Function GetRoadFoundation

src/road_cmd.cpp:1288–1308

* Get the foundationtype of a RoadBits Slope combination * * @param tileh The Slope part * @param bits The RoadBits part * @return The resulting Foundation */

 * @return The resulting Foundation
 */
static Foundation GetRoadFoundation(Slope tileh, RoadBits bits)
{
	/* Flat land and land without a road doesn't require a foundation */
	if (tileh == SLOPE_FLAT || bits == ROAD_NONE) return FOUNDATION_NONE;

	/* Steep slopes behave the same as slopes with one corner raised. */
	if (IsSteepSlope(tileh)) {
		tileh = SlopeWithOneCornerRaised(GetHighestSlopeCorner(tileh));
	}

	/* Leveled RoadBits on a slope */
	if ((_invalid_tileh_slopes_road[0][tileh] & bits) == ROAD_NONE) return FOUNDATION_LEVELED;

	/* Straight roads without foundation on a slope */
	if (!IsSlopeWithOneCornerRaised(tileh) &&
			(_invalid_tileh_slopes_road[1][tileh] & bits) == ROAD_NONE)
		return FOUNDATION_NONE;

	/* Roads on steep Slopes or on Slopes with one corner raised */
	return (bits == ROAD_X ? FOUNDATION_INCLINED_X : FOUNDATION_INCLINED_Y);
}

const uint8_t _road_sloped_sprites[14] = {
	0,  0,  2,  0,