1

#include "stdafx.h"

     2

#include "ttd.h"

     3

#include "table/strings.h"

     4

#include "map.h"

     5

#include "tile.h"

     6

#include "vehicle.h"

     7

#include "viewport.h"

     8

#include "command.h"

     9

#include "player.h"

    10

#include "town.h"

    11

#include "sound.h"

    12

    13

extern void DrawCanalWater(uint tile);

    14

    15

static const byte _bridge_available_year[MAX_BRIDGES] = {

    16

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

    17

};

    18

    19

static const byte _bridge_minlen[MAX_BRIDGES] = {

    20

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

    21

};

    22

    23

static const byte _bridge_maxlen[MAX_BRIDGES] = {

    24

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

    25

};

    26

    27

const uint16 _bridge_type_price_mod[MAX_BRIDGES] = {

    28

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

    29

};

    30

    31

const uint16 _bridge_speeds[MAX_BRIDGES] = {

    32

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

    33

};

    34

    35

const PalSpriteID _bridge_sprites[MAX_BRIDGES] = {

    36

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

    37

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

    38

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

    39

	0x3238A28,

    40

};

    41

    42

const StringID _bridge_material[MAX_BRIDGES] = {

    43

	STR_5012_WOODEN,

    44

	STR_5013_CONCRETE,

    45

	STR_500F_GIRDER_STEEL,

    46

	STR_5011_SUSPENSION_CONCRETE,

    47

	STR_500E_SUSPENSION_STEEL,

    48

	STR_500E_SUSPENSION_STEEL,

    49

	STR_5010_CANTILEVER_STEEL,

    50

	STR_5010_CANTILEVER_STEEL,

    51

	STR_5010_CANTILEVER_STEEL,

    52

	STR_500F_GIRDER_STEEL,

    53

	STR_5014_TUBULAR_STEEL,

    54

	STR_5014_TUBULAR_STEEL,

    55

	STR_BRIDGE_TUBULAR_SILICON,

    56

};

    57

    58

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

    59

// 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,

    60

int CalcBridgeLenCostFactor(int x)

    61

{

    62

	int n,r;

    63

	if (x < 2) return x;

    64

	x -= 2;

    65

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

    66

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

    67

		r += n * n;

    68

		x -= n;

    69

	}

    70

}

    71

    72

enum {

    73

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

    74

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

    75

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

    76

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

    77

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

    78

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

    79

};

    80

    81

/*	check if bridge can be built on slope

    82

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

    83

 *	is_start_tile = false		<-- end tile

    84

 *	is_start_tile = true		<-- start tile

    85

 */

    86

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

    87

{

    88

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

    89

    90

		if (is_start_tile) {

    91

			/* check slope at start tile

    92

					- no extra cost

    93

					- direction X: tiles 0,12

    94

					- direction Y: tiles 0, 9

    95

			*/

    96

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

    97

				return 0;

    98

    99

			// disallow certain start tiles to avoid certain crooked bridges

   100

			if (tileh == 2)

   101

				return CMD_ERROR;

   102

   103

		}

   104

		else {

   105

			/*	check slope at end tile

   106

					- no extra cost

   107

					- direction X: tiles 0, 3

   108

					- direction Y: tiles 0, 6

   109

			*/

   110

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

   111

				return 0;

   112

   113

			// disallow certain end tiles to avoid certain crooked bridges

   114

			if (tileh == 8)

   115

				return CMD_ERROR;

   116

   117

		}

   118

   119

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

   120

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

   121

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

   122

		 */

   123

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

   124

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

   125

			return CMD_ERROR;

   126

   127

		// slope foundations

   128

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

   129

			return _price.terraform;

   130

	}

   131

   132

	return CMD_ERROR;

   133

}

   134

   135

uint32 GetBridgeLength(TileIndex begin, TileIndex end)

   136

{

   137

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

   138

	x1 = TileX(begin);

   139

	y1 = TileY(begin);

   140

	x2 = TileX(end);

   141

	y2 = TileY(end);

   142

   143

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

   144

}

   145

   146

bool CheckBridge_Stuff(byte bridge_type, int bridge_len)

   147

{

   148

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

   149

   150

	if (_bridge_available_year[bridge_type] > _cur_year)

   151

				return false;

   152

   153

	max = _bridge_maxlen[bridge_type];

   154

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

   155

		max = 100;

   156

   157

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

   158

		return false;

   159

   160

	return true;

   161

}

   162

   163

/* Build a Bridge

   164

 * x,y - end tile coord

   165

 * p1  - packed start tile coords (~ dx)

   166

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

   167

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

   168

 */

   169

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

   170

{

   171

	int bridge_type;

   172

	byte rail_or_road, railtype, m5;

   173

	int sx,sy;

   174

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

   175

	int bridge_len, odd_middle_part;

   176

	uint direction;

   177

	int i;

   178

	int32 cost, terraformcost, ret;

