1

/* $Id$ */

     2

     3

/** @file rail_cmd.cpp */

     4

     5

#include "stdafx.h"

     6

#include "openttd.h"

     7

#include "bridge_map.h"

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#include "bridge.h"

     9

#include "cmd_helper.h"

    10

#include "debug.h"

    11

#include "tile_cmd.h"

    12

#include "rail_map.h"

    13

#include "road_map.h"

    14

#include "landscape.h"

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#include "town_map.h"

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#include "tunnel_map.h"

    17

#include "viewport_func.h"

    18

#include "command_func.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 "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 "newgrf.h"

    28

#include "yapf/yapf.h"

    29

#include "newgrf_engine.h"

    30

#include "newgrf_callbacks.h"

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#include "newgrf_station.h"

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#include "train.h"

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#include "variables.h"

    34

#include "autoslope.h"

    35

#include "transparency.h"

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#include "water.h"

    37

#include "tunnelbridge_map.h"

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#include "window_func.h"

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#include "vehicle_func.h"

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#include "sound_func.h"

    41

#include "signal_func.h"

    42

#include "tunnelbridge.h"

    43

    44

#include "table/sprites.h"

    45

#include "table/strings.h"

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#include "table/railtypes.h"

    47

#include "table/track_land.h"

    48

    49

const byte _track_sloped_sprites[14] = {

    50

	14, 15, 22, 13,

    51

	 0, 21, 17, 12,

    52

	23,  0, 18, 20,

    53

	19, 16

    54

};

    55

    56

    57

/*         4

    58

 *     ---------

    59

 *    |\       /|

    60

 *    | \    1/ |

    61

 *    |  \   /  |

    62

 *    |   \ /   |

    63

 *  16|    \    |32

    64

 *    |   / \2  |

    65

 *    |  /   \  |

    66

 *    | /     \ |

    67

 *    |/       \|

    68

 *     ---------

    69

 *         8

    70

 */

    71

    72

    73

    74

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

    75

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

    76

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

    77

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

    78

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

    79

 *               similar for lower and right.

    80

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

    81

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

    82

 * MAP5:         00abcdef => rail

    83

 *               01abcdef => rail w/ signals

    84

 *               10uuuuuu => unused

    85

 *               11uuuudd => rail depot

    86

 */

    87

    88

    89

void *EnsureNoTrainOnTrackProc(Vehicle *v, void *data)

    90

{

    91

	TrackBits rail_bits = *(TrackBits *)data;

    92

    93

	if (v->type != VEH_TRAIN) return NULL;

    94

    95

	if ((v->u.rail.track != rail_bits) && !TracksOverlap(v->u.rail.track | rail_bits)) return NULL;

    96

    97

	_error_message = VehicleInTheWayErrMsg(v);

    98

	return v;

    99

}

   100

   101

/**

   102

 * Tests if a vehicle interacts with the specified track.

   103

 * All track bits interact except parallel TRACK_BIT_HORZ or TRACK_BIT_VERT.

   104

 *

   105

 * @param tile The tile.

   106

 * @param track The track.

   107

 */

   108

static bool EnsureNoTrainOnTrack(TileIndex tile, Track track)

   109

{

   110

	TrackBits rail_bits = TrackToTrackBits(track);

   111

   112

	return VehicleFromPos(tile, &rail_bits, &EnsureNoTrainOnTrackProc) == NULL;

   113

}

   114

   115

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

   116

{

   117

	TrackBits current; // The current track layout

   118

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

   119

	_error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;

   120

   121

	if (!IsPlainRailTile(tile)) return false;

   122

   123

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

   124

	 * what tracks first */

   125

	current = GetTrackBits(tile);

   126

	future = current | to_build;

   127

   128

	/* Are we really building something new? */

   129

	if (current == future) {

   130

		/* Nothing new is being built */

   131

		_error_message = STR_1007_ALREADY_BUILT;

   132

		return false;

   133

	}

   134

   135

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

   136

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

   137

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

   138

		 * signals on the tile), check that */

   139

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

   140

	} else {

   141

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

   142

		return true;

