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Code Issues 151 Wiki Activity

multiplayer: replicate the machinery you hear, not only the machinery you set

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A bystander heard nothing of somebody else's converter, compressors, brake air
or relays. Two different reasons for that, and they need two different answers.

The devices whose sound runs for as long as they do - the converter, the main
compressor, the pantograph compressor, the releaser - are outputs of a physics
that a peer only half runs for a vehicle it does not own. Their running flags
travel now, alongside the permits that were already going.

The clicks and hisses are a harder case: MoverParameters::SoundFlag is raised
and wiped inside a single frame, so sampling it when an update happens to be
put together would catch almost none of them. They are collected as the vehicle
finishes with them, just before it clears the field, and the accumulation rides
along with the next update. On arrival they are added to whatever the receiving
peer's own physics produced, and its sound handling plays them once and wipes
the lot, exactly as it does for its own.
This commit is contained in:
Hirek
2026-09-07 08:48:30 +00:00
parent d0306f3d4a
commit fb94dcfa2b
3 changed files with 70 additions and 1 deletions
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56
network/snapshot.cpp
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@@ -77,6 +77,9 @@ TTrack *track_by_id(uint32_t const Id)
return (Id < g_trackindex.size() ? g_trackindex[Id] : nullptr);
}
// one-shot sound events seen since the last update went out, per vehicle
std::unordered_map<std::string, int> g_soundevents;
std::unordered_map<std::string, uint64_t> g_lastvehicles;
std::unordered_map<std::string, uint64_t> g_lastmemcells;
std::unordered_map<std::string, int> g_lastswitches;
@@ -210,6 +213,14 @@ struct vehicle_state
// what the vehicle is heard and seen doing. a peer that is not in this cab has no
// TTrain for it, so the commands that set these never reach it - only the result does
int32_t warningsignal{0};
// devices whose sound runs for as long as they do, and the one-shot events - relays
// clicking, air hissing - that happen too fast for an update to catch by sampling
bool converterrunning{false};
bool compressorrunning{false};
bool pantcompressorrunning{false};
bool compressorlock{false};
bool releaser{false};
int32_t soundevents{0};
int32_t emergencywarningsignal{0};
bool alarmchain{false};
double wheelrevolutions{0.0};
@@ -256,6 +267,12 @@ void serialize_vehicle(std::ostream &Stream, vehicle_state const &State)
}
sn_utils::ls_int32(Stream, State.lights[0]);
sn_utils::ls_int32(Stream, State.lights[1]);
sn_utils::s_bool(Stream, State.converterrunning);
sn_utils::s_bool(Stream, State.compressorrunning);
sn_utils::s_bool(Stream, State.pantcompressorrunning);
sn_utils::s_bool(Stream, State.compressorlock);
sn_utils::s_bool(Stream, State.releaser);
sn_utils::ls_int32(Stream, State.soundevents);
sn_utils::ls_int32(Stream, State.warningsignal);
sn_utils::ls_int32(Stream, State.emergencywarningsignal);
sn_utils::s_bool(Stream, State.alarmchain);
@@ -307,6 +324,12 @@ vehicle_state deserialize_vehicle(std::istream &Stream)
}
state.lights[0] = sn_utils::ld_int32(Stream);
state.lights[1] = sn_utils::ld_int32(Stream);
state.converterrunning = sn_utils::d_bool(Stream);
state.compressorrunning = sn_utils::d_bool(Stream);
state.pantcompressorrunning = sn_utils::d_bool(Stream);
state.compressorlock = sn_utils::d_bool(Stream);
state.releaser = sn_utils::d_bool(Stream);
state.soundevents = sn_utils::ld_int32(Stream);
state.warningsignal = sn_utils::ld_int32(Stream);
state.emergencywarningsignal = sn_utils::ld_int32(Stream);
state.alarmchain = sn_utils::d_bool(Stream);
@@ -362,6 +385,15 @@ vehicle_state read_from(TDynamicObject const &Vehicle)
}
state.lights[0] = mover.iLights[0];
state.lights[1] = mover.iLights[1];
state.converterrunning = mover.ConverterFlag;
state.compressorrunning = mover.CompressorFlag;
state.pantcompressorrunning = mover.PantCompFlag;
state.compressorlock = mover.CompressorGovernorLock;
state.releaser = (mover.Hamulec != nullptr && mover.Hamulec->Releaser());
auto const events = g_soundevents.find(Vehicle.name());
state.soundevents = (events != g_soundevents.end() ? events->second : 0);
state.warningsignal = mover.WarningSignal;
state.emergencywarningsignal = mover.EmergencyBrakeWarningSignal;
state.alarmchain = mover.AlarmChainFlag;
@@ -427,6 +459,18 @@ void apply_controls(TDynamicObject &Vehicle, vehicle_state const &State)
// the horn, the wheels and the engine note. these are set from a cab this peer does
// not have, so nothing but the result of them ever reaches it
mover.ConverterFlag = State.converterrunning;
mover.CompressorFlag = State.compressorrunning;
mover.PantCompFlag = State.pantcompressorrunning;
mover.CompressorGovernorLock = State.compressorlock;
if (mover.Hamulec != nullptr && mover.Hamulec->Releaser() != State.releaser)
mover.Hamulec->Releaser(State.releaser ? 1 : 0);
// the one-shot events are added to whatever this peer's own physics produced; the
// vehicle's sound handling plays them once and wipes the lot, as it always does
mover.SoundFlag |= State.soundevents;
mover.WarningSignal = State.warningsignal;
mover.EmergencyBrakeWarningSignal = State.emergencywarningsignal;
mover.AlarmChainFlag = State.alarmchain;
@@ -532,6 +576,9 @@ std::string write_vehicles(bool const Full, bool const OwnedOnly)
entries.write(record.data(), record.size());
++count;
// the one-shot events have been handed over; they must not go out twice
g_soundevents.erase(state.name);
}
if (count == 0)
@@ -827,8 +874,17 @@ void read_switches(std::istream &Stream)
} // namespace
void network::note_sound_events(std::string const &Vehicle, int const Events)
{
if (Events == 0)
return;
g_soundevents[Vehicle] |= Events;
}
void network::reset_snapshot_history()
{
g_soundevents.clear();
g_lastvehicles.clear();
g_lastmemcells.clear();
g_lastswitches.clear();