1

/* $Id$ */

     2

     3

/** @file tunnelbridge_cmd.c

     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 "road_map.h"

    11

#include "table/sprites.h"

    12

#include "table/strings.h"

    13

#include "functions.h"

    14

#include "map.h"

    15

#include "tile.h"

    16

#include "tunnel_map.h"

    17

#include "vehicle.h"

    18

#include "viewport.h"

    19

#include "command.h"

    20

#include "player.h"

    21

#include "town.h"

    22

#include "sound.h"

    23

#include "variables.h"

    24

#include "bridge.h"

    25

#include "train.h"

    26

    27

#include "table/bridge_land.h"

    28

    29

extern const byte _track_sloped_sprites[14];

    30

extern const SpriteID _water_shore_sprites[15];

    31

    32

extern void DrawCanalWater(TileIndex tile);

    33

    34

const Bridge orig_bridge[] = {

    35

/*

    36

	   year of availablity

    37

	   |  minimum length

    38

	   |  |   maximum length

    39

	   |  |   |    price

    40

	   |  |   |    |    maximum speed

    41

	   |  |   |    |    |  sprite to use in GUI                string with description

    42

	   |  |   |    |    |  |                                   |                            */

    43

	{  0, 0, 16,  80,  32, 0xA24                             , STR_5012_WOODEN             , NULL, 0 },

    44

	{  0, 0,  2, 112,  48, 0xA26 | PALETTE_TO_STRUCT_RED     , STR_5013_CONCRETE           , NULL, 0 },

    45

	{ 10, 0,  5, 144,  64, 0xA25                             , STR_500F_GIRDER_STEEL       , NULL, 0 },

    46

	{  0, 2, 10, 168,  80, 0xA22 | PALETTE_TO_STRUCT_CONCRETE, STR_5011_SUSPENSION_CONCRETE, NULL, 0 },

    47

	{ 10, 3, 16, 185,  96, 0xA22                             , STR_500E_SUSPENSION_STEEL   , NULL, 0 },

    48

	{ 10, 3, 16, 192, 112, 0xA22 | PALETTE_TO_STRUCT_YELLOW  , STR_500E_SUSPENSION_STEEL   , NULL, 0 },

    49

	{ 10, 3,  7, 224, 160, 0xA23                             , STR_5010_CANTILEVER_STEEL   , NULL, 0 },

    50

	{ 10, 3,  8, 232, 208, 0xA23 | PALETTE_TO_STRUCT_BROWN   , STR_5010_CANTILEVER_STEEL   , NULL, 0 },

    51

	{ 10, 3,  9, 248, 240, 0xA23 | PALETTE_TO_STRUCT_RED     , STR_5010_CANTILEVER_STEEL   , NULL, 0 },

    52

	{ 10, 0,  2, 240, 256, 0xA27                             , STR_500F_GIRDER_STEEL       , NULL, 0 },

    53

	{ 75, 2, 16, 255, 320, 0xA28                             , STR_5014_TUBULAR_STEEL      , NULL, 0 },

    54

	{ 85, 2, 32, 380, 512, 0xA28 | PALETTE_TO_STRUCT_YELLOW  , STR_5014_TUBULAR_STEEL      , NULL, 0 },

    55

	{ 90, 2, 32, 510, 608, 0xA28 | PALETTE_TO_STRUCT_GREY    , STR_BRIDGE_TUBULAR_SILICON  , NULL, 0 }

    56

};

    57

    58

Bridge _bridge[MAX_BRIDGES];

    59

    60

    61

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

    62

// 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,

    63

int CalcBridgeLenCostFactor(int x)

    64

{

    65

	int n;

    66

	int r;

    67

    68

	if (x < 2) return x;

    69

	x -= 2;

    70

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

    71

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

    72

		r += n * n;

    73

		x -= n;

    74

	}

    75

}

    76

    77

enum {

    78

	// foundation, whole tile is leveled up (tileh's 7, 11, 13, 14) --> 3 corners raised

    79

	BRIDGE_FULL_LEVELED_FOUNDATION = 1 << 7 | 1 << 11 | 1 << 13 | 1 << 14,

    80

	// foundation, tile is partly leveled up (tileh's 1, 2, 4, 8) --> 1 corner raised

