Add server authoritative fire spread state

Source/AgrarianGame/AgrarianCampfire.cpp

@@ -146,6 +146,7 @@ void AAgrarianCampfire::Tick(float DeltaSeconds)
 		UpdateFireRisk(DeltaSeconds);
 		UpdateVegetationIgnitionRisk(DeltaSeconds);
 		UpdateStructureIgnitionRisk(DeltaSeconds);
+		UpdateServerAuthoritativeFireSpread(DeltaSeconds);
 		WarmNearbyCharacters(DeltaSeconds);
 	}
 }
@@ -169,6 +170,10 @@ void AAgrarianCampfire::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& Ou
 	DOREPLIFETIME(AAgrarianCampfire, bForestFuelIgnited);
 	DOREPLIFETIME(AAgrarianCampfire, StructureIgnitionRiskScore);
 	DOREPLIFETIME(AAgrarianCampfire, bStructureIgnited);
+	DOREPLIFETIME(AAgrarianCampfire, GrassFireIntensity);
+	DOREPLIFETIME(AAgrarianCampfire, ForestFireIntensity);
+	DOREPLIFETIME(AAgrarianCampfire, StructureFireIntensity);
+	DOREPLIFETIME(AAgrarianCampfire, ActiveFireSpreadRadius);
 }
 
 FText AAgrarianCampfire::GetInteractionText_Implementation(const AAgrarianGameCharacter* Interactor) const
@@ -218,6 +223,10 @@ void AAgrarianCampfire::CapturePersistentState_Implementation(UAgrarianPersisten
 	PersistentComponent->NumberState.Add(TEXT("forest_fuel_ignited"), bForestFuelIgnited ? 1.0f : 0.0f);
 	PersistentComponent->NumberState.Add(TEXT("structure_ignition_risk_score"), StructureIgnitionRiskScore);
 	PersistentComponent->NumberState.Add(TEXT("structure_ignited"), bStructureIgnited ? 1.0f : 0.0f);
+	PersistentComponent->NumberState.Add(TEXT("grass_fire_intensity"), GrassFireIntensity);
+	PersistentComponent->NumberState.Add(TEXT("forest_fire_intensity"), ForestFireIntensity);
+	PersistentComponent->NumberState.Add(TEXT("structure_fire_intensity"), StructureFireIntensity);
+	PersistentComponent->NumberState.Add(TEXT("active_fire_spread_radius"), ActiveFireSpreadRadius);
 }
 
 void AAgrarianCampfire::ApplyPersistentState_Implementation(UAgrarianPersistentActorComponent* PersistentComponent)
@@ -243,6 +252,10 @@ void AAgrarianCampfire::ApplyPersistentState_Implementation(UAgrarianPersistentA
 	const float* SavedForestIgnited = PersistentComponent->NumberState.Find(TEXT("forest_fuel_ignited"));
 	const float* SavedStructureIgnitionRisk = PersistentComponent->NumberState.Find(TEXT("structure_ignition_risk_score"));
 	const float* SavedStructureIgnited = PersistentComponent->NumberState.Find(TEXT("structure_ignited"));
+	const float* SavedGrassFireIntensity = PersistentComponent->NumberState.Find(TEXT("grass_fire_intensity"));
+	const float* SavedForestFireIntensity = PersistentComponent->NumberState.Find(TEXT("forest_fire_intensity"));
+	const float* SavedStructureFireIntensity = PersistentComponent->NumberState.Find(TEXT("structure_fire_intensity"));
+	const float* SavedActiveFireSpreadRadius = PersistentComponent->NumberState.Find(TEXT("active_fire_spread_radius"));
 
 	if (SavedFuelSeconds)
 	{
@@ -319,6 +332,26 @@ void AAgrarianCampfire::ApplyPersistentState_Implementation(UAgrarianPersistentA
 		bStructureIgnited = *SavedStructureIgnited > 0.5f;
 	}
 
+	if (SavedGrassFireIntensity)
+	{
+		GrassFireIntensity = FMath::Clamp(*SavedGrassFireIntensity, 0.0f, 100.0f);
+	}
+
+	if (SavedForestFireIntensity)
+	{
+		ForestFireIntensity = FMath::Clamp(*SavedForestFireIntensity, 0.0f, 100.0f);
+	}
+
+	if (SavedStructureFireIntensity)
+	{
+		StructureFireIntensity = FMath::Clamp(*SavedStructureFireIntensity, 0.0f, 100.0f);
+	}
+
+	if (SavedActiveFireSpreadRadius)
+	{
+		ActiveFireSpreadRadius = FMath::Clamp(*SavedActiveFireSpreadRadius, 0.0f, MaxFireSpreadRadius);
+	}
+
 	SetLit(SavedLit && *SavedLit > 0.5f && FuelSeconds > 0.0f);
 }
 
