1

/* $Id$ */

     2

     3

#include "stdafx.h"

     4

#include "openttd.h"

     5

#include "rail_map.h"

     6

#include "road.h"

     7

#include "table/sprites.h"

     8

#include "table/strings.h"

     9

#include "functions.h"

    10

#include "map.h"

    11

#include "tile.h"

    12

#include "vehicle.h"

    13

#include "viewport.h"

    14

#include "command.h"

    15

#include "player.h"

    16

#include "town.h"

    17

#include "gfx.h"

    18

#include "sound.h"

    19

#include "depot.h"

    20

    21

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

    22

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

    23

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

    24

 * solution just like that... */

    25

static bool _road_special_gettrackstatus;

    26

    27

void RoadVehEnterDepot(Vehicle *v);

    28

    29

    30

static bool HasTileRoadAt(TileIndex tile, int i)

    31

{

    32

	RoadBits b;

    33

    34

	switch (GetTileType(tile)) {

    35

		case MP_STREET:

    36

			switch (GetRoadType(tile)) {

    37

				case ROAD_NORMAL:   b = GetRoadBits(tile); break;

    38

				case ROAD_CROSSING: b = GetCrossingRoadBits(tile); break;

    39

				case ROAD_DEPOT:    return (~_m[tile].m5 & 3) == i;

    40

				default:            return false;

    41

			}

    42

			break;

    43

    44

		case MP_STATION:

    45

			return

    46

				IS_BYTE_INSIDE(_m[tile].m5, 0x43, 0x43 + 8) &&

    47

				(~(_m[tile].m5 - 0x43) & 3) == i;

    48

    49

		case MP_TUNNELBRIDGE:

    50

			// bail out, if not a bridge middle part with road underneath

    51

			if ((_m[tile].m5 & 0xF8) != 0xE8) return false;

    52

			// road direction perpendicular to bridge

    53

			b = (_m[tile].m5 & 0x01) ? ROAD_X : ROAD_Y;

    54

    55

		default:

    56

			return false;

    57

	}

    58

    59

	return HASBIT(b, i);

    60

}

    61

    62

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

    63

{

    64

	int blocks;

    65

	byte owner;

    66

	uint n;

    67

	*edge_road = true;

    68

    69

	if (_game_mode == GM_EDITOR) return true;

    70

    71

	blocks = GetRoadBitsByTile(tile);

    72

	if (blocks == 0) return true;

    73

    74

	// Only do the special processing for actual players.

    75

	if (_current_player >= MAX_PLAYERS) return true;

    76

    77

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

    78

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

    79

		owner = _m[tile].m3;

    80

	} else {

    81

		owner = GetTileOwner(tile);

    82

	}

    83

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

    84

	// by a town

    85

	if (owner != OWNER_TOWN) {

    86

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

    87

	}

    88

    89

	if (_cheats.magic_bulldozer.value) return true;

    90

    91

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

    92

	n = 0;

    93

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

    94

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

    95

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

    96

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

    97

    98

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

    99

	// then allow it

   100

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

   101

		Town *t;

   102

		*edge_road = false;

   103

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

   104

		if (_patches.extra_dynamite) return true;

   105

   106

		t = ClosestTownFromTile(tile, _patches.dist_local_authority);

   107

   108

		SetDParam(0, t->index);

   109

		_error_message = STR_2009_LOCAL_AUTHORITY_REFUSES;

   110

		return false;

   111

	}

   112

   113

	return true;

   114

}

   115

   116

uint GetRoadBitsByTile(TileIndex tile)

   117

{

   118

	uint32 r = GetTileTrackStatus(tile, TRANSPORT_ROAD);

   119

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

   120

}

   121

   122

/** Delete a piece of road.

   123

 * @param x,y tile coordinates for road construction

   124

 * @param p1 road piece flags

   125

 * @param p2 unused

   126

 */

   127

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

   128

{

   129

	// cost for removing inner/edge -roads

   130

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

   131

   132

	TileInfo ti;

   133

	int32 cost;

   134

	TileIndex tile;

   135

	PlayerID owner;

   136

	Town *t;

   137

	/* true if the roadpiece was always removeable,

   138

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

   139

	bool edge_road;

   140

	RoadBits pieces;

   141

   142

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   143

   144

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

   145

	if (p1 >> 4) return CMD_ERROR;

   146

	pieces = p1;

   147

   148

	FindLandscapeHeight(&ti, x, y);

   149

	tile = ti.tile;

   150

   151

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

   152

   153

	// owner for railroad crossing is stored somewhere else

   154

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

   155

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

   156

   157

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

   158

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

   159

			t = ClosestTownFromTile(tile, _patches.dist_local_authority);

   160

		} else {

   161

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

   162

		}

   163

	} else {

   164

		t = NULL;

