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/* $Id$ */

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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"

    17

#include "viewport.h"

    18

#include "command.h"

    19

#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"

    27

#include "window.h"

    28

#include "rail.h"

    29

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

    30

#include "newgrf.h"

    31

#include "yapf/yapf.h"

    32

#include "newgrf_callbacks.h"

    33

#include "newgrf_station.h"

    34

#include "train.h"

    35

    36

const byte _track_sloped_sprites[14] = {

    37

	14, 15, 22, 13,

    38

	 0, 21, 17, 12,

    39

	23,  0, 18, 20,

    40

	19, 16

    41

};

    42

    43

    44

/*         4

    45

 *     ---------

    46

 *    |\       /|

    47

 *    | \    1/ |

    48

 *    |  \   /  |

    49

 *    |   \ /   |

    50

 *  16|    \    |32

    51

 *    |   / \2  |

    52

 *    |  /   \  |

    53

 *    | /     \ |

    54

 *    |/       \|

    55

 *     ---------

    56

 *         8

    57

 */

    58

    59

    60

    61

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

    62

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

    63

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

    64

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

    65

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

    66

 *               similar for lower and right.

    67

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

    68

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

    69

 * MAP5:         00abcdef => rail

    70

 *               01abcdef => rail w/ signals

    71

 *               10uuuuuu => unused

    72

 *               11uuuudd => rail depot

    73

 */

    74

    75

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

    76

{

    77

	TrackBits current; /* The current track layout */

    78

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

    79

	_error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;

    80

    81

	if (!IsPlainRailTile(tile)) return false;

    82

    83

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

    84

	 * what tracks first */

    85

	current = GetTrackBits(tile);

    86

	future = current | to_build;

    87

    88

	/* Are we really building something new? */

    89

	if (current == future) {

    90

		/* Nothing new is being built */

    91

		_error_message = STR_1007_ALREADY_BUILT;

    92

		return false;

    93

	}

    94

    95

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

    96

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

    97

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

    98

		 * signals on the tile), check that */

    99

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

   100

	} else {

   101

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

   102

		return true;

   103

	}

   104

}

   105

   106

   107

static const TrackBits _valid_tileh_slopes[][15] = {

   108

   109

// set of normal ones

   110

{

   111

	TRACK_BIT_ALL,

   112

	TRACK_BIT_RIGHT,

   113

	TRACK_BIT_UPPER,

   114

	TRACK_BIT_X,

   115

   116

	TRACK_BIT_LEFT,

   117

	0,

   118

	TRACK_BIT_Y,

   119

	TRACK_BIT_LOWER,

   120

   121

	TRACK_BIT_LOWER,

   122

	TRACK_BIT_Y,

   123

	0,

   124

	TRACK_BIT_LEFT,

   125

   126

	TRACK_BIT_X,

   127

	TRACK_BIT_UPPER,

   128

	TRACK_BIT_RIGHT,

   129

},

   130

   131

// allowed rail for an evenly raised platform

   132

{

   133

	0,

   134

	TRACK_BIT_LEFT,

   135

	TRACK_BIT_LOWER,

   136

	TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,

   137

   138

	TRACK_BIT_RIGHT,

   139

	TRACK_BIT_ALL,

   140

	TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,

   141

	TRACK_BIT_ALL,

   142

   143

	TRACK_BIT_UPPER,

   144

	TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,

   145

	TRACK_BIT_ALL,

   146

	TRACK_BIT_ALL,

   147

   148

	TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,

   149

	TRACK_BIT_ALL,

   150

	TRACK_BIT_ALL

   151

}

   152

};

   153

   154

uint GetRailFoundation(Slope tileh, TrackBits bits)

   155

{

   156

	uint i;

   157

   158

	if (!IsSteepSlope(tileh)) {

   159

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

   160

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

   161

	}

   162

   163

	switch (bits) {

   164

		default: NOT_REACHED();

   165

		case TRACK_BIT_X: i = 0; break;

   166

		case TRACK_BIT_Y: i = 1; break;

   167

		case TRACK_BIT_LEFT:  return 15 + 8 + (tileh == SLOPE_STEEP_W ? 4 : 0);

   168

		case TRACK_BIT_LOWER: return 15 + 8 + (tileh == SLOPE_STEEP_S ? 5 : 1);

   169

		case TRACK_BIT_RIGHT: return 15 + 8 + (tileh == SLOPE_STEEP_E ? 6 : 2);

   170

		case TRACK_BIT_UPPER: return 15 + 8 + (tileh == SLOPE_STEEP_N ? 7 : 3);

