1

/* $Id$ */

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     3

#include "stdafx.h"

     4

#include "openttd.h"

     5

#include "bridge_map.h"

     6

#include "debug.h"

     7

#include "functions.h"

     8

#include "gui.h"

     9

#include "station_map.h"

    10

#include "table/strings.h"

    11

#include "map.h"

    12

#include "tile.h"

    13

#include "tunnel_map.h"

    14

#include "vehicle.h"

    15

#include "command.h"

    16

#include "pathfind.h"

    17

#include "npf.h"

    18

#include "station.h"

    19

#include "table/train_cmd.h"

    20

#include "news.h"

    21

#include "engine.h"

    22

#include "player.h"

    23

#include "sound.h"

    24

#include "depot.h"

    25

#include "waypoint.h"

    26

#include "vehicle_gui.h"

    27

#include "train.h"

    28

#include "bridge.h"

    29

#include "newgrf_callbacks.h"

    30

#include "newgrf_engine.h"

    31

#include "newgrf_sound.h"

    32

#include "newgrf_text.h"

    33

#include "direction.h"

    34

#include "yapf/yapf.h"

    35

#include "date.h"

    36

    37

static bool TrainCheckIfLineEnds(Vehicle *v);

    38

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

    39

    40

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

    41

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

    43

    44

    45

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

    46

 * @param cargo Cargo type to get multiplier for

    47

 * @return Cargo weight multiplier

    48

 */

    49

byte FreightWagonMult(CargoID cargo)

    50

{

    51

	// XXX NewCargos introduces a specific "is freight" flag for this test.

    52

	if (cargo == CT_PASSENGERS || cargo == CT_MAIL) return 1;

    53

	return _patches.freight_trains;

    54

}

    55

    56

    57

/**

    58

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

    59

 * @param v First vehicle of the consist.

    60

 */

    61

void TrainPowerChanged(Vehicle* v)

    62

{

    63

	Vehicle* u;

    64

	uint32 power = 0;

    65

	uint32 max_te = 0;

    66

    67

	for (u = v; u != NULL; u = u->next) {

    68

		/* Power is not added for articulated parts */

    69

		if (IsArticulatedPart(u)) continue;

    70

    71

		RailType railtype = (IsLevelCrossingTile(u->tile) ? GetRailTypeCrossing(u->tile) : GetRailType(u->tile));

    72

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

    73

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

    74

    75

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

    76

    77

		if (engine_has_power && rvi_u->power != 0) {

    78

			power += rvi_u->power;

    79

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

    80

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

    81

		}

    82

    83

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

    84

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

    85

		}

    86

	}

    87

    88

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

    89

		v->u.rail.cached_power = power;

    90

		v->u.rail.cached_max_te = max_te;

    91

		InvalidateWindow(WC_VEHICLE_DETAILS, v->index);

    92

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

    93

	}

    94

}

    95

    96

    97

/**

    98

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

    99

 * the consist changes.

   100

 * @param v First vehicle of the consist.

   101

 */

   102

static void TrainCargoChanged(Vehicle* v)

   103

{

   104

	Vehicle *u;

   105

	uint32 weight = 0;

   106

   107

	for (u = v; u != NULL; u = u->next) {

   108

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

   109

		uint32 vweight = (_cargoc.weights[u->cargo_type] * u->cargo_count * FreightWagonMult(u->cargo_type)) / 16;

   110

   111

		// Vehicle weight is not added for articulated parts.

   112

		if (!IsArticulatedPart(u)) {

   113

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

   114

			vweight += rvi->weight;

   115

   116

			// powered wagons have extra weight added

   117

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

   118

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

   119

		}

   120

   121

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

   122

		weight += vweight;

   123

   124

		// store vehicle weight in cache

   125

		u->u.rail.cached_veh_weight = vweight;

   126

	};

   127

   128

	// store consist weight in cache

   129

	v->u.rail.cached_weight = weight;

   130

   131

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

   132

	TrainPowerChanged(v);

   133

}

   134

   135

   136

/**

   137

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

   138

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

   139

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

   140

 * @param v First vehicle of the chain.

