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/* $Id$ */

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#include "stdafx.h"

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#include "openttd.h"

     5

#include "bridge_map.h"

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#include "debug.h"

     7

#include "functions.h"

     8

#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"

    14

#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"

    28

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

    29

#include "newgrf.h"

    30

    31

extern uint16 _custom_sprites_base;

    32

    33

const byte _track_sloped_sprites[14] = {

    34

	14, 15, 22, 13,

    35

	 0, 21, 17, 12,

    36

	23,  0, 18, 20,

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	19, 16

    38

};

    39

    40

void ShowTrainDepotWindow(TileIndex tile);

    41

    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);

    76

	TrackBits current; /* The current track layout */

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

    78

	_error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;

    79

    80

	if (type != RAIL_TYPE_NORMAL && type != RAIL_TYPE_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);

    86

	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_TYPE_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,

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	TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,

   137

   138

	TRACK_BIT_RIGHT,

   139

	TRACK_BIT_ALL,

   140

	TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,

   141

	TRACK_BIT_ALL,

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   143

	TRACK_BIT_UPPER,

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	TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,

   145

	TRACK_BIT_ALL,

   146

	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

	int i;

   157

   158

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

   159

		return 0;

   160

   161

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

   162

		return tileh;

   163

   164

	if ((

   165

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

   166

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

   167

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

   168

				(i += 2, tileh == SLOPE_N)

   169

			) && (

   170

				bits == TRACK_BIT_X ||

   171

				(i++, bits == TRACK_BIT_Y)

   172

			)) {

   173

		return i + 15;

   174

	} else {

   175

		return 0;

   176

	}

   177

}

   178

   179

   180

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

   181

{

   182

	// never allow building on top of steep tiles

   183

	if (!IsSteepSlope(tileh)) {

   184

		rail_bits |= existing;

   185

   186

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

   187

		if (IsTileType(tile, MP_WATER) &&

   188

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

   189

			return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   190

		}

   191

   192

		// no special foundation

   193

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

   194

			return 0;

   195

   196

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

   197

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

   198

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

   199

				)) { // partly up

   200

			if (existing != 0) {

   201

				return 0;

   202

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

   203

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   204

			} else {

   205

				return _price.terraform;

   206

			}

   207

		}

   208

	}

   209

	return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   210

}

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   212

/* Validate functions for rail building */

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

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   215

/** Build a single piece of rail

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 * @param tile tile  to build on

   217

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

   218

 * @param p2 rail track to build

   219

 */

   220

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

   221

{

   222

	Slope tileh;

   223

	Track track = (Track)p2;

   224

	TrackBits trackbit;

   225

	int32 cost = 0;

   226

	int32 ret;

   227

   228

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

   229

   230

	tileh = GetTileSlope(tile, NULL);

   231

	trackbit = TrackToTrackBits(track);

   232

   233

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   234

   235

	switch (GetTileType(tile)) {

   236

		case MP_TUNNELBRIDGE:

   237

			if (!IsBridge(tile) ||

   238

					!IsBridgeMiddle(tile) ||

   239

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

   240

				// Get detailed error message

   241

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

   242

			}

   243

   244

			if (IsClearUnderBridge(tile)) {

   245

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

   246

				if (CmdFailed(ret)) return ret;

   247

				cost += ret;

   248

   249

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

   250

			} else if (IsTransportUnderBridge(tile) &&

   251

					GetTransportTypeUnderBridge(tile) == TRANSPORT_RAIL) {

   252

				return_cmd_error(STR_1007_ALREADY_BUILT);

   253

			} else {

   254

				// Get detailed error message

   255

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

   256

			}

   257

			break;

   258

   259

		case MP_RAILWAY:

   260

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

   261

					!EnsureNoVehicle(tile)) {

   262

				return CMD_ERROR;

   263

			}

   264

			if (GetRailTileType(tile) == RAIL_TYPE_DEPOT_WAYPOINT ||

   265

					!IsTileOwner(tile, _current_player) ||

   266

					GetRailType(tile) != p1) {

   267

				// Get detailed error message

   268

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

   269

			}

   270

   271

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

   272

			if (CmdFailed(ret)) return ret;

   273

			cost += ret;

   274

   275

			if (flags & DC_EXEC) {

   276

				SetRailGroundType(tile, RAIL_GROUND_BARREN);

   277

				_m[tile].m5 |= 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 (GetRoadType(tile) == ROAD_NORMAL && (

   292

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

   293

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

   294

					)) {

   295

				if (flags & DC_EXEC) {

   296

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

   297

				}

   298

				break;

   299

			}

   300

   301

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

   302

				return_cmd_error(STR_1007_ALREADY_BUILT);

   303

			}

   304

			/* FALLTHROUGH */

   305

   306

		default:

   307

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

   308

			if (CmdFailed(ret)) return ret;

   309

			cost += ret;

   310

   311

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

   312

			if (CmdFailed(ret)) return ret;

