1

/* $Id$ */

     2

     3

#include "stdafx.h"

     4

#include "openttd.h"

     5

#include "table/sprites.h"

     6

#include "table/strings.h"

     7

#include "functions.h"

     8

#include "map.h"

     9

#include "tile.h"

    10

#include "vehicle.h"

    11

#include "viewport.h"

    12

#include "command.h"

    13

#include "player.h"

    14

#include "town.h"

    15

#include "gfx.h"

    16

#include "sound.h"

    17

#include "depot.h"

    18

#include "pbs.h"

    19

#include "debug.h"

    20

#include "ai/ai_event.h"

    21

    22

/* When true, GetTrackStatus for roads will treat roads under reconstruction

    23

 * as normal roads instead of impassable. This is used when detecting whether

    24

 * a road can be removed. This is of course ugly, but I don't know a better

    25

 * solution just like that... */

    26

static bool _road_special_gettrackstatus;

    27

    28

void RoadVehEnterDepot(Vehicle *v);

    29

    30

    31

static bool HasTileRoadAt(TileIndex tile, int i)

    32

{

    33

	int mask;

    34

	byte b;

    35

    36

	switch (GetTileType(tile)) {

    37

	case MP_STREET:

    38

		b = _m[tile].m5;

    39

    40

		if ((b & 0xF0) == 0) {

    41

		} else if (IsLevelCrossing(tile)) {

    42

			b = (b&8)?5:10;

    43

		} else if ((b & 0xF0) == 0x20) {

    44

			return (~b & 3) == i;

    45

		} else

    46

			return false;

    47

		break;

    48

    49

	case MP_STATION:

    50

		b = _m[tile].m5;

    51

		if (!IS_BYTE_INSIDE(b, 0x43, 0x43+8))

    52

			return false;

    53

		return ((~(b - 0x43) & 3) == i);

    54

    55

	case MP_TUNNELBRIDGE:

    56

		mask = GetRoadBitsByTile(tile);

    57

		b = 10; if (mask & 1) break;

    58

		b = 5;  if (mask & 2) break;

    59

		return false;

    60

    61

	default:

    62

		return false;

    63

	}

    64

    65

	return HASBIT(b, i);

    66

}

    67

    68

static bool CheckAllowRemoveRoad(TileIndex tile, uint br, bool *edge_road)

    69

{

    70

	int blocks;

    71

	byte owner;

    72

	uint n;

    73

	*edge_road = true;

    74

    75

	if (_game_mode == GM_EDITOR)

    76

		return true;

    77

    78

	blocks = GetRoadBitsByTile(tile);

    79

	if (blocks == 0)

    80

		return true;

    81

    82

	// Only do the special processing for actual players.

    83

	if (_current_player >= MAX_PLAYERS)

    84

		return true;

    85

    86

	// A railway crossing has the road owner in the map3_lo byte.

    87

	if (IsTileType(tile, MP_STREET) && IsLevelCrossing(tile)) {

    88

		owner = _m[tile].m3;

    89

	} else {

    90

		owner = GetTileOwner(tile);

    91

	}

    92

	// Only do the special processing if the road is owned

    93

	// by a town

    94

	if (owner != OWNER_TOWN) {

    95

		return owner == OWNER_NONE || CheckOwnership(owner);

    96

	}

    97

    98

	if (_cheats.magic_bulldozer.value)

    99

		return true;

   100

   101

	// Get a bitmask of which neighbouring roads has a tile

   102

	n = 0;

   103

	if (blocks&0x25 && HasTileRoadAt(TILE_ADDXY(tile,-1, 0), 1)) n |= 8;

   104

	if (blocks&0x2A && HasTileRoadAt(TILE_ADDXY(tile, 0, 1), 0)) n |= 4;

   105

	if (blocks&0x19 && HasTileRoadAt(TILE_ADDXY(tile, 1, 0), 3)) n |= 2;

   106

	if (blocks&0x16 && HasTileRoadAt(TILE_ADDXY(tile, 0,-1), 2)) n |= 1;

   107

   108

	// If 0 or 1 bits are set in n, or if no bits that match the bits to remove,

   109

	// then allow it

   110

	if ((n & (n-1)) != 0 && (n & br) != 0) {

   111

		Town *t;

