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-rw-r--r--src/town_cmd.cpp177
-rw-r--r--src/town_map.h20
2 files changed, 116 insertions, 81 deletions
diff --git a/src/town_cmd.cpp b/src/town_cmd.cpp
index 23606bb3f..b688d100e 100644
--- a/src/town_cmd.cpp
+++ b/src/town_cmd.cpp
@@ -117,7 +117,6 @@ enum TownGrowthResult {
};
static bool BuildTownHouse(Town *t, TileIndex tile);
-static void DoBuildTownHouse(Town *t, TileIndex tile);
static void TownDrawHouseLift(const TileInfo *ti)
{
@@ -493,7 +492,7 @@ static void TileLoop_Town(TileIndex tile)
ClearTownHouse(t, tile);
/* Rebuild with another house? */
- if (GB(r, 24, 8) >= 12) DoBuildTownHouse(t, tile);
+ if (GB(r, 24, 8) >= 12) BuildTownHouse(t, tile);
}
_current_player = OWNER_NONE;
@@ -1586,29 +1585,6 @@ bool GenerateTowns()
return true;
}
-static bool CheckBuildHouseMode(TileIndex tile, Slope tileh, int mode)
-{
- int b;
- Slope slope;
-
- static const Slope _masks[8] = {
- SLOPE_NE, SLOPE_SW, SLOPE_NW, SLOPE_SE,
- SLOPE_SW, SLOPE_NE, SLOPE_SE, SLOPE_NW,
- };
-
- slope = GetTileSlope(tile, NULL);
- if (IsSteepSlope(slope)) return false;
-
- if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return false;
-
- b = 0;
- if ((slope != SLOPE_FLAT && ~slope & _masks[mode])) b = ~b;
- if ((tileh != SLOPE_FLAT && ~tileh & _masks[mode + 4])) b = ~b;
- if (b)
- return false;
-
- return CmdSucceeded(DoCommand(tile, 0, 0, DC_EXEC | DC_AUTO | DC_NO_WATER, CMD_LANDSCAPE_CLEAR));
-}
/** Returns the bit corresponding to the town zone of the specified tile
* @param t Town on which radius is to be found
@@ -1631,32 +1607,115 @@ HouseZonesBits GetTownRadiusGroup(const Town* t, TileIndex tile)
return smallest;
}
-static bool CheckFree2x2Area(TileIndex tile)
+/**
+ * Clears tile and builds a house or house part.
+ * @param t tile index
+ * @param tid Town index
+ * @param counter of construction step
+ * @param stage of construction (used for drawing)
+ * @param type of house. Index into house specs array
+ * @param random_bits required for newgrf houses
+ * @pre house can be built here
+ */
+
+static inline void ClearMakeHouseTile(TileIndex tile, TownID tid, byte counter, byte stage, HouseID type, byte random_bits)
{
- int i;
+ CommandCost cc = DoCommand(tile, 0, 0, DC_EXEC | DC_AUTO | DC_NO_WATER, CMD_LANDSCAPE_CLEAR);
+ assert(CmdSucceeded(cc));
- static const TileIndexDiffC _tile_add[] = {
- {0 , 0 },
- {0 - 0, 1 - 0},
- {1 - 0, 0 - 1},
- {1 - 1, 1 - 0}
- };
+ MakeHouseTile(tile, tid, counter, stage, type, random_bits);
+}
- for (i = 0; i != 4; i++) {
- tile += ToTileIndexDiff(_tile_add[i]);
+/**
+ * Write house information into the map. For houses > 1 tile, all tiles are marked.
+ * @param t tile index
+ * @param tid Town index
+ * @param counter of construction step
+ * @param stage of construction (used for drawing)
+ * @param type of house. Index into house specs array
+ * @param random_bits required for newgrf houses
+ * @pre house can be built here
+ */
+static void MakeTownHouse(TileIndex t, TownID tid, byte counter, byte stage, HouseID type, byte random_bits)
+{
+ BuildingFlags size = GetHouseSpecs(type)->building_flags;
- if (GetTileSlope(tile, NULL) != SLOPE_FLAT) return false;
+ ClearMakeHouseTile(t, tid, counter, stage, type, random_bits);
+ if (size & BUILDING_2_TILES_Y) ClearMakeHouseTile(t + TileDiffXY(0, 1), tid, counter, stage, ++type, random_bits);
+ if (size & BUILDING_2_TILES_X) ClearMakeHouseTile(t + TileDiffXY(1, 0), tid, counter, stage, ++type, random_bits);
+ if (size & BUILDING_HAS_4_TILES) ClearMakeHouseTile(t + TileDiffXY(1, 1), tid, counter, stage, ++type, random_bits);
+}
- if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return false;
- if (CmdFailed(DoCommand(tile, 0, 0, DC_EXEC | DC_AUTO | DC_NO_WATER | DC_FORCETEST, CMD_LANDSCAPE_CLEAR)))
- return false;
+/**
+ * Checks if a house can be built here. Important is slope, bridge above
+ * and ability to clear the land.
