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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 "landscape.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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    39

const byte _track_sloped_sprites[14] = {

    40

	14, 15, 22, 13,

    41

	 0, 21, 17, 12,

    42

	23,  0, 18, 20,

    43

	19, 16

    44

};

    45

    46

    47

/*         4

    48

 *     ---------

    49

 *    |\       /|

    50

 *    | \    1/ |

    51

 *    |  \   /  |

    52

 *    |   \ /   |

    53

 *  16|    \    |32

    54

 *    |   / \2  |

    55

 *    |  /   \  |

    56

 *    | /     \ |

    57

 *    |/       \|

    58

 *     ---------

    59

 *         8

    60

 */

    61

    62

    63

    64

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

    65

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

    66

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

    67

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

    68

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

    69

 *               similar for lower and right.

    70

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

    71

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

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 * MAP5:         00abcdef => rail

    73

 *               01abcdef => rail w/ signals

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 *               10uuuuuu => unused

    75

 *               11uuuudd => rail depot

    76

 */

    77

    78

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

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{

    80

	TrackBits current; /* The current track layout */

    81

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

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	_error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;

    83

    84

	if (!IsPlainRailTile(tile)) return false;

    85

    86

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

    87

	 * what tracks first */

    88

	current = GetTrackBits(tile);

    89

	future = current | to_build;

    90

    91

	/* Are we really building something new? */

    92

	if (current == future) {

    93

		/* Nothing new is being built */

    94

		_error_message = STR_1007_ALREADY_BUILT;

    95

		return false;

    96

	}

    97

    98

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

    99

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

   100

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

   101

		 * signals on the tile), check that */

   102

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

   103

	} else {

   104

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

   105

		return true;

   106

	}

   107

}

   108

   109

   110

static const TrackBits _valid_tileh_slopes[][15] = {

   111

   112

// set of normal ones

   113

{

   114

	TRACK_BIT_ALL,

   115

	TRACK_BIT_RIGHT,

   116

	TRACK_BIT_UPPER,

   117

	TRACK_BIT_X,

   118

   119

	TRACK_BIT_LEFT,

   120

	TRACK_BIT_NONE,

   121

	TRACK_BIT_Y,

   122

	TRACK_BIT_LOWER,

   123

   124

	TRACK_BIT_LOWER,

   125

	TRACK_BIT_Y,

   126

	TRACK_BIT_NONE,

   127

	TRACK_BIT_LEFT,

   128

   129

	TRACK_BIT_X,

   130

	TRACK_BIT_UPPER,

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	TRACK_BIT_RIGHT,

   132

},

   133

   134

// allowed rail for an evenly raised platform

   135

{

   136

	TRACK_BIT_NONE,

   137

	TRACK_BIT_LEFT,

   138

	TRACK_BIT_LOWER,

   139

	TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,

   140

   141

	TRACK_BIT_RIGHT,

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	TRACK_BIT_ALL,

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	TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,

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	TRACK_BIT_ALL,

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   146

	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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   151

	TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,

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	TRACK_BIT_ALL,

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	TRACK_BIT_ALL

   154

}

   155

};

   156

   157

uint GetRailFoundation(Slope tileh, TrackBits bits)

   158

{

   159

	uint i;

   160

   161

	if (!IsSteepSlope(tileh)) {

   162

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

   163

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

   164

	}

   165

   166

	switch (bits) {

   167

		default: NOT_REACHED();

   168

		case TRACK_BIT_X: i = 0; break;

   169

		case TRACK_BIT_Y: i = 1; break;

   170

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

   171

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

   172

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

   173

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

   174

	}

   175

	switch (tileh) {

   176

		case SLOPE_W:

   177

		case SLOPE_STEEP_W: i += 0; break;

   178

		case SLOPE_S:

   179

		case SLOPE_STEEP_S: i += 2; break;

   180

		case SLOPE_E:

   181

		case SLOPE_STEEP_E: i += 4; break;

   182

		case SLOPE_N:

   183

		case SLOPE_STEEP_N: i += 6; break;

   184

		default: return 0;

   185

	}

   186

	return i + 15;

   187

}

   188

   189

   190

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

   191

{

   192

	if (IsSteepSlope(tileh)) {

   193

		if (existing == 0) {

   194

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

   195

			if (valid & rail_bits) return _price.terraform;

   196

		}

   197

	} else {

   198

		rail_bits |= existing;

   199

   200

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

   201

		if (IsTileType(tile, MP_WATER) &&

   202

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

   203

			return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   204

		}

   205

   206

		// no special foundation

   207

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

   208

			return 0;

   209

   210

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

   211

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

   212

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

   213

				)) { // partly up

   214

			if (existing != 0) {

   215

				return 0;

   216

			} else if (!_patches.build_on_slopes) {

   217

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   218

			} else {

   219

				return _price.terraform;

   220

			}

   221

		}

   222

	}

   223

	return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   224

}

   225

   226

/* Validate functions for rail building */

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

   228

   229

/** Build a single piece of rail

   230

 * @param tile tile  to build on

   231

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

   232

 * @param p2 rail track to build

   233

 */

   234

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

   235

{

   236

	Slope tileh;

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	RailType railtype;

   238

	Track track;

   239

	TrackBits trackbit;

   240

	int32 cost = 0;

   241

	int32 ret;

   242

   243

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

   244

	railtype = (RailType)p1;

   245

	track = (Track)p2;

   246

   247

	tileh = GetTileSlope(tile, NULL);

   248

	trackbit = TrackToTrackBits(track);

   249

   250

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   251

   252

	switch (GetTileType(tile)) {

   253

		case MP_RAILWAY:

   254

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

   255

					!EnsureNoVehicle(tile)) {

   256

				return CMD_ERROR;

   257

			}

   258

			if (!IsTileOwner(tile, _current_player) ||

   259

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

   260

				// Get detailed error message

   261

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

   262

			}

   263

   264

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

   265

			if (CmdFailed(ret)) return ret;

   266

			cost += ret;

   267

   268

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

   269

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

   270

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

   271

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

   272

				if (CmdFailed(ret)) return ret;

   273

				cost += ret;

   274

			}

   275

   276

			if (flags & DC_EXEC) {

   277

				SetRailGroundType(tile, RAIL_GROUND_BARREN);

   278

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

   279

			}

   280

			break;

   281

   282

		case MP_STREET:

   283

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

   284

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

   285

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

   286

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   287

			}

   288

#undef M

   289

   290

			if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   291

   292

			if (GetRoadTileType(tile) == ROAD_TILE_NORMAL) {

   293

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

   294

   295

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

   296

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

   297

					if (flags & DC_EXEC) {

   298

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

   299

					}

   300

					break;

   301

				}

   302

			}

   303

   304

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

   305

				return_cmd_error(STR_1007_ALREADY_BUILT);

   306

			}

   307

			/* FALLTHROUGH */

   308

   309

		default:

   310

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

   311

			if (CmdFailed(ret)) return ret;

   312

			cost += ret;

   313

   314

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

   315

			if (CmdFailed(ret)) return ret;

   316

			cost += ret;

   317

   318

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

   319

			break;

   320

	}

   321

   322

	if (flags & DC_EXEC) {

   323

		MarkTileDirtyByTile(tile);

   324

		SetSignalsOnBothDir(tile, track);

   325

		YapfNotifyTrackLayoutChange(tile, track);

   326

	}

   327

   328

	return cost + _price.build_rail;

   329

}

   330

   331

/** Remove a single piece of track

   332

 * @param tile tile to remove track from

   333

 * @param p1 unused

   334

 * @param p2 rail orientation

   335

 */

   336

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

   337

{

   338

	Track track = (Track)p2;

   339

	TrackBits trackbit;

   340

	int32 cost = _price.remove_rail;

   341

	bool crossing = false;

