(svn r7759) -Merge: makefile rewrite. This merge features:

 - A proper ./configure, so everything needs to be configured only once, not for every make.
 - Usage of makedepend when available. This greatly reduces the time needed for generating the dependencies.
 - A generator for all project files. There is a single file with sources, which is used to generate Makefiles and the project files for MSVC.
 - Proper support for OSX universal binaries.
 - Object files for non-MSVC compiles are also placed in separate directories, making is faster to switch between debug and release compiles and it does not touch the directory with the source files.
 - Functionality to make a bundle of all needed files for for example a nightly or distribution of a binary with all needed GRFs and language files.

Note: as this merge moves almost all files, it is recommended to make a backup of your working copy before updating your working copy.

1 files changed, 803 insertions, 0 deletions

diff --git a/src/clear_cmd.c b/src/clear_cmd.c
new file mode 100644
index 000000000..4d1a78ba9
--- /dev/null
+++ b/src/clear_cmd.c
@@ -0,0 +1,803 @@
+/* $Id$ */
+
+#include "stdafx.h"
+#include "openttd.h"
+#include "clear_map.h"
+#include "rail_map.h"
+#include "table/strings.h"
+#include "functions.h"
+#include "map.h"
+#include "player.h"
+#include "tile.h"
+#include "viewport.h"
+#include "command.h"
+#include "tunnel_map.h"
+#include "bridge_map.h"
+#include "variables.h"
+#include "table/sprites.h"
+#include "unmovable_map.h"
+#include "genworld.h"
+#include "industry.h"
+
+typedef struct TerraformerHeightMod {
+	TileIndex tile;
+	byte height;
+} TerraformerHeightMod;
+
+typedef struct TerraformerState {
+	int height[4];
+	uint32 flags;
+
+	int direction;
+	int modheight_count;
+	int tile_table_count;
+
+	int32 cost;
+
+	TileIndex *tile_table;
+	TerraformerHeightMod *modheight;
+
+} TerraformerState;
+
+static int TerraformAllowTileProcess(TerraformerState *ts, TileIndex tile)
+{
+	TileIndex *t;
+	int count;
+
+	if (TileX(tile) == MapMaxX() || TileY(tile) == MapMaxY()) return -1;
+
+	t = ts->tile_table;
+	for (count = ts->tile_table_count; count != 0; count--, t++) {
+		if (*t == tile) return 0;
+	}
+
+	return 1;
+}
+
+static int TerraformGetHeightOfTile(TerraformerState *ts, TileIndex tile)
+{
+	TerraformerHeightMod *mod = ts->modheight;
+	int count;
+
+	for (count = ts->modheight_count; count != 0; count--, mod++) {
+		if (mod->tile == tile) return mod->height;
+	}
+
+	return TileHeight(tile);
+}
+
+static void TerraformAddDirtyTile(TerraformerState *ts, TileIndex tile)
+{
+	int count;
+	TileIndex *t;
+
+	count = ts->tile_table_count;
+
+	if (count >= 625) return;
+
+	for (t = ts->tile_table; count != 0; count--,t++) {
+		if (*t == tile) return;
+	}
+
+	ts->tile_table[ts->tile_table_count++] = tile;
+}
+
+static void TerraformAddDirtyTileAround(TerraformerState *ts, TileIndex tile)
+{
+	TerraformAddDirtyTile(ts, tile + TileDiffXY( 0, -1));
+	TerraformAddDirtyTile(ts, tile + TileDiffXY(-1, -1));
+	TerraformAddDirtyTile(ts, tile + TileDiffXY(-1,  0));
+	TerraformAddDirtyTile(ts, tile);
+}
+
+static int TerraformProc(TerraformerState *ts, TileIndex tile, int mode)
+{
+	int r;
+	int32 ret;
+
+	assert(tile < MapSize());
+
+	r = TerraformAllowTileProcess(ts, tile);
+	if (r <= 0) return r;
+
+	if (IsTileType(tile, MP_RAILWAY)) {
+		static const TrackBits safe_track[] = { TRACK_BIT_LOWER, TRACK_BIT_LEFT, TRACK_BIT_UPPER, TRACK_BIT_RIGHT };
+		static const Slope unsafe_slope[] = { SLOPE_S, SLOPE_W, SLOPE_N, SLOPE_E };
+
+		Slope tileh;
+		uint z;
+
+		// Nothing could be built at the steep slope - this avoids a bug
+		// when you have a single diagonal track in one corner on a
+		// basement and then you raise/lower the other corner.
