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 "tile_cmd.h"

    14

#include "landscape.h"

    15

#include "tunnel_map.h"

    16

#include "unmovable_map.h"

    17

#include "viewport_func.h"

    18

#include "command_func.h"

    19

#include "town.h"

    20

#include "variables.h"

    21

#include "bridge.h"

    22

#include "train.h"

    23

#include "water_map.h"

    24

#include "yapf/yapf.h"

    25

#include "newgrf_sound.h"

    26

#include "autoslope.h"

    27

#include "transparency.h"

    28

#include "tunnelbridge_map.h"

    29

#include "strings_func.h"

    30

#include "date_func.h"

    31

#include "functions.h"

    32

#include "vehicle_func.h"

    33

#include "sound_func.h"

    34

#include "signal_func.h"

    35

    36

#include "table/sprites.h"

    37

#include "table/strings.h"

    38

#include "table/bridge_land.h"

    39

    40

const Bridge orig_bridge[] = {

    41

/*

    42

	     year of availablity

    43

	     |  minimum length

    44

	     |  |   maximum length

    45

	     |  |   |    price

    46

	     |  |   |    |    maximum speed

    47

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

    48

	     |  |   |    |    |  |                                   |                            */

    49

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

    50

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

    51

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

    52

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

    53

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

    54

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

    55

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

    56

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

    57

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

    58

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

    59

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

    60

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

    61

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

    62

};

    63

    64

Bridge _bridge[MAX_BRIDGES];

    65

    66

    67

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

    68

 * 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,

    69

 */

    70

int CalcBridgeLenCostFactor(int x)

    71

{

    72

	int n;

    73

	int r;

    74

    75

	if (x < 2) return x;

    76

	x -= 2;

    77

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

    78

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

    79

		r += n * n;

    80

		x -= n;

    81

	}

    82

}

    83

    84

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

    85

enum BridgeFoundation {

    86

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

    87

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

    88

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

    89

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

    90

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

    91

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

    92

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

    93

};

    94

#undef M

    95

    96

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

    97

{

    98

	const Bridge *bridge = &_bridge[index];

    99

	assert(table < 7);

   100

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

   101

		return _bridge_sprite_table[index][table];

   102

	} else {

   103

		return bridge->sprite_table[table];

   104

	}

   105

}

   106

   107

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

   108

   109

   110

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

   111

 * - valid slopes without foundation

   112

 * - valid slopes with foundation

   113

 * - rest is invalid

   114

 */

   115

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

   116

static CommandCost CheckBridgeSlopeNorth(Axis axis, Slope tileh)

   117

{

   118

	uint32 valid;

   119

   120

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

   121

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

   122

   123

	valid =

   124

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

   125

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

   126

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

   127

   128

	return CMD_ERROR;

   129

}

   130

   131

static CommandCost CheckBridgeSlopeSouth(Axis axis, Slope tileh)

   132

{

   133

	uint32 valid;

   134

   135

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

   136

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

   137

   138

	valid =

   139

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

   140

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

   141

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

   142

   143

	return CMD_ERROR;

   144

}

   145

#undef M

   146

   147

   148

uint32 GetBridgeLength(TileIndex begin, TileIndex end)

   149

{

   150

	int x1 = TileX(begin);

   151

	int y1 = TileY(begin);

   152

	int x2 = TileX(end);

   153

	int y2 = TileY(end);

   154

   155

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

   156

}

   157

   158

bool CheckBridge_Stuff(byte bridge_type, uint bridge_len)

   159

{

   160

	const Bridge *b = &_bridge[bridge_type];

   161

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

   162

   163

	if (bridge_type >= MAX_BRIDGES) return false;

   164

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

   165

   166

	max = b->max_length;

   167

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

   168

   169

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

   170

}

   171

   172

/** Build a Bridge

   173

 * @param end_tile end tile

   174

 * @param flags type of operation

   175

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

   176

 * @param p2 various bitstuffed elements

   177

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

   178

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

   179

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

   180

 */

   181

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

   182

{

   183

	uint bridge_type;

   184

	RailType railtype;

   185

	RoadTypes roadtypes;

   186

	uint x;

   187

	uint y;

   188

	uint sx;

   189

	uint sy;

   190

	TileIndex tile_start;

   191

	TileIndex tile_end;

   192

	Slope tileh_start;

   193

	Slope tileh_end;

   194

	uint z_start;

   195

	uint z_end;

   196

	TileIndex tile;

   197

	TileIndexDiff delta;

   198

	uint bridge_len;

   199

	Axis direction;

   200

	CommandCost cost(EXPENSES_CONSTRUCTION);

