Files @ r27888:73e8956ac824
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Location: cpp/openttd-patchpack/source/src/saveload/cargopacket_sl.cpp - annotation

Michael Lutz
Feature: [NewGRF] Related Act2 objects for airports and airport tiles.

Airports are similar two stations and industries, both of which have the town as related object.
Airport tiles are similar to industry tiles, which have the industry as related object.
This seems a sensible structure, so let's make it Airport Tile -> Airport -> Town.
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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file cargopacket_sl.cpp Code handling saving and loading of cargo packets */

#include "../stdafx.h"

#include "saveload.h"
#include "compat/cargopacket_sl_compat.h"

#include "../vehicle_base.h"
#include "../station_base.h"

#include "../safeguards.h"

/**
 * Savegame conversion for cargopackets.
 */
/* static */ void CargoPacket::AfterLoad()
{
	if (IsSavegameVersionBefore(SLV_44)) {
		/* If we remove a station while cargo from it is still en route, payment calculation will assume
		 * 0, 0 to be the source of the cargo, resulting in very high payments usually. v->source_xy
		 * stores the coordinates, preserving them even if the station is removed. However, if a game is loaded
		 * where this situation exists, the cargo-source information is lost. in this case, we set the source
		 * to the current tile of the vehicle to prevent excessive profits
		 */
		for (const Vehicle *v : Vehicle::Iterate()) {
			const CargoPacketList *packets = v->cargo.Packets();
			for (VehicleCargoList::ConstIterator it(packets->begin()); it != packets->end(); it++) {
				CargoPacket *cp = *it;
				cp->source_xy = Station::IsValidID(cp->first_station) ? Station::Get(cp->first_station)->xy : v->tile;
			}
		}

		/* Store position of the station where the goods come from, so there
		 * are no very high payments when stations get removed. However, if the
		 * station where the goods came from is already removed, the source
		 * information is lost. In that case we set it to the position of this
		 * station */
		for (Station *st : Station::Iterate()) {
			for (CargoID c = 0; c < NUM_CARGO; c++) {
				GoodsEntry *ge = &st->goods[c];

				const StationCargoPacketMap *packets = ge->cargo.Packets();
				for (StationCargoList::ConstIterator it(packets->begin()); it != packets->end(); it++) {
					CargoPacket *cp = *it;
					cp->source_xy = Station::IsValidID(cp->first_station) ? Station::Get(cp->first_station)->xy : st->xy;
				}
			}
		}
	}

	if (IsSavegameVersionBefore(SLV_120)) {
		/* CargoPacket's source should be either INVALID_STATION or a valid station */
		for (CargoPacket *cp : CargoPacket::Iterate()) {
			if (!Station::IsValidID(cp->first_station)) cp->first_station = INVALID_STATION;
		}
	}

	if (!IsSavegameVersionBefore(SLV_68)) {
		/* Only since version 68 we have cargo packets. Savegames from before used
		 * 'new CargoPacket' + cargolist.Append so their caches are already
		 * correct and do not need rebuilding. */
		for (Vehicle *v : Vehicle::Iterate()) v->cargo.InvalidateCache();

		for (Station *st : Station::Iterate()) {
			for (CargoID c = 0; c < NUM_CARGO; c++) st->goods[c].cargo.InvalidateCache();
		}
	}

	if (IsSavegameVersionBefore(SLV_181)) {
		for (Vehicle *v : Vehicle::Iterate()) v->cargo.KeepAll();
	}
}

/**
 * Wrapper function to get the CargoPacket's internal structure while
 * some of the variables itself are private.
 * @return the saveload description for CargoPackets.
 */
SaveLoadTable GetCargoPacketDesc()
{
	static const SaveLoad _cargopacket_desc[] = {
		SLE_VARNAME(CargoPacket, first_station, "source", SLE_UINT16),
		SLE_VAR(CargoPacket, source_xy,       SLE_UINT32),
		SLE_VAR(CargoPacket, count,           SLE_UINT16),
		SLE_CONDVARNAME(CargoPacket, periods_in_transit, "days_in_transit", SLE_FILE_U8 | SLE_VAR_U16, SL_MIN_VERSION, SLV_MORE_CARGO_AGE),
		SLE_CONDVARNAME(CargoPacket, periods_in_transit, "days_in_transit", SLE_UINT16, SLV_MORE_CARGO_AGE, SLV_PERIODS_IN_TRANSIT_RENAME),
		SLE_CONDVAR(CargoPacket, periods_in_transit, SLE_UINT16, SLV_PERIODS_IN_TRANSIT_RENAME, SL_MAX_VERSION),
		SLE_VAR(CargoPacket, feeder_share,    SLE_INT64),
		SLE_CONDVAR(CargoPacket, source_type,     SLE_UINT8,  SLV_125, SL_MAX_VERSION),
		SLE_CONDVAR(CargoPacket, source_id,       SLE_UINT16, SLV_125, SL_MAX_VERSION),
	};
	return _cargopacket_desc;
}

struct CAPAChunkHandler : ChunkHandler {
	CAPAChunkHandler() : ChunkHandler('CAPA', CH_TABLE) {}

	void Save() const override
	{
		SlTableHeader(GetCargoPacketDesc());

		for (CargoPacket *cp : CargoPacket::Iterate()) {
			SlSetArrayIndex(cp->index);
			SlObject(cp, GetCargoPacketDesc());
		}
	}

	void Load() const override
	{
		const std::vector<SaveLoad> slt = SlCompatTableHeader(GetCargoPacketDesc(), _cargopacket_sl_compat);

		int index;

		while ((index = SlIterateArray()) != -1) {
			CargoPacket *cp = new (index) CargoPacket();
			SlObject(cp, slt);
		}
	}
};

static const CAPAChunkHandler CAPA;
static const ChunkHandlerRef cargopacket_chunk_handlers[] = {
	CAPA,
};

extern const ChunkHandlerTable _cargopacket_chunk_handlers(cargopacket_chunk_handlers);