1

/* $Id$ */

     2

/** @file elrail.cpp

     3

 * This file deals with displaying wires and pylons for electric railways.

     4

 * <h2>Basics</h2>

     5

 *

     6

 * <h3>Tile Types</h3>

     7

 *

     8

 * We have two different types of tiles in the drawing code:

     9

 * Normal Railway Tiles (NRTs) which can have more than one track on it, and

    10

 * Special Railways tiles (SRTs) which have only one track (like crossings, depots

    11

 * stations, etc).

    12

 *

    13

 * <h3>Location Categories</h3>

    14

 *

    15

 * All tiles are categorized into three location groups (TLG):

    16

 * Group 0: Tiles with both an even X coordinate and an even Y coordinate

    17

 * Group 1: Tiles with an even X and an odd Y coordinate

    18

 * Group 2: Tiles with an odd X and an even Y coordinate

    19

 * Group 3: Tiles with both an odd X and Y coordnate.

    20

 *

    21

 * <h3>Pylon Points</h3>

    22

 * <h4>Control Points</h4>

    23

 * A Pylon Control Point (PCP) is a position where a wire (or rather two)

    24

 * is mounted onto a pylon.

    25

 * Each NRT does contain 4 PCPs which are bitmapped to a byte

    26

 * variable and are represented by the DiagDirection enum

    27

 *

    28

 * Each track ends on two PCPs and thus requires one pylon on each end. However,

    29

 * there is one exception: Straight-and-level tracks only have one pylon every

    30

 * other tile.

    31

 *

    32

 * Now on each edge there are two PCPs: One from each adjacent tile. Both PCPs

    33

 * are merged using an OR operation (i. e. if one tile needs a PCP at the postion

    34

 * in question, both tiles get it).

    35

 *

    36

 * <h4>Position Points</h4>

    37

 * A Pylon Position Point (PPP) is a position where a pylon is located on the

    38

 * ground.  Each PCP owns 8 in (45 degree steps) PPPs that are located around

    39

 * it. PPPs are represented using the Direction enum. Each track bit has PPPs

    40

 * that are impossible (because the pylon would be situated on the track) and

    41

 * some that are preferred (because the pylon would be rectangular to the track).

    42

 *

    43

 * <img src="../../elrail_tile.png">

    44

 * <img src="../../elrail_track.png">

    45

 *

    46

 */

    47

    48

#include "stdafx.h"

    49

#include "openttd.h"

    50

#include "station_map.h"

    51

#include "viewport_func.h"

    52

#include "settings_type.h"

    53

#include "landscape.h"

    54

#include "rail_type.h"

    55

#include "debug.h"

    56

#include "tunnel_map.h"

    57

#include "road_map.h"

    58

#include "bridge_map.h"

    59

#include "bridge.h"

    60

#include "rail_map.h"

    61

#include "train.h"

    62

#include "rail_gui.h"

    63

#include "transparency.h"

    64

#include "tunnelbridge_map.h"

    65

#include "vehicle_func.h"

    66

#include "player_base.h"

    67

#include "tunnelbridge.h"

    68

#include "engine_func.h"

    69

    70

#include "table/sprites.h"

    71

#include "table/elrail_data.h"

    72

    73

static inline TLG GetTLG(TileIndex t)

    74

{

    75

	return (TLG)((HasBit(TileX(t), 0) << 1) + HasBit(TileY(t), 0));

    76

}

    77

    78

/**

    79

 * Finds which Electrified Rail Bits are present on a given tile.

