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 "tile.h"

    52

#include "viewport.h"

    53

#include "functions.h" /* We should REALLY get rid of this goddamn file, as it is butt-ugly */

    54

#include "variables.h" /* ... same here */

    55

#include "landscape.h"

    56

#include "rail.h"

    57

#include "debug.h"

    58

#include "tunnel_map.h"

    59

#include "road_map.h"

    60

#include "bridge_map.h"

    61

#include "bridge.h"

    62

#include "rail_map.h"

    63

#include "table/sprites.h"

    64

#include "table/elrail_data.h"

    65

#include "vehicle.h"

    66

#include "train.h"

    67

#include "gui.h"

    68

#include "transparency.h"

    69

    70

static inline TLG GetTLG(TileIndex t)

    71

{

    72

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

    73

}

    74

    75

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

    76

 * returns track bits under the bridge

    77

 */

    78

static TrackBits GetRailTrackBitsUniversal(TileIndex t, byte *override)

    79

{

    80

	switch (GetTileType(t)) {

    81

		case MP_RAILWAY:

    82

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

    83

			switch (GetRailTileType(t)) {

    84

				case RAIL_TILE_NORMAL: case RAIL_TILE_SIGNALS:

    85

					return GetTrackBits(t);

    86

				case RAIL_TILE_WAYPOINT:

    87

					return GetRailWaypointBits(t);

    88

				default:

    89

					return TRACK_BIT_NONE;

    90

			}

    91

			break;

    92

    93

		case MP_TUNNELBRIDGE:

    94

			if (IsTunnel(t)) {

    95

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

    96

				if (override != NULL) *override = 1 << GetTunnelDirection(t);

    97

				return AxisToTrackBits(DiagDirToAxis(GetTunnelDirection(t)));

    98

			} else {

    99

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

   100

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

   101

					*override = 1 << GetBridgeRampDirection(t);

   102

				}

   103

				return AxisToTrackBits(DiagDirToAxis(GetBridgeRampDirection(t)));

   104

			}

   105

   106

		case MP_ROAD:

   107

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

   108

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

   109

			return GetCrossingRailBits(t);

   110

   111

		case MP_STATION:

   112

			if (!IsRailwayStation(t)) return TRACK_BIT_NONE;

   113

			if (GetRailType(t) != RAILTYPE_ELECTRIC) 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

			switch (GetBridgeRampDirection(tile)) {

   135

				case DIAGDIR_NE: *tileh = SLOPE_NE; break;

   136

				case DIAGDIR_SE: *tileh = SLOPE_SE; break;

   137

				case DIAGDIR_SW: *tileh = SLOPE_SW; break;

   138

				case DIAGDIR_NW: *tileh = SLOPE_NW; break;

   139

				default: NOT_REACHED();

   140

			}

   141

		}

   142

	}

   143

}

   144

   145

/**

   146

 * Returns the Z position of a Pylon Control Point.

   147

 *

   148

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

   149

 * @param PCPpos The PCP of the tile.

   150

 * @return The Z position of the PCP.

   151

 */

   152

static byte GetPCPElevation(TileIndex tile, DiagDirection PCPpos)

   153

{

   154

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

   155

	 * PCPs are always on a tile edge.

   156

	 *

   157

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

   158

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

   159

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

   160

	 *

   161

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

   162

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

   163

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

   164

	 *

   165

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

   166

	 */

   167

   168

	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));

   169

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

   170

}

   171

   172

/**

   173

 * Draws wires on a tunnel tile

   174

 *

   175

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

   176

 *

   177

 * @param ti The Tileinfo to draw the tile for

   178

 */

   179

void DrawCatenaryOnTunnel(const TileInfo *ti)

   180

{

   181

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

   182

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

   183

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

   184

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

   185

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

   186

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

   187

	};

   188

   189

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

   190

   191

	DiagDirection dir = GetTunnelDirection(ti->tile);

   192

   193

	const SortableSpriteStruct *sss = &CatenarySpriteData_Tunnel[dir];

   194

	const int *BB_data = _tunnel_wire_BB[dir];

   195

	AddSortableSpriteToDraw(

   196

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

   197

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

   198

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

   199

		IsTransparencySet(TO_BUILDINGS),

   200

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

   201

	);

   202

}

   203

   204

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

   205

 * @param ti The Tileinfo to draw the tile for

   206

 */

   207

static void DrawCatenaryRailway(const TileInfo *ti)

   208

{

   209

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

   210

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

   211

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

   212

	TrackBits trackconfig[TS_END];

   213

	bool isflat[TS_END];

   214

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

   215

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

   216

   217

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

   218

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

   219

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

   220

   221

	TLG tlg = GetTLG(ti->tile);

   222

	byte PCPstatus = 0;

   223

	byte OverridePCP = 0;

   224

	byte PPPpreferred[DIAGDIR_END];

   225

	byte PPPallowed[DIAGDIR_END];

   226

	DiagDirection i;

   227

	Track t;

   228

   229

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

   230

	 * We don't draw a pylon:

   231

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

   232

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

   233

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

   234

	 *    which have no middle tiles */

   235

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

   236

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

   237

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

   238

   239

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

   240

   241

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

   242

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

   243

		Foundation foundation = FOUNDATION_NONE;

   244

		int k;

