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/* $Id$ */

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/** @file train_cmd.cpp */

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#include "stdafx.h"

     6

#include "openttd.h"

     7

#include "bridge_map.h"

     8

#include "debug.h"

     9

#include "tile_cmd.h"

    10

#include "landscape.h"

    11

#include "gui.h"

    12

#include "station_map.h"

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#include "table/strings.h"

    14

#include "tunnel_map.h"

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#include "timetable.h"

    16

#include "articulated_vehicles.h"

    17

#include "command_func.h"

    18

#include "pathfind.h"

    19

#include "npf.h"

    20

#include "station.h"

    21

#include "table/train_cmd.h"

    22

#include "news.h"

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#include "engine.h"

    24

#include "player.h"

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#include "depot.h"

    26

#include "waypoint.h"

    27

#include "vehicle_gui.h"

    28

#include "train.h"

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#include "bridge.h"

    30

#include "newgrf_callbacks.h"

    31

#include "newgrf_engine.h"

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#include "newgrf_sound.h"

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#include "newgrf_text.h"

    34

#include "direction_func.h"

    35

#include "yapf/yapf.h"

    36

#include "cargotype.h"

    37

#include "group.h"

    38

#include "table/sprites.h"

    39

#include "tunnelbridge_map.h"

    40

#include "strings_func.h"

    41

#include "functions.h"

    42

#include "window_func.h"

    43

#include "date_func.h"

    44

#include "vehicle_func.h"

    45

#include "sound_func.h"

    46

#include "variables.h"

    47

#include "autoreplace_gui.h"

    48

#include "gfx_func.h"

    49

    50

    51

static bool TrainCheckIfLineEnds(Vehicle *v);

    52

static void TrainController(Vehicle *v, bool update_image);

    53

    54

static const byte _vehicle_initial_x_fract[4] = {10, 8, 4,  8};

    55

static const byte _vehicle_initial_y_fract[4] = { 8, 4, 8, 10};

    56

static const TrackBits _state_dir_table[4] = { TRACK_BIT_RIGHT, TRACK_BIT_LOWER, TRACK_BIT_LEFT, TRACK_BIT_UPPER };

    57

    58

    59

/** Return the cargo weight multiplier to use for a rail vehicle

    60

 * @param cargo Cargo type to get multiplier for

    61

 * @return Cargo weight multiplier

    62

 */

    63

byte FreightWagonMult(CargoID cargo)

    64

{

    65

	if (!GetCargo(cargo)->is_freight) return 1;

    66

	return _patches.freight_trains;

    67

}

    68

    69

    70

/**

    71

 * Recalculates the cached total power of a train. Should be called when the consist is changed

    72

 * @param v First vehicle of the consist.

    73

 */

    74

void TrainPowerChanged(Vehicle* v)

    75

{

    76

	uint32 total_power = 0;

    77

	uint32 max_te = 0;

    78

    79

	for (const Vehicle *u = v; u != NULL; u = u->Next()) {

    80

		/* Power is not added for articulated parts */

    81

		if (IsArticulatedPart(u)) continue;

    82

    83

		RailType railtype = GetRailType(u->tile);

    84

		bool engine_has_power = HasPowerOnRail(u->u.rail.railtype, railtype);

    85

		bool wagon_has_power  = HasPowerOnRail(v->u.rail.railtype, railtype);

    86

    87

		const RailVehicleInfo *rvi_u = RailVehInfo(u->engine_type);

    88

    89

		if (engine_has_power) {

    90

			uint16 power = GetVehicleProperty(u, 0x0B, rvi_u->power);

    91

			if (power != 0) {

    92

				total_power += power;

    93

				/* Tractive effort in (tonnes * 1000 * 10 =) N */

    94

				max_te += (u->u.rail.cached_veh_weight * 10000 * GetVehicleProperty(u, 0x1F, rvi_u->tractive_effort)) / 256;

    95

			}

    96

		}

    97

    98

		if (HasBit(u->u.rail.flags, VRF_POWEREDWAGON) && (wagon_has_power)) {

    99

			total_power += RailVehInfo(u->u.rail.first_engine)->pow_wag_power;

   100

		}

   101

	}

   102

   103

	if (v->u.rail.cached_power != total_power || v->u.rail.cached_max_te != max_te) {

   104

		/* If it has no power (no catenary), stop the train */

   105

		if (total_power == 0) v->vehstatus |= VS_STOPPED;

   106

   107

		v->u.rail.cached_power = total_power;

   108

		v->u.rail.cached_max_te = max_te;

   109

		InvalidateWindow(WC_VEHICLE_DETAILS, v->index);

   110

		InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, STATUS_BAR);

   111

	}

   112

}

   113

   114

   115

/**

   116

 * Recalculates the cached weight of a train and its vehicles. Should be called each time the cargo on

   117

 * the consist changes.

