1

#include "stdafx.h"

     2

#include "ttd.h"

     3

#include "vehicle.h"

     4

#include "viewport.h"

     5

#include "command.h"

     6

#include "pathfind.h"

     7

#include "town.h"

     8

#include "sound.h"

     9

#include "station.h"

    10

    11

void ShowTrainDepotWindow(uint tile);

    12

    13

enum { /* These values are bitmasks for the map5 byte */

    14

	RAIL_TYPE_NORMAL = 0,

    15

	RAIL_TYPE_SIGNALS = 0x40,

    16

	RAIL_TYPE_SPECIAL = 0x80, // If this bit is set, then it's not a regular track.

    17

	RAIL_TYPE_DEPOT = 0xC0,

    18

	RAIL_TYPE_MASK = 0xC0,

    19

    20

	RAIL_BIT_DIAG1 = 1,  // 0

    21

	RAIL_BIT_DIAG2 = 2,  // 1

    22

	RAIL_BIT_UPPER = 4,  // 2

    23

	RAIL_BIT_LOWER = 8,  // 3

    24

	RAIL_BIT_LEFT  = 16, // 4

    25

	RAIL_BIT_RIGHT = 32, // 5

    26

	RAIL_BIT_MASK = 0x3F,

    27

    28

	RAIL_DEPOT_TRACK_MASK = 1,

    29

	RAIL_DEPOT_DIR = 3,

    30

	RAIL_DEPOT_UNUSED_BITS = 0x3C,

    31

    35

};

    36

    37

#define IS_RAIL_DEPOT(x) (((x) & (RAIL_TYPE_DEPOT|RAIL_DEPOT_UNUSED_BITS)) == RAIL_TYPE_DEPOT)

    39

    40

/* Format of rail map5 byte.

    41

 * 00 abcdef  => Normal rail

    42

 * 01 abcdef  => Rail with signals

    43

 * 10 ??????  => Unused

    44

 * 11 ????dd  => Depot

    45

 *

    46

 * abcdef is a bitmask, which contains ones for all present tracks. Below the

    47

 * value for each track is given.

    48

 */

    49

    50

/*         4

    51

 *     ---------

    52

 *    |\       /|

    53

 *    | \    1/ |

    54

 *    |  \   /  |

    55

 *    |   \ /   |

    56

 *  16|    \    |32

    57

 *    |   / \2  |

    58

 *    |  /   \  |

    59

 *    | /     \ |

    60

 *    |/       \|

    61

 *     ---------

    62

 *         8

    63

 */

    64

    65

    66

// Constants for lower part of Map2 byte.

    67

enum RailMap2Lower4 {

    68

	RAIL_MAP2LO_GROUND_MASK = 0xF,

    69

	RAIL_GROUND_BROWN = 0,

    70

	RAIL_GROUND_GREEN = 1,

    71

	RAIL_GROUND_FENCE_NW = 2,

    72

	RAIL_GROUND_FENCE_SE = 3,

    73

	RAIL_GROUND_FENCE_SENW = 4,

    74

	RAIL_GROUND_FENCE_NE = 5,

    75

	RAIL_GROUND_FENCE_SW = 6,

    76

	RAIL_GROUND_FENCE_NESW = 7,

    77

	RAIL_GROUND_FENCE_VERT1 = 8,

    78

	RAIL_GROUND_FENCE_VERT2 = 9,

    79

	RAIL_GROUND_FENCE_HORIZ1 = 10,

    80

	RAIL_GROUND_FENCE_HORIZ2 = 11,

    81

	RAIL_GROUND_ICE_DESERT = 12,

    82

};

    83

    84

    85

/* MAP2 byte:    abcd???? => Signal On? Same coding as map3lo

    86

 * MAP3LO byte:  abcd???? => Signal Exists?

    87

 *				 a and b are for diagonals, upper and left,

    88

 *				 one for each direction. (ie a == NE->SW, b ==

    89

 *				 SW->NE, or v.v., I don't know. b and c are

    90

 *				 similar for lower and right.

    91

 * MAP2 byte:    ????abcd => Type of ground.

    92

 * MAP3LO byte:  ????abcd => Type of rail.