   143

	}

   144

}

   145

   146

   147

/** Valid TrackBits on a specific (non-steep)-slope without foundation */

   148

static const TrackBits _valid_tracks_without_foundation[15] = {

   149

	TRACK_BIT_ALL,

   150

	TRACK_BIT_RIGHT,

   151

	TRACK_BIT_UPPER,

   152

	TRACK_BIT_X,

   153

   154

	TRACK_BIT_LEFT,

   155

	TRACK_BIT_NONE,

   156

	TRACK_BIT_Y,

   157

	TRACK_BIT_LOWER,

   158

   159

	TRACK_BIT_LOWER,

   160

	TRACK_BIT_Y,

   161

	TRACK_BIT_NONE,

   162

	TRACK_BIT_LEFT,

   163

   164

	TRACK_BIT_X,

   165

	TRACK_BIT_UPPER,

   166

	TRACK_BIT_RIGHT,

   167

};

   168

   169

/** Valid TrackBits on a specific (non-steep)-slope with leveled foundation */

   170

static const TrackBits _valid_tracks_on_leveled_foundation[15] = {

   171

	TRACK_BIT_NONE,

   172

	TRACK_BIT_LEFT,

   173

	TRACK_BIT_LOWER,

   174

	TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,

   175

   176

	TRACK_BIT_RIGHT,

   177

	TRACK_BIT_ALL,

   178

	TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,

   179

	TRACK_BIT_ALL,

   180

   181

	TRACK_BIT_UPPER,

   182

	TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,

   183

	TRACK_BIT_ALL,

   184

	TRACK_BIT_ALL,

   185

   186

	TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,

   187

	TRACK_BIT_ALL,

   188

	TRACK_BIT_ALL

   189

};

   190

   191

/**

   192

 * Checks if a track combination is valid on a specific slope and returns the needed foundation.

   193

 *

   194

 * @param tileh Tile slope.

   195

 * @param bits  Trackbits.

   196

 * @return Needed foundation or FOUNDATION_INVALID if track/slope combination is not allowed.

   197

 */

   198

Foundation GetRailFoundation(Slope tileh, TrackBits bits)

   199

{

   200

	if (bits == TRACK_BIT_NONE) return FOUNDATION_NONE;

   201

   202

	if (IsSteepSlope(tileh)) {

   203

		/* Test for inclined foundations */

   204

		if (bits == TRACK_BIT_X) return FOUNDATION_INCLINED_X;

   205

		if (bits == TRACK_BIT_Y) return FOUNDATION_INCLINED_Y;

   206

   207

		/* Get higher track */

   208

		Corner highest_corner = GetHighestSlopeCorner(tileh);

   209

		TrackBits higher_track = CornerToTrackBits(highest_corner);

   210

   211

		/* Only higher track? */

   212

		if (bits == higher_track) return HalftileFoundation(highest_corner);

   213

   214

		/* Overlap with higher track? */

   215

		if (TracksOverlap(bits | higher_track)) return FOUNDATION_INVALID;

   216

   217

		/* either lower track or both higher and lower track */

   218

		return ((bits & higher_track) != 0 ? FOUNDATION_STEEP_BOTH : FOUNDATION_STEEP_LOWER);

   219

	} else {

   220

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

   221

   222

		bool valid_on_leveled = ((~_valid_tracks_on_leveled_foundation[tileh] & bits) == 0);

   223

   224

		Corner track_corner;

   225

		switch (bits) {

   226

			case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;

   227

			case TRACK_BIT_LOWER: track_corner = CORNER_S; break;

   228

			case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;

   229

			case TRACK_BIT_UPPER: track_corner = CORNER_N; break;

   230

   231

			case TRACK_BIT_HORZ:

   232

				if (tileh == SLOPE_N) return HalftileFoundation(CORNER_N);

   233

				if (tileh == SLOPE_S) return HalftileFoundation(CORNER_S);

   234

				return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);

   235

   236

			case TRACK_BIT_VERT:

   237

				if (tileh == SLOPE_W) return HalftileFoundation(CORNER_W);

   238

				if (tileh == SLOPE_E) return HalftileFoundation(CORNER_E);

   239

				return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);

   240

   241

			case TRACK_BIT_X:

   242

				if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_X;

   243

				return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);

   244

   245

			case TRACK_BIT_Y:

   246

				if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_Y;

   247

				return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);

   248

   249

			default:

   250

				return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);

   251

		}

   252

		/* Single diagonal track */

   253

   254

		/* Track must be at least valid on leveled foundation */

   255

		if (!valid_on_leveled) return FOUNDATION_INVALID;

   256

   257

		/* If slope has three raised corners, build leveled foundation */

   258

		if (IsSlopeWithThreeCornersRaised(tileh)) return FOUNDATION_LEVELED;

   259

   260

		/* If neighboured corners of track_corner are lowered, build halftile foundation */

   261

		if ((tileh & SlopeWithThreeCornersRaised(OppositeCorner(track_corner))) == SlopeWithOneCornerRaised(track_corner)) return HalftileFoundation(track_corner);

   262

   263

		/* else special anti-zig-zag foundation */

   264

		return SpecialRailFoundation(track_corner);

   265

	}

   266

}

   267

   268

   269

/**

   270

 * Tests if a track can be build on a tile.