    80

 * @param t tile to check

    81

 * @param override pointer to PCP override, can be NULL

    82

 * @return trackbits of tile if it is electrified

    83

 */

    84

static TrackBits GetRailTrackBitsUniversal(TileIndex t, byte *override)

    85

{

    86

	switch (GetTileType(t)) {

    87

		case MP_RAILWAY:

    88

			if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;

    89

			switch (GetRailTileType(t)) {

    90

				case RAIL_TILE_NORMAL: case RAIL_TILE_SIGNALS:

    91

					return GetTrackBits(t);

    92

				case RAIL_TILE_WAYPOINT:

    93

					return GetRailWaypointBits(t);

    94

				default:

    95

					return TRACK_BIT_NONE;

    96

			}

    97

			break;

    98

    99

		case MP_TUNNELBRIDGE:

   100

			if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;

   101

			if (override != NULL && (IsTunnel(t) || GetTunnelBridgeLength(t, GetOtherBridgeEnd(t)) > 0)) {

   102

				*override = 1 << GetTunnelBridgeDirection(t);

   103

			}

   104

			return AxisToTrackBits(DiagDirToAxis(GetTunnelBridgeDirection(t)));

   105

   106

		case MP_ROAD:

   107

			if (!IsLevelCrossing(t)) return TRACK_BIT_NONE;

   108

			if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;

   109

			return GetCrossingRailBits(t);

   110

   111

		case MP_STATION:

   112

			if (!IsRailwayStation(t)) return TRACK_BIT_NONE;

   113

			if (!HasCatenary(GetRailType(t))) return TRACK_BIT_NONE;

   114

			if (!IsStationTileElectrifiable(t)) return TRACK_BIT_NONE;

   115

			return TrackToTrackBits(GetRailStationTrack(t));

   116

   117

		default:

   118

			return TRACK_BIT_NONE;

   119

	}

   120

}

   121

   122

/** Corrects the tileh for certain tile types. Returns an effective tileh for the track on the tile.

   123

 * @param tile The tile to analyse

   124

 * @param *tileh the tileh

   125

 */

   126

static void AdjustTileh(TileIndex tile, Slope *tileh)

   127

{

   128

	if (IsTileType(tile, MP_TUNNELBRIDGE)) {

   129

		if (IsTunnel(tile)) {

   130

			*tileh = SLOPE_STEEP; // XXX - Hack to make tunnel entrances to always have a pylon

   131

		} else if (*tileh != SLOPE_FLAT) {

   132

			*tileh = SLOPE_FLAT;

   133

		} else {

   134

			*tileh = InclinedSlope(GetTunnelBridgeDirection(tile));

   135

		}

   136

	}

   137

}

   138

   139

/**

   140

 * Returns the Z position of a Pylon Control Point.

   141

 *

   142

 * @param tile The tile the pylon should stand on.

   143

 * @param PCPpos The PCP of the tile.

   144

 * @return The Z position of the PCP.

   145

 */

   146

static byte GetPCPElevation(TileIndex tile, DiagDirection PCPpos)

   147

{

   148

	/* The elevation of the "pylon"-sprite should be the elevation at the PCP.

   149

	 * PCPs are always on a tile edge.

   150

	 *

   151

	 * This position can be outside of the tile, i.e. ?_pcp_offset == TILE_SIZE > TILE_SIZE - 1.

   152

	 * So we have to move it inside the tile, because if the neighboured tile has a foundation,

   153

	 * that does not smoothly connect to the current tile, we will get a wrong elevation from GetSlopeZ().

   154

	 *

   155

	 * When we move the position inside the tile, we will get a wrong elevation if we have a slope.

   156

	 * To catch all cases we round the Z position to the next (TILE_HEIGHT / 2).

   157

	 * This will return the correct elevation for slopes and will also detect non-continuous elevation on edges.

   158

	 *

   159

	 * Also note that the result of GetSlopeZ() is very special on bridge-ramps.

   160

	 */

   161

   162

	byte z = GetSlopeZ(TileX(tile) * TILE_SIZE + min(x_pcp_offsets[PCPpos], TILE_SIZE - 1), TileY(tile) * TILE_SIZE + min(y_pcp_offsets[PCPpos], TILE_SIZE - 1));

   163

	return (z + 2) & ~3; // this means z = (z + TILE_HEIGHT / 4) / (TILE_HEIGHT / 2) * (TILE_HEIGHT / 2);

   164

}

   165

   166

/**

   167

 * Draws wires on a tunnel tile

   168

 *

   169

 * DrawTile_TunnelBridge() calls this function to draw the wires as SpriteCombine with the tunnel roof.

