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/* $Id$ */

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#include "stdafx.h"

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#include "openttd.h"

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#include "bridge_map.h"

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#include "bridge.h"

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#include "cmd_helper.h"

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#include "debug.h"

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#include "functions.h"

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#include "rail_map.h"

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#include "road_map.h"

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#include "table/sprites.h"

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#include "table/strings.h"

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#include "map.h"

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#include "tile.h"

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#include "town_map.h"

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#include "tunnel_map.h"

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#include "vehicle.h"

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#include "viewport.h"

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#include "command.h"

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#include "pathfind.h"

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#include "engine.h"

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#include "town.h"

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#include "sound.h"

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#include "station.h"

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#include "sprite.h"

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#include "depot.h"

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#include "waypoint.h"

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#include "window.h"

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#include "rail.h"

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#include "railtypes.h" // include table for railtypes

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#include "newgrf.h"

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#include "yapf/yapf.h"

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#include "newgrf_callbacks.h"

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#include "newgrf_station.h"

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#include "train.h"

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    38

const byte _track_sloped_sprites[14] = {

    39

	14, 15, 22, 13,

    40

	 0, 21, 17, 12,

    41

	23,  0, 18, 20,

    42

	19, 16

    43

};

    44

    45

    46

/*         4

    47

 *     ---------

    48

 *    |\       /|

    49

 *    | \    1/ |

    50

 *    |  \   /  |

    51

 *    |   \ /   |

    52

 *  16|    \    |32

    53

 *    |   / \2  |

    54

 *    |  /   \  |

    55

 *    | /     \ |

    56

 *    |/       \|

    57

 *     ---------

    58

 *         8

    59

 */

    60

    61

    62

    63

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

    64

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

    65

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

    66

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

    67

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

    68

 *               similar for lower and right.

    69

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

    70

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

    71

 * MAP5:         00abcdef => rail

    72

 *               01abcdef => rail w/ signals

    73

 *               10uuuuuu => unused

    74

 *               11uuuudd => rail depot

    75

 */

    76

    77

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

    78

{

    79

	TrackBits current; /* The current track layout */

    80

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

    81

	_error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;

    82

    83

	if (!IsPlainRailTile(tile)) return false;

    84

    85

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

    86

	 * what tracks first */

    87

	current = GetTrackBits(tile);

    88

	future = current | to_build;

    89

    90

	/* Are we really building something new? */

    91

	if (current == future) {

    92

		/* Nothing new is being built */

    93

		_error_message = STR_1007_ALREADY_BUILT;

    94

		return false;

    95

	}

    96

    97

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

    98

	if (flags & DC_NO_RAIL_OVERLAP || HasSignals(tile)) {

    99

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

   100

		 * signals on the tile), check that */

   101

		return future == TRACK_BIT_HORZ || future == TRACK_BIT_VERT;

   102

	} else {

   103

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

   104

		return true;

   105

	}

   106

}

   107

   108

   109

static const TrackBits _valid_tileh_slopes[][15] = {

   110

   111

// set of normal ones

   112

{

   113

	TRACK_BIT_ALL,

   114

	TRACK_BIT_RIGHT,

   115

	TRACK_BIT_UPPER,

   116

	TRACK_BIT_X,

   117

   118

	TRACK_BIT_LEFT,

   119

	TRACK_BIT_NONE,

   120

	TRACK_BIT_Y,

   121

	TRACK_BIT_LOWER,

   122

   123

	TRACK_BIT_LOWER,

   124

	TRACK_BIT_Y,

   125

	TRACK_BIT_NONE,

   126

	TRACK_BIT_LEFT,

   127

   128

	TRACK_BIT_X,

   129

	TRACK_BIT_UPPER,

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	TRACK_BIT_RIGHT,

   131

},

   132

   133

// allowed rail for an evenly raised platform

   134

{

   135

	TRACK_BIT_NONE,

   136

	TRACK_BIT_LEFT,

   137

	TRACK_BIT_LOWER,

   138

	TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,

   139

   140

	TRACK_BIT_RIGHT,

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	TRACK_BIT_ALL,

   142

	TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,

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	TRACK_BIT_ALL,

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   145

	TRACK_BIT_UPPER,

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	TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,

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	TRACK_BIT_ALL,

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	TRACK_BIT_ALL,

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   150

	TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,

   151

	TRACK_BIT_ALL,

   152

	TRACK_BIT_ALL

   153

}

   154

};

   155

   156

uint GetRailFoundation(Slope tileh, TrackBits bits)

