1

#include "stdafx.h"

     2

#include "openttd.h"

     3

#include "debug.h"

     4

#include "table/sprites.h"

     5

#include "table/strings.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 "engine.h"

    13

#include "town.h"

    14

#include "sound.h"

    15

#include "station.h"

    16

#include "sprite.h"

    17

#include "depot.h"

    18

#include "pbs.h"

    19

#include "waypoint.h"

    20

#include "npf.h"

    21

#include "rail.h"

    22

    23

extern uint16 _custom_sprites_base;

    24

    25

void ShowTrainDepotWindow(TileIndex tile);

    26

    27

/* Format of rail map5 byte.

    28

 * 00 abcdef  => Normal rail

    29

 * 01 abcdef  => Rail with signals

    30

 * 10 ??????  => Unused

    31

 * 11 ????dd  => Depot

    32

 *

    33

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

    34

 * value for each track is given.

    35

 */

    36

    37

/*         4

    38

 *     ---------

    39

 *    |\       /|

    40

 *    | \    1/ |

    41

 *    |  \   /  |

    42

 *    |   \ /   |

    43

 *  16|    \    |32

    44

 *    |   / \2  |

    45

 *    |  /   \  |

    46

 *    | /     \ |

    47

 *    |/       \|

    48

 *     ---------

    49

 *         8

    50

 */

    51

    52

    53

// Constants for lower part of Map2 byte.

    54

enum RailMap2Lower4 {

    55

	RAIL_MAP2LO_GROUND_MASK = 0xF,

    56

	RAIL_GROUND_BROWN = 0,

    57

	RAIL_GROUND_GREEN = 1,

    58

	RAIL_GROUND_FENCE_NW = 2,

    59

	RAIL_GROUND_FENCE_SE = 3,

    60

	RAIL_GROUND_FENCE_SENW = 4,

    61

	RAIL_GROUND_FENCE_NE = 5,

    62

	RAIL_GROUND_FENCE_SW = 6,

    63

	RAIL_GROUND_FENCE_NESW = 7,

    64

	RAIL_GROUND_FENCE_VERT1 = 8,

    65

	RAIL_GROUND_FENCE_VERT2 = 9,

    66

	RAIL_GROUND_FENCE_HORIZ1 = 10,

    67

	RAIL_GROUND_FENCE_HORIZ2 = 11,

    68

	RAIL_GROUND_ICE_DESERT = 12,

    69

};

    70

    71

    72

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

    73

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

    74

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

    75

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

    76

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

    77

 *				 similar for lower and right.

    78

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

    79

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

    80

 * MAP5:         00abcdef => rail

    81

 *               01abcdef => rail w/ signals

    82

 *               10uuuuuu => unused

    83

 *               11uuuudd => rail depot

    84

 */

    85

    86

static bool CheckTrackCombination(TileIndex tile, TrackBits to_build, uint flags)

    87

{

    88

	RailTileType type = GetRailTileType(tile);

    89

	TrackBits current; /* The current track layout */

    90

	TrackBits future; /* The track layout we want to build */

    91

	_error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;

    92

    93

	if (type != RAIL_TYPE_NORMAL && type != RAIL_TYPE_SIGNALS)

    94

		return false; /* Cannot build anything on depots and checkpoints */

    95

    96

	/* So, we have a tile with tracks on it (and possibly signals). Let's see

    97

	 * what tracks first */

    98

	current = GetTrackBits(tile);

    99

	future = current | to_build;

   100

   101

	/* Are we really building something new? */

   102

	if (current == future) {

   103

		/* Nothing new is being built */

   104

		_error_message = STR_1007_ALREADY_BUILT;

   105

		return false;

   106

	}

   107

   108

	/* Let's see if we may build this */

   109

	if ((flags & DC_NO_RAIL_OVERLAP) || type == RAIL_TYPE_SIGNALS) {

   110

		/* If we are not allowed to overlap (flag is on for ai players or we have

   111

		 * signals on the tile), check that */

   112

		return

   113

			future == (TRACK_BIT_UPPER | TRACK_BIT_LOWER) ||

   114

			future == (TRACK_BIT_LEFT  | TRACK_BIT_RIGHT);