   170

 *

   171

 * @param ti The Tileinfo to draw the tile for

   172

 */

   173

void DrawCatenaryOnTunnel(const TileInfo *ti)

   174

{

   175

	/* xmin, ymin, xmax + 1, ymax + 1 of BB */

   176

	static const int _tunnel_wire_BB[4][4] = {

   177

		{ 0, 1, 16, 15 }, // NE

   178

		{ 1, 0, 15, 16 }, // SE

   179

		{ 0, 1, 16, 15 }, // SW

   180

		{ 1, 0, 15, 16 }, // NW

   181

	};

   182

   183

	if (!HasCatenary(GetRailType(ti->tile)) || _patches.disable_elrails) return;

   184

   185

	DiagDirection dir = GetTunnelBridgeDirection(ti->tile);

   186

   187

	const SortableSpriteStruct *sss = &CatenarySpriteData_Tunnel[dir];

   188

	const int *BB_data = _tunnel_wire_BB[dir];

   189

	AddSortableSpriteToDraw(

   190

		sss->image, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,

   191

		BB_data[2] - sss->x_offset, BB_data[3] - sss->y_offset, BB_Z_SEPARATOR - sss->z_offset + 1,

   192

		GetTileZ(ti->tile) + sss->z_offset,

   193

		IsTransparencySet(TO_CATENARY),

   194

		BB_data[0] - sss->x_offset, BB_data[1] - sss->y_offset, BB_Z_SEPARATOR - sss->z_offset

   195

	);

   196

}

   197

   198

/** Draws wires and, if required, pylons on a given tile

   199

 * @param ti The Tileinfo to draw the tile for

   200

 */

   201

static void DrawCatenaryRailway(const TileInfo *ti)

   202

{

   203

	/* Pylons are placed on a tile edge, so we need to take into account

   204

	 * the track configuration of 2 adjacent tiles. trackconfig[0] stores the

   205

	 * current tile (home tile) while [1] holds the neighbour */

   206

	TrackBits trackconfig[TS_END];

   207

	bool isflat[TS_END];

   208

	/* Note that ti->tileh has already been adjusted for Foundations */

   209

	Slope tileh[TS_END] = { ti->tileh, SLOPE_FLAT };

   210

   211

	/* Half tile slopes coincide only with horizontal/vertical track.

   212

	 * Faking a flat slope results in the correct sprites on positions. */

   213

	if (IsHalftileSlope(tileh[TS_HOME])) tileh[TS_HOME] = SLOPE_FLAT;

   214

   215

	TLG tlg = GetTLG(ti->tile);

   216

	byte PCPstatus = 0;

   217

	byte OverridePCP = 0;

   218

	byte PPPpreferred[DIAGDIR_END];

   219

	byte PPPallowed[DIAGDIR_END];

   220

	DiagDirection i;

   221

	Track t;

   222

   223

	/* Find which rail bits are present, and select the override points.

   224

	 * We don't draw a pylon:

   225

	 * 1) INSIDE a tunnel (we wouldn't see it anyway)

   226

	 * 2) on the "far" end of a bridge head (the one that connects to bridge middle),

   227

	 *    because that one is drawn on the bridge. Exception is for length 0 bridges

   228

	 *    which have no middle tiles */

   229

	trackconfig[TS_HOME] = GetRailTrackBitsUniversal(ti->tile, &OverridePCP);

   230

	/* If a track bit is present that is not in the main direction, the track is level */

   231

	isflat[TS_HOME] = ((trackconfig[TS_HOME] & (TRACK_BIT_HORZ | TRACK_BIT_VERT)) != 0);

