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Feature: [NewGRF] Maximum curve speed modifier for rail vehicles (#9346)

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Vít Šefl
2021-08-15 11:17:05 +02:00
committed by GitHub
parent 579f393374
commit 2183fd4dab
8 changed files with 38 additions and 7 deletions
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8
src/train_cmd.cpp
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@@ -115,6 +115,7 @@ void Train::ConsistChanged(ConsistChangeFlags allowed_changes)
this->compatible_railtypes = RAILTYPES_NONE;
bool train_can_tilt = true;
int min_curve_speed_mod = INT_MAX;
for (Train *u = this; u != nullptr; u = u->Next()) {
const RailVehicleInfo *rvi_u = RailVehInfo(u->engine_type);
@@ -146,6 +147,7 @@ void Train::ConsistChanged(ConsistChangeFlags allowed_changes)
const RailVehicleInfo *rvi_u = &e_u->u.rail;
if (!HasBit(e_u->info.misc_flags, EF_RAIL_TILTS)) train_can_tilt = false;
min_curve_speed_mod = std::min(min_curve_speed_mod, u->GetCurveSpeedModifier());
/* Cache wagon override sprite group. nullptr is returned if there is none */
u->tcache.cached_override = GetWagonOverrideSpriteSet(u->engine_type, u->cargo_type, u->gcache.first_engine);
@@ -229,6 +231,7 @@ void Train::ConsistChanged(ConsistChangeFlags allowed_changes)
/* store consist weight/max speed in cache */
this->vcache.cached_max_speed = max_speed;
this->tcache.cached_tilt = train_can_tilt;
this->tcache.cached_curve_speed_mod = min_curve_speed_mod;
this->tcache.cached_max_curve_speed = this->GetCurveSpeedLimit();
/* recalculate cached weights and power too (we do this *after* the rest, so it is known which wagons are powered and need extra weight added) */
@@ -357,6 +360,11 @@ int Train::GetCurveSpeedLimit() const
/* Apply max_speed bonus of 20% for a tilting train */
max_speed += max_speed / 5;
}
/* Apply max_speed modifier (cached value is fixed-point binary with 8 fractional bits)
* and clamp the result to an acceptable range. */
max_speed += (max_speed * this->tcache.cached_curve_speed_mod) >> 8;
max_speed = Clamp(max_speed, 2, absolute_max_speed);
}
return max_speed;