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 "sound.h"

    16

#include "pbs.h"

    17

#include "debug.h"

    18

#include "variables.h"

    19

    20

extern void DrawCanalWater(TileIndex tile);

    21

    22

static const byte _bridge_available_year[MAX_BRIDGES] = {

    23

	0, 0, 10, 0, 10, 10, 10, 10, 10, 10, 75, 85, 90

    24

};

    25

    26

static const byte _bridge_minlen[MAX_BRIDGES] = {

    27

	0, 0, 0, 2, 3, 3, 3, 3, 3, 0, 2, 2, 2

    28

};

    29

    30

static const byte _bridge_maxlen[MAX_BRIDGES] = {

    31

	16, 2, 5, 10, 16, 16, 7, 8, 9, 2, 16, 32, 32,

    32

};

    33

    34

const uint16 _bridge_type_price_mod[MAX_BRIDGES] = {

    35

	80, 112, 144, 168, 185, 192, 224, 232, 248, 240, 255, 380, 510,

    36

};

    37

    38

const uint16 _bridge_speeds[MAX_BRIDGES] = {

    39

	0x20, 0x30, 0x40, 0x50, 0x60, 0x70, 0x0A0, 0x0D0, 0x0F0, 0x100, 0x140, 0x200, 0x260

    40

};

    41

    42

const PalSpriteID _bridge_sprites[MAX_BRIDGES] = {

    43

	0x0A24, 0xA26 | PALETTE_TO_STRUCT_RED, 0x0A25, 0xA22 | PALETTE_TO_STRUCT_CONCRETE,

    44

	0x0A22, 0xA22 | PALETTE_TO_STRUCT_YELLOW, 0x0A23, 0xA23 | PALETTE_TO_STRUCT_BROWN,

    45

	0xA23 | PALETTE_TO_STRUCT_RED, 0x0A27, 0x0A28, 0xA28 | PALETTE_TO_STRUCT_YELLOW,

    46

	0xA28 | PALETTE_TO_STRUCT_GREY,

    47

};

    48

    49

const StringID _bridge_material[MAX_BRIDGES] = {

    50

	STR_5012_WOODEN,

    51

	STR_5013_CONCRETE,

    52

	STR_500F_GIRDER_STEEL,

    53

	STR_5011_SUSPENSION_CONCRETE,

    54

	STR_500E_SUSPENSION_STEEL,

    55

	STR_500E_SUSPENSION_STEEL,

    56

	STR_5010_CANTILEVER_STEEL,

    57

	STR_5010_CANTILEVER_STEEL,

    58

	STR_5010_CANTILEVER_STEEL,

    59

	STR_500F_GIRDER_STEEL,

    60

	STR_5014_TUBULAR_STEEL,

    61

	STR_5014_TUBULAR_STEEL,

    62

	STR_BRIDGE_TUBULAR_SILICON,

    63

};

    64

    65

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

    66

// 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,

    67

int CalcBridgeLenCostFactor(int x)

    68

{

    69

	int n,r;

    70

	if (x < 2) return x;

    71

	x -= 2;

    72

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

    73

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

    74

		r += n * n;

    75

		x -= n;

    76

	}

    77

}

    78

    79

enum {

    80

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

    81

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

    82

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

    83

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

    84

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

    85

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

    86

};

    87

    88

/*	check if bridge can be built on slope

    89

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

    90

 *	is_start_tile = false		<-- end tile

    91

 *	is_start_tile = true		<-- start tile

    92

 */

    93

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

    94

{

    95

	if (!IsSteepTileh(tileh)) {	// disable building on very steep slopes

    96

    97

		if (is_start_tile) {

    98

			/* check slope at start tile

    99

					- no extra cost

   100

					- direction X: tiles 0,12

   101

					- direction Y: tiles 0, 9

   102

			*/

   103

			if ((direction?0x201:0x1001) & (1 << tileh))

   104

				return 0;

   105

   106

			// disallow certain start tiles to avoid certain crooked bridges

   107

			if (tileh == 2)

   108

				return CMD_ERROR;

   109

   110

		}

   111

		else {

   112

			/*	check slope at end tile

   113

					- no extra cost

   114

					- direction X: tiles 0, 3

   115

					- direction Y: tiles 0, 6

   116

			*/

   117

			if ((direction?0x41:0x9) & (1 << tileh))

   118

				return 0;

   119

   120

			// disallow certain end tiles to avoid certain crooked bridges

   121

			if (tileh == 8)

