1

/* $Id$ */

     2

     3

/** @file train_cmd.cpp */

     4

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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"

    13

#include "table/strings.h"

    14

#include "tunnel_map.h"

    15

#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"

    25

#include "depot.h"

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#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"

    32

#include "newgrf_sound.h"

    33

#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"

    47

    48

    49

static bool TrainCheckIfLineEnds(Vehicle *v);

    50

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

    51

    52

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

    53

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

    54

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

    55

    56

    57

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

    58

 * @param cargo Cargo type to get multiplier for

    59

 * @return Cargo weight multiplier

    60

 */

    61

byte FreightWagonMult(CargoID cargo)

    62

{

    63

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

    64

	return _patches.freight_trains;

    65

}

    66

    67

    68

/**

    69

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

    70

 * @param v First vehicle of the consist.

    71

 */

    72

void TrainPowerChanged(Vehicle* v)

    73

{

    74

	uint32 total_power = 0;

    75

	uint32 max_te = 0;

    76

    77

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

    78

		/* Power is not added for articulated parts */

    79

		if (IsArticulatedPart(u)) continue;

    80

    81

		RailType railtype = GetRailType(u->tile);

    82

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

    83

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

    84

    85

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

    86

    87

		if (engine_has_power) {

    88

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

    89

			if (power != 0) {

    90

				total_power += power;

    91

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

    92

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

    93

			}

    94

		}

    95

    96

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

    97

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

    98

		}

    99

	}

   100

   101

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

   102

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

   103

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

   104

   105

		v->u.rail.cached_power = total_power;

   106

		v->u.rail.cached_max_te = max_te;

   107

		InvalidateWindow(WC_VEHICLE_DETAILS, v->index);

   108

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

   109

	}

   110

}

   111

   112

   113

/**

   114

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

   115

 * the consist changes.

   116

 * @param v First vehicle of the consist.

   117

 */

   118

static void TrainCargoChanged(Vehicle* v)

   119

{

   120

	uint32 weight = 0;

   121

   122

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

   123

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

   124

   125

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

   126

		if (!IsArticulatedPart(u)) {

   127

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

   128

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

   129

   130

			/* powered wagons have extra weight added */

   131

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

   132

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

   133

		}

   134

   135

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

   136

		weight += vweight;

   137

   138

		/* store vehicle weight in cache */

   139

		u->u.rail.cached_veh_weight = vweight;

   140

	}

   141

   142

	/* store consist weight in cache */

   143

	v->u.rail.cached_weight = weight;

   144

   145

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

   146

	TrainPowerChanged(v);

   147

}

   148

   149

   150

/**

   151

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

   152

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

   153

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

   154

 * @param v First vehicle of the chain.

   155

 */

   156

void TrainConsistChanged(Vehicle* v)

   157

{

   158

	uint16 max_speed = 0xFFFF;

   159

   160

	assert(v->type == VEH_TRAIN);

   161

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

   162

   163

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

   164

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

   165

	v->u.rail.cached_total_length = 0;

   166

	v->u.rail.compatible_railtypes = 0;

   167

   168

	bool train_can_tilt = true;

   169

   170

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

   171

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

   172

   173

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

   174

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

   175

   176

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

   177

   178

		/* update the 'first engine' */

   179

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

   180

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

   181

   182

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

   183

   184

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

   185

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

   186

   187

		/* Reset color map */

   188

		u->colormap = PAL_NONE;

   189

   190

		if (rvi_u->visual_effect != 0) {

   191

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

   192

		} else {

   193

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

   194

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

   195

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

   196

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

   197

				/* Steam is offset by -4 units */

   198

				u->u.rail.cached_vis_effect = 4;

   199

			} else {

   200

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

   201

				u->u.rail.cached_vis_effect = 8;

   202

			}

   203

		}

   204

   205

		if (!IsArticulatedPart(u)) {

   206

			/* Check powered wagon / visual effect callback */

   207

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

   208

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

   209

   210

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

   211

			}

   212

   213

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

   214

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

   215

				/* wagon is powered */

   216

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

   217

			} else {

   218

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

   219

			}

   220

   221

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

   222

			   have railtype normal */

   223

			if (rvi_u->power > 0) {

   224

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

   225

			}

   226

   227

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

   228

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

   229

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

   230

				u->u.rail.railtype = RAILTYPE_RAIL;

   231

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

   232

			}

   233

   234

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

   235

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

   236

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

   237

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

   238

			}

   239

		}

   240

   241

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

   242

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

   243

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

   244

		}

   245

   246

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

   247

   248

		/* check the vehicle length (callback) */

   249

		uint16 veh_len = CALLBACK_FAILED;

   250

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

   251

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

   252

		}

   253

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

   254

		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

   255

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

   256

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

   257

	}

   258

   259

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

   260

	v->u.rail.cached_max_speed = max_speed;

   261

	v->u.rail.cached_tilt = train_can_tilt;