   118

 * @param v First vehicle of the consist.

   119

 */

   120

static void TrainCargoChanged(Vehicle* v)

   121

{

   122

	uint32 weight = 0;

   123

   124

	for (Vehicle *u = v; u != NULL; u = u->Next()) {

   125

		uint32 vweight = GetCargo(u->cargo_type)->weight * u->cargo.Count() * FreightWagonMult(u->cargo_type) / 16;

   126

   127

		/* Vehicle weight is not added for articulated parts. */

   128

		if (!IsArticulatedPart(u)) {

   129

			/* vehicle weight is the sum of the weight of the vehicle and the weight of its cargo */

   130

			vweight += GetVehicleProperty(u, 0x16, RailVehInfo(u->engine_type)->weight);

   131

   132

			/* powered wagons have extra weight added */

   133

			if (HasBit(u->u.rail.flags, VRF_POWEREDWAGON))

   134

				vweight += RailVehInfo(u->u.rail.first_engine)->pow_wag_weight;

   135

		}

   136

   137

		/* consist weight is the sum of the weight of all vehicles in the consist */

   138

		weight += vweight;

   139

   140

		/* store vehicle weight in cache */

   141

		u->u.rail.cached_veh_weight = vweight;

   142

	}

   143

   144

	/* store consist weight in cache */

   145

	v->u.rail.cached_weight = weight;

   146

   147

	/* Now update train power (tractive effort is dependent on weight) */

   148

	TrainPowerChanged(v);

   149

}

   150

   151

   152

/**

   153

 * Recalculates the cached stuff of a train. Should be called each time a vehicle is added

   154

 * to/removed from the chain, and when the game is loaded.

   155

 * Note: this needs to be called too for 'wagon chains' (in the depot, without an engine)

   156

 * @param v First vehicle of the chain.

   157

 */

   158

void TrainConsistChanged(Vehicle* v)

   159

{

   160

	uint16 max_speed = 0xFFFF;

   161

   162

	assert(v->type == VEH_TRAIN);

   163

	assert(IsFrontEngine(v) || IsFreeWagon(v));

   164

   165

	const RailVehicleInfo *rvi_v = RailVehInfo(v->engine_type);

   166

	EngineID first_engine = IsFrontEngine(v) ? v->engine_type : INVALID_ENGINE;

   167

	v->u.rail.cached_total_length = 0;

   168

	v->u.rail.compatible_railtypes = 0;

   169

   170

	bool train_can_tilt = true;

   171

   172

	for (Vehicle *u = v; u != NULL; u = u->Next()) {

   173

		const RailVehicleInfo *rvi_u = RailVehInfo(u->engine_type);

   174

   175

		/* Check the v->first cache. */

   176

		assert(u->First() == v);

   177

   178

		if (!HasBit(EngInfo(u->engine_type)->misc_flags, EF_RAIL_TILTS)) train_can_tilt = false;

   179

   180

		/* update the 'first engine' */

   181

		u->u.rail.first_engine = v == u ? INVALID_ENGINE : first_engine;

   182

		u->u.rail.railtype = rvi_u->railtype;

   183

   184

		if (IsTrainEngine(u)) first_engine = u->engine_type;

   185

   186

		/* Cache wagon override sprite group. NULL is returned if there is none */

   187

		u->u.rail.cached_override = GetWagonOverrideSpriteSet(u->engine_type, u->cargo_type, u->u.rail.first_engine);

   188

   189

		/* Reset color map */

   190

		u->colormap = PAL_NONE;

   191

   192

		if (rvi_u->visual_effect != 0) {

   193

			u->u.rail.cached_vis_effect = rvi_u->visual_effect;

   194

		} else {

   195

			if (IsTrainWagon(u) || IsArticulatedPart(u)) {

   196

				/* Wagons and articulated parts have no effect by default */

   197

				u->u.rail.cached_vis_effect = 0x40;

   198

			} else if (rvi_u->engclass == 0) {

   199

				/* Steam is offset by -4 units */

   200

				u->u.rail.cached_vis_effect = 4;

