1

/* $Id$ */

     2

     3

/** @file rail_cmd.cpp Handling of rail tiles. */

     4

     5

#include "stdafx.h"

     6

#include "openttd.h"

     7

#include "bridge_map.h"

     8

#include "bridge.h"

     9

#include "cmd_helper.h"

    10

#include "debug.h"

    11

#include "tile_cmd.h"

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#include "rail_map.h"

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#include "road_map.h"

    14

#include "landscape.h"

    15

#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_func.h"

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#include "engine_base.h"

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#include "town.h"

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#include "sprite.h"

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#include "depot_base.h"

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#include "depot_func.h"

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#include "waypoint.h"

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#include "rail.h"

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#include "newgrf.h"

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#include "yapf/yapf.h"

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#include "newgrf_engine.h"

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#include "newgrf_callbacks.h"

    32

#include "newgrf_station.h"

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#include "train.h"

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#include "variables.h"

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#include "autoslope.h"

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#include "transparency.h"

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#include "water.h"

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#include "tunnelbridge_map.h"

    39

#include "window_func.h"

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#include "vehicle_func.h"

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#include "sound_func.h"

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#include "signal_func.h"

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#include "tunnelbridge.h"

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#include "station_map.h"

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#include "water_map.h"

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#include "functions.h"

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#include "elrail_func.h"

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#include "oldpool_func.h"

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#include "pbs.h"

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#include "core/smallvec_type.hpp"

    51

    52

#include "table/sprites.h"

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#include "table/strings.h"

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#include "table/railtypes.h"

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#include "table/track_land.h"

    56

    57

const byte _track_sloped_sprites[14] = {

    58

	14, 15, 22, 13,

    59

	 0, 21, 17, 12,

    60

	23,  0, 18, 20,

    61

	19, 16

    62

};

    63

    64

    65

/*         4

    66

 *     ---------

    67

 *    |\       /|

    68

 *    | \    1/ |

    69

 *    |  \   /  |

    70

 *    |   \ /   |

    71

 *  16|    \    |32

    72

 *    |   / \2  |

    73

 *    |  /   \  |

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 *    | /     \ |

    75

 *    |/       \|

    76

 *     ---------

    77

 *         8

    78

 */

    79

    80

    81

    82

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

    83

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

    84

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

    85

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

    86

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

    87

 *               similar for lower and right.

    88

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

    89

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

    90

 * MAP5:         00abcdef => rail

    91

 *               01abcdef => rail w/ signals

    92

 *               10uuuuuu => unused

    93

 *               11uuuudd => rail depot

    94

 */

    95

    96

    97

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

    98

{

    99

	TrackBits rail_bits = *(TrackBits *)data;

   100

   101

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

   102

   103

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

   104

   105

	_error_message = VehicleInTheWayErrMsg(v);

   106

	return v;

   107

}

   108

   109

/**

   110

 * Tests if a vehicle interacts with the specified track.

   111

 * All track bits interact except parallel TRACK_BIT_HORZ or TRACK_BIT_VERT.

   112

 *

   113

 * @param tile The tile.

   114

 * @param track The track.

   115

 */

   116

static bool EnsureNoTrainOnTrack(TileIndex tile, Track track)

   117

{

   118

	TrackBits rail_bits = TrackToTrackBits(track);

   119

   120

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

   121

}

   122

   123

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

   124

{

   125

	TrackBits current; // The current track layout

   126

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

   127

	_error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;

   128

   129

	if (!IsPlainRailTile(tile)) return false;

   130

   131

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

   132

	 * what tracks first */

   133

	current = GetTrackBits(tile);

   134

	future = current | to_build;

   135

   136

	/* Are we really building something new? */

   137

	if (current == future) {

   138

		/* Nothing new is being built */

   139

		_error_message = STR_1007_ALREADY_BUILT;

   140

		return false;

   141

	}

   142

   143

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

   144

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

   145

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

   146

		 * signals on the tile), check that */

   147

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

   148

	} else {

   149

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

   150

		return true;

   151

	}

   152

}

   153

   154

   155

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

   156

static const TrackBits _valid_tracks_without_foundation[15] = {

   157

	TRACK_BIT_ALL,

   158

	TRACK_BIT_RIGHT,

   159

	TRACK_BIT_UPPER,

   160

	TRACK_BIT_X,

   161

   162

	TRACK_BIT_LEFT,

   163

	TRACK_BIT_NONE,

   164

	TRACK_BIT_Y,

   165

	TRACK_BIT_LOWER,

   166

   167

	TRACK_BIT_LOWER,

   168

	TRACK_BIT_Y,

   169

	TRACK_BIT_NONE,

   170

	TRACK_BIT_LEFT,

   171

   172

	TRACK_BIT_X,

   173

	TRACK_BIT_UPPER,

   174

	TRACK_BIT_RIGHT,

   175

};

