1

#include "stdafx.h"

     2

#include "ttd.h"

     3

#include "table/sprites.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

#include "waypoint.h"

    18

    19

extern uint16 _custom_sprites_base;

    20

    21

void ShowTrainDepotWindow(uint tile);

    22

    23

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

    24

	RAIL_TYPE_NORMAL = 0,

    25

	RAIL_TYPE_SIGNALS = 0x40,

    26

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

    27

	RAIL_TYPE_DEPOT = 0xC0,

    28

	RAIL_TYPE_MASK = 0xC0,

    29

    30

	RAIL_BIT_DIAG1 = 1,  // 0

    31

	RAIL_BIT_DIAG2 = 2,  // 1

    32

	RAIL_BIT_UPPER = 4,  // 2

    33

	RAIL_BIT_LOWER = 8,  // 3

    34

	RAIL_BIT_LEFT  = 16, // 4

    35

	RAIL_BIT_RIGHT = 32, // 5

    36

	RAIL_BIT_MASK = 0x3F,

    37

    38

	RAIL_DEPOT_TRACK_MASK = 1,

    39

	RAIL_DEPOT_DIR = 3,

    40

    41

	RAIL_SUBTYPE_MASK     = 0x3C,

    42

	RAIL_SUBTYPE_DEPOT    = 0x00,

    43

	RAIL_SUBTYPE_WAYPOINT = 0x04

    44

};

    45

    46

static inline bool IsRailDepot(byte m5)

    47

{

    48

	return

    49

		(m5 & RAIL_TYPE_MASK) == RAIL_TYPE_DEPOT &&

    50

		(m5 & RAIL_SUBTYPE_MASK) == RAIL_SUBTYPE_DEPOT;

    51

}

    52

    53

/* Format of rail map5 byte.

    54

 * 00 abcdef  => Normal rail

    55

 * 01 abcdef  => Rail with signals

    56

 * 10 ??????  => Unused

    57

 * 11 ????dd  => Depot

    58

 *

    59

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

    60

 * value for each track is given.

    61

 */

    62

    63

/*         4

    64

 *     ---------

    65

 *    |\       /|

    66

 *    | \    1/ |

    67

 *    |  \   /  |

    68

 *    |   \ /   |

    69

 *  16|    \    |32

    70

 *    |   / \2  |

    71

 *    |  /   \  |

    72

 *    | /     \ |

    73

 *    |/       \|

    74

 *     ---------

    75

 *         8

    76

 */

    77

    78

    79

// Constants for lower part of Map2 byte.

    80

enum RailMap2Lower4 {

    81

	RAIL_MAP2LO_GROUND_MASK = 0xF,

    82

	RAIL_GROUND_BROWN = 0,

    83

	RAIL_GROUND_GREEN = 1,

    84

	RAIL_GROUND_FENCE_NW = 2,

    85

	RAIL_GROUND_FENCE_SE = 3,

    86

	RAIL_GROUND_FENCE_SENW = 4,

    87

	RAIL_GROUND_FENCE_NE = 5,

    88

	RAIL_GROUND_FENCE_SW = 6,

    89

	RAIL_GROUND_FENCE_NESW = 7,

    90

	RAIL_GROUND_FENCE_VERT1 = 8,

    91

	RAIL_GROUND_FENCE_VERT2 = 9,

    92

	RAIL_GROUND_FENCE_HORIZ1 = 10,

    93

	RAIL_GROUND_FENCE_HORIZ2 = 11,

    94

	RAIL_GROUND_ICE_DESERT = 12,

    95

};

    96

    97

    98

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

    99

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

   100

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

   101

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

   102

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

   103

 *				 similar for lower and right.

   104

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

   105

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

   106

 * MAP5:         00abcdef => rail

   107

 *               01abcdef => rail w/ signals

   108

 *               10uuuuuu => unused

   109

 *               11uuuudd => rail depot

   110

 */

   111

   112

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

   113

{

   114

	_error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;

   115

   116

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

   117

   118

		if (map5 & trackbits) {

   119

			_error_message = STR_1007_ALREADY_BUILT;

   120

			return false;

   121

		}

   122

   123

		map5 |= trackbits;

   124

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

   125

   126

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

   127

		_error_message = STR_1007_ALREADY_BUILT;

   128

		if (map5 & trackbits)

   129

			return false;

   130

   131

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

   132

		if (!(flags&DC_NO_RAIL_OVERLAP))

   133

			return true;

   134

   135

		map5 |= trackbits;

   136

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

   137

	} else {

   138

		return false;

