Function DrawSingleSignal

src/rail_cmd.cpp:1863–1901

}

static void DrawSingleSignal(TileIndex tile, const RailTypeInfo *rti, Track track, SignalState condition, SignalOffsets image, uint pos)
{
	bool side;
	switch (_settings_game.construction.train_signal_side) {
		case 0:  side = false;                                 break; // left
		case 2:  side = true;                                  break; // right
		default: side = _settings_game.vehicle.road_side != 0; break; // driving side
	}
	static const Point SignalPositions[2][12] = {
		{ // Signals on the left side
		/*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
			{ 8,  5}, {14,  1}, { 1, 14}, { 9, 11}, { 1,  0}, { 3, 10},
		/*  LOWER     LOWER     X         X         Y         Y     */
			{11,  4}, {14, 14}, {11,  3}, { 4, 13}, { 3,  4}, {11, 13}
		}, { // Signals on the right side
		/*  LEFT      LEFT      RIGHT     RIGHT     UPPER     UPPER */
			{14,  1}, {12, 10}, { 4,  6}, { 1, 14}, {10,  4}, { 0,  1},
		/*  LOWER     LOWER     X         X         Y         Y     */
			{14, 14}, { 5, 12}, {11, 13}, { 4,  3}, {13,  4}, { 3, 11}
		}
	};

	uint x = TileX(tile) * TILE_SIZE + SignalPositions[side][pos].x;
	uint y = TileY(tile) * TILE_SIZE + SignalPositions[side][pos].y;

	SignalType type       = GetSignalType(tile, track);
	SignalVariant variant = GetSignalVariant(tile, track);

	SpriteID sprite = GetCustomSignalSprite(rti, tile, type, variant, condition);
	if (sprite != 0) {
		sprite += image;
	} else {
		/* Normal electric signals are stored in a different sprite block than all other signals. */
		sprite = (type == SIGTYPE_BLOCK && variant == SIG_ELECTRIC) ? SPR_ORIGINAL_SIGNALS_BASE : SPR_SIGNALS_BASE - 16;
		sprite += type * 16 + variant * 64 + image * 2 + condition + (type > SIGTYPE_LAST_NOPBS ? 64 : 0);
	}

	AddSortableSpriteToDraw(sprite, PAL_NONE, x, y, GetSaveSlopeZ(x, y, track), {{}, {1, 1, BB_HEIGHT_UNDER_BRIDGE}, {}});
}

/** Offsets for drawing fences */
struct FenceOffset : SpriteBounds {