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/* $Id$ */

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#include "stdafx.h"

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#include "openttd.h"

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#include "debug.h"

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#include "functions.h"

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#include "gui.h"

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#include "table/strings.h"

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#include "map.h"

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#include "tile.h"

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#include "vehicle.h"

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#include "command.h"

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#include "pathfind.h"

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#include "npf.h"

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#include "station.h"

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#include "table/train_cmd.h"

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#include "news.h"

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#include "engine.h"

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#include "player.h"

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#include "sound.h"

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#include "depot.h"

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#include "debug.h"

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#include "waypoint.h"

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#include "vehicle_gui.h"

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    26

#define IS_FIRSTHEAD_SPRITE(spritenum) \

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	(is_custom_sprite(spritenum) ? IS_CUSTOM_FIRSTHEAD_SPRITE(spritenum) : _engine_sprite_add[spritenum] == 0)

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    29

static bool TrainCheckIfLineEnds(Vehicle *v);

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static void TrainController(Vehicle *v);

    31

    32

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

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

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static const byte _state_dir_table[4] = { 0x20, 8, 0x10, 4 };

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    36

/**

    37

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

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 * the consist changes.

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 * @param v First vehicle of the consist.

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 */

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	Vehicle *u;

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	uint16 weight = 0;

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    46

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

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

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		uint16 vweight = 0;

    49

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

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    52

		// Vehicle weight is not added for articulated parts.

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		if (u->subtype != TS_Artic_Part) {

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

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			vweight += rvi->weight;

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    57

			// powered wagons have extra weight added

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

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				vweight += RailVehInfo(v->engine_type)->pow_wag_weight;

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		}

    61

    62

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

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		weight += vweight;

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    65

		// store vehicle weight in cache

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		u->u.rail.cached_veh_weight = vweight;

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	};

    68

    69

	// store consist weight in cache

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	v->u.rail.cached_weight = weight;

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}

    72

    73

/**

    74

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

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

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

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 * @param v First vehicle of the chain.

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 */

    81

	const RailVehicleInfo *rvi_v;

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	Vehicle *u;

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	uint16 max_speed = 0xFFFF;

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	uint32 power = 0;

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	EngineID first_engine;

    86

    87

	assert(v->type == VEH_Train);

    88

    89

	assert(v->subtype == TS_Front_Engine || v->subtype == TS_Free_Car);

    90

    91

	rvi_v = RailVehInfo(v->engine_type);

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	first_engine = (v->subtype == TS_Front_Engine) ? v->engine_type : INVALID_VEHICLE;

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	v->u.rail.cached_total_length = 0;

    94

    95

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

    96

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

    97

		uint16 veh_len;

    98

    99

		// update the 'first engine'

   100

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

   101

   102

		if (rvi_u->visual_effect != 0) {

   103

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

   104

		} else {

   105

			if (rvi_u->flags & RVI_WAGON || u->subtype == TS_Artic_Part) {

   106

				// Wagons and articulated parts have no effect by default

   107

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

   108

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

   109

				// Steam is offset by -4 units

   110

				u->u.rail.cached_vis_effect = 4;

   111

			} else {

   112

				// Diesel fumes and sparks come from the centre

   113

				u->u.rail.cached_vis_effect = 8;

   114

			}

   115

		}

   116

   117

		if (u->subtype != TS_Artic_Part) {

   118

			// power is the sum of the powers of all engines and powered wagons in the consist

   119

			power += rvi_u->power;

   120

   121

			// check if its a powered wagon

   122

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

   123

			if ((rvi_v->pow_wag_power != 0) && (rvi_u->flags & RVI_WAGON) && UsesWagonOverride(u)) {

   124

				if (HASBIT(rvi_u->callbackmask, CBM_WAGON_POWER)) {

   125

					uint16 callback = GetCallBackResult(CBID_WAGON_POWER,  u->engine_type, u);

   126

   127

					if (callback != CALLBACK_FAILED)

   128

						u->u.rail.cached_vis_effect = callback;

   129

				}

   130

   131

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

   132

					/* wagon is powered */

   133

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

   134

					power += rvi_v->pow_wag_power;

   135

				}

   136

			}

   137

   138

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

   139

			if (!(rvi_u->flags & RVI_WAGON) || _patches.wagon_speed_limits)

   140

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

   141

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

   142

		}

   143

   144

		// check the vehicle length (callback)

   145

		veh_len = CALLBACK_FAILED;

   146

		if (HASBIT(rvi_u->callbackmask, CBM_VEH_LENGTH))

   147

			veh_len = GetCallBackResult(CBID_VEH_LENGTH,  u->engine_type, u);

   148

		if (veh_len == CALLBACK_FAILED)

   149

			veh_len = rvi_u->shorten_factor;

   150

		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

   151

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

   152

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

   153

   154

	};