   262

   263

	/* 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) */

   264

	TrainCargoChanged(v);

   265

}

   266

   267

enum AccelType {

   268

	AM_ACCEL,

   269

	AM_BRAKE

   270

};

   271

   272

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

   273

{

   274

	const Order* o = &v->current_order;

   275

	StationID sid = GetStationIndex(tile);

   276

   277

	assert(v->type == VEH_TRAIN);

   278

	/* When does a train drive through a station

   279

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

   280

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

   281

		return false;

   282

	}

   283

   284

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

   285

   286

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

   287

		return false;

   288

	}

   289

   290

	return true;

   291

}

   292

   293

/** new acceleration*/

   294

static int GetTrainAcceleration(Vehicle *v, bool mode)

   295

{

   296

	static const int absolute_max_speed = 2000;

   297

	int max_speed = absolute_max_speed;

   298

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

   299

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

   300

   301

	/*first find the curve speed limit */

   302

	int numcurve = 0;

   303

	int sum = 0;

   304

	int pos = 0;

   305

	int lastpos = -1;

   306

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

   307

		Direction this_dir = u->direction;

   308

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

   309

   310

		DirDiff dirdiff = DirDifference(this_dir, next_dir);

   311

		if (dirdiff == DIRDIFF_SAME) continue;

   312

   313

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

   314

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

   315

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

   316

			if (lastpos != -1) {

   317

				numcurve++;

   318

				sum += pos - lastpos;

   319

				if (pos - lastpos == 1) {

   320

					max_speed = 88;

   321

				}

   322

			}

   323

			lastpos = pos;

   324

		}

   325

   326

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

   327

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

   328

			max_speed = 61;

   329

		}

   330

	}

   331

   332

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

   333

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

   334

   335

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

   336

			max_speed = absolute_max_speed;

   337

		} else if (total > 1) {

   338

			if (numcurve > 0) sum /= numcurve;

   339

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

   340

		}

   341

	}

   342

   343

	if (max_speed != absolute_max_speed) {

   344

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

   345

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

   346

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

   347

   348

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

   349

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

   350

			max_speed += max_speed / 5;

   351

		}

   352

	}

   353

   354

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

   355

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

   356

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

   357

   358

			int st_max_speed = 120;

   359

   360

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

   361

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

   362

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

   363

			}

   364

   365

			st_max_speed = max(st_max_speed, 25 * station_length);

   366

			max_speed = min(max_speed, st_max_speed);

   367

		}

   368

	}

   369

   370

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

   371

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

   372

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

   373

   374

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

   375

	int incl = 0;

   376

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

   377

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

   378

		num++;

   379

		drag_coeff += 3;

   380

   381

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

   382

   383

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

   384

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

   385

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

   386

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

   387

		}

   388

	}

   389

   390

	v->max_speed = max_speed;

   391

   392

	const int area = 120;

   393

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

   394

	int resistance;

   395

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

   396

		resistance = 13 * mass / 10;

   397

		resistance += 60 * num;

   398

		resistance += friction * mass * speed / 1000;

   399

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

   400

	} else {

   401

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

   402

	}

   403

	resistance += incl;

   404

	resistance *= 4; //[N]

   405

   406

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

   407

	 * actually double the train's power */

   408

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

   409

	int force;

   410

	if (speed > 2) {

   411

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

   412

			case RAILTYPE_RAIL:

   413

			case RAILTYPE_ELECTRIC:

   414

			case RAILTYPE_MONO:

   415

				force = power / speed; //[N]

   416

				force *= 22;

   417

				force /= 10;

   418

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

   419

				break;

   420

   421

			default: NOT_REACHED();

   422

			case RAILTYPE_MAGLEV:

   423

				force = power / 25;

   424

				break;

   425

		}

   426

	} else {

   427

		/* "kickoff" acceleration */

   428

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

   429

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

   430

	}

   431

   432

	if (force <= 0) force = 10000;

   433

   434

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

   435

   436

	if (mode == AM_ACCEL) {

   437

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

   438

	} else {

   439

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

   440

	}

   441

}

   442

   443

static void UpdateTrainAcceleration(Vehicle* v)

   444

{

   445

	assert(IsFrontEngine(v));

   446

   447

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

   448

   449

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

   450

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

   451

	assert(weight != 0);

   452

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

   453

}

   454

   455

int Train::GetImage(Direction direction) const

   456

{

   457

	int img = this->spritenum;

   458

	int base;

   459

   460

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

   461

   462

	if (is_custom_sprite(img)) {

   463

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

   464

		if (base != 0) return base;

   465

		img = orig_rail_vehicle_info[this->engine_type].image_index;

   466

	}

   467

   468

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

   469

   470

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

   471

	return base;

   472

}

   473

   474

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

   475

{

   476

	const RailVehicleInfo *rvi = RailVehInfo(engine);

   477

   478

	int img = rvi->image_index;

   479

	SpriteID image = 0;

   480