1

/* $Id$ */

     2

     3

/** @file tunnelbridge_cmd.cpp

     4

 * This file deals with tunnels and bridges (non-gui stuff)

     5

 * @todo seperate this file into two

     6

 */

     7

     8

#include "stdafx.h"

     9

#include "openttd.h"

    10

#include "bridge_map.h"

    11

#include "rail_map.h"

    12

#include "road_map.h"

    13

#include "table/sprites.h"

    14

#include "table/strings.h"

    15

#include "strings.h"

    16

#include "functions.h"

    17

#include "map.h"

    18

#include "landscape.h"

    19

#include "tile.h"

    20

#include "tunnel_map.h"

    21

#include "unmovable_map.h"

    22

#include "vehicle.h"

    23

#include "viewport.h"

    24

#include "command.h"

    25

#include "player.h"

    26

#include "town.h"

    27

#include "sound.h"

    28

#include "variables.h"

    29

#include "bridge.h"

    30

#include "train.h"

    31

#include "water_map.h"

    32

#include "yapf/yapf.h"

    33

#include "date.h"

    34

#include "newgrf_sound.h"

    35

    36

#include "table/bridge_land.h"

    37

    38

const Bridge orig_bridge[] = {

    39

/*

    40

	     year of availablity

    41

	     |  minimum length

    42

	     |  |   maximum length

    43

	     |  |   |    price

    44

	     |  |   |    |    maximum speed

    45

	     |  |   |    |    |  sprite to use in GUI                string with description

    46

	     |  |   |    |    |  |                                   |                            */

    47

	{    0, 0, 16,  80,  32, 0xA24, PAL_NONE                  , STR_5012_WOODEN             , NULL, 0 },

    48

	{    0, 0,  2, 112,  48, 0xA26, PALETTE_TO_STRUCT_RED     , STR_5013_CONCRETE           , NULL, 0 },

    49

	{ 1930, 0,  5, 144,  64, 0xA25, PAL_NONE                  , STR_500F_GIRDER_STEEL       , NULL, 0 },

    50

	{    0, 2, 10, 168,  80, 0xA22, PALETTE_TO_STRUCT_CONCRETE, STR_5011_SUSPENSION_CONCRETE, NULL, 0 },

    51

	{ 1930, 3, 16, 185,  96, 0xA22, PAL_NONE                  , STR_500E_SUSPENSION_STEEL   , NULL, 0 },

    52

	{ 1930, 3, 16, 192, 112, 0xA22, PALETTE_TO_STRUCT_YELLOW  , STR_500E_SUSPENSION_STEEL   , NULL, 0 },

    53

	{ 1930, 3,  7, 224, 160, 0xA23, PAL_NONE                  , STR_5010_CANTILEVER_STEEL   , NULL, 0 },

    54

	{ 1930, 3,  8, 232, 208, 0xA23, PALETTE_TO_STRUCT_BROWN   , STR_5010_CANTILEVER_STEEL   , NULL, 0 },

    55

	{ 1930, 3,  9, 248, 240, 0xA23, PALETTE_TO_STRUCT_RED     , STR_5010_CANTILEVER_STEEL   , NULL, 0 },

    56

	{ 1930, 0,  2, 240, 256, 0xA27, PAL_NONE                  , STR_500F_GIRDER_STEEL       , NULL, 0 },

    57

	{ 1995, 2, 16, 255, 320, 0xA28, PAL_NONE                  , STR_5014_TUBULAR_STEEL      , NULL, 0 },

    58

	{ 2005, 2, 32, 380, 512, 0xA28, PALETTE_TO_STRUCT_YELLOW  , STR_5014_TUBULAR_STEEL      , NULL, 0 },

    59

	{ 2010, 2, 32, 510, 608, 0xA28, PALETTE_TO_STRUCT_GREY    , STR_BRIDGE_TUBULAR_SILICON  , NULL, 0 }

    60

};

    61

    62

Bridge _bridge[MAX_BRIDGES];

    63

    64

    65

/** calculate the price factor for building a long bridge.

