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

    68

#include "table/sprites.h"

    69

#include "table/elrail_data.h"

    70

    71

static inline TLG GetTLG(TileIndex t)

    72

{

    73

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

    74

}

    75

    76

/** Finds which Rail Bits are present on a given tile. For bridge tiles,

    77

 * returns track bits under the bridge

    78

 */

    79

static TrackBits GetRailTrackBitsUniversal(TileIndex t, byte *override)

    80

{

    81

	switch (GetTileType(t)) {

    82

		case MP_RAILWAY:

    83

			if (GetRailType(t) != RAILTYPE_ELECTRIC) return TRACK_BIT_NONE;

    84

			switch (GetRailTileType(t)) {

    85

				case RAIL_TILE_NORMAL: case RAIL_TILE_SIGNALS:

    86

					return GetTrackBits(t);

    87

				case RAIL_TILE_WAYPOINT:

    88

					return GetRailWaypointBits(t);

    89

				default:

    90

					return TRACK_BIT_NONE;

    91

			}

    92

			break;

    93

    94

		case MP_TUNNELBRIDGE:

    95

			if (GetRailType(t) != RAILTYPE_ELECTRIC) return TRACK_BIT_NONE;

    96

			if (override != NULL && (IsTunnel(t) || DistanceMax(t, GetOtherBridgeEnd(t)) > 1)) {

    97

				*override = 1 << GetTunnelBridgeDirection(t);

    98

			}

    99

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

   100

   101

		case MP_ROAD:

   102

			if (GetRoadTileType(t) != ROAD_TILE_CROSSING) return TRACK_BIT_NONE;

   103

			if (GetRailType(t) != RAILTYPE_ELECTRIC) return TRACK_BIT_NONE;

   104

			return GetCrossingRailBits(t);

   105

   106

		case MP_STATION:

   107

			if (!IsRailwayStation(t)) return TRACK_BIT_NONE;

   108

			if (GetRailType(t) != RAILTYPE_ELECTRIC) return TRACK_BIT_NONE;

   109

			if (!IsStationTileElectrifiable(t)) return TRACK_BIT_NONE;

   110

			return TrackToTrackBits(GetRailStationTrack(t));

   111

   112

		default:

   113

			return TRACK_BIT_NONE;

   114

	}

   115

}

   116

   117

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

   118

 * @param tile The tile to analyse

   119

 * @param *tileh the tileh

   120

 */

   121

static void AdjustTileh(TileIndex tile, Slope *tileh)

   122

{

   123

	if (IsTileType(tile, MP_TUNNELBRIDGE)) {

   124

		if (IsTunnel(tile)) {

   125

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

   126

		} else if (*tileh != SLOPE_FLAT) {

   127

			*tileh = SLOPE_FLAT;

   128

		} else {

   129

			switch (GetTunnelBridgeDirection(tile)) {

   130

				case DIAGDIR_NE: *tileh = SLOPE_NE; break;

   131

				case DIAGDIR_SE: *tileh = SLOPE_SE; break;

   132

				case DIAGDIR_SW: *tileh = SLOPE_SW; break;

   133

				case DIAGDIR_NW: *tileh = SLOPE_NW; break;

   134

				default: NOT_REACHED();

   135

			}

   136

		}

   137

	}

   138

}

   139

   140

/**

   141

 * Returns the Z position of a Pylon Control Point.

   142

 *

   143

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

   144

 * @param PCPpos The PCP of the tile.

   145

 * @return The Z position of the PCP.

   146

 */

   147

static byte GetPCPElevation(TileIndex tile, DiagDirection PCPpos)

   148

{

   149

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

   150

	 * PCPs are always on a tile edge.

   151

	 *

   152

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

   153

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

   154

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

   155

	 *

   156

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

   157

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

   158

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

   159

	 *

   160

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

   161

	 */

   162

   163

	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));

   164

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

   165

}

   166

   167

/**

   168

 * Draws wires on a tunnel tile

   169

 *

   170

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

   171

 *

   172

 * @param ti The Tileinfo to draw the tile for

   173

 */

   174

void DrawCatenaryOnTunnel(const TileInfo *ti)

   175

{

   176

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

   177

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

   178

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

   179

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

   180

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

   181

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

   182

	};

   183

   184

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

   185

   186

	DiagDirection dir = GetTunnelBridgeDirection(ti->tile);

   187

   188

	const SortableSpriteStruct *sss = &CatenarySpriteData_Tunnel[dir];

   189

	const int *BB_data = _tunnel_wire_BB[dir];

   190

	AddSortableSpriteToDraw(

   191

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

   192

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

   193

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

   194

		IsTransparencySet(TO_BUILDINGS),

   195

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

   196

	);

   197

}

   198

   199

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

   200

 * @param ti The Tileinfo to draw the tile for

   201

 */

   202

static void DrawCatenaryRailway(const TileInfo *ti)

   203

{

   204

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

   205

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

   206

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

   207

	TrackBits trackconfig[TS_END];

   208

	bool isflat[TS_END];

   209

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

   210

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

   211

   212

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

   213

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

   214

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

   215

   216

	TLG tlg = GetTLG(ti->tile);

   217

	byte PCPstatus = 0;

   218

	byte OverridePCP = 0;

   219

	byte PPPpreferred[DIAGDIR_END];

   220

	byte PPPallowed[DIAGDIR_END];

   221

	DiagDirection i;

   222

	Track t;

   223

   224

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

   225

	 * We don't draw a pylon:

   226

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

   227

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

   228

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

   229

	 *    which have no middle tiles */

   230

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

   231

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

   232

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

   233

   234

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

   235

   236

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

   237

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

   238

		Foundation foundation = FOUNDATION_NONE;