   155

   156

	// store consist weight/max speed in cache

   157

	v->u.rail.cached_max_speed = max_speed;

   158

	v->u.rail.cached_power = power;

   159

   160

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

   161

	TrainCargoChanged(v);

   162

}

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   164

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

   165

 * be interpreted? */

   166

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

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	{7, 1},

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	{0, 2},

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	{1, 3},

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	{2, 4},

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	{3, 5},

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	{4, 6},

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	{5, 7},

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	{6, 0},

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};

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   177

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

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	{6, 2},

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	{7, 3},

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	{0, 4},

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	{1, 5},

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	{2, 6},

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	{3, 7},

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	{4, 0},

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	{5, 1},

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};

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   188

enum AccelType {

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	AM_ACCEL,

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	AM_BRAKE

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};

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   193

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

   194

{

   195

	const Order* o = &v->current_order;

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   197

	assert(v->type == VEH_Train);

   198

	assert(IsTileType(v->tile, MP_STATION));

   199

	//When does a train drive through a station

   200

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

   201

	if (_patches.new_nonstop && o->flags & OF_NON_STOP &&

   202

			_m[tile].m2 == o->station )

   203

		return false;

   204

   205

	if (v->last_station_visited == _m[tile].m2)

   206

		return false;

   207

   208

	if (_m[tile].m2 != o->station &&

   209

			(o->flags & OF_NON_STOP || _patches.new_nonstop))

   210

		return false;

   211

   212

	return true;

   213

}

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   215

//new acceleration

   216

static int GetTrainAcceleration(Vehicle *v, bool mode)

   217

{

   218

	const Vehicle *u;

   219

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

   220

	int power = 0;

   221

	int mass = 0;

   222

	int max_speed = 2000;

   223

	int area = 120;

   224

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

   225

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

   226

	int incl = 0;

   227

	int resistance;

   228

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

   229

	int force = 0x3FFFFFFF;

   230

	int pos = 0;

   231

	int lastpos = -1;

   232

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

   233

	int sum = 0;

   234

	int numcurve = 0;

   235

   236

	speed *= 10;

   237

	speed /= 16;

   238

   239

	//first find the curve speed limit

   240

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

   241

		int dir = u->direction;

   242

		int ndir = u->next->direction;

   243

		int i;

   244

   245

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

   246

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

   247

				curvecount[i]++;

   248

				if (lastpos != -1) {

   249

					numcurve++;

   250

					sum += pos - lastpos;

   251

					if (pos - lastpos == 1) {

   252

						max_speed = 88;

   253

					}

   254

				}

   255

				lastpos = pos;

   256

			}

   257

		}

   258

   259

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

   260

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

   261

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

   262

			max_speed = 61;

   263

		}

   264

	}

   265

   266

	if (numcurve > 0) sum /= numcurve;

   267

   268

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

   269

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

   270

   271

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

   272

			max_speed = 0xFFFF;

   273

		} else if (total > 1) {

   274

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

   275

		}

   276

	}

   277

   278

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

   279

   280

	if (IsTileType(v->tile, MP_STATION) && v->subtype == TS_Front_Engine) {

   281

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

   282

			int station_length = 0;

   283

			TileIndex tile = v->tile;

   284

			int delta_v;

   285

   286

			max_speed = 120;

   287

			do {

   288

				station_length++;

   289

				tile = TILE_ADD(tile, TileOffsByDir(v->direction / 2));

   290

			} while (IsCompatibleTrainStationTile(tile, v->tile));

   291

   292

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

   293

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

   294

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

   295

   296

			max_speed = max(max_speed, 25 * station_length);

   297

		}

   298

	}

   299

   300

	mass = v->u.rail.cached_weight;

   301

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

   302

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

   303

   304

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

   305

		num++;

   306

		drag_coeff += 3;

   307

   308

		if (u->u.rail.track == 0x80)

   309

			max_speed = min(61, max_speed);

   310

   311

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

   312

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

   313

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

   314

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

   315

		}

   316

	}

   317

   318

	v->max_speed = max_speed;

   319

   320

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

   321

		resistance = 13 * mass / 10;

   322

		resistance += 60 * num;

   323

		resistance += friction * mass * speed / 1000;

   324

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

   325

	} else

   326

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

   327

	resistance += incl;

   328

	resistance *= 4; //[N]

   329

   330

	if (speed > 0) {

   331

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

   332

			case RAILTYPE_RAIL:

   333

			case RAILTYPE_MONO:

   334

				force = power / speed; //[N]

   335

				force *= 22;

   336

				force /= 10;

   337

				break;

   338

   339

			case RAILTYPE_MAGLEV:

   340

				force = power / 25;

   341

				break;

   342

		}

   343

	} else {

   344

		//"kickoff" acceleration

   345

		force = (mass * 8) + resistance;

   346

	}

   347

   348

	if (force <= 0) force = 10000;