   122

				return CMD_ERROR;

   123

   124

		}

   125

   126

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

   127

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

   128

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

   129

		 */

   130

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

   131

			   (tileh == 4 && (is_start_tile == (bool)direction))    )

   132

			return CMD_ERROR;

   133

   134

		// slope foundations

   135

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

   136

			return _price.terraform;

   137

	}

   138

   139

	return CMD_ERROR;

   140

}

   141

   142

uint32 GetBridgeLength(TileIndex begin, TileIndex end)

   143

{

   144

	int x1, y1, x2, y2;	// coordinates of starting and end tiles

   145

	x1 = TileX(begin);

   146

	y1 = TileY(begin);

   147

	x2 = TileX(end);

   148

	y2 = TileY(end);

   149

   150

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

   151

}

   152

   153

bool CheckBridge_Stuff(byte bridge_type, int bridge_len)

   154

{

   155

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

   156

   157

	if (bridge_type >= MAX_BRIDGES) return false;

   158

	if (_bridge_available_year[bridge_type] > _cur_year) return false;

   159

   160

	max = _bridge_maxlen[bridge_type];

   161

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

   162

		max = 100;

   163

   164

	if (bridge_len < _bridge_minlen[bridge_type] || bridge_len > max) return false;

   165

   166

	return true;

   167

}

   168

   169

/** Build a Bridge

   170

 * @param x,y end tile coord

   171

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

   172

 * @param p2 various bitstuffed elements

   173

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

   174

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

   175

 */

   176

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

   177

{

   178

	int bridge_type;

   179

	byte rail_or_road, railtype, m5;

   180

	int sx,sy;

   181

	TileInfo ti_start, ti_end, ti; /* OPT: only 2 of those are ever used */

   182

	int bridge_len, odd_middle_part;

   183

	uint direction;

   184

	int i;

   185

	int32 cost, terraformcost, ret;

   186

	bool allow_on_slopes;

   187

   188

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   189

   190

	/* unpack parameters */

   191

	bridge_type = GB(p2, 0, 8);

   192

	railtype    = GB(p2, 8, 8);

   193

   194

	if (p1 > MapSize()) return CMD_ERROR;

   195

   196

	// type of bridge

   197

	if (HASBIT(railtype, 7)) { // bit 15 of original p2 param

   198

		railtype = 0;

   199

		rail_or_road = 2;

   200

	} else {

   201

		if (!ValParamRailtype(railtype)) return CMD_ERROR;

   202

		rail_or_road = 0;

   203

	}

   204

   205

	sx = TileX(p1) * 16;

   206

	sy = TileY(p1) * 16;

   207

   208

	direction = 0;

   209

   210

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

   211

	if (x == sx) {

   212

		if (y == sy)

   213

			return_cmd_error(STR_5008_CANNOT_START_AND_END_ON);

   214

		direction = 1;

   215

		if (y > sy) {

   216

			intswap(y,sy);

   217

			intswap(x,sx);

   218

		}

   219

	} else if (y == sy) {

   220

		if (x > sx) {

   221

			intswap(y,sy);

   222

			intswap(x,sx);

   223

		}

   224

	} else

   225

		return_cmd_error(STR_500A_START_AND_END_MUST_BE_IN);

   226

   227

	/* set and test bridge length, availability */

   228

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

   229

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

   230

   231

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

   232

	if (

   233

		((FindLandscapeHeight(&ti_end, sx, sy),

   234

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

   235

		((FindLandscapeHeight(&ti_start, x, y),

   236

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

   237

		return_cmd_error(STR_02A0_ENDS_OF_BRIDGE_MUST_BOTH);

   238

   239

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

   240

		ti_start.z += 8;

   241

		ti_start.tileh = 0;

   242

	}

   243

   244

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

   245

		ti_end.z += 8;

   246

		ti_end.tileh = 0;

   247

	}

   248

   249

	if (ti_start.z != ti_end.z)

   250

		return_cmd_error(STR_5009_LEVEL_LAND_OR_WATER_REQUIRED);

   251

   252

	_error_message = STR_500C;

   253

   254

   255

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

   256

	allow_on_slopes = ((!_is_ai_player || _patches.ainew_active)

   257

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

   258

   259

	/* Try and clear the start landscape */

   260

   261

	if (CmdFailed(ret = DoCommandByTile(ti_start.tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR)))