    93

 * MAP5:         00abcdef => rail

    94

 *               01abcdef => rail w/ signals

    95

 *               10uuuuuu => unused

    96

 *               11uuuudd => rail depot

    97

 */

    98

    99

static bool CheckTrackCombination(byte map5, byte trackbits, byte flags)

   100

{

   101

	_error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;

   102

   103

	if ((map5&RAIL_TYPE_MASK) == RAIL_TYPE_SIGNALS) {

   104

   105

		if (map5 & trackbits) {

   106

			_error_message = STR_1007_ALREADY_BUILT;

   107

			return false;

   108

		}

   109

   110

		map5 |= trackbits;

   111

		return (map5 == (RAIL_TYPE_SIGNALS|RAIL_BIT_UPPER|RAIL_BIT_LOWER) || map5 == (RAIL_TYPE_SIGNALS|RAIL_BIT_LEFT|RAIL_BIT_RIGHT));

   112

   113

	} else if ((map5&RAIL_TYPE_MASK) == RAIL_TYPE_NORMAL) {

   114

		_error_message = STR_1007_ALREADY_BUILT;

   115

		if (map5 & trackbits)

   116

			return false;

   117

   118

		// Computer players are not allowed to intersect pieces of rail.

   119

		if (!(flags&DC_NO_RAIL_OVERLAP))

   120

			return true;

   121

   122

		map5 |= trackbits;

   123

		return (map5 == (RAIL_BIT_UPPER|RAIL_BIT_LOWER) || map5 == (RAIL_BIT_LEFT|RAIL_BIT_RIGHT));

   124

	} else {

   125

		return false;

