Function GetCustomStationFoundationRelocation

src/newgrf_station.cpp:646–657

* Resolve the sprites for custom station foundations. * @param statspec Station spec * @param st Station * @param tile Station tile being drawn * @param layout Spritelayout as returned by previous callback * @param edge_info Information about northern tile edges; whether they need foundations or merge into adjacent tile's foundations. * @return First sprite of a set of foundation sprites for

 * @return First sprite of a set of foundation sprites for various slopes, or 0 if default foundations shall be drawn.
 */
SpriteID GetCustomStationFoundationRelocation(const StationSpec *statspec, BaseStation *st, TileIndex tile, uint layout, uint edge_info)
{
	/* callback_param1 == 2 means  we are resolving the foundation sprites. */
	StationResolverObject object(statspec, st, tile, CBID_NO_CALLBACK, 2, layout | (edge_info << 16));

	const auto *group = object.Resolve<ResultSpriteGroup>();
	/* Note: SpriteGroup::Resolve zeroes all registers, so register 0x100 is initialised to 0. (compatibility) */
	uint32_t offset = static_cast<uint32_t>(object.GetRegister(0x100));
	if (group == nullptr || group->num_sprites <= offset) return 0;

	return group->sprite + offset;
}


uint16_t GetStationCallback(CallbackID callback, uint32_t param1, uint32_t param2, const StationSpec *statspec, BaseStation *st, TileIndex tile, std::span<int32_t> regs100)