    66

 * basically the cost delta is 1,1, 1, 2,2, 3,3,3, 4,4,4,4, 5,5,5,5,5, 6,6,6,6,6,6,  7,7,7,7,7,7,7,  8,8,8,8,8,8,8,8,

    67

 */

    68

int CalcBridgeLenCostFactor(int x)

    69

{

    70

	int n;

    71

	int r;

    72

    73

	if (x < 2) return x;

    74

	x -= 2;

    75

	for (n = 0, r = 2;; n++) {

    76

		if (x <= n) return r + x * n;

    77

		r += n * n;

    78

		x -= n;

    79

	}

    80

}

    81

    82

#define M(x) (1 << (x))

    83

enum BridgeFoundation {

    84

	/* foundation, whole tile is leveled up --> 3 corners raised */

    85

	BRIDGE_FULL_LEVELED_FOUNDATION = M(SLOPE_WSE) | M(SLOPE_NWS) | M(SLOPE_ENW) | M(SLOPE_SEN),

    86

	/* foundation, tile is partly leveled up --> 1 corner raised */

    87

	BRIDGE_PARTLY_LEVELED_FOUNDATION = M(SLOPE_W) | M(SLOPE_S) | M(SLOPE_E) | M(SLOPE_N),

    88

	/* no foundations (X,Y direction) */

    89

	BRIDGE_NO_FOUNDATION = M(SLOPE_FLAT) | M(SLOPE_SW) | M(SLOPE_SE) | M(SLOPE_NW) | M(SLOPE_NE),

    90

	BRIDGE_HORZ_RAMP = (BRIDGE_PARTLY_LEVELED_FOUNDATION | BRIDGE_NO_FOUNDATION) & ~M(SLOPE_FLAT)

    91

};

    92

#undef M

    93

    94

static inline const PalSpriteID *GetBridgeSpriteTable(int index, byte table)

    95

{

    96

	const Bridge *bridge = &_bridge[index];

    97

	assert(table < 7);

    98

	if (bridge->sprite_table == NULL || bridge->sprite_table[table] == NULL) {

    99

		return _bridge_sprite_table[index][table];

   100

	} else {

   101

		return bridge->sprite_table[table];

   102

	}

   103

}

   104

   105

static inline byte GetBridgeFlags(int index) { return _bridge[index].flags;}

   106

   107

   108

/** Check the slope at the bridge ramps in three easy steps:

   109

 * - valid slopes without foundation

   110

 * - valid slopes with foundation

   111

 * - rest is invalid

   112

 */

   113

#define M(x) (1 << (x))

   114

static CommandCost CheckBridgeSlopeNorth(Axis axis, Slope tileh)

   115

{

   116

	uint32 valid;

   117

   118

	valid = M(SLOPE_FLAT) | (axis == AXIS_X ? M(SLOPE_NE) : M(SLOPE_NW));

   119

	if (HASBIT(valid, tileh)) return CommandCost();

   120

   121

	valid =

   122

		BRIDGE_FULL_LEVELED_FOUNDATION | M(SLOPE_N) | M(SLOPE_STEEP_N) |

   123

		(axis == AXIS_X ? M(SLOPE_E) | M(SLOPE_STEEP_E) : M(SLOPE_W) | M(SLOPE_STEEP_W));

   124

	if (HASBIT(valid, tileh)) return CommandCost(_price.terraform);

   125

   126

	return CMD_ERROR;

   127

}

   128

   129

static CommandCost CheckBridgeSlopeSouth(Axis axis, Slope tileh)

   130

{

   131

	uint32 valid;

   132

   133

	valid = M(SLOPE_FLAT) | (axis == AXIS_X ? M(SLOPE_SW) : M(SLOPE_SE));

   134

	if (HASBIT(valid, tileh)) return CommandCost();

   135

   136

	valid =

   137

		BRIDGE_FULL_LEVELED_FOUNDATION | M(SLOPE_S) | M(SLOPE_STEEP_S) |

   138

		(axis == AXIS_X ? M(SLOPE_W) | M(SLOPE_STEEP_W) : M(SLOPE_E) | M(SLOPE_STEEP_E));

