1

#include "stdafx.h"

     2

#include "ttd.h"

     4

#include "table/strings.h"

     5

#include "gfx.h"

     6

#include "map.h"

     7

#include "tile.h"

     8

#include "vehicle.h"

     9

#include "viewport.h"

    10

#include "command.h"

    11

#include "pathfind.h"

    12

#include "town.h"

    13

#include "sound.h"

    14

#include "station.h"

    15

#include "sprite.h"

    16

#include "depot.h"

    17

    18

extern uint16 _custom_sprites_base;

    19

    20

void ShowTrainDepotWindow(uint tile);

    21

    22

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

    23

	RAIL_TYPE_NORMAL = 0,

    24

	RAIL_TYPE_SIGNALS = 0x40,

    25

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

    26

	RAIL_TYPE_DEPOT = 0xC0,

    27

	RAIL_TYPE_MASK = 0xC0,

    28

    29

	RAIL_BIT_DIAG1 = 1,  // 0

    30

	RAIL_BIT_DIAG2 = 2,  // 1

    31

	RAIL_BIT_UPPER = 4,  // 2

    32

	RAIL_BIT_LOWER = 8,  // 3

    33

	RAIL_BIT_LEFT  = 16, // 4

    34

	RAIL_BIT_RIGHT = 32, // 5

    35

	RAIL_BIT_MASK = 0x3F,

    36

    37

	RAIL_DEPOT_TRACK_MASK = 1,

    38

	RAIL_DEPOT_DIR = 3,

    39

	RAIL_DEPOT_UNUSED_BITS = 0x3C,

    40

    41

	RAIL_TYPE_WAYPOINT = 0xC4,

    42

	RAIL_WAYPOINT_TRACK_MASK = 1,

    43

	RAIL_WAYPOINT_UNUSED_BITS = 0x3E,

    44

};

    45

    46

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

    47

#define IS_RAIL_WAYPOINT(x) (((x) & (RAIL_TYPE_WAYPOINT|RAIL_WAYPOINT_UNUSED_BITS)) == RAIL_TYPE_WAYPOINT)

    48

    49

/* Format of rail map5 byte.

    50

 * 00 abcdef  => Normal rail

    51

 * 01 abcdef  => Rail with signals

    52

 * 10 ??????  => Unused

    53

 * 11 ????dd  => Depot

    54

 *

    55

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

    56

 * value for each track is given.

    57

 */

    58

    59

/*         4

    60

 *     ---------

    61

 *    |\       /|

    62

 *    | \    1/ |

    63

 *    |  \   /  |

    64

 *    |   \ /   |

    65

 *  16|    \    |32

    66

 *    |   / \2  |

    67

 *    |  /   \  |

    68

 *    | /     \ |

    69

 *    |/       \|

    70

 *     ---------

    71

 *         8

    72

 */

    73

    74

    75

// Constants for lower part of Map2 byte.

    76

enum RailMap2Lower4 {

    77

	RAIL_MAP2LO_GROUND_MASK = 0xF,

    78

	RAIL_GROUND_BROWN = 0,

    79

	RAIL_GROUND_GREEN = 1,

    80

	RAIL_GROUND_FENCE_NW = 2,

    81

	RAIL_GROUND_FENCE_SE = 3,

    82

	RAIL_GROUND_FENCE_SENW = 4,

    83

	RAIL_GROUND_FENCE_NE = 5,

    84

	RAIL_GROUND_FENCE_SW = 6,

    85

	RAIL_GROUND_FENCE_NESW = 7,

    86

	RAIL_GROUND_FENCE_VERT1 = 8,

    87

	RAIL_GROUND_FENCE_VERT2 = 9,

    88

	RAIL_GROUND_FENCE_HORIZ1 = 10,

    89

	RAIL_GROUND_FENCE_HORIZ2 = 11,

    90

	RAIL_GROUND_ICE_DESERT = 12,

    91

};

    92

    93

    94

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

    95

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

    96

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

    97

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

    98

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

    99

 *				 similar for lower and right.