   245

   246

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

   247

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

   248

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

   249

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

   250

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

   251

   252

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

   253

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

   254

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

   255

   256

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

   257

   258

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

   259

		PPPallowed[i] = AllowedPPPonPCP[i];

   260

   261

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

   262

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

   263

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

   264

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

   265

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

   266

			    IsBridgeTile(neighbour) &&

   267

			    GetBridgeRampDirection(neighbour) == ReverseDiagDir(i)) {

   268

				continue;

   269

			}

   270

   271

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

   272

			 * (TrackSourceTile) */

   273

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

   274

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

   275

				 * of the PCP for preferred/allowed determination*/

   276

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

   277

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

   278

   279

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

   280

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

   281

			}

   282

		}

   283

   284

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

   285

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

   286

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

   287

   288

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

   289

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

   290

   291

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

   292

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

   293

		if (IsBridgeTile(neighbour)) {

   294

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

   295

		}

   296

   297

		ApplyFoundationToSlope(foundation, &tileh[TS_NEIGHBOUR]);

   298

   299

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

   300

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

   301

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

   302

   303

		AdjustTileh(neighbour, &tileh[TS_NEIGHBOUR]);

   304

   305

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

   306

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

   307

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

   308

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

   309

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

   310

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

   311

		}

   312

   313

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

   314

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

   315

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

   316

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

   317

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

   318

   319

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

   320

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

   321

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

   322

   323

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

   324

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

   325

				SETBIT(OverridePCP, i);

   326

			}

   327

		}

   328

   329

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

   330

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

   331

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

   332

   333

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

   334

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

   335

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

   336

   337

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

   338

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

   339

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

   340

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

   341

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

   342

					}

   343

   344

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

   345

							GetPCPElevation(ti->tile, i),

   346

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

   347

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

   348

				}

   349

			}

   350

		}

   351

	}

   352

   353

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

   354

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

   355

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

   356

   357

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

   358

	}

   359

   360

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

   361

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

   362

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

   363

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

   364

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

   365

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

   366

   367

			const SortableSpriteStruct *sss;

   368

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

   369

   370

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

   371

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

   372

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

   373

   374

			/*

   375

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

   376

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

   377

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

   378

			 */

   379

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

   380

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

   381

				IsTransparencySet(TO_BUILDINGS));

   382

		}

   383

	}

   384

}

   385

   386

static void DrawCatenaryOnBridge(const TileInfo *ti)

   387

{

   388

	TileIndex end = GetSouthernBridgeEnd(ti->tile);

   389

	TileIndex start = GetOtherBridgeEnd(end);

   390

   391

	uint length = GetBridgeLength(start, end);

   392

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

   393

	uint height;

   394

   395

	const SortableSpriteStruct *sss;

   396

	Axis axis = GetBridgeAxis(ti->tile);

   397

	TLG tlg = GetTLG(ti->tile);

   398

   399

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

   400

   401

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

   402

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

   403

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

   404

		sss = &CatenarySpriteData[WIRE_X_FLAT_BOTH + offset];

   405

	} else {

   406

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

   407

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

   408

	}

   409

   410

	height = GetBridgeHeight(end);

   411

   412

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

   413

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

   414

		IsTransparencySet(TO_BUILDINGS)

   415

	);

   416

   417

	/* Finished with wires, draw pylons */

   418

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

   419

	if (num % 2) {

   420

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

   421

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

   422

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

   423

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

   424

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

   425

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

   426

	}

   427

   428

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

   429

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

   430

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

   431

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

   432

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

   433

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

   434

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

   435

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

   436

	}

   437

}

   438

   439

void DrawCatenary(const TileInfo *ti)

   440

{

   441

	if (_patches.disable_elrails) return;

   442

   443

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

   444

		TileIndex head = GetNorthernBridgeEnd(ti->tile);

   445

   446

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

   447

			DrawCatenaryOnBridge(ti);

   448

		}

   449

	}

   450

   451

	switch (GetTileType(ti->tile)) {

   452

		case MP_RAILWAY:

   453

			if (IsRailDepot(ti->tile)) {

   454

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

   455

   456

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

   457

				AddSortableSpriteToDraw(

   458

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

   459

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

   460

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

   461

					IsTransparencySet(TO_BUILDINGS)

   462

				);

   463

				return;

   464

			}

   465

			break;

   466

   467

		case MP_TUNNELBRIDGE:

   468

		case MP_ROAD:

   469

		case MP_STATION:

   470

			break;

   471

   472

		default: return;

   473

	}

   474

	DrawCatenaryRailway(ti);

   475

}

   476

   477

int32 SettingsDisableElrail(int32 p1)

   478

{

   479

	EngineID e_id;

   480

	Vehicle *v;

   481

	Player *p;

   482

	bool disable = (p1 != 0);

   483

   484

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

   485

	const RailType old_railtype = disable ? RAILTYPE_ELECTRIC : RAILTYPE_RAIL;

   486

	const RailType new_railtype = disable ? RAILTYPE_RAIL : RAILTYPE_ELECTRIC;

   487

   488

	/* walk through all train engines */

   489

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

   490

		RailVehicleInfo *rv_info = &_rail_vehicle_info[e_id];

   491

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

   492

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

   493

			/* change it to the proper one */