   313

			cost += ret;

   314

   315

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

   316

			break;

   317

	}

   318

   319

	if (flags & DC_EXEC) {

   320

		MarkTileDirtyByTile(tile);

   321

		SetSignalsOnBothDir(tile, track);

   322

	}

   323

   324

	return cost + _price.build_rail;

   325

}

   326

   327

/** Remove a single piece of track

   328

 * @param tile tile to remove track from

   329

 * @param p1 unused

   330

 * @param p2 rail orientation

   331

 */

   332

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

   333

{

   334

	Track track = (Track)p2;

   335

	TrackBits trackbit;

   336

	int32 cost = _price.remove_rail;

   337

	bool crossing = false;

   338

   339

	if (!ValParamTrackOrientation(p2)) return CMD_ERROR;

   340

	trackbit = TrackToTrackBits(track);

   341

   342

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   343

   344

	switch (GetTileType(tile)) {

   345

		case MP_TUNNELBRIDGE:

   346

			if (!IsBridge(tile) ||

   347

					!IsBridgeMiddle(tile) ||

   348

					!IsTransportUnderBridge(tile) ||

   349

					GetTransportTypeUnderBridge(tile) != TRANSPORT_RAIL ||

   350

					GetRailBitsUnderBridge(tile) != trackbit ||

   351

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

   352

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

   353

				return CMD_ERROR;

   354

			}

   355

   356

			if (flags & DC_EXEC) SetClearUnderBridge(tile);

   357

			break;

   358

   359

		case MP_STREET: {

   360

			if (!IsLevelCrossing(tile) ||

   361

					GetCrossingRailBits(tile) != trackbit ||

   362

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

   363

					!EnsureNoVehicle(tile)) {

   364

				return CMD_ERROR;

   365

			}

   366

   367

			if (flags & DC_EXEC) {

   368

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

   369

			}

   370

			break;

   371

		}

   372

   373

		case MP_RAILWAY: {

   374

			TrackBits present;

   375

   376

			if (!IsPlainRailTile(tile) ||

   377

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

   378

					!EnsureNoVehicle(tile)) {

   379

				return CMD_ERROR;

   380

			}

   381

   382

			present = GetTrackBits(tile);

   383

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

   384

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

   385

   386

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

   387

			if (HasSignalOnTrack(tile, track))

   388

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

   389

   390

			if (flags & DC_EXEC) {

   391

				present ^= trackbit;

   392

				if (present == 0) {

   393

					DoClearSquare(tile);

   394

				} else {

   395

					SetTrackBits(tile, present);

   396

				}

   397

			}

   398

			break;

   399

		}

   400

   401

		default: return CMD_ERROR;

   402

	}

   403

   404

	if (flags & DC_EXEC) {

   405

		MarkTileDirtyByTile(tile);

   406

		if (crossing) {

   407

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

   408

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

   409

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

   410

			 * 'connect' with the other piece. */

   411

			SetSignalsOnBothDir(tile, TRACK_X);

   412

			SetSignalsOnBothDir(tile, TRACK_Y);

   413

		} else {

   414

			SetSignalsOnBothDir(tile, track);

   415

		}

   416

	}

   417

   418

	return cost;

   419

}

   420

   421

   422

static const TileIndexDiffC _trackdelta[] = {

   423

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

   424

	{  0,  0 },

   425

	{  0,  0 },

   426

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

   427

	{  0,  0 },

   428

	{  0,  0 }

   429

};

   430

   431

   432

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

   433

{

   434

	int x = TileX(start);

   435

	int y = TileY(start);

   436

	int ex = TileX(end);

   437

	int ey = TileY(end);

   438

	int dx, dy, trdx, trdy;

   439

   440

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

   441

   442

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

   443

	dx = ex - x;

   444

	dy = ey - y;

   445

   446

	// calculate delta x,y for the first direction

   447

	trdx = _trackdelta[*trackdir].x;

   448

	trdy = _trackdelta[*trackdir].y;

   449

   450

	if (!IsDiagonalTrackdir(*trackdir)) {

   451

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

   452

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

   453

	}

   454

   455

	// validate the direction

   456

	while (

   457

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

   458

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

   459

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

   460

		(trdy >= 0 && dy < 0)

   461

	) {

   462

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

   463

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

   464

			trdx = -trdx;

   465

			trdy = -trdy;

   466

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

   467

			return CMD_ERROR;

   468

	}

   469

   470

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

   471

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

   472

	if (!IsDiagonalTrackdir(*trackdir)) {

   473

		trdx = _trackdelta[*trackdir].x;

   474

		trdy = _trackdelta[*trackdir].y;

   475

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

   476

			return CMD_ERROR;

   477

	}

   478

   479

	return 0;

   480

}

   481

   482

/** Build a stretch of railroad tracks.

   483

 * @param tile start tile of drag

   484

 * @param p1 end tile of drag

   485

 * @param p2 various bitstuffed elements

   486

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

   487

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