1

#include "stdafx.h"

     2

#include "openttd.h"

     3

#include "debug.h"

     4

#include "functions.h"

     5

#include "table/sprites.h"

     6

#include "table/strings.h"

     7

#include "map.h"

     8

#include "tile.h"

     9

#include "vehicle.h"

    10

#include "viewport.h"

    11

#include "command.h"

    12

#include "pathfind.h"

    13

#include "engine.h"

    14

#include "town.h"

    15

#include "sound.h"

    16

#include "station.h"

    17

#include "sprite.h"

    18

#include "depot.h"

    19

#include "pbs.h"

    20

#include "waypoint.h"

    21

#include "npf.h"

    22

#include "rail.h"

    23

    24

extern uint16 _custom_sprites_base;

    25

    26

void ShowTrainDepotWindow(TileIndex tile);

    27

    28

/* Format of rail map5 byte.

    29

 * 00 abcdef  => Normal rail

    30

 * 01 abcdef  => Rail with signals

    31

 * 10 ??????  => Unused

    32

 * 11 ????dd  => Depot

    33

 *

    34

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

    35

 * value for each track is given.

    36

 */

    37

    38

/*         4

    39

 *     ---------

    40

 *    |\       /|

    41

 *    | \    1/ |

    42

 *    |  \   /  |

    43

 *    |   \ /   |

    44

 *  16|    \    |32

    45

 *    |   / \2  |

    46

 *    |  /   \  |

    47

 *    | /     \ |

    48

 *    |/       \|

    49

 *     ---------

    50

 *         8

    51

 */

    52

    53

    54

// Constants for lower part of Map2 byte.

    55

enum RailMap2Lower4 {

    56

	RAIL_MAP2LO_GROUND_MASK = 0xF,

    57

	RAIL_GROUND_BROWN = 0,

    58

	RAIL_GROUND_GREEN = 1,

    59

	RAIL_GROUND_FENCE_NW = 2,

    60

	RAIL_GROUND_FENCE_SE = 3,

    61

	RAIL_GROUND_FENCE_SENW = 4,

    62

	RAIL_GROUND_FENCE_NE = 5,

    63

	RAIL_GROUND_FENCE_SW = 6,

    64

	RAIL_GROUND_FENCE_NESW = 7,

    65

	RAIL_GROUND_FENCE_VERT1 = 8,

    66

	RAIL_GROUND_FENCE_VERT2 = 9,

    67

	RAIL_GROUND_FENCE_HORIZ1 = 10,

    68

	RAIL_GROUND_FENCE_HORIZ2 = 11,

    69

	RAIL_GROUND_ICE_DESERT = 12,

    70

};

    71

    72

    73

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

    74

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

    75

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

    76

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

    77

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

    78

 *				 similar for lower and right.

    79

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

    80

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

    81

 * MAP5:         00abcdef => rail

    82

 *               01abcdef => rail w/ signals

    83

 *               10uuuuuu => unused

    84

 *               11uuuudd => rail depot

    85

 */

    86

    87

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

    88

{

    89

	RailTileType type = GetRailTileType(tile);

    90

	TrackBits current; /* The current track layout */

    91

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

    92

	_error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;

    93

    94

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

    95

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

    96

    97

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

    98

	 * what tracks first */

    99

	current = GetTrackBits(tile);

   100

	future = current | to_build;

   101

   102

	/* Are we really building something new? */

   103

	if (current == future) {

   104

		/* Nothing new is being built */

   105

		_error_message = STR_1007_ALREADY_BUILT;

   106

		return false;

   107

	}

   108

   109

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

   110

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

   111

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

   112

		 * signals on the tile), check that */

   113

		return

   114

			future == (TRACK_BIT_UPPER | TRACK_BIT_LOWER) ||

   115

			future == (TRACK_BIT_LEFT  | TRACK_BIT_RIGHT);

   116

	} else {

   117

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

   118

		return true;

