Change: simplified water region evaluation, removed savegame data

src/genworld.cpp

@@ -35,7 +35,6 @@
 #include "string_func.h"
 #include "thread.h"
 #include "tgp.h"
-#include "pathfinder/water_regions.h"
 
 #include "safeguards.h"
 
@@ -173,8 +172,6 @@ static void _GenerateWorld()
 			}
 		}
 
-		InitializeWaterRegions();
-
 		BasePersistentStorageArray::SwitchMode(PSM_LEAVE_GAMELOOP);
 
 		ResetObjectToPlace();

src/landscape.cpp

@@ -36,6 +36,7 @@
 #include "landscape_cmd.h"
 #include "terraform_cmd.h"
 #include "station_func.h"
+#include "pathfinder/water_regions.h"
 
 #include "table/strings.h"
 #include "table/sprites.h"
@@ -538,6 +539,8 @@ void DoClearSquare(TileIndex tile)
 	MakeClear(tile, CLEAR_GRASS, _generating_world ? 3 : 0);
 	MarkTileDirtyByTile(tile);
 	if (remove) RemoveDockingTile(tile);
+
+	InvalidateWaterRegion(tile);
 }
 
 /**

src/map.cpp

@@ -13,6 +13,7 @@
 #include "water_map.h"
 #include "error_func.h"
 #include "string_func.h"
+#include "pathfinder/water_regions.h"
 
 #include "safeguards.h"
 
@@ -62,6 +63,8 @@ extern "C" _CRTIMP void __cdecl _assert(void *, void *, unsigned);
 
 	Tile::base_tiles = CallocT<Tile::TileBase>(Map::size);
 	Tile::extended_tiles = CallocT<Tile::TileExtended>(Map::size);
+
+	AllocateWaterRegions();
 }
 
 

src/object_cmd.cpp

@@ -35,6 +35,7 @@
 #include "station_func.h"
 #include "object_cmd.h"
 #include "landscape_cmd.h"
+#include "pathfinder/water_regions.h"
 
 #include "table/strings.h"
 #include "table/object_land.h"
@@ -362,6 +363,7 @@ CommandCost CmdBuildObject(DoCommandFlag flags, TileIndex tile, ObjectType type,
 
 	if (flags & DC_EXEC) {
 		BuildObject(type, tile, _current_company == OWNER_DEITY ? OWNER_NONE : _current_company, nullptr, view);
+		for (TileIndex t : ta) InvalidateWaterRegion(t);
 
 		/* Make sure the HQ starts at the right size. */
 		if (type == OBJECT_HQ) UpdateCompanyHQ(tile, hq_score);

src/pathfinder/water_regions.cpp

@@ -18,6 +18,7 @@
 #include "tunnelbridge_map.h"
 #include "follow_track.hpp"
 #include "ship.h"
+#include "debug.h"
 
 using TWaterRegionTraversabilityBits = uint16_t;
 constexpr TWaterRegionPatchLabel FIRST_REGION_LABEL = 1;
@@ -114,6 +115,7 @@ class WaterRegion
 	 */
 	void ForceUpdate()
 	{
+		Debug(map, 3, "Updating water region ({},{})", GetWaterRegionX(this->tile_area.tile), GetWaterRegionY(this->tile_area.tile));
 		this->has_cross_region_aqueducts = false;
 
 		this->tile_patch_labels.fill(INVALID_WATER_REGION_PATCH);
@@ -267,8 +269,9 @@ WaterRegionPatchDesc GetWaterRegionPatchInfo(TileIndex tile)
 void InvalidateWaterRegion(TileIndex tile)
 {
 	const int index = GetWaterRegionIndex(tile);
-	if (index > static_cast<int>(_water_regions.size())) return;
 	_water_regions[index].Invalidate();
+
+	Debug(map, 3, "Invalidated water region ({},{})", GetWaterRegionX(tile), GetWaterRegionY(tile));
 }
 
 /**
@@ -342,38 +345,19 @@ void VisitWaterRegionPatchNeighbors(const WaterRegionPatchDesc &water_region_pat
 	}
 }
 
