Impossible to stop helicopter rotor if it has a driver (PR #3621, Fixes

#552)

Client/game_sa/CHeliSA.h

@@ -16,40 +16,37 @@
 class CHeliSAInterface : public CAutomobileSAInterface
 {
 public:
-    std::uint8_t m_heliFlags;
-
-    std::uint8_t _pad1[3];
-    std::uint32_t m_leftRightSkid;
-    std::uint32_t m_steeringUpDown;
-    std::uint32_t m_steeringLeftRight;
-    std::uint32_t m_accelerationBreakStatus;
-    std::uint32_t field_99C;
-    std::uint32_t m_rotorZ;
-    std::uint32_t m_secondRotorZ;
-    std::uint32_t m_maxAltitude;
-    std::uint32_t field_9AC;
-    std::uint32_t m_minAltitude;
-    std::uint32_t field_9B4;
-    std::uint8_t field_9B8;
-    std::uint8_t m_numSwatOccupants;
-    std::uint8_t m_swatIDs[4];
-
-    std::uint8_t _pad2[2];
-    std::uint32_t field_9C0[4];
-    std::uint32_t field_9D0;
-
-    std::uint32_t m_particlesList;
-    std::uint8_t field_9D8[24];
-    std::uint32_t field_9F0;
-    CVector m_searchLightTarget;
-    std::uint32_t m_searchLightIntensity;
-    std::uint32_t field_A04;
-    std::uint32_t field_A08;
-    std::uint32_t m_gunflashFx;
-    std::uint8_t m_firingMultiplier;
-    std::uint8_t m_searchLightEnabled;
-    std::uint8_t _pad3[2];
-    std::uint32_t field_A14;
+    std::uint8_t  m_nHeliFlags;                          // 0x988
+    std::uint8_t  ___pad1[3];                            // 0x989
+    float         m_fLeftRightSkid;                      // 0x98C
+    float         m_fSteeringUpDown;                     // 0x990
+    float         m_fSteeringLeftRight;                  // 0x994
+    float         m_fAccelerationBreakStatus;            // 0x998
+    std::int32_t  field_99C;                             // 0x99C
+    float         m_fRotorZ;                             // 0x9A0
+    float         m_fSecondRotorZ;                       // 0x9A4
+    float         m_fMaxAltitude;                        // 0x9A8
+    std::int32_t  field_9AC;                             // 0x9AC
+    float         m_fMinAltitude;                        // 0x9B0
+    std::int32_t  field_9B4;                             // 0x9B4
+    std::uint8_t  field_9B8;                             // 0x9B8
+    std::uint8_t  m_nNumSwatOccupants;                   // 0x9B9
+    std::uint8_t  m_anSwatIDs[4];                        // 0x9BA
+    std::uint8_t  ___pad2[2];                            // 0x9BE
+    std::uint32_t field_9C0[4];                          // 0x9C0
+    std::int32_t  field_9D0;                             // 0x9D0
+    FxSystem_c**  m_pParticlesList;                      // 0x9D4
+    std::uint8_t  field_9D8[24];                         // 0x9D8
+    std::int32_t  field_9F0;                             // 0x9F0
+    CVector       m_vecSearchLightTarget;                // 0x9F4
+    float         m_fSearchLightIntensity;               // 0xA00
+    std::int32_t  field_A04;                             // 0xA04
+    std::int32_t  field_A08;                             // 0xA08
+    FxSystem_c**  m_ppGunflashFx;                        // 0xA0C
+    std::uint8_t  m_nFiringMultiplier;                   // 0xA10
+    bool          m_bSearchLightEnabled;                 // 0xA11
+    std::uint8_t  ___pad3[2];                            // 0xA12
+    std::int32_t  field_A14;                             // 0xA14
 };
 static_assert(sizeof(CHeliSAInterface) == 0xA18, "Invalid size for CHeliSAInterface");
 

