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(svn r2411) - Codechange: Have trains cache stuff like consist power/weight/max speed instead of recalculating it each time.

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- Fix: Station ratings now depends on the max speed of a consist, without being affected by other speed limits from realistic acceleration.
This commit is contained in:
hackykid
2005-06-05 15:37:00 +00:00
parent b30a413cfe
commit e878e4d815
5 changed files with 92 additions and 55 deletions
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126
train_cmd.c
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@@ -28,6 +28,62 @@ static const byte _vehicle_initial_x_fract[4] = {10,8,4,8};
static const byte _vehicle_initial_y_fract[4] = {8,4,8,10};
static const byte _state_dir_table[4] = { 0x20, 8, 0x10, 4 };
/**
* Recalculates the cached weight of a train and its vehicles. Should be called each time the cargo on
* the consist changes.
* @param v First vehicle of the consist.
*/
void TrainCargoChanged(Vehicle *v) {
Vehicle *u;
uint16 weight = 0;
for (u = v; u != NULL; u = u->next) {
const RailVehicleInfo *rvi = RailVehInfo(u->engine_type);
uint16 vweight = 0;
// vehicle weight is the sum of the weight of the vehicle and the wait of its cargo
vweight += rvi->weight;
vweight += (_cargoc.weights[u->cargo_type] * u->cargo_count) / 16;
// consist weight is the sum of the weight of all vehicles in the consist
weight += vweight;
// store vehicle weight in cache
u->u.rail.cached_veh_weight = vweight;
};
// store consist weight in cache
v->u.rail.cached_weight = weight;
}
/**
* Recalculates the cached stuff of a train. Should be called each time a vehicle is added to/removed from
* the consist, and when the game is loaded.
* @param v First vehicle of the consist.
*/
void TrainConsistChanged(Vehicle *v) {
Vehicle *u;
uint16 max_speed = 0xFFFF;
uint32 power = 0;
// recalculate cached weights too
TrainCargoChanged(v);
for (u = v; u != NULL; u = u->next) {
const RailVehicleInfo *rvi = RailVehInfo(u->engine_type);
// power is the sum of the powers of all engines in the consist
power += rvi->power;
// max speed is the minimun of the speed limits of all vehicles in the consist
if (rvi->max_speed != 0)
max_speed = min(rvi->max_speed, max_speed);
};
// store consist weight/max speed in cache
v->u.rail.cached_max_speed = max_speed;
v->u.rail.cached_power = power;
}
/* These two arrays are used for realistic acceleration. XXX: How should they
* be interpreted? */
@@ -164,38 +220,26 @@ static int GetTrainAcceleration(Vehicle *v, bool mode)
}
}
mass = v->u.rail.cached_weight;
power = v->u.rail.cached_power * 746;
max_speed = min(max_speed, v->u.rail.cached_max_speed);
for (u = v; u != NULL; u = u->next) {
const RailVehicleInfo *rvi = RailVehInfo(u->engine_type);
int vmass;
num++;
power += rvi->power * 746; //[W]
drag_coeff += 3;
if (rvi->max_speed != 0)
max_speed = min(rvi->max_speed, max_speed);
if (u->u.rail.track == 0x80)
max_speed = min(61, max_speed);
vmass = rvi->weight; //[t]
vmass += (_cargoc.weights[u->cargo_type] * u->cargo_count) / 16;
mass += vmass; //[t]
if (HASBIT(u->u.rail.flags, VRF_GOINGUP)) {
incl += vmass * 60; //3% slope, quite a bit actually
incl += u->u.rail.cached_veh_weight * 60; //3% slope, quite a bit actually
} else if (HASBIT(u->u.rail.flags, VRF_GOINGDOWN)) {
incl -= vmass * 60;
incl -= u->u.rail.cached_veh_weight * 60;
}
}
// these are shown in the UI
v->u.rail.cached_weight = mass;
v->u.rail.cached_power = power / 746;
v->max_speed = max_speed;
if (v->u.rail.railtype != 2) {
resistance = 13 * mass / 10;
resistance += 60 * num;
@@ -238,32 +282,13 @@ static int GetTrainAcceleration(Vehicle *v, bool mode)
void UpdateTrainAcceleration(Vehicle *v)
{
uint power = 0;
uint max_speed = 5000;
uint weight = 0;
Vehicle *u = v;
assert(v->subtype == TS_Front_Engine);
// compute stuff like max speed, power, and weight.