-std::vector<WaterRegionSaveLoadInfo> GetWaterRegionSaveLoadInfo()
-{
-	std::vector<WaterRegionSaveLoadInfo> result;
-	for (WaterRegion &region : _water_regions) result.push_back({ region.IsInitialized() });
-	return result;
-}
-
-void LoadWaterRegions(const std::vector<WaterRegionSaveLoadInfo> &save_load_info)
-{
-	_water_regions.clear();
-	_water_regions.reserve(save_load_info.size());
-	TWaterRegionIndex index = 0;
-	for (const auto &loaded_region_info : save_load_info) {
-		const int region_x = index % GetWaterRegionMapSizeX();
-		const int region_y = index / GetWaterRegionMapSizeX();
-		WaterRegion &region = _water_regions.emplace_back(region_x, region_y);
-		if (loaded_region_info.initialized) region.ForceUpdate();
-		index++;
-	}
-}
-
 /**
- * Initializes all water regions. All water tiles will be scanned and interconnected water patches within regions will be identified.
+ * Allocates the appropriate amount of water regions for the current map size
  */
-void InitializeWaterRegions()
+void AllocateWaterRegions()
 {
 	_water_regions.clear();
 	_water_regions.reserve(static_cast<size_t>(GetWaterRegionMapSizeX()) * GetWaterRegionMapSizeY());
 
+	Debug(map, 2, "Allocating {} x {} water regions", GetWaterRegionMapSizeX(), GetWaterRegionMapSizeY());
+
 	for (int region_y = 0; region_y < GetWaterRegionMapSizeY(); region_y++) {
 		for (int region_x = 0; region_x < GetWaterRegionMapSizeX(); region_x++) {
-			_water_regions.emplace_back(region_x, region_y).ForceUpdate();
+			_water_regions.emplace_back(region_x, region_y);
 		}
 	}
 }

src/pathfinder/water_regions.h

@@ -60,14 +60,6 @@ void InvalidateWaterRegion(TileIndex tile);
 using TVisitWaterRegionPatchCallBack = std::function<void(const WaterRegionPatchDesc &)>;
 void VisitWaterRegionPatchNeighbors(const WaterRegionPatchDesc &water_region_patch, TVisitWaterRegionPatchCallBack &callback);
 
-void InitializeWaterRegions();
-
-struct WaterRegionSaveLoadInfo
-{
-	bool initialized;
-};
-
-std::vector<WaterRegionSaveLoadInfo> GetWaterRegionSaveLoadInfo();
-void LoadWaterRegions(const std::vector<WaterRegionSaveLoadInfo> &save_load_info);
+void AllocateWaterRegions();
 
 #endif /* WATER_REGIONS_H */

src/saveload/afterload.cpp

@@ -61,7 +61,6 @@
 #include "../timer/timer.h"
 #include "../timer/timer_game_calendar.h"
 #include "../timer/timer_game_tick.h"
-#include "../pathfinder/water_regions.h"
 
 #include "saveload_internal.h"
 
@@ -3297,8 +3296,6 @@ bool AfterLoadGame()
 		}
 	}
 
-	if (IsSavegameVersionBefore(SLV_WATER_REGIONS)) InitializeWaterRegions();
-
 	return true;
 }
 

src/saveload/saveload.h

@@ -367,6 +367,8 @@ enum SaveLoadVersion : uint16_t {
 	SLV_TIMETABLE_TICKS_TYPE,               ///< 323  PR#11435 Convert timetable current order time to ticks.
 	SLV_WATER_REGIONS,                      ///< 324  PR#10543 Water Regions for ship pathfinder.
 
+	SLV_WATER_REGION_EVAL_SIMPLIFIED,       ///< 325  PR#11750 Simplified Water Region evaluation.
+
 	SL_MAX_VERSION,                         ///< Highest possible saveload version
 };
 

src/saveload/water_regions_sl.cpp

@@ -10,45 +10,23 @@
 #include "../stdafx.h"
 
 #include "saveload.h"
-#include "pathfinder/water_regions.h"
 
 #include "../safeguards.h"
 
-static const SaveLoad _water_region_desc[] = {
-	SLE_VAR(WaterRegionSaveLoadInfo, initialized, SLE_BOOL),
-};
-
-struct WRGNChunkHandler : ChunkHandler {
-	WRGNChunkHandler() : ChunkHandler('WRGN', CH_TABLE) {}
-
-	void Save() const override
-	{
-		SlTableHeader(_water_region_desc);
+extern void SlSkipArray();
 
