(svn r1) Import of revision 975 of old (crashed) SVN

1 files changed, 806 insertions, 0 deletions

diff --git a/clear_cmd.c b/clear_cmd.c
new file mode 100644
index 000000000..6645b5f9c
--- /dev/null
+++ b/clear_cmd.c
@@ -0,0 +1,806 @@
+#include "stdafx.h"
+#include "ttd.h"
+#include "viewport.h"
+#include "command.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 ((GET_TILE_X(tile) == TILE_X_MAX) || (GET_TILE_Y(tile) == TILE_Y_MAX))
+		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 _map_type_and_height[tile] & 0xF;
+}
+
+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+TILE_XY(0,-1));
+	TerraformAddDirtyTile(ts, tile+TILE_XY(-1,-1));
+	TerraformAddDirtyTile(ts, tile+TILE_XY(-1,0));
+	TerraformAddDirtyTile(ts, tile);
+}
+
+static int TerraformProc(TerraformerState *ts, uint tile, int mode)
+{
+	int r;
+	int32 ret;
+
+	assert(tile < TILES_X * TILES_Y);
+	
+	if ((r=TerraformAllowTileProcess(ts, tile)) <= 0)
+		return r;
+	
+	if ((_map_type_and_height[tile] >> 4) == MP_RAILWAY) {
+		static const byte _railway_modes[4] = {8, 0x10, 4, 0x20};
+		static const byte _railway_dangslopes[4] = {0xd, 0xe, 7, 0xb};
+
+		// 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 the other corner.
+		if ((GetTileSlope(tile, NULL)&0xF) == _railway_dangslopes[mode]) {
+			_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 ((_map5[tile]&~0x40) == _railway_modes[mode])
+			return 0;
+	}
+
+	ret = DoCommandByTile(tile, 0,0, ts->flags & ~DC_EXEC, CMD_LANDSCAPE_CLEAR);
+
+	if (ret == CMD_ERROR) {
+		_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, uint tile, int height)
+{
+	int nh;
+	TerraformerHeightMod *mod;
+	int count;
+	
+	assert(tile < TILES_X * TILES_Y);
+
+	if (height < 0) {
+		_error_message = STR_1003_ALREADY_AT_SEA_LEVEL;
+		return false;
+	}
+
+	_error_message = STR_1004_TOO_HIGH;
+
+	if (height > 0xF)
+		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 + TILE_XY(0,-1), 1)<0)
+		return false;
+
+	if (TerraformProc(ts, tile + TILE_XY(-1,-1), 2)<0)
+		return false;
+
+	if (TerraformProc(ts, tile + TILE_XY(-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 == (TileIndex)tile)
+			break;
+		mod++;
+		count--;
+	}
+
+	mod->tile = (TileIndex)tile;
+	mod->height = (byte)height;
+
+	ts->cost += _price.terraform;
+
+	{
+		int direction = ts->direction, r;
+		const TileIndexDiff *ttm;
+
+		static const TileIndexDiff _terraform_tilepos[5] = {TILE_XY(1,0), TILE_XY(-2,0), TILE_XY(1,1), TILE_XY(0,-2), 0 };
+
+		for(ttm = _terraform_tilepos; *ttm != 0; ttm++) {
+			tile += *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
+ * p1 - corners
+ * p2 - direction
+ */
+
+int32 CmdTerraformLand(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+{
+	TerraformerState ts;
+	uint tile;
+	int direction;
+
+	TerraformerHeightMod modheight_data[576];
+	TileIndex tile_table_data[625];
+
+	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
+
+	_error_message = INVALID_STRING_ID;
+	_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;
+