   139

	if (HASBIT(valid, tileh)) return CommandCost(_price.terraform);

   140

   141

	return CMD_ERROR;

   142

}

   143

#undef M

   144

   145

   146

uint32 GetBridgeLength(TileIndex begin, TileIndex end)

   147

{

   148

	int x1 = TileX(begin);

   149

	int y1 = TileY(begin);

   150

	int x2 = TileX(end);

   151

	int y2 = TileY(end);

   152

   153

	return abs(x2 + y2 - x1 - y1) - 1;

   154

}

   155

   156

bool CheckBridge_Stuff(byte bridge_type, uint bridge_len)

   157

{

   158

	const Bridge *b = &_bridge[bridge_type];

   159

	uint max; // max possible length of a bridge (with patch 100)

   160

   161

	if (bridge_type >= MAX_BRIDGES) return false;

   162

	if (b->avail_year > _cur_year) return false;

   163

   164

	max = b->max_length;

   165

	if (max >= 16 && _patches.longbridges) max = 100;

   166

   167

	return b->min_length <= bridge_len && bridge_len <= max;

   168

}

   169

   170

/** Build a Bridge

   171

 * @param end_tile end tile

   172

 * @param flags type of operation

   173

 * @param p1 packed start tile coords (~ dx)

   174

 * @param p2 various bitstuffed elements

   175

 * - p2 = (bit 0- 7) - bridge type (hi bh)

   176

 * - p2 = (bit 8-..) - rail type or road types.

   177

 * - p2 = (bit 15  ) - set means road bridge.

   178

 */

   179

CommandCost CmdBuildBridge(TileIndex end_tile, uint32 flags, uint32 p1, uint32 p2)

   180

{

   181

	uint bridge_type;

   182

	RailType railtype;

   183

	RoadTypes roadtypes;

   184

	uint x;

   185

	uint y;

   186

	uint sx;

   187

	uint sy;

   188

	TileIndex tile_start;

   189

	TileIndex tile_end;

   190

	Slope tileh_start;

   191

	Slope tileh_end;

   192

	uint z_start;

   193

	uint z_end;

   194

	TileIndex tile;

   195

	TileIndexDiff delta;

   196

	uint bridge_len;

   197

	Axis direction;

   198

	CommandCost cost, terraformcost, ret;

   199

	bool allow_on_slopes;

   200

	bool replace_bridge = false;

   201

	uint replaced_bridge_type;

   202

   203

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   204

   205

	/* unpack parameters */

   206

	bridge_type = GB(p2, 0, 8);

   207

   208

	if (p1 >= MapSize()) return CMD_ERROR;

   209

   210

	/* type of bridge */

   211

	if (HASBIT(p2, 15)) {

   212

		railtype = INVALID_RAILTYPE; // road bridge

   213

		roadtypes = (RoadTypes)GB(p2, 8, 3);

   214

		if (!AreValidRoadTypes(roadtypes)) return CMD_ERROR;

   215

	} else {

   216

		if (!ValParamRailtype(GB(p2, 8, 8))) return CMD_ERROR;

   217

		railtype = (RailType)GB(p2, 8, 8);

   218

		roadtypes = ROADTYPES_NONE;

   219

	}

   220

   221

	x = TileX(end_tile);

   222

	y = TileY(end_tile);

   223

	sx = TileX(p1);

   224

	sy = TileY(p1);

   225

   226

	/* check if valid, and make sure that (x,y) are smaller than (sx,sy) */

   227

	if (x == sx) {

   228

		if (y == sy) return_cmd_error(STR_5008_CANNOT_START_AND_END_ON);

   229

		direction = AXIS_Y;

   230

		if (y > sy) Swap(y, sy);

   231

	} else if (y == sy) {

   232

		direction = AXIS_X;

   233

		if (x > sx) Swap(x, sx);

   234

	} else {

   235

		return_cmd_error(STR_500A_START_AND_END_MUST_BE_IN);