   179

   180

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   181

   182

	/* unpack parameters */

   183

	bridge_type = p2 & 0xFF;

   184

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

   185

   186

	// type of bridge

   187

	if (railtype & 0x80) {

   188

		railtype = 0;

   189

		rail_or_road = 2;

   190

	} else {

   191

		rail_or_road = 0;

   192

	}

   193

   194

	sx = TileX(p1) * 16;

   195

	sy = TileY(p1) * 16;

   196

   197

	direction = 0;

   198

   199

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

   200

	if (x == sx) {

   201

		if (y == sy)

   202

			return_cmd_error(STR_5008_CANNOT_START_AND_END_ON);

   203

		direction = 1;

   204

		if (y > sy) {

   205

			intswap(y,sy);

   206

			intswap(x,sx);

   207

		}

   208

	} else if (y == sy) {

   209

		if (x > sx) {

   210

			intswap(y,sy);

   211

			intswap(x,sx);

   212

		}

   213

	} else

   214

		return_cmd_error(STR_500A_START_AND_END_MUST_BE_IN);

   215

   216

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

   217

	if (

   218

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

   219

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

   220

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

   221

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

   222

		return_cmd_error(STR_02A0_ENDS_OF_BRIDGE_MUST_BOTH);

   223

   224

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

   225

		ti_start.z += 8;

   226

		ti_start.tileh = 0;

   227

	}

   228

   229

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

   230

		ti_end.z += 8;

   231

		ti_end.tileh = 0;

   232

	}

   233

   234

	if (ti_start.z != ti_end.z)

   235

		return_cmd_error(STR_5009_LEVEL_LAND_OR_WATER_REQUIRED);

   236

   237

	_error_message = STR_500C;

   238

   239

	/* try and clear the start landscape */

   240

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

   241

		return CMD_ERROR;

   242

	cost = ret;

   243

   244

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

   245

   246

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

   247

	if (terraformcost == CMD_ERROR ||

   248

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

   249

		return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   250

   251

	cost += terraformcost;

   252

   253

	/* try and clear the end landscape */

   254

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

   255

		return CMD_ERROR;

   256

	cost += ret;

   257

   258

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

   259

   260

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

   261

	if (terraformcost == CMD_ERROR ||

   262

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

   263

		return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   264

   265

	cost += terraformcost;

   266

   267

	/* do the drill? */

   268

	if (flags & DC_EXEC) {

   269

		/* build the start tile */

   270

		ModifyTile(ti_start.tile,

   271

			MP_SETTYPE(MP_TUNNELBRIDGE) |

   272

			MP_MAP2 | MP_MAP3LO | MP_MAPOWNER_CURRENT | MP_MAP5,

   273

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

   274

			railtype, /* map3_lo */

   275

			0x80 | direction | rail_or_road /* map5 */

   276

		);

   277

   278

		/* build the end tile */

   279

		ModifyTile(ti_end.tile,

   280

			MP_SETTYPE(MP_TUNNELBRIDGE) |

   281

			MP_MAP2 | MP_MAP3LO | MP_MAPOWNER_CURRENT | MP_MAP5,

   282

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

   283

			railtype, /* map3_lo */

   284

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

   285

		);

   286

	}

   287

   288

	/* set various params */

   289

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

   290

   291

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

   292

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

   293

   294

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

   295

		if (direction != 0)

   296

			y+=16;

   297

		else

   298

			x+=16;

   299

   300

		FindLandscapeHeight(&ti, x, y);

   301

   302

		_error_message = STR_5009_LEVEL_LAND_OR_WATER_REQUIRED;

   303

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

   304

			return CMD_ERROR;

   305

   306

		// Find ship below

   307

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

   308

		{

   309

			_error_message = STR_980E_SHIP_IN_THE_WAY;

   310

			return CMD_ERROR;

   311

		}

   312

   313

		if (ti.type == MP_WATER) {

   314

			if (ti.map5 > 1) goto not_valid_below;

   315

			m5 = 0xC8;

   316

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

   317

			if (direction == 0) {

   318

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

   319

			} else {

   320

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

   321

			}

   322

			m5 = 0xE0;

   323

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

   324

			if (direction == 0) {

   325

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

   326

			} else {

   327

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

   328

			}

   329

			m5 = 0xE8;

   330

		} else {

   331

not_valid_below:;

   332

			/* try and clear the middle landscape */

   333

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

   334

				return CMD_ERROR;

   335

			cost += ret;

   336

			m5 = 0xC0;

   337

		}

   338

   339

		/* do middle part of bridge */

   340

		if (flags & DC_EXEC) {

   341

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

   342

			SetTileType(ti.tile, MP_TUNNELBRIDGE);

   343

   344

			//bridges pieces sequence (middle parts)

