Function DrawTile_Road

src/road_cmd.cpp:1706–1892

Tile callback function for rendering a road tile to the screen */

/** Tile callback function for rendering a road tile to the screen */
static void DrawTile_Road(TileInfo *ti)
{
	BridgePillarFlags blocked_pillars{};
	switch (GetRoadTileType(ti->tile)) {
		case RoadTileType::Normal:
			DrawRoadBits(ti);

			if (IsBridgeAbove(ti->tile)) {
				RoadBits bits = GetAllRoadBits(ti->tile);
				if ((bits & ROAD_NE) != 0) blocked_pillars.Set(BridgePillarFlag::EdgeNE);
				if ((bits & ROAD_SE) != 0) blocked_pillars.Set(BridgePillarFlag::EdgeSE);
				if ((bits & ROAD_SW) != 0) blocked_pillars.Set(BridgePillarFlag::EdgeSW);
				if ((bits & ROAD_NW) != 0) blocked_pillars.Set(BridgePillarFlag::EdgeNW);
			}
			break;

		case RoadTileType::Crossing: {
			if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, FOUNDATION_LEVELED);

			Axis axis = GetCrossingRailAxis(ti->tile);

			const RailTypeInfo *rti = GetRailTypeInfo(GetRailType(ti->tile));

			RoadType road_rt = GetRoadTypeRoad(ti->tile);
			RoadType tram_rt = GetRoadTypeTram(ti->tile);
			const RoadTypeInfo *road_rti = road_rt == INVALID_ROADTYPE ? nullptr : GetRoadTypeInfo(road_rt);
			const RoadTypeInfo *tram_rti = tram_rt == INVALID_ROADTYPE ? nullptr : GetRoadTypeInfo(tram_rt);

			PaletteID pal = PAL_NONE;

			/* Draw base ground */
			if (rti->UsesOverlay()) {
				SpriteID image = SPR_ROAD_Y + axis;

				Roadside roadside = GetRoadside(ti->tile);
				if (DrawRoadAsSnowOrDesert(IsOnSnowOrDesert(ti->tile), roadside)) {
					image += 19;
				} else {
					switch (roadside) {
						case Roadside::Barren:
							pal = PALETTE_TO_BARE_LAND;
							break;

						case Roadside::Grass:
							break;

						default:
							image -= 19;
							break; // Paved
					}
				}

				DrawGroundSprite(image, pal);
			} else {
				SpriteID image = rti->base_sprites.crossing + axis;
				if (IsCrossingBarred(ti->tile)) image += 2;

				Roadside roadside = GetRoadside(ti->tile);