   115

	} else {

   116

		/* Normally, we may overlap and any combination is valid */

   117

		return true;

   118

	}

   119

}

   120

   121

   122

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

   123

   124

// set of normal ones

   125

{

   126

	TRACK_BIT_DIAG1|TRACK_BIT_DIAG2|TRACK_BIT_UPPER|TRACK_BIT_LOWER|TRACK_BIT_LEFT|TRACK_BIT_RIGHT,

   127

	TRACK_BIT_RIGHT,

   128

	TRACK_BIT_UPPER,

   129

	TRACK_BIT_DIAG1,

   130

   131

	TRACK_BIT_LEFT,

   132

	0,

   133

	TRACK_BIT_DIAG2,

   134

	TRACK_BIT_LOWER,

   135

   136

	TRACK_BIT_LOWER,

   137

	TRACK_BIT_DIAG2,

   138

	0,

   139

	TRACK_BIT_LEFT,

   140

   141

	TRACK_BIT_DIAG1,

   142

	TRACK_BIT_UPPER,

   143

	TRACK_BIT_RIGHT,

   144

},

   145

   146

// allowed rail for an evenly raised platform

   147

{

   148

	0,

   149

	TRACK_BIT_LEFT,

   150

	TRACK_BIT_LOWER,

   151

	TRACK_BIT_DIAG2 | TRACK_BIT_LOWER | TRACK_BIT_LEFT,

   152

   153

	TRACK_BIT_RIGHT,

   154

	TRACK_BIT_DIAG1|TRACK_BIT_DIAG2|TRACK_BIT_UPPER|TRACK_BIT_LOWER|TRACK_BIT_LEFT|TRACK_BIT_RIGHT,

   155

	TRACK_BIT_DIAG1 | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,

   156

	TRACK_BIT_DIAG1|TRACK_BIT_DIAG2|TRACK_BIT_UPPER|TRACK_BIT_LOWER|TRACK_BIT_LEFT|TRACK_BIT_RIGHT,

   157

   158

	TRACK_BIT_UPPER,

   159

	TRACK_BIT_DIAG1 | TRACK_BIT_UPPER | TRACK_BIT_LEFT,

   160

	TRACK_BIT_DIAG1|TRACK_BIT_DIAG2|TRACK_BIT_UPPER|TRACK_BIT_LOWER|TRACK_BIT_LEFT|TRACK_BIT_RIGHT,

   161

	TRACK_BIT_DIAG1|TRACK_BIT_DIAG2|TRACK_BIT_UPPER|TRACK_BIT_LOWER|TRACK_BIT_LEFT|TRACK_BIT_RIGHT,

   162

   163

	TRACK_BIT_DIAG2 | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,

   164

	TRACK_BIT_DIAG1|TRACK_BIT_DIAG2|TRACK_BIT_UPPER|TRACK_BIT_LOWER|TRACK_BIT_LEFT|TRACK_BIT_RIGHT,

   165

	TRACK_BIT_DIAG1|TRACK_BIT_DIAG2|TRACK_BIT_UPPER|TRACK_BIT_LOWER|TRACK_BIT_LEFT|TRACK_BIT_RIGHT,

   166

},

   167

   168

// allowed rail on coast tile

   169

{

   170

	0,

   171

	TRACK_BIT_LEFT,

   172

	TRACK_BIT_LOWER,

   173

	TRACK_BIT_DIAG2|TRACK_BIT_LEFT|TRACK_BIT_LOWER,

   174

   175

	TRACK_BIT_RIGHT,

   176

	TRACK_BIT_DIAG1|TRACK_BIT_DIAG2|TRACK_BIT_UPPER|TRACK_BIT_LOWER|TRACK_BIT_LEFT|TRACK_BIT_RIGHT,

   177

	TRACK_BIT_DIAG1|TRACK_BIT_RIGHT|TRACK_BIT_LOWER,

   178

	TRACK_BIT_DIAG1|TRACK_BIT_DIAG2|TRACK_BIT_UPPER|TRACK_BIT_LOWER|TRACK_BIT_LEFT|TRACK_BIT_RIGHT,

   179

   180

	TRACK_BIT_UPPER,

   181

	TRACK_BIT_DIAG1|TRACK_BIT_LEFT|TRACK_BIT_UPPER,

   182

	TRACK_BIT_DIAG1|TRACK_BIT_DIAG2|TRACK_BIT_UPPER|TRACK_BIT_LOWER|TRACK_BIT_LEFT|TRACK_BIT_RIGHT,

   183

	TRACK_BIT_DIAG1|TRACK_BIT_DIAG2|TRACK_BIT_UPPER|TRACK_BIT_LOWER|TRACK_BIT_LEFT|TRACK_BIT_RIGHT,

   184

   185

	TRACK_BIT_DIAG2|TRACK_BIT_RIGHT|TRACK_BIT_UPPER,

   186

	TRACK_BIT_DIAG1|TRACK_BIT_DIAG2|TRACK_BIT_UPPER|TRACK_BIT_LOWER|TRACK_BIT_LEFT|TRACK_BIT_RIGHT,

   187

	TRACK_BIT_DIAG1|TRACK_BIT_DIAG2|TRACK_BIT_UPPER|TRACK_BIT_LOWER|TRACK_BIT_LEFT|TRACK_BIT_RIGHT,

   188

	},

   189

   190

	// valid railway crossings on slopes

   191

	{

   192

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

   193

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

   194

