1

/* $Id$ */

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#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 "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"

    18

#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"

    26

#include "waypoint.h"

    27

#include "rail.h"

    28

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

    29

    30

extern uint16 _custom_sprites_base;

    31

    32

const byte _track_sloped_sprites[14] = {

    33

	14, 15, 22, 13,

    34

	 0, 21, 17, 12,

    35

	23,  0, 18, 20,

    36

	19, 16

    37

};

    38

    39

void ShowTrainDepotWindow(TileIndex tile);

    40

    41

/*         4

    42

 *     ---------

    43

 *    |\       /|

    44

 *    | \    1/ |

    45

 *    |  \   /  |

    46

 *    |   \ /   |

    47

 *  16|    \    |32

    48

 *    |   / \2  |

    49

 *    |  /   \  |

    50

 *    | /     \ |

    51

 *    |/       \|

    52

 *     ---------

    53

 *         8

    54

 */

    55

    56

    57

// Constants for lower part of Map2 byte.

    58

enum RailMap2Lower4 {

    59

	RAIL_MAP2LO_GROUND_MASK = 0xF,

    60

	RAIL_GROUND_BROWN = 0,

    61

	RAIL_GROUND_GREEN = 1,

    62

	RAIL_GROUND_FENCE_NW = 2,

    63

	RAIL_GROUND_FENCE_SE = 3,

    64

	RAIL_GROUND_FENCE_SENW = 4,

    65

	RAIL_GROUND_FENCE_NE = 5,

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	RAIL_GROUND_FENCE_SW = 6,

    67

	RAIL_GROUND_FENCE_NESW = 7,

    68

	RAIL_GROUND_FENCE_VERT1 = 8,

    69

	RAIL_GROUND_FENCE_VERT2 = 9,

    70

	RAIL_GROUND_FENCE_HORIZ1 = 10,

    71

	RAIL_GROUND_FENCE_HORIZ2 = 11,

    72

	RAIL_GROUND_ICE_DESERT = 12,

    73

};

    74

    75

    76

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

    77

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

    78

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

    79

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

    80

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

    81

 *				 similar for lower and right.

    82

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

    83

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

    84

 * MAP5:         00abcdef => rail

    85

 *               01abcdef => rail w/ signals

    86

 *               10uuuuuu => unused

    87

 *               11uuuudd => rail depot

    88

 */

    89

    90

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

    91

{

    92

	RailTileType type = GetRailTileType(tile);

    93

	TrackBits current; /* The current track layout */

    94

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

    95

	_error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;

    96

    97

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

    98

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

    99

   100

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

   101

	 * what tracks first */

   102

	current = GetTrackBits(tile);

   103

	future = current | to_build;

   104

   105

	/* Are we really building something new? */

   106

	if (current == future) {

   107

		/* Nothing new is being built */

   108

		_error_message = STR_1007_ALREADY_BUILT;

   109

		return false;

   110

	}

   111

   112

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

   113

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

   114

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

   115

		 * signals on the tile), check that */

   116

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

   117

	} else {

   118

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

   119

		return true;

   120

	}

   121

}

   122

   123

   124

const TrackBits _valid_tileh_slopes[2][15] = {

   125

   126

// set of normal ones

   127

{

   128

	TRACK_BIT_ALL,

   129

	TRACK_BIT_RIGHT,

   130

	TRACK_BIT_UPPER,

   131

	TRACK_BIT_X,

   132

   133

	TRACK_BIT_LEFT,

   134

	0,

   135

	TRACK_BIT_Y,

   136

	TRACK_BIT_LOWER,

   137

   138

	TRACK_BIT_LOWER,

   139

	TRACK_BIT_Y,

   140

	0,

   141

	TRACK_BIT_LEFT,

   142

   143

	TRACK_BIT_X,

   144

	TRACK_BIT_UPPER,

   145

	TRACK_BIT_RIGHT,

   146

},

   147

   148

// allowed rail for an evenly raised platform

   149

{

   150

	0,

   151

	TRACK_BIT_LEFT,

   152

	TRACK_BIT_LOWER,

   153

	TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,

   154

   155

	TRACK_BIT_RIGHT,

   156

	TRACK_BIT_ALL,

   157

	TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,

   158

	TRACK_BIT_ALL,

   159

   160

	TRACK_BIT_UPPER,

   161

	TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,

   162

	TRACK_BIT_ALL,

   163

	TRACK_BIT_ALL,

   164

   165

	TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,

   166

	TRACK_BIT_ALL,

   167

	TRACK_BIT_ALL

   168

}

   169

};