   100

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

   101

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

   102

 * MAP5:         00abcdef => rail

   103

 *               01abcdef => rail w/ signals

   104

 *               10uuuuuu => unused

   105

 *               11uuuudd => rail depot

   106

 */

   107

   108

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

   109

{

   110

	_error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;

   111

   112

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

   113

   114

		if (map5 & trackbits) {

   115

			_error_message = STR_1007_ALREADY_BUILT;

   116

			return false;

   117

		}

   118

   119

		map5 |= trackbits;

   120

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

   121

   122

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

   123

		_error_message = STR_1007_ALREADY_BUILT;

   124

		if (map5 & trackbits)

   125

			return false;

   126

   127

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

   128

		if (!(flags&DC_NO_RAIL_OVERLAP))

   129

			return true;

   130

   131

		map5 |= trackbits;

   132

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

   133

	} else {

   134

		return false;

   135

	}

   136

}

   137

   138

   139

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

   140

   141

// set of normal ones

   142

{

   143

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

   144

	RAIL_BIT_RIGHT,

   145

	RAIL_BIT_UPPER,

   146

	RAIL_BIT_DIAG1,

   147

   148

	RAIL_BIT_LEFT,

   149

	0,

   150

	RAIL_BIT_DIAG2,

   151

	RAIL_BIT_LOWER,

   152

   153

	RAIL_BIT_LOWER,

   154

	RAIL_BIT_DIAG2,

   155

	0,

   156

	RAIL_BIT_LEFT,

   157

   158

	RAIL_BIT_DIAG1,

   159

	RAIL_BIT_UPPER,

   160

	RAIL_BIT_RIGHT,

   161

},

   162

   163

// allowed rail for an evenly raised platform

   164

{

   165

	0,

   166

	RAIL_BIT_LEFT,

   167

	RAIL_BIT_LOWER,

   168

	RAIL_BIT_DIAG2 | RAIL_BIT_LOWER | RAIL_BIT_LEFT,

   169

   170

	RAIL_BIT_RIGHT,

   171

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

   172

	RAIL_BIT_DIAG1 | RAIL_BIT_LOWER | RAIL_BIT_RIGHT,

   173

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

   174

   175

	RAIL_BIT_UPPER,

   176

	RAIL_BIT_DIAG1 | RAIL_BIT_UPPER | RAIL_BIT_LEFT,

   177

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

   178

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

   179

   180

	RAIL_BIT_DIAG2 | RAIL_BIT_UPPER | RAIL_BIT_RIGHT,

   181

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

   182

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

   183

},

   184

   185

// allowed rail on coast tile

   186

{

   187

	0,

   188

	RAIL_BIT_LEFT,

   189

	RAIL_BIT_LOWER,

   190

	RAIL_BIT_DIAG2|RAIL_BIT_LEFT|RAIL_BIT_LOWER,

   191

   192

	RAIL_BIT_RIGHT,

   193

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

   194

	RAIL_BIT_DIAG1|RAIL_BIT_RIGHT|RAIL_BIT_LOWER,

   195

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

   196

   197

	RAIL_BIT_UPPER,

   198

	RAIL_BIT_DIAG1|RAIL_BIT_LEFT|RAIL_BIT_UPPER,

   199

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

   200

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

   201

   202

	RAIL_BIT_DIAG2|RAIL_BIT_RIGHT|RAIL_BIT_UPPER,

   203

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

   204

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

   205

	},

   206

   207

	// valid railway crossings on slopes

   208

	{

   209

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

   210

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

   211

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

   212

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

   213

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

   214

	}

   215

};

   216

   217

uint GetRailFoundation(uint tileh, uint bits)

   218

{

   219

	int i;

   220

   221

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

   222

		return 0;

   223

   224

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

   225

		return tileh;

   226

   227

	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)))

   228

		return i + 15;

   229

   230

	return 0;

   231

}

   232

   233

//

   234

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

   235

{

   236

	// never allow building on top of steep tiles

   237

	if (!(tileh & 0x10)) {

   238

		rail_bits |= existing;

   239

   240

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

   241

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

   242

			return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   243

		}

   244

   245

		// no special foundation

   246

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

   247

			return 0;

   248

   249

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

   250

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

   251

			return existing ? 0 : _price.terraform;

   252

		}

   253

	}

   254

	return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   255

}

   256

   257

/* Build a single track.

