1

/* $Id$ */

     2

     3

/** @file tunnelbridge_cmd.cpp

     4

 * This file deals with tunnels and bridges (non-gui stuff)

     5

 * @todo seperate this file into two

     6

 */

     7

     8

#include "stdafx.h"

     9

#include "openttd.h"

    10

#include "bridge_map.h"

    11

#include "rail_map.h"

    12

#include "road_map.h"

    13

#include "tile_cmd.h"

    14

#include "landscape.h"

    15

#include "tunnel_map.h"

    16

#include "unmovable_map.h"

    17

#include "viewport_func.h"

    18

#include "command_func.h"

    19

#include "town.h"

    20

#include "variables.h"

    21

#include "bridge.h"

    22

#include "train.h"

    23

#include "water_map.h"

    24

#include "yapf/yapf.h"

    25

#include "newgrf_sound.h"

    26

#include "autoslope.h"

    27

#include "transparency.h"

    28

#include "tunnelbridge_map.h"

    29

#include "strings_func.h"

    30

#include "date_func.h"

    31

#include "functions.h"

    32

#include "vehicle_func.h"

    33

#include "sound_func.h"

    34

#include "signal_func.h"

    35

#include "tunnelbridge.h"

    36

#include "player_base.h"

    37

#include "engine_func.h"

    38

#include "engine_base.h"

    39

#include "economy_func.h"

    40

#include "rail.h"

    41

#include "cheat_func.h"

    42

#include "elrail_func.h"

    43

#include "landscape_type.h"

    44

    45

#include "table/sprites.h"

    46

#include "table/strings.h"

    47

#include "table/bridge_land.h"

    48

    49

BridgeSpec _bridge[MAX_BRIDGES];

    50

TileIndex _build_tunnel_endtile;

    51

    52

/** Reset the data been eventually changed by the grf loaded. */

    53

void ResetBridges()

    54

{

    55

	/* First, free sprite table data */

    56

	for (BridgeType i = 0; i < MAX_BRIDGES; i++) {

    57

		if (_bridge[i].sprite_table != NULL) {

    58

			for (uint j = 0; j < 7; j++) free(_bridge[i].sprite_table[j]);

    59

			free(_bridge[i].sprite_table);

    60

		}

    61

	}

    62

    63

	/* Then, wipe out current bidges */

    64

	memset(&_bridge, 0, sizeof(_bridge));

    65

	/* And finally, reinstall default data */

    66

	memcpy(&_bridge, &_orig_bridge, sizeof(_orig_bridge));

    67

}

    68

    69

/** calculate the price factor for building a long bridge.

    70

 * basically the cost delta is 1,1, 1, 2,2, 3,3,3, 4,4,4,4, 5,5,5,5,5, 6,6,6,6,6,6,  7,7,7,7,7,7,7,  8,8,8,8,8,8,8,8,

    71

 */

    72

int CalcBridgeLenCostFactor(int x)

    73

{

    74

	int n;

    75

	int r;

    76

    77

	if (x < 2) return x;

    78

	x -= 2;

    79

	for (n = 0, r = 2;; n++) {

    80

		if (x <= n) return r + x * n;

    81

		r += n * n;

    82

		x -= n;

    83

	}

    84

}

    85

    86

Foundation GetBridgeFoundation(Slope tileh, Axis axis)

    87

{

    88

	if ((tileh == SLOPE_FLAT) ||

    89

	    (((tileh == SLOPE_NE) || (tileh == SLOPE_SW)) && (axis == AXIS_X)) ||

    90

	    (((tileh == SLOPE_NW) || (tileh == SLOPE_SE)) && (axis == AXIS_Y))) return FOUNDATION_NONE;

    91

    92

	return (HasSlopeHighestCorner(tileh) ? InclinedFoundation(axis) : FlatteningFoundation(tileh));

    93

}

    94

    95

/**

    96

 * Determines if the track on a bridge ramp is flat or goes up/down.

    97

 *

    98

 * @param tileh Slope of the tile under the bridge head

    99

 * @param axis Orientation of bridge

   100

 * @return true iff the track is flat.