+		tileh = GetTileSlope(tile, &z);
+		if (tileh == unsafe_slope[mode] ||
+				tileh == ComplementSlope(unsafe_slope[mode])) {
+			_terraform_err_tile = tile;
+			_error_message = STR_1008_MUST_REMOVE_RAILROAD_TRACK;
+			return -1;
+		}
+
+		// If we have a single diagonal track there, the other side of
+		// tile can be terraformed.
+		if (IsPlainRailTile(tile) && GetTrackBits(tile) == safe_track[mode]) {
+			/* If terraforming downwards prevent damaging a potential tunnel below.
+			 * This check is only necessary for flat tiles, because if the tile is
+			 * non-flat, then the corner opposing the rail is raised. Only this corner
+			 * can be lowered and this is a safe action
+			 */
+			if (tileh == SLOPE_FLAT &&
+					ts->direction == -1 &&
+					IsTunnelInWay(tile, z - TILE_HEIGHT)) {
+				_terraform_err_tile = tile;
+				_error_message = STR_1002_EXCAVATION_WOULD_DAMAGE;
+				return -1;
+			}
+			return 0;
+		}
+	}
+
+	ret = DoCommand(tile, 0,0, ts->flags & ~DC_EXEC, CMD_LANDSCAPE_CLEAR);
+
+	if (CmdFailed(ret)) {
+		_terraform_err_tile = tile;
+		return -1;
+	}
+
+	ts->cost += ret;
+
+	if (ts->tile_table_count >= 625) return -1;
+	ts->tile_table[ts->tile_table_count++] = tile;
+
+	return 0;
+}
+
+static bool TerraformTileHeight(TerraformerState *ts, TileIndex tile, int height)
+{
+	int nh;
+	TerraformerHeightMod *mod;
+	int count;
+
+	assert(tile < MapSize());
+
+	if (height < 0) {
+		_error_message = STR_1003_ALREADY_AT_SEA_LEVEL;
+		return false;
+	}
+
+	_error_message = STR_1004_TOO_HIGH;
+
+	if (height > 15) return false;
+
+	nh = TerraformGetHeightOfTile(ts, tile);
+	if (nh < 0 || height == nh) return false;
+
+	if (TerraformProc(ts, tile, 0) < 0) return false;
+	if (TerraformProc(ts, tile + TileDiffXY( 0, -1), 1) < 0) return false;
+	if (TerraformProc(ts, tile + TileDiffXY(-1, -1), 2) < 0) return false;
+	if (TerraformProc(ts, tile + TileDiffXY(-1,  0), 3) < 0) return false;
+
+	mod = ts->modheight;
+	count = ts->modheight_count;
+
+	for (;;) {
+		if (count == 0) {
+			if (ts->modheight_count >= 576) return false;
+			ts->modheight_count++;
+			break;
+		}
+		if (mod->tile == tile) break;
+		mod++;
+		count--;
+	}
+
+	mod->tile = tile;
+	mod->height = (byte)height;
+
+	ts->cost += _price.terraform;
+
+	{
+		int direction = ts->direction, r;
+		const TileIndexDiffC *ttm;
+
+		static const TileIndexDiffC _terraform_tilepos[] = {
+			{ 1,  0},
+			{-2,  0},
+			{ 1,  1},
+			{ 0, -2}
+		};
+
+		for (ttm = _terraform_tilepos; ttm != endof(_terraform_tilepos); ttm++) {
+			tile += ToTileIndexDiff(*ttm);
+
+			r = TerraformGetHeightOfTile(ts, tile);
+			if (r != height && r-direction != height && r+direction != height) {
+				if (!TerraformTileHeight(ts, tile, r+direction))
+					return false;
+			}
+		}
+	}
+
+	return true;
+}
+
+/** Terraform land
+ * @param tile tile to terraform
+ * @param p1 corners to terraform.
