1

#include "stdafx.h"

     2

#include "openttd.h"

     3

#include "debug.h"

     4

#include "table/sprites.h"

     5

#include "table/strings.h"

     6

#include "gfx.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 "waypoint.h"

    20

#include "rail.h"

    21

    22

extern uint16 _custom_sprites_base;

    23

    24

void ShowTrainDepotWindow(TileIndex tile);

    25

    26

/* Format of rail map5 byte.

    27

 * 00 abcdef  => Normal rail

    28

 * 01 abcdef  => Rail with signals

    29

 * 10 ??????  => Unused

    30

 * 11 ????dd  => Depot

    31

 *

    32

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

    33

 * value for each track is given.

    34

 */

    35

    36

/*         4

    37

 *     ---------

    38

 *    |\       /|

    39

 *    | \    1/ |

    40

 *    |  \   /  |

    41

 *    |   \ /   |

    42

 *  16|    \    |32

    43

 *    |   / \2  |

    44

 *    |  /   \  |

    45

 *    | /     \ |

    46

 *    |/       \|

    47

 *     ---------

    48

 *         8

    49

 */

    50

    51

    52

// Constants for lower part of Map2 byte.

    53

enum RailMap2Lower4 {

    54

	RAIL_MAP2LO_GROUND_MASK = 0xF,

    55

	RAIL_GROUND_BROWN = 0,

    56

	RAIL_GROUND_GREEN = 1,

    57

	RAIL_GROUND_FENCE_NW = 2,

    58

	RAIL_GROUND_FENCE_SE = 3,

    59

	RAIL_GROUND_FENCE_SENW = 4,

    60

	RAIL_GROUND_FENCE_NE = 5,

    61

	RAIL_GROUND_FENCE_SW = 6,

    62

	RAIL_GROUND_FENCE_NESW = 7,

    63

	RAIL_GROUND_FENCE_VERT1 = 8,

    64

	RAIL_GROUND_FENCE_VERT2 = 9,

    65

	RAIL_GROUND_FENCE_HORIZ1 = 10,

    66

	RAIL_GROUND_FENCE_HORIZ2 = 11,

    67

	RAIL_GROUND_ICE_DESERT = 12,

    68

};

    69

    70

    71

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

    72

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

    73

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

    74

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

    75

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

    76

 *				 similar for lower and right.

    77

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

    78

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

    79

 * MAP5:         00abcdef => rail

    80

 *               01abcdef => rail w/ signals

    81

 *               10uuuuuu => unused

    82

 *               11uuuudd => rail depot

    83

 */

    84

    85

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

    86

{

    87

	RailTileType type = GetRailTileType(tile);

    88

	TrackBits current; /* The current track layout */

    89

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

    90

	_error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;

    91

    92

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

    93

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

    94

    95

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

    96

	 * what tracks first */

    97

	current = GetTrackBits(tile);

    98

	future = current | to_build;

    99

   100

	/* Are we really building something new? */

   101

	if (current == future) {

   102

		/* Nothing new is being built */

   103

		_error_message = STR_1007_ALREADY_BUILT;

   104

		return false;

   105

	}

   106

   107

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

   108

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

   109

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

   110

		 * signals on the tile), check that */

   111

		return

   112

			future == (TRACK_BIT_UPPER | TRACK_BIT_LOWER) ||

   113

			future == (TRACK_BIT_LEFT  | TRACK_BIT_RIGHT);

   114

	} else {

   115

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

   116

		return true;