   157

{

   158

	uint i;

   159

   160

	if (!IsSteepSlope(tileh)) {

   161

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

   162

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

   163

	}

   164

   165

	switch (bits) {

   166

		default: NOT_REACHED();

   167

		case TRACK_BIT_X: i = 0; break;

   168

		case TRACK_BIT_Y: i = 1; break;

   169

		case TRACK_BIT_LEFT:  return 15 + 8 + (tileh == SLOPE_STEEP_W ? 4 : 0);

   170

		case TRACK_BIT_LOWER: return 15 + 8 + (tileh == SLOPE_STEEP_S ? 5 : 1);

   171

		case TRACK_BIT_RIGHT: return 15 + 8 + (tileh == SLOPE_STEEP_E ? 6 : 2);

   172

		case TRACK_BIT_UPPER: return 15 + 8 + (tileh == SLOPE_STEEP_N ? 7 : 3);

   173

	}

   174

	switch (tileh) {

   175

		case SLOPE_W:

   176

		case SLOPE_STEEP_W: i += 0; break;

   177

		case SLOPE_S:

   178

		case SLOPE_STEEP_S: i += 2; break;

   179

		case SLOPE_E:

   180

		case SLOPE_STEEP_E: i += 4; break;

   181

		case SLOPE_N:

   182

		case SLOPE_STEEP_N: i += 6; break;

   183

		default: return 0;

   184

	}

   185

	return i + 15;

   186

}

   187

   188

   189

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

   190

{

   191

	if (IsSteepSlope(tileh)) {

   192

		if (existing == 0) {

   193

			TrackBits valid = TRACK_BIT_CROSS | (HASBIT(1 << SLOPE_STEEP_W | 1 << SLOPE_STEEP_E, tileh) ? TRACK_BIT_VERT : TRACK_BIT_HORZ);

   194

			if (valid & rail_bits) return _price.terraform;

   195

		}

   196

	} else {

   197

		rail_bits |= existing;

   198

   199

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

   200

		if (IsTileType(tile, MP_WATER) &&

   201

				~_valid_tileh_slopes[1][tileh] & rail_bits) {

   202

			return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   203

		}

   204

   205

		// no special foundation

   206

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

   207

			return 0;

   208

   209

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

   210

					(rail_bits == TRACK_BIT_X || rail_bits == TRACK_BIT_Y) &&

   211

					(tileh == SLOPE_W || tileh == SLOPE_S || tileh == SLOPE_E || tileh == SLOPE_N)

   212

				)) { // partly up

   213

			if (existing != 0) {

   214

				return 0;

   215

			} else if (!_patches.build_on_slopes || _is_old_ai_player) {

   216

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   217

			} else {

   218

				return _price.terraform;

   219

			}

   220

		}

   221

	}

   222

	return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   223

}

   224

   225

/* Validate functions for rail building */

   226

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

   227

   228

/** Build a single piece of rail

   229

 * @param tile tile  to build on

   230

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

   231

 * @param p2 rail track to build

   232

 */

   233

int32 CmdBuildSingleRail(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)

   234

{

   235

	Slope tileh;

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	RailType railtype;

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	Track track;

   238

	TrackBits trackbit;

   239

	int32 cost = 0;

   240

	int32 ret;

   241

   242

	if (!ValParamRailtype(p1) || !ValParamTrackOrientation((Track)p2)) return CMD_ERROR;

   243

	railtype = (RailType)p1;

   244

	track = (Track)p2;

   245

   246

	tileh = GetTileSlope(tile, NULL);

   247

	trackbit = TrackToTrackBits(track);

   248

   249

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   250

   251

	switch (GetTileType(tile)) {

   252

		case MP_RAILWAY:

   253

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

   254

					!EnsureNoVehicle(tile)) {

   255

				return CMD_ERROR;

   256

			}

   257

			if (!IsTileOwner(tile, _current_player) ||

   258

					!IsCompatibleRail(GetRailType(tile), railtype)) {

   259

				// Get detailed error message

   260

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

   261

			}

   262

   263

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

   264

			if (CmdFailed(ret)) return ret;

   265

			cost += ret;

   266

   267

			/* If the rail types don't match, try to convert only if engines of

   268

			 * the present rail type are powered on the new rail type. */

   269

			if (GetRailType(tile) != railtype && HasPowerOnRail(GetRailType(tile), railtype)) {

   270

				ret = DoCommand(tile, tile, railtype, flags, CMD_CONVERT_RAIL);

   271

				if (CmdFailed(ret)) return ret;

   272

				cost += ret;

   273

			}

   274

   275

			if (flags & DC_EXEC) {

   276

				SetRailGroundType(tile, RAIL_GROUND_BARREN);

   277

				SetTrackBits(tile, GetTrackBits(tile) | trackbit);

   278

			}

   279

			break;

   280

   281

		case MP_STREET:

   282

#define M(x) (1 << (x))

   283

			/* Level crossings may only be built on these slopes */

   284

			if (!HASBIT(M(SLOPE_SEN) | M(SLOPE_ENW) | M(SLOPE_NWS) | M(SLOPE_NS) | M(SLOPE_WSE) | M(SLOPE_EW) | M(SLOPE_FLAT), tileh)) {

   285

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   286

			}

   287

#undef M

   288

   289

			if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   290

   291

			if (GetRoadTileType(tile) == ROAD_TILE_NORMAL) {

   292

				if (HasRoadWorks(tile)) return_cmd_error(STR_ROAD_WORKS_IN_PROGRESS);

   293

   294

				if ((track == TRACK_X && GetRoadBits(tile) == ROAD_Y) ||

   295

						(track == TRACK_Y && GetRoadBits(tile) == ROAD_X)) {

   296

					if (flags & DC_EXEC) {

   297

						MakeRoadCrossing(tile, GetTileOwner(tile), _current_player, (track == TRACK_X ? AXIS_Y : AXIS_X), railtype, GetTownIndex(tile));

   298

					}

   299

					break;

   300

				}

   301

			}

   302

   303

			if (IsLevelCrossing(tile) && GetCrossingRailBits(tile) == trackbit) {

   304

				return_cmd_error(STR_1007_ALREADY_BUILT);

   305

			}

   306

			/* FALLTHROUGH */

   307

   308

		default:

   309

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

   310

			if (CmdFailed(ret)) return ret;

   311

			cost += ret;

   312

   313

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

   314

			if (CmdFailed(ret)) return ret;

   315

			cost += ret;

   316

   317

			if (flags & DC_EXEC) MakeRailNormal(tile, _current_player, trackbit, railtype);

   318

			break;

   319

	}

   320

   321

	if (flags & DC_EXEC) {

   322

		MarkTileDirtyByTile(tile);

   323

		SetSignalsOnBothDir(tile, track);

   324

		YapfNotifyTrackLayoutChange(tile, track);

   325

	}

   326

   327

	return cost + _price.build_rail;

   328

}

   329

   330

/** Remove a single piece of track

   331

 * @param tile tile to remove track from

   332

 * @param p1 unused

   333

 * @param p2 rail orientation

   334

 */

   335

int32 CmdRemoveSingleRail(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)

   336

{

   337

	Track track = (Track)p2;

   338

	TrackBits trackbit;

   339

	int32 cost = _price.remove_rail;

   340

	bool crossing = false;

   341

   342

	if (!ValParamTrackOrientation((Track)p2)) return CMD_ERROR;

   343

	trackbit = TrackToTrackBits(track);

   344

   345

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   346

   347

	switch (GetTileType(tile)) {

   348

		case MP_STREET: {

   349

			if (!IsLevelCrossing(tile) ||

   350

					GetCrossingRailBits(tile) != trackbit ||

   351

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

   352

					!EnsureNoVehicle(tile)) {

   353

				return CMD_ERROR;

   354

			}

   355

   356

			if (flags & DC_EXEC) {

   357

				MakeRoadNormal(tile, GetCrossingRoadOwner(tile), GetCrossingRoadBits(tile), GetTownIndex(tile));

   358

			}

   359

			break;

   360

		}

   361

   362

		case MP_RAILWAY: {

   363

			TrackBits present;

   364

   365

			if (!IsPlainRailTile(tile) ||

   366

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

   367

					!EnsureNoVehicle(tile)) {

   368

				return CMD_ERROR;

   369

			}

   370

   371

			present = GetTrackBits(tile);

   372

			if ((present & trackbit) == 0) return CMD_ERROR;

   373

			if (present == (TRACK_BIT_X | TRACK_BIT_Y)) crossing = true;

   374

   375

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

   376

			if (HasSignalOnTrack(tile, track))

   377

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

   378

   379

			if (flags & DC_EXEC) {

   380

				present ^= trackbit;

   381

				if (present == 0) {

   382

					DoClearSquare(tile);

   383

				} else {

   384

					SetTrackBits(tile, present);