   112

		*edge_road = false;

   113

		// you can remove all kind of roads with extra dynamite

   114

		if (_patches.extra_dynamite)

   115

			return true;

   116

   117

		t = ClosestTownFromTile(tile, _patches.dist_local_authority);

   118

   119

		SetDParam(0, t->index);

   120

		_error_message = STR_2009_LOCAL_AUTHORITY_REFUSES;

   121

		return false;

   122

	}

   123

   124

	return true;

   125

}

   126

   127

uint GetRoadBitsByTile(TileIndex tile)

   128

{

   129

	uint32 r = GetTileTrackStatus(tile, TRANSPORT_ROAD);

   130

	return (byte)(r | (r >> 8));

   131

}

   132

   133

/** Delete a piece of road.

   134

 * @param x,y tile coordinates for road construction

   135

 * @param p1 road piece flags

   136

 * @param p2 unused

   137

 */

   138

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

   139

{

   140

	// cost for removing inner/edge -roads

   141

	static const uint16 road_remove_cost[2] = {50, 18};

   142

   143

	TileInfo ti;

   144

	int32 cost;

   145

	TileIndex tile;

   146

	PlayerID owner;

   147

	Town *t;

   148

	/* true if the roadpiece was always removeable,

   149

	 * false if it was a center piece. Affects town ratings drop */

   150

	bool edge_road;

   151

	byte pieces = (byte)p1;

   152

   153

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   154

   155

	/* Road pieces are max 4 bitset values (NE, NW, SE, SW) */

   156

	if (pieces >> 4) return CMD_ERROR;

   157

   158

	FindLandscapeHeight(&ti, x, y);

   159

	tile = ti.tile;

   160

   161

	if (!IsTileType(tile, MP_STREET) && !IsTileType(tile, MP_TUNNELBRIDGE)) return CMD_ERROR;

   162

   163

	// owner for railroad crossing is stored somewhere else

   164

	// XXX - Fix this so for a given tiletype the owner of the type is in the same variable

   165

	owner = IsLevelCrossing(tile) ? _m[tile].m3 : GetTileOwner(tile);

   166

   167

	if (owner == OWNER_TOWN && _game_mode != GM_EDITOR) {

   168

		if (IsTileType(tile, MP_TUNNELBRIDGE)) { // index of town is not saved for bridge (no space)

   169

			t = ClosestTownFromTile(tile, _patches.dist_local_authority);

   170

		} else

   171

			t = GetTown(_m[tile].m2);

   172

	} else

   173

		t = NULL;

   174

   175

	// allow deleting road under bridge

   176

	if (ti.type != MP_TUNNELBRIDGE && !EnsureNoVehicle(tile))

   177

		return CMD_ERROR;

   178

   179

	{

   180

		bool b;

   181

		_road_special_gettrackstatus = true;

   182

		b = CheckAllowRemoveRoad(tile, pieces, &edge_road);

   183

		_road_special_gettrackstatus = false;

   184

		if (!b) return CMD_ERROR;

   185

	}

   186

   187

	if (ti.type == MP_TUNNELBRIDGE) {

   188

		if (!EnsureNoVehicleZ(tile, TilePixelHeight(tile)))

   189

			return CMD_ERROR;

   190

   191

		if ((ti.map5 & 0xE9) == 0xE8) {

   192

			if (pieces & 10) goto return_error;

   193

		} else if ((ti.map5 & 0xE9) == 0xE9) {

   194

			if (pieces & 5) goto return_error;

   195

		} else

   196

			goto return_error;

   197

   198

		cost = _price.remove_road * 2;

   199

   200

		if (flags & DC_EXEC) {

   201

			ChangeTownRating(t, -road_remove_cost[(byte)edge_road], RATING_ROAD_MINIMUM);

   202

			_m[tile].m5 = ti.map5 & 0xC7;

   203

			SetTileOwner(tile, OWNER_NONE);

   204

			MarkTileDirtyByTile(tile);

   205

		}

   206

		return cost;

   207

	} else if (ti.type == MP_STREET) {

   208

		// check if you're allowed to remove the street owned by a town

   209

		// removal allowance depends on difficulty setting

   210

		if (!CheckforTownRating(tile, flags, t, ROAD_REMOVE)) return CMD_ERROR;

   211

   212

		// XXX - change cascading ifs to switch when doing rewrite

   213

		if ((ti.map5 & 0xF0) == 0) { // normal road

   214

			byte c = pieces, t2;

   215

   216

			if (ti.tileh != 0  && (ti.map5 == 5 || ti.map5 == 10)) {

   217

				c |= (c & 0xC) >> 2;

   218

				c |= (c & 0x3) << 2;

   219

			}

   220

   221

			// limit the bits to delete to the existing bits.