   170

   171

uint GetRailFoundation(uint tileh, TrackBits bits)

   172

{

   173

	int i;

   174

   175

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

   176

		return 0;

   177

   178

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

   179

		return tileh;

   180

   181

	if ((

   182

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

   183

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

   184

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

   185

				(i += 2, tileh == 8)

   186

			) && (

   187

				bits == TRACK_BIT_X ||

   188

				(i++, bits == TRACK_BIT_Y)

   189

			)) {

   190

		return i + 15;

   191

	} else {

   192

		return 0;

   193

	}

   194

}

   195

   196

   197

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

   198

{

   199

	// never allow building on top of steep tiles

   200

	if (!IsSteepTileh(tileh)) {

   201

		rail_bits |= existing;

   202

   203

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

   204

		if (IsTileType(tile, MP_WATER) &&

   205

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

   206

			return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   207

		}

   208

   209

		// no special foundation

   210

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

   211

			return 0;

   212

   213

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

   214

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

   215

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

   216

				)) { // partly up

   217

			if (existing != 0) {

   218

				return 0;

   219

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

   220

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   221

			} else {

   222

				return _price.terraform;

   223

			}

   224

		}

   225

	}

   226

	return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   227

}

   228

   229

/* Validate functions for rail building */

   230

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

   231

   232

/** Build a single piece of rail

   233

 * @param x,y coordinates on where to build

   234

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

   235

 * @param p2 rail track to build

   236

 */

   237

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

   238

{

   239

	TileIndex tile;

   240

	uint tileh;

   241

	Track track = (Track)p2;

   242

	TrackBits trackbit;

   243

	int32 cost = 0;

   244

	int32 ret;

   245

   246

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

   247

   248

	tile = TileVirtXY(x, y);

   249

	tileh = GetTileSlope(tile, NULL);

   250

	trackbit = TrackToTrackBits(track);

   251

   252

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   253

   254

	switch (GetTileType(tile)) {

   255

		case MP_TUNNELBRIDGE:

   256

			if (!IsBridge(tile) ||

   257

					!IsBridgeMiddle(tile) ||

   258

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

   259

				// Get detailed error message

   260

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

   261

			}

   262

   263

			if (IsClearUnderBridge(tile)) {

   264

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

   265

				if (CmdFailed(ret)) return ret;

   266

				cost += ret;

   267

   268

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

   269

			} else if (IsTransportUnderBridge(tile) &&

   270

					GetTransportTypeUnderBridge(tile) == TRANSPORT_RAIL) {

   271

				return_cmd_error(STR_1007_ALREADY_BUILT);

   272

			} else {

   273

				// Get detailed error message

   274

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

   275

			}

   276

			break;

   277

   278

		case MP_RAILWAY:

   279

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

   280

					!EnsureNoVehicle(tile)) {

   281

				return CMD_ERROR;

   282

			}

   283

			if (GetRailTileType(tile) == RAIL_TYPE_DEPOT_WAYPOINT ||

   284

					!IsTileOwner(tile, _current_player) ||

   285

					GetRailType(tile) != p1) {

   286

				// Get detailed error message

   287

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

   288

			}

   289

   290

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

   291

			if (CmdFailed(ret)) return ret;

   292

			cost += ret;

   293

   294

			if (flags & DC_EXEC) {

   295

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

   296

				_m[tile].m5 |= trackbit;

   297

			}

   298

			break;

   299

   300

		case MP_STREET:

   301

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

   302

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

   303

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

   304

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   305

			}

   306

#undef M

   307

   308

			if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   309

   310

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

   311

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

   312

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

   313

					)) {

   314

				if (flags & DC_EXEC) {

   315

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

   316

				}

   317

				break;

   318

			}

   319

   320

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

   321

				return_cmd_error(STR_1007_ALREADY_BUILT);

   322

			}

   323

			/* FALLTHROUGH */

   324

   325

		default:

   326

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

   327

			if (CmdFailed(ret)) return ret;

   328

			cost += ret;

   329

   330

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

   331

			if (CmdFailed(ret)) return ret;

   332

			cost += ret;

