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 "waypoint.h"

    19

#include "rail.h"

    20

    21

extern uint16 _custom_sprites_base;

    22

    23

void ShowTrainDepotWindow(TileIndex tile);

    24

    25

/* Format of rail map5 byte.

    26

 * 00 abcdef  => Normal rail

    27

 * 01 abcdef  => Rail with signals

    28

 * 10 ??????  => Unused

    29

 * 11 ????dd  => Depot

    30

 *

    31

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

    32

 * value for each track is given.

    33

 */

    34

    35

/*         4

    36

 *     ---------

    37

 *    |\       /|

    38

 *    | \    1/ |

    39

 *    |  \   /  |

    40

 *    |   \ /   |

    41

 *  16|    \    |32

    42

 *    |   / \2  |

    43

 *    |  /   \  |

    44

 *    | /     \ |

    45

 *    |/       \|

    46

 *     ---------

    47

 *         8

    48

 */

    49

    50

    51

// Constants for lower part of Map2 byte.

    52

enum RailMap2Lower4 {

    53

	RAIL_MAP2LO_GROUND_MASK = 0xF,

    54

	RAIL_GROUND_BROWN = 0,

    55

	RAIL_GROUND_GREEN = 1,

    56

	RAIL_GROUND_FENCE_NW = 2,

    57

	RAIL_GROUND_FENCE_SE = 3,

    58

	RAIL_GROUND_FENCE_SENW = 4,

    59

	RAIL_GROUND_FENCE_NE = 5,

    60

	RAIL_GROUND_FENCE_SW = 6,

    61

	RAIL_GROUND_FENCE_NESW = 7,

    62

	RAIL_GROUND_FENCE_VERT1 = 8,

    63

	RAIL_GROUND_FENCE_VERT2 = 9,

    64

	RAIL_GROUND_FENCE_HORIZ1 = 10,

    65

	RAIL_GROUND_FENCE_HORIZ2 = 11,

    66

	RAIL_GROUND_ICE_DESERT = 12,

    67

};

    68

    69

    70

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

    71

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

    72

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

    73

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

    74

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

    75

 *				 similar for lower and right.

    76

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

    77

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

    78

 * MAP5:         00abcdef => rail

    79

 *               01abcdef => rail w/ signals

    80

 *               10uuuuuu => unused

    81

 *               11uuuudd => rail depot

    82

 */

    83

    84

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

    85

{

    86

	RailTileType type = GetRailTileType(tile);

    87

	TrackBits current; /* The current track layout */

    88

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

    89

	_error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;

    90

    91

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

    92

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

    93

    94

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

    95

	 * what tracks first */

    96

	current = GetTrackBits(tile);

    97

	future = current | to_build;

    98

    99

	/* Are we really building something new? */

   100

	if (current == future) {

   101

		/* Nothing new is being built */

   102

		_error_message = STR_1007_ALREADY_BUILT;

   103

		return false;

   104

	}

   105

   106

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

   107

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

   108

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

   109

		 * signals on the tile), check that */

   110

		return

   111

			future == (TRACK_BIT_UPPER | TRACK_BIT_LOWER) ||

   112

			future == (TRACK_BIT_LEFT  | TRACK_BIT_RIGHT);

   113

	} else {

   114

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

   115

		return true;

