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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 "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"

    10

#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 "rail.h"

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

    29

#include "newgrf.h"

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#include "newgrf_callbacks.h"

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#include "newgrf_station.h"

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    33

const byte _track_sloped_sprites[14] = {

    34

	14, 15, 22, 13,

    35

	 0, 21, 17, 12,

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	23,  0, 18, 20,

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	19, 16

    38

};

    39

    40

void ShowTrainDepotWindow(TileIndex tile);

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    42

/*         4

    43

 *     ---------

    44

 *    |\       /|

    45

 *    | \    1/ |

    46

 *    |  \   /  |

    47

 *    |   \ /   |

    48

 *  16|    \    |32

    49

 *    |   / \2  |

    50

 *    |  /   \  |

    51

 *    | /     \ |

    52

 *    |/       \|

    53

 *     ---------

    54

 *         8

    55

 */

    56

    57

    58

    59

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

    60

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

    61

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

    62

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

    63

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

    64

 *				 similar for lower and right.

    65

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

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

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 * MAP5:         00abcdef => rail

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 *               01abcdef => rail w/ signals

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 *               10uuuuuu => unused

    70

 *               11uuuudd => rail depot

    71

 */

    72

    73

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

    74

{

    75

	RailTileType type = GetRailTileType(tile);

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	TrackBits current; /* The current track layout */

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

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	_error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;

    79

    80

	if (type != RAIL_TILE_NORMAL && type != RAIL_TILE_SIGNALS)

    81

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

    82

    83

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

    84

	 * what tracks first */

    85

	current = GetTrackBits(tile);

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	future = current | to_build;

    87

    88

	/* Are we really building something new? */

    89

	if (current == future) {

    90

		/* Nothing new is being built */

    91

		_error_message = STR_1007_ALREADY_BUILT;

    92

		return false;

    93

	}

    94

    95

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

    96

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

    97

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

    98

		 * signals on the tile), check that */

    99

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

   100

	} else {

   101

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

   102

		return true;

   103

	}

   104

}

   105

   106

   107

const TrackBits _valid_tileh_slopes[2][15] = {

   108

   109

// set of normal ones

   110

{

   111

	TRACK_BIT_ALL,

   112

	TRACK_BIT_RIGHT,

   113

	TRACK_BIT_UPPER,

   114

	TRACK_BIT_X,

   115

   116

	TRACK_BIT_LEFT,

   117

	0,

   118

	TRACK_BIT_Y,

   119

	TRACK_BIT_LOWER,

   120

   121

	TRACK_BIT_LOWER,

   122

	TRACK_BIT_Y,

   123

	0,

   124

	TRACK_BIT_LEFT,

   125

   126

	TRACK_BIT_X,

   127

	TRACK_BIT_UPPER,

   128

	TRACK_BIT_RIGHT,

   129

},

   130

   131

// allowed rail for an evenly raised platform

   132

{

   133

	0,

   134

	TRACK_BIT_LEFT,

   135

	TRACK_BIT_LOWER,

   136

	TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,

   137

   138

	TRACK_BIT_RIGHT,

   139

	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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   143

	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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   148

	TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,

   149

	TRACK_BIT_ALL,

   150

	TRACK_BIT_ALL

   151

}

   152

};

   153

   154

uint GetRailFoundation(Slope tileh, TrackBits bits)

   155

{

   156

	uint i;

   157

   158

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

   159

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

   160

   161

	switch (bits) {

   162

		case TRACK_BIT_X: i = 0; break;

   163

		case TRACK_BIT_Y: i = 1; break;

   164

		default:          return 0;

   165

	}

   166

	switch (tileh) {

   167

		case SLOPE_W: i += 0; break;

   168

		case SLOPE_S: i += 2; break;

   169

		case SLOPE_E: i += 4; break;

   170

		case SLOPE_N: i += 6; break;

   171

		default:      return 0;

   172

	}

   173

	return i + 15;

   174

}

   175

   176

   177

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

   178

{

   179

	// never allow building on top of steep tiles

   180

	if (!IsSteepSlope(tileh)) {

   181

		rail_bits |= existing;

   182

   183

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

   184

		if (IsTileType(tile, MP_WATER) &&

   185

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

   186

			return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   187

		}

   188

   189

		// no special foundation

   190

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

   191

			return 0;