   176

   177

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

   178

static const TrackBits _valid_tracks_on_leveled_foundation[15] = {

   179

	TRACK_BIT_NONE,

   180

	TRACK_BIT_LEFT,

   181

	TRACK_BIT_LOWER,

   182

	TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,

   183

   184

	TRACK_BIT_RIGHT,

   185

	TRACK_BIT_ALL,

   186

	TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,

   187

	TRACK_BIT_ALL,

   188

   189

	TRACK_BIT_UPPER,

   190

	TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,

   191

	TRACK_BIT_ALL,

   192

	TRACK_BIT_ALL,

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   194

	TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,

   195

	TRACK_BIT_ALL,

   196

	TRACK_BIT_ALL

   197

};

   198

   199

/**

   200

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

   201

 *

   202

 * @param tileh Tile slope.

   203

 * @param bits  Trackbits.

   204

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

   205

 */

   206

Foundation GetRailFoundation(Slope tileh, TrackBits bits)

   207

{

   208

	if (bits == TRACK_BIT_NONE) return FOUNDATION_NONE;

   209

   210

	if (IsSteepSlope(tileh)) {

   211

		/* Test for inclined foundations */

   212

		if (bits == TRACK_BIT_X) return FOUNDATION_INCLINED_X;

   213

		if (bits == TRACK_BIT_Y) return FOUNDATION_INCLINED_Y;

   214

   215

		/* Get higher track */

   216

		Corner highest_corner = GetHighestSlopeCorner(tileh);

   217

		TrackBits higher_track = CornerToTrackBits(highest_corner);

   218

   219

		/* Only higher track? */

   220

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

   221

   222

		/* Overlap with higher track? */

   223

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

   224

   225

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

   226

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

   227

	} else {

   228

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

   229

   230

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

   231

   232

		Corner track_corner;

   233

		switch (bits) {

   234

			case TRACK_BIT_LEFT:  track_corner = CORNER_W; break;

   235

			case TRACK_BIT_LOWER: track_corner = CORNER_S; break;

   236

			case TRACK_BIT_RIGHT: track_corner = CORNER_E; break;

   237

			case TRACK_BIT_UPPER: track_corner = CORNER_N; break;

   238

   239

			case TRACK_BIT_HORZ:

   240

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

   241

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

   242

				return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);

   243

   244

			case TRACK_BIT_VERT:

   245

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

   246

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

   247

				return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);

   248

   249

			case TRACK_BIT_X:

   250

				if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_X;

   251

				return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);

   252

   253

			case TRACK_BIT_Y:

   254

				if (IsSlopeWithOneCornerRaised(tileh)) return FOUNDATION_INCLINED_Y;

   255

				return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);

   256

   257

			default:

   258

				return (valid_on_leveled ? FOUNDATION_LEVELED : FOUNDATION_INVALID);

   259

		}

   260

		/* Single diagonal track */

   261

   262

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

   263

		if (!valid_on_leveled) return FOUNDATION_INVALID;

   264

   265

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

   266

		if (IsSlopeWithThreeCornersRaised(tileh)) return FOUNDATION_LEVELED;

   267

   268

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

   269

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

   270

   271

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

   272

		return SpecialRailFoundation(track_corner);

   273

	}

   274

}

   275

   276

   277

/**

   278

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

   279

 *

   280

 * @param tileh Tile slope.

   281

 * @param rail_bits Tracks to build.

   282

 * @param existing Tracks already built.

   283

 * @param tile Tile (used for water test)

   284

 * @return Error message or cost for foundation building.

   285

 */

   286

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

   287

{

   288

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

   289

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

   290

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

   291

	}

   292

   293

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

   294

   295

	/* check track/slope combination */

   296

	if ((f_new == FOUNDATION_INVALID) ||

   297

			((f_new != FOUNDATION_NONE) && (!_settings_game.construction.build_on_slopes || _is_old_ai_player))) {

   298

		return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   299

	}

   300

   301

	Foundation f_old = GetRailFoundation(tileh, existing);

   302

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

   303

}

   304

   305

/* Validate functions for rail building */

   306

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

   307

   308

/** Build a single piece of rail

   309

 * @param tile tile  to build on

   310

 * @param flags operation to perform

   311

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

   312

 * @param p2 rail track to build

   313

 */

   314

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

   315

{

   316

	Slope tileh;

   317

	RailType railtype = (RailType)p1;

   318

	Track track = (Track)p2;

   319

	TrackBits trackbit;

   320

	CommandCost cost(EXPENSES_CONSTRUCTION);

   321

	CommandCost ret;