   232

   233

	AdjustTileh(ti->tile, &tileh[TS_HOME]);

   234

   235

	for (i = DIAGDIR_NE; i < DIAGDIR_END; i++) {

   236

		TileIndex neighbour = ti->tile + TileOffsByDiagDir(i);

   237

		Foundation foundation = FOUNDATION_NONE;

   238

		int k;

   239

   240

		/* Here's one of the main headaches. GetTileSlope does not correct for possibly

   241

		 * existing foundataions, so we do have to do that manually later on.*/

   242

		tileh[TS_NEIGHBOUR] = GetTileSlope(neighbour, NULL);

   243

		trackconfig[TS_NEIGHBOUR] = GetRailTrackBitsUniversal(neighbour, NULL);

   244

		if (IsTunnelTile(neighbour) && i != GetTunnelBridgeDirection(neighbour)) trackconfig[TS_NEIGHBOUR] = TRACK_BIT_NONE;

   245

   246

		/* If the neighboured tile does not smoothly connect to the current tile (because of a foundation),

   247

		 * we have to draw all pillars on the current tile. */

   248

		if (GetPCPElevation(ti->tile, i) != GetPCPElevation(neighbour, ReverseDiagDir(i))) trackconfig[TS_NEIGHBOUR] = TRACK_BIT_NONE;

   249

   250

		isflat[TS_NEIGHBOUR] = ((trackconfig[TS_NEIGHBOUR] & (TRACK_BIT_HORZ | TRACK_BIT_VERT)) != 0);

   251

   252

		PPPpreferred[i] = 0xFF; // We start with preferring everything (end-of-line in any direction)

   253

		PPPallowed[i] = AllowedPPPonPCP[i];

   254

   255

		/* We cycle through all the existing tracks at a PCP and see what

   256

		 * PPPs we want to have, or may not have at all */

   257

		for (k = 0; k < NUM_TRACKS_AT_PCP; k++) {

   258

			/* Next to us, we have a bridge head, don't worry about that one, if it shows away from us */

   259

			if (TrackSourceTile[i][k] == TS_NEIGHBOUR &&

   260

			    IsBridgeTile(neighbour) &&

   261

			    GetTunnelBridgeDirection(neighbour) == ReverseDiagDir(i)) {

   262

				continue;

   263

			}

   264

   265

			/* We check whether the track in question (k) is present in the tile

   266

			 * (TrackSourceTile) */

   267

			if (HasBit(trackconfig[TrackSourceTile[i][k]], TracksAtPCP[i][k])) {

   268

				/* track found, if track is in the neighbour tile, adjust the number

   269

				 * of the PCP for preferred/allowed determination*/

   270

				DiagDirection PCPpos = (TrackSourceTile[i][k] == TS_HOME) ? i : ReverseDiagDir(i);

   271

				SetBit(PCPstatus, i); // This PCP is in use

   272

   273

				PPPpreferred[i] &= PreferredPPPofTrackAtPCP[TracksAtPCP[i][k]][PCPpos];

   274

				PPPallowed[i] &= ~DisallowedPPPofTrackAtPCP[TracksAtPCP[i][k]][PCPpos];

   275

			}

   276

		}

   277

   278

		/* Deactivate all PPPs if PCP is not used */

   279

		PPPpreferred[i] *= HasBit(PCPstatus, i);

   280

		PPPallowed[i] *= HasBit(PCPstatus, i);

   281

   282

		/* A station is always "flat", so adjust the tileh accordingly */

   283

		if (IsTileType(neighbour, MP_STATION)) tileh[TS_NEIGHBOUR] = SLOPE_FLAT;

   284

   285

		/* Read the foundataions if they are present, and adjust the tileh */

   286

		if (trackconfig[TS_NEIGHBOUR] != TRACK_BIT_NONE && IsTileType(neighbour, MP_RAILWAY) && HasCatenary(GetRailType(neighbour))) foundation = GetRailFoundation(tileh[TS_NEIGHBOUR], trackconfig[TS_NEIGHBOUR]);

   287

		if (IsBridgeTile(neighbour)) {

   288

			foundation = GetBridgeFoundation(tileh[TS_NEIGHBOUR], DiagDirToAxis(GetTunnelBridgeDirection(neighbour)));

   289

		}

   290

   291

		ApplyFoundationToSlope(foundation, &tileh[TS_NEIGHBOUR]);

   292

   293

	/* Half tile slopes coincide only with horizontal/vertical track.