   141

 */

   142

void TrainConsistChanged(Vehicle* v)

   143

{

   144

	const RailVehicleInfo *rvi_v;

   145

	Vehicle *u;

   146

	uint16 max_speed = 0xFFFF;

   147

	EngineID first_engine;

   148

   149

	assert(v->type == VEH_Train);

   150

   151

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

   152

   153

	rvi_v = RailVehInfo(v->engine_type);

   154

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

   155

	v->u.rail.cached_total_length = 0;

   156

	v->u.rail.compatible_railtypes = 0;

   157

   158

	for (u = v; u != NULL; u = u->next) {

   159

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

   160

		uint16 veh_len;

   161

   162

		// Update the v->first cache. This is faster than having to brute force it later.

   163

		if (u->first == NULL) u->first = v;

   164

   165

		// update the 'first engine'

   166

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

   167

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

   168

   169

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

   170

   171

		if (rvi_u->visual_effect != 0) {

   172

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

   173

		} else {

   174

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

   175

				// Wagons and articulated parts have no effect by default

   176

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

   177

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

   178

				// Steam is offset by -4 units

   179

				u->u.rail.cached_vis_effect = 4;

   180

			} else {

   181

				// Diesel fumes and sparks come from the centre

   182

				u->u.rail.cached_vis_effect = 8;

   183

			}

   184

		}

   185

   186

		if (!IsArticulatedPart(u)) {

   187

			// check if its a powered wagon

   188

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

   189

   190

			/* Check powered wagon / visual effect callback */

   191

			if (HASBIT(EngInfo(u->engine_type)->callbackmask, CBM_WAGON_POWER)) {

   192

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

   193

   194

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

   195

			}

   196

   197

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

   198

				UsesWagonOverride(u) && (u->u.rail.cached_vis_effect < 0x40)) {

   199

				/* wagon is powered */

   200

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

   201

			}

   202

   203

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

   204

			   have railtype normal */

   205

			if (rvi_u->power > 0) {

   206

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

   207

			}

   208

   209

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

   210

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

   211

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

   212

				u->u.rail.railtype = RAILTYPE_RAIL;

   213

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

   214

			}

   215

   216

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

   217

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

   218

				rvi_u->max_speed != 0 && !UsesWagonOverride(u))

   219

				max_speed = min(rvi_u->max_speed, max_speed);

   220

		}

   221

   222

		// check the vehicle length (callback)

   223

		veh_len = CALLBACK_FAILED;

   224

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

   225

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

   226

		}

   227

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

   228

		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

   229

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

   230

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

   231

   232

	};

   233

   234

	// store consist weight/max speed in cache

   235

	v->u.rail.cached_max_speed = max_speed;

   236

   237

	// 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)

   238

	TrainCargoChanged(v);

   239

}

   240

   241

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

   242

 * be interpreted? */

   243

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

   244

	{7, 1},

   245

	{0, 2},

   246

	{1, 3},

   247

	{2, 4},

   248

	{3, 5},

   249

	{4, 6},

   250

	{5, 7},

   251

	{6, 0},

   252

};

   253

   254

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

   255

	{6, 2},

   256

	{7, 3},

   257

	{0, 4},

   258

	{1, 5},

   259

	{2, 6},

   260

	{3, 7},

   261

	{4, 0},

   262

	{5, 1},

   263

};

   264

   265

enum AccelType {

   266

	AM_ACCEL,

   267

	AM_BRAKE

   268

};

   269

   270

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

   271

{

   272

	const Order* o = &v->current_order;

   273

	StationID sid = GetStationIndex(tile);

   274

   275

	assert(v->type == VEH_Train);

   276

	//When does a train drive through a station

   277

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

   278

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

   279

		return false;

   280

	}

   281

   282

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

   283

   284

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

   285

		return false;

   286

	}

   287

   288

	return true;

   289

}

   290

   291

//new acceleration

   292

static int GetTrainAcceleration(Vehicle *v, bool mode)

   293

{

   294

	const Vehicle *u;

   295

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

   296

	int power = 0;

   297

	int mass = 0;

   298

	int max_speed = 2000;

   299

	int area = 120;

   300

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

   301

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

   302

	int incl = 0;

   303

	int resistance;

   304

	int speed = v->cur_speed; //[mph]

   305

	int force = 0x3FFFFFFF;

   306

	int pos = 0;

   307

	int lastpos = -1;

   308

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

   309

	int sum = 0;

   310

	int numcurve = 0;