   117

	}

   118

}

   119

   120

   121

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

   122

   123

// set of normal ones

   124

{

   125

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

   126

	TRACK_BIT_RIGHT,

   127

	TRACK_BIT_UPPER,

   128

	TRACK_BIT_DIAG1,

   129

   130

	TRACK_BIT_LEFT,

   131

	0,

   132

	TRACK_BIT_DIAG2,

   133

	TRACK_BIT_LOWER,

   134

   135

	TRACK_BIT_LOWER,

   136

	TRACK_BIT_DIAG2,

   137

	0,

   138

	TRACK_BIT_LEFT,

   139

   140

	TRACK_BIT_DIAG1,

   141

	TRACK_BIT_UPPER,

   142

	TRACK_BIT_RIGHT,

   143

},

   144

   145

// allowed rail for an evenly raised platform

   146

{

   147

	0,

   148

	TRACK_BIT_LEFT,

   149

	TRACK_BIT_LOWER,

   150

	TRACK_BIT_DIAG2 | TRACK_BIT_LOWER | TRACK_BIT_LEFT,

   151

   152

	TRACK_BIT_RIGHT,

   153

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

   154

	TRACK_BIT_DIAG1 | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,

   155

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

   156

   157

	TRACK_BIT_UPPER,

   158

	TRACK_BIT_DIAG1 | TRACK_BIT_UPPER | TRACK_BIT_LEFT,

   159

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

   160

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

   161

   162

	TRACK_BIT_DIAG2 | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,

   163

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

   164

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

   165

},

   166

   167

// allowed rail on coast tile

   168

{

   169

	0,

   170

	TRACK_BIT_LEFT,

   171

	TRACK_BIT_LOWER,

   172

	TRACK_BIT_DIAG2|TRACK_BIT_LEFT|TRACK_BIT_LOWER,

   173

   174

	TRACK_BIT_RIGHT,

   175

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

   176

	TRACK_BIT_DIAG1|TRACK_BIT_RIGHT|TRACK_BIT_LOWER,

   177

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

   178

   179

	TRACK_BIT_UPPER,

   180

	TRACK_BIT_DIAG1|TRACK_BIT_LEFT|TRACK_BIT_UPPER,

   181

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

   182

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

   183

   184

	TRACK_BIT_DIAG2|TRACK_BIT_RIGHT|TRACK_BIT_UPPER,

   185

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

   186

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

   187

	},

   188

   189

	// valid railway crossings on slopes

   190

	{

   191

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

   192

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

   193

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

   194

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

   195

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

   196

	}

   197

};

   198

   199

uint GetRailFoundation(uint tileh, uint bits)

   200

{

   201

	int i;

   202

   203

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

   204

		return 0;

   205

   206

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

   207

		return tileh;

   208

   209

	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)))

   210

		return i + 15;

   211

   212

	return 0;

   213

}

   214

   215

//

   216

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

   217

{

   218

	// never allow building on top of steep tiles

   219

	if (!(tileh & 0x10)) {

   220

		rail_bits |= existing;

   221

   222

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

   223

		if (IsTileType(tile, MP_WATER) &&

   224

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

   225

			return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   226

		}

   227

   228

		// no special foundation

   229

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

   230

			return 0;

   231

   232

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

   233

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

   234

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

   235

				)) { // partly up

   236

			if (existing != 0) {

   237

				return 0;

   238

			} else if (!_patches.build_on_slopes ||

   239

					(_is_ai_player && !_patches.ainew_active)) {

   240

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   241

			} else {

   242

				return _price.terraform;

   243

			}

   244

		}

   245

	}

   246

	return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   247

}

   248

   249

/* Validate functions for rail building */

   250

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

   251

   252

/** Build a single piece of rail

   253

 * @param x,y coordinates on where to build

   254

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

   255

 * @param p2 rail track to build

   256

 */

   257

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

   258

{

   259

	TileIndex tile;

   260

	uint tileh;

   261

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

   262

	Track track = (Track)p2;

   263

	TrackBits trackbit;

   264

	int32 cost = 0;

   265

	int32 ret;

   266

   267

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

   268

   269

	tile = TileVirtXY(x, y);

   270

	tileh = GetTileSlope(tile, NULL);

   271

	m5 = _map5[tile];

   272

	trackbit = TrackToTrackBits(track);

   273

   274

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   275

   276

	switch (GetTileType(tile)) {

   277

		case MP_TUNNELBRIDGE:

   278

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

   279

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

   280

				// Get detailed error message

   281

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

   282

			}

   283

   284

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

   285

				case 0x00: // clear land

   286

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

   287

					if (CmdFailed(ret)) return ret;

   288

					cost += ret;

   289

   290

					if (flags & DC_EXEC) {

   291

						SetTileOwner(tile, _current_player);

   292

						_map3_lo[tile] &= ~0x0F;

   293

						_map3_lo[tile] |= p1;

   294

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

   295

					}

   296

					break;

   297

   298

				case 0x20: // rail already there

   299

					return_cmd_error(STR_1007_ALREADY_BUILT);

   300

   301

				default:

   302

					// Get detailed error message

   303

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

   304

			}

   305

			break;

   306

   307

		case MP_RAILWAY:

   308

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

   309

					!EnsureNoVehicle(tile)) {

   310

				return CMD_ERROR;

   311

			}

   312

			if (m5 & RAIL_TYPE_SPECIAL ||

   313

					!IsTileOwner(tile, _current_player) ||

   314

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

   315

				// Get detailed error message

   316

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

   317

			}

   318

   319

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

   320

			if (CmdFailed(ret)) return ret;

   321

			cost += ret;

   322

   323

			if (flags & DC_EXEC) {

   324

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

   325

				_map5[tile] = m5 | trackbit;