   342

   343

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

   344

	trackbit = TrackToTrackBits(track);

   345

   346

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   347

   348

	switch (GetTileType(tile)) {

   349

		case MP_STREET: {

   350

			if (!IsLevelCrossing(tile) ||

   351

					GetCrossingRailBits(tile) != trackbit ||

   352

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

   353

					!EnsureNoVehicle(tile)) {

   354

				return CMD_ERROR;

   355

			}

   356

   357

			if (flags & DC_EXEC) {

   358

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

   359

			}

   360

			break;

   361

		}

   362

   363

		case MP_RAILWAY: {

   364

			TrackBits present;

   365

   366

			if (!IsPlainRailTile(tile) ||

   367

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

   368

					!EnsureNoVehicle(tile)) {

   369

				return CMD_ERROR;

   370

			}

   371

   372

			present = GetTrackBits(tile);

   373

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

   374

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

   375

   376

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

   377

			if (HasSignalOnTrack(tile, track))

   378

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

   379

   380

			if (flags & DC_EXEC) {

   381

				present ^= trackbit;

   382

				if (present == 0) {

   383

					DoClearSquare(tile);

   384

				} else {

   385

					SetTrackBits(tile, present);

   386

				}

   387

			}

   388

			break;

   389

		}

   390

   391

		default: return CMD_ERROR;

   392

	}

   393

   394

	if (flags & DC_EXEC) {

   395

		MarkTileDirtyByTile(tile);

   396

		if (crossing) {

   397

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

   398

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

   399

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

   400

			 * 'connect' with the other piece. */

   401

			SetSignalsOnBothDir(tile, TRACK_X);

   402

			SetSignalsOnBothDir(tile, TRACK_Y);

   403

			YapfNotifyTrackLayoutChange(tile, TRACK_X);

   404

			YapfNotifyTrackLayoutChange(tile, TRACK_Y);

   405

		} else {

   406

			SetSignalsOnBothDir(tile, track);

   407

			YapfNotifyTrackLayoutChange(tile, track);

   408

		}

   409

	}

   410

   411

	return cost;

   412

}

   413

   414

   415

static const TileIndexDiffC _trackdelta[] = {

   416

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

   417

	{  0,  0 },

   418

	{  0,  0 },

   419

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

   420

	{  0,  0 },

   421

	{  0,  0 }

   422

};

   423

   424

   425

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

   426

{

   427

	int x = TileX(start);

   428

	int y = TileY(start);

   429

	int ex = TileX(end);

   430

	int ey = TileY(end);

   431

	int dx, dy, trdx, trdy;

   432

   433

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

   434

   435

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

   436

	dx = ex - x;

   437

	dy = ey - y;

   438

   439

	// calculate delta x,y for the first direction

   440

	trdx = _trackdelta[*trackdir].x;

   441

	trdy = _trackdelta[*trackdir].y;

   442

   443

	if (!IsDiagonalTrackdir(*trackdir)) {

   444

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

   445

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

   446

	}

   447

   448

	// validate the direction

   449

	while (

   450

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

   451

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

   452

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

   453

		(trdy >= 0 && dy < 0)

   454

	) {

   455

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

   456

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

   457

			trdx = -trdx;

   458

			trdy = -trdy;

   459

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

   460

			return CMD_ERROR;

   461

		}

   462

	}

   463

   464

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

   465

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

   466

	if (!IsDiagonalTrackdir(*trackdir)) {

   467

		trdx = _trackdelta[*trackdir].x;

   468

		trdy = _trackdelta[*trackdir].y;

   469

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

   470

			return CMD_ERROR;

   471

	}

   472

   473

	return 0;

   474

}

   475

   476

/** Build a stretch of railroad tracks.

   477

 * @param tile start tile of drag

   478

 * @param p1 end tile of drag

   479

 * @param p2 various bitstuffed elements

   480

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

   481

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

   482

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

   483

 */

   484

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

   485

{