   201

	CommandCost terraformcost, ret;

   202

	bool allow_on_slopes;

   203

	bool replace_bridge = false;

   204

	uint replaced_bridge_type;

   205

   206

	/* unpack parameters */

   207

	bridge_type = GB(p2, 0, 8);

   208

   209

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

   210

   211

	/* type of bridge */

   212

	if (HasBit(p2, 15)) {

   213

		railtype = INVALID_RAILTYPE; // road bridge

   214

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

   215

		if (!AreValidRoadTypes(roadtypes) || !HasRoadTypesAvail(_current_player, roadtypes)) return CMD_ERROR;

   216

	} else {

   217

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

   218

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

   219

		roadtypes = ROADTYPES_NONE;

   220

	}

   221

   222

	x = TileX(end_tile);

   223

	y = TileY(end_tile);

   224

	sx = TileX(p1);

   225

	sy = TileY(p1);

   226

   227

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

   228

	if (x == sx) {

   229

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

   230

		direction = AXIS_Y;

   231

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

   232

	} else if (y == sy) {

   233

		direction = AXIS_X;

   234

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

   235

	} else {

   236

		return_cmd_error(STR_500A_START_AND_END_MUST_BE_IN);

   237

	}

   238

   239

	/* set and test bridge length, availability */

   240

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

   241

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

   242

   243

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

   244

	tile_start = TileXY(x, y);

   245

	tile_end = TileXY(sx, sy);

   246

	if (IsWaterTile(tile_start) || IsWaterTile(tile_end)) {

   247

		return_cmd_error(STR_02A0_ENDS_OF_BRIDGE_MUST_BOTH);

   248

	}

   249

   250

	tileh_start = GetTileSlope(tile_start, &z_start);

   251

	tileh_end = GetTileSlope(tile_end, &z_end);

   252

   253

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

   254

	if (HasBit(BRIDGE_FULL_LEVELED_FOUNDATION, tileh_start)) z_start += TILE_HEIGHT;

   255

   256

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

   257

	if (HasBit(BRIDGE_FULL_LEVELED_FOUNDATION, tileh_end)) z_end += TILE_HEIGHT;

   258

   259

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

   260

   261

	allow_on_slopes = (!_is_old_ai_player

   262

	                   && _patches.build_on_slopes);

   263

   264

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

   265

   266

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

   267

			GetOtherBridgeEnd(tile_start) == tile_end &&

   268

			GetTunnelBridgeTransportType(tile_start) == transport_type) {

   269

		/* Replace a current bridge. */

   270

   271

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

   272

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

   273

			return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);

   274

		}

   275

   276

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

   277

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

   278

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

   279

			Town *t = ClosestTownFromTile(tile_start, UINT_MAX);

   280

   281

			if (t == NULL) {

   282

				return CMD_ERROR;

   283

			} else {

   284

				SetDParam(0, t->index);

   285

				return_cmd_error(STR_2009_LOCAL_AUTHORITY_REFUSES);

   286

			}

   287

		}

   288

   289

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

   290

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

   291

			return_cmd_error(STR_1007_ALREADY_BUILT);

   292

		}

   293

   294

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

   295

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

   296

			return_cmd_error(STR_1024_AREA_IS_OWNED_BY_ANOTHER);

   297

		}

   298

   299

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

   300

		replace_bridge = true;

   301

		replaced_bridge_type = GetBridgeType(tile_start);

   302

   303

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

   304

		roadtypes |= GetRoadTypes(tile_start);

   305

	} else {

   306

		/* Build a new bridge. */

   307

   308

		/* Try and clear the start landscape */

   309

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

   310

		if (CmdFailed(ret)) return ret;

   311

		cost = ret;

   312

   313

		terraformcost = CheckBridgeSlopeNorth(direction, tileh_start);

   314

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

   315

			return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   316

		cost.AddCost(terraformcost);

   317

   318

		/* Try and clear the end landscape */

   319

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

   320

		if (CmdFailed(ret)) return ret;

   321

		cost.AddCost(ret);

   322

   323

		/* false - end tile slope check */

   324

		terraformcost = CheckBridgeSlopeSouth(direction, tileh_end);

   325

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

   326

			return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   327

		cost.AddCost(terraformcost);

   328

	}

   329

   330

	if (!replace_bridge) {

   331

		TileIndex Heads[] = {tile_start, tile_end};

   332

		int i;

   333

   334

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

   335

			if (MayHaveBridgeAbove(Heads[i])) {

   336

				if (IsBridgeAbove(Heads[i])) {

   337

					TileIndex north_head = GetNorthernBridgeEnd(Heads[i]);