   385

				}

   386

			}

   387

			break;

   388

		}

   389

   390

		default: return CMD_ERROR;

   391

	}

   392

   393

	if (flags & DC_EXEC) {

   394

		MarkTileDirtyByTile(tile);

   395

		if (crossing) {

   396

			/* crossing is set when only TRACK_BIT_X and TRACK_BIT_Y are set. As we

   397

			 * are removing one of these pieces, we'll need to update signals for

   398

			 * both directions explicitly, as after the track is removed it won't

   399

			 * 'connect' with the other piece. */

   400

			SetSignalsOnBothDir(tile, TRACK_X);

   401

			SetSignalsOnBothDir(tile, TRACK_Y);

   402

			YapfNotifyTrackLayoutChange(tile, TRACK_X);

   403

			YapfNotifyTrackLayoutChange(tile, TRACK_Y);

   404

		} else {

   405

			SetSignalsOnBothDir(tile, track);

   406

			YapfNotifyTrackLayoutChange(tile, track);

   407

		}

   408

	}

   409

   410

	return cost;

   411

}

   412

   413

   414

static const TileIndexDiffC _trackdelta[] = {

   415

	{ -1,  0 }, {  0,  1 }, { -1,  0 }, {  0,  1 }, {  1,  0 }, {  0,  1 },

   416

	{  0,  0 },

   417

	{  0,  0 },

   418

	{  1,  0 }, {  0, -1 }, {  0, -1 }, {  1,  0 }, {  0, -1 }, { -1,  0 },

   419

	{  0,  0 },

   420

	{  0,  0 }

   421

};

   422

   423

   424

static int32 ValidateAutoDrag(Trackdir *trackdir, TileIndex start, TileIndex end)

   425

{

   426

	int x = TileX(start);

   427

	int y = TileY(start);

   428

	int ex = TileX(end);

   429

	int ey = TileY(end);

   430

	int dx, dy, trdx, trdy;

   431

   432

	if (!ValParamTrackOrientation(TrackdirToTrack(*trackdir))) return CMD_ERROR;

   433

   434

	// calculate delta x,y from start to end tile

   435

	dx = ex - x;

   436

	dy = ey - y;

   437

   438

	// calculate delta x,y for the first direction

   439

	trdx = _trackdelta[*trackdir].x;

   440

	trdy = _trackdelta[*trackdir].y;

   441

   442

	if (!IsDiagonalTrackdir(*trackdir)) {

   443

		trdx += _trackdelta[*trackdir ^ 1].x;

   444

		trdy += _trackdelta[*trackdir ^ 1].y;

   445

	}

   446

   447

	// validate the direction

   448

	while (

   449

		(trdx <= 0 && dx > 0) ||

   450

		(trdx >= 0 && dx < 0) ||

   451

		(trdy <= 0 && dy > 0) ||

   452

		(trdy >= 0 && dy < 0)

   453

	) {

   454

		if (!HASBIT(*trackdir, 3)) { // first direction is invalid, try the other

   455

			SetBitT(*trackdir, 3); // reverse the direction

   456

			trdx = -trdx;

   457

			trdy = -trdy;

   458

		} else { // other direction is invalid too, invalid drag

   459

			return CMD_ERROR;

   460

		}

   461

	}

   462

   463

	// (for diagonal tracks, this is already made sure of by above test), but:

   464

	// for non-diagonal tracks, check if the start and end tile are on 1 line

   465

	if (!IsDiagonalTrackdir(*trackdir)) {

   466

		trdx = _trackdelta[*trackdir].x;

   467

		trdy = _trackdelta[*trackdir].y;

   468

		if (abs(dx) != abs(dy) && abs(dx) + abs(trdy) != abs(dy) + abs(trdx))

   469

			return CMD_ERROR;

   470

	}

   471

   472

	return 0;

   473

}

   474

   475

/** Build a stretch of railroad tracks.

   476

 * @param tile start tile of drag

   477

 * @param p1 end tile of drag

   478

 * @param p2 various bitstuffed elements

   479

 * - p2 = (bit 0-3) - railroad type normal/maglev (0 = normal, 1 = mono, 2 = maglev)

   480

 * - p2 = (bit 4-6) - track-orientation, valid values: 0-5 (Track enum)

   481

 * - p2 = (bit 7)   - 0 = build, 1 = remove tracks

   482

 */

   483

static int32 CmdRailTrackHelper(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)

   484

{

   485

	int32 ret, total_cost = 0;

   486