- a/src/economy.cpp
+++ b/src/economy.cpp
@@ -788,15 +788,25 @@ void InitializeEconomy()
 }
 
 /**
- * Determine a certain base price with range checking
- * @param index Price of interest
- * @return Base price, or zero if out of range
+ * Determine a certain price
+ * @param index Price base
+ * @param cost_factor Price factor
+ * @param shift Extra bit shifting after the computation
+ * @return Price
  */
-Money GetPriceByIndex(Price index)
+Money GetPrice(Price index, uint cost_factor, int shift)
 {
 	if (index >= PR_END) return 0;
 
-	return _price[index];
+	Money cost = _price[index] * cost_factor;
+
+	if (shift >= 0) {
+		cost <<= shift;
+	} else {
+		cost >>= -shift;
+	}
+
+	return cost;
 }
 
 Money GetTransportedGoodsIncome(uint num_pieces, uint dist, byte transit_days, CargoID cargo_type)
diff --git a/src/economy_func.h b/src/economy_func.h
--- a/src/economy_func.h
+++ b/src/economy_func.h
@@ -41,7 +41,7 @@ uint MoveGoodsToStation(CargoID type, ui
 void PrepareUnload(Vehicle *front_v);
 void LoadUnloadStation(Station *st);
 
-Money GetPriceByIndex(Price index);
+Money GetPrice(Price index, uint cost_factor, int shift = 0);
 
 void InitializeEconomy();
 void RecomputePrices();
diff --git a/src/engine.cpp b/src/engine.cpp
--- a/src/engine.cpp
+++ b/src/engine.cpp
@@ -204,48 +204,71 @@ uint Engine::GetDisplayDefaultCapacity(u
 
 Money Engine::GetRunningCost() const
 {
+	Price base_price;
+	uint cost_factor;
 	switch (this->type) {
-		case VEH_ROAD: {
-			if (this->u.road.running_cost_class == INVALID_PRICE) return 0;
-			return GetEngineProperty(this->index, PROP_ROADVEH_RUNNING_COST_FACTOR, this->u.road.running_cost) * GetPriceByIndex(this->u.road.running_cost_class) >> 8;
-		}
+		case VEH_ROAD:
+			base_price = this->u.road.running_cost_class;
+			if (base_price == INVALID_PRICE) return 0;
+			cost_factor = GetEngineProperty(this->index, PROP_ROADVEH_RUNNING_COST_FACTOR, this->u.road.running_cost);
+			break;
 
-		case VEH_TRAIN: {
-			if (this->u.rail.running_cost_class == INVALID_PRICE) return 0;
-			return GetEngineProperty(this->index, PROP_TRAIN_RUNNING_COST_FACTOR, this->u.rail.running_cost) * GetPriceByIndex(this->u.rail.running_cost_class) >> 8;
-		}
+		case VEH_TRAIN:
+			base_price = this->u.rail.running_cost_class;
+			if (base_price == INVALID_PRICE) return 0;
+			cost_factor = GetEngineProperty(this->index, PROP_TRAIN_RUNNING_COST_FACTOR, this->u.rail.running_cost);
+			break;
 
 		case VEH_SHIP:
-			return GetEngineProperty(this->index, PROP_SHIP_RUNNING_COST_FACTOR, this->u.ship.running_cost) * _price[PR_RUNNING_SHIP] >> 8;
+			base_price = PR_RUNNING_SHIP;
+			cost_factor = GetEngineProperty(this->index, PROP_SHIP_RUNNING_COST_FACTOR, this->u.ship.running_cost);
+			break;
 
 		case VEH_AIRCRAFT:
-			return GetEngineProperty(this->index, PROP_AIRCRAFT_RUNNING_COST_FACTOR, this->u.air.running_cost) * _price[PR_RUNNING_AIRCRAFT] >> 8;
+			base_price = PR_RUNNING_AIRCRAFT;
+			cost_factor = GetEngineProperty(this->index, PROP_AIRCRAFT_RUNNING_COST_FACTOR, this->u.air.running_cost);
+			break;
 
