/**
* Tries to create a cargo subsidy with an industry as source.
* @return True iff the subsidy was created.
*/
bool FindSubsidyIndustryCargoRoute()
{
if (!Subsidy::CanAllocateItem()) return false;
SourceType src_type = ST_INDUSTRY;
/* Select a random industry. */
const Industry *src_ind = Industry::GetRandom();
if (src_ind == NULL) return false;
uint trans, total;
CargoID cid;
/* Randomize cargo type */
if (src_ind->produced_cargo[1] != CT_INVALID && HasBit(Random(), 0)) {
cid = src_ind->produced_cargo[1];
trans = src_ind->last_month_pct_transported[1];
total = src_ind->last_month_production[1];
} else {
cid = src_ind->produced_cargo[0];
trans = src_ind->last_month_pct_transported[0];
total = src_ind->last_month_production[0];
}
/* Quit if no production in this industry
* or if the pct transported is already large enough */
if (total == 0 || trans > SUBSIDY_MAX_PCT_TRANSPORTED || cid == CT_INVALID) return false;
SourceID src = src_ind->index;
return FindSubsidyCargoDestination(cid, src_type, src);
}
/**
* Tries to create a cargo subsidy with a town as source.
* @return True iff the subsidy was created.
*/
bool FindSubsidyTownCargoRoute()
{
if (!Subsidy::CanAllocateItem()) return false;
SourceType src_type = ST_TOWN;
/* Select a random town. */
const Town *src_town = Town::GetRandom();
uint32 town_cargo_produced = src_town->cargo_produced;
/* Passenger subsidies are not handled here. */
ClrBit(town_cargo_produced, CT_PASSENGERS);
/* No cargo produced at all? */
if (town_cargo_produced == 0) return false;
/* Choose a random cargo that is produced in the town. */
uint8 cargo_number = RandomRange(CountBits(town_cargo_produced));
CargoID cid;
FOR_EACH_SET_CARGO_ID(cid, town_cargo_produced) {
if (cargo_number == 0) break;
cargo_number--;
}
/* Avoid using invalid NewGRF cargoes. */
if (!CargoSpec::Get(cid)->IsValid()) return false;
/* Quit if the percentage transported is large enough. */
if (src_town->GetPercentTransported(cid) > SUBSIDY_MAX_PCT_TRANSPORTED) return false;
SourceID src = src_town->index;
return FindSubsidyCargoDestination(cid, src_type, src);
}
/**
* Tries to create a cargo subsidy with an industry as source.
* @return True iff the subsidy was created.
*/
bool FindSubsidyIndustryCargoRoute()
{
if (!Subsidy::CanAllocateItem()) return false;
SourceType src_type = ST_INDUSTRY;
/* Select a random industry. */
const Industry *src_ind = Industry::GetRandom();
if (src_ind == NULL) return false;
uint trans, total;
CargoID cid;
/* Randomize cargo type */
int num_cargos = 0;
uint cargo_index;
for (cargo_index = 0; cargo_index < lengthof(src_ind->produced_cargo); cargo_index++) {
if (src_ind->produced_cargo[cargo_index] != CT_INVALID) num_cargos++;
}
if (num_cargos == 0) return false; // industry produces nothing
int cargo_num = RandomRange(num_cargos) + 1;
for (cargo_index = 0; cargo_index < lengthof(src_ind->produced_cargo); cargo_index++) {
if (src_ind->produced_cargo[cargo_index] != CT_INVALID) cargo_num--;
if (cargo_num == 0) break;
}
assert(cargo_num == 0); // indicates loop didn't break as intended
cid = src_ind->produced_cargo[cargo_index];
trans = src_ind->last_month_pct_transported[cargo_index];
total = src_ind->last_month_production[cargo_index];
/* Quit if no production in this industry
* or if the pct transported is already large enough
* or if the cargo is automatically distributed */
if (total == 0 || trans > SUBSIDY_MAX_PCT_TRANSPORTED ||
cid == CT_INVALID ||
_settings_game.linkgraph.GetDistributionType(cid) != DT_MANUAL) {
return false;
}
SourceID src = src_ind->index;
return FindSubsidyCargoDestination(cid, src_type, src);
}