   192

   193

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

   194

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

   195

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

   196

				)) { // partly up

   197

			if (existing != 0) {

   198

				return 0;

   199

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

   200

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   201

			} else {

   202

				return _price.terraform;

   203

			}

   204

		}

   205

	}

   206

	return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   207

}

   208

   209

/* Validate functions for rail building */

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

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   212

/** Build a single piece of rail

   213

 * @param tile tile  to build on

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

   215

 * @param p2 rail track to build

   216

 */

   217

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

   218

{

   219

	Slope tileh;

   220

	Track track = (Track)p2;

   221

	TrackBits trackbit;

   222

	int32 cost = 0;

   223

	int32 ret;

   224

   225

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

   226

   227

	tileh = GetTileSlope(tile, NULL);

   228

	trackbit = TrackToTrackBits(track);

   229

   230

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   231

   232

	switch (GetTileType(tile)) {

   233

		case MP_TUNNELBRIDGE:

   234

			if (!IsBridge(tile) ||

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					!IsBridgeMiddle(tile) ||

   236

					(GetBridgeAxis(tile) == AXIS_X ? TRACK_BIT_Y : TRACK_BIT_X) != trackbit) {

   237

				// Get detailed error message

   238

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

   239

			}

   240

   241

			if (IsClearUnderBridge(tile)) {

   242

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

   243

				if (CmdFailed(ret)) return ret;

   244

				cost += ret;

   245

   246

				if (flags & DC_EXEC) SetRailUnderBridge(tile, _current_player, p1);

   247

			} else if (IsTransportUnderBridge(tile) &&

   248

					GetTransportTypeUnderBridge(tile) == TRANSPORT_RAIL) {

   249

				return_cmd_error(STR_1007_ALREADY_BUILT);

   250

			} else {

   251

				// Get detailed error message

   252

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

   253

			}

   254

			break;

   255

   256

		case MP_RAILWAY:

   257

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

   258

					!EnsureNoVehicle(tile)) {

   259

				return CMD_ERROR;

   260

			}

   261

			if (GetRailTileType(tile) == RAIL_TILE_DEPOT_WAYPOINT ||

   262

					!IsTileOwner(tile, _current_player) ||

   263

					GetRailType(tile) != p1) {

   264

				// Get detailed error message

   265

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

   266

			}

   267

   268

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

   269

			if (CmdFailed(ret)) return ret;

   270

			cost += ret;

   271

   272

			if (flags & DC_EXEC) {

   273

				SetRailGroundType(tile, RAIL_GROUND_BARREN);

   274

				_m[tile].m5 |= trackbit;

   275

			}

   276

			break;

   277

   278

		case MP_STREET:

   279

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

   280

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

   281

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

   282

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   283

			}

   284

#undef M

   285

   286

			if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   287

   288

			if (GetRoadTileType(tile) == ROAD_TILE_NORMAL && (

   289

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

   290

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

   291

					)) {

   292

				if (flags & DC_EXEC) {

   293

					MakeRoadCrossing(tile, GetTileOwner(tile), _current_player, (track == TRACK_X ? AXIS_Y : AXIS_X), p1, GetTownIndex(tile));

   294

				}

   295

				break;

   296

			}

   297

   298

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

   299

				return_cmd_error(STR_1007_ALREADY_BUILT);

   300

			}

   301

			/* FALLTHROUGH */

   302

   303

		default:

   304

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

   305

			if (CmdFailed(ret)) return ret;

   306

			cost += ret;

   307

   308

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

   309

			if (CmdFailed(ret)) return ret;

   310

			cost += ret;

   311

   312

			if (flags & DC_EXEC) MakeRailNormal(tile, _current_player, trackbit, p1);

   313

			break;

   314

	}

   315

   316

	if (flags & DC_EXEC) {

   317

		MarkTileDirtyByTile(tile);

   318

		SetSignalsOnBothDir(tile, track);

   319

	}

   320

   321

	return cost + _price.build_rail;

   322

}

   323

   324

/** Remove a single piece of track

   325

 * @param tile tile to remove track from

   326

 * @param p1 unused

   327

 * @param p2 rail orientation

   328

 */

   329

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

   330

{

   331

	Track track = (Track)p2;

   332

	TrackBits trackbit;

   333

	int32 cost = _price.remove_rail;

   334

	bool crossing = false;