    81

	BRIDGE_PARTLY_LEVELED_FOUNDATION = 1 << 1 | 1 << 2 | 1 << 4 | 1 << 8,

    82

	// no foundations (X,Y direction) (tileh's 0, 3, 6, 9, 12)

    83

	BRIDGE_NO_FOUNDATION = 1 << 0 | 1 << 3 | 1 << 6 | 1 << 9 | 1 << 12,

    84

};

    85

    86

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

    87

{

    88

	const Bridge *bridge = &_bridge[index];

    89

	assert(table < 7);

    90

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

    91

		return _bridge_sprite_table[index][table];

    92

	} else {

    93

		return bridge->sprite_table[table];

    94

	}

    95

}

    96

    97

/**

    98

 * Determines which piece of a bridge is contained in the current tile

    99

 * @param tile The tile to analyze

   100

 * @return the piece

   101

 */

   102

static inline int GetBridgePiece(TileIndex tile)

   103

{

   104

	return GB(_m[tile].m2, 0, 4);

   105

}

   106

   107

/**

   108

 * Determines the type of bridge on a tile

   109

 * @param tile The tile to analyze

   110

 * @return The bridge type

   111

 */

   112

static inline int GetBridgeType(TileIndex tile)

   113

{

   114

	return GB(_m[tile].m2, 4, 4);

   115

}

   116

   117

/**	check if bridge can be built on slope

   118

 *	direction 0 = X-axis, direction 1 = Y-axis

   119

 *	is_start_tile = false		<-- end tile

   120

 *	is_start_tile = true		<-- start tile

   121

 */

   122

static uint32 CheckBridgeSlope(Axis direction, uint tileh, bool is_start_tile)

   123

{

   124

	if (IsSteepTileh(tileh)) return CMD_ERROR;

   125

   126

	if (is_start_tile) {

   127

		/* check slope at start tile

   128

				- no extra cost

   129

				- direction X: tiles 0, 12

   130

				- direction Y: tiles 0,  9

   131

		*/

   132

		if ((direction == AXIS_X ? 0x1001 : 0x201) & (1 << tileh)) return 0;

   133

   134

		// disallow certain start tiles to avoid certain crooked bridges

   135

		if (tileh == 2) return CMD_ERROR;

   136

	} else {

   137

		/*	check slope at end tile

   138

				- no extra cost

   139

				- direction X: tiles 0, 3

   140

				- direction Y: tiles 0, 6

   141

		*/

   142

		if ((direction == AXIS_X ? 0x9 : 0x41) & (1 << tileh)) return 0;

   143

   144

		// disallow certain end tiles to avoid certain crooked bridges

   145

		if (tileh == 8) return CMD_ERROR;

   146

	}

   147

   148

	/*	disallow common start/end tiles to avoid certain crooked bridges e.g.

   149

	 *	start-tile:	X 2,1 Y 2,4 (2 was disabled before)

   150

	 *	end-tile:		X 8,4 Y 8,1 (8 was disabled before)

   151

	 */

   152

	if ((tileh == 1 && is_start_tile != (direction != AXIS_X)) ||

   153

			(tileh == 4 && is_start_tile == (direction != AXIS_X))) {

   154

		return CMD_ERROR;

   155

	}

   156

   157

	// slope foundations

   158

	if (BRIDGE_FULL_LEVELED_FOUNDATION & (1 << tileh) || BRIDGE_PARTLY_LEVELED_FOUNDATION & (1 << tileh))

   159

		return _price.terraform;

   160

   161

	return CMD_ERROR;

   162

}

   163

   164

uint32 GetBridgeLength(TileIndex begin, TileIndex end)

   165

{

   166

	int x1 = TileX(begin);

   167

	int y1 = TileY(begin);

   168

	int x2 = TileX(end);

   169

	int y2 = TileY(end);

   170

   171

	return abs(x2 + y2 - x1 - y1) - 1;

   172

}

   173

   174

bool CheckBridge_Stuff(byte bridge_type, uint bridge_len)

   175

{

   176

	const Bridge *b = &_bridge[bridge_type];

   177

	uint max; // max possible length of a bridge (with patch 100)

   178

   179

	if (bridge_type >= MAX_BRIDGES) return false;

   180

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

   181

   182

	max = b->max_length;

   183

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

   184

   185

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

   186

}

   187

   188

/** Build a Bridge

   189

 * @param x,y end tile coord

   190

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

   191

 * @param p2 various bitstuffed elements

   192

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

   193

 * - p2 = (bit 8-..) - rail type. bit15 ((x>>8)&0x80) means road bridge.

