From db9706cb800b0cfa20d36551c796f81619707173 Mon Sep 17 00:00:00 2001
From: celestar <celestar@openttd.org>
Date: Fri, 24 Mar 2006 15:24:16 +0000
Subject: [PATCH] (svn r4088) -Codechange: Introduce {Unb,B}arCrossing and
 IsCrossingBarred to put and get the status of a level crossing

---
 road_cmd.c  |  9 ++++-----
 road_map.h  | 14 ++++++++++++++
 train_cmd.c |  8 ++++----
 3 files changed, 22 insertions(+), 9 deletions(-)

diff --git a/road_cmd.c b/road_cmd.c
index 82284a7f9e..fcc7ecd7ac 100644
--- a/road_cmd.c
+++ b/road_cmd.c
@@ -776,7 +776,7 @@ static void DrawTile_Road(TileInfo *ti)
 
 			if (GetCrossingRoadAxis(ti->tile) == AXIS_X) image++;
 
-			if ((ti->map5 & 4) != 0) image += 2;
+			if (IsCrossingBarred(ti->tile)) image += 2;
 
 			if ( _m[ti->tile].m4 & 0x80) {
 				image += 8;
@@ -1059,10 +1059,10 @@ static uint32 VehicleEnter_Road(Vehicle *v, TileIndex tile, int x, int y)
 {
 	switch (GetRoadType(tile)) {
 		case ROAD_CROSSING:
-			if (v->type == VEH_Train && GB(_m[tile].m5, 2, 1) == 0) {
+			if (v->type == VEH_Train && !IsCrossingBarred(tile)) {
 				/* train crossing a road */
 				SndPlayVehicleFx(SND_0E_LEVEL_CROSSING, v);
-				SB(_m[tile].m5, 2, 1, 1);
+				BarCrossing(tile);
 				MarkTileDirtyByTile(tile);
 			}
 			break;
@@ -1084,8 +1084,7 @@ static uint32 VehicleEnter_Road(Vehicle *v, TileIndex tile, int x, int y)
 static void VehicleLeave_Road(Vehicle *v, TileIndex tile, int x, int y)
 {
 	if (IsLevelCrossing(tile) && v->type == VEH_Train && v->next == NULL) {
-		// Turn off level crossing lights
-		SB(_m[tile].m5, 2, 1, 0);
+		UnbarCrossing(tile);
 		MarkTileDirtyByTile(tile);
 	}
 }
diff --git a/road_map.h b/road_map.h
index feb7656cbe..412616a652 100644
--- a/road_map.h
+++ b/road_map.h
@@ -66,6 +66,20 @@ static inline void SetCrossingRoadOwner(TileIndex t, Owner o)
 	_m[t].m3 = o;
 }
 
+static inline void UnbarCrossing(TileIndex t)
+{
+	CLRBIT(_m[t].m5, 2);
+}
+
+static inline void BarCrossing(TileIndex t)
+{
+	SETBIT(_m[t].m5, 2);
+}
+
+static inline bool IsCrossingBarred(TileIndex t)
+{
+	return HASBIT(_m[t].m5, 2);
+}
 
 typedef enum RoadType {
 	ROAD_NORMAL,
diff --git a/train_cmd.c b/train_cmd.c
index e9c58bae9c..354b86aea3 100644
--- a/train_cmd.c
+++ b/train_cmd.c
@@ -1482,8 +1482,8 @@ static void DisableTrainCrossing(TileIndex tile)
 	if (IsTileType(tile, MP_STREET) &&
 			IsLevelCrossing(tile) &&
 			VehicleFromPos(tile, &tile, TestTrainOnCrossing) == NULL && // empty?
-			GB(_m[tile].m5, 2, 1) != 0) { // Lights on?
-		SB(_m[tile].m5, 2, 1, 0); // Switch lights off
+			IsCrossingBarred(tile)) {
+		UnbarCrossing(tile);
 		MarkTileDirtyByTile(tile);
 	}
 }
@@ -3206,8 +3206,8 @@ static bool TrainCheckIfLineEnds(Vehicle *v)
 		if ((ts &= (ts >> 16)) == 0) {
 			// make a rail/road crossing red
 			if (IsTileType(tile, MP_STREET) && IsLevelCrossing(tile)) {
-				if (GB(_m[tile].m5, 2, 1) == 0) {
-					SB(_m[tile].m5, 2, 1, 1);
+				if (!IsCrossingBarred(tile)) {
+					BarCrossing(tile);
 					SndPlayVehicleFx(SND_0E_LEVEL_CROSSING, v);
 					MarkTileDirtyByTile(tile);
 				}