   258

 * p1 - railroad type normal/maglev

   259

 * p2 - tile direction

   260

 */

   261

   262

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

   263

{

   264

	TileInfo ti;

   265

	int32 ret, cost = 0;

   266

	byte rail_bit = 1 << p2;

   267

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

   268

	uint tile;

   269

	byte existing = 0;

   270

	bool need_clear = false;

   271

   272

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   273

   274

	_error_message = STR_1007_ALREADY_BUILT;

   275

   276

	FindLandscapeHeight(&ti, x, y);

   277

	tile = ti.tile;

   278

   279

	// allow building rail under bridge

   280

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

   281

		return CMD_ERROR;

   282

   283

	if (ti.type == MP_TUNNELBRIDGE) {

   284

/* BUILD ON BRIDGE CODE */

   285

		if (!EnsureNoVehicleZ(tile, TilePixelHeight(tile)))

   286

			return CMD_ERROR;

   287

   288

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

   289

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

   290

   291

			if (!(flags & DC_EXEC))

   292

				return _price.build_rail;

   293

   294

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

   295

			goto set_ownership;

   296

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

   297

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

   298

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

   299

			return CMD_ERROR;

   300

		} else

   301

			goto need_clear;

   302

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

   303

		byte m5;

   304

/* BUILD ON STREET CODE */

   305

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

   306

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   307

   308

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

   309

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   310

   311

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

   312

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

   313

				if (rail_bit != 2) goto need_clear;

   314

				m5 = 0x10;

   315

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

   316

				if (rail_bit != 1) goto need_clear;

   317

				m5 = 0x18;

   318

			} else

   319

				goto need_clear;

   320

   321

			if (!(flags & DC_EXEC))

   322

				return _price.build_rail;

   323

   324

			ModifyTile(tile,

   325

				MP_SETTYPE(MP_STREET) |

   326

				MP_MAP3LO | MP_MAP3HI | MP_MAPOWNER_CURRENT | MP_MAP5,

   327

				_map_owner[tile], /* map3_lo */

   328

				p1, /* map3_hi */

   329

				m5  /* map5 */

   330

			);

   331

			goto fix_signals;

   332

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

   333

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

   334

			return CMD_ERROR;

   335

		} else

   336

			goto need_clear;

   337

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

   338

   339

/* BUILD ON RAILWAY CODE */

   340

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

   341

			goto need_clear;

   342

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

   343

			return CMD_ERROR;

   344

   345

		existing = ti.map5 & 0x3F;

   346

	} else {

   347

   348

/* DEFAULT BUILD ON CODE */

   349

need_clear:;

   350

		/* isnot_railway */

   351

		if (!(flags & DC_EXEC)) {

   352

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

   353

			if (ret == CMD_ERROR) return CMD_ERROR;

   354

			cost += ret;

   355

		}

   356

		need_clear = true;

   357

	}

   358

   359

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

   360

	if (ret & 0x80000000)

   361

		return ret;

   362

	cost += ret;

   363

   364

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

   365

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

   366

		return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   367

   368

	if (flags & DC_EXEC && need_clear) {

   369

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

   370

		if (ret == CMD_ERROR) return CMD_ERROR;

   371

		cost += ret;

   372

	}

   373

   374

	if (flags & DC_EXEC) {

   375

		SetTileType(tile, MP_RAILWAY);

   376

		_map5[tile] |= rail_bit;

