New effect: Cars will explode on fire

src/gtasa/effects/custom/vehicle/CarsExplodeOnFireEffect.cpp

@@ -0,0 +1,82 @@
+#include "util/EffectBase.h"
+
+class CarsExplodeOnFireEffect : public EffectBase
+{
+    // give some space for GhostRider to reset to 0
+    static inline const float BURN_TIMER = 4900.0f;
+
+public:
+    void
+    OnTick (EffectInstance *inst) override
+    {
+        for (auto *vehicle : CPools::ms_pVehiclePool)
+        {
+            if (vehicle->m_fHealth < 250.0f)
+            {
+                SetBurnTimer (vehicle, BURN_TIMER);
+            }
+        }
+    }
+
+    void
+    SetBurnTimer (CVehicle *vehicle, float value)
+    {
+        if (!vehicle || !CPools::ms_pVehiclePool->IsObjectValid (vehicle))
+        {
+            return;
+        }
+
+        auto *model = CModelInfo::ms_modelInfoPtrs[vehicle->m_nModelIndex];
+        if (!model) return;
+
+        auto *vehicleModelInfo = reinterpret_cast<CVehicleModelInfo *> (model);
+        if (!vehicleModelInfo) return;
+
+        switch (vehicleModelInfo->m_nVehicleType)
+        {
+            case VEHICLE_BIKE:
+            {
+                CBike *bike = (CBike *) vehicle;
+                if (IsValidTime (bike->m_fBurningTimer))
+                {
+                    bike->m_fBurningTimer = value;
+                }
+                break;
+            }
+            case VEHICLE_AUTOMOBILE:
+            case VEHICLE_MTRUCK:
+            case VEHICLE_QUAD:
+            case VEHICLE_TRAILER:
+            {
+                CAutomobile *automobile = (CAutomobile *) vehicle;
+                if (IsValidTime (automobile->m_fBurningTimer))
+                {
+                    automobile->m_fBurningTimer = value;
+                }
+                break;
+            }
+            case VEHICLE_BOAT:
+            {
+                CBoat *boat = (CBoat *) vehicle;
+                if (IsValidTime (boat->m_fBurningTimer))
+                {
+                    boat->m_fBurningTimer = value;
+                }
+                break;
+            }
+        }
+
+        if (vehicle->m_pTrailer && IsVehiclePointerValid (vehicle->m_pTrailer))
+        {
+            SetBurnTimer (vehicle->m_pTrailer, value);
+        }
+    }
+
+    static bool
+    IsValidTime (float time)
+    {
+        return time >= 0.0f && time < BURN_TIMER;
+    }
+};
+
+DEFINE_EFFECT (CarsExplodeOnFireEffect, "effect_cars_explode_on_fire", 0);