   322

   323

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

   324

   325

	tileh = GetTileSlope(tile, NULL);

   326

	trackbit = TrackToTrackBits(track);

   327

   328

	switch (GetTileType(tile)) {

   329

		case MP_RAILWAY:

   330

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

   331

					!EnsureNoTrainOnTrack(tile, track)) {

   332

				return CMD_ERROR;

   333

			}

   334

			if (!IsTileOwner(tile, _current_player) ||

   335

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

   336

				/* Get detailed error message */

   337

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

   338

			}

   339

   340

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

   341

			if (CmdFailed(ret)) return ret;

   342

			cost.AddCost(ret);

   343

   344

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

   345

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

   346

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

   347

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

   348

				if (CmdFailed(ret)) return ret;

   349

				cost.AddCost(ret);

   350

			}

   351

   352

			if (flags & DC_EXEC) {

   353

				SetRailGroundType(tile, RAIL_GROUND_BARREN);

   354

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

   355

			}

   356

			break;

   357

   358

		case MP_ROAD:

   359

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

   360

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

   361

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

   362

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   363

			}

   364

#undef M

   365

   366

			if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;

   367

   368

			if (IsNormalRoad(tile)) {

   369

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

   370

   371

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

   372

   373

				RoadTypes roadtypes = GetRoadTypes(tile);

   374

				RoadBits road = GetRoadBits(tile, ROADTYPE_ROAD);

   375

				RoadBits tram = GetRoadBits(tile, ROADTYPE_TRAM);

   376

				switch (roadtypes) {

   377

					default: break;

   378

					case ROADTYPES_TRAM:

   379

						/* Tram crossings must always have road. */

   380

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

   381

						roadtypes |= ROADTYPES_ROAD;

   382

						break;

   383

   384

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

   385

						/* FALL THROUGH */

   386

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

   387

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

   388

					case ROADTYPES_ALL:      // Also incompatible

   389

						return CMD_ERROR;

   390

				}

   391

   392

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

   393

   394

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

   395

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

   396

					if (flags & DC_EXEC) {

   397

						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));

   398

						UpdateLevelCrossing(tile, false);

   399

					}

   400

					break;

   401

				}

   402

			}

   403

   404

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

   405

				return_cmd_error(STR_1007_ALREADY_BUILT);

   406

			}

   407

			/* FALLTHROUGH */

   408

   409

		default:

   410

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

   411

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

   412

   413

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

   414

			if (CmdFailed(ret)) return ret;

   415

			cost.AddCost(ret);

   416

   417

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

   418

			if (CmdFailed(ret)) return ret;

   419

			cost.AddCost(ret);

   420

   421

			if (water_ground) {

   422

				cost.AddCost(-_price.clear_water);

   423

				cost.AddCost(_price.clear_roughland);

   424

			}

   425

   426

			if (flags & DC_EXEC) {

   427

				MakeRailNormal(tile, _current_player, trackbit, railtype);

   428

				if (water_ground) SetRailGroundType(tile, RAIL_GROUND_WATER);

   429

			}

   430

			break;

   431

	}

   432

   433

	if (flags & DC_EXEC) {

   434

		MarkTileDirtyByTile(tile);

   435

		AddTrackToSignalBuffer(tile, track, _current_player);

   436

		YapfNotifyTrackLayoutChange(tile, track);

   437

	}

   438

   439

	return cost.AddCost(RailBuildCost(railtype));

   440

}

   441

   442

/** Remove a single piece of track

   443

 * @param tile tile to remove track from

   444

 * @param flags operation to perform

   445

 * @param p1 unused

   446

 * @param p2 rail orientation

   447

 */

   448

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

   449

{

   450

	Track track = (Track)p2;

   451

	TrackBits trackbit;

   452

	CommandCost cost(EXPENSES_CONSTRUCTION, _price.remove_rail );

   453

	bool crossing = false;

   454

   455

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

   456

	trackbit = TrackToTrackBits(track);

   457

   458

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

   459

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

   460

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

   461

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

   462

	Owner owner = INVALID_OWNER;

   463

   464

	Vehicle *v = NULL;

   465

   466

	switch (GetTileType(tile)) {

   467

		case MP_ROAD: {

   468

			if (!IsLevelCrossing(tile) ||

   469

					GetCrossingRailBits(tile) != trackbit ||

   470

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

   471

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

   472

				return CMD_ERROR;

   473

			}

   474

   475

			if (flags & DC_EXEC) {

   476

				if (HasReservedTracks(tile, trackbit)) {

   477

					v = GetTrainForReservation(tile, track);

   478

					if (v != NULL) FreeTrainTrackReservation(v);

   479

				}

   480

				owner = GetTileOwner(tile);

   481

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

   482

			}

   483

			break;