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/* $Id$ */

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#include "stdafx.h"

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#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

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};

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    41

void ShowTrainDepotWindow(TileIndex tile);

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    43

/*         4

    44

 *     ---------

    45

 *    |\       /|

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 *    | \    1/ |

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 *    |  \   /  |

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 *    |   \ /   |

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 *  16|    \    |32

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 *    |   / \2  |

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 *    |  /   \  |

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 *    | /     \ |

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 *    |/       \|

    54

 *     ---------

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 *         8

    56

 */

    57

    58

    59

    60

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

    61

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

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

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

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 *				 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

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 */

    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);

    85

	future = current | to_build;

    86

    87

	/* Are we really building something new? */

    88

	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] = {

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   108

// set of normal ones

   109

{

   110

	TRACK_BIT_ALL,

   111

	TRACK_BIT_RIGHT,

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	TRACK_BIT_UPPER,

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	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,

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   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,

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	TRACK_BIT_ALL,

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	TRACK_BIT_ALL

   150

}

   151

};

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   153

uint GetRailFoundation(Slope tileh, TrackBits bits)

   154

{

   155

	uint i;

   156

   161

   162

	switch (bits) {

   163

		case TRACK_BIT_X: i = 0; break;

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		case TRACK_BIT_Y: i = 1; break;

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		default:          return 0;

   166

	}

   167

	switch (tileh) {

   177

	}

   178

	return i + 15;

   179

}

   180

   181

   182

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

   183

{

   190

		rail_bits |= existing;

   191

   192

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

   193

		if (IsTileType(tile, MP_WATER) &&

   194

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

   195

			return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   196

		}

   197

   198

		// no special foundation

   199

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

   200

			return 0;

   201

   202

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

   203

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

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

   205

				)) { // partly up

   206

			if (existing != 0) {

   207

				return 0;

   208

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

   209

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   210

			} else {

   211

				return _price.terraform;

   212

			}

   213

		}

   214

	}

   215

	return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

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}

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   218

/* Validate functions for rail building */

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

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   221

/** 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

   225

 */

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

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{

   228

	Slope tileh;

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	Track track = (Track)p2;

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	TrackBits trackbit;

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	int32 cost = 0;

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	int32 ret;

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   234

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

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   236

	tileh = GetTileSlope(tile, NULL);

   237

	trackbit = TrackToTrackBits(track);

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   239

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   240

   241

	switch (GetTileType(tile)) {

   242

		case MP_TUNNELBRIDGE:

   243

			if (!IsBridge(tile) ||

   244

					!IsBridgeMiddle(tile) ||

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

   246

				// Get detailed error message

   247

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

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			}

   249

   250

			if (IsClearUnderBridge(tile)) {

   251

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

   252

				if (CmdFailed(ret)) return ret;

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				cost += ret;

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   255

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

   256

			} else if (IsTransportUnderBridge(tile) &&

   257

					GetTransportTypeUnderBridge(tile) == TRANSPORT_RAIL) {

   258

				return_cmd_error(STR_1007_ALREADY_BUILT);

   259

			} else {

   260

				// Get detailed error message

   261

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

   262

			}

   263

			break;

   264

   265

		case MP_RAILWAY:

   266

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

   267

					!EnsureNoVehicle(tile)) {

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				return CMD_ERROR;

   269

			}

   270

			if (!IsTileOwner(tile, _current_player) ||

   271

					GetRailType(tile) != p1) {

   272

				// Get detailed error message

   273

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

   274

			}

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   276

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

   277

			if (CmdFailed(ret)) return ret;

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			cost += ret;

   279

   280

			if (flags & DC_EXEC) {

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				SetRailGroundType(tile, RAIL_GROUND_BARREN);

   282

				_m[tile].m5 |= trackbit;

   283

			}

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			break;

   285

   286

		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 */

   289

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

   290

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

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			}

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#undef M

   293

   294

			if (!EnsureNoVehicle(tile)) return CMD_ERROR;

   295

   296

			if (GetRoadTileType(tile) == ROAD_TILE_NORMAL) {

   297

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

   298

   299

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

   300

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

   301

					if (flags & DC_EXEC) {

   302

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

   303

					}

   304

					break;

   305

				}

   306

			}

   307

   308

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

   309

				return_cmd_error(STR_1007_ALREADY_BUILT);

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			}

   311

			/* FALLTHROUGH */

   312

   313

		default:

   314

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

   315

			if (CmdFailed(ret)) return ret;

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			cost += ret;

   317

   318

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

   319

			if (CmdFailed(ret)) return ret;

   320

			cost += ret;

   321

   322

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

   323

			break;

   324

	}

   325

   326

	if (flags & DC_EXEC) {

   327

		MarkTileDirtyByTile(tile);

