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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"

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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

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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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    34

const byte _track_sloped_sprites[14] = {

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	14, 15, 22, 13,

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	 0, 21, 17, 12,

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	23,  0, 18, 20,

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	19, 16

    39

};

    40

    41

void ShowTrainDepotWindow(TileIndex tile);

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    43

/*         4

    44

 *     ---------

    45

 *    |\       /|

    46

 *    | \    1/ |

    47

 *    |  \   /  |

    48

 *    |   \ /   |

    49

 *  16|    \    |32

    50

 *    |   / \2  |

    51

 *    |  /   \  |

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 *    | /     \ |

    53

 *    |/       \|

    54

 *     ---------

    55

 *         8

    56

 */

    57

    58

    59

    60

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

    61

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

    62

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

    63

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

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

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 *				 similar for lower and right.

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 * 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

    72

 */

    73

    74

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

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{

    76

	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 (!IsPlainRailTile(tile)) return false;

    81

    82

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

    83

	 * what tracks first */

    84

	current = GetTrackBits(tile);

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	future = current | to_build;

    86

    87

	/* Are we really building something new? */

    88

	if (current == future) {

    89

		/* Nothing new is being built */

    90

		_error_message = STR_1007_ALREADY_BUILT;

    91

		return false;

    92

	}

    93

    94

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

    95

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

    96

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

    97

		 * signals on the tile), check that */

    98

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

    99

	} else {

   100

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

   101

		return true;

   102

	}

   103

}

   104

   105

   106

static const TrackBits _valid_tileh_slopes[][15] = {

   107

   108

// set of normal ones

   109

{

   110

	TRACK_BIT_ALL,

   111

	TRACK_BIT_RIGHT,

   112

	TRACK_BIT_UPPER,

   113

	TRACK_BIT_X,

   114

   115

	TRACK_BIT_LEFT,

   116

	0,

   117

	TRACK_BIT_Y,

   118

	TRACK_BIT_LOWER,

   119

   120

	TRACK_BIT_LOWER,

   121

	TRACK_BIT_Y,

   122

	0,

   123

	TRACK_BIT_LEFT,

   124

   125

	TRACK_BIT_X,

   126

	TRACK_BIT_UPPER,

   127

	TRACK_BIT_RIGHT,

   128

},

   129

   130

// allowed rail for an evenly raised platform

   131

{

   132

	0,

   133

	TRACK_BIT_LEFT,

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	TRACK_BIT_LOWER,

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	TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,

   136

   137

	TRACK_BIT_RIGHT,

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	TRACK_BIT_ALL,

   139

	TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,

   140

	TRACK_BIT_ALL,

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   142

	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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   147

	TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,

   148

	TRACK_BIT_ALL,

   149

	TRACK_BIT_ALL

   150

}

   151

};

   152

   153

uint GetRailFoundation(Slope tileh, TrackBits bits)

   154

{

   155

	uint i;

   156

   157

	if (!IsSteepSlope(tileh)) {

   158

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

   159

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

   160

	}

   161

   162

	switch (bits) {

   164

		case TRACK_BIT_X: i = 0; break;

   165

		case TRACK_BIT_Y: i = 1; break;

   170

	}

   171

	switch (tileh) {

   172

		case SLOPE_W:

   173

		case SLOPE_STEEP_W: i += 0; break;

   174

		case SLOPE_S:

   175

		case SLOPE_STEEP_S: i += 2; break;

   176

		case SLOPE_E:

   177

		case SLOPE_STEEP_E: i += 4; break;

   178

		case SLOPE_N:

   179

		case SLOPE_STEEP_N: i += 6; break;

   180

		default: return 0;

   181

	}

   182

	return i + 15;

   183

}

   184

   185

   186

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

   187

{

   188

	if (IsSteepSlope(tileh)) {

   192

		}

   193

	} else {

   194

		rail_bits |= existing;

   195

   196

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

   197

		if (IsTileType(tile, MP_WATER) &&

   198

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

   199

			return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   200

		}

   201

   202

		// no special foundation

   203

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

   204

			return 0;