+ * @param p2 direction; eg up or down
+ */
+int32 CmdTerraformLand(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
+{
+	TerraformerState ts;
+	TileIndex t;
+	int direction;
+
+	TerraformerHeightMod modheight_data[576];
+	TileIndex tile_table_data[625];
+
+	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
+
+	_terraform_err_tile = 0;
+
+	ts.direction = direction = p2 ? 1 : -1;
+	ts.flags = flags;
+	ts.modheight_count = ts.tile_table_count = 0;
+	ts.cost = 0;
+	ts.modheight = modheight_data;
+	ts.tile_table = tile_table_data;
+
+	/* Make an extra check for map-bounds cause we add tiles to the originating tile */
+	if (tile + TileDiffXY(1, 1) >= MapSize()) return CMD_ERROR;
+
+	if (p1 & 1) {
+		t = tile + TileDiffXY(1, 0);
+		if (!TerraformTileHeight(&ts, t, TileHeight(t) + direction)) {
+			return CMD_ERROR;
+		}
+	}
+
+	if (p1 & 2) {
+		t = tile + TileDiffXY(1, 1);
+		if (!TerraformTileHeight(&ts, t, TileHeight(t) + direction)) {
+			return CMD_ERROR;
+		}
+	}
+
+	if (p1 & 4) {
+		t = tile + TileDiffXY(0, 1);
+		if (!TerraformTileHeight(&ts, t, TileHeight(t) + direction)) {
+			return CMD_ERROR;
+		}
+	}
+
+	if (p1 & 8) {
+		t = tile + TileDiffXY(0, 0);
+		if (!TerraformTileHeight(&ts, t, TileHeight(t) + direction)) {
+			return CMD_ERROR;
+		}
+	}
+
+	{
+		/* Check if tunnel would take damage */
+		int count;
+		TileIndex *ti = ts.tile_table;
+
+		for (count = ts.tile_table_count; count != 0; count--, ti++) {
+			TileIndex tile = *ti;
+
+			if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) {
+				return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);
+			}
+
+			if (direction == -1) {
+				uint z, t;
+
+				z = TerraformGetHeightOfTile(&ts, tile + TileDiffXY(0, 0));
+				t = TerraformGetHeightOfTile(&ts, tile + TileDiffXY(1, 0));
+				if (t <= z) z = t;
+				t = TerraformGetHeightOfTile(&ts, tile + TileDiffXY(1, 1));
+				if (t <= z) z = t;
+				t = TerraformGetHeightOfTile(&ts, tile + TileDiffXY(0, 1));
+				if (t <= z) z = t;
+
+				if (IsTunnelInWay(tile, z * TILE_HEIGHT)) {
+					return_cmd_error(STR_1002_EXCAVATION_WOULD_DAMAGE);
+				}
+			}
+		}
+	}
+
+	if (flags & DC_EXEC) {
+		/* Clear the landscape at the tiles */
+		{
+			int count;
+			TileIndex *ti = ts.tile_table;
+			for (count = ts.tile_table_count; count != 0; count--, ti++) {
+				DoCommand(*ti, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+			}
+		}
+
+		/* change the height */
+		{
+			int count;
+			TerraformerHeightMod *mod;
+
+			mod = ts.modheight;
+			for (count = ts.modheight_count; count != 0; count--, mod++) {
+				TileIndex til = mod->tile;
+
+				SetTileHeight(til, mod->height);
+				TerraformAddDirtyTileAround(&ts, til);