   201

			} else {

   202

				/* Diesel fumes and sparks come from the centre */

   203

				u->u.rail.cached_vis_effect = 8;

   204

			}

   205

		}

   206

   207

		if (!IsArticulatedPart(u)) {

   208

			/* Check powered wagon / visual effect callback */

   209

			if (HasBit(EngInfo(u->engine_type)->callbackmask, CBM_TRAIN_WAGON_POWER)) {

   210

				uint16 callback = GetVehicleCallback(CBID_TRAIN_WAGON_POWER, 0, 0, u->engine_type, u);

   211

   212

				if (callback != CALLBACK_FAILED) u->u.rail.cached_vis_effect = callback;

   213

			}

   214

   215

			if (rvi_v->pow_wag_power != 0 && rvi_u->railveh_type == RAILVEH_WAGON &&

   216

				UsesWagonOverride(u) && !HasBit(u->u.rail.cached_vis_effect, 7)) {

   217

				/* wagon is powered */

   218

				SetBit(u->u.rail.flags, VRF_POWEREDWAGON); // cache 'powered' status

   219

			} else {

   220

				ClrBit(u->u.rail.flags, VRF_POWEREDWAGON);

   221

			}

   222

   223

			/* Do not count powered wagons for the compatible railtypes, as wagons always

   224

			   have railtype normal */

   225

			if (rvi_u->power > 0) {

   226

				v->u.rail.compatible_railtypes |= GetRailTypeInfo(u->u.rail.railtype)->powered_railtypes;

   227

			}

   228

   229

			/* Some electric engines can be allowed to run on normal rail. It happens to all

   230

			 * existing electric engines when elrails are disabled and then re-enabled */

   231

			if (HasBit(u->u.rail.flags, VRF_EL_ENGINE_ALLOWED_NORMAL_RAIL)) {

   232

				u->u.rail.railtype = RAILTYPE_RAIL;

   233

				u->u.rail.compatible_railtypes |= (1 << RAILTYPE_RAIL);

   234

			}

   235

   236

			/* max speed is the minimum of the speed limits of all vehicles in the consist */

   237

			if ((rvi_u->railveh_type != RAILVEH_WAGON || _patches.wagon_speed_limits) && !UsesWagonOverride(u)) {

   238

				uint16 speed = GetVehicleProperty(u, 0x09, rvi_u->max_speed);

   239

				if (speed != 0) max_speed = min(speed, max_speed);

   240

			}

   241

		}

   242

   243

		if (u->cargo_type == rvi_u->cargo_type && u->cargo_subtype == 0) {

   244

			/* Set cargo capacity if we've not been refitted */

   245

			u->cargo_cap = GetVehicleProperty(u, 0x14, rvi_u->capacity);

   246

		}

   247

   248

		u->u.rail.user_def_data = GetVehicleProperty(u, 0x25, rvi_u->user_def_data);

   249

   250

		/* check the vehicle length (callback) */

   251

		uint16 veh_len = CALLBACK_FAILED;

   252

		if (HasBit(EngInfo(u->engine_type)->callbackmask, CBM_VEHICLE_LENGTH)) {

   253

			veh_len = GetVehicleCallback(CBID_VEHICLE_LENGTH, 0, 0, u->engine_type, u);

   254

		}

   255

		if (veh_len == CALLBACK_FAILED) veh_len = rvi_u->shorten_factor;

   256

		veh_len = Clamp(veh_len, 0, u->Next() == NULL ? 7 : 5); // the clamp on vehicles not the last in chain is stricter, as too short wagons can break the 'follow next vehicle' code

   257

		u->u.rail.cached_veh_length = 8 - veh_len;

   258

		v->u.rail.cached_total_length += u->u.rail.cached_veh_length;

   259

	}

   260

   261

	/* store consist weight/max speed in cache */

   262

	v->u.rail.cached_max_speed = max_speed;

   263

	v->u.rail.cached_tilt = train_can_tilt;

   264

   265

	/* recalculate cached weights and power too (we do this *after* the rest, so it is known which wagons are powered and need extra weight added) */

   266

	TrainCargoChanged(v);

   267

}

   268

   269

enum AccelType {

   270

	AM_ACCEL,

   271

	AM_BRAKE

   272

};

   273

   274

static bool TrainShouldStop(const Vehicle* v, TileIndex tile)

   275

{

   276

	const Order* o = &v->current_order;

   277

	StationID sid = GetStationIndex(tile);