   194

 */

   195

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

   196

{

   197

	int bridge_type;

   198

	byte m5;

   199

	TransportType transport;

   200

	RailType railtype;

   201

	int sx,sy;

   202

	TileInfo ti_start, ti_end;

   203

	TileIndex tile;

   204

	TileIndexDiff delta;

   205

	uint bridge_len;

   206

	uint odd_middle_part;

   207

	Axis direction;

   208

	uint i;

   209

	int32 cost, terraformcost, ret;

   210

	bool allow_on_slopes;

   211

   212

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   213

   214

	/* unpack parameters */

   215

	bridge_type = GB(p2, 0, 8);

   216

   217

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

   218

   219

	// type of bridge

   220

	if (HASBIT(p2, 15)) {

   221

		railtype = 0;

   222

		transport = TRANSPORT_ROAD;

   223

	} else {

   224

		if (!ValParamRailtype(GB(p2, 8, 8))) return CMD_ERROR;

   225

		railtype = GB(p2, 8, 8);

   226

		transport = TRANSPORT_RAIL;

   227

	}

   228

   229

	sx = TileX(p1) * 16;

   230

	sy = TileY(p1) * 16;

   231

   232

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

   233

	if (x == sx) {

   234

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

   235

		direction = AXIS_Y;

   236

		if (y > sy) {

   237

			intswap(y,sy);

   238

			intswap(x,sx);

   239

		}

   240

	} else if (y == sy) {

   241

		direction = AXIS_X;

   242

		if (x > sx) {

   243

			intswap(y,sy);

   244

			intswap(x,sx);

   245

		}

   246

	} else {

   247

		return_cmd_error(STR_500A_START_AND_END_MUST_BE_IN);

   248

	}

   249

   250

	/* set and test bridge length, availability */

   251

	bridge_len = ((sx + sy - x - y) >> 4) - 1;

   252

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

   253

   254

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

   255

	if ((

   256

				FindLandscapeHeight(&ti_end, sx, sy),

   257

				ti_end.type == MP_WATER && ti_end.map5 == 0

   258

			) || (

   259

				FindLandscapeHeight(&ti_start, x, y),

   260

				ti_start.type == MP_WATER && ti_start.map5 == 0

   261

			)) {

   262

		return_cmd_error(STR_02A0_ENDS_OF_BRIDGE_MUST_BOTH);

   263

	}

   264

   265

	if (BRIDGE_FULL_LEVELED_FOUNDATION & (1 << ti_start.tileh)) {

   266

		ti_start.z += 8;

   267

		ti_start.tileh = 0;

   268

	}

   269

   270

	if (BRIDGE_FULL_LEVELED_FOUNDATION & (1 << ti_end.tileh)) {

   271

		ti_end.z += 8;

   272

		ti_end.tileh = 0;

   273

	}

   274

   275

	if (ti_start.z != ti_end.z)

   276

		return_cmd_error(STR_5009_LEVEL_LAND_OR_WATER_REQUIRED);

   277

   278

   279

	// Towns are not allowed to use bridges on slopes.