Client/game_sa/CVehicleSA.cpp

@@ -20,6 +20,7 @@
 #include "CProjectileInfoSA.h"
 #include "CTrainSA.h"
 #include "CPlaneSA.h"
+#include "CHeliSA.h"
 #include "CVehicleSA.h"
 #include "CBoatSA.h"
 #include "CVisibilityPluginsSA.h"
@@ -52,6 +53,62 @@ void _declspec(naked) HOOK_Vehicle_PreRender(void)
     }
 }
 
+static bool __fastcall CanProcessFlyingCarStuff(CAutomobileSAInterface* vehicleInterface)
+{
+    SClientEntity<CVehicleSA>* vehicle = pGame->GetPools()->GetVehicle((DWORD*)vehicleInterface);
+    if (!vehicle || !vehicle->pEntity)
+        return true;
+
+    return vehicle->pEntity->GetVehicleRotorState();
+}
+
+static constexpr DWORD CONTINUE_CHeli_ProcessFlyingCarStuff = 0x6C4E82;
+static constexpr DWORD RETURN_CHeli_ProcessFlyingCarStuff = 0x6C5404;
+static void _declspec(naked) HOOK_CHeli_ProcessFlyingCarStuff()
+{
+    _asm
+    {
+        mov esi, ecx
+        mov al, [esi+36h]
+
+        pushad
+        call CanProcessFlyingCarStuff
+        test al, al
+        jz skip
+
+        popad
+        jmp CONTINUE_CHeli_ProcessFlyingCarStuff
+
+        skip:
+        popad
+        jmp RETURN_CHeli_ProcessFlyingCarStuff
+    }
+}
+
+static constexpr DWORD CONTINUE_CPlane_ProcessFlyingCarStuff = 0x6CB7D7;
+static constexpr DWORD RETURN_CPlane_ProcessFlyingCarStuff = 0x6CC482;
+static void _declspec(naked) HOOK_CPlane_ProcessFlyingCarStuff()
+{
+    _asm
+    {
+        push esi
+        mov esi, ecx
+        fnstsw ax
+
+        pushad
+        call CanProcessFlyingCarStuff
+        test al, al
+        jz skip
+
+        popad
+        jmp CONTINUE_CPlane_ProcessFlyingCarStuff
+
+        skip:
+        popad
+        jmp RETURN_CPlane_ProcessFlyingCarStuff
+    }
+}
+
 namespace
 {
     bool ClumpDumpCB(RpAtomic* pAtomic, void* data)
@@ -491,6 +548,29 @@ void CVehicleSA::SetTrainSpeed(float fSpeed)
     pInterface->m_fTrainSpeed = fSpeed;
 }
 
+float CVehicleSA::GetHeliRotorSpeed() const
+{
+    return static_cast<CHeliSAInterface*>(m_pInterface)->m_wheelSpeed[1];
+}
+
+void CVehicleSA::SetHeliRotorSpeed(float speed)
+{
+    static_cast<CHeliSAInterface*>(GetInterface())->m_wheelSpeed[1] = speed;
+}
+
+void CVehicleSA::SetVehicleRotorState(bool state, bool stopRotor, bool isHeli) noexcept
+{
+    m_rotorState = state;
+
+    if (state || !stopRotor)
+        return;
+
+    if (isHeli)
+        SetHeliRotorSpeed(0.0f);
+    else
+        SetPlaneRotorSpeed(0.0f);
+}
+
 void CVehicleSA::SetPlaneRotorSpeed(float fSpeed)
 {
     auto pInterface = static_cast<CPlaneSAInterface*>(GetInterface());
@@ -1849,6 +1929,10 @@ void CVehicleSA::StaticSetHooks()
 {
     // Setup vehicle sun glare hook
     HookInstall(FUNC_CAutomobile_OnVehiclePreRender, (DWORD)HOOK_Vehicle_PreRender, 5);
+
+    // Setup hooks to handle setVehicleRotorState function
+    HookInstall(FUNC_CHeli_ProcessFlyingCarStuff, (DWORD)HOOK_CHeli_ProcessFlyingCarStuff, 5);
+    HookInstall(FUNC_CPlane_ProcessFlyingCarStuff, (DWORD)HOOK_CPlane_ProcessFlyingCarStuff, 5);
 }
 
 void CVehicleSA::SetVehiclesSunGlareEnabled(bool bEnabled)

