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/* $Id$ */

     2

     3

/** @file train_cmd.cpp */

     4

     5

#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 "map.h"

    15

#include "tunnel_map.h"

    16

#include "vehicle.h"

    17

#include "timetable.h"

    18

#include "articulated_vehicles.h"

    19

#include "command_func.h"

    20

#include "pathfind.h"

    21

#include "npf.h"

    22

#include "station.h"

    23

#include "table/train_cmd.h"

    24

#include "news.h"

    25

#include "engine.h"

    26

#include "player.h"

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#include "sound.h"

    28

#include "depot.h"

    29

#include "waypoint.h"

    30

#include "vehicle_gui.h"

    31

#include "train.h"

    32

#include "bridge.h"

    33

#include "newgrf_callbacks.h"

    34

#include "newgrf_engine.h"

    35

#include "newgrf_sound.h"

    36

#include "newgrf_text.h"

    37

#include "direction_func.h"

    38

#include "yapf/yapf.h"

    39

#include "date.h"

    40

#include "cargotype.h"

    41

#include "group.h"

    42

#include "table/sprites.h"

    43

#include "tunnelbridge_map.h"

    44

#include "strings_func.h"

    45

#include "functions.h"

    46

#include "window_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

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

   169

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

   170

   171

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

   172

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

   173

   174

		/* update the 'first engine' */

   175

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

   176

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

   177

   178

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

   179

   180

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

   181

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

   182

   183

		/* Reset color map */

   184

		u->colormap = PAL_NONE;

   185

   186

		if (rvi_u->visual_effect != 0) {

   187

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

   188

		} else {

   189

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

   190

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

   191

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

   192

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

   193

				/* Steam is offset by -4 units */

   194

				u->u.rail.cached_vis_effect = 4;

   195

			} else {

   196

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

   197

				u->u.rail.cached_vis_effect = 8;

   198

			}

   199

		}

   200

   201

		if (!IsArticulatedPart(u)) {

   202

			/* Check powered wagon / visual effect callback */

   203

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

   204

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

   205

   206

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

   207

			}

   208

   209

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

   210

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

   211

				/* wagon is powered */

   212

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

   213

			} else {

   214

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

   215

			}

   216

   217

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

   218

			   have railtype normal */

   219

			if (rvi_u->power > 0) {

   220

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

   221

			}

   222

   223

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

   224

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

   225

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

   226

				u->u.rail.railtype = RAILTYPE_RAIL;

   227

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

   228

			}

   229

   230

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

   231

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

   232

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

   233

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

   234

			}

   235

		}

   236

   237

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

   238

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

   239

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

   240

		}

   241

   242

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

   243

   244

		/* check the vehicle length (callback) */

   245

		uint16 veh_len = CALLBACK_FAILED;

   246

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

   247

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

   248

		}

   249

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

   250

		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

   251

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

   252

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

   253

	}

   254

   255

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

   256

	v->u.rail.cached_max_speed = max_speed;

   257

   258

	/* 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) */

   259

	TrainCargoChanged(v);

   260

}

   261

   262

/* These two arrays are used for realistic acceleration. XXX: How should they

   263

 * be interpreted? */

   264

static const byte _curve_neighbours45[8][2] = {

   265

	{7, 1},

   266

	{0, 2},

   267

	{1, 3},

   268

	{2, 4},

   269

	{3, 5},

   270

	{4, 6},

   271

	{5, 7},

   272

	{6, 0},

   273

};

   274

   275

static const byte _curve_neighbours90[8][2] = {

   276

	{6, 2},

   277

	{7, 3},

   278

	{0, 4},

   279

	{1, 5},

   280

	{2, 6},

   281

	{3, 7},

   282

	{4, 0},

   283

	{5, 1},

   284

};

   285

   286

enum AccelType {

   287

	AM_ACCEL,

   288

	AM_BRAKE

   289

};

   290

   291

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

   292

{

   293

	const Order* o = &v->current_order;

   294

	StationID sid = GetStationIndex(tile);

   295

   296

	assert(v->type == VEH_TRAIN);