   139

	}

   140

}

   141

   142

   143

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

   144

   145

// set of normal ones

   146

{

   147

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

   148

	RAIL_BIT_RIGHT,

   149

	RAIL_BIT_UPPER,

   150

	RAIL_BIT_DIAG1,

   151

   152

	RAIL_BIT_LEFT,

   153

	0,

   154

	RAIL_BIT_DIAG2,

   155

	RAIL_BIT_LOWER,

   156

   157

	RAIL_BIT_LOWER,

   158

	RAIL_BIT_DIAG2,

   159

	0,

   160

	RAIL_BIT_LEFT,

   161

   162

	RAIL_BIT_DIAG1,

   163

	RAIL_BIT_UPPER,

   164

	RAIL_BIT_RIGHT,

   165

},

   166

   167

// allowed rail for an evenly raised platform

   168

{

   169

	0,

   170

	RAIL_BIT_LEFT,

   171

	RAIL_BIT_LOWER,

   172

	RAIL_BIT_DIAG2 | RAIL_BIT_LOWER | RAIL_BIT_LEFT,

   173

   174

	RAIL_BIT_RIGHT,

   175

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

   176

	RAIL_BIT_DIAG1 | RAIL_BIT_LOWER | RAIL_BIT_RIGHT,

   177

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

   178

   179

	RAIL_BIT_UPPER,

   180

	RAIL_BIT_DIAG1 | RAIL_BIT_UPPER | RAIL_BIT_LEFT,

   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

	RAIL_BIT_DIAG2 | RAIL_BIT_UPPER | RAIL_BIT_RIGHT,

   185

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

   186

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

   187

},

   188

   189

// allowed rail on coast tile

   190

{

   191

	0,

   192

	RAIL_BIT_LEFT,

   193

	RAIL_BIT_LOWER,

   194

	RAIL_BIT_DIAG2|RAIL_BIT_LEFT|RAIL_BIT_LOWER,

   195

   196

	RAIL_BIT_RIGHT,

   197

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

   198

	RAIL_BIT_DIAG1|RAIL_BIT_RIGHT|RAIL_BIT_LOWER,

   199

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

   200

   201

	RAIL_BIT_UPPER,

   202

	RAIL_BIT_DIAG1|RAIL_BIT_LEFT|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

	RAIL_BIT_DIAG2|RAIL_BIT_RIGHT|RAIL_BIT_UPPER,

   207

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

   208

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

   209

	},

   210

   211

	// valid railway crossings on slopes

   212

	{

   213

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

   214

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

   215

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

   216

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

   217

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

   218

	}

   219

};

   220

   221

uint GetRailFoundation(uint tileh, uint bits)

   222

{

   223

	int i;

   224

   225

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

   226

		return 0;

   227

   228

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

   229

		return tileh;

   230

   231

	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)))

   232

		return i + 15;

   233

   234

	return 0;

   235

}

   236

   237

//

   238

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

   239

{

   240

	// never allow building on top of steep tiles

   241

	if (!(tileh & 0x10)) {

   242

		rail_bits |= existing;

   243

   244

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

   245

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

   246

			return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   247

		}

   248

   249

		// no special foundation

   250

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

   251

			return 0;

   252

   253

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

   254

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

   255

			return existing ? 0 : _price.terraform;

   256

		}

   257

	}

   258

	return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   259

}

   260

   261

/* Build a single track.

   262

 * p1 - railroad type normal/maglev

   263

 * p2 - tile direction

   264

 */

   265

   266

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

   267

{

   268

	TileInfo ti;

   269

	int32 ret, cost = 0;

   270

	byte rail_bit = 1 << p2;

   271

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

   272

	uint tile;

   273

	byte existing = 0;

   274

	bool need_clear = false;

   275

   276

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   277

   278

	_error_message = STR_1007_ALREADY_BUILT;

   279

   280

	FindLandscapeHeight(&ti, x, y);

   281

	tile = ti.tile;

   282

   283

	// allow building rail under bridge

   284

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

   285

		return CMD_ERROR;

   286

   287

	if (ti.type == MP_TUNNELBRIDGE) {

   288

/* BUILD ON BRIDGE CODE */

   289

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

   290

			return CMD_ERROR;

   291

   292

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

   293

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

   294

   295

			if (!(flags & DC_EXEC))

   296

				return _price.build_rail;

   297

   298

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

   299

			goto set_ownership;

   300

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

   301

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

   302

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

   303

			return CMD_ERROR;

   304

		} else

   305

			goto need_clear;

   306

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

   307

		byte m5;

   308

/* BUILD ON STREET CODE */

   309

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

   310

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   311

   312

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

   313

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   314

   315

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

   316

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

   317

				if (rail_bit != 2) goto need_clear;

   318

				m5 = 0x10;

   319

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

   320

				if (rail_bit != 1) goto need_clear;

   321

				m5 = 0x18;

   322

			} else

   323

				goto need_clear;

   324

   325

			if (!(flags & DC_EXEC))

   326

				return _price.build_rail;

   327

   328

			ModifyTile(tile,

   329

				MP_SETTYPE(MP_STREET) |

   330

				MP_MAP3LO | MP_MAP3HI | MP_MAPOWNER_CURRENT | MP_MAP5,

   331

				_map_owner[tile], /* map3_lo */

   332

				p1, /* map3_hi */

   333

				m5  /* map5 */

   334

			);