   328

		SetSignalsOnBothDir(tile, track);

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		YapfNotifyTrackLayoutChange(tile, track);

   330

	}

   331

   332

	return cost + _price.build_rail;

   333

}

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   335

/** Remove a single piece of track

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 * @param tile tile to remove track from

   337

 * @param p1 unused

   338

 * @param p2 rail orientation

   339

 */

   340

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

   341

{

   342

	Track track = (Track)p2;

   343

	TrackBits trackbit;

   344

	int32 cost = _price.remove_rail;

   345

	bool crossing = false;

   346

   347

	if (!ValParamTrackOrientation(p2)) return CMD_ERROR;

   348

	trackbit = TrackToTrackBits(track);

   349

   350

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   351

   352

	switch (GetTileType(tile)) {

   353

		case MP_TUNNELBRIDGE:

   354

			if (!IsBridge(tile) ||

   355

					!IsBridgeMiddle(tile) ||

   356

					!IsTransportUnderBridge(tile) ||

   357

					GetTransportTypeUnderBridge(tile) != TRANSPORT_RAIL ||

   358

					GetRailBitsUnderBridge(tile) != trackbit ||

   359

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

   360

					!EnsureNoVehicleOnGround(tile)) {

   361

				return CMD_ERROR;

   362

			}

   363

   364

			if (flags & DC_EXEC) SetClearUnderBridge(tile);

   365

			break;

   366

   367

		case MP_STREET: {

   368

			if (!IsLevelCrossing(tile) ||

   369

					GetCrossingRailBits(tile) != trackbit ||

   370

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

   371

					!EnsureNoVehicle(tile)) {

   372

				return CMD_ERROR;

   373

			}

   374

   375

			if (flags & DC_EXEC) {

   376

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

   377

			}

   378

			break;

   379

		}

   380

   381

		case MP_RAILWAY: {

   382

			TrackBits present;

   383

   384

			if (!IsPlainRailTile(tile) ||

   385

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

   386

					!EnsureNoVehicle(tile)) {

   387

				return CMD_ERROR;

   388

			}

   389

   390

			present = GetTrackBits(tile);

   391

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

   392

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

   393

   394

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

   395

			if (HasSignalOnTrack(tile, track))

   396

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

   397

   398

			if (flags & DC_EXEC) {

   399

				present ^= trackbit;

   400

				if (present == 0) {

   401

					DoClearSquare(tile);

   402

				} else {

   403

					SetTrackBits(tile, present);

   404

				}

   405

			}

   406

			break;

   407

		}

   408

   409

		default: return CMD_ERROR;

   410

	}

   411

   412

	if (flags & DC_EXEC) {

   413

		MarkTileDirtyByTile(tile);

   414

		if (crossing) {

   415

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

   416

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

   417

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

   418

			 * 'connect' with the other piece. */

   419

			SetSignalsOnBothDir(tile, TRACK_X);

   420

			SetSignalsOnBothDir(tile, TRACK_Y);

   421

			YapfNotifyTrackLayoutChange(tile, TRACK_X);

   422

			YapfNotifyTrackLayoutChange(tile, TRACK_Y);

   423

		} else {

   424

			SetSignalsOnBothDir(tile, track);

   425

			YapfNotifyTrackLayoutChange(tile, track);

   426

		}

   427

	}

   428

   429

	return cost;

   430

}

   431

   432

   433

static const TileIndexDiffC _trackdelta[] = {

   434

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

   435

	{  0,  0 },

   436

	{  0,  0 },

   437

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

   438

	{  0,  0 },

   439

	{  0,  0 }

   440

};

   441

   442

   443

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

   444

{

   445

	int x = TileX(start);

   446

	int y = TileY(start);

   447

	int ex = TileX(end);

   448

	int ey = TileY(end);

   449

	int dx, dy, trdx, trdy;

   450

   451

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

   452

   453

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

   454

	dx = ex - x;

   455

	dy = ey - y;

   456

   457

	// calculate delta x,y for the first direction

   458

	trdx = _trackdelta[*trackdir].x;

   459

	trdy = _trackdelta[*trackdir].y;

   460

   461

	if (!IsDiagonalTrackdir(*trackdir)) {

   462

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

   463

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

   464

	}

   465

   466

	// validate the direction

   467

	while (

   468

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

   469

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

   470

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

   471

		(trdy >= 0 && dy < 0)

   472

	) {

   473

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

   474

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

   475

			trdx = -trdx;

   476

			trdy = -trdy;

   477

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

   478

			return CMD_ERROR;

   479

		}

   480

	}

   481

   482

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

   483

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

   484

	if (!IsDiagonalTrackdir(*trackdir)) {

   485

		trdx = _trackdelta[*trackdir].x;

   486

		trdy = _trackdelta[*trackdir].y;

   487

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