   262

		return CMD_ERROR;

   263

	cost = ret;

   264

   265

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

   266

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

   267

	if (terraformcost == CMD_ERROR || (terraformcost && !allow_on_slopes))

   268

		return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   269

	cost += terraformcost;

   270

   271

	/* Try and clear the end landscape */

   272

   273

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

   274

		return CMD_ERROR;

   275

	cost += ret;

   276

   277

	// false - end tile slope check

   278

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

   279

	if (terraformcost == CMD_ERROR || (terraformcost && !allow_on_slopes))

   280

		return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   281

	cost += terraformcost;

   282

   283

   284

	/* do the drill? */

   285

	if (flags & DC_EXEC) {

   286

		/* build the start tile */

   287

		ModifyTile(ti_start.tile,

   288

			MP_SETTYPE(MP_TUNNELBRIDGE) |

   289

			MP_MAP2 | MP_MAP3LO | MP_MAPOWNER_CURRENT | MP_MAP5,

   290

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

   291

			railtype, /* map3_lo */

   292

			0x80 | direction | rail_or_road /* map5 */

   293

		);

   294

   295

		/* build the end tile */

   296

		ModifyTile(ti_end.tile,

   297

			MP_SETTYPE(MP_TUNNELBRIDGE) |

   298

			MP_MAP2 | MP_MAP3LO | MP_MAPOWNER_CURRENT | MP_MAP5,

   299

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

   300

			railtype, /* map3_lo */

   301

			0x80 | 0x20 | direction | rail_or_road /* map5 */

   302

		);

   303

	}

   304

   305

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

   306

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

   307

   308

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

   309

		if (direction != 0) {

   310

			y += 16;

   311

		} else

   312

			x += 16;

   313

   314

		FindLandscapeHeight(&ti, x, y);

   315

   316

		_error_message = STR_5009_LEVEL_LAND_OR_WATER_REQUIRED;

   317

		if (ti.tileh != 0 && ti.z >= ti_start.z)

   318

			return CMD_ERROR;

   319

   320

		// Find ship below

   321

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

   322

		{

   323

			_error_message = STR_980E_SHIP_IN_THE_WAY;

   324

			return CMD_ERROR;

   325

		}

   326

   327

		if (ti.type == MP_WATER) {

   328

			if (ti.map5 > 1) goto not_valid_below;

   329

			m5 = 0xC8;

   330

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

   331

			if (direction == 0) {

   332

				if (ti.map5 != 2) goto not_valid_below;

   333

			} else {

   334

				if (ti.map5 != 1) goto not_valid_below;

   335

			}

   336

			m5 = 0xE0;

   337

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

   338

			if (direction == 0) {

   339

				if (ti.map5 != 5) goto not_valid_below;

   340

			} else {

   341

				if (ti.map5 != 10) goto not_valid_below;

   342

			}

   343

			m5 = 0xE8;

   344

		} else {

   345

not_valid_below:;

   346

			/* try and clear the middle landscape */

   347

			if (CmdFailed(ret = DoCommandByTile(ti.tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR)))

   348

				return CMD_ERROR;

   349

			cost += ret;

   350

			m5 = 0xC0;

   351

		}

   352

   353

		/* do middle part of bridge */

   354

		if (flags & DC_EXEC) {

   355

			_m[ti.tile].m5 = (byte)(m5 | direction | rail_or_road);

   356

			SetTileType(ti.tile, MP_TUNNELBRIDGE);

   357

   358

			//bridges pieces sequence (middle parts)

   359

			// bridge len 1: 0

   360

			// bridge len 2: 0 1

   361

			// bridge len 3: 0 4 1

   362

			// bridge len 4: 0 2 3 1

   363

			// bridge len 5: 0 2 5 3 1

   364

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

   365

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

   366

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

   367

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

   368

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

   369

   370

			if(i==0)                    //first tile

   371

				m5 = 0;

   372

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

   373

				m5 = 1;

   374

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

   375

				m5 = 5 - (i%2);

   376

			else {

   377

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

   378

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

   379

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

   380

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

   381

			}

   382

   383

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

   384

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

   385

   386

			MarkTileDirtyByTile(ti.tile);

   387

		}

   388

	}

   389

   390

	SetSignalsOnBothDir(ti_start.tile, (direction&1) ? 1 : 0);

