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/* $Id$ */

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#include "stdafx.h"

     4

#include "openttd.h"

     5

#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"

    11

#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"

    30

#include "newgrf_callbacks.h"

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#include "newgrf_station.h"

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    33

extern uint16 _custom_sprites_base;

    34

    35

const byte _track_sloped_sprites[14] = {

    36

	14, 15, 22, 13,

    37

	 0, 21, 17, 12,

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	23,  0, 18, 20,

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	19, 16

    40

};

    41

    42

void ShowTrainDepotWindow(TileIndex tile);

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    44

/*         4

    45

 *     ---------

    46

 *    |\       /|

    47

 *    | \    1/ |

    48

 *    |  \   /  |

    49

 *    |   \ /   |

    50

 *  16|    \    |32

    51

 *    |   / \2  |

    52

 *    |  /   \  |

    53

 *    | /     \ |

    54

 *    |/       \|

    55

 *     ---------

    56

 *         8

    57

 */

    58

    59

    60

    61

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

    62

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

    63

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

    64

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

    65

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

    66

 *				 similar for lower and right.

    67

 * 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

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 *               11uuuudd => rail depot

    73

 */

    74

    75

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

    76

{

    77

	RailTileType type = GetRailTileType(tile);

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	TrackBits current; /* The current track layout */

    79

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

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	_error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;

    81

    82

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

    83

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

    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);

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	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) || type == RAIL_TYPE_SIGNALS) {

    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

const TrackBits _valid_tileh_slopes[2][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

	0,

   120

	TRACK_BIT_Y,

   121

	TRACK_BIT_LOWER,

   122

   123

	TRACK_BIT_LOWER,

   124

	TRACK_BIT_Y,

   125

	0,

   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

	0,

   136

	TRACK_BIT_LEFT,

   137

	TRACK_BIT_LOWER,

   138

	TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,

   139

   140

	TRACK_BIT_RIGHT,

   141

	TRACK_BIT_ALL,

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	TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,

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	TRACK_BIT_ALL,

   144

   145

	TRACK_BIT_UPPER,

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	TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,

   147

	TRACK_BIT_ALL,

   148

	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

	int i;

   159

   160

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

   161

		return 0;

   162

   163

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

   164

		return tileh;

   165

   166

	if ((

   167

				(i  = 0, tileh == SLOPE_W) ||

   168

				(i += 2, tileh == SLOPE_S) ||

   169

				(i += 2, tileh == SLOPE_E) ||

   170

				(i += 2, tileh == SLOPE_N)

   171

			) && (

   172

				bits == TRACK_BIT_X ||

   173

				(i++, bits == TRACK_BIT_Y)

   174

			)) {

   175

		return i + 15;

   176

	} else {

   177

		return 0;

   178

	}

   179

}

   180

   181

   182

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

   183

{

   184

	// never allow building on top of steep tiles

   185

	if (!IsSteepSlope(tileh)) {

   186

		rail_bits |= existing;

   187

   188

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

   189

		if (IsTileType(tile, MP_WATER) &&

   190

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

   191

			return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   192

		}

   193

   194

		// no special foundation

   195

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

   196

			return 0;

   197

   198

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

   199

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

   200

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

   201

				)) { // partly up

   202

			if (existing != 0) {

   203

				return 0;

   204

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

   205

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   206

			} else {

   207

				return _price.terraform;

   208

			}

   209

		}

   210

	}

   211

	return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   212

}

   213

   214

/* Validate functions for rail building */

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

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   217

/** Build a single piece of rail

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 * @param tile tile  to build on

   219

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

   220

 * @param p2 rail track to build

   221

 */

   222

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

   223

{

   224

	Slope tileh;

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	Track track = (Track)p2;

   226

	TrackBits trackbit;

   227

	int32 cost = 0;

   228

	int32 ret;

   229

   230

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

   231

   232

	tileh = GetTileSlope(tile, NULL);

   233

	trackbit = TrackToTrackBits(track);

   234

   235

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   236

   237

	switch (GetTileType(tile)) {

   238

		case MP_TUNNELBRIDGE:

   239

			if (!IsBridge(tile) ||

   240

					!IsBridgeMiddle(tile) ||

   241

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

   242

				// Get detailed error message

   243

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

   244

			}

   245

   246

			if (IsClearUnderBridge(tile)) {

   247

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

   248

				if (CmdFailed(ret)) return ret;

   249

				cost += ret;

   250

   251

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

   252

			} else if (IsTransportUnderBridge(tile) &&

   253

					GetTransportTypeUnderBridge(tile) == TRANSPORT_RAIL) {

   254

				return_cmd_error(STR_1007_ALREADY_BUILT);

   255

			} else {

   256

				// Get detailed error message

   257

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

   258

			}

   259

			break;

   260

   261

		case MP_RAILWAY:

   262

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

   263

					!EnsureNoVehicle(tile)) {

   264

				return CMD_ERROR;

   265

			}

   266

			if (GetRailTileType(tile) == RAIL_TYPE_DEPOT_WAYPOINT ||

   267

					!IsTileOwner(tile, _current_player) ||

   268

					GetRailType(tile) != p1) {

   269

				// Get detailed error message

   270

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

   271

			}

   272

   273

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

   274

			if (CmdFailed(ret)) return ret;

   275

			cost += ret;

   276

   277

			if (flags & DC_EXEC) {

   278

				SetRailGroundType(tile, RAIL_GROUND_BARREN);