+ * @param tile tile to check
+ * @param noslope are slopes (foundations) allowed?
+ * @return true iff house can be built here
+ */
+static inline bool CanBuildHouseHere(TileIndex tile, bool noslope)
+{
+ /* cannot build on these slopes... */
+ Slope slope = GetTileSlope(tile, NULL);
+ if ((noslope && slope != SLOPE_FLAT) || IsSteepSlope(slope)) return false;
+
+ /* building under a bridge? */
+ if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return false;
+
+ /* can we clear the land? */
+ return CmdSucceeded(DoCommand(tile, 0, 0, DC_AUTO | DC_NO_WATER, CMD_LANDSCAPE_CLEAR));
+}
+
+
+/**
+ * Checks if a house can be built at this tile, must have the same max z as parameter.
+ * @param tile tile to check
+ * @param z max z of this tile so more parts of a house are at the same height (with foundation)
+ * @param noslope are slopes (foundations) allowed?
+ * @return true iff house can be built here
+ * @see CanBuildHouseHere()
+ */
+static inline bool CheckBuildHouseSameZ(TileIndex tile, uint z, bool noslope)
+{
+ if (!CanBuildHouseHere(tile, noslope)) return false;
+
+ /* if building on slopes is allowed, there will be flattening foundation (to tile max z) */
+ if (GetTileMaxZ(tile) != z) return false;
+
+ return true;
+}
+
+
+/**
+ * Checks if a house of size 2x2 can be built at this tile
+ * @param tile tile, N corner
+ * @param z maximum tile z so all tile have the same max z
+ * @param noslope are slopes (foundations) allowed?
+ * @return true iff house can be built
+ * @see CheckBuildHouseSameZ()
+ */
+static bool CheckFree2x2Area(TileIndex tile, uint z, bool noslope)
+{
+ /* we need to check this tile too because we can be at different tile now */
+ if (!CheckBuildHouseSameZ(tile, z, noslope)) return false;
+
+ for (DiagDirection d = DIAGDIR_SE; d < DIAGDIR_END; d++) {
+ tile += TileOffsByDiagDir(d);
+ if (!CheckBuildHouseSameZ(tile, z, noslope)) return false;
}
return true;
}
-static void DoBuildTownHouse(Town *t, TileIndex tile)
+
+/**
+ * Tries to build a house at this tile
+ * @param t town the house will belong to
+ * @param tile where the house will be built
+ * @return false iff no house can be built at this tile
+ */
+static bool BuildTownHouse(Town *t, TileIndex tile)
{
int i;
uint bitmask;
@@ -1666,6 +1725,9 @@ static void DoBuildTownHouse(Town *t, TileIndex tile)
uint oneof = 0;
HouseSpec *hs;
+ /* no house allowed at all, bail out */
+ if (!CanBuildHouseHere(tile, false)) return false;
+
/* Above snow? */
slope = GetTileSlope(tile, &z);
@@ -1702,6 +1764,8 @@ static void DoBuildTownHouse(Town *t, TileIndex tile)
}
}
+ uint maxz = GetTileMaxZ(tile);
+
for (;;) {
if (_loaded_newgrf_features.has_newhouses) {
uint r = RandomRange(probability_max);
@@ -1742,27 +1806,30 @@ static void DoBuildTownHouse(Town *t, TileIndex tile)
if (HASBITS(t->flags12 , oneof)) continue;
/* Make sure there is no slope? */
- if (hs->building_flags & TILE_NOT_SLOPED && slope != SLOPE_FLAT) continue;
+ bool noslope = (hs->building_flags & TILE_NOT_SLOPED) != 0;
+ if (noslope && slope != SLOPE_FLAT) continue;
if (hs->building_flags & TILE_SIZE_2x2) {
- if (CheckFree2x2Area(tile) ||