+	tile = TILE_FROM_XY(x,y);
+
+	if (p1 & 1) {
+		if (!TerraformTileHeight(&ts, tile+TILE_XY(1,0),	
+				(_map_type_and_height[tile+TILE_XY(1,0)]&0xF) + direction))
+					return CMD_ERROR;
+	}
+
+	if (p1 & 2) {
+		if (!TerraformTileHeight(&ts, tile+TILE_XY(1,1),
+				(_map_type_and_height[tile+TILE_XY(1,1)]&0xF) + direction))
+					return CMD_ERROR;
+	}
+
+	if (p1 & 4) {
+		if (!TerraformTileHeight(&ts, tile+TILE_XY(0,1),
+				(_map_type_and_height[tile+TILE_XY(0,1)]&0xF) + direction))
+					return CMD_ERROR;
+	}
+
+	if (p1 & 8) {
+		if (!TerraformTileHeight(&ts, tile+TILE_XY(0,0),
+				(_map_type_and_height[tile+TILE_XY(0,0)]&0xF) + direction))
+					return CMD_ERROR;
+	}
+
+	if (direction == -1) {
+		/* Check if tunnel would take damage */
+		int count;
+		TileIndex *ti = ts.tile_table;
+		
+		for(count = ts.tile_table_count; count != 0; count--, ti++) {
+			uint z, t;
+			uint tile = *ti;
+
+			z = TerraformGetHeightOfTile(&ts, tile + TILE_XY(0,0));
+			t = TerraformGetHeightOfTile(&ts, tile + TILE_XY(1,0));
+			if (t <= z) z = t;
+			t = TerraformGetHeightOfTile(&ts, tile + TILE_XY(1,1));
+			if (t <= z) z = t;
+			t = TerraformGetHeightOfTile(&ts, tile + TILE_XY(0,1));
+			if (t <= z) z = t;
+
+			if (!CheckTunnelInWay(tile, z*8))
+				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++) {
+				DoCommandByTile(*ti, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+			}
+		}	
+
+		/* change the height */
+		{
+			int count;
+			TerraformerHeightMod *mod;
+			uint til;
+
+			mod = ts.modheight;
+			for(count = ts.modheight_count; count != 0; count--, mod++) {
+				til = mod->tile;
+				
+				// Change tile height
+				_map_type_and_height[til] = (_map_type_and_height[til]&~0x0F)|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;
+}
+
+
+/*
+ * p1 - start
+ */
+
+int32 CmdLevelLand(int ex, int ey, uint32 flags, uint32 p1, uint32 p2)
+{
+	int size_x, size_y;
+	int sx, sy;
+	uint h, curh;
+	uint tile;
+	int32 ret, cost, money;
+
+	// remember level height
+	h = _map_type_and_height[p1]&0xF;
+
+	ex >>= 4; ey >>= 4;
+
+	// make sure sx,sy are smaller than ex,ey
+	sx = GET_TILE_X(p1);
+	sy = GET_TILE_Y(p1);
+	if (ex < sx) intswap(ex, sx);
+	if (ey < sy) intswap(ey, sy);
+	tile = TILE_XY(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 = _map_type_and_height[tile2]&0xF;
+		while (curh != h) {
+			ret = DoCommandByTile(tile2, 8, (curh > h)?0:1, flags & ~DC_EXEC, CMD_TERRAFORM_LAND);
+			if (ret == CMD_ERROR) break;
+			cost += ret;
+
+			if (flags & DC_EXEC) {
+				if ((money -= ret) < 0) {
+					_additional_cash_required = ret;
+					return cost - ret;
+				}
+				DoCommandByTile(tile2, 8, (curh > h)?0:1, flags, CMD_TERRAFORM_LAND);
+			}
+
+			curh += (curh > h) ? -1 : 1;
+		}
+	END_TILE_LOOP(tile2, size_x, size_y, tile)
+
+	if (cost == 0) return CMD_ERROR;
+	return cost;
+}
+
+/* Purchase a land area
+ * p1 = unused
+ * p2 = unused
+ */
+
+int32 CmdPurchaseLandArea(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+{
+	uint tile;