   126

	}

   127

}

   128

   129

   130

static const byte _valid_tileh_slopes[4][15] = {

   131

   132

// set of normal ones

   133

{

   134

	RAIL_BIT_DIAG1|RAIL_BIT_DIAG2|RAIL_BIT_UPPER|RAIL_BIT_LOWER|RAIL_BIT_LEFT|RAIL_BIT_RIGHT,

   135

	RAIL_BIT_RIGHT,

   136

	RAIL_BIT_UPPER,

   137

	RAIL_BIT_DIAG1,

   138

   139

	RAIL_BIT_LEFT,

   140

	0,

   141

	RAIL_BIT_DIAG2,

   142

	RAIL_BIT_LOWER,

   143

   144

	RAIL_BIT_LOWER,

   145

	RAIL_BIT_DIAG2,

   146

	0,

   147

	RAIL_BIT_LEFT,

   148

   149

	RAIL_BIT_DIAG1,

   150

	RAIL_BIT_UPPER,

   151

	RAIL_BIT_RIGHT,

   152

},

   153

   154

// allowed rail for an evenly raised platform

   155

{

   156

	0,

   157

	RAIL_BIT_LEFT,

   158

	RAIL_BIT_LOWER,

   159

	RAIL_BIT_DIAG2 | RAIL_BIT_LOWER | RAIL_BIT_LEFT,

   160

   161

	RAIL_BIT_RIGHT,

   162

	RAIL_BIT_DIAG1|RAIL_BIT_DIAG2|RAIL_BIT_UPPER|RAIL_BIT_LOWER|RAIL_BIT_LEFT|RAIL_BIT_RIGHT,

   163

	RAIL_BIT_DIAG1 | RAIL_BIT_LOWER | RAIL_BIT_RIGHT,

   164

	RAIL_BIT_DIAG1|RAIL_BIT_DIAG2|RAIL_BIT_UPPER|RAIL_BIT_LOWER|RAIL_BIT_LEFT|RAIL_BIT_RIGHT,

   165

   166

	RAIL_BIT_UPPER,

   167

	RAIL_BIT_DIAG1 | RAIL_BIT_UPPER | RAIL_BIT_LEFT,

   168

	RAIL_BIT_DIAG1|RAIL_BIT_DIAG2|RAIL_BIT_UPPER|RAIL_BIT_LOWER|RAIL_BIT_LEFT|RAIL_BIT_RIGHT,

   169

	RAIL_BIT_DIAG1|RAIL_BIT_DIAG2|RAIL_BIT_UPPER|RAIL_BIT_LOWER|RAIL_BIT_LEFT|RAIL_BIT_RIGHT,

   170

   171

	RAIL_BIT_DIAG2 | RAIL_BIT_UPPER | RAIL_BIT_RIGHT,

   172

	RAIL_BIT_DIAG1|RAIL_BIT_DIAG2|RAIL_BIT_UPPER|RAIL_BIT_LOWER|RAIL_BIT_LEFT|RAIL_BIT_RIGHT,

   173

	RAIL_BIT_DIAG1|RAIL_BIT_DIAG2|RAIL_BIT_UPPER|RAIL_BIT_LOWER|RAIL_BIT_LEFT|RAIL_BIT_RIGHT,

   174

},

   175

   176

// allowed rail on coast tile

   177

{

   178

	0,

   179

	RAIL_BIT_LEFT,

   180

	RAIL_BIT_LOWER,

   181

	RAIL_BIT_DIAG2|RAIL_BIT_LEFT|RAIL_BIT_LOWER,

   182

   183

	RAIL_BIT_RIGHT,

   184

	RAIL_BIT_DIAG1|RAIL_BIT_DIAG2|RAIL_BIT_UPPER|RAIL_BIT_LOWER|RAIL_BIT_LEFT|RAIL_BIT_RIGHT,

   185

	RAIL_BIT_DIAG1|RAIL_BIT_RIGHT|RAIL_BIT_LOWER,

   186

	RAIL_BIT_DIAG1|RAIL_BIT_DIAG2|RAIL_BIT_UPPER|RAIL_BIT_LOWER|RAIL_BIT_LEFT|RAIL_BIT_RIGHT,

   187

   188

	RAIL_BIT_UPPER,

   189

	RAIL_BIT_DIAG1|RAIL_BIT_LEFT|RAIL_BIT_UPPER,

   190

	RAIL_BIT_DIAG1|RAIL_BIT_DIAG2|RAIL_BIT_UPPER|RAIL_BIT_LOWER|RAIL_BIT_LEFT|RAIL_BIT_RIGHT,

   191

	RAIL_BIT_DIAG1|RAIL_BIT_DIAG2|RAIL_BIT_UPPER|RAIL_BIT_LOWER|RAIL_BIT_LEFT|RAIL_BIT_RIGHT,

   192

   193

	RAIL_BIT_DIAG2|RAIL_BIT_RIGHT|RAIL_BIT_UPPER,

   194

	RAIL_BIT_DIAG1|RAIL_BIT_DIAG2|RAIL_BIT_UPPER|RAIL_BIT_LOWER|RAIL_BIT_LEFT|RAIL_BIT_RIGHT,

   195

	RAIL_BIT_DIAG1|RAIL_BIT_DIAG2|RAIL_BIT_UPPER|RAIL_BIT_LOWER|RAIL_BIT_LEFT|RAIL_BIT_RIGHT,

   196

	},

   197

   198

	// valid railway crossings on slopes

   199

	{

   200

		1, 0, 0, // 0, 1, 2

   201

		0, 0, 1, // 3, 4, 5

   202

		0, 1, 0, // 6, 7, 8

   203

		0, 1, 1, // 9, 10, 11

   204

		0, 1, 1, // 12, 13, 14

   205

	}

   206

};

   207

   208

uint GetRailFoundation(uint tileh, uint bits)

   209

{

   210

	int i;

   211

   212

	if ((~_valid_tileh_slopes[0][tileh] & bits) == 0)

   213

		return 0;

   214

   215

	if ((~_valid_tileh_slopes[1][tileh] & bits) == 0)

   216

		return tileh;

   217

   218

	if ( ((i=0, tileh == 1) || (i+=2, tileh == 2) || (i+=2, tileh == 4) || (i+=2, tileh == 8)) && (bits == RAIL_BIT_DIAG1 || (i++, bits == RAIL_BIT_DIAG2)))

   219

		return i + 15;

   220

   221

	return 0;

   222

}

   223

   224

//

   225

static uint32 CheckRailSlope(int tileh, uint rail_bits, uint existing, uint tile)