   119

	}

   120

}

   121

   122

   123

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

   124

   125

// set of normal ones

   126

{

   127

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

   128

	TRACK_BIT_RIGHT,

   129

	TRACK_BIT_UPPER,

   130

	TRACK_BIT_DIAG1,

   131

   132

	TRACK_BIT_LEFT,

   133

	0,

   134

	TRACK_BIT_DIAG2,

   135

	TRACK_BIT_LOWER,

   136

   137

	TRACK_BIT_LOWER,

   138

	TRACK_BIT_DIAG2,

   139

	0,

   140

	TRACK_BIT_LEFT,

   141

   142

	TRACK_BIT_DIAG1,

   143

	TRACK_BIT_UPPER,

   144

	TRACK_BIT_RIGHT,

   145

},

   146

   147

// allowed rail for an evenly raised platform

   148

{

   149

	0,

   150

	TRACK_BIT_LEFT,

   151

	TRACK_BIT_LOWER,

   152

	TRACK_BIT_DIAG2 | TRACK_BIT_LOWER | TRACK_BIT_LEFT,

   153

   154

	TRACK_BIT_RIGHT,

   155

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

   156

	TRACK_BIT_DIAG1 | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,

   157

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

   158

   159

	TRACK_BIT_UPPER,

   160

	TRACK_BIT_DIAG1 | TRACK_BIT_UPPER | TRACK_BIT_LEFT,

   161

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

   162

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

   163

   164

	TRACK_BIT_DIAG2 | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,

   165

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

   166

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

   167

},

   168

   169

// allowed rail on coast tile

   170

{

   171

	0,

   172

	TRACK_BIT_LEFT,

   173

	TRACK_BIT_LOWER,

   174

	TRACK_BIT_DIAG2|TRACK_BIT_LEFT|TRACK_BIT_LOWER,

   175

   176

	TRACK_BIT_RIGHT,

   177

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

   178

	TRACK_BIT_DIAG1|TRACK_BIT_RIGHT|TRACK_BIT_LOWER,

   179

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

   180

   181

	TRACK_BIT_UPPER,

   182

	TRACK_BIT_DIAG1|TRACK_BIT_LEFT|TRACK_BIT_UPPER,

   183

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

   184

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

   185

   186

	TRACK_BIT_DIAG2|TRACK_BIT_RIGHT|TRACK_BIT_UPPER,

   187

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

   188

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

   189

	},

   190

   191

	// valid railway crossings on slopes

   192

	{

   193

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

   194

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

   195

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

   196

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

   197

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

   198

	}

   199

};

   200

   201

uint GetRailFoundation(uint tileh, uint bits)

   202

{

   203

	int i;

   204

   205

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

   206

		return 0;

   207

   208

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

   209

		return tileh;

   210

   211

	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)))

   212

		return i + 15;

   213

   214

	return 0;

   215

}

   216

   217

//

   218

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

   219

{

   220

	// never allow building on top of steep tiles

   221

	if (!IsSteepTileh(tileh)) {

   222

		rail_bits |= existing;

   223

   224

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

   225

		if (IsTileType(tile, MP_WATER) &&

   226

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

   227

			return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   228

		}

   229

   230

		// no special foundation

   231

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

   232

			return 0;

   233

   234

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

   235

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

   236

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

   237

				)) { // partly up

   238

			if (existing != 0) {

   239

				return 0;

   240

			} else if (!_patches.build_on_slopes ||

   241

					(_is_ai_player && !_patches.ainew_active)) {

   242

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   243

			} else {

   244

				return _price.terraform;

   245

			}

   246

		}

   247

	}

   248

	return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   249

}

   250

   251

/* Validate functions for rail building */

   252

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

   253

   254

/** Build a single piece of rail

   255

 * @param x,y coordinates on where to build

   256

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

   257

 * @param p2 rail track to build

   258

 */

   259

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

   260

{

   261

	TileIndex tile;

   262

	uint tileh;

   263

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

   264

	Track track = (Track)p2;

   265

	TrackBits trackbit;

   266

	int32 cost = 0;

   267

	int32 ret;

   268

   269

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

   270

   271

	tile = TileVirtXY(x, y);

   272

	tileh = GetTileSlope(tile, NULL);

   273

	m5 = _m[tile].m5;

   274

	trackbit = TrackToTrackBits(track);

   275

   276

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   277

   278

	switch (GetTileType(tile)) {

   279

		case MP_TUNNELBRIDGE:

   280

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

   281

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

   282

				// Get detailed error message

   283

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

   284

			}

   285

   286

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

   287

				case 0x00: // clear land

   288

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

   289

					if (CmdFailed(ret)) return ret;

   290

					cost += ret;

   291

   292

					if (flags & DC_EXEC) {

   293

						SetTileOwner(tile, _current_player);

   294

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

   295

						_m[tile].m3 |= p1;

   296

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

   297

					}

   298

					break;

   299

   300

				case 0x20: // rail already there

   301

					return_cmd_error(STR_1007_ALREADY_BUILT);

   302

   303

				default:

   304

					// Get detailed error message

   305

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

   306

			}

   307

			break;

   308

   309

		case MP_RAILWAY:

   310

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

   311

					!EnsureNoVehicle(tile)) {

   312

				return CMD_ERROR;

   313

			}

   314

			if (m5 & RAIL_TYPE_SPECIAL ||

   315

					!IsTileOwner(tile, _current_player) ||

   316

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

   317

				// Get detailed error message

   318

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

   319

			}

   320

   321

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

   322

			if (CmdFailed(ret)) return ret;