 		default: NOT_REACHED();
 	}
+
+	return GetPrice(base_price, cost_factor, -8);
 }
 
 Money Engine::GetCost() const
 {
+	Price base_price;
+	uint cost_factor;
 	switch (this->type) {
 		case VEH_ROAD:
-			return GetEngineProperty(this->index, PROP_ROADVEH_COST_FACTOR, this->u.road.cost_factor) * (_price[PR_BUILD_VEHICLE_ROAD] >> 3) >> 5;
+			base_price = PR_BUILD_VEHICLE_ROAD;
+			cost_factor = GetEngineProperty(this->index, PROP_ROADVEH_COST_FACTOR, this->u.road.cost_factor);
+			break;
 
 		case VEH_TRAIN:
 			if (this->u.rail.railveh_type == RAILVEH_WAGON) {
-				return (GetEngineProperty(this->index, PROP_TRAIN_COST_FACTOR, this->u.rail.cost_factor) * _price[PR_BUILD_VEHICLE_WAGON]) >> 8;
+				base_price = PR_BUILD_VEHICLE_WAGON;
+				cost_factor = GetEngineProperty(this->index, PROP_TRAIN_COST_FACTOR, this->u.rail.cost_factor);
 			} else {
-				return GetEngineProperty(this->index, PROP_TRAIN_COST_FACTOR, this->u.rail.cost_factor) * (_price[PR_BUILD_VEHICLE_TRAIN] >> 3) >> 5;
+				base_price = PR_BUILD_VEHICLE_TRAIN;
+				cost_factor = GetEngineProperty(this->index, PROP_TRAIN_COST_FACTOR, this->u.rail.cost_factor);
 			}
+			break;
 
 		case VEH_SHIP:
-			return GetEngineProperty(this->index, PROP_SHIP_COST_FACTOR, this->u.ship.cost_factor) * (_price[PR_BUILD_VEHICLE_SHIP] >> 3) >> 5;
+			base_price = PR_BUILD_VEHICLE_SHIP;
+			cost_factor = GetEngineProperty(this->index, PROP_SHIP_COST_FACTOR, this->u.ship.cost_factor);
+			break;
 
 		case VEH_AIRCRAFT:
-			return GetEngineProperty(this->index, PROP_AIRCRAFT_COST_FACTOR, this->u.air.cost_factor) * (_price[PR_BUILD_VEHICLE_AIRCRAFT] >> 3) >> 5;
+			base_price = PR_BUILD_VEHICLE_AIRCRAFT;
+			cost_factor = GetEngineProperty(this->index, PROP_AIRCRAFT_COST_FACTOR, this->u.air.cost_factor);
+			break;
 
 		default: NOT_REACHED();
 	}
+
+	return GetPrice(base_price, cost_factor, -8);
 }
 
 /**
diff --git a/src/roadveh_cmd.cpp b/src/roadveh_cmd.cpp
--- a/src/roadveh_cmd.cpp
+++ b/src/roadveh_cmd.cpp
@@ -1827,13 +1827,13 @@ static bool RoadVehController(RoadVehicl
 
 Money RoadVehicle::GetRunningCost() const
 {
-	const RoadVehicleInfo *rvi = RoadVehInfo(this->engine_type);
-	if (rvi->running_cost_class == INVALID_PRICE) return 0;
+	const Engine *e = Engine::Get(this->engine_type);
+	if (e->u.road.running_cost_class == INVALID_PRICE) return 0;
 
-	uint cost_factor = GetVehicleProperty(this, PROP_ROADVEH_RUNNING_COST_FACTOR, rvi->running_cost);
+	uint cost_factor = GetVehicleProperty(this, PROP_ROADVEH_RUNNING_COST_FACTOR, e->u.road.running_cost);
 	if (cost_factor == 0) return 0;
 
-	return cost_factor * GetPriceByIndex(rvi->running_cost_class);
+	return GetPrice(e->u.road.running_cost_class, cost_factor);
 }
 
 bool RoadVehicle::Tick()
diff --git a/src/ship_cmd.cpp b/src/ship_cmd.cpp
--- a/src/ship_cmd.cpp
+++ b/src/ship_cmd.cpp
@@ -159,7 +159,9 @@ static void CheckIfShipNeedsService(Vehi
 