   222

			if ((c &= ti.map5) == 0) goto return_error;

   223

   224

			// calculate the cost

   225

			t2 = c;

   226

			cost = 0;

   227

			do {

   228

				if (t2&1) cost += _price.remove_road;

   229

			} while(t2>>=1);

   230

   231

			if (flags & DC_EXEC) {

   232

				ChangeTownRating(t, -road_remove_cost[(byte)edge_road], RATING_ROAD_MINIMUM);

   233

   234

				_m[tile].m5 ^= c;

   235

				if (GB(_m[tile].m5, 0, 4) == 0) {

   236

					DoClearSquare(tile);

   237

				} else {

   238

					MarkTileDirtyByTile(tile);

   239

				}

   240

			}

   241

			return cost;

   242

		} else if ((ti.map5 & 0xE0) == 0) { // railroad crossing

   243

			byte c;

   244

   245

			if (!(ti.map5 & 8)) {

   246

				c = 2;

   247

				if (pieces & 5) goto return_error;

   248

			} else {

   249

				c = 1;

   250

				if (pieces & 10) goto return_error;

   251

			}

   252

   253

			cost = _price.remove_road * 2;

   254

			if (flags & DC_EXEC) {

   255

				byte pbs_track = PBSTileReserved(tile);

   256

				ChangeTownRating(t, -road_remove_cost[(byte)edge_road], RATING_ROAD_MINIMUM);

   257

   258

				ModifyTile(tile,

   259

					MP_SETTYPE(MP_RAILWAY) |

   260

					MP_MAP2_CLEAR | MP_MAP3LO | MP_MAP3HI_CLEAR | MP_MAP5,

   261

					_m[tile].m4 & 0xF, /* map3_lo */

   262

					c											/* map5 */

   263

				);

   264

				if (pbs_track != 0)

   265

					PBSReserveTrack(tile, FIND_FIRST_BIT(pbs_track));

   266

			}

   267

			return cost;

   268

		} else

   269

			goto return_error;

   270

   271

	} else {

   272

return_error:;

   273

		return_cmd_error(INVALID_STRING_ID);

   274

	}

   275

}

   276

   277

   278

enum {

   279

	ROAD_NW = 1, // NW road track

   280

	ROAD_SW = 2, // SW road track

   281

	ROAD_SE = 4, // SE road track

   282

	ROAD_NE = 8, // NE road track

   283

	ROAD_ALL = (ROAD_NW | ROAD_SW | ROAD_SE | ROAD_NE)

   284

};

   285

   286

static const byte _valid_tileh_slopes_road[3][15] = {

   287

	// set of normal ones

   288

	{

   289

		ROAD_ALL, 0, 0,

   290

		ROAD_SW | ROAD_NE, 0, 0,  // 3, 4, 5

   291

		ROAD_NW | ROAD_SE, 0, 0,

   292

		ROAD_NW | ROAD_SE, 0, 0,  // 9, 10, 11

   293

		ROAD_SW | ROAD_NE, 0, 0

   294

	},

   295

	// allowed road for an evenly raised platform

   296

	{

   297

		0,

   298

		ROAD_SW | ROAD_NW,

   299

		ROAD_SW | ROAD_SE,

   300

		ROAD_NW | ROAD_SE | ROAD_SW,

   301

   302

		ROAD_SE | ROAD_NE, // 4

   303

		ROAD_ALL,

   304

		ROAD_SW | ROAD_NE | ROAD_SE,

   305

		ROAD_ALL,

   306

   307

		ROAD_NW | ROAD_NE, // 8

   308

		ROAD_SW | ROAD_NE | ROAD_NW,

   309

		ROAD_ALL,

   310

		ROAD_ALL,

   311

   312

		ROAD_NW | ROAD_SE | ROAD_NE, // 12

   313

		ROAD_ALL,

   314

		ROAD_ALL

   315

	},

   316

	// valid railway crossings on slopes

   317

	{

   318

		1, 0, 0, // 0, 1, 2

   319

		0, 0, 1, // 3, 4, 5

   320

		0, 1, 0, // 6, 7, 8

   321

		0, 1, 1, // 9, 10, 11

   322

		0, 1, 1, // 12, 13, 14

   323

	}

   324

};