   116

	}

   117

}

   118

   119

   120

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

   121

   122

// set of normal ones

   123

{

   124

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

   125

	TRACK_BIT_RIGHT,

   126

	TRACK_BIT_UPPER,

   127

	TRACK_BIT_DIAG1,

   128

   129

	TRACK_BIT_LEFT,

   130

	0,

   131

	TRACK_BIT_DIAG2,

   132

	TRACK_BIT_LOWER,

   133

   134

	TRACK_BIT_LOWER,

   135

	TRACK_BIT_DIAG2,

   136

	0,

   137

	TRACK_BIT_LEFT,

   138

   139

	TRACK_BIT_DIAG1,

   140

	TRACK_BIT_UPPER,

   141

	TRACK_BIT_RIGHT,

   142

},

   143

   144

// allowed rail for an evenly raised platform

   145

{

   146

	0,

   147

	TRACK_BIT_LEFT,

   148

	TRACK_BIT_LOWER,

   149

	TRACK_BIT_DIAG2 | TRACK_BIT_LOWER | TRACK_BIT_LEFT,

   150

   151

	TRACK_BIT_RIGHT,

   152

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

   153

	TRACK_BIT_DIAG1 | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,

   154

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

   155

   156

	TRACK_BIT_UPPER,

   157

	TRACK_BIT_DIAG1 | TRACK_BIT_UPPER | TRACK_BIT_LEFT,

   158

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

   159

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

   160

   161

	TRACK_BIT_DIAG2 | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,

   162

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

   163

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

   164

},

   165

   166

// allowed rail on coast tile

   167

{

   168

	0,

   169

	TRACK_BIT_LEFT,

   170

	TRACK_BIT_LOWER,

   171

	TRACK_BIT_DIAG2|TRACK_BIT_LEFT|TRACK_BIT_LOWER,

   172

   173

	TRACK_BIT_RIGHT,

   174

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

   175

	TRACK_BIT_DIAG1|TRACK_BIT_RIGHT|TRACK_BIT_LOWER,

   176

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

   177

   178

	TRACK_BIT_UPPER,

   179

	TRACK_BIT_DIAG1|TRACK_BIT_LEFT|TRACK_BIT_UPPER,

   180

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

   181

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

   182

   183

	TRACK_BIT_DIAG2|TRACK_BIT_RIGHT|TRACK_BIT_UPPER,

   184

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

   185

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

   186

	},

   187

   188

	// valid railway crossings on slopes

   189

	{

   190

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

   191

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

   192

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

   193

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

   194

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

   195

	}

   196

};

   197

   198

uint GetRailFoundation(uint tileh, uint bits)

   199

{

   200

	int i;

   201

   202

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

   203

		return 0;

   204

   205

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

   206

		return tileh;

   207

   208

	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)))

   209

		return i + 15;

   210

   211

	return 0;

   212

}

   213

   214

//

   215

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

   216

{

   217

	// never allow building on top of steep tiles

   218

	if (!(tileh & 0x10)) {

   219

		rail_bits |= existing;

   220

   221

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

   222

		if (IsTileType(tile, MP_WATER) &&

   223

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

   224

			return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   225

		}

   226

   227

		// no special foundation

   228

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

   229

			return 0;

   230

   231

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

   232

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

   233

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

   234

				)) { // partly up

   235

			if (existing != 0) {

   236

				return 0;

   237

			} else if (!_patches.build_on_slopes ||

   238

					(_is_ai_player && !_patches.ainew_active)) {

   239

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   240

			} else {

   241

				return _price.terraform;

   242

			}

   243

		}

   244

	}

   245

	return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   246

}

   247

   248

/* Validate functions for rail building */

   249

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

   250

   251

/** Build a single piece of rail

   252

 * @param x,y coordinates on where to build

   253

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

   254

 * @param p2 rail track to build

   255

 */

   256

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

   257

{

   258

	TileIndex tile;

   259

	uint tileh;

   260

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

   261

	Track track = (Track)p2;

   262

	TrackBits trackbit;

   263

	int32 cost = 0;

   264

	int32 ret;

   265

   266

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

   267

   268

	tile = TileVirtXY(x, y);

   269

	tileh = GetTileSlope(tile, NULL);

   270

	m5 = _map5[tile];

   271

	trackbit = TrackToTrackBits(track);

   272

   273

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   274

   275

	switch (GetTileType(tile)) {

   276

		case MP_TUNNELBRIDGE:

   277

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

   278

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

   279

				// Get detailed error message

   280

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

   281

			}

   282

   283

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

   284

				case 0x00: // clear land

   285

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

   286

					if (CmdFailed(ret)) return ret;

   287

					cost += ret;

   288

   289

					if (flags & DC_EXEC) {

   290

						SetTileOwner(tile, _current_player);

   291

						_map3_lo[tile] &= ~0x0F;

   292

						_map3_lo[tile] |= p1;

   293

						_map5[tile] = (m5 & 0xC7) | 0x20; // railroad under bridge

   294

					}

   295

					break;

   296

   297

				case 0x20: // rail already there

   298

					return_cmd_error(STR_1007_ALREADY_BUILT);

   299

   300

				default:

   301

					// Get detailed error message

   302

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

   303

			}

   304

			break;

   305

   306

		case MP_RAILWAY:

   307

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

   308

					!EnsureNoVehicle(tile)) {

   309

				return CMD_ERROR;

   310

			}

   311

			if (m5 & RAIL_TYPE_SPECIAL ||

   312

					!IsTileOwner(tile, _current_player) ||

   313

					(_map3_lo[tile] & 0xFU) != p1) {

   314

				// Get detailed error message

   315

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

   316

			}

   317

   318

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

   319

			if (CmdFailed(ret)) return ret;

   320

			cost += ret;

   321

   322

			if (flags & DC_EXEC) {

   323

				_map2[tile] &= ~RAIL_MAP2LO_GROUND_MASK; // Bare land

   324

				_map5[tile] = m5 | trackbit;

   325

			}

   326

			break;

   327

   328

		case MP_STREET:

   329

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

   330

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   331

			if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   332

   333

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

   334

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

   335

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

   336

					)) {

   337

				if (flags & DC_EXEC) {

   338

					_map3_lo[tile] = GetTileOwner(tile);