   226

{

   227

	// never allow building on top of steep tiles

   228

	if (!(tileh & 0x10)) {

   229

		rail_bits |= existing;

   230

   231

		// don't allow building on the lower side of a coast

   232

		if (IS_TILETYPE(tile, MP_WATER) && ~_valid_tileh_slopes[2][tileh] & rail_bits) {

   233

			return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   234

		}

   235

   236

		// no special foundation

   237

		if ((~_valid_tileh_slopes[0][tileh] & rail_bits) == 0)

   238

			return 0;

   239

   240

		if (((~_valid_tileh_slopes[1][tileh] & rail_bits) == 0) || // whole tile is leveled up

   241

			((rail_bits == RAIL_BIT_DIAG1 || rail_bits == RAIL_BIT_DIAG2) && (tileh == 1 || tileh == 2 || tileh == 4 || tileh == 8))) { // partly up

   242

			return existing ? 0 : _price.terraform;

   243

		}

   244

	}

   245

	return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   246

}

   247

   248

/* Build a single track.

   249

 * p1 - railroad type normal/maglev

   250

 * p2 - tile direction

   251

 */

   252

   253

int32 CmdBuildSingleRail(int x, int y, uint32 flags, uint32 p1, uint32 p2)

   254

{

   255

	TileInfo ti;

   256

	int32 ret, cost = 0;

   257

	byte rail_bit = 1 << p2;

   258

	byte rail_type = (byte)(p1 & 0xF);

   259

	uint tile;

   260

	byte existing = 0;

   261

	bool need_clear = false;

   262

   263

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   264

   265

	_error_message = STR_1007_ALREADY_BUILT;

   266

   267

	FindLandscapeHeight(&ti, x, y);

   268

	tile = ti.tile;

   269

   270

	// allow building rail under bridge

   271

	if (ti.type != MP_TUNNELBRIDGE && !EnsureNoVehicle(tile))

   272

		return CMD_ERROR;

   273

   274

	if (ti.type == MP_TUNNELBRIDGE) {

   275

/* BUILD ON BRIDGE CODE */

   276

		if (!EnsureNoVehicleZ(tile, GET_TILEHEIGHT(tile)))

   277

			return CMD_ERROR;

   278

   279

		if ((ti.map5 & 0xF8) == 0xC0) {

   280

			if (ti.tileh & 0x10 || rail_bit != (byte)((ti.map5 & 1) ? 1 : 2)) goto need_clear;

   281

   282

			if (!(flags & DC_EXEC))

   283

				return _price.build_rail;

   284

   285

			_map5[tile] = (ti.map5 & 0xC7) | 0x20;

   286

			goto set_ownership;

   287

		} else if ((ti.map5 & 0xF8) == 0xE0) {

   288

			if ((_map3_lo[tile] & 0xF) != (int)p1) goto need_clear;

   289

			if (rail_bit != (byte)((ti.map5 & 1) ? 1 : 2)) goto need_clear;

   290

			return CMD_ERROR;

   291

		} else

   292

			goto need_clear;

   293

	} else if (ti.type == MP_STREET) {

   294

		byte m5;

   295

/* BUILD ON STREET CODE */

   296

		if (ti.tileh & 0x10) // very steep tile

   297

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   298

   299

		if (!_valid_tileh_slopes[3][ti.tileh]) // prevent certain slopes

   300

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   301

   302

		if (!(ti.map5 & 0xF0)) {

   303

			if ((ti.map5 & 0x0F) == 0xA) {

   304

				if (rail_bit != 2) goto need_clear;

   305

				m5 = 0x10;

   306

			} else if ((ti.map5 & 0x0F) == 0x5) {

   307

				if (rail_bit != 1) goto need_clear;

   308

				m5 = 0x18;

   309

			} else

   310

				goto need_clear;

   311

   312

			if (!(flags & DC_EXEC))

   313

				return _price.build_rail;

   314

   315

			ModifyTile(tile,

   316

				MP_SETTYPE(MP_STREET) |

   317

				MP_MAP3LO | MP_MAP3HI | MP_MAPOWNER_CURRENT | MP_MAP5,

   318

				_map_owner[tile], /* map3_lo */

   319

				p1, /* map3_hi */

   320

				m5  /* map5 */

   321

			);