   278

   279

	assert(v->type == VEH_TRAIN);

   280

	/* When does a train drive through a station

   281

	 * first we deal with the "new nonstop handling" */

   282

	if (_patches.new_nonstop && o->flags & OF_NON_STOP && sid == o->dest) {

   283

		return false;

   284

	}

   285

   286

	if (v->last_station_visited == sid) return false;

   287

   288

	if (sid != o->dest && (o->flags & OF_NON_STOP || _patches.new_nonstop)) {

   289

		return false;

   290

	}

   291

   292

	return true;

   293

}

   294

   295

/** new acceleration*/

   296

static int GetTrainAcceleration(Vehicle *v, bool mode)

   297

{

   298

	static const int absolute_max_speed = 2000;

   299

	int max_speed = absolute_max_speed;

   300

	int speed = v->cur_speed * 10 / 16; // km-ish/h -> mp/h

   301

	int curvecount[2] = {0, 0};

   302

   303

	/*first find the curve speed limit */

   304

	int numcurve = 0;

   305

	int sum = 0;

   306

	int pos = 0;

   307

	int lastpos = -1;

   308

	for (const Vehicle *u = v; u->Next() != NULL; u = u->Next(), pos++) {

   309

		Direction this_dir = u->direction;

   310

		Direction next_dir = u->Next()->direction;

   311

   312

		DirDiff dirdiff = DirDifference(this_dir, next_dir);

   313

		if (dirdiff == DIRDIFF_SAME) continue;

   314

   315

		if (dirdiff == DIRDIFF_45LEFT) curvecount[0]++;

   316

		if (dirdiff == DIRDIFF_45RIGHT) curvecount[1]++;

   317

		if (dirdiff == DIRDIFF_45LEFT || dirdiff == DIRDIFF_45RIGHT) {

   318

			if (lastpos != -1) {

   319

				numcurve++;

   320

				sum += pos - lastpos;

   321

				if (pos - lastpos == 1) {

   322

					max_speed = 88;

   323

				}

   324

			}

   325

			lastpos = pos;

   326

		}

   327

   328

		/*if we have a 90 degree turn, fix the speed limit to 60 */

   329

		if (dirdiff == DIRDIFF_90LEFT || dirdiff == DIRDIFF_90RIGHT) {

   330

			max_speed = 61;

   331

		}

   332

	}

   333

   334

	if ((curvecount[0] != 0 || curvecount[1] != 0) && max_speed > 88) {

   335

		int total = curvecount[0] + curvecount[1];

   336

   337

		if (curvecount[0] == 1 && curvecount[1] == 1) {

   338

			max_speed = absolute_max_speed;

   339

		} else if (total > 1) {

   340

			if (numcurve > 0) sum /= numcurve;

   341

			max_speed = 232 - (13 - Clamp(sum, 1, 12)) * (13 - Clamp(sum, 1, 12));

   342

		}

   343

	}

   344

   345

	if (max_speed != absolute_max_speed) {

   346

		/* Apply the engine's rail type curve speed advantage, if it slowed by curves */

   347

		const RailtypeInfo *rti = GetRailTypeInfo(v->u.rail.railtype);

   348

		max_speed += (max_speed / 2) * rti->curve_speed;

   349

   350

		if (v->u.rail.cached_tilt) {

   351

			/* Apply max_speed bonus of 20% for a tilting train */

   352

			max_speed += max_speed / 5;

   353

		}

   354

	}

   355

   356

	if (IsTileType(v->tile, MP_STATION) && IsFrontEngine(v)) {

   357

		if (TrainShouldStop(v, v->tile)) {

   358

			int station_length = GetStationByTile(v->tile)->GetPlatformLength(v->tile, DirToDiagDir(v->direction));

   359

   360

			int st_max_speed = 120;

   361

   362

			int delta_v = v->cur_speed / (station_length + 1);

   363

			if (v->max_speed > (v->cur_speed - delta_v)) {

   364

				st_max_speed = v->cur_speed - (delta_v / 10);

   365

			}

   366

   367

			st_max_speed = max(st_max_speed, 25 * station_length);

   368

			max_speed = min(max_speed, st_max_speed);

   369

		}

   370

	}

   371

   372

	int mass = v->u.rail.cached_weight;

   373

	int power = v->u.rail.cached_power * 746;

   374

	max_speed = min(max_speed, v->u.rail.cached_max_speed);

   375

   376

	int num = 0; //number of vehicles, change this into the number of axles later

   377

	int incl = 0;