for (; u != NULL; u = u->next) {
const RailVehicleInfo *rvi = RailVehInfo(u->engine_type);
// power is sum of the power for all engines
power += rvi->power;
// limit the max speed to the speed of the slowest vehicle.
if (rvi->max_speed != 0 && rvi->max_speed <= max_speed)
max_speed = rvi->max_speed;
// weight is the sum of the weight of the wagon and the weight of the cargo.
weight += rvi->weight;
weight += (_cargoc.weights[u->cargo_type] * u->cargo_count) / 16;
}
// these are shown in the UI
v->u.rail.cached_weight = weight;
v->u.rail.cached_power = power;
v->max_speed = max_speed;
weight = v->u.rail.cached_weight;
power = v->u.rail.cached_power;
v->max_speed = v->u.rail.cached_max_speed;
assert(weight != 0);
@@ -605,6 +630,7 @@ int32 CmdBuildRailVehicle(int x, int y, uint32 flags, uint32 p1, uint32 p2)
if (rvi->flags&RVI_MULTIHEAD && (u = AllocateVehicle()) != NULL)
AddRearEngineToMultiheadedTrain(v, u, true);
TrainConsistChanged(v);
UpdateTrainAcceleration(v);
NormalizeTrainVehInDepot(v);
@@ -838,14 +864,18 @@ int32 CmdMoveRailVehicle(int x, int y, uint32 flags, uint32 p1, uint32 p2)
dst->next = src;
}
if (src_head->subtype == TS_Front_Engine)
if (src_head->subtype == TS_Front_Engine) {
TrainConsistChanged(src_head);
UpdateTrainAcceleration(src_head);
}
InvalidateWindow(WC_VEHICLE_DETAILS, src_head->index);
InvalidateWindow(WC_VEHICLE_REFIT, src_head->index);
if (dst_head) {
if (dst_head->subtype == TS_Front_Engine)
if (dst_head->subtype == TS_Front_Engine) {
TrainConsistChanged(dst_head);
UpdateTrainAcceleration(dst_head);
}
InvalidateWindow(WC_VEHICLE_DETAILS, dst_head->index);
/* Update the refit button and window */
InvalidateWindowWidget(WC_VEHICLE_VIEW, dst_head->index, 12);
@@ -999,6 +1029,7 @@ int32 CmdSellRailWagon(int x, int y, uint32 flags, uint32 p1, uint32 p2)
if (first != NULL && first->subtype == TS_Front_Engine) {
InvalidateWindow(WC_VEHICLE_DETAILS, first->index);
InvalidateWindow(WC_VEHICLE_REFIT, first->index);
TrainConsistChanged(first);
UpdateTrainAcceleration(first);
}
@@ -1049,8 +1080,11 @@ int32 CmdSellRailWagon(int x, int y, uint32 flags, uint32 p1, uint32 p2)
}
}
/* 3. If it is still a valid train after selling, update its acceleration */
if ((flags & DC_EXEC) && first != NULL && first->subtype == TS_Front_Engine) UpdateTrainAcceleration(first);
/* 3. If it is still a valid train after selling, update its acceleration and cached values */
if ((flags & DC_EXEC) && first != NULL && first->subtype == TS_Front_Engine) {
TrainConsistChanged(first);
UpdateTrainAcceleration(first);
}
} break;
}
return cost;
@@ -2116,7 +2150,8 @@ static void HandleTrainLoading(Vehicle *v, bool mode)
InvalidateWindow(WC_TRAINS_LIST, v->owner);
MarkTrainDirty(v);
// need to update acceleration since the goods on the train changed.
// need to update acceleration and cached values since the goods on the train changed.
TrainCargoChanged(v);
UpdateTrainAcceleration(v);
}
return;
@@ -2212,6 +2247,7 @@ static void TrainEnterStation(Vehicle *v, StationID station)
if (LoadUnloadVehicle(v) != 0) {
InvalidateWindow(WC_TRAINS_LIST, v->owner);
MarkTrainDirty(v);
TrainCargoChanged(v);
UpdateTrainAcceleration(v);
}
InvalidateWindowWidget(WC_VEHICLE_VIEW, v->index, STATUS_BAR);