   279

				_m[tile].m5 |= trackbit;

   280

			}

   281

			break;

   282

   283

		case MP_STREET:

   284

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

   285

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

   286

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

   287

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   288

			}

   289

#undef M

   290

   291

			if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   292

   293

			if (GetRoadType(tile) == ROAD_NORMAL && (

   294

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

   295

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

   296

					)) {

   297

				if (flags & DC_EXEC) {

   298

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

   299

				}

   300

				break;

   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, 0, 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, p1);

   318

			break;

   319

	}

   320

   321

	if (flags & DC_EXEC) {

   322

		MarkTileDirtyByTile(tile);

   323

		SetSignalsOnBothDir(tile, track);

   324

	}

   325

   326

	return cost + _price.build_rail;

   327

}

   328

   329

/** Remove a single piece of track

   330

 * @param tile tile to remove track from

   331

 * @param p1 unused

   332

 * @param p2 rail orientation

   333

 */

   334

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

   335

{

   336

	Track track = (Track)p2;

   337

	TrackBits trackbit;

   338

	int32 cost = _price.remove_rail;

   339

	bool crossing = false;

   340

   341

	if (!ValParamTrackOrientation(p2)) return CMD_ERROR;

   342

	trackbit = TrackToTrackBits(track);

   343

   344

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   345

   346

	switch (GetTileType(tile)) {

   347

		case MP_TUNNELBRIDGE:

   348

			if (!IsBridge(tile) ||

   349

					!IsBridgeMiddle(tile) ||

   350

					!IsTransportUnderBridge(tile) ||

   351

					GetTransportTypeUnderBridge(tile) != TRANSPORT_RAIL ||

   352

					GetRailBitsUnderBridge(tile) != trackbit ||

   353

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

   354

					!EnsureNoVehicleZ(tile, TilePixelHeight(tile))) {

   355

				return CMD_ERROR;

   356

			}

   357

   358

			if (flags & DC_EXEC) SetClearUnderBridge(tile);

   359

			break;

   360

   361

		case MP_STREET: {

   362

			if (!IsLevelCrossing(tile) ||

   363

					GetCrossingRailBits(tile) != trackbit ||

   364

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

   365

					!EnsureNoVehicle(tile)) {

   366

				return CMD_ERROR;

   367

			}

   368

   369

			if (flags & DC_EXEC) {

   370

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

   371

			}

   372

			break;

   373

		}

   374

   375

		case MP_RAILWAY: {

   376

			TrackBits present;

   377

   378

			if (!IsPlainRailTile(tile) ||

   379

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

   380

					!EnsureNoVehicle(tile)) {

   381

				return CMD_ERROR;

   382

			}

   383

   384

			present = GetTrackBits(tile);

   385

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

   386

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

   387

   388

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

   389

			if (HasSignalOnTrack(tile, track))

   390

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

   391

   392

			if (flags & DC_EXEC) {

   393

				present ^= trackbit;

   394

				if (present == 0) {

   395

					DoClearSquare(tile);

   396

				} else {

   397

					SetTrackBits(tile, present);

   398

				}

   399

			}

   400

			break;

   401

		}

   402

   403

		default: return CMD_ERROR;

   404

	}

   405

   406

	if (flags & DC_EXEC) {

   407

		MarkTileDirtyByTile(tile);

   408

		if (crossing) {

   409

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

   410

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

   411

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

   412

			 * 'connect' with the other piece. */

   413

			SetSignalsOnBothDir(tile, TRACK_X);

   414

			SetSignalsOnBothDir(tile, TRACK_Y);

   415

		} else {

   416

			SetSignalsOnBothDir(tile, track);

   417

		}

   418

	}

   419

   420

	return cost;

   421

}

   422

   423

   424

static const TileIndexDiffC _trackdelta[] = {

   425

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

   426

	{  0,  0 },

   427

	{  0,  0 },

   428

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

   429

	{  0,  0 },

   430

	{  0,  0 }

   431

};

   432

   433

   434

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

   435

{

   436

	int x = TileX(start);

   437

	int y = TileY(start);

   438

	int ex = TileX(end);

   439

	int ey = TileY(end);

   440

	int dx, dy, trdx, trdy;

   441

   442

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

   443

   444

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

   445

	dx = ex - x;

   446

	dy = ey - y;

   447

   448

	// calculate delta x,y for the first direction

   449

	trdx = _trackdelta[*trackdir].x;

   450

	trdy = _trackdelta[*trackdir].y;

   451

   452

	if (!IsDiagonalTrackdir(*trackdir)) {

   453

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

   454

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

   455

	}

   456

   457

	// validate the direction

   458

	while (

   459

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

   460

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

   461

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

   462

		(trdy >= 0 && dy < 0)

   463

	) {

   464

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

   465

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

   466

			trdx = -trdx;

   467

			trdy = -trdy;

   468

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

   469

			return CMD_ERROR;

   470

	}

   471

   472

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

   473

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

   474

	if (!IsDiagonalTrackdir(*trackdir)) {

   475

		trdx = _trackdelta[*trackdir].x;

   476

		trdy = _trackdelta[*trackdir].y;

   477

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

   478

			return CMD_ERROR;

   479

	}

   480

   481

	return 0;

   482

}

   483

   484

/** Build a stretch of railroad tracks.

   485

 * @param tile start tile of drag

   486

 * @param p1 end tile of drag

   487

 * @param p2 various bitstuffed elements