   297

	/* When does a train drive through a station

   298

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

   299

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

   300

		return false;

   301

	}

   302

   303

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

   304

   305

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

   306

		return false;

   307

	}

   308

   309

	return true;

   310

}

   311

   312

/** new acceleration*/

   313

static int GetTrainAcceleration(Vehicle *v, bool mode)

   314

{

   315

	int max_speed = 2000;

   316

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

   317

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

   318

   319

	/*first find the curve speed limit */

   320

	int numcurve = 0;

   321

	int sum = 0;

   322

	int pos = 0;

   323

	int lastpos = -1;

   324

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

   325

		Direction dir = u->direction;

   326

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

   327

		int i;

   328

   329

		for (i = 0; i < 2; i++) {

   330

			if ( _curve_neighbours45[dir][i] == ndir) {

   331

				curvecount[i]++;

   332

				if (lastpos != -1) {

   333

					numcurve++;

   334

					sum += pos - lastpos;

   335

					if (pos - lastpos == 1) {

   336

						max_speed = 88;

   337

					}

   338

				}

   339

				lastpos = pos;

   340

			}

   341

		}

   342

   343

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

   344

		if (_curve_neighbours90[dir][0] == ndir ||

   345

				_curve_neighbours90[dir][1] == ndir) {

   346

			max_speed = 61;

   347

		}

   348

	}

   349

   350

	if (numcurve > 0) sum /= numcurve;

   351

   352

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

   353

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

   354

   355

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

   356

			max_speed = 0xFFFF;

   357

		} else if (total > 1) {

   358

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

   359

		}

   360

	}

   361

   362

	max_speed += (max_speed / 2) * v->u.rail.railtype;

   363

   364

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

   365

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

   366

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

   367

			int delta_v;

   368

   369

			max_speed = 120;

   370

   371

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

   372

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

   373

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

   374

   375

			max_speed = max(max_speed, 25 * station_length);

   376

		}

   377

	}

   378

   379

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

   380

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

   381

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

   382

   383

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

   384

	int incl = 0;

   385

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

   386

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

   387

		num++;

   388

		drag_coeff += 3;

   389

   390

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

   391

   392

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

   393

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

   394

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

   395

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

   396

		}

   397

	}

   398

   399

	v->max_speed = max_speed;

   400

   401

	const int area = 120;

   402

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

   403

	int resistance;

   404

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

   405

		resistance = 13 * mass / 10;

   406

		resistance += 60 * num;

   407

		resistance += friction * mass * speed / 1000;

   408

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

   409

	} else {

   410

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

   411

	}

   412

	resistance += incl;

   413

	resistance *= 4; //[N]

   414

   415

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

   416

	 * actually double the train's power */

   417

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

   418

	int force;

   419

	if (speed > 2) {

   420

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

   421

			case RAILTYPE_RAIL:

   422

			case RAILTYPE_ELECTRIC:

   423

			case RAILTYPE_MONO:

   424

				force = power / speed; //[N]

   425

				force *= 22;

   426

				force /= 10;

   427

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

   428

				break;

   429

   430

			default: NOT_REACHED();

   431

			case RAILTYPE_MAGLEV:

   432

				force = power / 25;

   433

				break;

   434

		}

   435

	} else {

   436

		/* "kickoff" acceleration */

   437

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

   438

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

   439

	}

   440

   441

	if (force <= 0) force = 10000;

   442

   443

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

   444

   445

	if (mode == AM_ACCEL) {

   446

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

   447

	} else {

   448

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

   449

	}

   450

}

   451

   452

static void UpdateTrainAcceleration(Vehicle* v)

   453

{

   454

	assert(IsFrontEngine(v));

   455

   456

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

   457

   458

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

   459

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

   460

	assert(weight != 0);

   461

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

   462

}

   463

   464

int Train::GetImage(Direction direction) const

   465

{

   466

	int img = this->spritenum;

   467

	int base;

   468

   469

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

   470

   471

	if (is_custom_sprite(img)) {

   472

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

   473

		if (base != 0) return base;

   474

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

   475

	}

   476

   477

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

   478

   479

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

   480

	return base;