   322

			goto fix_signals;

   323

		} else if (!(ti.map5 & 0xE0)) {

   324

			if (rail_bit != (byte)((ti.map5 & 8) ? 1 : 2)) goto need_clear;

   325

			return CMD_ERROR;

   326

		} else

   327

			goto need_clear;

   328

	} else if (ti.type == MP_RAILWAY) {

   329

   330

/* BUILD ON RAILWAY CODE */

   331

		if (_map_owner[tile] != _current_player || (byte)(_map3_lo[tile]&0xF) != rail_type)

   332

			goto need_clear;

   333

		if (!CheckTrackCombination(ti.map5, rail_bit, (byte)flags))

   334

			return CMD_ERROR;

   335

   336

		existing = ti.map5 & 0x3F;

   337

	} else {

   338

   339

/* DEFAULT BUILD ON CODE */

   340

need_clear:;

   341

		/* isnot_railway */

   342

		if (!(flags & DC_EXEC)) {

   343

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

   344

			if (ret == CMD_ERROR) return CMD_ERROR;

   345

			cost += ret;

   346

		}

   347

		need_clear = true;

   348

	}

   349

   350

	ret = CheckRailSlope(ti.tileh, rail_bit, existing, tile);

   351

	if (ret & 0x80000000)

   352

		return ret;

   353

	cost += ret;

   354

   355

	// the AI is not allowed to used foundationed tiles.

   356

	if (ret && (!_patches.build_on_slopes || (!_patches.ainew_active && _is_ai_player)))

   357

		return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   358

   359

	if (flags & DC_EXEC && need_clear) {

   360

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

   361

		if (ret == CMD_ERROR) return CMD_ERROR;

   362

		cost += ret;

   363

	}

   364

   365

	if (flags & DC_EXEC) {

   366

		_map_type_and_height[tile] &= 0xF;

   367

		_map_type_and_height[tile] |= MP_RAILWAY << 4;

   368

		_map5[tile] |= rail_bit;

   369

		_map2[tile] &= ~RAIL_MAP2LO_GROUND_MASK;

   370

   371

		// In case it's a tile without signals, clear the signal bits. Why?

   372

		if ((_map5[tile] & RAIL_TYPE_MASK) != RAIL_TYPE_SIGNALS)

   373

			_map2[tile] &= ~0xF0;

   374

   375

set_ownership:

   376

		_map_owner[tile] = _current_player;

   377

   378

		_map3_lo[tile] &= ~0xF;

   379

		_map3_lo[tile] |= rail_type;

   380

   381

		MarkTileDirtyByTile(tile);

   382

   383

fix_signals:

   384

		SetSignalsOnBothDir(tile, (byte)p2);

   385

	}

   386

   387

	return cost + _price.build_rail;

   388

}

   389

   390

static const byte _signals_table[] = {

   391

	0x40, 0x40, 0x40, 0x10, 0x80, 0x20, 0, 0, // direction 1

   392

	0x80, 0x80, 0x80, 0x20, 0x40, 0x10, 0, 0  // direction 2

   393

};

   394

   395

static const byte _signals_table_other[] = {

   396

	0x80, 0x80, 0x80, 0x20, 0x40, 0x10, 0, 0, // direction 1

   397

	0x40, 0x40, 0x40, 0x10, 0x80, 0x20, 0, 0  // direction 2

   398

};

   399

   400

static const byte _signals_table_both[] = {

   401

	0xC0, 0xC0, 0xC0, 0x30, 0xC0, 0x30, 0, 0,	// both directions combined

   402

	0xC0, 0xC0, 0xC0, 0x30, 0xC0, 0x30, 0, 0

   403

};

   404

   405

   406

/* Remove a single track.