   377

		_map2[tile] &= ~RAIL_MAP2LO_GROUND_MASK;

   378

   379

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

   380

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

   381

			_map2[tile] &= ~0xF0;

   382

   383

set_ownership:

   384

		_map_owner[tile] = _current_player;

   385

   386

		_map3_lo[tile] &= ~0xF;

   387

		_map3_lo[tile] |= rail_type;

   388

   389

		MarkTileDirtyByTile(tile);

   390

   391

fix_signals:

   392

		SetSignalsOnBothDir(tile, (byte)p2);

   393

	}

   394

   395

	return cost + _price.build_rail;

   396

}

   397

   398

static const byte _signals_table[] = {

   399

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

   400

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

   401

};

   402

   403

static const byte _signals_table_other[] = {

   404

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

   405

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

   406

};

   407

   408

static const byte _signals_table_both[] = {

   409

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

   410

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

   411

};

   412

   413

   414

/* Remove a single track.

   415

 * p1 - unused

   416

 * p2 - tile direction

   417

 */

   418

   419

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

   420

{

   421

	TileInfo ti;

   422

	byte rail_bit = 1 << p2;

   423

	byte m5;

   424

	uint tile;

   425

   426

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   427

   428

	FindLandscapeHeight(&ti, x, y);

   429

   430

	tile = ti.tile;

   431

   432

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

   433

		return CMD_ERROR;

   434

   435

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

   436

		return CMD_ERROR;

   437

   438

	// allow building rail under bridge

   439

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

   440

		return CMD_ERROR;

   441

   442

	if (ti.type == MP_TUNNELBRIDGE) {

   443

		if (!EnsureNoVehicleZ(tile, TilePixelHeight(tile)))

   444

			return CMD_ERROR;

   445

   446

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

   447

			return CMD_ERROR;

   448

   449

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

   450

			return CMD_ERROR;

   451

   452

		if (!(flags & DC_EXEC))

   453

			return _price.remove_rail;

   454

   455

		_map_owner[tile] = OWNER_NONE;

   456

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

   457

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

   458

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

   459

			return CMD_ERROR;

   460

   461

		if (ti.map5 & 0xE0)

   462

			return CMD_ERROR;

   463

   464

		if (ti.map5 & 8) {

   465

			m5 = 5;

   466

			if (rail_bit != 1)

   467

				return CMD_ERROR;

   468

		} else {

   469

			m5 = 10;

   470

			if (rail_bit != 2)

   471

				return CMD_ERROR;

   472

		}

   473

   474

		if (!(flags & DC_EXEC))

   475

			return _price.remove_rail;

   476

   477

		_map5[tile] = m5;

   478

		_map_owner[tile] = _map3_lo[tile];

   479

		_map2[tile] = 0;

   480

	} else {

   481

		assert(ti.type == MP_RAILWAY);

   482

   483

		if (ti.map5 & RAIL_TYPE_SPECIAL)

   484

			return CMD_ERROR;

   485

   486

		if (!(ti.map5 & rail_bit))

   487

			return CMD_ERROR;

   488

   489

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

   490

		if (ti.map5 & RAIL_TYPE_SIGNALS) {

   491

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

   492

				return CMD_ERROR;

   493

		}

   494

   495

		if (!(flags & DC_EXEC))

   496

			return _price.remove_rail;

   497

   498

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

   499

			DoClearSquare(tile);

   500

			goto skip_mark_dirty;

   501

		}

   502

	}

   503

   504

	/* mark_dirty */

   505

	MarkTileDirtyByTile(tile);

   506

   507

skip_mark_dirty:;

   508

   509

	SetSignalsOnBothDir(tile, (byte)p2);

   510

   511

	return _price.remove_rail;

   512

}

   513

   514

static const struct {

   515

	int8 xinc[16];

   516

	int8 yinc[16];

   517

} _railbit = {{

   518

//  0   1   2   3   4   5

   519

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