From 5cd0013e5c1ccb2f8e3d61b4247d90218ee612ea Mon Sep 17 00:00:00 2001
From: smatz <smatz@openttd.org>
Date: Sat, 8 Dec 2007 21:57:24 +0000
Subject: (svn r11604) -Fix: canal tiles were not marked dirty when surrounding
 tile got flooded, causing glitches

---
 src/water_cmd.cpp | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'src')

diff --git a/src/water_cmd.cpp b/src/water_cmd.cpp
index e6d1904bb..5529b8a3c 100644
--- a/src/water_cmd.cpp
+++ b/src/water_cmd.cpp
@@ -588,6 +588,16 @@ static void AnimateTile_Water(TileIndex tile)
 	/* not used */
 }
 
+/**
+ * Marks tile dirty if it is a canal tile.
+ * Called to avoid glitches when flooding tiles next to canal tile.
+ *
+ * @param tile tile to check
+ */
+static inline void MarkTileDirtyIfCanal(TileIndex tile) {
+	if (IsTileType(tile, MP_WATER) && IsCanal(tile)) MarkTileDirtyByTile(tile);
+}
+
 /**
  * Floods neighboured floodable tiles
  *
@@ -650,6 +660,11 @@ static void TileLoopWaterHelper(TileIndex tile, const TileIndexDiffC *offs)
 		if (CmdSucceeded(DoCommand(target, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR))) {
 			MakeWater(target);
 			MarkTileDirtyByTile(target);
+			/* Mark surrounding canal tiles dirty too to avoid glitches */
+			MarkTileDirtyIfCanal(target + TileDiffXY(0, 1));
+			MarkTileDirtyIfCanal(target + TileDiffXY(1, 0));
+			MarkTileDirtyIfCanal(target + TileDiffXY(0, -1));
+			MarkTileDirtyIfCanal(target + TileDiffXY(-1, 0));
 		}
 	}
 }
-- 
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