 Money Ship::GetRunningCost() const
 {
-	return GetVehicleProperty(this, PROP_SHIP_RUNNING_COST_FACTOR, ShipVehInfo(this->engine_type)->running_cost) * _price[PR_RUNNING_SHIP];
+	const Engine *e = Engine::Get(this->engine_type);
+	uint cost_factor = GetVehicleProperty(this, PROP_SHIP_RUNNING_COST_FACTOR, e->u.ship.running_cost);
+	return GetPrice(PR_RUNNING_SHIP, cost_factor);
 }
 
 void Ship::OnNewDay()
diff --git a/src/train_cmd.cpp b/src/train_cmd.cpp
--- a/src/train_cmd.cpp
+++ b/src/train_cmd.cpp
@@ -4443,16 +4443,16 @@ Money Train::GetRunningCost() const
 	const Train *v = this;
 
 	do {
-		const RailVehicleInfo *rvi = RailVehInfo(v->engine_type);
-		if (rvi->running_cost_class == INVALID_PRICE) continue;
-
-		uint cost_factor = GetVehicleProperty(v, PROP_TRAIN_RUNNING_COST_FACTOR, rvi->running_cost);
+		const Engine *e = Engine::Get(v->engine_type);
+		if (e->u.rail.running_cost_class == INVALID_PRICE) continue;
+
+		uint cost_factor = GetVehicleProperty(v, PROP_TRAIN_RUNNING_COST_FACTOR, e->u.rail.running_cost);
 		if (cost_factor == 0) continue;
 
 		/* Halve running cost for multiheaded parts */
 		if (v->IsMultiheaded()) cost_factor /= 2;
 
-		cost += cost_factor * GetPriceByIndex(rvi->running_cost_class);
+		cost += GetPrice(e->u.rail.running_cost_class, cost_factor);
 	} while ((v = v->GetNextVehicle()) != NULL);
 
 	return cost;
diff --git a/src/vehicle_cmd.cpp b/src/vehicle_cmd.cpp
--- a/src/vehicle_cmd.cpp
+++ b/src/vehicle_cmd.cpp
@@ -262,33 +262,35 @@ CommandCost CmdDepotMassAutoReplace(Tile
  */
 static CommandCost GetRefitCost(EngineID engine_type)
 {
-	Money base_cost;
 	ExpensesType expense_type;
 	const Engine *e = Engine::Get(engine_type);
+	Price base_price;
+	uint cost_factor = e->info.refit_cost;
 	switch (e->type) {
 		case VEH_SHIP:
-			base_cost = _price[PR_BUILD_VEHICLE_SHIP];
+			base_price = PR_BUILD_VEHICLE_SHIP;
 			expense_type = EXPENSES_SHIP_RUN;
 			break;
 
 		case VEH_ROAD:
-			base_cost = _price[PR_BUILD_VEHICLE_ROAD];
+			base_price = PR_BUILD_VEHICLE_ROAD;
 			expense_type = EXPENSES_ROADVEH_RUN;
 			break;
 
 		case VEH_AIRCRAFT:
-			base_cost = _price[PR_BUILD_VEHICLE_AIRCRAFT];
+			base_price = PR_BUILD_VEHICLE_AIRCRAFT;
 			expense_type = EXPENSES_AIRCRAFT_RUN;
 			break;
 
 		case VEH_TRAIN:
-			base_cost = 2 * _price[(e->u.rail.railveh_type == RAILVEH_WAGON) ? PR_BUILD_VEHICLE_WAGON : PR_BUILD_VEHICLE_TRAIN];
+			base_price = (e->u.rail.railveh_type == RAILVEH_WAGON) ? PR_BUILD_VEHICLE_WAGON : PR_BUILD_VEHICLE_TRAIN;
+			cost_factor <<= 1;
 			expense_type = EXPENSES_TRAIN_RUN;
 			break;
 
 		default: NOT_REACHED();
 	}
-	return CommandCost(expense_type, (e->info.refit_cost * base_cost) >> 10);
+	return CommandCost(expense_type, GetPrice(base_price, cost_factor, -10));
 }
 
 /**