-		int index = 0;
-		for (WaterRegionSaveLoadInfo &region : GetWaterRegionSaveLoadInfo()) {
-			SlSetArrayIndex(index++);
-			SlObject(&region, _water_region_desc);
-		}
-	}
+/* Water Region savegame data is no longer used, but still needed for old savegames to load without errors. */
+struct WaterRegionChunkHandler : ChunkHandler {
+	WaterRegionChunkHandler() : ChunkHandler('WRGN', CH_READONLY)
+	{}
 
 	void Load() const override
 	{
-		const std::vector<SaveLoad> slt = SlTableHeader(_water_region_desc);
-
-		int index;
-
-		std::vector<WaterRegionSaveLoadInfo> loaded_info;
-		while ((index = SlIterateArray()) != -1) {
-			WaterRegionSaveLoadInfo region_info;
-			SlObject(&region_info, slt);
-			loaded_info.push_back(std::move(region_info));
-		}
-
-		LoadWaterRegions(loaded_info);
-	}
+		SlTableHeader({});
+		SlSkipArray();
+	};
 };
 
-static const WRGNChunkHandler WRGN;
+static const WaterRegionChunkHandler WRGN;
 static const ChunkHandlerRef water_region_chunk_handlers[] = { WRGN };
 extern const ChunkHandlerTable _water_region_chunk_handlers(water_region_chunk_handlers);

src/tunnelbridge_cmd.cpp

@@ -562,8 +562,6 @@ CommandCost CmdBuildBridge(DoCommandFlag flags, TileIndex tile_end, TileIndex ti
 				MakeAqueductBridgeRamp(tile_end,   owner, ReverseDiagDir(dir));
 				CheckForDockingTile(tile_start);
 				CheckForDockingTile(tile_end);
-				InvalidateWaterRegion(tile_start);
-				InvalidateWaterRegion(tile_end);
 				break;
 
 			default:

src/water_cmd.cpp

@@ -134,9 +134,6 @@ CommandCost CmdBuildShipDepot(DoCommandFlag flags, TileIndex tile, Axis axis)
 	}
 
 	if (flags & DC_EXEC) {
-		InvalidateWaterRegion(tile);
-		InvalidateWaterRegion(tile2);
-
 		Depot *depot = new Depot(tile);
 		depot->build_date = TimerGameCalendar::date;
 
@@ -247,7 +244,6 @@ void MakeWaterKeepingClass(TileIndex tile, Owner o)
 
 	/* Zero map array and terminate animation */
 	DoClearSquare(tile);
-	InvalidateWaterRegion(tile);
 
 	/* Maybe change to water */
 	switch (wc) {
@@ -345,10 +341,6 @@ static CommandCost DoBuildLock(TileIndex tile, DiagDirection dir, DoCommandFlag
 	}
 
 	if (flags & DC_EXEC) {
-		InvalidateWaterRegion(tile);
-		InvalidateWaterRegion(tile + delta);
-		InvalidateWaterRegion(tile - delta);
-
 		/* Update company infrastructure counts. */
 		Company *c = Company::GetIfValid(_current_company);
 		if (c != nullptr) {
@@ -491,8 +483,6 @@ CommandCost CmdBuildCanal(DoCommandFlag flags, TileIndex tile, TileIndex start_t
 		if (!water) cost.AddCost(ret);
 
 		if (flags & DC_EXEC) {
-			InvalidateWaterRegion(current_tile);
-
 			if (IsTileType(current_tile, MP_WATER) && IsCanal(current_tile)) {
 				Owner owner = GetTileOwner(current_tile);
 				if (Company::IsValidID(owner)) {
@@ -543,8 +533,6 @@ CommandCost CmdBuildCanal(DoCommandFlag flags, TileIndex tile, TileIndex start_t
 
 static CommandCost ClearTile_Water(TileIndex tile, DoCommandFlag flags)
 {
-	if (flags & DC_EXEC) InvalidateWaterRegion(tile);
-
 	switch (GetWaterTileType(tile)) {
 		case WATER_TILE_CLEAR: {
 			if (flags & DC_NO_WATER) return_cmd_error(STR_ERROR_CAN_T_BUILD_ON_WATER);
@@ -1175,8 +1163,6 @@ void DoFloodTile(TileIndex target)
 	}
 
 	if (flooded) {
-		InvalidateWaterRegion(target);
-
 		/* Mark surrounding canal tiles dirty too to avoid glitches */
 		MarkCanalsAndRiversAroundDirty(target);
 

src/waypoint_cmd.cpp

@@ -347,7 +347,6 @@ CommandCost CmdBuildBuoy(DoCommandFlag flags, TileIndex tile)
 		if (wp->town == nullptr) MakeDefaultName(wp);
 
 		MakeBuoy(tile, wp->index, GetWaterClass(tile));
-		InvalidateWaterRegion(tile);
 		CheckForDockingTile(tile);
 		MarkTileDirtyByTile(tile);