   325

   326

   327

static uint32 CheckRoadSlope(int tileh, byte *pieces, byte existing)

   328

{

   329

	if (!IsSteepTileh(tileh)) {

   330

		byte road_bits = *pieces | existing;

   331

   332

		// no special foundation

   333

		if ((~_valid_tileh_slopes_road[0][tileh] & road_bits) == 0) {

   334

			// force that all bits are set when we have slopes

   335

			if (tileh != 0) *pieces |= _valid_tileh_slopes_road[0][tileh];

   336

			return 0; // no extra cost

   337

		}

   338

   339

		// foundation is used. Whole tile is leveled up

   340

		if ((~_valid_tileh_slopes_road[1][tileh] & road_bits) == 0) {

   341

			return existing ? 0 : _price.terraform;

   342

		}

   343

   344

		// partly leveled up tile, only if there's no road on that tile

   345

		if ( !existing && (tileh == 1 || tileh == 2 || tileh == 4 || tileh == 8) ) {

   346

			// force full pieces.

   347

			*pieces |= (*pieces & 0xC) >> 2;

   348

			*pieces |= (*pieces & 0x3) << 2;

   349

			return (*pieces == (ROAD_NE|ROAD_SW) || *pieces == (ROAD_SE|ROAD_NW)) ? _price.terraform : CMD_ERROR;

   350

		}

   351

	}

   352

	return CMD_ERROR;

   353

}

   354

   355

/** Build a piece of road.

   356

 * @param x,y tile coordinates for road construction

   357

 * @param p1 road piece flags

   358

 * @param p2 the town that is building the road (0 if not applicable)

   359

 */

   360

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

   361

{

   362

	TileInfo ti;

   363

	int32 cost;

   364

	byte pieces = (byte)p1, existing = 0;

   365

	TileIndex tile;

   366

   367

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   368

   369

	/* Road pieces are max 4 bitset values (NE, NW, SE, SW) and town can only be non-zero

   370

	 * if a non-player is building the road */

   371

	if ((pieces >> 4) || (_current_player < MAX_PLAYERS && p2 != 0) || !IsTownIndex(p2)) return CMD_ERROR;

   372

   373

	FindLandscapeHeight(&ti, x, y);

   374

	tile = ti.tile;

   375

   376

	// allow building road under bridge

   377

	if (ti.type != MP_TUNNELBRIDGE && !EnsureNoVehicle(tile)) return CMD_ERROR;

   378

   379

	if (ti.type == MP_STREET) {

   380

		if (!(ti.map5 & 0xF0)) {

   381

			if ((pieces & (byte)ti.map5) == pieces)

   382

				return_cmd_error(STR_1007_ALREADY_BUILT);

   383

			existing = ti.map5;

   384

		} else {

   385

			if (!(ti.map5 & 0xE0) && pieces != ((ti.map5 & 8) ? 5 : 10))

   386

				return_cmd_error(STR_1007_ALREADY_BUILT);

   387

			goto do_clear;

   388

		}

   389

	} else if (ti.type == MP_RAILWAY) {

   390

		byte m5;

   391

   392

		if (IsSteepTileh(ti.tileh)) // very steep tile

   393

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   394

   395

		if(!_valid_tileh_slopes_road[2][ti.tileh]) // prevent certain slopes

   396

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   397

   398

		if (ti.map5 == 2) {

   399

			if (pieces & 5) goto do_clear;

   400

			m5 = 0x10;

   401

		} else if (ti.map5 == 1) {

   402

			if (pieces & 10) goto do_clear;

   403

			m5 = 0x18;

   404

		} else

   405

			goto do_clear;

   406

   407

		if (flags & DC_EXEC) {

   408

			byte pbs_track = PBSTileReserved(tile);

