void FNiagaraSimulation::Tick(float DeltaSeconds)
{
SCOPE_CYCLE_COUNTER(STAT_NiagaraTick);
SimpleTimer TickTime;
UNiagaraEmitterProperties* PinnedProps = Props.Get();
if (!PinnedProps || !bIsEnabled || TickState == NTS_Suspended || TickState == NTS_Dead)
{
return;
}
Age += DeltaSeconds;
check(Data.GetNumVariables() > 0);
check(PinnedProps->SpawnScriptProps.Script);
check(PinnedProps->UpdateScriptProps.Script);
TickEvents(DeltaSeconds);
// Figure out how many we will spawn.
int32 OrigNumParticles = Data.GetNumInstances();
int32 NumToSpawn = CalcNumToSpawn(DeltaSeconds);
int32 MaxNewParticles = OrigNumParticles + NumToSpawn;
Data.Allocate(MaxNewParticles);
ExternalConstants.SetOrAdd(BUILTIN_CONST_EMITTERAGE, FVector4(Age, Age, Age, Age));
ExternalConstants.SetOrAdd(BUILTIN_CONST_DELTATIME, FVector4(DeltaSeconds, DeltaSeconds, DeltaSeconds, DeltaSeconds));
// Simulate particles forward by DeltaSeconds.
if (TickState==NTS_Running || TickState==NTS_Dieing)
{
SCOPE_CYCLE_COUNTER(STAT_NiagaraSimulate);
RunVMScript(PinnedProps->UpdateScriptProps, EUnusedAttributeBehaviour::PassThrough);
}
//Init new particles with the spawn script.
if (TickState==NTS_Running)
{
SCOPE_CYCLE_COUNTER(STAT_NiagaraSpawn);
Data.SetNumInstances(MaxNewParticles);
//For now, zero any unused attributes here. But as this is really uninitialized data we should maybe make this a more serious error.
RunVMScript(PinnedProps->SpawnScriptProps, EUnusedAttributeBehaviour::Zero, OrigNumParticles, NumToSpawn);
if (bGenerateSpawnEvents)
{
SpawnEventGenerator.OnSpawned(OrigNumParticles, NumToSpawn);
}
}
CPUTimeMS = TickTime.GetElapsedMilliseconds();
INC_DWORD_STAT_BY(STAT_NiagaraNumParticles, Data.GetNumInstances());
}
void FNiagaraSimulation::Tick(float DeltaSeconds)
{
SCOPE_CYCLE_COUNTER(STAT_NiagaraTick);
UNiagaraEmitterProperties* PinnedProps = Props.Get();
if (!PinnedProps || !bIsEnabled || TickState==NTS_Suspended || TickState==NTS_Dead)
return;
SimpleTimer TickTime;
check(Data.GetNumVariables() > 0);
check(PinnedProps->SpawnScriptProps.Script);
check(PinnedProps->UpdateScriptProps.Script);
//Handle Event Actions.
auto CallEventActions = [&](FNiagaraEventReceiverProperties& Receiver)
{
for (auto& Action : Receiver.EmitterActions)
{
if (Action)
Action->PerformAction(*this, Receiver);
}
};
for (auto& Receiver : Props->SpawnScriptProps.EventReceivers) { CallEventActions(Receiver); }
for (auto& Receiver : Props->UpdateScriptProps.EventReceivers) { CallEventActions(Receiver); }
int32 OrigNumParticles = Data.GetNumInstances();
int32 NumToSpawn = 0;
// Figure out how many we will spawn.
NumToSpawn = CalcNumToSpawn(DeltaSeconds);
int32 MaxNewParticles = OrigNumParticles + NumToSpawn;
Data.Allocate(MaxNewParticles);
Age += DeltaSeconds;
Constants.SetOrAdd(TEXT("Emitter Age"), FVector4(Age, Age, Age, Age));
Constants.SetOrAdd(TEXT("Delta Time"), FVector4(DeltaSeconds, DeltaSeconds, DeltaSeconds, DeltaSeconds));
// Simulate particles forward by DeltaSeconds.
if (TickState==NTS_Running || TickState==NTS_Dieing)
{
SCOPE_CYCLE_COUNTER(STAT_NiagaraSimulate);
RunVMScript(PinnedProps->UpdateScriptProps, EUnusedAttributeBehaviour::Copy);
}
DebuggerHook_PreSpawn(this, OrigNumParticles, NumToSpawn);
//Init new particles with the spawn script.
if (TickState==NTS_Running)
{
SCOPE_CYCLE_COUNTER(STAT_NiagaraSpawn);
Data.SetNumInstances(MaxNewParticles);
//For now, zero any unused attributes here. But as this is really uninitialized data we should maybe make this a more serious error.