   294

	 * Faking a flat slope results in the correct sprites on positions. */

   295

		if (IsHalftileSlope(tileh[TS_NEIGHBOUR])) tileh[TS_NEIGHBOUR] = SLOPE_FLAT;

   296

   297

		AdjustTileh(neighbour, &tileh[TS_NEIGHBOUR]);

   298

   299

		/* If we have a straight (and level) track, we want a pylon only every 2 tiles

   300

		 * Delete the PCP if this is the case. */

   301

		/* Level means that the slope is the same, or the track is flat */

   302

		if (tileh[TS_HOME] == tileh[TS_NEIGHBOUR] || (isflat[TS_HOME] && isflat[TS_NEIGHBOUR])) {

   303

			for (k = 0; k < NUM_IGNORE_GROUPS; k++)

   304

				if (PPPpreferred[i] == IgnoredPCP[k][tlg][i]) ClrBit(PCPstatus, i);

   305

		}

   306

   307

		/* Now decide where we draw our pylons. First try the preferred PPPs, but they may not exist.

   308

		 * In that case, we try the any of the allowed ones. if they don't exist either, don't draw

   309

		 * anything. Note that the preferred PPPs still contain the end-of-line markers.

   310

		 * Remove those (simply by ANDing with allowed, since these markers are never allowed) */

   311

		if ((PPPallowed[i] & PPPpreferred[i]) != 0) PPPallowed[i] &= PPPpreferred[i];

   312

   313

		if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile)) {

   314

			Track bridgetrack = GetBridgeAxis(ti->tile) == AXIS_X ? TRACK_X : TRACK_Y;

   315

			uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));

   316

   317

			if ((height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) &&

   318

					(i == PCPpositions[bridgetrack][0] || i == PCPpositions[bridgetrack][1])) {

   319

				SetBit(OverridePCP, i);

   320

			}

   321

		}

   322

   323

		if (PPPallowed[i] != 0 && HasBit(PCPstatus, i) && !HasBit(OverridePCP, i)) {

   324

			for (k = 0; k < DIR_END; k++) {

   325

				byte temp = PPPorder[i][GetTLG(ti->tile)][k];

   326

   327

				if (HasBit(PPPallowed[i], temp)) {

   328

					uint x  = ti->x + x_pcp_offsets[i] + x_ppp_offsets[temp];

   329

					uint y  = ti->y + y_pcp_offsets[i] + y_ppp_offsets[temp];

   330

   331

					/* Don't build the pylon if it would be outside the tile */

   332

					if (!HasBit(OwnedPPPonPCP[i], temp)) {

   333

						/* We have a neighour that will draw it, bail out */

   334

						if (trackconfig[TS_NEIGHBOUR] != 0) break;

   335

						continue; /* No neighbour, go looking for a better position */

   336

					}

   337

   338

					AddSortableSpriteToDraw(pylon_sprites[temp], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE,

   339

							GetPCPElevation(ti->tile, i),

   340

							IsTransparencySet(TO_CATENARY), -1, -1);

   341

					break; /* We already have drawn a pylon, bail out */

   342

				}

   343

			}

   344

		}

   345

	}

   346

   347

	/* Don't draw a wire under a low bridge */

   348

	if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && !IsTransparencySet(TO_CATENARY)) {

   349

		uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));

   350

   351

		if (height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) return;