+			}
+		}
+
+		/* finally mark the dirty tiles dirty */
+		{
+			int count;
+			TileIndex *ti = ts.tile_table;
+			for (count = ts.tile_table_count; count != 0; count--, ti++) {
+				MarkTileDirtyByTile(*ti);
+			}
+		}
+	}
+	return ts.cost;
+}
+
+
+/** Levels a selected (rectangle) area of land
+ * @param tile end tile of area-drag
+ * @param p1 start tile of area drag
+ * @param p2 unused
+ */
+int32 CmdLevelLand(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
+{
+	int size_x, size_y;
+	int ex;
+	int ey;
+	int sx, sy;
+	uint h, curh;
+	int32 ret, cost, money;
+
+	if (p1 >= MapSize()) return CMD_ERROR;
+
+	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
+
+	// remember level height
+	h = TileHeight(p1);
+
+	// make sure sx,sy are smaller than ex,ey
+	ex = TileX(tile);
+	ey = TileY(tile);
+	sx = TileX(p1);
+	sy = TileY(p1);
+	if (ex < sx) intswap(ex, sx);
+	if (ey < sy) intswap(ey, sy);
+	tile = TileXY(sx, sy);
+
+	size_x = ex-sx+1;
+	size_y = ey-sy+1;
+
+	money = GetAvailableMoneyForCommand();
+	cost = 0;
+
+	BEGIN_TILE_LOOP(tile2, size_x, size_y, tile) {
+		curh = TileHeight(tile2);
+		while (curh != h) {
+			ret = DoCommand(tile2, 8, (curh > h) ? 0 : 1, flags & ~DC_EXEC, CMD_TERRAFORM_LAND);
+			if (CmdFailed(ret)) break;
+			cost += ret;
+
+			if (flags & DC_EXEC) {
+				if ((money -= ret) < 0) {
+					_additional_cash_required = ret;
+					return cost - ret;
+				}
+				DoCommand(tile2, 8, (curh > h) ? 0 : 1, flags, CMD_TERRAFORM_LAND);
+			}
+
+			curh += (curh > h) ? -1 : 1;
+		}
+	} END_TILE_LOOP(tile2, size_x, size_y, tile)
+
+	return (cost == 0) ? CMD_ERROR : cost;
+}
+
+/** Purchase a land area. Actually you only purchase one tile, so
+ * the name is a bit confusing ;p
+ * @param tile the tile the player is purchasing
+ * @param p1 unused
+ * @param p2 unused
+ */
+int32 CmdPurchaseLandArea(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
+{
+	int32 cost;
+
+	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
+
+	if (!EnsureNoVehicle(tile)) return CMD_ERROR;
+
+	if (IsOwnedLandTile(tile) && IsTileOwner(tile, _current_player)) {
+		return_cmd_error(STR_5807_YOU_ALREADY_OWN_IT);
+	}
+
+	cost = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+	if (CmdFailed(cost)) return CMD_ERROR;
+
+	if (flags & DC_EXEC) {
+		MakeOwnedLand(tile, _current_player);
+		MarkTileDirtyByTile(tile);
+	}
+
+	return cost + _price.purchase_land * 10;
+}
+
+
+static int32 ClearTile_Clear(TileIndex tile, byte flags)
+{
+	static const int32* clear_price_table[] = {
+		&_price.clear_1,
+		&_price.purchase_land,
+		&_price.clear_2,
+		&_price.clear_3,
+		&_price.purchase_land,
+		&_price.purchase_land,
+		&_price.clear_2, // XXX unused?