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

   195

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

   196

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

   197

	}

   198

};

   199

   200

uint GetRailFoundation(uint tileh, uint bits)

   201

{

   202

	int i;

   203

   204

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

   205

		return 0;

   206

   207

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

   208

		return tileh;

   209

   210

	if ( ((i=0, tileh == 1) || (i+=2, tileh == 2) || (i+=2, tileh == 4) || (i+=2, tileh == 8)) && (bits == TRACK_BIT_DIAG1 || (i++, bits == TRACK_BIT_DIAG2)))

   211

		return i + 15;

   212

   213

	return 0;

   214

}

   215

   216

//

   217

static uint32 CheckRailSlope(uint tileh, TrackBits rail_bits, TrackBits existing, TileIndex tile)

   218

{

   219

	// never allow building on top of steep tiles

   220

	if (!IsSteepTileh(tileh)) {

   221

		rail_bits |= existing;

   222

   223

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

   224

		if (IsTileType(tile, MP_WATER) &&

   225

				~_valid_tileh_slopes[2][tileh] & rail_bits) {

   226

			return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   227

		}

   228

   229

		// no special foundation

   230

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

   231

			return 0;

   232

   233

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

   234

					(rail_bits == TRACK_BIT_DIAG1 || rail_bits == TRACK_BIT_DIAG2) &&

   235

					(tileh == 1 || tileh == 2 || tileh == 4 || tileh == 8)

   236

				)) { // partly up

   237

			if (existing != 0) {

   238

				return 0;

   239

			} else if (!_patches.build_on_slopes ||

   240

					(_is_ai_player && !_patches.ainew_active)) {

   241

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   242

			} else {

   243

				return _price.terraform;

   244

			}

   245

		}

   246

	}

   247

	return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   248

}

   249

   250

/* Validate functions for rail building */

   251

static inline bool ValParamTrackOrientation(Track track) {return IsValidTrack(track);}

   252

   253

/** Build a single piece of rail

   254

 * @param x,y coordinates on where to build

   255

 * @param p1 railtype of being built piece (normal, mono, maglev)

   256

 * @param p2 rail track to build

   257

 */

   258

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

   259

{

   260

	TileIndex tile;

   261

	uint tileh;

   262

	uint m5; /* XXX: Used only as a cache, should probably be removed? */

   263

	Track track = (Track)p2;

   264

	TrackBits trackbit;

   265

	int32 cost = 0;

   266

	int32 ret;

   267

   268

	if (!ValParamRailtype(p1) || !ValParamTrackOrientation(track)) return CMD_ERROR;

   269

   270

	tile = TileVirtXY(x, y);

   271

	tileh = GetTileSlope(tile, NULL);

   272

	m5 = _m[tile].m5;

   273

	trackbit = TrackToTrackBits(track);

   274

   275

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   276

   277

	switch (GetTileType(tile)) {

   278

		case MP_TUNNELBRIDGE:

   279

			if ((m5 & 0xC0) != 0xC0 || // not bridge middle part?