   345

			// bridge len 1: 0

   346

			// bridge len 2: 0 1

   347

			// bridge len 3: 0 4 1

   348

			// bridge len 4: 0 2 3 1

   349

			// bridge len 5: 0 2 5 3 1

   350

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

   351

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

   352

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

   353

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

   354

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

   355

   356

			if(i==0)                    //first tile

   357

				m5 = 0;

   358

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

   359

				m5 = 1;

   360

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

   361

				m5 = 5 - (i%2);

   362

			else {

   363

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

   364

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

   365

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

   366

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

   367

			}

   368

   369

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

   370

			_map3_lo[ti.tile] &= 0xF;

   371

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

   372

   373

			MarkTileDirtyByTile(ti.tile);

   374

		}

   375

	}

   376

   377

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

   378

   379

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

   380

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

   381

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

   382

	*/

   383

	if (!(flags & DC_QUERY_COST)) {

   384

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

   385

   386

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

   387

			bridge_len = CalcBridgeLenCostFactor(bridge_len);

   388

   389

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

   390

	}

   391

   392

	return cost;

   393

}

   394

   395

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

   396

{

   397

	TileInfo ti;

   398

	int delta;

   399

   400

	delta = TileOffsByDir(dir);

   401

   402

	do {

   403

		tile -= delta;

   404

		FindLandscapeHeightByTile(&ti, tile);

   405

	} while (z < ti.z);

   406

   407

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

   408

		_error_message = STR_5003_ANOTHER_TUNNEL_IN_THE_WAY;

   409

		return false;

   410

	}

   411

   412

	return true;

   413

}

   414

   415

bool CheckTunnelInWay(uint tile, int z)

   416

{

   417

	return DoCheckTunnelInWay(tile,z,0) &&

   418

		DoCheckTunnelInWay(tile,z,1) &&

   419

		DoCheckTunnelInWay(tile,z,2) &&

   420

		DoCheckTunnelInWay(tile,z,3);

   421

}

   422

   423

static byte _build_tunnel_bh;

   424

static byte _build_tunnel_railtype;

   425

   426

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

   427

{

   428

	uint end_tile;

   429

	int direction;

   430

	int32 cost, ret;

   431

	TileInfo ti;

   432

	uint z;

   433

   434

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

   435

		return CMD_ERROR;

   436

   437

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

   438

	direction = 0;

   439

	if (x == x2) {

   440

		if (y == y2)

   441

			return_cmd_error(STR_5008_CANNOT_START_AND_END_ON);

   442

		direction++;

   443

		if (y > y2) {

   444

			intswap(y,y2);

   445

			intswap(x,x2);

   446

			exc_tile|=2;

   447

		}

   448

	} else if (y == y2) {

   449

		if (x > x2) {

   450

			intswap(y,y2);

   451

			intswap(x,x2);

   452

			exc_tile|=2;

   453

		}

   454

	} else

   455

		return_cmd_error(STR_500A_START_AND_END_MUST_BE_IN);

   456

   457

	cost = 0;

   458

   459

	FindLandscapeHeight(&ti, x2, y2);

   460

	end_tile = ti.tile;

   461

	z = ti.z;

   462

   463

	if (exc_tile != 3) {

   464

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

   465

			return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   466

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

   467

		if (ret == CMD_ERROR)

   468

			return CMD_ERROR;

   469

		cost += ret;

   470

	}

   471

	cost += _price.build_tunnel;

   472

   473

	for(;;) {

   474

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

   475

   476

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

   477

			break;

   478

   479

		FindLandscapeHeight(&ti, x2, y2);

   480

		if (ti.z <= z)

   481

			return_cmd_error(STR_5002);

   482

   483

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

   484

			return CMD_ERROR;

   485

   486

		cost += _price.build_tunnel;

   487

		cost += (cost >> 3);

   488

   489

		if (cost >= 400000000)

   490

			cost = 400000000;

   491

	}

   492

   493

	FindLandscapeHeight(&ti, x2, y2);

   494

	if (ti.z != z)

   495

		return_cmd_error(STR_5004);

   496

   497

	if (exc_tile != 1) {

   498

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

   499

			return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   500

   501

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

   502

		if (ret == CMD_ERROR)

   503

			return CMD_ERROR;

   504

		cost += ret;

   505

	}

   506

   507

	if (flags & DC_EXEC) {

   508

		ModifyTile(ti.tile,

   509

			MP_SETTYPE(MP_TUNNELBRIDGE) |

   510

			MP_MAP3LO | MP_MAPOWNER_CURRENT | MP_MAP5,

   511

			_build_tunnel_railtype, /* map3lo */

   512

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

   513

		);

   514

   515

		ModifyTile(end_tile,

   516

			MP_SETTYPE(MP_TUNNELBRIDGE) |

   517

			MP_MAP3LO | MP_MAPOWNER_CURRENT | MP_MAP5,

   518

			_build_tunnel_railtype, /* map3lo */

   519

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

   520

		);

   521

   522

		UpdateSignalsOnSegment(end_tile, direction?7:1);