   239

		int k;

   240

   241

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

   242

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

   243

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

   244

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

   245

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

   246

   247

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

   248

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

   249

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

   250

   251

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

   252

   253

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

   254

		PPPallowed[i] = AllowedPPPonPCP[i];

   255

   256

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

   257

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

   258

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

   259

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

   260

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

   261

			    IsBridgeTile(neighbour) &&

   262

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

   263

				continue;

   264

			}

   265

   266

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

   267

			 * (TrackSourceTile) */

   268

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

   269

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

   270

				 * of the PCP for preferred/allowed determination*/

   271

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

   272

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

   273

   274

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

   275

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

   276

			}

   277

		}

   278

   279

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

   280

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

   281

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

   282

   283

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

   284

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

   285

   286

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

   287

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

   288

		if (IsBridgeTile(neighbour)) {

   289

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

   290

		}

   291

   292

		ApplyFoundationToSlope(foundation, &tileh[TS_NEIGHBOUR]);

   293

   294

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

   295

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

   296

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

   297

   298

		AdjustTileh(neighbour, &tileh[TS_NEIGHBOUR]);

   299

   300

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

   301

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

   302

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

   303

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

   304

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

   305

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

   306

		}

   307

   308

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

   309

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

   310

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

   311

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

   312

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

   313

   314

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

   315

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

   316

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

   317

   318

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

   319

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

   320

				SetBit(OverridePCP, i);

   321

			}

   322

		}

   323

   324

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

   325

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

   326

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

   327

   328

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

   329

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

   330

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

   331

   332

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

   333

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

   334

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

   335

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

   336

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

   337

					}

   338

   339

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

   340

							GetPCPElevation(ti->tile, i),

   341

							IsTransparencySet(TO_BUILDINGS), -1, -1);

   342

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

   343

				}

   344

			}

   345

		}

   346

	}

   347

   348

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

   349

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

   350

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

   351

   352

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

   353

	}

   354

   355

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

   356

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

   357

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

   358

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

   359

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

   360

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

   361

   362

			const SortableSpriteStruct *sss;

   363

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

   364

   365

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

   366

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

   367

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

   368

   369

			/*

   370

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

   371

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

   372

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

   373

			 */

   374

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

   375

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

   376

				IsTransparencySet(TO_BUILDINGS));

   377

		}

   378

	}

   379

}

   380

   381

static void DrawCatenaryOnBridge(const TileInfo *ti)

   382

{

   383

	TileIndex end = GetSouthernBridgeEnd(ti->tile);

   384

	TileIndex start = GetOtherBridgeEnd(end);

   385

   386

	uint length = GetBridgeLength(start, end);

   387

	uint num = DistanceMax(ti->tile, start);

   388

	uint height;

   389

   390

	const SortableSpriteStruct *sss;

   391

	Axis axis = GetBridgeAxis(ti->tile);

   392

	TLG tlg = GetTLG(ti->tile);

   393

   394

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

   395

   396

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

   397

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

   398

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

   399

		sss = &CatenarySpriteData[WIRE_X_FLAT_BOTH + offset];

   400

	} else {

   401

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

   402

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

   403

	}

   404

   405

	height = GetBridgeHeight(end);

   406

   407

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

   408

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

   409

		IsTransparencySet(TO_BUILDINGS)

   410

	);

   411

   412

	/* Finished with wires, draw pylons */

   413

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

   414

	if (num % 2) {

   415

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

   416

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

   417

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

   418

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

   419

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

   420

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

   421

	}

   422

   423

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

   424

	if (DistanceMax(ti->tile, start) == length) {

   425

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

   426

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

   427

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

   428

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

   429

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

   430

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

   431

	}

   432

}

   433

   434

void DrawCatenary(const TileInfo *ti)

   435

{

   436

	if (_patches.disable_elrails) return;

   437

   438

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

   439

		TileIndex head = GetNorthernBridgeEnd(ti->tile);

   440

   441

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

   442

			DrawCatenaryOnBridge(ti);

   443

		}

   444

	}

   445

   446

	switch (GetTileType(ti->tile)) {

   447

		case MP_RAILWAY:

   448

			if (IsRailDepot(ti->tile)) {

   449

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

   450

   451

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

   452

				AddSortableSpriteToDraw(

   453

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

   454

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

   455

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

   456

					IsTransparencySet(TO_BUILDINGS)

   457

				);

   458

				return;

   459

			}

   460

			break;

   461

   462

		case MP_TUNNELBRIDGE:

   463

		case MP_ROAD:

   464

		case MP_STATION:

   465

			break;

   466

   467

		default: return;

   468

	}

   469

	DrawCatenaryRailway(ti);

   470

}

   471

   472

int32 SettingsDisableElrail(int32 p1)

   473

{

   474

	EngineID e_id;

   475

	Vehicle *v;

   476

	Player *p;

   477

	bool disable = (p1 != 0);

   478

   479

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

   480

	const RailType old_railtype = disable ? RAILTYPE_ELECTRIC : RAILTYPE_RAIL;

   481

	const RailType new_railtype = disable ? RAILTYPE_RAIL : RAILTYPE_ELECTRIC;

   482

   483

	/* walk through all train engines */

   484

	for (e_id = 0; e_id < NUM_TRAIN_ENGINES; e_id++) {

   485

		RailVehicleInfo *rv_info = &_rail_vehicle_info[e_id];

   486

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

   487

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

   488

			/* change it to the proper one */

   489

			rv_info->railtype = new_railtype;

   490

		}

   491