   101

 */

   102

bool HasBridgeFlatRamp(Slope tileh, Axis axis)

   103

{

   104

	ApplyFoundationToSlope(GetBridgeFoundation(tileh, axis), &tileh);

   105

	/* If the foundation slope is flat the bridge has a non-flat ramp and vice versa. */

   106

	return (tileh != SLOPE_FLAT);

   107

}

   108

   109

static inline const PalSpriteID *GetBridgeSpriteTable(int index, byte table)

   110

{

   111

	const BridgeSpec *bridge = GetBridgeSpec(index);

   112

	assert(table < 7);

   113

	if (bridge->sprite_table == NULL || bridge->sprite_table[table] == NULL) {

   114

		return _bridge_sprite_table[index][table];

   115

	} else {

   116

		return bridge->sprite_table[table];

   117

	}

   118

}

   119

   120

   121

/**

   122

 * Determines the foundation for the north bridge head, and tests if the resulting slope is valid.

   123

 *

   124

 * @param axis Axis of the bridge

   125

 * @param tileh Slope of the tile under the north bridge head; returns slope on top of foundation

   126

 * @param z TileZ corresponding to tileh, gets modified as well

   127

 * @return Error or cost for bridge foundation

   128

 */

   129

static CommandCost CheckBridgeSlopeNorth(Axis axis, Slope *tileh, uint *z)

   130

{

   131

	Foundation f = GetBridgeFoundation(*tileh, axis);

   132

	*z += ApplyFoundationToSlope(f, tileh);

   133

   134

	Slope valid_inclined = (axis == AXIS_X ? SLOPE_NE : SLOPE_NW);

   135

	if ((*tileh != SLOPE_FLAT) && (*tileh != valid_inclined)) return CMD_ERROR;

   136

   137

	if (f == FOUNDATION_NONE) return CommandCost();

   138

   139

	return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);

   140

}

   141

   142

/**

   143

 * Determines the foundation for the south bridge head, and tests if the resulting slope is valid.

   144

 *

   145

 * @param axis Axis of the bridge

   146

 * @param tileh Slope of the tile under the south bridge head; returns slope on top of foundation

   147

 * @param z TileZ corresponding to tileh, gets modified as well

   148

 * @return Error or cost for bridge foundation

   149

 */

   150

static CommandCost CheckBridgeSlopeSouth(Axis axis, Slope *tileh, uint *z)

   151

{

   152

	Foundation f = GetBridgeFoundation(*tileh, axis);

   153

	*z += ApplyFoundationToSlope(f, tileh);

   154

   155

	Slope valid_inclined = (axis == AXIS_X ? SLOPE_SW : SLOPE_SE);

   156

	if ((*tileh != SLOPE_FLAT) && (*tileh != valid_inclined)) return CMD_ERROR;

   157

   158

	if (f == FOUNDATION_NONE) return CommandCost();

   159

   160

	return CommandCost(EXPENSES_CONSTRUCTION, _price.terraform);

   161

}

   162

   163

bool CheckBridge_Stuff(BridgeType bridge_type, uint bridge_len, uint32 flags)

   164

{

   165

	if (flags & DC_QUERY_COST) {

   166

		return bridge_len <= (_settings_game.construction.longbridges ? 100U : 16U);

   167

	}

   168

   169

	if (bridge_type >= MAX_BRIDGES) return false;

   170

   171

	const BridgeSpec *b = GetBridgeSpec(bridge_type);

   172

	if (b->avail_year > _cur_year) return false;

   173

   174

	uint max = b->max_length;

   175

	if (max >= 16 && _settings_game.construction.longbridges) max = 100;

   176

   177

	return b->min_length <= bridge_len && bridge_len <= max;

   178

}

   179

   180

/** Build a Bridge

   181

 * @param end_tile end tile

   182

 * @param flags type of operation

   183

 * @param p1 packed start tile coords (~ dx)

   184

 * @param p2 various bitstuffed elements

   185

 * - p2 = (bit 0- 7) - bridge type (hi bh)

   186

 * - p2 = (bit 8-..) - rail type or road types.

   187

 * - p2 = (bit 15  ) - set means road bridge.