   280

	allow_on_slopes = (!_is_old_ai_player

   281

	                   && _current_player != OWNER_TOWN && _patches.build_on_slopes);

   282

   283

	/* Try and clear the start landscape */

   284

   287

	cost = ret;

   288

   289

	// true - bridge-start-tile, false - bridge-end-tile

   290

	terraformcost = CheckBridgeSlope(direction, ti_start.tileh, true);

   291

	if (CmdFailed(terraformcost) || (terraformcost && !allow_on_slopes))

   292

		return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   293

	cost += terraformcost;

   294

   295

	/* Try and clear the end landscape */

   296

   297

	ret = DoCommandByTile(ti_end.tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);

   299

	cost += ret;

   300

   301

	// false - end tile slope check

   302

	terraformcost = CheckBridgeSlope(direction, ti_end.tileh, false);

   303

	if (CmdFailed(terraformcost) || (terraformcost && !allow_on_slopes))

   304

		return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   305

	cost += terraformcost;

   306

   307

   308

	/* do the drill? */

   309

	if (flags & DC_EXEC) {

   310

		/* build the start tile */

   311

		ModifyTile(ti_start.tile,

   312

			MP_SETTYPE(MP_TUNNELBRIDGE) |

   313

			MP_MAP2 | MP_MAP3LO | MP_MAPOWNER_CURRENT | MP_MAP5,

   314

			(bridge_type << 4), /* map2 */

   315

			railtype, /* map3_lo */

   316

			0x80 | direction | transport << 1 /* map5 */

   317

		);

   318

   319

		/* build the end tile */

   320

		ModifyTile(ti_end.tile,

   321

			MP_SETTYPE(MP_TUNNELBRIDGE) |

   322

			MP_MAP2 | MP_MAP3LO | MP_MAPOWNER_CURRENT | MP_MAP5,

   323

			(bridge_type << 4), /* map2 */

   324

			railtype, /* map3_lo */

   325

			0x80 | 0x20 | direction | transport << 1 /* map5 */

   326

		);

   327

	}

   328

   329

	// position of middle part of the odd bridge (larger than MAX(i) otherwise)

   330

	odd_middle_part = (bridge_len % 2) ? (bridge_len / 2) : bridge_len;

   331

   332

	tile = ti_start.tile;

   333

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

   334

	for (i = 0; i != bridge_len; i++) {

   335

		uint z;

   336

   337

		tile += delta;

   338

   342

   343

		switch (GetTileType(tile)) {

   344

			case MP_WATER:

   346

				if (_m[tile].m5 > 1) goto not_valid_below;

   347

				m5 = 0xC8;

   348

				break;

   349

   350

			case MP_RAILWAY:

   351

				if (_m[tile].m5 != (direction == AXIS_X ? TRACK_BIT_Y : TRACK_BIT_X)) {

   352

					goto not_valid_below;

   353

				}

   354

				m5 = 0xE0;

   355

				break;

   356

   357

			case MP_STREET:

   358

				if (GetRoadType(tile) != ROAD_NORMAL ||

   359

						GetRoadBits(tile) != (direction == AXIS_X ? ROAD_Y : ROAD_X)) {

   360

					goto not_valid_below;

   361

				}

   362

				m5 = 0xE8;

   363

				break;

   364

   365

			default:

   366

not_valid_below:;

   367

				/* try and clear the middle landscape */

   368

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

   370

				cost += ret;

   371

				m5 = 0xC0;

   372

				break;

   373

		}

   374

   375

		/* do middle part of bridge */

   376

		if (flags & DC_EXEC) {

   377

			_m[tile].m5 = (byte)(m5 | direction | transport << 1);

   378

			SetTileType(tile, MP_TUNNELBRIDGE);

   379

   380

			//bridges pieces sequence (middle parts)

   381

			// bridge len 1: 0

   382

			// bridge len 2: 0 1

   383

			// bridge len 3: 0 4 1

   384

			// bridge len 4: 0 2 3 1

   385

			// bridge len 5: 0 2 5 3 1

   386

			// bridge len 6: 0 2 3 2 3 1

   387

			// bridge len 7: 0 2 3 4 2 3 1

   388

			// #0 - always as first, #1 - always as last (if len>1)

   389

			// #2,#3 are to pair in order

   390

			// for odd bridges: #5 is going in the bridge middle if on even position, #4 on odd (counting from 0)

   391

   392

			if (i == 0) { // first tile

   393

				m5 = 0;

   394

			} else if (i == bridge_len - 1) { // last tile

   395

				m5 = 1;

   396

			} else if (i == odd_middle_part) { // we are on the middle of odd bridge: #5 on even pos, #4 on odd