   271

 *

   272

 * @param tileh Tile slope.

   273

 * @param rail_bits Tracks to build.

   274

 * @param existing Tracks already built.

   275

 * @param tile Tile (used for water test)

   276

 * @return Error message or cost for foundation building.

   277

 */

   278

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

   279

{

   280

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

   281

	if (IsTileType(tile, MP_WATER) || (IsTileType(tile, MP_RAILWAY) && (GetRailGroundType(tile) == RAIL_GROUND_WATER))) {

   282

		if (!IsSteepSlope(tileh) && ((~_valid_tracks_on_leveled_foundation[tileh] & (rail_bits | existing)) != 0)) return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   283

	}

   284

   285

	Foundation f_new = GetRailFoundation(tileh, rail_bits | existing);

   286

   287

	/* check track/slope combination */

   288

	if ((f_new == FOUNDATION_INVALID) ||

   289

	    ((f_new != FOUNDATION_NONE) && (!_patches.build_on_slopes || _is_old_ai_player))

   290

	   ) return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   291

   292

	Foundation f_old = GetRailFoundation(tileh, existing);

   293

	return CommandCost(EXPENSES_CONSTRUCTION, f_new != f_old ? _price.terraform : (Money)0);

   294

}

   295

   296

/* Validate functions for rail building */

   297

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

   298

   299

/** Build a single piece of rail

   300

 * @param tile tile  to build on

   301

 * @param flags operation to perform

   302

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

   303

 * @param p2 rail track to build

   304

 */

   305

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

   306

{

   307

	Slope tileh;

   308

	RailType railtype = (RailType)p1;

   309

	Track track = (Track)p2;

   310

	TrackBits trackbit;

   311

	CommandCost cost(EXPENSES_CONSTRUCTION);

   312

	CommandCost ret;

   313

   314

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

   315

   316

	tileh = GetTileSlope(tile, NULL);

   317

	trackbit = TrackToTrackBits(track);

   318

   319

	switch (GetTileType(tile)) {

   320

		case MP_RAILWAY:

   321

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

   322

					!EnsureNoTrainOnTrack(tile, track)) {

   323

				return CMD_ERROR;

   324

			}

   325

			if (!IsTileOwner(tile, _current_player) ||

   326

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

   327

				/* Get detailed error message */

   328

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

   329

			}

   330

   331

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

   332

			if (CmdFailed(ret)) return ret;

   333

			cost.AddCost(ret);

   334

   335

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

   336

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

   337

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

   338

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

   339

				if (CmdFailed(ret)) return ret;

   340

				cost.AddCost(ret);

   341

			}

   342

   343

			if (flags & DC_EXEC) {

   344

				SetRailGroundType(tile, RAIL_GROUND_BARREN);

   345

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

   346

			}

   347

			break;

   348

   349

		case MP_ROAD:

   350

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

   351

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

   352

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

   353

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   354

			}

   355

#undef M

   356

   357

			if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;

   358

   359

			if (IsNormalRoad(tile)) {

   360

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

   361

   362

				if (GetDisallowedRoadDirections(tile) != DRD_NONE) return_cmd_error(STR_ERR_CROSSING_ON_ONEWAY_ROAD);

   363

   364

				RoadTypes roadtypes = GetRoadTypes(tile);

   365

				RoadBits road = GetRoadBits(tile, ROADTYPE_ROAD);

   366

				RoadBits tram = GetRoadBits(tile, ROADTYPE_TRAM);

   367

				switch (roadtypes) {

   368

					default: break;

   369

					case ROADTYPES_TRAM:

   370

						/* Tram crossings must always have road. */

   371

						if (flags & DC_EXEC) SetRoadOwner(tile, ROADTYPE_ROAD, _current_player);

   372

						roadtypes |= ROADTYPES_ROAD;

   373

						break;

   374

   375

					case ROADTYPES_ROADTRAM: if (road == tram) break;