   188

 */

   189

CommandCost CmdBuildBridge(TileIndex end_tile, uint32 flags, uint32 p1, uint32 p2)

   190

{

   191

	BridgeType bridge_type;

   192

	RailType railtype = INVALID_RAILTYPE;

   193

	RoadTypes roadtypes = ROADTYPES_NONE;

   194

	uint x;

   195

	uint y;

   196

	uint sx;

   197

	uint sy;

   198

	TileIndex tile_start;

   199

	TileIndex tile_end;

   200

	Slope tileh_start;

   201

	Slope tileh_end;

   202

	uint z_start;

   203

	uint z_end;

   204

	TileIndex tile;

   205

	TileIndexDiff delta;

   206

	uint bridge_len;

   207

	Axis direction;

   208

	CommandCost cost(EXPENSES_CONSTRUCTION);

   209

	CommandCost ret;

   210

	bool replace_bridge = false;

   211

	BridgeType replaced_bridge_type;

   212

	TransportType transport_type;

   213

   214

	/* unpack parameters */

   215

	bridge_type = GB(p2, 0, 8);

   216

   217

	if (p1 >= MapSize()) return CMD_ERROR;

   218

   219

	transport_type = (TransportType)GB(p2, 15, 2);

   220

   221

	/* type of bridge */

   222

	switch (transport_type) {

   223

		case TRANSPORT_ROAD:

   224

			roadtypes = (RoadTypes)GB(p2, 8, 3);

   225

			if (!AreValidRoadTypes(roadtypes) || !HasRoadTypesAvail(_current_player, roadtypes)) return CMD_ERROR;

   226

			break;

   227

   228

		case TRANSPORT_RAIL:

   229

			railtype = (RailType)GB(p2, 8, 8);

   230

			if (!ValParamRailtype(railtype)) return CMD_ERROR;

   231

			break;

   232

   233

		case TRANSPORT_WATER:

   234

			break;

   235

   236

		default:

   237

			/* Airports don't have tunnels. */

   238

			return CMD_ERROR;

   239

	}

   240

   241

	x = TileX(end_tile);

   242

	y = TileY(end_tile);

   243

	sx = TileX(p1);

   244

	sy = TileY(p1);

   245

   246

	/* check if valid, and make sure that (x,y) are smaller than (sx,sy) */

   247

	if (x == sx) {

   248

		if (y == sy) return_cmd_error(STR_5008_CANNOT_START_AND_END_ON);

   249

		direction = AXIS_Y;

   250

		if (y > sy) Swap(y, sy);

   251

	} else if (y == sy) {

   252

		direction = AXIS_X;

   253

		if (x > sx) Swap(x, sx);

   254

	} else {

   255

		return_cmd_error(STR_500A_START_AND_END_MUST_BE_IN);

   256

	}

   257

   258

	bridge_len = sx + sy - x - y - 1;

   259

	if (transport_type != TRANSPORT_WATER) {

   260

		/* set and test bridge length, availability */

   261

		if (!CheckBridge_Stuff(bridge_type, bridge_len, flags)) return_cmd_error(STR_5015_CAN_T_BUILD_BRIDGE_HERE);

   262

	}

   263

   264

	/* retrieve landscape height and ensure it's on land */

   265

	tile_start = TileXY(x, y);

   266

	tile_end = TileXY(sx, sy);

   267

	if (IsWaterTile(tile_start) || IsWaterTile(tile_end)) {

   268

		return_cmd_error(STR_02A0_ENDS_OF_BRIDGE_MUST_BOTH);

   269

	}

   270

   271

	tileh_start = GetTileSlope(tile_start, &z_start);

   272

	tileh_end = GetTileSlope(tile_end, &z_end);

   273

   274

	CommandCost terraform_cost_north = CheckBridgeSlopeNorth(direction, &tileh_start, &z_start);

   275

	CommandCost terraform_cost_south = CheckBridgeSlopeSouth(direction, &tileh_end,   &z_end);

   276

   277

	if (z_start != z_end) return_cmd_error(STR_BRIDGEHEADS_NOT_SAME_HEIGHT);

   278

   279

	if (IsBridgeTile(tile_start) && IsBridgeTile(tile_end) &&

   280

			GetOtherBridgeEnd(tile_start) == tile_end &&

   281

			GetTunnelBridgeTransportType(tile_start) == transport_type) {

   282

		/* Replace a current bridge. */

   283

   284

		/* If this is a railway bridge, make sure the railtypes match. */

   285

		if (transport_type == TRANSPORT_RAIL && GetRailType(tile_start) != railtype) {

   286

			return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);

   287

		}

   288

   289

		/* Do not replace town bridges with lower speed bridges. */

   290

		if (!(flags & DC_QUERY_COST) && IsTileOwner(tile_start, OWNER_TOWN) &&

   291

				GetBridgeSpec(bridge_type)->speed < GetBridgeSpec(GetBridgeType(tile_start))->speed) {

   292

			Town *t = ClosestTownFromTile(tile_start, UINT_MAX);

