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/* $Id$ */

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#include "stdafx.h"

     4

#include "openttd.h"

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#include "bridge_map.h"

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#include "debug.h"

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#include "functions.h"

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#include "rail_map.h"

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#include "road_map.h"

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#include "table/sprites.h"

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#include "table/strings.h"

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#include "map.h"

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#include "tile.h"

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#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"

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#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"

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#include "waypoint.h"

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#include "rail.h"

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

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#include "newgrf.h"

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#include "yapf/yapf.h"

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#include "newgrf_callbacks.h"

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#include "newgrf_station.h"

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    34

const byte _track_sloped_sprites[14] = {

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	14, 15, 22, 13,

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	 0, 21, 17, 12,

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	23,  0, 18, 20,

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	19, 16

    39

};

    40

    41

void ShowTrainDepotWindow(TileIndex tile);

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    43

/*         4

    44

 *     ---------

    45

 *    |\       /|

    46

 *    | \    1/ |

    47

 *    |  \   /  |

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 *    |   \ /   |

    49

 *  16|    \    |32

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 *    |   / \2  |

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 *    |  /   \  |

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 *    | /     \ |

    53

 *    |/       \|

    54

 *     ---------

    55

 *         8

    56

 */

    57

    58

    59

    60

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

    61

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

    62

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

    63

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

    64

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

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 *				 similar for lower and right.

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

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

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 * MAP5:         00abcdef => rail

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 *               01abcdef => rail w/ signals

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 *               10uuuuuu => unused

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 *               11uuuudd => rail depot

    72

 */

    73

    74

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

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{

    76

	TrackBits current; /* The current track layout */

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

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	_error_message = STR_1001_IMPOSSIBLE_TRACK_COMBINATION;

    79

    80

	if (!IsPlainRailTile(tile)) return false;

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    82

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

    83

	 * what tracks first */

    84

	current = GetTrackBits(tile);

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	future = current | to_build;

    86

    87

	/* Are we really building something new? */

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	if (current == future) {

    89

		/* Nothing new is being built */

    90

		_error_message = STR_1007_ALREADY_BUILT;

    91

		return false;

    92

	}

    93

    94

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

    95

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

    96

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

    97

		 * signals on the tile), check that */

    98

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

    99

	} else {

   100

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

   101

		return true;

   102

	}

   103

}

   104

   105

   106

static const TrackBits _valid_tileh_slopes[][15] = {

   107

   108

// set of normal ones

   109

{

   110

	TRACK_BIT_ALL,

   111

	TRACK_BIT_RIGHT,

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	TRACK_BIT_UPPER,

   113

	TRACK_BIT_X,

   114

   115

	TRACK_BIT_LEFT,

   116

	0,

   117

	TRACK_BIT_Y,

   118

	TRACK_BIT_LOWER,

   119

   120

	TRACK_BIT_LOWER,

   121

	TRACK_BIT_Y,

   122

	0,

   123

	TRACK_BIT_LEFT,

   124

   125

	TRACK_BIT_X,

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	TRACK_BIT_UPPER,

   127

	TRACK_BIT_RIGHT,

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},

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   130

// allowed rail for an evenly raised platform

   131

{

   132

	0,

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	TRACK_BIT_LEFT,

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	TRACK_BIT_LOWER,

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	TRACK_BIT_Y | TRACK_BIT_LOWER | TRACK_BIT_LEFT,

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   137

	TRACK_BIT_RIGHT,

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	TRACK_BIT_ALL,

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	TRACK_BIT_X | TRACK_BIT_LOWER | TRACK_BIT_RIGHT,

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	TRACK_BIT_ALL,

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   142

	TRACK_BIT_UPPER,

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	TRACK_BIT_X | TRACK_BIT_UPPER | TRACK_BIT_LEFT,

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	TRACK_BIT_ALL,

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	TRACK_BIT_ALL,

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   147

	TRACK_BIT_Y | TRACK_BIT_UPPER | TRACK_BIT_RIGHT,

   148

	TRACK_BIT_ALL,

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	TRACK_BIT_ALL

   150

}

   151

};

   152

   153

uint GetRailFoundation(Slope tileh, TrackBits bits)

   154

{

   155

	uint i;

   156

   157

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

   158

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

   159

   160

	switch (bits) {

   161

		case TRACK_BIT_X: i = 0; break;

   162

		case TRACK_BIT_Y: i = 1; break;

   163

		default:          return 0;

   164

	}

   165

	switch (tileh) {

   166

		case SLOPE_W: i += 0; break;