   335

			goto fix_signals;

   336

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

   337

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

   338

			return CMD_ERROR;

   339

		} else

   340

			goto need_clear;

   341

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

   342

   343

/* BUILD ON RAILWAY CODE */

   344

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

   345

			goto need_clear;

   346

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

   347

			return CMD_ERROR;

   348

   349

		existing = ti.map5 & 0x3F;

   350

	} else {

   351

   352

/* DEFAULT BUILD ON CODE */

   353

need_clear:;

   354

		/* isnot_railway */

   355

		if (!(flags & DC_EXEC)) {

   356

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

   357

			if (ret == CMD_ERROR) return CMD_ERROR;

   358

			cost += ret;

   359

		}

   360

		need_clear = true;

   361

	}

   362

   363

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

   364

	if (ret & 0x80000000)

   365

		return ret;

   366

	cost += ret;

   367

   368

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

   369

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

   370

		return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   371

   372

	if (flags & DC_EXEC && need_clear) {

   373

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

   374

		if (ret == CMD_ERROR) return CMD_ERROR;

   375

		cost += ret;

   376

	}

   377

   378

	if (flags & DC_EXEC) {

   379

		SetTileType(tile, MP_RAILWAY);

   380

		_map5[tile] |= rail_bit;

   381

		_map2[tile] &= ~RAIL_MAP2LO_GROUND_MASK;

   382

   383

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

   384

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

   385

			_map2[tile] &= ~0xF0;

   386

   387

set_ownership:

   388

		_map_owner[tile] = _current_player;

   389

   390

		_map3_lo[tile] &= ~0xF;

   391

		_map3_lo[tile] |= rail_type;

   392

   393

		MarkTileDirtyByTile(tile);

   394

   395

fix_signals:

   396

		SetSignalsOnBothDir(tile, (byte)p2);

   397

	}

   398

   399

	return cost + _price.build_rail;

   400

}

   401

   402

static const byte _signals_table[] = {

   403

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

   404

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

   405

};

   406

   407

static const byte _signals_table_other[] = {

   408

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

   409

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

   410

};

   411

   412

static const byte _signals_table_both[] = {

   413

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

   414

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

   415

};

   416

   417

   418

/* Remove a single track.

   419

 * p1 - unused

   420

 * p2 - tile direction

   421

 */

   422

   423

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

   424

{

   425

	TileInfo ti;

   426

	byte rail_bit = 1 << p2;

   427

	byte m5;

   428

	uint tile;

   429

   430

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   431

   432

	FindLandscapeHeight(&ti, x, y);

   433

   434

	tile = ti.tile;

   435

   436

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

   437

		return CMD_ERROR;

   438

   439

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

   440

		return CMD_ERROR;

   441

   442

	// allow building rail under bridge

   443

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

   444

		return CMD_ERROR;

   445

   446

	if (ti.type == MP_TUNNELBRIDGE) {

   447

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

   448

			return CMD_ERROR;

   449

   450

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

   451

			return CMD_ERROR;

   452

   453

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

   454

			return CMD_ERROR;

   455

   456

		if (!(flags & DC_EXEC))

   457

			return _price.remove_rail;

   458

   459

		_map_owner[tile] = OWNER_NONE;

   460

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

   461

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

   462

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

   463

			return CMD_ERROR;

   464

   465

		if (ti.map5 & 0xE0)

   466

			return CMD_ERROR;

   467

   468

		if (ti.map5 & 8) {

   469

			m5 = 5;

   470

			if (rail_bit != 1)

   471

				return CMD_ERROR;

   472

		} else {

   473

			m5 = 10;

   474

			if (rail_bit != 2)

   475

				return CMD_ERROR;

   476

		}

   477

   478

		if (!(flags & DC_EXEC))

   479

			return _price.remove_rail;

   480

   481

		_map5[tile] = m5;

   482

		_map_owner[tile] = _map3_lo[tile];

   483

		_map2[tile] = 0;

   484

	} else {

   485

		assert(ti.type == MP_RAILWAY);

   486

   487

		if (ti.map5 & RAIL_TYPE_SPECIAL)

   488

			return CMD_ERROR;

   489

   490

		if (!(ti.map5 & rail_bit))

   491

			return CMD_ERROR;

   492

   493

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

   494

		if (ti.map5 & RAIL_TYPE_SIGNALS) {

   495

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

   496

				return CMD_ERROR;

   497

		}

   498

   499

		if (!(flags & DC_EXEC))

   500

			return _price.remove_rail;

   501

   502

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

   503

			DoClearSquare(tile);

   504

			goto skip_mark_dirty;

   505

		}

   506

	}

   507

   508

	/* mark_dirty */

   509

	MarkTileDirtyByTile(tile);

   510

   511

skip_mark_dirty:;

   512

   513

	SetSignalsOnBothDir(tile, (byte)p2);

   514

   515

	return _price.remove_rail;

   516

}

   517

   518

static const struct {

   519

	int8 xinc[16];