RunVMScript(PinnedProps->SpawnScriptProps, EUnusedAttributeBehaviour::Zero, OrigNumParticles, NumToSpawn);
}
if (bGenerateSpawnEvents)
{
SpawnEventGenerator.OnSpawned(OrigNumParticles, NumToSpawn);
}
CPUTimeMS = TickTime.GetElapsedMilliseconds();
INC_DWORD_STAT_BY(STAT_NiagaraNumParticles, Data.GetNumInstances());
}
void FNiagaraSimulation::Tick(float DeltaSeconds)
{
SCOPE_CYCLE_COUNTER(STAT_NiagaraTick);
if (!bIsEnabled || TickState==NTS_Suspended || TickState==NTS_Dead)
return;
SimpleTimer TickTime;
check(Data.GetNumAttributes() > 0);
check(Props->SpawnScript);
check(Props->UpdateScript);
// Cache the ComponentToWorld transform.
// CachedComponentToWorld = Component.GetComponentToWorld();
Data.SwapBuffers();
Data.SetNumParticles(Data.GetPrevNumParticles());
int32 OrigNumParticles = Data.GetNumParticles();
int32 NumToSpawn = 0;
// Figure out how many we will spawn.
NumToSpawn = CalcNumToSpawn(DeltaSeconds);
int32 MaxNewParticles = OrigNumParticles + NumToSpawn;
Data.Allocate(MaxNewParticles);
Age += DeltaSeconds;
Constants.SetOrAdd(TEXT("Emitter Age"), FVector4(Age, Age, Age, Age));
Constants.SetOrAdd(TEXT("Delta Time"), FVector4(DeltaSeconds, DeltaSeconds, DeltaSeconds, DeltaSeconds));
// Simulate particles forward by DeltaSeconds.
if (TickState==NTS_Running || TickState==NTS_Dieing)
{
SCOPE_CYCLE_COUNTER(STAT_NiagaraSimulate);
RunVMScript(Props->UpdateScript, EUnusedAttributeBehaviour::Copy);
}
//Init new particles with the spawn script.
if (TickState==NTS_Running)
{
SCOPE_CYCLE_COUNTER(STAT_NiagaraSpawn);
Data.SetNumParticles(MaxNewParticles);
//For now, zero any unused attributes here. But as this is really uninitialized data we should maybe make this a more serious error.
RunVMScript(Props->SpawnScript, EUnusedAttributeBehaviour::Zero, OrigNumParticles, NumToSpawn);
}
// Iterate over looking for dead particles and move from the end of the list to the dead location, compacting in the process
{
SCOPE_CYCLE_COUNTER(STAT_NiagaraKill);
int32 CurNumParticles = OrigNumParticles = Data.GetNumParticles();
int32 ParticleIndex = 0;
const FVector4* ParticleRelativeTimes = Data.GetAttributeData(FNiagaraVariableInfo(FName(TEXT("Age")), ENiagaraDataType::Vector));
if (ParticleRelativeTimes)
{
while (ParticleIndex < OrigNumParticles)
{
if (ParticleRelativeTimes[ParticleIndex].X > 1.0f)
{
// Particle is dead, move one from the end here.
MoveParticleToIndex(--CurNumParticles, ParticleIndex);
}
ParticleIndex++;
}
}
Data.SetNumParticles(CurNumParticles);
// check if the emitter has officially died
if (GetTickState() == NTS_Dieing && CurNumParticles == 0)
{
SetTickState(NTS_Dead);
}
}
CPUTimeMS = TickTime.GetElapsedMilliseconds();
DECLARE_DWORD_COUNTER_STAT(TEXT("NumParticles"), STAT_NiagaraNumParticles, STATGROUP_Niagara);
INC_DWORD_STAT_BY(STAT_NiagaraNumParticles, Data.GetNumParticles());
}