   236

	}

   237

   238

	/* set and test bridge length, availability */

   239

	bridge_len = sx + sy - x - y - 1;

   240

	if (!CheckBridge_Stuff(bridge_type, bridge_len)) return_cmd_error(STR_5015_CAN_T_BUILD_BRIDGE_HERE);

   241

   242

	/* retrieve landscape height and ensure it's on land */

   243

	tile_start = TileXY(x, y);

   244

	tile_end = TileXY(sx, sy);

   245

	if (IsClearWaterTile(tile_start) || IsClearWaterTile(tile_end)) {

   246

		return_cmd_error(STR_02A0_ENDS_OF_BRIDGE_MUST_BOTH);

   247

	}

   248

   249

	tileh_start = GetTileSlope(tile_start, &z_start);

   250

	tileh_end = GetTileSlope(tile_end, &z_end);

   251

   252

	if (IsSteepSlope(tileh_start)) z_start += TILE_HEIGHT;

   253

	if (HASBIT(BRIDGE_FULL_LEVELED_FOUNDATION, tileh_start)) {

   254

		z_start += TILE_HEIGHT;

   255

		tileh_start = SLOPE_FLAT;

   256

	}

   257

   258

	if (IsSteepSlope(tileh_end)) z_end += TILE_HEIGHT;

   259

	if (HASBIT(BRIDGE_FULL_LEVELED_FOUNDATION, tileh_end)) {

   260

		z_end += TILE_HEIGHT;

   261

		tileh_end = SLOPE_FLAT;

   262

	}

   263

   264

	if (z_start != z_end) return_cmd_error(STR_5009_LEVEL_LAND_OR_WATER_REQUIRED);

   265

   266

	/* Towns are not allowed to use bridges on slopes. */

   267

	allow_on_slopes = (!_is_old_ai_player

   268

	                   && _current_player != OWNER_TOWN && _patches.build_on_slopes);

   269

   270

	TransportType transport_type = railtype == INVALID_RAILTYPE ? TRANSPORT_ROAD : TRANSPORT_RAIL;

   271

   272

	if (IsBridgeTile(tile_start) && IsBridgeTile(tile_end) &&

   273

			GetOtherBridgeEnd(tile_start) == tile_end &&

   274

			GetBridgeTransportType(tile_start) == transport_type) {

   275

		/* Replace a current bridge. */

   276

   277

		/* If this is a railway bridge, make sure the railtypes match. */

   278

		if (transport_type == TRANSPORT_RAIL && GetRailType(tile_start) != railtype) {

   279

			return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);

   280

		}

   281

   282

		/* Do not replace town bridges with lower speed bridges. */

   283

		if (!(flags & DC_QUERY_COST) && IsTileOwner(tile_start, OWNER_TOWN) &&

   284

				_bridge[bridge_type].speed < _bridge[GetBridgeType(tile_start)].speed) {

   285

			Town *t = ClosestTownFromTile(tile_start, UINT_MAX);

   286

   287

			if (t == NULL) {

   288

				return CMD_ERROR;

   289

			} else {

   290

				SetDParam(0, t->index);

   291

				return_cmd_error(STR_2009_LOCAL_AUTHORITY_REFUSES);

   292

			}

   293

		}

   294

   295

		/* Do not replace the bridge with the same bridge type. */

   296

		if (!(flags & DC_QUERY_COST) && bridge_type == GetBridgeType(tile_start)) {

   297

			return_cmd_error(STR_1007_ALREADY_BUILT);

   298

		}

   299

   300

		/* Do not allow replacing another player's bridges. */

   301

		if (!IsTileOwner(tile_start, _current_player) && !IsTileOwner(tile_start, OWNER_TOWN)) {

   302

			return_cmd_error(STR_1024_AREA_IS_OWNED_BY_ANOTHER);

   303

		}

   304

   305

		cost.AddCost((bridge_len + 1) * _price.clear_bridge); // The cost of clearing the current bridge.