   167

		case SLOPE_S: i += 2; break;

   168

		case SLOPE_E: i += 4; break;

   169

		case SLOPE_N: i += 6; break;

   170

		default:      return 0;

   171

	}

   172

	return i + 15;

   173

}

   174

   175

   176

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

   177

{

   178

	// never allow building on top of steep tiles

   179

	if (!IsSteepSlope(tileh)) {

   180

		rail_bits |= existing;

   181

   182

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

   183

		if (IsTileType(tile, MP_WATER) &&

   184

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

   185

			return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   186

		}

   187

   188

		// no special foundation

   189

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

   190

			return 0;

   191

   192

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

   193

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

   194

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

   195

				)) { // partly up

   196

			if (existing != 0) {

   197

				return 0;

   198

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

   199

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   200

			} else {

   201

				return _price.terraform;

   202

			}

   203

		}

   204

	}

   205

	return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   206

}

   207

   208

/* Validate functions for rail building */

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

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   211

/** Build a single piece of rail

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 * @param tile tile  to build on

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

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 * @param p2 rail track to build

   215

 */

   216

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

   217

{

   218

	Slope tileh;

   219

	Track track = (Track)p2;

   220

	TrackBits trackbit;

   221

	int32 cost = 0;

   222

	int32 ret;

   223

   224

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

   225

   226

	tileh = GetTileSlope(tile, NULL);

   227

	trackbit = TrackToTrackBits(track);

   228

   229

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   230

   231

	switch (GetTileType(tile)) {

   232

		case MP_TUNNELBRIDGE:

   233

			if (!IsBridge(tile) ||

   234

					!IsBridgeMiddle(tile) ||

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

   236

				// Get detailed error message

   237

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

   238

			}

   239

   240

			if (IsClearUnderBridge(tile)) {

   241

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

   242

				if (CmdFailed(ret)) return ret;

   243

				cost += ret;

   244

   245

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

   246

			} else if (IsTransportUnderBridge(tile) &&

   247

					GetTransportTypeUnderBridge(tile) == TRANSPORT_RAIL) {

   248

				return_cmd_error(STR_1007_ALREADY_BUILT);

   249

			} else {

   250

				// Get detailed error message

   251

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

   252

			}

   253

			break;

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   255

		case MP_RAILWAY:

   256

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

   257

					!EnsureNoVehicle(tile)) {

   258

				return CMD_ERROR;

   259

			}

   260

			if (!IsTileOwner(tile, _current_player) ||

   261

					GetRailType(tile) != p1) {

   262

				// Get detailed error message

   263

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

   264

			}

   265

   266

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

   267

			if (CmdFailed(ret)) return ret;

   268

			cost += ret;

   269

   270

			if (flags & DC_EXEC) {

   271

				SetRailGroundType(tile, RAIL_GROUND_BARREN);

   272

				_m[tile].m5 |= trackbit;

   273

			}

   274

			break;

   275

   276

		case MP_STREET:

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

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

   279

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

   280

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   281

			}

   282

#undef M

   283

   284

			if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   285

   286

			if (GetRoadTileType(tile) == ROAD_TILE_NORMAL) {

   287

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

   288

   289

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

   290

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

   291

					if (flags & DC_EXEC) {

   292

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

   293

					}

   294

					break;

   295

				}

   296

			}

   297

   298

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

   299

				return_cmd_error(STR_1007_ALREADY_BUILT);

   300

			}

   301

			/* FALLTHROUGH */

   302

   303

		default:

   304

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

   305

			if (CmdFailed(ret)) return ret;

   306

			cost += ret;

   307

   308

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

   309

			if (CmdFailed(ret)) return ret;

   310

			cost += ret;

   311

   312

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

   313

			break;

   314

	}

   315

   316

	if (flags & DC_EXEC) {

   317

		MarkTileDirtyByTile(tile);

   318

		SetSignalsOnBothDir(tile, track);

   319

		YapfNotifyTrackLayoutChange(tile, track);

   320

	}

   321

   322

	return cost + _price.build_rail;

   323

}

   324

   325

/** Remove a single piece of track

   326

 * @param tile tile to remove track from

   327

 * @param p1 unused

   328

 * @param p2 rail orientation

   329

 */

   330

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

   331

{

   332

	Track track = (Track)p2;

   333

	TrackBits trackbit;

   334

	int32 cost = _price.remove_rail;

   335

	bool crossing = false;

   336

   337

	if (!ValParamTrackOrientation(p2)) return CMD_ERROR;

   338

	trackbit = TrackToTrackBits(track);