   352

	}

   353

   354

	/* Drawing of pylons is finished, now draw the wires */

   355

	for (t = TRACK_BEGIN; t < TRACK_END; t++) {

   356

		if (HasBit(trackconfig[TS_HOME], t)) {

   357

			if (IsTunnelTile(ti->tile)) break; // drawn together with tunnel-roof (see DrawCatenaryOnTunnel())

   358

			byte PCPconfig = HasBit(PCPstatus, PCPpositions[t][0]) +

   359

				(HasBit(PCPstatus, PCPpositions[t][1]) << 1);

   360

   361

			const SortableSpriteStruct *sss;

   362

			int tileh_selector = !(tileh[TS_HOME] % 3) * tileh[TS_HOME] / 3; /* tileh for the slopes, 0 otherwise */

   363

   364

			assert(PCPconfig != 0); /* We have a pylon on neither end of the wire, that doesn't work (since we have no sprites for that) */

   365

			assert(!IsSteepSlope(tileh[TS_HOME]));

   366

			sss = &CatenarySpriteData[Wires[tileh_selector][t][PCPconfig]];

   367

   368

			/*

   369

			 * The "wire"-sprite position is inside the tile, i.e. 0 <= sss->?_offset < TILE_SIZE.

   370

			 * Therefore it is save to use GetSlopeZ() for the elevation.

   371

			 * Also note, that the result of GetSlopeZ() is very special for bridge-ramps.

   372

			 */

   373

			AddSortableSpriteToDraw(sss->image, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,

   374

				sss->x_size, sss->y_size, sss->z_size, GetSlopeZ(ti->x + sss->x_offset, ti->y + sss->y_offset) + sss->z_offset,

   375

				IsTransparencySet(TO_CATENARY));

   376

		}

   377

	}

   378

}

   379

   380

static void DrawCatenaryOnBridge(const TileInfo *ti)

   381

{

   382

	TileIndex end = GetSouthernBridgeEnd(ti->tile);

   383

	TileIndex start = GetOtherBridgeEnd(end);

   384

   385

	uint length = GetTunnelBridgeLength(start, end);

   386

	uint num = GetTunnelBridgeLength(ti->tile, start) + 1;

   387

	uint height;

   388

   389

	const SortableSpriteStruct *sss;

   390

	Axis axis = GetBridgeAxis(ti->tile);

   391

	TLG tlg = GetTLG(ti->tile);

   392

   393

	CatenarySprite offset = (CatenarySprite)(axis == AXIS_X ? 0 : WIRE_Y_FLAT_BOTH - WIRE_X_FLAT_BOTH);

   394

   395

	if ((length % 2) && num == length) {

   396

		/* Draw the "short" wire on the southern end of the bridge

   397

		 * only needed if the length of the bridge is odd */

   398

		sss = &CatenarySpriteData[WIRE_X_FLAT_BOTH + offset];

   399

	} else {

   400

		/* Draw "long" wires on all other tiles of the bridge (one pylon every two tiles) */

   401

		sss = &CatenarySpriteData[WIRE_X_FLAT_SW + (num % 2) + offset];

   402

	}

   403

   404

	height = GetBridgeHeight(end);

   405

   406

	AddSortableSpriteToDraw(sss->image, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,

   407

		sss->x_size, sss->y_size, sss->z_size, height + sss->z_offset,

   408

		IsTransparencySet(TO_CATENARY)

   409

	);

   410

   411

	/* Finished with wires, draw pylons */

   412

	/* every other tile needs a pylon on the northern end */

   413

	if (num % 2) {

   414

		DiagDirection PCPpos = (axis == AXIS_X ? DIAGDIR_NE : DIAGDIR_NW);

   415

		Direction PPPpos = (axis == AXIS_X ? DIR_NW : DIR_NE);

   416

		if (HasBit(tlg, (axis == AXIS_X ? 0 : 1))) PPPpos = ReverseDir(PPPpos);

