1

/* $Id$ */

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     3

#include "stdafx.h"

     4

#include "openttd.h"

     5

#include "bridge_map.h"

     6

#include "debug.h"

     7

#include "functions.h"

     8

#include "rail_map.h"

     9

#include "road_map.h"

    10

#include "table/sprites.h"

    11

#include "table/strings.h"

    12

#include "map.h"

    13

#include "tile.h"

    14

#include "tunnel_map.h"

    15

#include "vehicle.h"

    16

#include "viewport.h"

    17

#include "command.h"

    18

#include "pathfind.h"

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#include "engine.h"

    20

#include "town.h"

    21

#include "sound.h"

    22

#include "station.h"

    23

#include "sprite.h"

    24

#include "depot.h"

    25

#include "waypoint.h"

    26

#include "rail.h"

    27

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

    28

    29

extern uint16 _custom_sprites_base;

    30

    31

const byte _track_sloped_sprites[14] = {

    32

	14, 15, 22, 13,

    33

	 0, 21, 17, 12,

    34

	23,  0, 18, 20,

    35

	19, 16

    36

};

    37

    38

void ShowTrainDepotWindow(TileIndex tile);

    39

    40

/* Format of rail map5 byte.

    41

 * 00 abcdef  => Normal rail

    42

 * 01 abcdef  => Rail with signals

    43

 * 10 ??????  => Unused

    44

 * 11 ????dd  => Depot

    45

 *

    46

 * abcdef is a bitmask, which contains ones for all present tracks. Below the

    47

 * value for each track is given.

    48

 */

    49

    50

/*         4

    51

 *     ---------

    52

 *    |\       /|

    53

 *    | \    1/ |

    54

 *    |  \   /  |

    55

 *    |   \ /   |

    56

 *  16|    \    |32

    57

 *    |   / \2  |

    58

 *    |  /   \  |

    59

 *    | /     \ |

    60

 *    |/       \|

    61

 *     ---------

    62

 *         8

    63

 */

    64

    65

    66

// Constants for lower part of Map2 byte.

    67

enum RailMap2Lower4 {

    68

	RAIL_MAP2LO_GROUND_MASK = 0xF,

    69

	RAIL_GROUND_BROWN = 0,

    70

	RAIL_GROUND_GREEN = 1,

    71

	RAIL_GROUND_FENCE_NW = 2,

    72

	RAIL_GROUND_FENCE_SE = 3,

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	RAIL_GROUND_FENCE_SENW = 4,

    74

	RAIL_GROUND_FENCE_NE = 5,

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	RAIL_GROUND_FENCE_SW = 6,

    76

	RAIL_GROUND_FENCE_NESW = 7,

    77

	RAIL_GROUND_FENCE_VERT1 = 8,

    78

	RAIL_GROUND_FENCE_VERT2 = 9,

    79

	RAIL_GROUND_FENCE_HORIZ1 = 10,

    80

	RAIL_GROUND_FENCE_HORIZ2 = 11,

    81

	RAIL_GROUND_ICE_DESERT = 12,

    82

};

    83

    84

    85

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

    86

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

    87

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

    88

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

    89

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

    90

 *				 similar for lower and right.

    91

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

    92

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

    93

 * MAP5:         00abcdef => rail

    94

 *               01abcdef => rail w/ signals

    95

 *               10uuuuuu => unused

    96

 *               11uuuudd => rail depot

    97

 */

    98

    99

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

   100

{

   101

	RailTileType type = GetRailTileType(tile);

   102

	TrackBits current; /* The current track layout */

   103

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

   104

	_error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;

   105

   106

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

   107

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

   108

   109

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

   110

	 * what tracks first */

   111

	current = GetTrackBits(tile);

   112

	future = current | to_build;

   113

   114

	/* Are we really building something new? */

   115

	if (current == future) {

   116

		/* Nothing new is being built */

   117

		_error_message = STR_1007_ALREADY_BUILT;

   118

		return false;

   119

	}

   120

   121

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

   122

	if ((flags & DC_NO_RAIL_OVERLAP) || type == RAIL_TYPE_SIGNALS) {

   123

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

   124

		 * signals on the tile), check that */

   125

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

   126

	} else {

   127

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

   128

		return true;

   129

	}

   130

}

   131

   132

   133

const TrackBits _valid_tileh_slopes[2][15] = {

   134

   135

// set of normal ones

   136

{

   137

	TRACK_BIT_ALL,

   138

	TRACK_BIT_RIGHT,

   139

	TRACK_BIT_UPPER,

   140

	TRACK_BIT_X,

   141

   142

	TRACK_BIT_LEFT,

   143

	0,

   144

	TRACK_BIT_Y,

   145

	TRACK_BIT_LOWER,

   146

   147

	TRACK_BIT_LOWER,

   148

	TRACK_BIT_Y,

   149

	0,

   150

	TRACK_BIT_LEFT,

   151

   152

	TRACK_BIT_X,

   153

	TRACK_BIT_UPPER,

   154

	TRACK_BIT_RIGHT,

   155

},

   156

   157

// allowed rail for an evenly raised platform

   158

{

   159

	0,

   160

	TRACK_BIT_LEFT,

   161

	TRACK_BIT_LOWER,

   162

	TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,

   163

   164

	TRACK_BIT_RIGHT,

   165

	TRACK_BIT_ALL,

   166

	TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,

   167

	TRACK_BIT_ALL,

   168

   169

	TRACK_BIT_UPPER,

   170

	TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,

   171

	TRACK_BIT_ALL,

   172

	TRACK_BIT_ALL,

   173

   174

	TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,

   175

	TRACK_BIT_ALL,

   176

	TRACK_BIT_ALL

   177

}

   178

};