+	int32 cost;
+	
+	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
+		
+	tile = TILE_FROM_XY(x,y);
+
+	if (!EnsureNoVehicle(tile))
+		return CMD_ERROR;
+
+	if (IS_TILETYPE(tile, MP_UNMOVABLE) &&
+			_map5[tile] == 3 &&
+			_map_owner[tile] == _current_player)
+		return_cmd_error(STR_5807_YOU_ALREADY_OWN_IT);
+
+	cost = DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
+	if (cost == CMD_ERROR)
+		return CMD_ERROR;
+
+	if (flags & DC_EXEC) {
+		ModifyTile(tile,
+			MP_SETTYPE(MP_UNMOVABLE) | MP_MAPOWNER_CURRENT | MP_MAP5,
+			3 /* map5 */
+			);
+	}
+
+	return cost + _price.purchase_land * 10;
+}
+
+
+int32 ClearTile_Clear(uint tile, byte flags) {
+	static const int32 * _clear_price_table[] = {
+			NULL,
+			&_price.clear_1, &_price.clear_1,&_price.clear_1,
+			&_price.purchase_land,&_price.purchase_land,&_price.purchase_land,&_price.purchase_land,
+			&_price.clear_2,&_price.clear_2,&_price.clear_2,&_price.clear_2,
+			&_price.clear_3,&_price.clear_3,&_price.clear_3,&_price.clear_3,
+			&_price.purchase_land,&_price.purchase_land,&_price.purchase_land,&_price.purchase_land,
+			&_price.purchase_land,&_price.purchase_land,&_price.purchase_land,&_price.purchase_land,
+			&_price.clear_2,&_price.clear_2,&_price.clear_2,&_price.clear_2,
+	};
+	const int32 *price = _clear_price_table[_map5[tile] & 0x1F];
+
+	if (flags & DC_EXEC)
+		DoClearSquare(tile);
+
+	if (price == NULL)
+		return 0;
+	return *price;
+}
+
+int32 CmdSellLandArea(int x, int y, uint32 flags, uint32 p1, uint32 p2)
+{
+	uint tile;
+	
+	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
+
+	tile = TILE_FROM_XY(x,y);
+
+	if (!CheckTileOwnership(tile))
+		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(TileInfo *ti, byte set)
+{
+	DrawGroundSprite(0xF54 + _tileh_to_sprite[ti->tileh] + set * 19);
+}
+
+void DrawHillyLandTile(TileInfo *ti)
+{
+	if (ti->tileh != 0) {
+		DrawGroundSprite(0xFA0 + _tileh_to_sprite[ti->tileh]);
+	} else {
+		DrawGroundSprite(_landscape_clear_sprites[((ti->x^ti->y) >> 4) & 0x7]);
+	}
+}
+
+void DrawClearLandFence(TileInfo *ti, byte img)
+{
+	byte z = ti->z;
+	
+	if (ti->tileh & 2) {
+		z += 8;
+		if (ti->tileh == 0x17)
+			z += 8;
+	}
+
+	if (img & 0x38) {
+		DrawGroundSpriteAt(_clear_land_fence_sprites_1[((img >> 3) & 7) - 1] + _fence_mod_by_tileh[ti->tileh], ti->x, ti->y, z);
+	}
+
+	if (img & 0x7) {
+		DrawGroundSpriteAt(_clear_land_fence_sprites_1[(img & 7) - 1] + _fence_mod_by_tileh_2[ti->tileh], ti->x, ti->y, z);
+	}
+}
+
+static void DrawTile_Clear(TileInfo *ti)
+{
+
+	switch((ti->map5 & (7<<2)) >> 2) {
+	case 0:
+		DrawClearLandTile(ti, (ti->map5 & 3));
+		break;
+
+	case 1:
+		DrawHillyLandTile(ti);
+		break;
+
+	case 2:
+		DrawGroundSprite(0xFB7 + _tileh_to_sprite[ti->tileh]);
+		break;
+
+	case 3:
+		DrawGroundSprite( _clear_land_sprites_1[_map3_lo[ti->tile]&0xF] + _tileh_to_sprite[ti->tileh]);
+		break;
+
+	case 4:
+		DrawGroundSprite( _clear_land_sprites_2[ti->map5&3] + _tileh_to_sprite[ti->tileh]);
+		break;
+
+	case 5:
+		DrawGroundSprite( _clear_land_sprites_3[ti->map5&3] + _tileh_to_sprite[ti->tileh]);
+		break;
+	}
+	
+	DrawClearLandFence(ti, _map3_hi[ti->tile] >> 2);
+}
+
+uint GetSlopeZ_Clear(TileInfo *ti) { return GetPartialZ(ti->x&0xF, ti->y&0xF, ti->tileh) + ti->z; }
+
+static void GetAcceptedCargo_Clear(uint tile, AcceptedCargo *ac)
+{
+	/* unused */	
+}
+
+static void AnimateTile_Clear(uint tile)
+{
+	/* unused */
+}
+
+void TileLoopClearHelper(uint tile)
+{
+	byte img_1, img_2;
+	static byte img_by_map5[8] = { 0,0,0,2, 1,1,0,0, };
+	uint dirty = -1;
+
+	img_1 = 0;
+	if (IS_TILETYPE(tile, MP_CLEAR)) {
+		img_1 = img_by_map5[(_map5[tile] & 0x1C) >> 2];
+	} else if (IS_TILETYPE(tile, MP_TREES) && (_map2[tile] & 0x30) == 0x20) {
+		img_1 = 1;
+	}
+
+	img_2 = 0;
+	if (IS_TILETYPE(TILE_ADDXY(tile, 1, 0), MP_CLEAR)) {
+		img_2 = img_by_map5[(_map5[TILE_ADDXY(tile, 1, 0)] & 0x1C) >> 2];
+	} else if (IS_TILETYPE(TILE_ADDXY(tile, 1, 0), MP_TREES) && (_map2[TILE_ADDXY(tile, 1, 0)] & 0x30) == 0x20) {
+		img_2 = 1;
+	}
+
+	if (!(_map3_hi[tile] & 0xE0)) {
+		if ( (img_1&2) != (img_2&2) ) {
+			_map3_hi[tile] |= 3 << 5;
+			dirty = tile;
+		} 
+	} else {
+		if (img_1 == 1 && img_2 == 1) {
+			_map3_hi[tile] &= ~(3 << 5);
+			dirty = tile;
+		}
+	}
+
+	img_2 = 0;
+	if (IS_TILETYPE(TILE_ADDXY(tile, 0, 1), MP_CLEAR)) {
+		img_2 = img_by_map5[(_map5[TILE_ADDXY(tile, 0, 1)] & 0x1C) >> 2];
+	} else if (IS_TILETYPE(TILE_ADDXY(tile, 0, 1), MP_TREES) && (_map2[TILE_ADDXY(tile, 0, 1)] & 0x30) == 0x20) {
+		img_2 = 1;
+	}
+
+	if (!(_map3_hi[tile] & 0x1C)) {
+		if ( (img_1&2) != (img_2&2) ) {
+			_map3_hi[tile] |= 3 << 2;
+			dirty = tile;
+		} 
+	} else {
+		if (img_1 == 1 && img_2 == 1) {
+			_map3_hi[tile] &= ~(3 << 2);
+			dirty = tile;
+		}
+	}
+
+	if (dirty != -1)
+		MarkTileDirtyByTile(dirty);
+}
+
+
+/* convert into snowy tiles */
+static void TileLoopClearAlps(uint tile)
+{
+	int k;
+	byte m5,tmp;
+
+	/* distance from snow line, in steps of 8 */
+	k = GetTileZ(tile) - _opt.snow_line;
+
+	m5 = _map5[tile] & 0x1C;
+	tmp = _map5[tile] & 3;
+	
+	if (k < -8) {
+		/* snow_m2_down */
+		if (m5 != 0x10)
+			return;
+		if (tmp == 0)
+			m5 = 3;
+	} else if (k == -8) {
+		/* snow_m1 */
+		if (m5 != 0x10) {
+			m5 = 0x10;
+		} else if (tmp != 0) {
+			m5 = (tmp - 1) + 0x10;
+		} else
+			return;
+	} else if (k < 8) {
+		/* snow_0 */
+		if (m5 != 0x10) {
+			m5 = 0x10;
+		} else if (tmp != 1) {
+			m5 = 1;
+			if (tmp != 0)
+				m5 = tmp - 1;
+			m5 += 0x10;
+		} else
+			return;
+	} else if (k == 8) {
+		/* snow_p1 */
+		if (m5 != 0x10) {
+			m5 = 0x10;
+		} else if (tmp != 2) {
+			m5 = 2;
+			if (tmp <= 2)
+				m5 = tmp + 1;
+			m5 += 0x10;
+		} else
+			return;
+	} else {
+		/* snow_p2_up */
+		if (m5 != 0x10) {
+			m5 = 0x10;
+		} else if (tmp != 3) {
+			m5 = tmp + 1 + 0x10;
+		} else
+			return;
+	}
+
+	_map5[tile] = m5;
+	MarkTileDirtyByTile(tile);
+}
+
+static void TileLoopClearDesert(uint tile)
+{
+ 	if ( (_map5[tile] & 0x1C) == 0x14)
+		return;
+
+	if (GetMapExtraBits(tile) == 1) {