   339

					SetTileOwner(tile, _current_player);

   340

					_map3_hi[tile] = p1;

   341

					_map5[tile] = 0x10 | (track == TRACK_DIAG1 ? 0x08 : 0x00); // level crossing

   342

				}

   343

				break;

   344

			}

   345

   346

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

   347

				return_cmd_error(STR_1007_ALREADY_BUILT);

   348

			/* FALLTHROUGH */

   349

   350

		default:

   351

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

   352

			if (CmdFailed(ret)) return ret;

   353

			cost += ret;

   354

   355

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

   356

			if (CmdFailed(ret)) return ret;

   357

			cost += ret;

   358

   359

			if (flags & DC_EXEC) {

   360

				SetTileType(tile, MP_RAILWAY);

   361

				SetTileOwner(tile, _current_player);

   362

				_map2[tile] = 0; // Bare land

   363

				_map3_lo[tile] = p1; // No signals, rail type

   364

				_map5[tile] = trackbit;

   365

			}

   366

			break;

   367

	}

   368

   369

	if (flags & DC_EXEC) {

   370

		MarkTileDirtyByTile(tile);

   371

		SetSignalsOnBothDir(tile, track);

   372

	}

   373

   374

	return cost + _price.build_rail;

   375

}

   376

   377

static const byte _signals_table[] = {

   378

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

   379

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

   380

};

   381

   382

static const byte _signals_table_other[] = {

   383

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

   384

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

   385

};

   386

   387

static const byte _signals_table_both[] = {

   388

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

   389

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

   390

};

   391

   392

   393

/** Remove a single piece of track

   394

 * @param x,y coordinates for removal of track

   395

 * @param p1 unused

   396

 * @param p2 rail orientation

   397

 */

   398

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

   399

{

   400

	Track track = (Track)p2;

   401

	TrackBits trackbit;

   402

	uint tileh;

   403

	TileIndex tile;

   404

	byte m5;

   405

	int32 cost = _price.remove_rail;

   406

   407

	if (!ValParamTrackOrientation(p2)) return CMD_ERROR;

   408

	trackbit = TrackToTrackBits(track);

   409

   410

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   411

   412

	tile = TileVirtXY(x, y);

   413

	tileh = GetTileSlope(tile, NULL);

   414

   415

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

   416

		return CMD_ERROR;

   417

   418

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

   419

		return CMD_ERROR;

   420

   421

	// allow building rail under bridge

   422

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

   423

		return CMD_ERROR;

   424

   425

	switch(GetTileType(tile))

   426

	{

   427

		case MP_TUNNELBRIDGE:

   428

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

   429

				return CMD_ERROR;

   430

   431

			if ((_map5[tile] & 0xF8) != 0xE0)

   432

				return CMD_ERROR;

   433

   434

			if ( ((_map5[tile] & 1) ? 1 : 2) != trackbit )

   435

				return CMD_ERROR;

   436

   437

			if (!(flags & DC_EXEC))

   438

				return _price.remove_rail;

   439

   440

		SetTileOwner(tile, OWNER_NONE);

   441

			_map5[tile] = _map5[tile] & 0xC7;

   442

			break;

   443

		case MP_STREET:

   444

			if (!(_map5[tile] & 0xF0))

   445

				return CMD_ERROR;

   446

   447

			if (_map5[tile] & 0xE0)

   448

				return CMD_ERROR;

   449

   450

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

   451

			if (_map5[tile] & 8) {

   452

				m5 = 5;

   453

				if (track != TRACK_DIAG1)

   454

					return CMD_ERROR;

   455

			} else {

   456

				m5 = 10;

   457

				if (track != TRACK_DIAG2)

   458

					return CMD_ERROR;

   459

			}

   460

   461

			if (!(flags & DC_EXEC))

   462

				return _price.remove_rail;

   463

   464

			_map5[tile] = m5;

   465

			SetTileOwner(tile, _map3_lo[tile]);

   466

			_map2[tile] = 0;

   467

			break;

   468

		case MP_RAILWAY:

   469

   470

			if (!IsPlainRailTile(tile))

   471

				return CMD_ERROR;

   472

   473

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

   474

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

   475

				return CMD_ERROR;

   476

   477

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

   478

			if (HasSignalOnTrack(tile, track))

   479

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

   480

   481

			if (!(flags & DC_EXEC))

   482

				return cost;

   483

   484

			/* We remove the trackbit here. */

   485

			_map5[tile] &= ~trackbit;

   486

   487

			if (GetTrackBits(tile)  == 0) {

   488

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

   489

				DoClearSquare(tile);

   490

				/* XXX: This is an optimisation, right? Is it really worth the ugly goto? */

   491

				goto skip_mark_dirty;

   492

			}

   493

			break;

   494

		default:

   495

			assert(0);