   326

			}

   327

			break;

   328

   329

		case MP_STREET:

   330

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

   331

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   332

			if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   333

   334

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

   335

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

   336

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

   337

					)) {

   338

				if (flags & DC_EXEC) {

   339

					_map3_lo[tile] = GetTileOwner(tile);

   340

					SetTileOwner(tile, _current_player);

   341

					_map3_hi[tile] = p1;

   342

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

   343

				}

   344

				break;

   345

			}

   346

   347

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

   348

				return_cmd_error(STR_1007_ALREADY_BUILT);

   349

			/* FALLTHROUGH */

   350

   351

		default:

   352

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

   353

			if (CmdFailed(ret)) return ret;

   354

			cost += ret;

   355

   356

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

   357

			if (CmdFailed(ret)) return ret;

   358

			cost += ret;

   359

   360

			if (flags & DC_EXEC) {

   361

				SetTileType(tile, MP_RAILWAY);

   362

				SetTileOwner(tile, _current_player);

   363

				_map2[tile] = 0; // Bare land

   364

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

   365

				_map5[tile] = trackbit;

   366

			}

   367

			break;

   368

	}

   369

   370

	if (flags & DC_EXEC) {

   371

		MarkTileDirtyByTile(tile);

   372

		SetSignalsOnBothDir(tile, track);

   373

	}

   374

   375

	return cost + _price.build_rail;

   376

}

   377

   378

static const byte _signals_table[] = {

   379

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

   380

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

   381

};

   382

   383

static const byte _signals_table_other[] = {

   384

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

   385

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

   386

};

   387

   388

static const byte _signals_table_both[] = {

   389

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

   390

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

   391

};

   392

   393

   394

/** Remove a single piece of track

   395

 * @param x,y coordinates for removal of track

   396

 * @param p1 unused

   397

 * @param p2 rail orientation

   398

 */

   399

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

   400

{

   401

	Track track = (Track)p2;

   402

	TrackBits trackbit;

   403

	uint tileh;

   404

	TileIndex tile;

   405

	byte m5;

   406

	int32 cost = _price.remove_rail;

   407

   408

	if (!ValParamTrackOrientation(p2)) return CMD_ERROR;

   409

	trackbit = TrackToTrackBits(track);

   410

   411

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   412

   413

	tile = TileVirtXY(x, y);

   414

	tileh = GetTileSlope(tile, NULL);

   415

   416

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

   417

		return CMD_ERROR;

   418

   419

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

   420

		return CMD_ERROR;

   421

   422

	// allow building rail under bridge

   423

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

   424

		return CMD_ERROR;

   425

   426

	switch(GetTileType(tile))

   427

	{

   428

		case MP_TUNNELBRIDGE:

   429

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

   430

				return CMD_ERROR;

   431

   432

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

   433

				return CMD_ERROR;

   434

   435

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

   436

				return CMD_ERROR;

   437

   438

			if (!(flags & DC_EXEC))

   439

				return _price.remove_rail;

   440

   441

		SetTileOwner(tile, OWNER_NONE);

   442

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

   443

			break;

   444

		case MP_STREET:

   445

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

   446

				return CMD_ERROR;

   447

   448

			if (_map5[tile] & 0xE0)

   449

				return CMD_ERROR;

   450

   451

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

   452

			if (_map5[tile] & 8) {

   453

				m5 = 5;

   454

				if (track != TRACK_DIAG1)

   455

					return CMD_ERROR;

   456

			} else {

   457

				m5 = 10;

   458

				if (track != TRACK_DIAG2)

   459

					return CMD_ERROR;

   460

			}

   461

   462

			if (!(flags & DC_EXEC))

   463

				return _price.remove_rail;

   464

   465

			_map5[tile] = m5;

   466

			SetTileOwner(tile, _map3_lo[tile]);

   467

			_map2[tile] = 0;

   468

			break;

   469

		case MP_RAILWAY:

   470

   471

			if (!IsPlainRailTile(tile))

   472

				return CMD_ERROR;

   473

   474

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

   475

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

   476

				return CMD_ERROR;

   477

   478

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

   479

			if (HasSignalOnTrack(tile, track))

   480

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

   481

   482

			if (!(flags & DC_EXEC))

   483

				return cost;

   484

   485

			/* We remove the trackbit here. */

   486

			_map5[tile] &= ~trackbit;

   487

   488

			if (GetTrackBits(tile)  == 0) {

   489

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

   490

				DoClearSquare(tile);

   491

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

   492

				goto skip_mark_dirty;

   493

			}

   494

			break;

   495

		default: