1

#include "stdafx.h"

     2

#include "ttd.h"

     3

#include "table/sprites.h"

     4

#include "table/strings.h"

     5

#include "map.h"

     6

#include "tile.h"

     7

#include "vehicle.h"

     8

#include "viewport.h"

     9

#include "command.h"

    10

#include "player.h"

    11

#include "town.h"

    12

#include "sound.h"

    13

    14

extern void DrawCanalWater(uint tile);

    15

    16

static const byte _bridge_available_year[MAX_BRIDGES] = {

    17

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

    18

};

    19

    20

static const byte _bridge_minlen[MAX_BRIDGES] = {

    21

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

    22

};

    23

    24

static const byte _bridge_maxlen[MAX_BRIDGES] = {

    25

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

    26

};

    27

    28

const uint16 _bridge_type_price_mod[MAX_BRIDGES] = {

    29

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

    30

};

    31

    32

const uint16 _bridge_speeds[MAX_BRIDGES] = {

    33

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

    34

};

    35

    36

const PalSpriteID _bridge_sprites[MAX_BRIDGES] = {

    37

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

    38

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

    39

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

    40

	0x3238A28,

    41

};

    42

    43

const StringID _bridge_material[MAX_BRIDGES] = {

    44

	STR_5012_WOODEN,

    45

	STR_5013_CONCRETE,

    46

	STR_500F_GIRDER_STEEL,

    47

	STR_5011_SUSPENSION_CONCRETE,

    48

	STR_500E_SUSPENSION_STEEL,

    49

	STR_500E_SUSPENSION_STEEL,

    50

	STR_5010_CANTILEVER_STEEL,

    51

	STR_5010_CANTILEVER_STEEL,

    52

	STR_5010_CANTILEVER_STEEL,

    53

	STR_500F_GIRDER_STEEL,

    54

	STR_5014_TUBULAR_STEEL,

    55

	STR_5014_TUBULAR_STEEL,

    56

	STR_BRIDGE_TUBULAR_SILICON,

    57

};

    58

    59

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

    60

// 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,

    61

int CalcBridgeLenCostFactor(int x)

    62

{

    63

	int n,r;

    64

	if (x < 2) return x;

    65

	x -= 2;

    66

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

    67

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

    68

		r += n * n;

    69

		x -= n;

    70

	}

    71

}

    72

    73

enum {

    74

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

    75

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

    76

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

    77

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

    78

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

    79

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

    80

};

    81

    82

/*	check if bridge can be built on slope

    83

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

    84

 *	is_start_tile = false		<-- end tile

    85

 *	is_start_tile = true		<-- start tile

    86

 */

    87

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

    88

{

    89

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

    90

    91

		if (is_start_tile) {

    92

			/* check slope at start tile

    93

					- no extra cost

    94

					- direction X: tiles 0,12

    95

					- direction Y: tiles 0, 9

    96

			*/

    97

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

    98

				return 0;

    99

   100

			// disallow certain start tiles to avoid certain crooked bridges

   101

			if (tileh == 2)

   102

				return CMD_ERROR;

   103

   104

		}

   105

		else {

   106

			/*	check slope at end tile

   107

					- no extra cost

   108

					- direction X: tiles 0, 3

   109

					- direction Y: tiles 0, 6

   110

			*/

   111

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

   112

				return 0;

   113

   114

			// disallow certain end tiles to avoid certain crooked bridges

   115

			if (tileh == 8)

   116

				return CMD_ERROR;

   117

   118

		}

   119

   120

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

   121

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

   122

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

   123

		 */

   124

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

   125

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

   126

			return CMD_ERROR;

   127

   128

		// slope foundations

   129

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

   130

			return _price.terraform;

   131

	}

   132

   133

	return CMD_ERROR;

   134

}

   135

   136

uint32 GetBridgeLength(TileIndex begin, TileIndex end)

   137

{

   138

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

   139

	x1 = TileX(begin);

   140

	y1 = TileY(begin);

   141

	x2 = TileX(end);

   142

	y2 = TileY(end);

   143

   144

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

   145

}

   146

   147

bool CheckBridge_Stuff(byte bridge_type, int bridge_len)

   148

{

   149

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

   150

   151

	if (_bridge_available_year[bridge_type] > _cur_year)

   152

				return false;

   153

   154

	max = _bridge_maxlen[bridge_type];

   155

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

   156

		max = 100;

   157

   158

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

   159

		return false;

   160

   161

	return true;

   162

}

   163

   164

/* Build a Bridge

   165

 * x,y - end tile coord

   166

 * p1  - packed start tile coords (~ dx)

   167

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

   168

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

   169

 */

   170

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

   171

{

   172

	int bridge_type;

   173

	byte rail_or_road, railtype, m5;

   174

	int sx,sy;

   175

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

   176

	int bridge_len, odd_middle_part;

   177

	uint direction;

   178

	int i;

   179

	int32 cost, terraformcost, ret;

   180

   181

	SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);

   182

   183

	/* unpack parameters */

   184

	bridge_type = p2 & 0xFF;

   185

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

   186

   187

	// type of bridge

   188

	if (railtype & 0x80) {

   189

		railtype = 0;

   190

		rail_or_road = 2;

   191

	} else {

   192

		rail_or_road = 0;

   193

	}

   194

   195

	sx = TileX(p1) * 16;

   196

	sy = TileY(p1) * 16;

   197

   198

	direction = 0;

   199

   200

	if (bridge_type >= MAX_BRIDGES) // out of bounds bridge

   201

		return_cmd_error(STR_5015_CAN_T_BUILD_BRIDGE_HERE);

   202

   203

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

   204

	if (x == sx) {

   205

		if (y == sy)

   206

			return_cmd_error(STR_5008_CANNOT_START_AND_END_ON);

   207

		direction = 1;

   208

		if (y > sy) {

   209

			intswap(y,sy);

   210

			intswap(x,sx);

   211

		}

   212

	} else if (y == sy) {

   213

		if (x > sx) {

   214

			intswap(y,sy);

   215

			intswap(x,sx);

   216

		}

   217

	} else

   218

		return_cmd_error(STR_500A_START_AND_END_MUST_BE_IN);

   219

   220

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

   221

	if (

   222

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

   223

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

   224

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

   225

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

   226

		return_cmd_error(STR_02A0_ENDS_OF_BRIDGE_MUST_BOTH);

   227

   228

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

   229

		ti_start.z += 8;

   230

		ti_start.tileh = 0;

   231

	}

   232

   233

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

   234

		ti_end.z += 8;

   235

		ti_end.tileh = 0;

   236

	}

   237

   238

	if (ti_start.z != ti_end.z)

   239

		return_cmd_error(STR_5009_LEVEL_LAND_OR_WATER_REQUIRED);

   240

   241

	_error_message = STR_500C;

   242

   243

	/* try and clear the start landscape */

   244

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

   245

		return CMD_ERROR;

   246

	cost = ret;

   247

   248

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

   249

   250

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

   251

	if (terraformcost == CMD_ERROR ||

   252

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

   253

		return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   254

   255

	cost += terraformcost;

   256

   257

	/* try and clear the end landscape */

   258

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

   259

		return CMD_ERROR;

   260

	cost += ret;

   261

   262

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

   263

   264

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

   265

	if (terraformcost == CMD_ERROR ||

   266

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

   267

		return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   268

   269

	cost += terraformcost;

   270

   271

	/* do the drill? */

   272

	if (flags & DC_EXEC) {

   273

		/* build the start tile */

   274

		ModifyTile(ti_start.tile,

   275

			MP_SETTYPE(MP_TUNNELBRIDGE) |

   276

			MP_MAP2 | MP_MAP3LO | MP_MAPOWNER_CURRENT | MP_MAP5,

   277

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

   278

			railtype, /* map3_lo */

   279

			0x80 | direction | rail_or_road /* map5 */

   280

		);

   281

   282

		/* build the end tile */

   283

		ModifyTile(ti_end.tile,

   284

			MP_SETTYPE(MP_TUNNELBRIDGE) |

   285

			MP_MAP2 | MP_MAP3LO | MP_MAPOWNER_CURRENT | MP_MAP5,

   286

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

   287

			railtype, /* map3_lo */

   288

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

   289

		);

   290

	}

   291

   292

	/* set various params */

   293

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

   294

   295

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

   296

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

   297

   298

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

   299

		if (direction != 0)

   300

			y+=16;

   301

		else

   302

			x+=16;

   303

   304

		FindLandscapeHeight(&ti, x, y);

   305

   306

		_error_message = STR_5009_LEVEL_LAND_OR_WATER_REQUIRED;

   307

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

   308

			return CMD_ERROR;

   309

   310

		// Find ship below

   311

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

   312

		{

   313

			_error_message = STR_980E_SHIP_IN_THE_WAY;

   314

			return CMD_ERROR;

   315

		}

   316

   317

		if (ti.type == MP_WATER) {

   318

			if (ti.map5 > 1) goto not_valid_below;

   319

			m5 = 0xC8;

   320

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

   321

			if (direction == 0) {

   322

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

   323

			} else {

   324

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

   325

			}

   326

			m5 = 0xE0;

   327

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

   328

			if (direction == 0) {

   329

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

   330

			} else {

   331

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

   332

			}

   333

			m5 = 0xE8;

   334

		} else {

   335

not_valid_below:;

   336

			/* try and clear the middle landscape */

   337

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

   338

				return CMD_ERROR;

   339

			cost += ret;

   340

			m5 = 0xC0;

   341

		}

   342

   343

		/* do middle part of bridge */

   344

		if (flags & DC_EXEC) {

   345

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

   346

			SetTileType(ti.tile, MP_TUNNELBRIDGE);

   347

   348

			//bridges pieces sequence (middle parts)