   205

   206

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

   207

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

   208

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

   209

				)) { // partly up

   210

			if (existing != 0) {

   211

				return 0;

   212

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

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				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   214

			} else {

   215

				return _price.terraform;

   216

			}

   217

		}

   218

	}

   219

	return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

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}

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   222

/* Validate functions for rail building */

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

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   225

/** Build a single piece of rail

   226

 * @param tile tile  to build on

   227

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

   228

 * @param p2 rail track to build

   229

 */

   230

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

   231

{

   232

	Slope tileh;

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	Track track = (Track)p2;

   234

	TrackBits trackbit;

   235

	int32 cost = 0;

   236

	int32 ret;

   237

   238

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

   239

   240

	tileh = GetTileSlope(tile, NULL);

   241

	trackbit = TrackToTrackBits(track);

   242

   243

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   244

   245

	switch (GetTileType(tile)) {

   246

		case MP_TUNNELBRIDGE:

   247

			if (!IsBridge(tile) ||

   248

					!IsBridgeMiddle(tile) ||

   249

					AxisToTrackBits(OtherAxis(GetBridgeAxis(tile))) != trackbit) {

   250

				// Get detailed error message

   251

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

   252

			}

   253

   254

			if (IsClearUnderBridge(tile)) {

   255

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

   256

				if (CmdFailed(ret)) return ret;

   257

				cost += ret;

   258

   259

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

   260

			} else if (IsTransportUnderBridge(tile) &&

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					GetTransportTypeUnderBridge(tile) == TRANSPORT_RAIL) {

   262

				return_cmd_error(STR_1007_ALREADY_BUILT);

   263

			} else {

   264

				// Get detailed error message

   265

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

   266

			}

   267

			break;

   268

   269

		case MP_RAILWAY:

   270

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

   271

					!EnsureNoVehicle(tile)) {

   272

				return CMD_ERROR;

   273

			}

   274

			if (!IsTileOwner(tile, _current_player) ||

   275

					GetRailType(tile) != p1) {

   276

				// Get detailed error message

   277

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

   278

			}

   279

   280

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

   281

			if (CmdFailed(ret)) return ret;

   282

			cost += ret;

   283

   284

			if (flags & DC_EXEC) {

   285

				SetRailGroundType(tile, RAIL_GROUND_BARREN);

   286

				_m[tile].m5 |= trackbit;

   287

			}

   288

			break;

   289

   290

		case MP_STREET:

   291

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

   292

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

   293

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

   294

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   295

			}

   296

#undef M

   297

   298

			if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   299

   300

			if (GetRoadTileType(tile) == ROAD_TILE_NORMAL) {

   301

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

   302

   303

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

   304

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

   305

					if (flags & DC_EXEC) {

   306

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

   307

					}

   308

					break;

   309

				}

   310

			}

   311

   312

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

   313

				return_cmd_error(STR_1007_ALREADY_BUILT);

   314

			}

   315

			/* FALLTHROUGH */

   316

   317

		default:

   318

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

   319

			if (CmdFailed(ret)) return ret;

   320

			cost += ret;

   321

   322

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

   323

			if (CmdFailed(ret)) return ret;

   324

			cost += ret;

   325

   326

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

   327

			break;

   328

	}

   329

   330

	if (flags & DC_EXEC) {

   331

		MarkTileDirtyByTile(tile);

   332

		SetSignalsOnBothDir(tile, track);

   333

		YapfNotifyTrackLayoutChange(tile, track);

   334

	}

   335

   336

	return cost + _price.build_rail;

   337

}

   338

   339

/** Remove a single piece of track

   340

 * @param tile tile to remove track from

   341

 * @param p1 unused

   342

 * @param p2 rail orientation

   343

 */

   344

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

   345

{

   346

	Track track = (Track)p2;

   347

	TrackBits trackbit;

   348

	int32 cost = _price.remove_rail;

   349

	bool crossing = false;