   339

   340

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   341

   342

	switch (GetTileType(tile)) {

   343

		case MP_TUNNELBRIDGE:

   344

			if (!IsBridge(tile) ||

   345

					!IsBridgeMiddle(tile) ||

   346

					!IsTransportUnderBridge(tile) ||

   347

					GetTransportTypeUnderBridge(tile) != TRANSPORT_RAIL ||

   348

					GetRailBitsUnderBridge(tile) != trackbit ||

   349

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

   350

					!EnsureNoVehicleOnGround(tile)) {

   351

				return CMD_ERROR;

   352

			}

   353

   354

			if (flags & DC_EXEC) SetClearUnderBridge(tile);

   355

			break;

   356

   357

		case MP_STREET: {

   358

			if (!IsLevelCrossing(tile) ||

   359

					GetCrossingRailBits(tile) != trackbit ||

   360

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

   361

					!EnsureNoVehicle(tile)) {

   362

				return CMD_ERROR;

   363

			}

   364

   365

			if (flags & DC_EXEC) {

   366

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

   367

			}

   368

			break;

   369

		}

   370

   371

		case MP_RAILWAY: {

   372

			TrackBits present;

   373

   374

			if (!IsPlainRailTile(tile) ||

   375

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

   376

					!EnsureNoVehicle(tile)) {

   377

				return CMD_ERROR;

   378

			}

   379

   380

			present = GetTrackBits(tile);

   381

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

   382

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

   383

   384

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

   385

			if (HasSignalOnTrack(tile, track))

   386

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

   387

   388

			if (flags & DC_EXEC) {

   389

				present ^= trackbit;

   390

				if (present == 0) {

   391

					DoClearSquare(tile);

   392

				} else {

   393

					SetTrackBits(tile, present);

   394

				}

   395

			}

   396

			break;

   397

		}

   398

   399

		default: return CMD_ERROR;

   400

	}

   401

   402

	if (flags & DC_EXEC) {

   403

		MarkTileDirtyByTile(tile);

   404

		if (crossing) {

   405

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

   406

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

   407

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

   408

			 * 'connect' with the other piece. */

   409

			SetSignalsOnBothDir(tile, TRACK_X);

   410

			SetSignalsOnBothDir(tile, TRACK_Y);

   411

			YapfNotifyTrackLayoutChange(tile, TRACK_X);

   412

			YapfNotifyTrackLayoutChange(tile, TRACK_Y);

   413

		} else {

   414

			SetSignalsOnBothDir(tile, track);

   415

			YapfNotifyTrackLayoutChange(tile, track);

   416

		}

   417

	}

   418

   419

	return cost;

   420

}

   421

   422

   423

static const TileIndexDiffC _trackdelta[] = {

   424

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

   425

	{  0,  0 },

   426

	{  0,  0 },

   427

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

   428

	{  0,  0 },

   429

	{  0,  0 }

   430

};

   431

   432

   433

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

   434

{

   435

	int x = TileX(start);

   436

	int y = TileY(start);

   437

	int ex = TileX(end);

   438

	int ey = TileY(end);

   439

	int dx, dy, trdx, trdy;

   440

   441

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

   442

   443

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

   444

	dx = ex - x;

   445

	dy = ey - y;

   446

   447

	// calculate delta x,y for the first direction

   448

	trdx = _trackdelta[*trackdir].x;

   449

	trdy = _trackdelta[*trackdir].y;

   450

   451

	if (!IsDiagonalTrackdir(*trackdir)) {

   452

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

   453

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

   454

	}

   455

   456

	// validate the direction

   457

	while (

   458

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

   459

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

   460

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

   461

		(trdy >= 0 && dy < 0)

   462

	) {

   463

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

   464

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

   465

			trdx = -trdx;

   466

			trdy = -trdy;

   467

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

   468

			return CMD_ERROR;

   469

		}

   470

	}

   471

   472

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

   473

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

   474

	if (!IsDiagonalTrackdir(*trackdir)) {

   475

		trdx = _trackdelta[*trackdir].x;

   476

		trdy = _trackdelta[*trackdir].y;

   477

		if (abs(dx) != abs(dy) && abs(dx) + abs(trdy) != abs(dy) + abs(trdx))

   478

			return CMD_ERROR;

   479

	}

   480

   481

	return 0;

   482

}

   483

   484

/** Build a stretch of railroad tracks.

   485

 * @param tile start tile of drag

   486

 * @param p1 end tile of drag

   487

 * @param p2 various bitstuffed elements