   378

	int drag_coeff = 20; //[1e-4]

   379

	for (const Vehicle *u = v; u != NULL; u = u->Next()) {

   380

		num++;

   381

		drag_coeff += 3;

   382

   383

		if (u->u.rail.track == TRACK_BIT_DEPOT) max_speed = min(max_speed, 61);

   384

   385

		if (HasBit(u->u.rail.flags, VRF_GOINGUP)) {

   386

			incl += u->u.rail.cached_veh_weight * 60; //3% slope, quite a bit actually

   387

		} else if (HasBit(u->u.rail.flags, VRF_GOINGDOWN)) {

   388

			incl -= u->u.rail.cached_veh_weight * 60;

   389

		}

   390

	}

   391

   392

	v->max_speed = max_speed;

   393

   394

	const int area = 120;

   395

	const int friction = 35; //[1e-3]

   396

	int resistance;

   397

	if (v->u.rail.railtype != RAILTYPE_MAGLEV) {

   398

		resistance = 13 * mass / 10;

   399

		resistance += 60 * num;

   400

		resistance += friction * mass * speed / 1000;

   401

		resistance += (area * drag_coeff * speed * speed) / 10000;

   402

	} else {

   403

		resistance = (area * (drag_coeff / 2) * speed * speed) / 10000;

   404

	}

   405

	resistance += incl;

   406

	resistance *= 4; //[N]

   407

   408

	/* Due to the mph to m/s conversion below, at speeds below 3 mph the force is

   409

	 * actually double the train's power */

   410

	const int max_te = v->u.rail.cached_max_te; // [N]

   411

	int force;

   412

	if (speed > 2) {

   413

		switch (v->u.rail.railtype) {

   414

			case RAILTYPE_RAIL:

   415

			case RAILTYPE_ELECTRIC:

   416

			case RAILTYPE_MONO:

   417

				force = power / speed; //[N]

   418

				force *= 22;

   419

				force /= 10;

   420

				if (mode == AM_ACCEL && force > max_te) force = max_te;

   421

				break;

   422

   423

			default: NOT_REACHED();

   424

			case RAILTYPE_MAGLEV:

   425

				force = power / 25;

   426

				break;

   427

		}

   428

	} else {

   429

		/* "kickoff" acceleration */

   430

		force = (mode == AM_ACCEL && v->u.rail.railtype != RAILTYPE_MAGLEV) ? min(max_te, power) : power;

   431

		force = max(force, (mass * 8) + resistance);

   432

	}

   433

   434

	if (force <= 0) force = 10000;

   435

   436

	if (v->u.rail.railtype != RAILTYPE_MAGLEV) force = min(force, mass * 10 * 200);

   437

   438

	if (mode == AM_ACCEL) {

   439

		return (force - resistance) / (mass * 4);

   440

	} else {

   441

		return min((-force - resistance) / (mass * 4), -10000 / (mass * 4));

   442

	}

   443

}

   444

   445

static void UpdateTrainAcceleration(Vehicle* v)

   446

{

   447

	assert(IsFrontEngine(v));

   448

   449

	v->max_speed = v->u.rail.cached_max_speed;

   450

   451

	uint power = v->u.rail.cached_power;

   452

	uint weight = v->u.rail.cached_weight;

   453

	assert(weight != 0);

   454

	v->acceleration = Clamp(power / weight * 4, 1, 255);

   455

}

   456

   457

int Train::GetImage(Direction direction) const

   458

{

   459

	int img = this->spritenum;

   460

	int base;

   461

   462

	if (HasBit(this->u.rail.flags, VRF_REVERSE_DIRECTION)) direction = ReverseDir(direction);

   463

   464

	if (is_custom_sprite(img)) {

   465

		base = GetCustomVehicleSprite(this, (Direction)(direction + 4 * IS_CUSTOM_SECONDHEAD_SPRITE(img)));

   466

		if (base != 0) return base;

   468

	}

   469

   470

	base = _engine_sprite_base[img] + ((direction + _engine_sprite_add[img]) & _engine_sprite_and[img]);

   471

   472

	if (this->cargo.Count() >= this->cargo_cap / 2U) base += _wagon_full_adder[img];

   473

	return base;

   474

}

   475

   476

void DrawTrainEngine(int x, int y, EngineID engine, SpriteID pal)

   477

{

   478

	const RailVehicleInfo *rvi = RailVehInfo(engine);

   479

   480