+		_map5[tile] = 0x17;
+	} else {
+		if (GetMapExtraBits(tile+TILE_XY(1,0)) != 1 &&
+				GetMapExtraBits(tile+TILE_XY(-1,0)) != 1 &&
+				GetMapExtraBits(tile+TILE_XY(0,1)) != 1 &&
+				GetMapExtraBits(tile+TILE_XY(0,-1)) != 1)
+					return;
+		_map5[tile] = 0x15;
+	}
+
+	MarkTileDirtyByTile(tile);
+}
+
+static void TileLoop_Clear(uint tile)
+{
+	byte m5,m3;
+
+	TileLoopClearHelper(tile);
+	
+	if (_opt.landscape == LT_DESERT) {
+		TileLoopClearDesert(tile);
+	} else if (_opt.landscape == LT_HILLY) {
+		TileLoopClearAlps(tile);
+	}
+
+	m5 = _map5[tile];
+	if ( (m5 & 0x1C) == 0x10 || (m5 & 0x1C) == 0x14)
+		return;
+
+	if ( (m5 & 0x1C) != 0xC) {
+		if ( (m5 & 3) == 3)
+			return;
+		
+		if (_game_mode != GM_EDITOR) {
+			m5 += 0x20;
+			if (m5 >= 0x20) {
+				// Didn't overflow
+				_map5[tile] = m5;
+				return;
+			}
+			/* did overflow, so continue */
+		} else {
+			m5 = ((byte)Random() > 21) ? (2) : (6);
+		}
+		m5++;
+	} else if (_game_mode != GM_EDITOR) {
+		/* handle farm field */
+		m5 += 0x20;
+		if (m5 >= 0x20) {
+			// Didn't overflow
+			_map5[tile] = m5;
+			return;
+		}
+		/* overflowed */
+		m3 = _map3_lo[tile] + 1;
+		assert( (m3 & 0xF) != 0);
+		if ( (m3 & 0xF) >= 9) /* NOTE: will not work properly if m3&0xF == 0xF */
+			m3 &= ~0xF;
+		_map3_lo[tile] = m3;
+	}
+
+	_map5[tile] = m5;
+	MarkTileDirtyByTile(tile);
+}
+
+void GenerateClearTile()
+{
+	int i,j;
+	uint tile,tile_new;
+	uint32 r;
+
+	/* add hills */
+	i = (Random() & 0x3FF) | 0x400;
+	do {
+		tile = TILE_MASK(Random());	
+		if (IS_TILETYPE(tile, MP_CLEAR))
+			_map5[tile] = (byte)((_map5[tile] & ~(3<<2)) | (1<<2));
+	} while (--i);
+
+	/* add grey squares */
+	i = (Random() & 0x7F) | 0x80;
+	do {
+		r = Random();
+		tile = TILE_MASK(r);	
+		if (IS_TILETYPE(tile, MP_CLEAR)) {
+			j = ((r >> 16) & 0xF) + 5;
+			for(;;) {
+				_map5[tile] = (byte)((_map5[tile] & ~(3<<2)) | (2<<2));
+				do {
+					if (--j == 0) goto get_out;
+					tile_new = tile + _tileoffs_by_dir[Random() & 3];
+				} while (!IS_TILETYPE(tile_new, MP_CLEAR));
+				tile = tile_new;
+			}
+get_out:;
+		}
+	} while (--i);
+}
+
+static void ClickTile_Clear(uint tile)
+{
+	/* not used */
+}
+
+uint32 GetTileTrackStatus_Clear(uint tile, int mode)
+{
+	return 0;
+}
+
+static const StringID _clear_land_str[4+8-1] = {
+	STR_080B_ROUGH_LAND,
+	STR_080A_ROCKS,
+	STR_080E_FIELDS,
+	STR_080F_SNOW_COVERED_LAND,
+	STR_0810_DESERT,
+	0,
+	0,
+	STR_080C_BARE_LAND,
+	STR_080D_GRASS,
+	STR_080D_GRASS,
+	STR_080D_GRASS,
+};
+
+static void GetTileDesc_Clear(uint tile, TileDesc *td)
+{
+	int i = (_map5[tile]>>2) & 7;
+	if (i == 0)
+		i = (_map5[tile] & 3) + 8;
+	td->str = _clear_land_str[i - 1];
+	td->owner = _map_owner[tile];
+}
+
+static void ChangeTileOwner_Clear(uint tile, byte old_player, byte new_player)
+{
+	return;
+}
+
+void InitializeClearLand() {
+	_opt.snow_line = _patches.snow_line_height * 8;
+}
+
+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 */
+	NULL,											/* vehicle_leave_tile_proc */
+};