1

#include "stdafx.h"

     2

#include "ttd.h"

     3

#include "table/strings.h"

     4

#include "map.h"

     5

#include "vehicle.h"

     6

#include "viewport.h"

     7

#include "command.h"

     8

#include "player.h"

     9

#include "town.h"

    10

#include "sound.h"

    11

    12

extern void DrawCanalWater(uint tile);

    13

    14

static const byte _bridge_available_year[MAX_BRIDGES] = {

    15

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

    16

};

    17

    18

static const byte _bridge_minlen[MAX_BRIDGES] = {

    19

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

    20

};

    21

    22

static const byte _bridge_maxlen[MAX_BRIDGES] = {

    23

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

    24

};

    25

    26

const uint16 _bridge_type_price_mod[MAX_BRIDGES] = {

    27

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

    28

};

    29

    30

const uint16 _bridge_speeds[MAX_BRIDGES] = {

    31

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

    32

};

    33

    34

const PalSpriteID _bridge_sprites[MAX_BRIDGES] = {

    35

	0x0A24, 0x31E8A26, 0x0A25, 0x3208A22,

    36

	0x0A22, 0x3218A22, 0x0A23, 0x31C8A23,

    37

	0x31E8A23, 0x0A27, 0x0A28, 0x3218A28,

    38

	0x3238A28,

    39

};

    40

    41

const StringID _bridge_material[MAX_BRIDGES] = {

    42

	STR_5012_WOODEN,

    43

	STR_5013_CONCRETE,

    44

	STR_500F_GIRDER_STEEL,

    45

	STR_5011_SUSPENSION_CONCRETE,

    46

	STR_500E_SUSPENSION_STEEL,

    47

	STR_500E_SUSPENSION_STEEL,

    48

	STR_5010_CANTILEVER_STEEL,

    49

	STR_5010_CANTILEVER_STEEL,

    50

	STR_5010_CANTILEVER_STEEL,

    51

	STR_500F_GIRDER_STEEL,

    52

	STR_5014_TUBULAR_STEEL,

    53

	STR_5014_TUBULAR_STEEL,

    54

	STR_BRIDGE_TUBULAR_SILICON,

    55

};

    56

    57

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

    58

// 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,

    59

int CalcBridgeLenCostFactor(int x)

    60

{

    61

	int n,r;

    62

	if (x < 2) return x;

    63

	x -= 2;

    64

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

    65

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

    66

		r += n * n;

    67

		x -= n;

    68

	}

    69

}

    70

    71

enum {

    72

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

    73

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

    74

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

    75

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

    76

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

    77

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

    78

};

    79

    80

/*	check if bridge can be built on slope

    81

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

    82

 *	is_start_tile = false		<-- end tile

    83

 *	is_start_tile = true		<-- start tile

    84

 */

    85

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

    86

{

    87

	if (!(tileh & 0x10)) {	// disable building on very steep slopes

    88

    89

		if (is_start_tile) {

    90

			/* check slope at start tile

    91

					- no extra cost

    92

					- direction X: tiles 0,12

    93

					- direction Y: tiles 0, 9

    94

			*/

    95

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

    96

				return 0;

    97

    98

			// disallow certain start tiles to avoid certain crooked bridges

    99

			if (tileh == 2)

   100

				return CMD_ERROR;

   101

   102

		}

   103

		else {

   104

			/*	check slope at end tile

   105

					- no extra cost

   106

					- direction X: tiles 0, 3

   107

					- direction Y: tiles 0, 6

   108

			*/

   109

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

   110

				return 0;

   111

   112

			// disallow certain end tiles to avoid certain crooked bridges

   113

			if (tileh == 8)

   114

				return CMD_ERROR;

   115

   116

		}

   117

   118

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

   119

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

   120

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

   121

		 */

   122

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

   123

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

   124

			return CMD_ERROR;

   125

   126

		// slope foundations

   127

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

   128

			return _price.terraform;

   129

	}

   130

   131

	return CMD_ERROR;