   280

					(m5 & 0x01 ? 1 : 2) != trackbit) { // wrong direction?

   281

				// Get detailed error message

   282

				return DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);

   283

			}

   284

   285

			switch (m5 & 0x38) { // what's under the bridge?

   286

				case 0x00: // clear land

   287

					ret = CheckRailSlope(tileh, trackbit, 0, tile);

   288

					if (CmdFailed(ret)) return ret;

   289

					cost += ret;

   290

   291

					if (flags & DC_EXEC) {

   292

						SetTileOwner(tile, _current_player);

   293

						_m[tile].m3 &= ~0x0F;

   294

						_m[tile].m3 |= p1;

   295

						_m[tile].m5 = (m5 & 0xC7) | 0x20; // railroad under bridge

   296

					}

   297

					break;

   298

   299

				case 0x20: // rail already there

   300

					return_cmd_error(STR_1007_ALREADY_BUILT);

   301

   302

				default:

   303

					// Get detailed error message

   304

					return DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);

   305

			}

   306

			break;

   307

   308

		case MP_RAILWAY:

   309

			if (!CheckTrackCombination(tile, trackbit, flags) ||

   310

					!EnsureNoVehicle(tile)) {

   311

				return CMD_ERROR;

   312

			}

   313

			if (m5 & RAIL_TYPE_SPECIAL ||

   314

					!IsTileOwner(tile, _current_player) ||

   315

					(_m[tile].m3 & 0xFU) != p1) {

   316

				// Get detailed error message

   317

				return DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);

   318

			}

   319

   320

			ret = CheckRailSlope(tileh, trackbit, GetTrackBits(tile), tile);

   321

			if (CmdFailed(ret)) return ret;

   322

			cost += ret;

   323

   324

			if (flags & DC_EXEC) {

   325

				_m[tile].m2 &= ~RAIL_MAP2LO_GROUND_MASK; // Bare land

   326

				_m[tile].m5 = m5 | trackbit;

   327

			}

   328

			break;

   329

   330

		case MP_STREET:

   331

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

   332

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   333

			if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   334

   335

			if ((m5 & 0xF0) == 0 && ( // normal road?

   336

						(track == TRACK_DIAG1 && m5 == 0x05) ||

   337

						(track == TRACK_DIAG2 && m5 == 0x0A) // correct direction?

   338

					)) {

   339

				if (flags & DC_EXEC) {

   340

					_m[tile].m3 = GetTileOwner(tile);

   341

					SetTileOwner(tile, _current_player);

   342

					_m[tile].m4 = p1;

   343

					_m[tile].m5 = 0x10 | (track == TRACK_DIAG1 ? 0x08 : 0x00); // level crossing

   344

				}

   345

				break;

   346

			}

   347

   348

			if (IsLevelCrossing(tile) && (m5 & 0x08 ? TRACK_DIAG1 : TRACK_DIAG2) == track)

   349

				return_cmd_error(STR_1007_ALREADY_BUILT);

   350

			/* FALLTHROUGH */

   351

   352

		default:

   353

			ret = CheckRailSlope(tileh, trackbit, 0, tile);

   354

			if (CmdFailed(ret)) return ret;

   355

			cost += ret;

   356

   357

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

   358

			if (CmdFailed(ret)) return ret;

   359

			cost += ret;

   360

   361

			if (flags & DC_EXEC) {

   362

				SetTileType(tile, MP_RAILWAY);

   363

				SetTileOwner(tile, _current_player);

   364

				_m[tile].m2 = 0; // Bare land

   365

				_m[tile].m3 = p1; // No signals, rail type

   366

				_m[tile].m5 = trackbit;

   367

			}

   368

			break;

   369

	}

   370

   371

	if (flags & DC_EXEC) {

   372

		MarkTileDirtyByTile(tile);

   373

		SetSignalsOnBothDir(tile, track);

   374

	}

   375

   376

	return cost + _price.build_rail;