   311

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

   312

   313

	speed *= 10;

   314

	speed /= 16;

   315

   316

	//first find the curve speed limit

   317

	for (u = v; u->next != NULL; u = u->next, pos++) {

   318

		Direction dir = u->direction;

   319

		Direction ndir = u->next->direction;

   320

		int i;

   321

   322

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

   323

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

   324

				curvecount[i]++;

   325

				if (lastpos != -1) {

   326

					numcurve++;

   327

					sum += pos - lastpos;

   328

					if (pos - lastpos == 1) {

   329

						max_speed = 88;

   330

					}

   331

				}

   332

				lastpos = pos;

   333

			}

   334

		}

   335

   336

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

   337

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

   338

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

   339

			max_speed = 61;

   340

		}

   341

	}

   342

   343

	if (numcurve > 0) sum /= numcurve;

   344

   345

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

   346

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

   347

   348

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

   349

			max_speed = 0xFFFF;

   350

		} else if (total > 1) {

   351

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

   352

		}

   353

	}

   354

   355

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

   356

   357

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

   358

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

   359

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

   360

			int delta_v;

   361

   362

			max_speed = 120;

   363

   364

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

   365

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

   366

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

   367

   368

			max_speed = max(max_speed, 25 * station_length);

   369

		}

   370

	}

   371

   372

	mass = v->u.rail.cached_weight;

   373

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

   374

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

   375

   376

	for (u = v; u != NULL; u = u->next) {

   377

		num++;

   378

		drag_coeff += 3;

   379

   381

   382

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

   383

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

   384

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

   385

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

   386

		}

   387

	}

   388

   389

	v->max_speed = max_speed;

   390

   391

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

   392

		resistance = 13 * mass / 10;

   393

		resistance += 60 * num;

   394

		resistance += friction * mass * speed / 1000;

   395

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

   396

	} else {

   397

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

   398

	}

   399

	resistance += incl;

   400

	resistance *= 4; //[N]

   401

   402

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

   403

	 * actually double the train's power */

   404

	if (speed > 2) {

   405

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

   406

			case RAILTYPE_RAIL:

   407

			case RAILTYPE_ELECTRIC:

   408

			case RAILTYPE_MONO:

   409

				force = power / speed; //[N]

   410

				force *= 22;

   411

				force /= 10;

   412

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

   413

				break;

   414

   415

			case RAILTYPE_MAGLEV:

   416

				force = power / 25;

   417

				break;

   418

   419

			default: NOT_REACHED();

   420

		}

   421

	} else {

   422

		//"kickoff" acceleration

   423

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

   424

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

   425

	}

   426

   427

	if (force <= 0) force = 10000;

   428

   429

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

   430

   431

	if (mode == AM_ACCEL) {

   432

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

   433

	} else {

   434

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

   435

	}

   436

}

   437

   438

static void UpdateTrainAcceleration(Vehicle* v)

   439

{

   440

	uint power = 0;

   441

	uint weight = 0;

   442

   443

	assert(IsFrontEngine(v));

   444

   445

	weight = v->u.rail.cached_weight;

   446

	power = v->u.rail.cached_power;

   447

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

   448

   449

	assert(weight != 0);

   450

   451

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

   452

}

   453

   454

int GetTrainImage(const Vehicle* v, Direction direction)

   455

{

   456

	int img = v->spritenum;

   457

	int base;

   458

   459

	if (HASBIT(v->u.rail.flags, VRF_REVERSE_DIRECTION)) direction = ReverseDir(direction);

   460

   461

	if (is_custom_sprite(img)) {

   462

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

   463

		if (base != 0) return base;

   464

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

   465

	}

   466

   467

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

   468

   469

	if (v->cargo_count >= v->cargo_cap / 2) base += _wagon_full_adder[img];

   470

	return base;

   471

}

   472

   473

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

   474

{

   475

	const RailVehicleInfo *rvi = RailVehInfo(engine);

   476

   477

	int img = rvi->image_index;

   478

	SpriteID image = 0;

   479

   480

	if (is_custom_sprite(img)) {

   481

		image = GetCustomVehicleIcon(engine, DIR_W);

   482

		if (image == 0) {

   483

			img = orig_rail_vehicle_info[engine].image_index;

   484

		} else {

   485

			y += _traininfo_vehicle_pitch;