   391

   392

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

   393

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

   394

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

   395

	*/

   396

	if (!(flags & DC_QUERY_COST)) {

   397

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

   398

   399

		if (_current_player < MAX_PLAYERS && !(_is_ai_player && !_patches.ainew_active))

   400

			bridge_len = CalcBridgeLenCostFactor(bridge_len);

   401

   402

		cost += ((int64)bridge_len * _price.build_bridge * _bridge_type_price_mod[bridge_type]) >> 8;

   403

	}

   404

   405

	return cost;

   406

}

   407

   408

static bool DoCheckTunnelInWay(TileIndex tile, uint z, uint dir)

   409

{

   410

	TileIndexDiff delta = TileOffsByDir(dir);

   411

	TileInfo ti;

   412

   413

	do {

   414

		tile -= delta;

   415

		FindLandscapeHeightByTile(&ti, tile);

   416

	} while (z < ti.z);

   417

   418

	if (z == ti.z && ti.type == MP_TUNNELBRIDGE && (ti.map5&0xF0) == 0 && (ti.map5&3) == dir) {

   419

		_error_message = STR_5003_ANOTHER_TUNNEL_IN_THE_WAY;

   420

		return false;

   421

	}

   422

   423

	return true;

   424

}

   425

   426

bool CheckTunnelInWay(TileIndex tile, int z)

   427

{

   428

	return DoCheckTunnelInWay(tile,z,0) &&

   429

		DoCheckTunnelInWay(tile,z,1) &&

   430

		DoCheckTunnelInWay(tile,z,2) &&

   431

		DoCheckTunnelInWay(tile,z,3);

   432

}

   433

   434

static byte _build_tunnel_bh;

   435

static byte _build_tunnel_railtype;

   436

   437

static int32 DoBuildTunnel(int x, int y, int x2, int y2, uint32 flags, uint exc_tile)

   438

{

   439

	TileIndex end_tile;

   440

	int direction;

   441

	int32 cost, ret;

   442

	TileInfo ti;

   443

	uint z;

   444

   445

	if ((uint)x > MapMaxX() * 16 - 1 || (uint)y > MapMaxY() * 16 - 1)

   446

		return CMD_ERROR;

   447

   448

	/* check if valid, and make sure that (x,y) is smaller than (x2,y2) */

   449

	direction = 0;

   450

	if (x == x2) {

   451

		if (y == y2)

   452

			return_cmd_error(STR_5008_CANNOT_START_AND_END_ON);

   453

		direction++;

   454

		if (y > y2) {

   455

			intswap(y,y2);

   456

			intswap(x,x2);

   457

			exc_tile|=2;

   458

		}

   459

	} else if (y == y2) {

   460

		if (x > x2) {

   461

			intswap(y,y2);

   462

			intswap(x,x2);

   463

			exc_tile|=2;

   464

		}

   465

	} else

   466

		return_cmd_error(STR_500A_START_AND_END_MUST_BE_IN);

   467

   468

	cost = 0;

   469

   470

	FindLandscapeHeight(&ti, x2, y2);

   471

	end_tile = ti.tile;

   472

	z = ti.z;

   473

   474

	if (exc_tile != 3) {

   475

		if ( (direction ? 9U : 12U) != ti.tileh)

   476

			return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   477

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

   478

		if (CmdFailed(ret)) return CMD_ERROR;

   479

		cost += ret;

   480

	}

   481

	cost += _price.build_tunnel;

   482

   483

	for(;;) {

   484

		if (direction) y2-=16; else x2-=16;

   485

   486

		if (x2 == x && y2 == y)

   487

			break;

   488

   489

		FindLandscapeHeight(&ti, x2, y2);

   490

		if (ti.z <= z)

   491

			return_cmd_error(STR_5002);

   492

   493

		if (!_cheats.crossing_tunnels.value && !CheckTunnelInWay(ti.tile, z))

   494

			return CMD_ERROR;

   495

   496

		cost += _price.build_tunnel;

   497

		cost += (cost >> 3);

   498

   499

		if (cost >= 400000000)

   500

			cost = 400000000;

   501

	}

   502

   503

	FindLandscapeHeight(&ti, x2, y2);

   504

	if (ti.z != z)

   505

		return_cmd_error(STR_5004);

   506

   507

	if (exc_tile != 1) {

   508

		if ( (direction ? 6U : 3U) != ti.tileh)

   509

			return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   510

   511

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

   512

		if (CmdFailed(ret)) return CMD_ERROR;

   513

		cost += ret;

   514

	}

   515