   376

						/* FALL THROUGH */

   377

					case ROADTYPES_ROADHWAY: // Road and highway are incompatible in this case

   378

					case ROADTYPES_TRAMHWAY: // Tram and highway are incompatible in this case

   379

					case ROADTYPES_ALL:      // Also incompatible

   380

						return CMD_ERROR;

   381

				}

   382

   383

				road |= tram | GetRoadBits(tile, ROADTYPE_HWAY);

   384

   385

				if ((track == TRACK_X && road == ROAD_Y) ||

   386

						(track == TRACK_Y && road == ROAD_X)) {

   387

					if (flags & DC_EXEC) {

   388

						MakeRoadCrossing(tile, GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM), GetRoadOwner(tile, ROADTYPE_HWAY), _current_player, (track == TRACK_X ? AXIS_Y : AXIS_X), railtype, roadtypes, GetTownIndex(tile));

   389

						UpdateLevelCrossing(tile, false);

   390

					}

   391

					break;

   392

				}

   393

			}

   394

   395

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

   396

				return_cmd_error(STR_1007_ALREADY_BUILT);

   397

			}

   398

			/* FALLTHROUGH */

   399

   400

		default:

   401

			/* Will there be flat water on the lower halftile? */

   402

			bool water_ground = IsTileType(tile, MP_WATER) && IsSlopeWithOneCornerRaised(tileh);

   403

   404

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

   405

			if (CmdFailed(ret)) return ret;

   406

			cost.AddCost(ret);

   407

   408

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

   409

			if (CmdFailed(ret)) return ret;

   410

			cost.AddCost(ret);

   411

   412

			if (water_ground) {

   413

				cost.AddCost(-_price.clear_water);

   414

				cost.AddCost(_price.clear_roughland);

   415

			}

   416

   417

			if (flags & DC_EXEC) {

   418

				MakeRailNormal(tile, _current_player, trackbit, railtype);

   419

				if (water_ground) SetRailGroundType(tile, RAIL_GROUND_WATER);

   420

			}

   421

			break;

   422

	}

   423

   424

	if (flags & DC_EXEC) {

   425

		MarkTileDirtyByTile(tile);

   426

		AddTrackToSignalBuffer(tile, track, _current_player);

   427

		YapfNotifyTrackLayoutChange(tile, track);

   428

	}

   429

   430

	return cost.AddCost(RailBuildCost(railtype));

   431

}

   432

   433

/** Remove a single piece of track

   434

 * @param tile tile to remove track from

   435

 * @param flags operation to perform

   436

 * @param p1 unused

   437

 * @param p2 rail orientation

   438

 */

   439

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

   440

{

   441

	Track track = (Track)p2;

   442

	TrackBits trackbit;

   443

	CommandCost cost(EXPENSES_CONSTRUCTION, _price.remove_rail );

   444

	bool crossing = false;

   445

   446

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

   447

	trackbit = TrackToTrackBits(track);

   448

   449

	/* Need to read tile owner now because it may change when the rail is removed

   450

	 * Also, in case of floods, _current_player != owner

   451

	 * There may be invalid tiletype even in exec run (when removing long track),

   452

	 * so do not call GetTileOwner(tile) in any case here */

   453

	Owner owner = INVALID_OWNER;

   454

   455

	switch (GetTileType(tile)) {

   456

		case MP_ROAD: {

   457

			if (!IsLevelCrossing(tile) ||

   458

					GetCrossingRailBits(tile) != trackbit ||

   459

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

   460

					(!(flags & DC_BANKRUPT) && !EnsureNoVehicleOnGround(tile))) {

   461

				return CMD_ERROR;

   462

			}

   463

   464

			if (flags & DC_EXEC) {

   465

				owner = GetTileOwner(tile);

   466

				MakeRoadNormal(tile, GetCrossingRoadBits(tile), GetRoadTypes(tile), GetTownIndex(tile), GetRoadOwner(tile, ROADTYPE_ROAD), GetRoadOwner(tile, ROADTYPE_TRAM), GetRoadOwner(tile, ROADTYPE_HWAY));

   467

			}

   468

			break;

   469

		}

   470

   471

		case MP_RAILWAY: {

   472

			TrackBits present;

   473

   474

			if (!IsPlainRailTile(tile) ||

   475

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

   476

					!EnsureNoTrainOnTrack(tile, track)) {

   477

				return CMD_ERROR;

   478

			}

   479

   480

			present = GetTrackBits(tile);

   481

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

   482

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

   483