   397

				m5 = 5 - (i % 2);

   398

			} else {

   399

					// generate #2 and #3 in turns [i%2==0], after the middle of odd bridge

   400

					// this sequence swaps [... XOR (i>odd_middle_part)],

   401

					// for even bridges XOR does not apply as odd_middle_part==bridge_len

   402

					m5 = 2 + ((i % 2 == 0) ^ (i > odd_middle_part));

   403

			}

   404

   405

			_m[tile].m2 = (bridge_type << 4) | m5;

   406

			SB(_m[tile].m3, 4, 4, railtype);

   407

   408

			MarkTileDirtyByTile(tile);

   409

		}

   410

	}

   411

   412

	SetSignalsOnBothDir(ti_start.tile, direction == AXIS_X ? TRACK_X : TRACK_Y);

   413

   414

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

   415

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

   416

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

   417

	*/

   418

	if (!(flags & DC_QUERY_COST)) {

   419

		const Bridge *b = &_bridge[bridge_type];

   420

   421

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

   422

   423

		if (_current_player < MAX_PLAYERS && !_is_old_ai_player)

   424

			bridge_len = CalcBridgeLenCostFactor(bridge_len);

   425

   426

		cost += (int64)bridge_len * _price.build_bridge * b->price >> 8;

   427

	}

   428

   429

	return cost;

   430

}

   431

   432

   433

/** Build Tunnel.

   434

 * @param x,y start tile coord of tunnel

   435

 * @param p1 railtype, 0x200 for road tunnel

   436

 * @param p2 unused

   437

 */

   438

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

   439

{

   440

	TileIndexDiff delta;

   441

	TileIndex start_tile;

   442

	TileIndex end_tile;

   443

	DiagDirection direction;

   444

	uint start_tileh;

   445

	uint end_tileh;

   446

	uint start_z;

   447

	uint end_z;

   448

	int32 cost;

   449

	int32 ret;

   450

   451

	_build_tunnel_endtile = 0;

   452

   453

	if (p1 != 0x200 && !ValParamRailtype(p1)) return CMD_ERROR;

   454

   455

	start_tile = TileVirtXY(x, y);

   456

	start_tileh = GetTileSlope(start_tile, &start_z);

   457

   458

	switch (start_tileh) {

   459

		case  3: direction = DIAGDIR_SW; break;

   460

		case  6: direction = DIAGDIR_SE; break;

   461

		case  9: direction = DIAGDIR_NW; break;

   462

		case 12: direction = DIAGDIR_NE; break;

   463

		default: return_cmd_error(STR_500B_SITE_UNSUITABLE_FOR_TUNNEL);

   464

	}

   465

   466

	ret = DoCommandByTile(start_tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);

   467

	if (CmdFailed(ret)) return ret;

   468

	cost = _price.build_tunnel + ret;

   469

   470

	delta = TileOffsByDir(direction);

   471

	end_tile = start_tile;

   472

	for (;;) {

   473

		end_tile += delta;

   474

		end_tileh = GetTileSlope(end_tile, &end_z);

   475

   476

		if (start_z == end_z) break;

   477

   478

		if (!_cheats.crossing_tunnels.value && IsTunnelInWay(end_tile, start_z)) {

   479

			return_cmd_error(STR_5003_ANOTHER_TUNNEL_IN_THE_WAY);

   480

		}

   481

   482

		cost += _price.build_tunnel;

   483

		cost += cost >> 3;

   484

		if (cost >= 400000000) cost = 400000000;

   485

	}

   486

   487

	// if the command fails from here on we want the end tile to be highlighted

   488

	_build_tunnel_endtile = end_tile;

   489

   490

	// slope of end tile must be complementary to the slope of the start tile

   491

	if (end_tileh != (15 ^ start_tileh)) {

   492

		ret = DoCommandByTile(end_tile, end_tileh & start_tileh, 0, flags, CMD_TERRAFORM_LAND);

   493

		if (CmdFailed(ret)) return_cmd_error(STR_5005_UNABLE_TO_EXCAVATE_LAND);

   494

	} else {