   350

   351

	if (!ValParamTrackOrientation(p2)) return CMD_ERROR;

   352

	trackbit = TrackToTrackBits(track);

   353

   354

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   355

   356

	switch (GetTileType(tile)) {

   357

		case MP_TUNNELBRIDGE:

   358

			if (!IsBridge(tile) ||

   359

					!IsBridgeMiddle(tile) ||

   360

					!IsTransportUnderBridge(tile) ||

   361

					GetTransportTypeUnderBridge(tile) != TRANSPORT_RAIL ||

   362

					GetRailBitsUnderBridge(tile) != trackbit ||

   363

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

   364

					!EnsureNoVehicleOnGround(tile)) {

   365

				return CMD_ERROR;

   366

			}

   367

   368

			if (flags & DC_EXEC) SetClearUnderBridge(tile);

   369

			break;

   370

   371

		case MP_STREET: {

   372

			if (!IsLevelCrossing(tile) ||

   373

					GetCrossingRailBits(tile) != trackbit ||

   374

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

   375

					!EnsureNoVehicle(tile)) {

   376

				return CMD_ERROR;

   377

			}

   378

   379

			if (flags & DC_EXEC) {

   380

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

   381

			}

   382

			break;

   383

		}

   384

   385

		case MP_RAILWAY: {

   386

			TrackBits present;

   387

   388

			if (!IsPlainRailTile(tile) ||

   389

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

   390

					!EnsureNoVehicle(tile)) {

   391

				return CMD_ERROR;

   392

			}

   393

   394

			present = GetTrackBits(tile);

   395

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

   396

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

   397

   398

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

   399

			if (HasSignalOnTrack(tile, track))

   400

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

   401

   402

			if (flags & DC_EXEC) {

   403

				present ^= trackbit;

   404

				if (present == 0) {

   405

					DoClearSquare(tile);

   406

				} else {

   407

					SetTrackBits(tile, present);

   408

				}

   409

			}

   410

			break;

   411

		}

   412

   413

		default: return CMD_ERROR;

   414

	}

   415

   416

	if (flags & DC_EXEC) {

   417

		MarkTileDirtyByTile(tile);

   418

		if (crossing) {

   419

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

   420

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

   421

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

   422

			 * 'connect' with the other piece. */

   423

			SetSignalsOnBothDir(tile, TRACK_X);

   424

			SetSignalsOnBothDir(tile, TRACK_Y);

   425

			YapfNotifyTrackLayoutChange(tile, TRACK_X);

   426

			YapfNotifyTrackLayoutChange(tile, TRACK_Y);

   427

		} else {

   428

			SetSignalsOnBothDir(tile, track);

   429

			YapfNotifyTrackLayoutChange(tile, track);

   430

		}

   431

	}

   432

   433

	return cost;

   434

}

   435

   436

   437

static const TileIndexDiffC _trackdelta[] = {

   438

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

   439

	{  0,  0 },

   440

	{  0,  0 },

   441

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

   442

	{  0,  0 },

   443

	{  0,  0 }

   444

};

   445

   446

   447

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

   448

{

   449

	int x = TileX(start);

   450

	int y = TileY(start);

   451

	int ex = TileX(end);

   452

	int ey = TileY(end);

   453

	int dx, dy, trdx, trdy;

   454

   455

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

   456

   457

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

   458

	dx = ex - x;

   459

	dy = ey - y;

   460

   461

	// calculate delta x,y for the first direction

   462

	trdx = _trackdelta[*trackdir].x;

   463

	trdy = _trackdelta[*trackdir].y;

   464

   465

	if (!IsDiagonalTrackdir(*trackdir)) {

   466

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

   467

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

   468

	}

   469

   470

	// validate the direction

   471

	while (

   472

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

   473

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

   474

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

   475

		(trdy >= 0 && dy < 0)

   476

	) {

   477

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

   478

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

   479

			trdx = -trdx;

   480

			trdy = -trdy;

   481

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

   482

			return CMD_ERROR;

   483

		}

   484

	}

   485

   486

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

   487

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