   377

}

   378

   379

static const byte _signals_table[] = {

   380

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

   381

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

   382

};

   383

   384

static const byte _signals_table_other[] = {

   385

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

   386

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

   387

};

   388

   389

static const byte _signals_table_both[] = {

   390

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

   391

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

   392

};

   393

   394

   395

/** Remove a single piece of track

   396

 * @param x,y coordinates for removal of track

   397

 * @param p1 unused

   398

 * @param p2 rail orientation

   399

 */

   400

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

   401

{

   402

	Track track = (Track)p2;

   403

	TrackBits trackbit;

   404

	uint tileh;

   405

	TileIndex tile;

   406

	byte m5;

   407

	int32 cost = _price.remove_rail;

   408

   409

	if (!ValParamTrackOrientation(p2)) return CMD_ERROR;

   410

	trackbit = TrackToTrackBits(track);

   411

   412

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   413

   414

	tile = TileVirtXY(x, y);

   415

	tileh = GetTileSlope(tile, NULL);

   416

   417

	if (!IsTileType(tile, MP_TUNNELBRIDGE) && !IsTileType(tile, MP_STREET) && !IsTileType(tile, MP_RAILWAY))

   418

		return CMD_ERROR;

   419

   420

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

   421

		return CMD_ERROR;

   422

   423

	// allow building rail under bridge

   424

	if (!IsTileType(tile, MP_TUNNELBRIDGE) && !EnsureNoVehicle(tile))

   425

		return CMD_ERROR;

   426

   427

	switch(GetTileType(tile))

   428

	{

   429

		case MP_TUNNELBRIDGE:

   430

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

   431

				return CMD_ERROR;

   432

   433

			if ((_m[tile].m5 & 0xF8) != 0xE0)

   434

				return CMD_ERROR;

   435

   436

			if ( ((_m[tile].m5 & 1) ? 1 : 2) != trackbit )

   437

				return CMD_ERROR;

   438

   439

			if (!(flags & DC_EXEC))

   440

				return _price.remove_rail;

   441

   442

		SetTileOwner(tile, OWNER_NONE);

   443

			_m[tile].m5 = _m[tile].m5 & 0xC7;

   444

			break;

   445

		case MP_STREET:

   446

			if (!(_m[tile].m5 & 0xF0))

   447

				return CMD_ERROR;

   448

   449

			if (_m[tile].m5 & 0xE0)

   450

				return CMD_ERROR;

   451

   452

			/* This is a crossing, let's check if the direction is correct */

   453

			if (_m[tile].m5 & 8) {

   454

				m5 = 5;

   455

				if (track != TRACK_DIAG1)

   456

					return CMD_ERROR;

   457

			} else {

   458

				m5 = 10;

   459

				if (track != TRACK_DIAG2)

   460

					return CMD_ERROR;

   461

			}

   462

   463

			if (!(flags & DC_EXEC))

   464

				return _price.remove_rail;

   465

   466

			_m[tile].m5 = m5;

   467

			SetTileOwner(tile, _m[tile].m3);

   468

			_m[tile].m2 = 0;

   469

			break;

   470

		case MP_RAILWAY:

   471

   472

			if (!IsPlainRailTile(tile))

   473

				return CMD_ERROR;

   474

   475

			/* See if the track to remove is actually there */

   476

			if (!(GetTrackBits(tile) & trackbit))

   477

				return CMD_ERROR;

   478

   479

			/* Charge extra to remove signals on the track, if they are there */

   480

			if (HasSignalOnTrack(tile, track))

   481

				cost += DoCommand(x, y, track, 0, flags, CMD_REMOVE_SIGNALS);

   482

   483

			if (!(flags & DC_EXEC))

   484

				return cost;

   485

   486

			/* We remove the trackbit here. */

   487

			_m[tile].m5 &= ~trackbit;

   488

   489

			/* Unreserve track for PBS */

   490

			if (PBSTileReserved(tile) & trackbit)

   491

				PBSClearTrack(tile, track);

   492

   493

			if (GetTrackBits(tile)  == 0) {

   494

				/* The tile has no tracks left, it is no longer a rail tile */