   179

   180

uint GetRailFoundation(uint tileh, TrackBits bits)

   181

{

   182

	int i;

   183

   184

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

   185

		return 0;

   186

   187

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

   188

		return tileh;

   189

   190

	if ((

   191

				(i  = 0, tileh == 1) ||

   192

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

   193

				(i += 2, tileh == 4) ||

   194

				(i += 2, tileh == 8)

   195

			) && (

   196

				bits == TRACK_BIT_X ||

   197

				(i++, bits == TRACK_BIT_Y)

   198

			)) {

   199

		return i + 15;

   200

	} else {

   201

		return 0;

   202

	}

   203

}

   204

   205

   206

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

   207

{

   208

	// never allow building on top of steep tiles

   209

	if (!IsSteepTileh(tileh)) {

   210

		rail_bits |= existing;

   211

   212

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

   213

		if (IsTileType(tile, MP_WATER) &&

   214

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

   215

			return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   216

		}

   217

   218

		// no special foundation

   219

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

   220

			return 0;

   221

   222

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

   223

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

   224

					(tileh == 1 || tileh == 2 || tileh == 4 || tileh == 8)

   225

				)) { // partly up

   226

			if (existing != 0) {

   227

				return 0;

   228

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

   229

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   230

			} else {

   231

				return _price.terraform;

   232

			}

   233

		}

   234

	}

   235

	return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   236

}

   237

   238

/* Validate functions for rail building */

   239

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

   240

   241

/** Build a single piece of rail

   242

 * @param x,y coordinates on where to build

   243

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

   244

 * @param p2 rail track to build

   245

 */

   246

int32 CmdBuildSingleRail(int x, int y, uint32 flags, uint32 p1, uint32 p2)

   247

{

   248

	TileIndex tile;

   249

	uint tileh;

   250

	Track track = (Track)p2;

   251

	TrackBits trackbit;

   252

	int32 cost = 0;

   253

	int32 ret;

   254

   255

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

   256

   257

	tile = TileVirtXY(x, y);

   258

	tileh = GetTileSlope(tile, NULL);

   259

	trackbit = TrackToTrackBits(track);

   260

   261

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   262

   263

	switch (GetTileType(tile)) {

   264

		case MP_TUNNELBRIDGE:

   265

			if (!IsBridge(tile) ||

   266

					!IsBridgeMiddle(tile) ||

   267

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

   268

				// Get detailed error message

   269

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

   270

			}

   271

   272

			if (IsClearUnderBridge(tile)) {

   273

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

   274

				if (CmdFailed(ret)) return ret;

   275

				cost += ret;

   276

   277

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

   278

			} else if (IsTransportUnderBridge(tile) &&

   279

					GetTransportTypeUnderBridge(tile) == TRANSPORT_RAIL) {

   280

				return_cmd_error(STR_1007_ALREADY_BUILT);

   281

			} else {

   282

				// Get detailed error message

   283

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

   284

			}

   285

			break;

   286

   287

		case MP_RAILWAY:

   288

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

   289

					!EnsureNoVehicle(tile)) {

   290

				return CMD_ERROR;

   291

			}

   292

			if (GetRailTileType(tile) == RAIL_TYPE_DEPOT_WAYPOINT ||

   293

					!IsTileOwner(tile, _current_player) ||

   294

					GetRailType(tile) != p1) {

   295

				// Get detailed error message

   296

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

   297

			}

   298

   299

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

   300

			if (CmdFailed(ret)) return ret;

   301

			cost += ret;

   302

   303

			if (flags & DC_EXEC) {

   304

				_m[tile].m2 &= ~RAIL_MAP2LO_GROUND_MASK; // Bare land

   305

				_m[tile].m5 |= trackbit;

   306

			}

   307

			break;

   308

   309

		case MP_STREET:

   310

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

   311

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

   312

			if (!HASBIT(M(14) | M(13) | M(11) | M(10) | M(7) | M(5) | M(0), tileh)) {

   313

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   314

			}

   315

#undef M

   316

   317

			if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   318

   319

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

   320

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

   321

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

   322

					)) {

   323

				if (flags & DC_EXEC) {

   324

					MakeRoadCrossing(tile, GetTileOwner(tile), _current_player, (track == TRACK_X ? AXIS_Y : AXIS_X), p1, _m[tile].m2);

   325

				}

   326

				break;

   327

			}

   328

   329

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

   330

				return_cmd_error(STR_1007_ALREADY_BUILT);