+	};
+	int32 price;
+
+	if (IsClearGround(tile, CLEAR_GRASS) && GetClearDensity(tile) == 0) {
+		price = 0;
+	} else {
+		price = *clear_price_table[GetClearGround(tile)];
+	}
+
+	if (flags & DC_EXEC) DoClearSquare(tile);
+
+	return price;
+}
+
+/** Sell a land area. Actually you only sell one tile, so
+ * the name is a bit confusing ;p
+ * @param tile the tile the player is selling
+ * @param p1 unused
+ * @param p2 unused
+ */
+int32 CmdSellLandArea(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
+{
+	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
+
+	if (!IsOwnedLandTile(tile)) return CMD_ERROR;
+	if (!CheckTileOwnership(tile) && _current_player != OWNER_WATER) return CMD_ERROR;
+
+
+	if (!EnsureNoVehicle(tile)) return CMD_ERROR;
+
+	if (flags & DC_EXEC) DoClearSquare(tile);
+
+	return - _price.purchase_land * 2;
+}
+
+
+#include "table/clear_land.h"
+
+
+void DrawClearLandTile(const TileInfo *ti, byte set)
+{
+	DrawGroundSprite(SPR_FLAT_BARE_LAND + _tileh_to_sprite[ti->tileh] + set * 19);
+}
+
+void DrawHillyLandTile(const TileInfo *ti)
+{
+	if (ti->tileh != SLOPE_FLAT) {
+		DrawGroundSprite(SPR_FLAT_ROUGH_LAND + _tileh_to_sprite[ti->tileh]);
+	} else {
+		DrawGroundSprite(_landscape_clear_sprites[GB(ti->x ^ ti->y, 4, 3)]);
+	}
+}
+
+void DrawClearLandFence(const TileInfo *ti)
+{
+	byte z = ti->z;
+
+	if (ti->tileh & SLOPE_S) {
+		z += TILE_HEIGHT;
+		if (ti->tileh == SLOPE_STEEP_S) z += TILE_HEIGHT;
+	}
+
+	if (GetFenceSW(ti->tile) != 0) {
+		DrawGroundSpriteAt(_clear_land_fence_sprites_1[GetFenceSW(ti->tile) - 1] + _fence_mod_by_tileh[ti->tileh], ti->x, ti->y, z);
+	}
+
+	if (GetFenceSE(ti->tile) != 0) {
+		DrawGroundSpriteAt(_clear_land_fence_sprites_1[GetFenceSE(ti->tile) - 1] + _fence_mod_by_tileh_2[ti->tileh], ti->x, ti->y, z);
+	}
+}
+
+static void DrawTile_Clear(TileInfo *ti)
+{
+	switch (GetClearGround(ti->tile)) {
+		case CLEAR_GRASS:
+			DrawClearLandTile(ti, GetClearDensity(ti->tile));
+			break;
+
+		case CLEAR_ROUGH:
+			DrawHillyLandTile(ti);
+			break;
+
+		case CLEAR_ROCKS:
+			DrawGroundSprite(SPR_FLAT_ROCKY_LAND_1 + _tileh_to_sprite[ti->tileh]);
+			break;
+
+		case CLEAR_FIELDS:
+			DrawGroundSprite(_clear_land_sprites_1[GetFieldType(ti->tile)] + _tileh_to_sprite[ti->tileh]);
+			break;
+
+		case CLEAR_SNOW:
+			DrawGroundSprite(_clear_land_sprites_2[GetClearDensity(ti->tile)] + _tileh_to_sprite[ti->tileh]);
+			break;
+
+		case CLEAR_DESERT:
+			DrawGroundSprite(_clear_land_sprites_3[GetClearDensity(ti->tile)] + _tileh_to_sprite[ti->tileh]);
+			break;
+	}
+
+	DrawClearLandFence(ti);
+	DrawBridgeMiddle(ti);
+}
+
+static uint GetSlopeZ_Clear(TileIndex tile, uint x, uint y)
+{
+	uint z;
+	uint tileh = GetTileSlope(tile, &z);
+
+	return z + GetPartialZ(x & 0xF, y & 0xF, tileh);
+}
+
+static Slope GetSlopeTileh_Clear(TileIndex tile, Slope tileh)
+{
+	return tileh;
+}
+
+static void GetAcceptedCargo_Clear(TileIndex tile, AcceptedCargo ac)
+{
+	/* unused */
+}
+
+static void AnimateTile_Clear(TileIndex tile)
+{
+	/* unused */
+}
+
+void TileLoopClearHelper(TileIndex tile)
+{