   171

	}

   172

	switch (tileh) {

   173

		case SLOPE_W:

   174

		case SLOPE_STEEP_W: i += 0; break;

   175

		case SLOPE_S:

   176

		case SLOPE_STEEP_S: i += 2; break;

   177

		case SLOPE_E:

   178

		case SLOPE_STEEP_E: i += 4; break;

   179

		case SLOPE_N:

   180

		case SLOPE_STEEP_N: i += 6; break;

   181

		default: return 0;

   182

	}

   183

	return i + 15;

   184

}

   185

   186

   187

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

   188

{

   189

	if (IsSteepSlope(tileh)) {

   190

		if (existing == 0) {

   191

			TrackBits valid = TRACK_BIT_CROSS | (HASBIT(1 << SLOPE_STEEP_W | 1 << SLOPE_STEEP_E, tileh) ? TRACK_BIT_VERT : TRACK_BIT_HORZ);

   192

			if (valid & rail_bits) return _price.terraform;

   193

		}

   194

	} else {

   195

		rail_bits |= existing;

   196

   197

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

   198

		if (IsTileType(tile, MP_WATER) &&

   199

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

   200

			return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   201

		}

   202

   203

		// no special foundation

   204

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

   205

			return 0;

   206

   207

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

   208

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

   209

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

   210

				)) { // partly up

   211

			if (existing != 0) {

   212

				return 0;

   213

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

   214

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   215

			} else {

   216

				return _price.terraform;

   217

			}

   218

		}

   219

	}

   220

	return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   221

}

   222

   223

/* Validate functions for rail building */

   224

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

   225

   226

/** Build a single piece of rail

   227

 * @param tile tile  to build on

   228

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

   229

 * @param p2 rail track to build

   230

 */

   231

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

   232

{

   233

	Slope tileh;

   234

	Track track = (Track)p2;

   235

	TrackBits trackbit;

   236

	int32 cost = 0;

   237

	int32 ret;

   238

   239

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

   240

   241

	tileh = GetTileSlope(tile, NULL);

   242

	trackbit = TrackToTrackBits(track);

   243

   244

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   245

   246

	switch (GetTileType(tile)) {

   247

		case MP_TUNNELBRIDGE:

   248

			if (!IsBridge(tile) ||

   249

					!IsBridgeMiddle(tile) ||

   250

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

   251

				// Get detailed error message

   252

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

   253

			}

   254

   255

			if (IsClearUnderBridge(tile)) {

   256

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

   257

				if (CmdFailed(ret)) return ret;

   258

				cost += ret;

   259

   260

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

   261

			} else if (IsTransportUnderBridge(tile) &&

   262

					GetTransportTypeUnderBridge(tile) == TRANSPORT_RAIL) {

   263

				return_cmd_error(STR_1007_ALREADY_BUILT);

   264

			} else {

   265

				// Get detailed error message

   266

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

   267

			}

   268

			break;

   269

   270

		case MP_RAILWAY:

   271

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

   272

					!EnsureNoVehicle(tile)) {

   273

				return CMD_ERROR;

   274

			}

   275

			if (!IsTileOwner(tile, _current_player) ||

   276

					GetRailType(tile) != p1) {

   277

				// Get detailed error message

   278

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

   279

			}

   280

   281

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

   282

			if (CmdFailed(ret)) return ret;

   283

			cost += ret;

   284

   285

			if (flags & DC_EXEC) {

   286

				SetRailGroundType(tile, RAIL_GROUND_BARREN);

   287

				_m[tile].m5 |= trackbit;

   288

			}

   289

			break;

   290

   291

		case MP_STREET:

   292

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

   293

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

   294

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

   295

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   296

			}

   297

#undef M

   298

   299

			if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   300

   301

			if (GetRoadTileType(tile) == ROAD_TILE_NORMAL) {

   302

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

   303

   304

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

   305

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

   306

					if (flags & DC_EXEC) {

   307

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

   308

					}

   309

					break;

   310

				}

   311

			}

   312

   313

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

   314

				return_cmd_error(STR_1007_ALREADY_BUILT);

   315

			}

   316

			/* FALLTHROUGH */

   317

   318

		default:

   319

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

   320

			if (CmdFailed(ret)) return ret;

   321

			cost += ret;

   322

   323

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

   324

			if (CmdFailed(ret)) return ret;

   325

			cost += ret;

   326

   327

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

   328

			break;

   329

	}

   330

   331

	if (flags & DC_EXEC) {

   332

		MarkTileDirtyByTile(tile);

   333

		SetSignalsOnBothDir(tile, track);