   349

			// bridge len 1: 0

   350

			// bridge len 2: 0 1

   351

			// bridge len 3: 0 4 1

   352

			// bridge len 4: 0 2 3 1

   353

			// bridge len 5: 0 2 5 3 1

   354

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

   355

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

   356

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

   357

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

   358

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

   359

   360

			if(i==0)                    //first tile

   361

				m5 = 0;

   362

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

   363

				m5 = 1;

   364

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

   365

				m5 = 5 - (i%2);

   366

			else {

   367

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

   368

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

   369

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

   370

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

   371

			}

   372

   373

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

   374

			_map3_lo[ti.tile] &= 0xF;

   375

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

   376

   377

			MarkTileDirtyByTile(ti.tile);

   378

		}

   379

	}

   380

   381

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

   382

   383

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

   384

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

   385

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

   386

	*/

   387

	if (!(flags & DC_QUERY_COST)) {

   388

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

   389

   390

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

   391

			bridge_len = CalcBridgeLenCostFactor(bridge_len);

   392

   393

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

   394

	}

   395

   396

	return cost;

   397

}

   398

   399

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

   400

{

   401

	TileInfo ti;

   402

	int delta;

   403

   404

	delta = TileOffsByDir(dir);

   405

   406

	do {

   407

		tile -= delta;

   408

		FindLandscapeHeightByTile(&ti, tile);

   409

	} while (z < ti.z);

   410

   411

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

   412

		_error_message = STR_5003_ANOTHER_TUNNEL_IN_THE_WAY;

   413

		return false;

   414

	}

   415

   416

	return true;

   417

}

   418

   419

bool CheckTunnelInWay(uint tile, int z)

   420

{

   421

	return DoCheckTunnelInWay(tile,z,0) &&

   422

		DoCheckTunnelInWay(tile,z,1) &&

   423

		DoCheckTunnelInWay(tile,z,2) &&

   424

		DoCheckTunnelInWay(tile,z,3);

   425

}

   426

   427

static byte _build_tunnel_bh;

   428

static byte _build_tunnel_railtype;

   429

   430

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

   431

{

   432

	uint end_tile;

   433

	int direction;

   434

	int32 cost, ret;

   435

	TileInfo ti;

   436

	uint z;

   437

   438

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

   439

		return CMD_ERROR;

   440

   441

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

   442

	direction = 0;

   443

	if (x == x2) {

   444

		if (y == y2)

   445

			return_cmd_error(STR_5008_CANNOT_START_AND_END_ON);

   446

		direction++;

   447

		if (y > y2) {

   448

			intswap(y,y2);

   449

			intswap(x,x2);

   450

			exc_tile|=2;

   451

		}

   452

	} else if (y == y2) {

   453

		if (x > x2) {

   454

			intswap(y,y2);

   455

			intswap(x,x2);

   456

			exc_tile|=2;

   457

		}

   458

	} else

   459

		return_cmd_error(STR_500A_START_AND_END_MUST_BE_IN);

   460

   461

	cost = 0;

   462

   463

	FindLandscapeHeight(&ti, x2, y2);

   464

	end_tile = ti.tile;

   465

	z = ti.z;

   466

   467

	if (exc_tile != 3) {

   468

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

   469

			return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   470

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

   471

		if (ret == CMD_ERROR)

   472

			return CMD_ERROR;

   473

		cost += ret;

   474

	}

   475

	cost += _price.build_tunnel;

   476

   477

	for(;;) {

   478

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

   479

   480

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

   481

			break;

   482

   483

		FindLandscapeHeight(&ti, x2, y2);

   484

		if (ti.z <= z)

   485

			return_cmd_error(STR_5002);

   486

   487

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

   488

			return CMD_ERROR;

   489

   490

		cost += _price.build_tunnel;

   491

		cost += (cost >> 3);

   492

   493

		if (cost >= 400000000)

   494

			cost = 400000000;

   495

	}

   496

   497

	FindLandscapeHeight(&ti, x2, y2);

   498

	if (ti.z != z)

   499

		return_cmd_error(STR_5004);

   500

   501

	if (exc_tile != 1) {

   502

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

   503

			return_cmd_error(STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION);

   504

   505

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

   506

		if (ret == CMD_ERROR)

   507

			return CMD_ERROR;

   508

		cost += ret;

   509

	}

   510

   511

	if (flags & DC_EXEC) {

   512

		ModifyTile(ti.tile,

   513

			MP_SETTYPE(MP_TUNNELBRIDGE) |

   514

			MP_MAP3LO | MP_MAPOWNER_CURRENT | MP_MAP5,

   515

			_build_tunnel_railtype, /* map3lo */

   516

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

   517

		);

   518

   519

		ModifyTile(end_tile,

   520

			MP_SETTYPE(MP_TUNNELBRIDGE) |

   521

			MP_MAP3LO | MP_MAPOWNER_CURRENT | MP_MAP5,

   522

			_build_tunnel_railtype, /* map3lo */