   417

		uint x = ti->x + x_pcp_offsets[PCPpos] + x_ppp_offsets[PPPpos];

   418

		uint y = ti->y + y_pcp_offsets[PCPpos] + y_ppp_offsets[PPPpos];

   419

		AddSortableSpriteToDraw(pylon_sprites[PPPpos], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, height, IsTransparencySet(TO_CATENARY), -1, -1);

   420

	}

   421

   422

	/* need a pylon on the southern end of the bridge */

   423

	if (GetTunnelBridgeLength(ti->tile, start) + 1 == length) {

   424

		DiagDirection PCPpos = (axis == AXIS_X ? DIAGDIR_SW : DIAGDIR_SE);

   425

		Direction PPPpos = (axis == AXIS_X ? DIR_NW : DIR_NE);

   426

		if (HasBit(tlg, (axis == AXIS_X ? 0 : 1))) PPPpos = ReverseDir(PPPpos);

   427

		uint x = ti->x + x_pcp_offsets[PCPpos] + x_ppp_offsets[PPPpos];

   428

		uint y = ti->y + y_pcp_offsets[PCPpos] + y_ppp_offsets[PPPpos];

   429

		AddSortableSpriteToDraw(pylon_sprites[PPPpos], PAL_NONE, x, y, 1, 1, BB_HEIGHT_UNDER_BRIDGE, height, IsTransparencySet(TO_CATENARY), -1, -1);

   430

	}

   431

}

   432

   433

void DrawCatenary(const TileInfo *ti)

   434

{

   435

	if (_patches.disable_elrails) return;

   436

   440

	if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile)) {

   441

		TileIndex head = GetNorthernBridgeEnd(ti->tile);

   442

   443

		if (GetTunnelBridgeTransportType(head) == TRANSPORT_RAIL && HasCatenary(GetRailType(head))) {

   444

			DrawCatenaryOnBridge(ti);

   445

		}

   446

	}

   447

   448

	switch (GetTileType(ti->tile)) {

   449

		case MP_RAILWAY:

   450

			if (IsRailDepot(ti->tile)) {

   451

				const SortableSpriteStruct *sss = &CatenarySpriteData_Depot[GetRailDepotDirection(ti->tile)];

   452

   453

				/* This wire is not visible with the default depot sprites */

   454

				AddSortableSpriteToDraw(

   455

					sss->image, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,

   456

					sss->x_size, sss->y_size, sss->z_size,

   457

					GetTileMaxZ(ti->tile) + sss->z_offset,

   458

					IsTransparencySet(TO_CATENARY)

   459

				);

   460

				return;

   461

			}

   462

			break;

   463

   464

		case MP_TUNNELBRIDGE:

   465

		case MP_ROAD:

   466

		case MP_STATION:

   467

			break;

   468

   469

		default: return;

   470

	}

   471

	DrawCatenaryRailway(ti);

   472

}

   473

   474

int32 SettingsDisableElrail(int32 p1)

   475

{

   476

	Vehicle *v;

   477

	Player *p;

   478

	bool disable = (p1 != 0);

   479

   480

	/* we will now walk through all electric train engines and change their railtypes if it is the wrong one*/

   481

	const RailType old_railtype = disable ? RAILTYPE_ELECTRIC : RAILTYPE_RAIL;

   482

	const RailType new_railtype = disable ? RAILTYPE_RAIL : RAILTYPE_ELECTRIC;

   483

   484

	/* walk through all train engines */

   485

	EngineID eid;

   486

	FOR_ALL_ENGINEIDS_OF_TYPE(eid, VEH_TRAIN) {

   487

		RailVehicleInfo *rv_info = &_rail_vehicle_info[eid];

   488

		/* if it is an electric rail engine and its railtype is the wrong one */

   489

		if (rv_info->engclass == 2 && rv_info->railtype == old_railtype) {

   490

			/* change it to the proper one */