   132

}

   133

   134

uint32 GetBridgeLength(TileIndex begin, TileIndex end)

   135

{

   136

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

   137

	x1 = TileX(begin);

   138

	y1 = TileY(begin);

   139

	x2 = TileX(end);

   140

	y2 = TileY(end);

   141

   142

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

   143

}

   144

   145

bool CheckBridge_Stuff(byte bridge_type, int bridge_len)

   146

{

   147

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

   148

   149

	if (_bridge_available_year[bridge_type] > _cur_year)

   150

				return false;

   151

   152

	max = _bridge_maxlen[bridge_type];

   153

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

   154

		max = 100;

   155

   156

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

   157

		return false;

   158

   159

	return true;

   160

}

   161

   162

/* Build a Bridge

   163

 * x,y - end tile coord

   164

 * p1  - packed start tile coords (~ dx)

   165

 * p2&0xFF - bridge type (hi bh)

   166

 * p2>>8 - rail type. &0x80 means road bridge.

   167

 */

   168

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

   169

{

   170

	int bridge_type;

   171

	byte rail_or_road, railtype, m5;

   172

	int sx,sy;

   173

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

   174

	int bridge_len, odd_middle_part;

   175

	uint direction;

   176

	int i;

   177

	int32 cost, terraformcost, ret;

   178

   179

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   180

   181

	/* unpack parameters */

   182

	bridge_type = p2 & 0xFF;

   183

	railtype = (byte)(p2 >> 8);

   184

   185

	// type of bridge

   186

	if (railtype & 0x80) {

   187

		railtype = 0;

   188

		rail_or_road = 2;

   189

	} else {

   190

		rail_or_road = 0;

   191

	}

   192

   193

	sx = TileX(p1) * 16;

   194

	sy = TileY(p1) * 16;

   195

   196

	direction = 0;

   197

   198

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

   199

	if (x == sx) {

   200

		if (y == sy)

   201

			return_cmd_error(STR_5008_CANNOT_START_AND_END_ON);

   202

		direction = 1;

   203

		if (y > sy) {

   204

			intswap(y,sy);

   205

			intswap(x,sx);

   206

		}

   207

	} else if (y == sy) {

   208

		if (x > sx) {

   209

			intswap(y,sy);

   210

			intswap(x,sx);

   211

		}

   212

	} else

   213

		return_cmd_error(STR_500A_START_AND_END_MUST_BE_IN);

   214

   215

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

   216

	if (

   217

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

   218

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

   219

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

   220

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

   221

		return_cmd_error(STR_02A0_ENDS_OF_BRIDGE_MUST_BOTH);

   222

   223

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

   224

		ti_start.z += 8;

   225

		ti_start.tileh = 0;

   226

	}

   227

   228

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

   229

		ti_end.z += 8;

   230

		ti_end.tileh = 0;

   231

	}

   232

   233

	if (ti_start.z != ti_end.z)

   234

		return_cmd_error(STR_5009_LEVEL_LAND_OR_WATER_REQUIRED);

   235

   236

	_error_message = STR_500C;

   237

   238

	/* try and clear the start landscape */

   239

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

   240

		return CMD_ERROR;

   241

	cost = ret;

   242

   243

	terraformcost = CheckBridgeSlope(direction, ti_start.tileh, true);	// true - bridge-start-tile, false - bridge-end-tile

   244

   245

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

   246

	if (terraformcost == CMD_ERROR ||

   247

		 (terraformcost && ((!_patches.ainew_active && _is_ai_player) || _current_player == OWNER_TOWN || !_patches.build_on_slopes)))

   248

		return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   249

   250

	cost += terraformcost;

   251

   252

	/* try and clear the end landscape */

   253

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

   254

		return CMD_ERROR;

   255

	cost += ret;

   256

   257

	terraformcost = CheckBridgeSlope(direction, ti_end.tileh, false);	// false - end tile slope check

   258

   259

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

   260

	if (terraformcost == CMD_ERROR ||

   261

		 (terraformcost && ((!_patches.ainew_active && _is_ai_player) || _current_player == OWNER_TOWN || !_patches.build_on_slopes)))