   306

		replace_bridge = true;

   307

		replaced_bridge_type = GetBridgeType(tile_start);

   308

   309

		/* Do not remove road types when upgrading a bridge */

   310

		roadtypes |= GetRoadTypes(tile_start);

   311

	} else {

   312

		/* Build a new bridge. */

   313

   314

		/* Try and clear the start landscape */

   315

		ret = DoCommand(tile_start, 0, 0, flags, CMD_LANDSCAPE_CLEAR);

   316

		if (CmdFailed(ret)) return ret;

   317

		cost = ret;

   318

   319

		terraformcost = CheckBridgeSlopeNorth(direction, tileh_start);

   320

		if (CmdFailed(terraformcost) || (terraformcost.GetCost() != 0 && !allow_on_slopes))

   321

			return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   322

		cost.AddCost(terraformcost);

   323

   324

		/* Try and clear the end landscape */

   325

		ret = DoCommand(tile_end, 0, 0, flags, CMD_LANDSCAPE_CLEAR);

   326

		if (CmdFailed(ret)) return ret;

   327

		cost.AddCost(ret);

   328

   329

		/* false - end tile slope check */

   330

		terraformcost = CheckBridgeSlopeSouth(direction, tileh_end);

   331

		if (CmdFailed(terraformcost) || (terraformcost.GetCost() != 0 && !allow_on_slopes))

   332

			return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   333

		cost.AddCost(terraformcost);

   334

	}

   335

   336

	if (!replace_bridge) {

   337

		TileIndex Heads[] = {tile_start, tile_end};

   338

		int i;

   339

   340

		for (i = 0; i < 2; i++) {

   341

			if (MayHaveBridgeAbove(Heads[i])) {

   342

				if (IsBridgeAbove(Heads[i])) {

   343

					TileIndex north_head = GetNorthernBridgeEnd(Heads[i]);

   344

   345

					if (direction == GetBridgeAxis(Heads[i])) return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);

   346

   347

					if (z_start + TILE_HEIGHT == GetBridgeHeight(north_head)) {

   348

						return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);

   349

					}

   350

				}

   351

			}

   352

		}

   353

	}

   354

   355

	/* do the drill? */

   356

	if (flags & DC_EXEC) {

   357

		DiagDirection dir = AxisToDiagDir(direction);

   358

		Owner owner = (replace_bridge && IsTileOwner(tile_start, OWNER_TOWN)) ? OWNER_TOWN : _current_player;

   359

   360

		if (railtype != INVALID_RAILTYPE) {

   361

			MakeRailBridgeRamp(tile_start, owner, bridge_type, dir, railtype);

   362

			MakeRailBridgeRamp(tile_end,   owner, bridge_type, ReverseDiagDir(dir), railtype);

   363

		} else {

   364

			MakeRoadBridgeRamp(tile_start, owner, bridge_type, dir, roadtypes);

   365

			MakeRoadBridgeRamp(tile_end,   owner, bridge_type, ReverseDiagDir(dir), roadtypes);

   366

		}

   367

		MarkTileDirtyByTile(tile_start);

   368

		MarkTileDirtyByTile(tile_end);

   369

	}

   370

   371

	delta = (direction == AXIS_X ? TileDiffXY(1, 0) : TileDiffXY(0, 1));

   372

	for (tile = tile_start + delta; tile != tile_end; tile += delta) {

   373

		uint z;

   374

   375

		if (GetTileSlope(tile, &z) != SLOPE_FLAT && z >= z_start) return_cmd_error(STR_5009_LEVEL_LAND_OR_WATER_REQUIRED);

   376

   377

		if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile) && !replace_bridge) {

   378

			/* Disallow crossing bridges for the time being */

   379

			return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);

   380

		}

   381

   382

		switch (GetTileType(tile)) {

   383

			case MP_WATER:

   384

				if (!EnsureNoVehicle(tile)) return_cmd_error(STR_980E_SHIP_IN_THE_WAY);

   385

				if (!IsWater(tile) && !IsCoast(tile)) goto not_valid_below;

   386

				break;

   387

   388

			case MP_RAILWAY:

