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(svn r20857) -Fix [FS#3637]: The station with the second highest rating was doubly penalised when distributing cargo. Now the penalty is completely removed and the granularity/precision of the distribution in increased by using fractional cargo. This should make competing stations less "all-or-nothing".

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This commit is contained in:
rubidium 2010-09-28 22:00:24 +00:00
parent 897bb71621
commit b4f6201e94
4 changed files with 30 additions and 24 deletions
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3
src/saveload/saveload.cpp
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@ -212,8 +212,9 @@
* 147 20621
* 148 20659
* 149 20832
* 150 20857
*/
extern const uint16 SAVEGAME_VERSION = 149; ///< current savegame version of OpenTTD
extern const uint16 SAVEGAME_VERSION = 150; ///< current savegame version of OpenTTD
SavegameType _savegame_type; ///< type of savegame we are loading

1
src/saveload/station_sl.cpp
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@ -238,6 +238,7 @@ const SaveLoad *GetGoodsDesc()
SLE_VAR(GoodsEntry, last_age, SLE_UINT8),
SLEG_CONDVAR( _cargo_feeder_share, SLE_FILE_U32 | SLE_VAR_I64, 14, 64),
SLEG_CONDVAR( _cargo_feeder_share, SLE_INT64, 65, 67),
SLE_CONDVAR(GoodsEntry, amount_fract, SLE_UINT8, 150, SL_MAX_VERSION),
SLE_CONDLST(GoodsEntry, cargo.packets, REF_CARGO_PACKET, 68, SL_MAX_VERSION),
SLE_END()

1
src/station_base.h
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@ -42,6 +42,7 @@ struct GoodsEntry {
byte rating;
byte last_speed;
byte last_age;
byte amount_fract; ///< Fractional part of the amount in the cargo list
StationCargoList cargo; ///< The cargo packets of cargo waiting in this station
};

49
src/station_cmd.cpp
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@ -3188,8 +3188,15 @@ void ModifyStationRatingAround(TileIndex tile, Owner owner, int amount, uint rad
}
}
static void UpdateStationWaiting(Station *st, CargoID type, uint amount, SourceType source_type, SourceID source_id)
static uint UpdateStationWaiting(Station *st, CargoID type, uint amount, SourceType source_type, SourceID source_id)
{
amount += st->goods[type].amount_fract;
st->goods[type].amount_fract = GB(amount, 0, 8);
amount >>= 8;
/* No new "real" cargo item yet. */
if (amount == 0) return 0;
st->goods[type].cargo.Append(new CargoPacket(st->index, st->xy, amount, source_type, source_id));
SetBit(st->goods[type].acceptance_pickup, GoodsEntry::PICKUP);
@ -3198,6 +3205,7 @@ static void UpdateStationWaiting(Station *st, CargoID type, uint amount, SourceT
SetWindowDirty(WC_STATION_VIEW, st->index);
st->MarkTilesDirty(true);
return amount;
}
static bool IsUniqueStationName(const char *name)
@ -3328,11 +3336,13 @@ uint MoveGoodsToStation(CargoID type, uint amount, SourceType source_type, Sourc
/* no stations around at all? */
if (st1 == NULL) return 0;
/* From now we'll calculate with fractal cargo amounts.
* First determine how much cargo we really have. */
amount *= best_rating1 + 1;
if (st2 == NULL) {
/* only one station around */
uint moved = amount * best_rating1 / 256 + 1;
UpdateStationWaiting(st1, type, moved, source_type, source_id);
return moved;
return UpdateStationWaiting(st1, type, amount, source_type, source_id);
}
/* several stations around, the best two (highest rating) are in st1 and st2 */
@ -3340,26 +3350,19 @@ uint MoveGoodsToStation(CargoID type, uint amount, SourceType source_type, Sourc
assert(st2 != NULL);
assert(best_rating1 != 0 || best_rating2 != 0);
/* the 2nd highest one gets a penalty */
best_rating2 >>= 1;
/* Then determine the amount the worst station gets. We do it this way as the
* best should get a bonus, which in this case is the rounding difference from
* this calculation. In reality that will mean the bonus will be pretty low.
* Nevertheless, the best station should always get the most cargo regardless
* of rounding issues. */
uint worst_cargo = amount * best_rating2 / (best_rating1 + best_rating2);
assert(worst_cargo <= (amount - worst_cargo));
/* amount given to station 1 */
uint t = (best_rating1 * (amount + 1)) / (best_rating1 + best_rating2);
uint moved = 0;
if (t != 0) {
moved = t * best_rating1 / 256 + 1;
amount -= t;
UpdateStationWaiting(st1, type, moved, source_type, source_id);
}
if (amount != 0) {
amount = amount * best_rating2 / 256 + 1;
moved += amount;
UpdateStationWaiting(st2, type, amount, source_type, source_id);
}
return moved;
/* And then send the cargo to the stations! */
uint moved = UpdateStationWaiting(st1, type, amount - worst_cargo, source_type, source_id);
/* These two UpdateStationWaiting's can't be in the statement as then the order
* of execution would be undefined and that could cause desyncs with callbacks. */
return moved + UpdateStationWaiting(st2, type, worst_cargo, source_type, source_id);
}
void BuildOilRig(TileIndex tile)