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(svn r9617) -Codechange: Implement callback for cargo profit calculation

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peter1138 2007-04-12 19:33:05 +00:00
parent b962cc911d
commit b5b7b489ce
1 changed files with 17 additions and 0 deletions
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17
src/economy.cpp
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@ -1134,6 +1134,23 @@ int32 GetTransportedGoodsIncome(uint num_pieces, uint dist, byte transit_days, C
const CargoSpec *cs = GetCargo(cargo_type);
byte f;
/* Use callback to calculate cargo profit, if available */
if (HASBIT(cs->callback_mask, CBM_CARGO_PROFIT_CALC)) {
uint32 var18 = min(dist, 0xFFFF) | (min(num_pieces, 0xFF) << 16) | (transit_days << 24);
uint16 callback = GetCargoCallback(CBID_CARGO_PROFIT_CALC, 0, var18, cs);
if (callback != CALLBACK_FAILED) {
int result = GB(callback, 0, 14);
/* Simulate a 15 bit signed value */
if (HASBIT(callback, 14)) result = 0x4000 - result;
/* "The result should be a signed multiplier that gets multiplied
* by the amount of cargo moved and the price factor, then gets
* divided by 8192." */
return result * num_pieces * _cargo_payment_rates[cargo_type] / 8192;
}
}
/* zero the distance if it's the bank and very short transport. */
if (_opt.landscape == LT_TEMPERATE && cs->label == 'VALU' && dist < 10)
dist = 0;