   349

   350

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

   351

   352

	if (mode == AM_ACCEL) {

   353

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

   354

	} else {

   355

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

   356

	}

   357

}

   358

   359

void UpdateTrainAcceleration(Vehicle *v)

   360

{

   361

	uint power = 0;

   362

	uint weight = 0;

   363

   364

	assert(v->subtype == TS_Front_Engine);

   365

   366

	weight = v->u.rail.cached_weight;

   367

	power = v->u.rail.cached_power;

   368

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

   369

   370

	assert(weight != 0);

   371

   372

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

   373

}

   374

   375

int GetTrainImage(const Vehicle *v, byte direction)

   376

{

   377

	int img = v->spritenum;

   378

	int base;

   379

   380

	if (is_custom_sprite(img)) {

   381

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

   382

		if (base != 0) return base;

   383

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

   384

	}

   385

   386

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

   387

   389

	return base;

   390

}

   391

   392

extern int _traininfo_vehicle_pitch;

   393

   394

void DrawTrainEngine(int x, int y, EngineID engine, uint32 image_ormod)

   395

{

   396

	const RailVehicleInfo *rvi = RailVehInfo(engine);

   397

   398

	int img = rvi->image_index;

   399

	uint32 image = 0;

   400

   401

	if (is_custom_sprite(img)) {

   402

		image = GetCustomVehicleIcon(engine, 6);

   403

		if (image == 0) {

   404

			img = orig_rail_vehicle_info[engine].image_index;

   405

		} else {

   406

			y += _traininfo_vehicle_pitch;

   407

		}

   408

	}

   409

	if (image == 0) {

   410

		image = (6 & _engine_sprite_and[img]) + _engine_sprite_base[img];

   411

	}

   412

   413

	if (rvi->flags & RVI_MULTIHEAD) {

   414

		DrawSprite(image | image_ormod, x - 14, y);

   415

		x += 15;

   416

		image = 0;

   417

		if (is_custom_sprite(img)) {

   418

			image = GetCustomVehicleIcon(engine, 2);

   419

			if (image == 0) img = orig_rail_vehicle_info[engine].image_index;

   420

		}

   421

		if (image == 0) {

   422

			image =

   423

				((6 + _engine_sprite_add[img + 1]) & _engine_sprite_and[img + 1]) +

   424

				_engine_sprite_base[img + 1];

   425

		}

   426

	}

   427

	DrawSprite(image | image_ormod, x, y);

   428

}

   429

   430

static uint CountArticulatedParts(const RailVehicleInfo *rvi, EngineID engine_type)

   431

{

   432

	uint16 callback;

   433

	uint i;

   434

   436

   437

	for (i = 1; i < 10; i++) {

   438

		callback = GetCallBackResult(CBID_ARTIC_ENGINE + (i << 8), engine_type, NULL);

   440

	}

   441

   442

	return i - 1;

   443

}

   444

   445

static void AddArticulatedParts(const RailVehicleInfo *rvi, Vehicle **vl)

   446

{

   447

	const RailVehicleInfo *rvi_artic;

   448

	EngineID engine_type;

   449

	Vehicle *v = vl[0];

   450

	Vehicle *u = v;

   451

	uint16 callback;

   452

	bool flip_image;

   453

	uint i;

   454

   455

	if (!HASBIT(rvi->callbackmask, CBM_ARTIC_ENGINE))

   456

		return;

   457

   458

	for (i = 1; i < 10; i++) {

   459

		callback = GetCallBackResult(CBID_ARTIC_ENGINE + (i << 8), v->engine_type, NULL);

   460

		if (callback == CALLBACK_FAILED || callback == 0xFF)

   461

			return;

   462

   463

		u->next = vl[i];

   464

		u = u->next;

   465

   466

		engine_type = GB(callback, 0, 7);

   467

		flip_image = HASBIT(callback, 7);

   468

		rvi_artic = RailVehInfo(engine_type);

   469

   470

		// get common values from first engine

   471

		u->direction = v->direction;

   472

		u->owner = v->owner;

   473

		u->tile = v->tile;

   474

		u->x_pos = v->x_pos;

   475

		u->y_pos = v->y_pos;

   476

		u->z_pos = v->z_pos;

   477

		u->z_height = v->z_height;

   478

		u->u.rail.track = v->u.rail.track;

   479

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

   480

		u->build_year = v->build_year;

   481

		u->vehstatus = v->vehstatus & ~VS_STOPPED;

   482

		u->u.rail.first_engine = v->engine_type;

   483

   484

		// get more settings from rail vehicle info

   485

		u->spritenum = rvi_artic->image_index;

   486

		if (flip_image) u->spritenum++;

   487

		u->cargo_type = rvi_artic->cargo_type;

   488

		u->cargo_cap = rvi_artic->capacity;

   489

		u->max_speed = 0;