   338

   339

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

   340

   341

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

   342

						return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);

   343

					}

   344

				}

   345

			}

   346

		}

   347

	}

   348

   349

	/* do the drill? */

   350

	if (flags & DC_EXEC) {

   351

		DiagDirection dir = AxisToDiagDir(direction);

   352

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

   353

   354

		if (railtype != INVALID_RAILTYPE) {

   355

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

   356

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

   357

		} else {

   358

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

   359

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

   360

		}

   361

		MarkTileDirtyByTile(tile_start);

   362

		MarkTileDirtyByTile(tile_end);

   363

	}

   364

   365

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

   366

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

   368

   369

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

   370

			/* Disallow crossing bridges for the time being */

   371

			return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);

   372

		}

   373

   374

		switch (GetTileType(tile)) {

   375

			case MP_WATER:

   376

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

   377

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

   378

				break;

   379

   380

			case MP_RAILWAY:

   381

				if (!IsPlainRailTile(tile)) goto not_valid_below;

   382

				break;

   383

   384

			case MP_ROAD:

   385

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

   386

				break;

   387

   388

			case MP_TUNNELBRIDGE:

   389

				if (IsTunnel(tile)) break;

   390

				if (replace_bridge) break;

   391

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

   392

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

   393

				break;

   394

   395

			case MP_UNMOVABLE:

   396

				if (!IsOwnedLand(tile)) goto not_valid_below;

   397

				break;

   398

   399

			case MP_CLEAR:

   400

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

   401

				break;

   402

   403

			default:

   404

not_valid_below:;

   405

				/* try and clear the middle landscape */

   406

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

   407

				if (CmdFailed(ret)) return ret;

   408

				cost.AddCost(ret);

   409

				break;

   410

		}

   411

   412

		if (flags & DC_EXEC) {

   413

			SetBridgeMiddle(tile, direction);

   414

			MarkTileDirtyByTile(tile);

   415

		}

   416

	}

   417

   418

	if (flags & DC_EXEC && railtype != INVALID_RAILTYPE) {

   419

		Track track = AxisToTrack(direction);

   420

		AddSideToSignalBuffer(tile_start, INVALID_DIAGDIR, _current_player);

   421

		YapfNotifyTrackLayoutChange(tile_start, track);

   422

	}

   423

   424

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

   425

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

   426

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

   427

	 */

   428

	if (!(flags & DC_QUERY_COST)) {

   429

		const Bridge *b = &_bridge[bridge_type];

   430

   431

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

   432

   433

		if (IsValidPlayer(_current_player) && !_is_old_ai_player)

   434

			bridge_len = CalcBridgeLenCostFactor(bridge_len);

   435

   436

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

   437

	}

   438

   439

	return cost;

   440

}

   441

   442

   443

/** Build Tunnel.

   444

 * @param start_tile start tile of tunnel

   445

 * @param flags type of operation

   446

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

   447

 * @param p2 unused

   448

 */

   449

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

   450

{

   451

	TileIndexDiff delta;

   452

	TileIndex end_tile;

   453

	DiagDirection direction;

   454

	Slope start_tileh;

   455

	Slope end_tileh;

   456

	uint start_z;

   457

	uint end_z;

   458

	CommandCost cost(EXPENSES_CONSTRUCTION);

   459

	CommandCost ret;

   460

   461

	_build_tunnel_endtile = 0;

   462

	if (!HasBit(p1, 9)) {

   463

		if (!ValParamRailtype((RailType)p1)) return CMD_ERROR;

   464

	} else {

   465

		const RoadTypes rts = (RoadTypes)GB(p1, 0, 3);

   466

		if (!AreValidRoadTypes(rts) || !HasRoadTypesAvail(_current_player, rts)) return CMD_ERROR;

   467

	}

   468

   469

	start_tileh = GetTileSlope(start_tile, &start_z);

   470

   471

	switch (start_tileh) {

   472

		case SLOPE_SW: direction = DIAGDIR_SW; break;

   473

		case SLOPE_SE: direction = DIAGDIR_SE; break;

   474

		case SLOPE_NW: direction = DIAGDIR_NW; break;

   475

		case SLOPE_NE: direction = DIAGDIR_NE; break;

   476

		default: return_cmd_error(STR_500B_SITE_UNSUITABLE_FOR_TUNNEL);

   477

	}

   478

   479

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

   480

	if (CmdFailed(ret)) return ret;

   481

   482

	/* XXX - do NOT change 'ret' in the loop, as it is used as the price

   483

	 * for the clearing of the entrance of the tunnel. Assigning it to

   484

	 * cost before the loop will yield different costs depending on start-