   293

   294

			if (t == NULL) {

   295

				return CMD_ERROR;

   296

			} else {

   297

				SetDParam(0, t->index);

   298

				return_cmd_error(STR_2009_LOCAL_AUTHORITY_REFUSES);

   299

			}

   300

		}

   301

   302

		/* Do not replace the bridge with the same bridge type. */

   303

		if (!(flags & DC_QUERY_COST) && bridge_type == GetBridgeType(tile_start)) {

   304

			return_cmd_error(STR_1007_ALREADY_BUILT);

   305

		}

   306

   307

		/* Do not allow replacing another player's bridges. */

   308

		if (!IsTileOwner(tile_start, _current_player) && !IsTileOwner(tile_start, OWNER_TOWN)) {

   309

			return_cmd_error(STR_1024_AREA_IS_OWNED_BY_ANOTHER);

   310

		}

   311

   312

		cost.AddCost((bridge_len + 1) * _price.clear_bridge); // The cost of clearing the current bridge.

   313

		replace_bridge = true;

   314

		replaced_bridge_type = GetBridgeType(tile_start);

   315

   316

		/* Do not remove road types when upgrading a bridge */

   317

		roadtypes |= GetRoadTypes(tile_start);

   318

	} else {

   319

		/* Build a new bridge. */

   320

   321

		bool allow_on_slopes = (_settings_game.construction.build_on_slopes && transport_type != TRANSPORT_WATER);

   322

   323

		/* Try and clear the start landscape */

   324

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

   325

		if (CmdFailed(ret)) return ret;

   326

		cost = ret;

   327

   328

		if (CmdFailed(terraform_cost_north) || (terraform_cost_north.GetCost() != 0 && !allow_on_slopes))

   329

			return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   330

		cost.AddCost(terraform_cost_north);

   331

   332

		/* Try and clear the end landscape */

   333

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

   334

		if (CmdFailed(ret)) return ret;

   335

		cost.AddCost(ret);

   336

   337

		/* false - end tile slope check */

   338

		if (CmdFailed(terraform_cost_south) || (terraform_cost_south.GetCost() != 0 && !allow_on_slopes))

   339

			return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   340

		cost.AddCost(terraform_cost_south);

   341

   342

		if (transport_type == TRANSPORT_WATER && (tileh_start == SLOPE_FLAT || tileh_end == SLOPE_FLAT)) return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   343

	}

   344

   345

	if (!replace_bridge) {

   346

		TileIndex Heads[] = {tile_start, tile_end};

   347

		int i;

   348

   349

		for (i = 0; i < 2; i++) {

   350

			if (MayHaveBridgeAbove(Heads[i])) {

   351

				if (IsBridgeAbove(Heads[i])) {

   352

					TileIndex north_head = GetNorthernBridgeEnd(Heads[i]);

   353

   354

					if (direction == GetBridgeAxis(Heads[i])) return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);

   355

   356

					if (z_start + TILE_HEIGHT == GetBridgeHeight(north_head)) {

   357

						return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);

   358

					}

   359

				}

   360

			}

   361

		}

   362

	}

   363

   364

	/* do the drill? */

   365

	if (flags & DC_EXEC) {

   366

		DiagDirection dir = AxisToDiagDir(direction);

   367

		Owner owner = (replace_bridge && IsTileOwner(tile_start, OWNER_TOWN)) ? OWNER_TOWN : _current_player;

   368

   369

		switch (transport_type) {

   370

			case TRANSPORT_RAIL:

   371

				MakeRailBridgeRamp(tile_start, owner, bridge_type, dir,                 railtype);

   372

				MakeRailBridgeRamp(tile_end,   owner, bridge_type, ReverseDiagDir(dir), railtype);

   373

				break;

   374

   375

			case TRANSPORT_ROAD:

   376

				MakeRoadBridgeRamp(tile_start, owner, bridge_type, dir,                 roadtypes);

   377

				MakeRoadBridgeRamp(tile_end,   owner, bridge_type, ReverseDiagDir(dir), roadtypes);

   378

				break;

   379

   380

			case TRANSPORT_WATER:

   381

				MakeAqueductBridgeRamp(tile_start, owner, dir);

   382

				MakeAqueductBridgeRamp(tile_end,   owner, ReverseDiagDir(dir));

   383

				break;

   384

   385

			default:

   386

				NOT_REACHED();

   387

				break;

   388

		}

   389

		MarkTileDirtyByTile(tile_start);

