From 00a52cc4759ecf1bde370ae4d5dfffd7ddae1a6c Mon Sep 17 00:00:00 2001
From: smatz <smatz@openttd.org>
Date: Mon, 3 May 2010 23:36:17 +0000
Subject: (svn r19756) -Codechange: move UpdateViewport() from Vehicle to
 SpecializedVehicle in order to improve performance

---
 src/roadveh_cmd.cpp |  2 +-
 src/ship.h          |  2 +-
 src/ship_cmd.cpp    |  2 +-
 src/train_cmd.cpp   |  4 ++--
 src/vehicle.cpp     |  2 +-
 src/vehicle_base.h  | 32 +++++++++++++++++---------------
 6 files changed, 23 insertions(+), 21 deletions(-)

diff --git a/src/roadveh_cmd.cpp b/src/roadveh_cmd.cpp
index 7c234cc14..f207efaf7 100644
--- a/src/roadveh_cmd.cpp
+++ b/src/roadveh_cmd.cpp
@@ -437,7 +437,7 @@ CommandCost CmdTurnRoadVeh(TileIndex tile, DoCommandFlag flags, uint32 p1, uint3
 
 void RoadVehicle::MarkDirty()
 {
-	for (Vehicle *v = this; v != NULL; v = v->Next()) {
+	for (RoadVehicle *v = this; v != NULL; v = v->Next()) {
 		v->UpdateViewport(false, false);
 	}
 	this->CargoChanged();
diff --git a/src/ship.h b/src/ship.h
index 2138e732e..0a271e637 100644
--- a/src/ship.h
+++ b/src/ship.h
@@ -14,7 +14,7 @@
 
 #include "vehicle_base.h"
 
-void RecalcShipStuff(Vehicle *v);
+void RecalcShipStuff(Ship *v);
 void GetShipSpriteSize(EngineID engine, uint &width, uint &height);
 
 /**
diff --git a/src/ship_cmd.cpp b/src/ship_cmd.cpp
index 5de839bf7..8e12a9f6e 100644
--- a/src/ship_cmd.cpp
+++ b/src/ship_cmd.cpp
@@ -292,7 +292,7 @@ void Ship::UpdateDeltaXY(Direction direction)
 	this->z_extent      = 6;
 }
 
-void RecalcShipStuff(Vehicle *v)
+void RecalcShipStuff(Ship *v)
 {
 	v->UpdateViewport(false, true);
 	SetWindowDirty(WC_VEHICLE_DEPOT, v->tile);
diff --git a/src/train_cmd.cpp b/src/train_cmd.cpp
index 3143624bd..f1260f7ff 100644
--- a/src/train_cmd.cpp
+++ b/src/train_cmd.cpp
@@ -1771,7 +1771,7 @@ static void ReverseTrainDirection(Train *v)
 	v->ConsistChanged(true);
 
 	/* update all images */
-	for (Vehicle *u = v; u != NULL; u = u->Next()) u->UpdateViewport(false, false);
+	for (Train *u = v; u != NULL; u = u->Next()) u->UpdateViewport(false, false);
 
 	/* update crossing we were approaching */
 	if (crossing != INVALID_TILE) UpdateLevelCrossing(crossing);
@@ -2806,7 +2806,7 @@ TileIndex Train::GetOrderStationLocation(StationID station)
 
 void Train::MarkDirty()
 {
-	Vehicle *v = this;
+	Train *v = this;
 	do {
 		v->UpdateViewport(false, false);
 	} while ((v = v->Next()) != NULL);
diff --git a/src/vehicle.cpp b/src/vehicle.cpp
index 8d902b241..e14d4979c 100644
--- a/src/vehicle.cpp
+++ b/src/vehicle.cpp
@@ -1069,7 +1069,7 @@ void VehicleEnterDepot(Vehicle *v)
 		case VEH_SHIP:
 			SetWindowClassesDirty(WC_SHIPS_LIST);
 			Ship::From(v)->state = TRACK_BIT_DEPOT;
-			RecalcShipStuff(v);
+			RecalcShipStuff(Ship::From(v));
 			break;
 
 		case VEH_AIRCRAFT:
diff --git a/src/vehicle_base.h b/src/vehicle_base.h
index bea248538..ea626a40f 100644
--- a/src/vehicle_base.h
+++ b/src/vehicle_base.h
@@ -317,21 +317,6 @@ public:
 	 */
 	virtual uint Crash(bool flooded = false);
 
-	/**
-	 * Update vehicle sprite- and position caches
-	 * @param moved Was the vehicle moved?
-	 * @param turned Did the vehicle direction change?
-	 */
-	inline void UpdateViewport(bool moved, bool turned)
-	{
-		extern void VehicleMove(Vehicle *v, bool update_viewport);
-
-		if (turned) this->UpdateDeltaXY(this->direction);
-		SpriteID old_image = this->cur_image;
-		this->cur_image = this->GetImage(this->direction);
-		if (moved || this->cur_image != old_image) VehicleMove(this, true);
-	}
-
 	/**
 	 * Returns the Trackdir on which the vehicle is currently located.
 	 * Works for trains and ships.
@@ -661,6 +646,23 @@ struct SpecializedVehicle : public Vehicle {
 		assert(v->type == Type);
 		return (const T *)v;
 	}
+
+	/**
+	 * Update vehicle sprite- and position caches
+	 * @param moved Was the vehicle moved?
+	 * @param turned Did the vehicle direction change?
+	 */
+	FORCEINLINE void UpdateViewport(bool moved, bool turned)
+	{
+		extern void VehicleMove(Vehicle *v, bool update_viewport);
+
+		/* Explicitly choose method to call to prevent vtable dereference -
+		 * it gives ~3% runtime improvements in games with many vehicles */
+		if (turned) ((T *)this)->T::UpdateDeltaXY(this->direction);
+		SpriteID old_image = this->cur_image;
+		this->cur_image = ((T *)this)->T::GetImage(this->direction);
+		if (moved || this->cur_image != old_image) VehicleMove(this, true);
+	}
 };
 
 #define FOR_ALL_VEHICLES_OF_TYPE(name, var) FOR_ALL_ITEMS_FROM(name, vehicle_index, var, 0) if (var->type == name::EXPECTED_TYPE)
-- 
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