   333

   334

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

   335

			break;

   336

	}

   337

   338

	if (flags & DC_EXEC) {

   339

		MarkTileDirtyByTile(tile);

   340

		SetSignalsOnBothDir(tile, track);

   341

	}

   342

   343

	return cost + _price.build_rail;

   344

}

   345

   346

/** Remove a single piece of track

   347

 * @param x,y coordinates for removal of track

   348

 * @param p1 unused

   349

 * @param p2 rail orientation

   350

 */

   351

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

   352

{

   353

	Track track = (Track)p2;

   354

	TrackBits trackbit;

   355

	TileIndex tile;

   356

	int32 cost = _price.remove_rail;

   357

	bool crossing = false;

   358

   359

	if (!ValParamTrackOrientation(p2)) return CMD_ERROR;

   360

	trackbit = TrackToTrackBits(track);

   361

   362

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   363

   364

	tile = TileVirtXY(x, y);

   365

   366

	switch (GetTileType(tile)) {

   367

		case MP_TUNNELBRIDGE:

   368

			if (!IsBridge(tile) ||

   369

					!IsBridgeMiddle(tile) ||

   370

					!IsTransportUnderBridge(tile) ||

   371

					GetTransportTypeUnderBridge(tile) != TRANSPORT_RAIL ||

   372

					GetRailBitsUnderBridge(tile) != trackbit ||

   373

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

   374

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

   375

				return CMD_ERROR;

   376

			}

   377

   378

			if (flags & DC_EXEC) SetClearUnderBridge(tile);

   379

			break;

   380

   381

		case MP_STREET: {

   382

			if (!IsLevelCrossing(tile) ||

   383

					GetCrossingRailBits(tile) != trackbit ||

   384

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

   385

					!EnsureNoVehicle(tile)) {

   386

				return CMD_ERROR;

   387

			}

   388

   389

			if (flags & DC_EXEC) {

   390

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

   391

			}

   392

			break;

   393

		}

   394

   395

		case MP_RAILWAY: {

   396

			TrackBits present;

   397

   398

			if (!IsPlainRailTile(tile) ||

   399

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

   400

					!EnsureNoVehicle(tile)) {

   401

				return CMD_ERROR;

   402

			}

   403

   404

			present = GetTrackBits(tile);

   405

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

   406

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

   407

   408

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

   409

			if (HasSignalOnTrack(tile, track))

   410

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

   411

   412

			if (flags & DC_EXEC) {

   413

				present ^= trackbit;

   414

				if (present == 0) {

   415

					DoClearSquare(tile);

   416

				} else {

   417

					SetTrackBits(tile, present);

   418

				}

   419

			}

   420

			break;

   421

		}

   422

   423

		default: return CMD_ERROR;

   424

	}

   425

   426

	if (flags & DC_EXEC) {

   427

		MarkTileDirtyByTile(tile);

   428

		if (crossing) {

   429

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

   430

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

   431

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

   432

			 * 'connect' with the other piece. */

   433

			SetSignalsOnBothDir(tile, TRACK_X);

   434

			SetSignalsOnBothDir(tile, TRACK_Y);

   435

		} else {

   436

			SetSignalsOnBothDir(tile, track);

   437

		}

   438

	}

   439

   440

	return cost;

   441

}

   442

   443

static const struct {

   444

	int8 xinc[16];

   445

	int8 yinc[16];

   446

} _railbit = {{

   447

//  0   1   2   3   4   5

   448

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

   449

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

   450

},{

   451

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

   452

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

   453

}};

   454

   455

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

   456

{

   457

	int dx, dy, trdx, trdy;

   458

   459

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

   460

   461

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

   462

	dx = ex - x;

   463

	dy = ey - y;

   464

   465

	// calculate delta x,y for the first direction

   466

	trdx = _railbit.xinc[*trackdir];

   467

	trdy = _railbit.yinc[*trackdir];

   468

   469

	if (!IsDiagonalTrackdir(*trackdir)) {

   470

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

   471

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

   472

	}

   473

   474

	// validate the direction

   475

	while (

   476

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

   477

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

   478

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

   479

		(trdy >= 0 && dy < 0)

   480

	) {

   481

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

   482

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

   483

			trdx = -trdx;

   484

			trdy = -trdy;

   485

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

   486

			return CMD_ERROR;

   487

	}

   488

   489

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

   490

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