- CheckFree2x2Area(tile += TileDiffXY(-1, 0)) ||
- CheckFree2x2Area(tile += TileDiffXY( 0, -1)) ||
- CheckFree2x2Area(tile += TileDiffXY( 1, 0))) {
+ if (CheckFree2x2Area(tile, maxz, noslope) ||
+ CheckFree2x2Area(tile += TileDiffXY(-1, 0), maxz, noslope) ||
+ CheckFree2x2Area(tile += TileDiffXY( 0, -1), maxz, noslope) ||
+ CheckFree2x2Area(tile += TileDiffXY( 1, 0), maxz, noslope)) {
break;
}
+ /* return to original tile */
tile += TileDiffXY(0, 1);
} else if (hs->building_flags & TILE_SIZE_2x1) {
- if (CheckBuildHouseMode(tile + TileDiffXY(1, 0), slope, 0)) break;
+ /* 'tile' is already checked above - CanBuildHouseHere() and slope test */
+ if (CheckBuildHouseSameZ(tile + TileDiffXY(1, 0), maxz, noslope)) break;
- if (CheckBuildHouseMode(tile + TileDiffXY(-1, 0), slope, 1)) {
+ if (CheckBuildHouseSameZ(tile + TileDiffXY(-1, 0), maxz, noslope)) {
tile += TileDiffXY(-1, 0);
break;
}
} else if (hs->building_flags & TILE_SIZE_1x2) {
- if (CheckBuildHouseMode(tile + TileDiffXY(0, 1), slope, 2)) break;
+ if (CheckBuildHouseSameZ(tile + TileDiffXY(0, 1), maxz, noslope)) break;
- if (CheckBuildHouseMode(tile + TileDiffXY(0, -1), slope, 3)) {
+ if (CheckBuildHouseSameZ(tile + TileDiffXY(0, -1), maxz, noslope)) {
tile += TileDiffXY(0, -1);
break;
}
@@ -1795,19 +1862,7 @@ static void DoBuildTownHouse(Town *t, TileIndex tile)
}
MakeTownHouse(tile, t->index, construction_counter, construction_stage, house, Random());
}
-}
-
-static bool BuildTownHouse(Town *t, TileIndex tile)
-{
- CommandCost r;
-
- if (IsSteepSlope(GetTileSlope(tile, NULL))) return false;
- if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return false;
-
- r = DoCommand(tile, 0, 0, DC_EXEC | DC_AUTO | DC_NO_WATER, CMD_LANDSCAPE_CLEAR);
- if (CmdFailed(r)) return false;
- DoBuildTownHouse(t, tile);
return true;
}
diff --git a/src/town_map.h b/src/town_map.h
index cd63ae983..4960522ce 100644
--- a/src/town_map.h
+++ b/src/town_map.h
@@ -211,26 +211,6 @@ static inline void MakeHouseTile(TileIndex t, TownID tid, byte counter, byte sta
}
/**
- * Helper function for MakeHouseTile.
- * It is called for each tile of a multi-tile house.
- * Parametes are the same.
- * @param t tile index
- * @param tid Town index
- * @param counter of construction step
- * @param stage of construction (used for drawing)
- * @param type of house. Index into house specs array
- * @param random_bits required for newgrf houses
- */
-static inline void MakeTownHouse(TileIndex t, TownID tid, byte counter, byte stage, HouseID type, byte random_bits)
-{
- BuildingFlags size = GetHouseSpecs(type)->building_flags;
- MakeHouseTile(t, tid, counter, stage, type, random_bits);
- if (size & BUILDING_2_TILES_Y) MakeHouseTile(t + TileDiffXY(0, 1), tid, counter, stage, ++type, random_bits);
- if (size & BUILDING_2_TILES_X) MakeHouseTile(t + TileDiffXY(1, 0), tid, counter, stage, ++type, random_bits);
- if (size & BUILDING_HAS_4_TILES) MakeHouseTile(t + TileDiffXY(1, 1), tid, counter, stage, ++type, random_bits);
-}
-
-/**
* House Construction Scheme.
* Construction counter, for buildings under construction. Incremented on every
* periodic tile processing.