   262

		return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   263

   264

	cost += terraformcost;

   265

   266

	/* do the drill? */

   267

	if (flags & DC_EXEC) {

   268

		/* build the start tile */

   269

		ModifyTile(ti_start.tile,

   270

			MP_SETTYPE(MP_TUNNELBRIDGE) |

   271

			MP_MAP2 | MP_MAP3LO | MP_MAPOWNER_CURRENT | MP_MAP5,

   272

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

   273

			railtype, /* map3_lo */

   274

			0x80 | direction | rail_or_road /* map5 */

   275

		);

   276

   277

		/* build the end tile */

   278

		ModifyTile(ti_end.tile,

   279

			MP_SETTYPE(MP_TUNNELBRIDGE) |

   280

			MP_MAP2 | MP_MAP3LO | MP_MAPOWNER_CURRENT | MP_MAP5,

   281

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

   282

			railtype, /* map3_lo */

   283

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

   284

		);

   285

	}

   286

   287

	/* set various params */

   288

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

   289

   290

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

   291

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

   292

   293

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

   294

		if (direction != 0)

   295

			y+=16;

   296

		else

   297

			x+=16;

   298

   299

		FindLandscapeHeight(&ti, x, y);

   300

   301

		_error_message = STR_5009_LEVEL_LAND_OR_WATER_REQUIRED;

   302

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

   303

			return CMD_ERROR;

   304

   305

		// Find ship below

   306

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

   307

		{

   308

			_error_message = STR_980E_SHIP_IN_THE_WAY;

   309

			return CMD_ERROR;

   310

		}

   311

   312

		if (ti.type == MP_WATER) {

   313

			if (ti.map5 > 1) goto not_valid_below;

   314

			m5 = 0xC8;

   315

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

   316

			if (direction == 0) {

   317

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

   318

			} else {

   319

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

   320

			}

   321

			m5 = 0xE0;

   322

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

   323

			if (direction == 0) {

   324

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

   325

			} else {

   326

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

   327

			}

   328

			m5 = 0xE8;

   329

		} else {

   330

not_valid_below:;

   331

			/* try and clear the middle landscape */

   332

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

   333

				return CMD_ERROR;

   334

			cost += ret;

   335

			m5 = 0xC0;

   336

		}

   337

   338

		/* do middle part of bridge */

   339

		if (flags & DC_EXEC) {

   340

			_map5[ti.tile] = (byte)(m5 | direction | rail_or_road);

   341

			SetTileType(ti.tile, MP_TUNNELBRIDGE);

   342

   343

			//bridges pieces sequence (middle parts)

   344

			// bridge len 1: 0

   345

			// bridge len 2: 0 1

   346

			// bridge len 3: 0 4 1

   347

			// bridge len 4: 0 2 3 1

   348

			// bridge len 5: 0 2 5 3 1

   349

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

   350

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

   351

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

   352

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

   353

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

   354

   355

			if(i==0)                    //first tile

   356

				m5 = 0;

   357

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

   358

				m5 = 1;

   359

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

   360

				m5 = 5 - (i%2);

   361

			else {

   362

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

   363

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

   364

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

   365

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

   366

			}

   367

   368

			_map2[ti.tile] = (bridge_type << 4) | m5;

   369

			_map3_lo[ti.tile] &= 0xF;

   370

			_map3_lo[ti.tile] |= (byte)(railtype << 4);

   371

   372

			MarkTileDirtyByTile(ti.tile);

   373

		}

   374

	}

   375

   376

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

   377

   378

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

   379

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

   380

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

   381

	*/

   382

	if (!(flags & DC_QUERY_COST)) {

   383

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

   384

   385

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

   386

			bridge_len = CalcBridgeLenCostFactor(bridge_len);

   387

   388

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

   389

	}

   390

   391

	return cost;

   392

}

   393

   394

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

   395

{

   396

	TileInfo ti;

   397

	int delta;

   398

   399

	delta = TileOffsByDir(dir);