Client/game_sa/CVehicleSA.h

@@ -94,6 +94,9 @@ struct RwTexture;
 #define FUNC_CAutomobile_OnVehiclePreRender 0x6ABCFD
 #define FUNC_CVehicle_DoSunGlare            0x6DD6F0
 
+#define FUNC_CHeli_ProcessFlyingCarStuff 0x6C4E7D
+#define FUNC_CPlane_ProcessFlyingCarStuff 0x6CB7D2
+
 // CClumpModelInfo::GetFrameFromName
 #define FUNC_CClumpModelInfo_GetFrameFromName 0x4C5400
 
@@ -422,6 +425,7 @@ class CVehicleSA : public virtual CVehicle, public virtual CPhysicalSA
     unsigned char                    m_ucVariant2;
     unsigned char                    m_ucVariantCount{0};
     bool                             m_doorsUndamageable{false};
+    bool                             m_rotorState{true};
 
     std::array<CVector, VEHICLE_DUMMY_COUNT> m_dummyPositions;
 
@@ -552,7 +556,8 @@ class CVehicleSA : public virtual CVehicle, public virtual CPhysicalSA
     bool           GetTakeLessDamage() { return GetVehicleInterface()->m_nVehicleFlags.bTakeLessDamage; };
     bool           GetTyresDontBurst() { return GetVehicleInterface()->m_nVehicleFlags.bTyresDontBurst; };
     unsigned short GetAdjustablePropertyValue() { return *reinterpret_cast<unsigned short*>(reinterpret_cast<unsigned long>(m_pInterface) + 2156); };
-    float          GetHeliRotorSpeed() { return *reinterpret_cast<float*>(reinterpret_cast<unsigned int>(m_pInterface) + 2124); };
+    float          GetHeliRotorSpeed() const;
+    bool           GetVehicleRotorState() const noexcept override { return m_rotorState; }
     float          GetPlaneRotorSpeed();
 
     unsigned long  GetExplodeTime() { return *reinterpret_cast<unsigned long*>(reinterpret_cast<unsigned int>(m_pInterface) + 1240); };
@@ -578,7 +583,8 @@ class CVehicleSA : public virtual CVehicle, public virtual CPhysicalSA
     {
         *reinterpret_cast<unsigned short*>(reinterpret_cast<unsigned int>(m_pInterface) + 2156) = usAdjustableProperty;
     };
-    void SetHeliRotorSpeed(float fSpeed) { *reinterpret_cast<float*>(reinterpret_cast<unsigned int>(m_pInterface) + 2124) = fSpeed; };
+    void SetHeliRotorSpeed(float speed);
+    void SetVehicleRotorState(bool state, bool stopRotor, bool isHeli) noexcept override;
     void SetPlaneRotorSpeed(float fSpeed);
     bool SetVehicleWheelRotation(float fWheelRot1, float fWheelRot2, float fWheelRot3, float fWheelRot4) noexcept;
     void SetExplodeTime(unsigned long ulTime) { *reinterpret_cast<unsigned long*>(reinterpret_cast<unsigned int>(m_pInterface) + 1240) = ulTime; };

Client/mods/deathmatch/logic/CClientVehicle.cpp

@@ -1572,6 +1572,19 @@ void CClientVehicle::SetHeliRotorSpeed(float fSpeed)
     m_fHeliRotorSpeed = fSpeed;
 }
 
+bool CClientVehicle::GetVehicleRotorState() const noexcept
+{
+    return m_pVehicle && (m_eVehicleType == CLIENTVEHICLE_HELI || m_eVehicleType == CLIENTVEHICLE_PLANE) ? m_pVehicle->GetVehicleRotorState() : m_rotorState;
+}
+
+void CClientVehicle::SetVehicleRotorState(bool state, bool stopRotor) noexcept
+{
+    if (m_pVehicle && (m_eVehicleType == CLIENTVEHICLE_HELI || m_eVehicleType == CLIENTVEHICLE_PLANE))
+        m_pVehicle->SetVehicleRotorState(state, stopRotor, GetVehicleType() == CLIENTVEHICLE_HELI);
+
+    m_rotorState = state;
+}
+
 void CClientVehicle::SetPlaneRotorSpeed(float fSpeed)
 {
     if (m_pVehicle && m_eVehicleType == CLIENTVEHICLE_PLANE)