   331

			}

   332

			/* FALLTHROUGH */

   333

   334

		default:

   335

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

   336

			if (CmdFailed(ret)) return ret;

   337

			cost += ret;

   338

   339

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

   340

			if (CmdFailed(ret)) return ret;

   341

			cost += ret;

   342

   343

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

   344

			break;

   345

	}

   346

   347

	if (flags & DC_EXEC) {

   348

		MarkTileDirtyByTile(tile);

   349

		SetSignalsOnBothDir(tile, track);

   350

	}

   351

   352

	return cost + _price.build_rail;

   353

}

   354

   355

/** Remove a single piece of track

   356

 * @param x,y coordinates for removal of track

   357

 * @param p1 unused

   358

 * @param p2 rail orientation

   359

 */

   360

int32 CmdRemoveSingleRail(int x, int y, uint32 flags, uint32 p1, uint32 p2)

   361

{

   362

	Track track = (Track)p2;

   363

	TrackBits trackbit;

   364

	TileIndex tile;

   365

	int32 cost = _price.remove_rail;

   366

	bool crossing = false;

   367

   368

	if (!ValParamTrackOrientation(p2)) return CMD_ERROR;

   369

	trackbit = TrackToTrackBits(track);

   370

   371

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   372

   373

	tile = TileVirtXY(x, y);

   374

   375

	switch (GetTileType(tile)) {

   376

		case MP_TUNNELBRIDGE:

   377

			if (!IsBridge(tile) ||

   378

					!IsBridgeMiddle(tile) ||

   379

					!IsTransportUnderBridge(tile) ||

   380

					GetTransportTypeUnderBridge(tile) != TRANSPORT_RAIL ||

   381

					GetRailBitsUnderBridge(tile) != trackbit ||

   382

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

   383

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

   384

				return CMD_ERROR;

   385

			}

   386

   387

			if (flags & DC_EXEC) SetClearUnderBridge(tile);

   388

			break;

   389

   390

		case MP_STREET: {

   391

			if (!IsLevelCrossing(tile) ||

   392

					GetCrossingRailBits(tile) != trackbit ||

   393

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

   394

					!EnsureNoVehicle(tile)) {

   395

				return CMD_ERROR;

   396

			}

   397

   398

			if (flags & DC_EXEC) {

   399

				MakeRoadNormal(tile, GetCrossingRoadOwner(tile), GetCrossingRoadBits(tile), _m[tile].m2);

   400

			}

   401

			break;

   402

		}

   403

   404

		case MP_RAILWAY: {

   405

			TrackBits present;

   406

   407

			if (!IsPlainRailTile(tile) ||

   408

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

   409

					!EnsureNoVehicle(tile)) {

   410

				return CMD_ERROR;

   411

			}

   412

   413

			present = GetTrackBits(tile);

   414

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

   415

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

   416

   417

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

   418

			if (HasSignalOnTrack(tile, track))

   419

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

   420

   421

			if (flags & DC_EXEC) {

   422

				present ^= trackbit;

   423

				if (present == 0) {

   424

					DoClearSquare(tile);

   425

				} else {

   426

					SetTrackBits(tile, present);

   427

				}

   428

			}

   429

			break;

   430

		}

   431

   432

		default: return CMD_ERROR;

   433

	}

   434

   435

	if (flags & DC_EXEC) {

   436

		MarkTileDirtyByTile(tile);

   437

		if (crossing) {

   438

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

   439

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

   440

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

   441

			 * 'connect' with the other piece. */

   442

			SetSignalsOnBothDir(tile, TRACK_X);

   443

			SetSignalsOnBothDir(tile, TRACK_Y);

   444

		} else {

   445

			SetSignalsOnBothDir(tile, track);

   446

		}

   447

	}

   448

   449

	return cost;

   450

}

   451

   452

static const struct {

   453

	int8 xinc[16];

   454

	int8 yinc[16];

   455

} _railbit = {{

   456

//  0   1   2   3   4   5

   457

	-16,  0,-16,  0, 16,  0,    0,  0,

   458

	 16,  0,  0, 16,  0,-16,    0,  0,

   459

},{

   460

	  0, 16,  0, 16,  0, 16,    0,  0,

   461

	  0,-16,-16,  0,-16,  0,    0,  0,

   462

}};

   463

   464

static int32 ValidateAutoDrag(Trackdir *trackdir, int x, int y, int ex, int ey)

   465

{

   466

	int dx, dy, trdx, trdy;

   467

   468

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

   469

   470

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

   471

	dx = ex - x;

   472

	dy = ey - y;

   473

   474

	// calculate delta x,y for the first direction

   475

	trdx = _railbit.xinc[*trackdir];

   476

	trdy = _railbit.yinc[*trackdir];

   477

   478

	if (!IsDiagonalTrackdir(*trackdir)) {

   479

		trdx += _railbit.xinc[*trackdir ^ 1];

   480

		trdy += _railbit.yinc[*trackdir ^ 1];

   481

	}

   482

   483

	// validate the direction

   484

	while (

   485

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

   486

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

   487

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

   488

		(trdy >= 0 && dy < 0)

   489

	) {

   490

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