   400

   401

	do {

   402

		tile -= delta;

   403

		FindLandscapeHeightByTile(&ti, tile);

   404

	} while (z < ti.z);

   405

   406

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

   407

		_error_message = STR_5003_ANOTHER_TUNNEL_IN_THE_WAY;

   408

		return false;

   409

	}

   410

   411

	return true;

   412

}

   413

   414

bool CheckTunnelInWay(uint tile, int z)

   415

{

   416

	return DoCheckTunnelInWay(tile,z,0) &&

   417

		DoCheckTunnelInWay(tile,z,1) &&

   418

		DoCheckTunnelInWay(tile,z,2) &&

   419

		DoCheckTunnelInWay(tile,z,3);

   420

}

   421

   422

static byte _build_tunnel_bh;

   423

static byte _build_tunnel_railtype;

   424

   425

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

   426

{

   427

	uint end_tile;

   428

	int direction;

   429

	int32 cost, ret;

   430

	TileInfo ti;

   431

	uint z;

   432

   433

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

   434

		return CMD_ERROR;

   435

   436

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

   437

	direction = 0;

   438

	if (x == x2) {

   439

		if (y == y2)

   440

			return_cmd_error(STR_5008_CANNOT_START_AND_END_ON);

   441

		direction++;

   442

		if (y > y2) {

   443

			intswap(y,y2);

   444

			intswap(x,x2);

   445

			exc_tile|=2;

   446

		}

   447

	} else if (y == y2) {

   448

		if (x > x2) {

   449

			intswap(y,y2);

   450

			intswap(x,x2);

   451

			exc_tile|=2;

   452

		}

   453

	} else

   454

		return_cmd_error(STR_500A_START_AND_END_MUST_BE_IN);

   455

   456

	cost = 0;

   457

   458

	FindLandscapeHeight(&ti, x2, y2);

   459

	end_tile = ti.tile;

   460

	z = ti.z;

   461

   462

	if (exc_tile != 3) {

   463

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

   464

			return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   465

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

   466

		if (ret == CMD_ERROR)

   467

			return CMD_ERROR;

   468

		cost += ret;

   469

	}

   470

	cost += _price.build_tunnel;

   471

   472

	for(;;) {

   473

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

   474

   475

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

   476

			break;

   477

   478

		FindLandscapeHeight(&ti, x2, y2);

   479

		if (ti.z <= z)

   480

			return_cmd_error(STR_5002);

   481

   482

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

   483

			return CMD_ERROR;

   484

   485

		cost += _price.build_tunnel;

   486

		cost += (cost >> 3);

   487

   488

		if (cost >= 400000000)

   489

			cost = 400000000;

   490

	}

   491

   492

	FindLandscapeHeight(&ti, x2, y2);

   493

	if (ti.z != z)

   494

		return_cmd_error(STR_5004);

   495

   496

	if (exc_tile != 1) {

   497

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

   498

			return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   499

   500

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

   501

		if (ret == CMD_ERROR)

   502

			return CMD_ERROR;

   503

		cost += ret;

   504

	}

   505

   506

	if (flags & DC_EXEC) {

   507

		ModifyTile(ti.tile,

   508

			MP_SETTYPE(MP_TUNNELBRIDGE) |

   509

			MP_MAP3LO | MP_MAPOWNER_CURRENT | MP_MAP5,

   510

			_build_tunnel_railtype, /* map3lo */

   511

			((_build_tunnel_bh << 1) | 2) - direction /* map5 */

   512

		);

   513

   514

		ModifyTile(end_tile,

   515

			MP_SETTYPE(MP_TUNNELBRIDGE) |

   516

			MP_MAP3LO | MP_MAPOWNER_CURRENT | MP_MAP5,

   517

			_build_tunnel_railtype, /* map3lo */

   518

			(_build_tunnel_bh << 1) | (direction ? 3:0)/* map5 */

   519

		);

   520

   521

		UpdateSignalsOnSegment(end_tile, direction?7:1);

   522

	}

   523