+	byte self;
+	byte neighbour;
+	TileIndex dirty = INVALID_TILE;
+
+	self = (IsTileType(tile, MP_CLEAR) && IsClearGround(tile, CLEAR_FIELDS));
+
+	neighbour = (IsTileType(TILE_ADDXY(tile, 1, 0), MP_CLEAR) && IsClearGround(TILE_ADDXY(tile, 1, 0), CLEAR_FIELDS));
+	if (GetFenceSW(tile) == 0) {
+		if (self != neighbour) {
+			SetFenceSW(tile, 3);
+			dirty = tile;
+		}
+	} else {
+		if (self == 0 && neighbour == 0) {
+			SetFenceSW(tile, 0);
+			dirty = tile;
+		}
+	}
+
+	neighbour = (IsTileType(TILE_ADDXY(tile, 0, 1), MP_CLEAR) && IsClearGround(TILE_ADDXY(tile, 0, 1), CLEAR_FIELDS));
+	if (GetFenceSE(tile) == 0) {
+		if (self != neighbour) {
+			SetFenceSE(tile, 3);
+			dirty = tile;
+		}
+	} else {
+		if (self == 0 && neighbour == 0) {
+			SetFenceSE(tile, 0);
+			dirty = tile;
+		}
+	}
+
+	if (dirty != INVALID_TILE) MarkTileDirtyByTile(dirty);
+}
+
+
+/* convert into snowy tiles */
+static void TileLoopClearAlps(TileIndex tile)
+{
+	int k = GetTileZ(tile) - _opt.snow_line + TILE_HEIGHT;
+
+	if (k < 0) { // well below the snow line
+		if (!IsClearGround(tile, CLEAR_SNOW)) return;
+		if (GetClearDensity(tile) == 0) SetClearGroundDensity(tile, CLEAR_GRASS, 3);
+	} else {
+		if (!IsClearGround(tile, CLEAR_SNOW)) {
+			SetClearGroundDensity(tile, CLEAR_SNOW, 0);
+		} else {
+			uint density = min((uint)k / TILE_HEIGHT, 3);
+
+			if (GetClearDensity(tile) < density) {
+				AddClearDensity(tile, 1);
+			} else if (GetClearDensity(tile) > density) {
+				AddClearDensity(tile, -1);
+			} else {
+				return;
+			}
+		}
+	}
+
+	MarkTileDirtyByTile(tile);
+}
+
+static void TileLoopClearDesert(TileIndex tile)
+{
+	if (IsClearGround(tile, CLEAR_DESERT)) return;
+
+	if (GetTropicZone(tile) == TROPICZONE_DESERT) {
+		SetClearGroundDensity(tile, CLEAR_DESERT, 3);
+	} else {
+		if (GetTropicZone(tile + TileDiffXY( 1,  0)) != TROPICZONE_DESERT &&
+				GetTropicZone(tile + TileDiffXY(-1,  0)) != TROPICZONE_DESERT &&
+				GetTropicZone(tile + TileDiffXY( 0,  1)) != TROPICZONE_DESERT &&
+				GetTropicZone(tile + TileDiffXY( 0, -1)) != TROPICZONE_DESERT)
+			return;
+		SetClearGroundDensity(tile, CLEAR_DESERT, 1);
+	}
+
+	MarkTileDirtyByTile(tile);
+}
+
+static void TileLoop_Clear(TileIndex tile)
+{
+	TileLoopClearHelper(tile);
+
+	switch (_opt.landscape) {
+		case LT_DESERT: TileLoopClearDesert(tile); break;
+		case LT_HILLY:  TileLoopClearAlps(tile);   break;
+	}
+
+	switch (GetClearGround(tile)) {
+		case CLEAR_GRASS:
+			if (GetClearDensity(tile) == 3) return;
+
+			if (_game_mode != GM_EDITOR) {
+				if (GetClearCounter(tile) < 7) {
+					AddClearCounter(tile, 1);
+					return;
+				} else {
+					SetClearCounter(tile, 0);
+					AddClearDensity(tile, 1);
+				}
+			} else {
+				SetClearGroundDensity(tile, GB(Random(), 0, 8) > 21 ? CLEAR_GRASS : CLEAR_ROUGH, 3);
+			}
+			break;
+
+		case CLEAR_FIELDS: {
+			uint field_type;
+
+			if (_game_mode == GM_EDITOR) return;
+
+			if (GetClearCounter(tile) < 7) {
+				AddClearCounter(tile, 1);
+				return;
+			} else {
+				SetClearCounter(tile, 0);
+			}
+