   165

	}

   166

   167

	// allow deleting road under bridge

   168

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

   169

   170

	{

   171

		bool b;

   172

		_road_special_gettrackstatus = true;

   173

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

   174

		_road_special_gettrackstatus = false;

   175

		if (!b) return CMD_ERROR;

   176

	}

   177

   178

	switch (ti.type) {

   179

		case MP_TUNNELBRIDGE:

   180

			if (!EnsureNoVehicleZ(tile, TilePixelHeight(tile))) return CMD_ERROR;

   181

   182

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

   183

				if (pieces & ROAD_X) goto return_error;

   184

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

   185

				if (pieces & ROAD_Y) goto return_error;

   186

			} else {

   187

				goto return_error;

   188

			}

   189

   190

			cost = _price.remove_road * 2;

   191

   192

			if (flags & DC_EXEC) {

   193

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

   194

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

   195

				SetTileOwner(tile, OWNER_NONE);

   196

				MarkTileDirtyByTile(tile);

   197

			}

   198

			return cost;

   199

   200

		case MP_STREET:

   201

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

   202

			// removal allowance depends on difficulty setting

   203

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

   204

   205

			switch (GetRoadType(ti.tile)) {

   206

				case ROAD_NORMAL: {

   207

					byte c = pieces, t2;

   208

   209

					if (ti.tileh != 0  && (ti.map5 == ROAD_Y || ti.map5 == ROAD_X)) {

   210

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

   211

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

   212

					}

   213

   214

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

   215

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

   216

   217

					// calculate the cost

   218

					t2 = c;

   219

					cost = 0;

   220

					do {

   221

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

   222

					} while (t2 >>= 1);

   223

   224

					if (flags & DC_EXEC) {

   225

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

   226

   227

						_m[tile].m5 ^= c;

   228

						if (GetRoadBits(tile) == 0) {

   229

							DoClearSquare(tile);

   230

						} else {

   231

							MarkTileDirtyByTile(tile);

   232

						}

   233

					}

   234

					return cost;

   235

				}

   236

   237

				case ROAD_CROSSING: {

   238

					if (pieces & ComplementRoadBits(GetCrossingRoadBits(tile))) {

   239

						goto return_error;

   240

					}

   241

   242

					cost = _price.remove_road * 2;

   243

					if (flags & DC_EXEC) {

   244

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

   245

   246

						MakeRailNormal(tile, GetTileOwner(tile), GetCrossingRailBits(tile), GB(_m[tile].m4, 0, 4));

   247

						MarkTileDirtyByTile(tile);

   248

					}

   249

					return cost;

   250

				}

   251

   252

				default:

   253

				case ROAD_DEPOT:

   254

					goto return_error;

   255

			}

   256

   257

		default:

   258

return_error:;

   259

			return_cmd_error(INVALID_STRING_ID);

   260

	}

   261

}

   262

   263

   264

static const RoadBits _valid_tileh_slopes_road[][15] = {

   265

	// set of normal ones

   266

	{

   267

		ROAD_ALL, 0, 0,

   268

		ROAD_X,   0, 0,  // 3, 4, 5

   269

		ROAD_Y,   0, 0,

   270

		ROAD_Y,   0, 0,  // 9, 10, 11

   271

		ROAD_X,   0, 0

   272

	},

   273

	// allowed road for an evenly raised platform

   274

	{

   275

		0,

   276

		ROAD_SW | ROAD_NW,

   277

		ROAD_SW | ROAD_SE,

   278

		ROAD_Y  | ROAD_SW,

   279

   280

		ROAD_SE | ROAD_NE, // 4

   281

		ROAD_ALL,

   282

		ROAD_X  | ROAD_SE,

   283

		ROAD_ALL,

   284

   285

		ROAD_NW | ROAD_NE, // 8

   286

		ROAD_X  | ROAD_NW,

   287

		ROAD_ALL,

   288

		ROAD_ALL,

   289

   290

		ROAD_Y  | ROAD_NE, // 12

   291

		ROAD_ALL,

   292

		ROAD_ALL

   293

	},

   294

};

   295

   296

   297

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

   298

{

   299

	if (!IsSteepTileh(tileh)) {

   300

		byte road_bits = *pieces | existing;

   301

   302

		// no special foundation

   303

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

   304

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

   305

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

   306

			return 0; // no extra cost

   307

		}

   308

   309

		// foundation is used. Whole tile is leveled up

   310

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

   311

			return existing ? 0 : _price.terraform;

   312

		}

   313

   314

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

   315

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

   316

			// force full pieces.

   317

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

   318

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

   319

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

   320

		}

   321

	}

   322

	return CMD_ERROR;

   323

}

   324

   325

/** Build a piece of road.