   409

			ModifyTile(tile,

   410

				MP_SETTYPE(MP_STREET) |

   411

				MP_MAP2 | MP_MAP3LO | MP_MAP3HI | MP_MAP5,

   412

				p2,

   413

				_current_player, /* map3_lo */

   414

				_m[tile].m3 & 0xF, /* map3_hi */

   415

				m5 /* map5 */

   416

			);

   417

			if (pbs_track != 0)

   418

				PBSReserveTrack(tile, FIND_FIRST_BIT(pbs_track));

   419

		}

   420

		return _price.build_road * 2;

   421

	} else if (ti.type == MP_TUNNELBRIDGE) {

   422

   423

		/* check for flat land */

   424

		if (IsSteepTileh(ti.tileh)) // very steep tile

   425

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   426

   427

		/* is this middle part of a bridge? */

   428

		if ((ti.map5 & 0xC0) != 0xC0)

   429

				goto do_clear;

   430

   431

		/* only allow roads pertendicular to bridge */

   432

		if ((pieces & 5U) == (ti.map5 & 0x01U))

   433

				goto do_clear;

   434

   435

		/* check if clear land under bridge */

   436

		if ((ti.map5 & 0xF8) == 0xE8) 			/* road under bridge */

   437

				return_cmd_error(STR_1007_ALREADY_BUILT);

   438

		else if ((ti.map5 & 0xE0) == 0xE0) 	/* other transport route under bridge */

   439

				return_cmd_error(STR_1008_MUST_REMOVE_RAILROAD_TRACK);

   440

		else if ((ti.map5 & 0xF8) == 0xC8) 	/* water under bridge */

   441

				return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   442

   443

		/* all checked, can build road now! */

   444

		cost = _price.build_road * 2;

   445

		if (flags & DC_EXEC) {

   446

			ModifyTile(tile,

   447

				MP_MAPOWNER_CURRENT | MP_MAP5,

   448

				(ti.map5 & 0xC7) | 0x28 // map5

   449

			);

   450

		}

   451

		return cost;

   452

	} else {

   453

do_clear:;

   454

		if (CmdFailed(DoCommandByTile(tile, 0, 0, flags & ~DC_EXEC, CMD_LANDSCAPE_CLEAR)))

   455

			return CMD_ERROR;

   456

	}

   457

   458

	cost = CheckRoadSlope(ti.tileh, &pieces, existing);

   459

	if (CmdFailed(cost)) return_cmd_error(STR_1800_LAND_SLOPED_IN_WRONG_DIRECTION);

   460

   461

	if (cost && (!_patches.build_on_slopes || _is_old_ai_player))

   462

		return CMD_ERROR;

   463

   464

	if (ti.type != MP_STREET || (ti.map5 & 0xF0) != 0) {

   465

		cost += DoCommandByTile(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);

   466

	} else {

   467

		// Don't put the pieces that already exist

   468

		pieces &= ~ti.map5;

   469

	}

   470

   471

	{

   472

		byte t = pieces;

   473

		while (t) {

   474

			if (t & 1) cost += _price.build_road;

   475

			t >>= 1;

   476

		}

   477

	}

   478

   479

	if (flags & DC_EXEC) {

   480

		if (ti.type != MP_STREET) {

   481

			SetTileType(tile, MP_STREET);

   482

			_m[tile].m5 = 0;

   483

			_m[tile].m2 = p2;

   484

			SetTileOwner(tile, _current_player);

   485

		}

   486

   487

		_m[tile].m5 |= pieces;

   488

   489

		MarkTileDirtyByTile(tile);

   490

   491

		ai_event(_current_player, ottd_Event_BuildRoad, tile, pieces);

   492

	}

   493

	return cost;

   494

}

   495

   496

int32 DoConvertStreetRail(TileIndex tile, uint totype, bool exec)

   497

{

   498

	// not a railroad crossing?

   499

	if (!IsLevelCrossing(tile)) return CMD_ERROR;

   500

   501

	// not owned by me?

   502

	if (!CheckTileOwnership(tile) || !EnsureNoVehicle(tile)) return CMD_ERROR;

   503

   504

	// tile is already of requested type?

   505

	if (GB(_m[tile].m4, 0, 4) == totype) return CMD_ERROR;

   506

   507

	if (exec) {