Method GetVariable

src/newgrf_house.cpp:310–454

* @note Used by the resolver to get values for feature 07 deterministic spritegroups. */ virtual */

 * @note Used by the resolver to get values for feature 07 deterministic spritegroups.
 */
/* virtual */ uint32_t HouseScopeResolver::GetVariable(uint8_t variable, [[maybe_unused]] uint32_t parameter, bool &available) const
{
	if (this->tile == INVALID_TILE) {
		/* House does not yet exist, nor is it being planned to exist. Provide some default values instead. */
		switch (variable) {
			case 0x40: return TOWN_HOUSE_COMPLETED | this->view << 2; /* Construction stage. */
			case 0x41: return 0;
			case 0x42: return 0;
			case 0x43: return 0;
			case 0x44: return 0;
			case 0x45: return _generating_world ? 1 : 0;
			case 0x46: return 0;
			case 0x47: return 0;
			case 0x60: return 0;
			case 0x61: return 0;
			case 0x62: return 0;
			case 0x63: return 0;
			case 0x64: return 0;
			case 0x65: return 0;
			case 0x66: return 0xFFFFFFFF; /* Class and ID of nearby house. */
			case 0x67: return 0;

			case 0x7A: return GetBadgeVariableResult(*this->ro.grffile, HouseSpec::Get(this->house_id)->badges, parameter);
		}

		Debug(grf, 1, "Unhandled house variable 0x{:X}", variable);
		available = false;
		return UINT_MAX;
	}

	switch (variable) {
		/* Construction stage. */
		case 0x40: return (IsTileType(this->tile, MP_HOUSE) ? GetHouseBuildingStage(this->tile) : 0) | TileHash2Bit(TileX(this->tile), TileY(this->tile)) << 2;

		/* Building age. */
		case 0x41: return IsTileType(this->tile, MP_HOUSE) ? GetHouseAge(this->tile).base() : 0;

		/* Town zone */
		case 0x42: return to_underlying(GetTownRadiusGroup(this->town, this->tile));

		/* Terrain type */
		case 0x43: return GetTerrainType(this->tile);

		/* Number of this type of building on the map. */
		case 0x44: return GetNumHouses(this->house_id, this->town);

		/* Whether the town is being created or just expanded. */
		case 0x45: return _generating_world ? 1 : 0;

		/* Current animation frame. */
		case 0x46: return IsTileType(this->tile, MP_HOUSE) ? GetAnimationFrame(this->tile) : 0;

		/* Position of the house */
		case 0x47: return TileY(this->tile) << 16 | TileX(this->tile);

		/* Building counts for old houses with id = parameter. */
		case 0x60: return parameter < NEW_HOUSE_OFFSET ? GetNumHouses(parameter, this->town) : 0;