   389

				if (!IsPlainRailTile(tile)) goto not_valid_below;

   390

				break;

   391

   393

				if (GetRoadTileType(tile) == ROAD_TILE_DEPOT) goto not_valid_below;

   394

				break;

   395

   396

			case MP_TUNNELBRIDGE:

   397

				if (IsTunnel(tile)) break;

   398

				if (replace_bridge) break;

   399

				if (direction == DiagDirToAxis(GetBridgeRampDirection(tile))) goto not_valid_below;

   400

				if (z_start < GetBridgeHeight(tile)) goto not_valid_below;

   401

				break;

   402

   403

			case MP_UNMOVABLE:

   404

				if (!IsOwnedLand(tile)) goto not_valid_below;

   405

				break;

   406

   407

			case MP_CLEAR:

   408

				if (!replace_bridge && IsBridgeAbove(tile)) return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);

   409

				break;

   410

   411

			default:

   412

not_valid_below:;

   413

				/* try and clear the middle landscape */

   414

				ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);

   415

				if (CmdFailed(ret)) return ret;

   416

				cost.AddCost(ret);

   417

				break;

   418

		}

   419

   420

		if (flags & DC_EXEC) {

   421

			SetBridgeMiddle(tile, direction);

   422

			MarkTileDirtyByTile(tile);

   423

		}

   424

	}

   425

   426

	if (flags & DC_EXEC) {

   427

		Track track = AxisToTrack(direction);

   428

		SetSignalsOnBothDir(tile_start, track);

   429

		YapfNotifyTrackLayoutChange(tile_start, track);

   430

	}

   431

   432

	/* for human player that builds the bridge he gets a selection to choose from bridges (DC_QUERY_COST)

   433

	 * It's unnecessary to execute this command every time for every bridge. So it is done only

   434

	 * and cost is computed in "bridge_gui.c". For AI, Towns this has to be of course calculated

   435

	 */

   436

	if (!(flags & DC_QUERY_COST)) {

   437

		const Bridge *b = &_bridge[bridge_type];

   438

   439

		bridge_len += 2; // begin and end tiles/ramps

   440

   441

		if (IsValidPlayer(_current_player) && !_is_old_ai_player)

   442

			bridge_len = CalcBridgeLenCostFactor(bridge_len);

   443

   444

		cost.AddCost((int64)bridge_len * _price.build_bridge * b->price >> 8);

   445

	}

   446

   447

	return cost;

   448

}

   449

   450

   451

/** Build Tunnel.

   452

 * @param start_tile start tile of tunnel

   453

 * @param flags type of operation

   454

 * @param p1 railtype or roadtypes. bit 9 set means road tunnel

   455

 * @param p2 unused

   456

 */

   457

CommandCost CmdBuildTunnel(TileIndex start_tile, uint32 flags, uint32 p1, uint32 p2)

   458

{

   459

	TileIndexDiff delta;

   460

	TileIndex end_tile;

   461

	DiagDirection direction;

   462

	Slope start_tileh;

   463

	Slope end_tileh;

   464

	uint start_z;

   465

	uint end_z;

   466

	CommandCost cost;

   467

	CommandCost ret;

   468

   469

	_build_tunnel_endtile = 0;

   470

	if (!HASBIT(p1, 9)) {

   471

		if (!ValParamRailtype(p1)) return CMD_ERROR;

   472

	} else if (!AreValidRoadTypes((RoadTypes)GB(p1, 0, 3))) {

   473

		return CMD_ERROR;

   474

	}

   475

   476

	start_tileh = GetTileSlope(start_tile, &start_z);

   477

   478

	switch (start_tileh) {

   479

		case SLOPE_SW: direction = DIAGDIR_SW; break;

   480

		case SLOPE_SE: direction = DIAGDIR_SE; break;

   481

		case SLOPE_NW: direction = DIAGDIR_NW; break;

   482

		case SLOPE_NE: direction = DIAGDIR_NE; break;

   483

		default: return_cmd_error(STR_500B_SITE_UNSUITABLE_FOR_TUNNEL);

   484

	}

   485