   323

			cost += ret;

   324

   325

			if (flags & DC_EXEC) {

   326

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

   327

				_m[tile].m5 = m5 | trackbit;

   328

			}

   329

			break;

   330

   331

		case MP_STREET:

   332

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

   333

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   334

			if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   335

   336

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

   337

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

   338

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

   339

					)) {

   340

				if (flags & DC_EXEC) {

   341

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

   342

					SetTileOwner(tile, _current_player);

   343

					_m[tile].m4 = p1;

   344

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

   345

				}

   346

				break;

   347

			}

   348

   349

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

   350

				return_cmd_error(STR_1007_ALREADY_BUILT);

   351

			/* FALLTHROUGH */

   352

   353

		default:

   354

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

   355

			if (CmdFailed(ret)) return ret;

   356

			cost += ret;

   357

   358

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

   359

			if (CmdFailed(ret)) return ret;

   360

			cost += ret;

   361

   362

			if (flags & DC_EXEC) {

   363

				SetTileType(tile, MP_RAILWAY);

   364

				SetTileOwner(tile, _current_player);

   365

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

   366

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

   367

				_m[tile].m5 = trackbit;

   368

			}

   369

			break;

   370

	}

   371

   372

	if (flags & DC_EXEC) {

   373

		MarkTileDirtyByTile(tile);

   374

		SetSignalsOnBothDir(tile, track);

   375

	}

   376

   377

	return cost + _price.build_rail;

   378

}

   379

   380

static const byte _signals_table[] = {

   381

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

   382

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

   383

};

   384

   385

static const byte _signals_table_other[] = {

   386

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

   387

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

   388

};

   389

   390

static const byte _signals_table_both[] = {

   391

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

   392

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

   393

};

   394

   395

   396

/** Remove a single piece of track

   397

 * @param x,y coordinates for removal of track

   398

 * @param p1 unused

   399

 * @param p2 rail orientation

   400

 */

   401

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

   402

{

   403

	Track track = (Track)p2;

   404

	TrackBits trackbit;

   405

	uint tileh;

   406

	TileIndex tile;

   407

	byte m5;

   408

	int32 cost = _price.remove_rail;

   409

   410

	if (!ValParamTrackOrientation(p2)) return CMD_ERROR;

   411

	trackbit = TrackToTrackBits(track);

   412

   413

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   414

   415

	tile = TileVirtXY(x, y);

   416

	tileh = GetTileSlope(tile, NULL);

   417

   418

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

   419

		return CMD_ERROR;

   420

   421

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

   422

		return CMD_ERROR;

   423

   424

	// allow building rail under bridge

   425

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

   426

		return CMD_ERROR;

   427

   428

	switch(GetTileType(tile))

   429

	{

   430

		case MP_TUNNELBRIDGE:

   431

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

   432

				return CMD_ERROR;

   433

   434

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

   435

				return CMD_ERROR;

   436

   437

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

   438

				return CMD_ERROR;

   439

   440

			if (!(flags & DC_EXEC))

   441

				return _price.remove_rail;

   442

   443

		SetTileOwner(tile, OWNER_NONE);

   444

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

   445

			break;

   446

		case MP_STREET:

   447

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

   448

				return CMD_ERROR;

   449

   450

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

   451

				return CMD_ERROR;

   452

   453

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

   454

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

   455

				m5 = 5;

   456

				if (track != TRACK_DIAG1)

   457

					return CMD_ERROR;

   458

			} else {

   459

				m5 = 10;

   460

				if (track != TRACK_DIAG2)

   461

					return CMD_ERROR;

   462

			}

   463

   464

			if (!(flags & DC_EXEC))

   465

				return _price.remove_rail;

   466

   467

			_m[tile].m5 = m5;

   468

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

   469

			_m[tile].m2 = 0;

   470

			break;

   471

		case MP_RAILWAY:

   472

   473

			if (!IsPlainRailTile(tile))

   474

				return CMD_ERROR;

   475

   476

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

   477

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

   478

				return CMD_ERROR;

   479

   480

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

   481

			if (HasSignalOnTrack(tile, track))

   482

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

   483

   484

			if (!(flags & DC_EXEC))

   485

				return cost;

   486

   487

			/* We remove the trackbit here. */

   488

			_m[tile].m5 &= ~trackbit;

   489

   490

			/* Unreserve track for PBS */

   491

			if (PBSTileReserved(tile) & trackbit)

   492

				PBSClearTrack(tile, track);

   493

   494

			if (GetTrackBits(tile)  == 0) {