+			if (GetIndustryIndexOfField(tile) == INVALID_INDUSTRY && GetFieldType(tile) >= 7) {
+				/* This farmfield is no longer farmfield, so make it grass again */
+				MakeClear(tile, CLEAR_GRASS, 2);
+			} else {
+				field_type = GetFieldType(tile);
+				field_type = (field_type < 8) ? field_type + 1 : 0;
+				SetFieldType(tile, field_type);
+			}
+			break;
+		}
+
+		default:
+			return;
+	}
+
+	MarkTileDirtyByTile(tile);
+}
+
+void GenerateClearTile(void)
+{
+	uint i, gi;
+	TileIndex tile;
+
+	/* add rough tiles */
+	i = ScaleByMapSize(GB(Random(), 0, 10) + 0x400);
+	gi = ScaleByMapSize(GB(Random(), 0, 7) + 0x80);
+
+	SetGeneratingWorldProgress(GWP_ROUGH_ROCKY, gi + i);
+	do {
+		IncreaseGeneratingWorldProgress(GWP_ROUGH_ROCKY);
+		tile = RandomTile();
+		if (IsTileType(tile, MP_CLEAR) && !IsClearGround(tile, CLEAR_DESERT)) SetClearGroundDensity(tile, CLEAR_ROUGH, 3);
+	} while (--i);
+
+	/* add rocky tiles */
+	i = gi;
+	do {
+		uint32 r = Random();
+		tile = RandomTileSeed(r);
+
+		IncreaseGeneratingWorldProgress(GWP_ROUGH_ROCKY);
+		if (IsTileType(tile, MP_CLEAR) && !IsClearGround(tile, CLEAR_DESERT)) {
+			uint j = GB(r, 16, 4) + 5;
+			for (;;) {
+				TileIndex tile_new;
+
+				SetClearGroundDensity(tile, CLEAR_ROCKS, 3);
+				do {
+					if (--j == 0) goto get_out;
+					tile_new = tile + TileOffsByDiagDir(GB(Random(), 0, 2));
+				} while (!IsTileType(tile_new, MP_CLEAR) || IsClearGround(tile_new, CLEAR_DESERT));
+				tile = tile_new;
+			}
+get_out:;
+		}
+	} while (--i);
+}
+
+static void ClickTile_Clear(TileIndex tile)
+{
+	/* not used */
+}
+
+static uint32 GetTileTrackStatus_Clear(TileIndex tile, TransportType mode)
+{
+	return 0;
+}
+
+static const StringID _clear_land_str[] = {
+	STR_080D_GRASS,
+	STR_080B_ROUGH_LAND,
+	STR_080A_ROCKS,
+	STR_080E_FIELDS,
+	STR_080F_SNOW_COVERED_LAND,
+	STR_0810_DESERT
+};
+
+static void GetTileDesc_Clear(TileIndex tile, TileDesc *td)
+{
+	if (IsClearGround(tile, CLEAR_GRASS) && GetClearDensity(tile) == 0) {
+		td->str = STR_080C_BARE_LAND;
+	} else {
+		td->str = _clear_land_str[GetClearGround(tile)];
+	}
+	td->owner = GetTileOwner(tile);
+}
+
+static void ChangeTileOwner_Clear(TileIndex tile, PlayerID old_player, PlayerID new_player)
+{
+	return;
+}
+
+void InitializeClearLand(void)
+{
+	_opt.snow_line = _patches.snow_line_height * TILE_HEIGHT;
+}
+
+const TileTypeProcs _tile_type_clear_procs = {
+	DrawTile_Clear,           /* draw_tile_proc */
+	GetSlopeZ_Clear,          /* get_slope_z_proc */
+	ClearTile_Clear,          /* clear_tile_proc */
+	GetAcceptedCargo_Clear,   /* get_accepted_cargo_proc */
+	GetTileDesc_Clear,        /* get_tile_desc_proc */
+	GetTileTrackStatus_Clear, /* get_tile_track_status_proc */
+	ClickTile_Clear,          /* click_tile_proc */
+	AnimateTile_Clear,        /* animate_tile_proc */
+	TileLoop_Clear,           /* tile_loop_clear */
+	ChangeTileOwner_Clear,    /* change_tile_owner_clear */
+	NULL,                     /* get_produced_cargo_proc */
+	NULL,                     /* vehicle_enter_tile_proc */
+	GetSlopeTileh_Clear,      /* get_slope_tileh_proc */
+};