   334

		YapfNotifyTrackLayoutChange(tile, track);

   335

	}

   336

   337

	return cost + _price.build_rail;

   338

}

   339

   340

/** Remove a single piece of track

   341

 * @param tile tile to remove track from

   342

 * @param p1 unused

   343

 * @param p2 rail orientation

   344

 */

   345

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

   346

{

   347

	Track track = (Track)p2;

   348

	TrackBits trackbit;

   349

	int32 cost = _price.remove_rail;

   350

	bool crossing = false;

   351

   352

	if (!ValParamTrackOrientation(p2)) return CMD_ERROR;

   353

	trackbit = TrackToTrackBits(track);

   354

   355

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   356

   357

	switch (GetTileType(tile)) {

   358

		case MP_TUNNELBRIDGE:

   359

			if (!IsBridge(tile) ||

   360

					!IsBridgeMiddle(tile) ||

   361

					!IsTransportUnderBridge(tile) ||

   362

					GetTransportTypeUnderBridge(tile) != TRANSPORT_RAIL ||

   363

					GetRailBitsUnderBridge(tile) != trackbit ||

   364

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

   365

					!EnsureNoVehicleOnGround(tile)) {

   366

				return CMD_ERROR;

   367

			}

   368

   369

			if (flags & DC_EXEC) SetClearUnderBridge(tile);

   370

			break;

   371

   372

		case MP_STREET: {

   373

			if (!IsLevelCrossing(tile) ||

   374

					GetCrossingRailBits(tile) != trackbit ||

   375

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

   376

					!EnsureNoVehicle(tile)) {

   377

				return CMD_ERROR;

   378

			}

   379

   380

			if (flags & DC_EXEC) {

   381

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

   382

			}

   383

			break;

   384

		}

   385

   386

		case MP_RAILWAY: {

   387

			TrackBits present;

   388

   389

			if (!IsPlainRailTile(tile) ||

   390

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

   391

					!EnsureNoVehicle(tile)) {

   392

				return CMD_ERROR;

   393

			}

   394

   395

			present = GetTrackBits(tile);

   396

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

   397

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

   398

   399

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

   400

			if (HasSignalOnTrack(tile, track))

   401

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

   402

   403

			if (flags & DC_EXEC) {

   404

				present ^= trackbit;

   405

				if (present == 0) {

   406

					DoClearSquare(tile);

   407

				} else {

   408

					SetTrackBits(tile, present);

   409

				}

   410

			}

   411

			break;

   412

		}

   413

   414

		default: return CMD_ERROR;

   415

	}

   416

   417

	if (flags & DC_EXEC) {

   418

		MarkTileDirtyByTile(tile);

   419

		if (crossing) {

   420

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

   421

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

   422

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

   423

			 * 'connect' with the other piece. */

   424

			SetSignalsOnBothDir(tile, TRACK_X);

   425

			SetSignalsOnBothDir(tile, TRACK_Y);

   426

			YapfNotifyTrackLayoutChange(tile, TRACK_X);

   427

			YapfNotifyTrackLayoutChange(tile, TRACK_Y);

   428

		} else {

   429

			SetSignalsOnBothDir(tile, track);

   430

			YapfNotifyTrackLayoutChange(tile, track);

   431

		}

   432

	}

   433

   434

	return cost;

   435

}

   436

   437

   438

static const TileIndexDiffC _trackdelta[] = {

   439

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

   440

	{  0,  0 },

   441

	{  0,  0 },

   442

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

   443

	{  0,  0 },

   444

	{  0,  0 }

   445

};

   446

   447

   448

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

   449

{

   450

	int x = TileX(start);

   451

	int y = TileY(start);

   452

	int ex = TileX(end);

   453

	int ey = TileY(end);

   454

	int dx, dy, trdx, trdy;

   455

   456

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

   457

   458

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

   459

	dx = ex - x;

   460

	dy = ey - y;

   461

   462

	// calculate delta x,y for the first direction

   463

	trdx = _trackdelta[*trackdir].x;

   464

	trdy = _trackdelta[*trackdir].y;

   465

   466

	if (!IsDiagonalTrackdir(*trackdir)) {

   467

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

   468

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

   469

	}

   470

   471

	// validate the direction

   472

	while (

   473

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

   474

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

   475

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

   476

		(trdy >= 0 && dy < 0)

   477

	) {

   478

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

   479

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

   480

			trdx = -trdx;

   481

			trdy = -trdy;

   482

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

   483

			return CMD_ERROR;

   484

		}

   485

	}

   486

   487

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