   326

 * @param x,y tile coordinates for road construction

   327

 * @param p1 road piece flags

   328

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

   329

 */

   330

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

   331

{

   332

	TileInfo ti;

   333

	int32 cost;

   334

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

   335

	TileIndex tile;

   336

   337

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   338

   339

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

   340

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

   341

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

   342

   343

	FindLandscapeHeight(&ti, x, y);

   344

	tile = ti.tile;

   345

   346

	// allow building road under bridge

   347

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

   348

   349

	switch (ti.type) {

   350

		case MP_STREET:

   351

			switch (GetRoadType(ti.tile)) {

   352

				case ROAD_NORMAL:

   353

					if ((GetRoadBits(ti.tile) & pieces) == pieces) {

   354

						return_cmd_error(STR_1007_ALREADY_BUILT);

   355

					}

   356

					existing = ti.map5;

   357

					break;

   358

   359

				case ROAD_CROSSING:

   360

					if (pieces != GetCrossingRoadBits(ti.tile)) { // XXX is this correct?

   361

						return_cmd_error(STR_1007_ALREADY_BUILT);

   362

					}

   363

					goto do_clear;

   364

   365

				default:

   366

				case ROAD_DEPOT:

   367

					goto do_clear;

   368

			}

   369

			break;

   370

   371

		case MP_RAILWAY: {

   372

			Axis roaddir;

   373

   374

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

   375

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   376

			}

   377

   378

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

   379

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

   380

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

   381

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   382

			}

   383

#undef M

   384

   385

			if (ti.map5 == 2) {

   386

				if (pieces & ROAD_Y) goto do_clear;

   387

				roaddir = AXIS_X;

   388

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

   389

				if (pieces & ROAD_X) goto do_clear;

   390

				roaddir = AXIS_Y;

   391

			} else {

   392

				goto do_clear;

   393

			}

   394

   395

			if (flags & DC_EXEC) {

   396

				MakeRoadCrossing(tile, _current_player, GetTileOwner(tile), roaddir, GB(_m[tile].m3, 0, 4), p2);

   397

				MarkTileDirtyByTile(tile);

   398

			}

   399

			return _price.build_road * 2;

   400

		}

   401

   402

		case MP_TUNNELBRIDGE:

   403

			/* check for flat land */

   404

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

   405

				return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   406

			}

   407

   408

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

   409

			if ((ti.map5 & 0xC0) != 0xC0) goto do_clear;

   410

   411

			/* only allow roads pertendicular to bridge */

   412

			if (((pieces & 5U) != 0) == ((ti.map5 & 0x01U) != 0)) goto do_clear;

   413

   414

			/* check if clear land under bridge */

   415

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

   416

				return_cmd_error(STR_1007_ALREADY_BUILT);

   417

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

   418

				return_cmd_error(STR_1008_MUST_REMOVE_RAILROAD_TRACK);

   419

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

   420

				return_cmd_error(STR_3807_CAN_T_BUILD_ON_WATER);

   421

			}

   422

   423

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

   424

			cost = _price.build_road * 2;

   425

			if (flags & DC_EXEC) {

   426

				ModifyTile(tile,

   427

					MP_MAPOWNER_CURRENT | MP_MAP5,

   428

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

   429

				);

   430

			}

   431

			return cost;

   432

   433

		default:

   434

do_clear:;

   435

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

   436

				return CMD_ERROR;

   437

	}

   438

   439

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

   440

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

   441

   442

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

   443

		return CMD_ERROR;

   444

   445

	if (ti.type != MP_STREET || GetRoadType(ti.tile) != ROAD_NORMAL) {

   446

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

   447

	} else {

   448

		// Don't put the pieces that already exist

   449

		pieces &= ~ti.map5;

   450

	}

   451

   452

	{

   453

		byte t = pieces;

   454

		while (t) {

   455

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

   456

			t >>= 1;

   457

		}

   458

	}

   459

   460

	if (flags & DC_EXEC) {

   461

		if (ti.type != MP_STREET) {

   462

			MakeRoadNormal(tile, _current_player, pieces, p2);

   463

		} else {

   464

			_m[tile].m5 |= pieces;

   465

		}

   466

   467

		MarkTileDirtyByTile(tile);

   468

	}

   469

	return cost;

   470

}

   471

   472

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

   473

{

   474

	// not a railroad crossing?

   475

	if (!IsLevelCrossing(tile)) return CMD_ERROR;

   476

   477

	// not owned by me?

   478

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

   479

   480

	// tile is already of requested type?

   481

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

   482

   483

	if (exec) {

   484

		// change type.

   485

		SB(_m[tile].m4, 0, 4, totype);

   486

		MarkTileDirtyByTile(tile);

   487

	}

   488

   489

	return _price.build_rail >> 1;

   490

}

   491

   492

   493

/** Build a long piece of road.

   494

 * @param x,y end tile of drag

   495

 * @param p1 start tile of drag

   496

 * @param p2 various bitstuffed elements