Client/mods/deathmatch/logic/CClientVehicle.h

@@ -299,10 +299,12 @@ class CClientVehicle : public CClientStreamElement
     // TODO: Make the class remember on virtualization
     float GetHeliRotorSpeed();
     float GetPlaneRotorSpeed();
+    bool  GetVehicleRotorState() const noexcept;
 
     bool GetRotorSpeed(float&);
     bool SetRotorSpeed(float);
     bool SetWheelsRotation(float fRot1, float fRot2, float fRot3, float fRot4) noexcept;
+    void SetVehicleRotorState(bool state, bool stopRotor) noexcept;
     void SetHeliRotorSpeed(float fSpeed);
     void SetPlaneRotorSpeed(float fSpeed);
     bool IsHeliSearchLightVisible();
@@ -673,6 +675,7 @@ class CClientVehicle : public CClientStreamElement
     uchar m_ucTrackID;
     bool  m_bJustStreamedIn;
     bool  m_bWheelScaleChanged;
+    bool  m_rotorState{true};
 
     // Time dependent error compensation interpolation
     struct

Client/mods/deathmatch/logic/luadefs/CLuaVehicleDefs.cpp

@@ -94,6 +94,7 @@ void CLuaVehicleDefs::LoadFunctions()
         {"getVehicleWheelFrictionState", ArgumentParser<GetVehicleWheelFrictionState>},
         {"getVehicleEntryPoints", ArgumentParser<GetVehicleEntryPoints>},
         {"isVehicleSmokeTrailEnabled", ArgumentParser<IsSmokeTrailEnabled>},
+        {"getVehicleRotorState", ArgumentParser<GetVehicleRotorState>},
 
         // Vehicle set funcs
         {"createVehicle", CreateVehicle},
@@ -161,6 +162,7 @@ void CLuaVehicleDefs::LoadFunctions()
         {"setVehicleModelWheelSize", ArgumentParser<SetVehicleModelWheelSize>},
         {"spawnVehicleFlyingComponent", ArgumentParser<SpawnVehicleFlyingComponent>},
         {"setVehicleSmokeTrailEnabled", ArgumentParser<SetSmokeTrailEnabled>},
+        {"setVehicleRotorState", ArgumentParser<SetVehicleRotorState>},
     };
 
     // Add functions
@@ -250,6 +252,7 @@ void CLuaVehicleDefs::AddClass(lua_State* luaVM)
     lua_classfunction(luaVM, "getWheelFrictionState", "getVehicleWheelFrictionState");
     lua_classfunction(luaVM, "getEntryPoints", ArgumentParser<OOP_GetVehicleEntryPoints>);
     lua_classfunction(luaVM, "isSmokeTrailEnabled", "isVehicleSmokeTrailEnabled");
+    lua_classfunction(luaVM, "getRotorState", "getVehicleRotorState");
 
     lua_classfunction(luaVM, "setComponentVisible", "setVehicleComponentVisible");
     lua_classfunction(luaVM, "setSirensOn", "setVehicleSirensOn");
@@ -299,6 +302,7 @@ void CLuaVehicleDefs::AddClass(lua_State* luaVM)
     lua_classfunction(luaVM, "setWheelScale", "setVehicleWheelScale");
     lua_classfunction(luaVM, "setModelWheelSize", "setVehicleModelWheelSize");
     lua_classfunction(luaVM, "setSmokeTrailEnabled", "setVehicleSmokeTrailEnabled");
+    lua_classfunction(luaVM, "setRotorState", "setVehicleRotorState");
 