@@ -347,6 +380,10 @@ void AAgrarianCampfire::Extinguish()
 		GrassIgnitionRiskScore = 0.0f;
 		ForestIgnitionRiskScore = 0.0f;
 		StructureIgnitionRiskScore = 0.0f;
+		GrassFireIntensity = 0.0f;
+		ForestFireIntensity = 0.0f;
+		StructureFireIntensity = 0.0f;
+		ActiveFireSpreadRadius = 0.0f;
 		LitDurationSeconds = 0.0f;
 		SecondsSinceMaintenance = 0.0f;
 		SetLit(false);
@@ -728,3 +765,64 @@ float AAgrarianCampfire::GetStructureFuelScoreNearFire() const
 
 	return StructureFuelScore;
 }
+
+void AAgrarianCampfire::UpdateServerAuthoritativeFireSpread(float DeltaSeconds)
+{
+	if (!HasAuthority())
+	{
+		return;
+	}
+
+	const bool bAnyActiveFire = bGrassOrBrushIgnited || bForestFuelIgnited || bStructureIgnited;
+	if (!bAnyActiveFire)
+	{
+		return;
+	}
+
+	const float WeatherMultiplier = GetFireSpreadWeatherMultiplier();
+	const float SuppressionMultiplier = FMath::Clamp(1.0f - FireSuppressionPressure, 0.0f, 1.0f);
+	const float FuelScore = FMath::Max(1.0f, GetActiveBurningFuelScore());
+	const float IntensityDelta = FireSpreadIntensityPerSecond * WeatherMultiplier * SuppressionMultiplier * FuelScore * DeltaSeconds;
+
+	if (bGrassOrBrushIgnited)
+	{
+		GrassFireIntensity = FMath::Clamp(GrassFireIntensity + IntensityDelta, 0.0f, 100.0f);
+	}
+
+	if (bForestFuelIgnited)
+	{
+		ForestFireIntensity = FMath::Clamp(ForestFireIntensity + (IntensityDelta * 0.75f), 0.0f, 100.0f);
+	}
+
+	if (bStructureIgnited)
+	{
+		StructureFireIntensity = FMath::Clamp(StructureFireIntensity + (IntensityDelta * 0.9f), 0.0f, 100.0f);
+	}
+
+	const float TotalIntensity = GrassFireIntensity + ForestFireIntensity + StructureFireIntensity;
+	ActiveFireSpreadRadius = FMath::Clamp(
+		BaseFireSpreadRadius + (TotalIntensity * 12.0f * WeatherMultiplier),
+		0.0f,
+		MaxFireSpreadRadius);
+}
+
+float AAgrarianCampfire::GetFireSpreadWeatherMultiplier() const
+{
+	float Multiplier = GetVegetationIgnitionWeatherMultiplier();
+	if (IsWetWeatherActive())
+	{
+		Multiplier *= 0.5f;
+	}
+
+	return FMath::Max(0.0f, Multiplier);
+}
+
+float AAgrarianCampfire::GetActiveBurningFuelScore() const
+{
+	float GrassFuelScore = 0.0f;
+	float ForestFuelScore = 0.0f;
+	const float VegetationFuelScore = GetVegetationFuelScoreNearFire(GrassFuelScore, ForestFuelScore);
+	const float StructureFuelScore = GetStructureFuelScoreNearFire();
+
+	return FMath::Max(0.0f, VegetationFuelScore + StructureFuelScore);
+}

Source/AgrarianGame/AgrarianCampfire.h

@@ -150,6 +150,30 @@ public:
 	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Agrarian|Fire|Structure", meta = (ClampMin = "0"))
 	float StructureIgnitionRiskPerSecond = 0.08f;
 
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Replicated, Category = "Agrarian|Fire|Spread", meta = (ClampMin = "0", ClampMax = "100"))
+	float GrassFireIntensity = 0.0f;
+
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Replicated, Category = "Agrarian|Fire|Spread", meta = (ClampMin = "0", ClampMax = "100"))
+	float ForestFireIntensity = 0.0f;
+
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Replicated, Category = "Agrarian|Fire|Spread", meta = (ClampMin = "0", ClampMax = "100"))
+	float StructureFireIntensity = 0.0f;
+
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Replicated, Category = "Agrarian|Fire|Spread", meta = (ClampMin = "0"))
+	float ActiveFireSpreadRadius = 0.0f;
+
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Agrarian|Fire|Spread", meta = (ClampMin = "0"))
+	float BaseFireSpreadRadius = 250.0f;
+
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Agrarian|Fire|Spread", meta = (ClampMin = "0"))
+	float MaxFireSpreadRadius = 3500.0f;
+
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Agrarian|Fire|Spread", meta = (ClampMin = "0"))
+	float FireSpreadIntensityPerSecond = 0.18f;
+
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Agrarian|Fire|Spread", meta = (ClampMin = "0"))
+	float FireSuppressionPressure = 0.0f;
+
 	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Agrarian|Fire|Weather", meta = (ClampMin = "1"))
 	float RainFuelDrainMultiplier = 1.5f;
 
@@ -219,4 +243,7 @@ protected:
 	float GetVegetationIgnitionWeatherMultiplier() const;
 	void UpdateStructureIgnitionRisk(float DeltaSeconds);
 	float GetStructureFuelScoreNearFire() const;
+	void UpdateServerAuthoritativeFireSpread(float DeltaSeconds);
+	float GetFireSpreadWeatherMultiplier() const;
+	float GetActiveBurningFuelScore() const;
 };