   407

 * p1 - unused

   408

 * p2 - tile direction

   409

 */

   410

   411

int32 CmdRemoveSingleRail(int x, int y, uint32 flags, uint32 p1, uint32 p2)

   412

{

   413

	TileInfo ti;

   414

	byte rail_bit = 1 << p2;

   415

	byte m5;

   416

	uint tile;

   417

   418

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   419

   420

	FindLandscapeHeight(&ti, x, y);

   421

   422

	tile = ti.tile;

   423

   424

	if (!((1<<ti.type) & ((1<<MP_TUNNELBRIDGE)|(1<<MP_STREET)|(1<<MP_RAILWAY))))

   425

		return CMD_ERROR;

   426

   427

	if (_current_player != OWNER_WATER && !CheckTileOwnership(tile))

   428

		return CMD_ERROR;

   429

   430

	// allow building rail under bridge

   431

	if (ti.type != MP_TUNNELBRIDGE && !EnsureNoVehicle(tile))

   432

		return CMD_ERROR;

   433

   434

	if (ti.type == MP_TUNNELBRIDGE) {

   435

		if (!EnsureNoVehicleZ(tile, GET_TILEHEIGHT(tile)))

   436

			return CMD_ERROR;

   437

   438

		if ((ti.map5 & 0xF8) != 0xE0)

   439

			return CMD_ERROR;

   440

   441

		if ( ((ti.map5 & 1) ? 1 : 2) != rail_bit )

   442

			return CMD_ERROR;

   443

   444

		if (!(flags & DC_EXEC))

   445

			return _price.remove_rail;

   446

   447

		_map_owner[tile] = OWNER_NONE;

   448

		_map5[tile] = ti.map5 & 0xC7;

   449

	} else if (ti.type == MP_STREET) {

   450

		if (!(ti.map5 & 0xF0))

   451

			return CMD_ERROR;

   452

   453

		if (ti.map5 & 0xE0)

   454

			return CMD_ERROR;

   455

   456

		if (ti.map5 & 8) {

   457

			m5 = 5;

   458

			if (rail_bit != 1)

   459

				return CMD_ERROR;

   460

		} else {

   461

			m5 = 10;

   462

			if (rail_bit != 2)

   463

				return CMD_ERROR;

   464

		}

   465

   466

		if (!(flags & DC_EXEC))

   467

			return _price.remove_rail;

   468

   469

		_map5[tile] = m5;

   470

		_map_owner[tile] = _map3_lo[tile];

   471

		_map2[tile] = 0;

   472

	} else {

   473

		assert(ti.type == MP_RAILWAY);

   474

   475

		if (ti.map5 & RAIL_TYPE_SPECIAL)

   476

			return CMD_ERROR;

   477

   478

		if (!(ti.map5 & rail_bit))

   479

			return CMD_ERROR;

   480

   481

		// don't allow remove if there are signals on the track

   482

		if (ti.map5 & RAIL_TYPE_SIGNALS) {

   483

			if (_map3_lo[tile] & _signals_table_both[p2])

   484

				return CMD_ERROR;

   485

		}

   486

   487

		if (!(flags & DC_EXEC))

   488

			return _price.remove_rail;

   489

   490

		if ( (_map5[tile] ^= rail_bit) == 0) {

   491

			DoClearSquare(tile);

   492

			goto skip_mark_dirty;

   493

		}

   494

	}

   495

   496

	/* mark_dirty */

   497

	MarkTileDirtyByTile(tile);

   498

   499

skip_mark_dirty:;

   500

   501

	SetSignalsOnBothDir(tile, (byte)p2);

   502

   503

	return _price.remove_rail;

   504

}

   505

   506

static const struct {

   507

	int8 xinc[16];

   508

	int8 yinc[16];

   509

	byte initial[16];

   510

} _railbit = {{

   511

//  0   1   2    3   4   5

   512

	 16,  0,-16,   0, 16,  0,    0,  0,

   513

	-16,  0,  0,  16,  0,-16,    0,  0,

   514

},{

   515

	0,   16,  0,  16,  0, 16,    0,  0,

   516

	0,  -16, -16,  0,-16,  0,    0,  0,

   517

},{

   518

	5,  1, 0,4, // normal

   519

	2,  1, 8,3, // x > sx

   520

	10, 9, 0,11, // y > sy

   521

	13, 9, 8,12, // x > sx && y > sy

   522