     lua_classfunction(luaVM, "resetComponentPosition", "resetVehicleComponentPosition");
     lua_classfunction(luaVM, "resetComponentRotation", "resetVehicleComponentRotation");
@@ -357,6 +361,7 @@ void CLuaVehicleDefs::AddClass(lua_State* luaVM)
     lua_classvariable(luaVM, "gravity", SetVehicleGravity, OOP_GetVehicleGravity);
     lua_classvariable(luaVM, "turnVelocity", SetVehicleTurnVelocity, OOP_GetVehicleTurnVelocity);
     lua_classvariable(luaVM, "wheelScale", "setVehicleWheelScale", "getVehicleWheelScale");
+    lua_classvariable(luaVM, "rotorState", "setVehicleRotorState", "getVehicleRotorState");
 
     lua_registerclass(luaVM, "Vehicle", "Element");
 }
@@ -4398,3 +4403,17 @@ bool CLuaVehicleDefs::IsSmokeTrailEnabled(CClientVehicle* vehicle) noexcept
 {
     return vehicle->IsSmokeTrailEnabled();
 }
+
+bool CLuaVehicleDefs::SetVehicleRotorState(CClientVehicle* vehicle, bool state, std::optional<bool> stopRotor) noexcept
+{
+    if (vehicle->GetVehicleType() != eClientVehicleType::CLIENTVEHICLE_HELI && vehicle->GetVehicleType() != eClientVehicleType::CLIENTVEHICLE_PLANE)
+        return false;
+
+    vehicle->SetVehicleRotorState(state, stopRotor.value_or(true));
+    return true;
+}
+
+bool CLuaVehicleDefs::GetVehicleRotorState(CClientVehicle* vehicle) noexcept
+{
+    return vehicle->GetVehicleRotorState();
+}

Client/mods/deathmatch/logic/luadefs/CLuaVehicleDefs.h

@@ -166,6 +166,9 @@ class CLuaVehicleDefs : public CLuaDefs
     static bool SetVehicleModelWheelSize(const unsigned short usModel, const eResizableVehicleWheelGroup eWheelGroup, const float fWheelSize);
     static int  GetVehicleWheelFrictionState(CClientVehicle* pVehicle, unsigned char wheel);
 
+    static bool SetVehicleRotorState(CClientVehicle* const vehicle, bool state, std::optional<bool> stopRotor) noexcept;
+    static bool GetVehicleRotorState(CClientVehicle* const vehicle) noexcept;
+
     static bool AddVehicleSirens(CClientVehicle* vehicle, std::uint8_t sirenType, std::uint8_t sirenCount, std::optional<bool> enable360, std::optional<bool> enableLOSCheck, std::optional<bool> enableRandomiser, std::optional<bool> enableSilent) noexcept;
     static bool RemoveVehicleSirens(CClientVehicle* vehicle) noexcept;
 

Client/sdk/game/CVehicle.h

@@ -198,7 +198,8 @@ class CVehicle : public virtual CPhysical
     virtual bool           GetTakeLessDamage() = 0;
     virtual bool           GetTyresDontBurst() = 0;
     virtual unsigned short GetAdjustablePropertyValue() = 0;
-    virtual float          GetHeliRotorSpeed() = 0;
+    virtual float          GetHeliRotorSpeed() const = 0;
+    virtual bool           GetVehicleRotorState() const noexcept = 0;
     virtual float          GetPlaneRotorSpeed() = 0;
     virtual unsigned long  GetExplodeTime() = 0;
 
@@ -220,6 +221,7 @@ class CVehicle : public virtual CPhysical
     virtual void SetTyresDontBurst(bool bTyresDontBurst) = 0;
     virtual void SetAdjustablePropertyValue(unsigned short usAdjustableProperty) = 0;
     virtual void SetHeliRotorSpeed(float fSpeed) = 0;
+    virtual void SetVehicleRotorState(bool state, bool stopRotor, bool isHeli) noexcept = 0;
     virtual void SetPlaneRotorSpeed(float fSpeed) = 0;
     virtual bool SetVehicleWheelRotation(float fRot1, float fRot2, float fRot3, float fRot4) noexcept = 0;
     virtual void SetTaxiLightOn(bool bLightState) = 0;