   335

   336

	if (!ValParamTrackOrientation(p2)) return CMD_ERROR;

   337

	trackbit = TrackToTrackBits(track);

   338

   339

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   340

   341

	switch (GetTileType(tile)) {

   342

		case MP_TUNNELBRIDGE:

   343

			if (!IsBridge(tile) ||

   344

					!IsBridgeMiddle(tile) ||

   345

					!IsTransportUnderBridge(tile) ||

   346

					GetTransportTypeUnderBridge(tile) != TRANSPORT_RAIL ||

   347

					GetRailBitsUnderBridge(tile) != trackbit ||

   348

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

   349

					!EnsureNoVehicleOnGround(tile)) {

   350

				return CMD_ERROR;

   351

			}

   352

   353

			if (flags & DC_EXEC) SetClearUnderBridge(tile);

   354

			break;

   355

   356

		case MP_STREET: {

   357

			if (!IsLevelCrossing(tile) ||

   358

					GetCrossingRailBits(tile) != trackbit ||

   359

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

   360

					!EnsureNoVehicle(tile)) {

   361

				return CMD_ERROR;

   362

			}

   363

   364

			if (flags & DC_EXEC) {

   365

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

   366

			}

   367

			break;

   368

		}

   369

   370

		case MP_RAILWAY: {

   371

			TrackBits present;

   372

   373

			if (!IsPlainRailTile(tile) ||

   374

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

   375

					!EnsureNoVehicle(tile)) {

   376

				return CMD_ERROR;

   377

			}

   378

   379

			present = GetTrackBits(tile);

   380

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

   381

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

   382

   383

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

   384

			if (HasSignalOnTrack(tile, track))

   385

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

   386

   387

			if (flags & DC_EXEC) {

   388

				present ^= trackbit;

   389

				if (present == 0) {

   390

					DoClearSquare(tile);

   391

				} else {

   392

					SetTrackBits(tile, present);

   393

				}

   394

			}

   395

			break;

   396

		}

   397

   398

		default: return CMD_ERROR;

   399

	}

   400

   401

	if (flags & DC_EXEC) {

   402

		MarkTileDirtyByTile(tile);

   403

		if (crossing) {

   404

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

   405

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

   406

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

   407

			 * 'connect' with the other piece. */

   408

			SetSignalsOnBothDir(tile, TRACK_X);

   409

			SetSignalsOnBothDir(tile, TRACK_Y);

   410

		} else {

   411

			SetSignalsOnBothDir(tile, track);

   412

		}

   413

	}

   414

   415

	return cost;

   416

}

   417

   418

   419

static const TileIndexDiffC _trackdelta[] = {

   420

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

   421

	{  0,  0 },

   422

	{  0,  0 },

   423

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

   424

	{  0,  0 },

   425

	{  0,  0 }

   426

};

   427

   428

   429

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

   430

{

   431

	int x = TileX(start);

   432

	int y = TileY(start);

   433

	int ex = TileX(end);

   434

	int ey = TileY(end);

   435

	int dx, dy, trdx, trdy;

   436

   437

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

   438

   439

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

   440

	dx = ex - x;

   441

	dy = ey - y;

   442

   443

	// calculate delta x,y for the first direction

   444

	trdx = _trackdelta[*trackdir].x;

   445

	trdy = _trackdelta[*trackdir].y;

   446

   447

	if (!IsDiagonalTrackdir(*trackdir)) {

   448

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

   449

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

   450

	}

   451

   452

	// validate the direction

   453

	while (

   454

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

   455

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

   456

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

   457

		(trdy >= 0 && dy < 0)

   458

	) {

   459

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

   460

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

   461

			trdx = -trdx;

   462

			trdy = -trdy;

   463

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

   464

			return CMD_ERROR;

   465

	}

   466

   467

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

   468

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

   469

	if (!IsDiagonalTrackdir(*trackdir)) {

   470

		trdx = _trackdelta[*trackdir].x;

   471

		trdy = _trackdelta[*trackdir].y;

   472

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

   473

			return CMD_ERROR;

   474

	}

   475

   476

	return 0;

   477

}

   478

   479

/** Build a stretch of railroad tracks.

   480

 * @param tile start tile of drag

   481

 * @param p1 end tile of drag

   482

 * @param p2 various bitstuffed elements

   483

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

   484

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

   485

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

   486

 */