   390

		MarkTileDirtyByTile(tile_end);

   391

	}

   392

   393

	delta = (direction == AXIS_X ? TileDiffXY(1, 0) : TileDiffXY(0, 1));

   394

	for (tile = tile_start + delta; tile != tile_end; tile += delta) {

   395

		if (GetTileMaxZ(tile) > z_start) return_cmd_error(STR_BRIDGE_TOO_LOW_FOR_TERRAIN);

   396

   397

		if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile) && !replace_bridge) {

   398

			/* Disallow crossing bridges for the time being */

   399

			return_cmd_error(STR_5007_MUST_DEMOLISH_BRIDGE_FIRST);

   400

		}

   401

   402

		switch (GetTileType(tile)) {

   403

			case MP_WATER:

   404

				if (!EnsureNoVehicleOnGround(tile)) return_cmd_error(STR_980E_SHIP_IN_THE_WAY);

   405

				if (!IsWater(tile) && !IsCoast(tile)) goto not_valid_below;

   406

				break;

   407

   408

			case MP_RAILWAY:

   409

				if (!IsPlainRailTile(tile)) goto not_valid_below;

   410

				break;

   411

   412

			case MP_ROAD:

   413

				if (IsRoadDepot(tile)) goto not_valid_below;

   414

				break;

   415

   416

			case MP_TUNNELBRIDGE:

   417

				if (IsTunnel(tile)) break;

   418

				if (replace_bridge) break;

   419

				if (direction == DiagDirToAxis(GetTunnelBridgeDirection(tile))) goto not_valid_below;

   420

				if (z_start < GetBridgeHeight(tile)) goto not_valid_below;

   421

				break;

   422

   423

			case MP_UNMOVABLE:

   424

				if (!IsOwnedLand(tile)) goto not_valid_below;

   425

				break;

   426

   427

			case MP_CLEAR:

   428

				break;

   429

   430

			default:

   431

not_valid_below:;

   432

				/* try and clear the middle landscape */

   433

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

   434

				if (CmdFailed(ret)) return ret;

   435

				cost.AddCost(ret);

   436

				break;

   437

		}

   438

   439

		if (flags & DC_EXEC) {

   440

			SetBridgeMiddle(tile, direction);

   441

			MarkTileDirtyByTile(tile);

   442

		}

   443

	}

   444

   445

	if (flags & DC_EXEC && transport_type == TRANSPORT_RAIL) {

   446

		Track track = AxisToTrack(direction);

   447

		AddSideToSignalBuffer(tile_start, INVALID_DIAGDIR, _current_player);

   448

		YapfNotifyTrackLayoutChange(tile_start, track);

   449

	}

   450

   451

	/* for human player that builds the bridge he gets a selection to choose from bridges (DC_QUERY_COST)

   452

	 * It's unnecessary to execute this command every time for every bridge. So it is done only

   453

	 * and cost is computed in "bridge_gui.c". For AI, Towns this has to be of course calculated

   454

	 */

   455

	if (!(flags & DC_QUERY_COST) || (IsValidPlayer(_current_player) && GetPlayer(_current_player)->is_ai)) {

   456

		bridge_len += 2; // begin and end tiles/ramps

   457

   458

		if (IsValidPlayer(_current_player))

   459

			bridge_len = CalcBridgeLenCostFactor(bridge_len);

   460

   461

		cost.AddCost((int64)bridge_len * _price.build_bridge * GetBridgeSpec(bridge_type)->price >> 8);

   462

   463

		/* Aqueducts are a little more expensive. */

   464

		if (transport_type == TRANSPORT_WATER) cost.AddCost((int64)bridge_len * _price.clear_water);

   465

	}

   466

   467

	return cost;

   468

}

   469

   470

   471

/** Build Tunnel.

   472

 * @param start_tile start tile of tunnel

   473

 * @param flags type of operation

   474

 * @param p1 railtype or roadtypes. bit 9 set means road tunnel

   475

 * @param p2 unused

   476

 */

   477

CommandCost CmdBuildTunnel(TileIndex start_tile, uint32 flags, uint32 p1, uint32 p2)

   478

{

   479

	TileIndexDiff delta;

   480

	TileIndex end_tile;

   481

	DiagDirection direction;

   482

	Slope start_tileh;

   483

	Slope end_tileh;

   484

	TransportType transport_type = (TransportType)GB(p1, 9, 1);

   485

	uint start_z;

   486