Fix healthbar blinking faster on high fps (#2487)

Author: Merlin

Client/multiplayer_sa/CMultiplayerSA.cpp

@@ -288,6 +288,8 @@ DWORD       RETURN_CTaskSimpleSwim_ProcessSwimmingResistance = 0x68A50E;
 const DWORD HOOKPOS_Idle_CWorld_ProcessPedsAfterPreRender = 0x53EA03;
 const DWORD RETURN_Idle_CWorld_ProcessPedsAfterPreRender = 0x53EA08;
 
+#define HOOKPOS_CHud_RenderHealthBar 0x5892AF
+
 #define HOOKPOS_CAEAmbienceTrackManager__UpdateAmbienceTrackAndVolume_StartRadio    0x4D7198
 #define HOOKPOS_CAEAmbienceTrackManager__UpdateAmbienceTrackAndVolume_StopRadio     0x4D71E7
 
@@ -530,6 +532,8 @@ void HOOK_CAEVehicleAudioEntity__ProcessDummyProp();
 void HOOK_CTaskSimpleSwim_ProcessSwimmingResistance();
 void HOOK_Idle_CWorld_ProcessPedsAfterPreRender();
 
+void HOOK_CHud_RenderHealthBar();
+
 void HOOK_CAEAmbienceTrackManager__UpdateAmbienceTrackAndVolume_StartRadio();
 void HOOK_CAEAmbienceTrackManager__UpdateAmbienceTrackAndVolume_StopRadio();
 
@@ -762,6 +766,8 @@ void CMultiplayerSA::InitHooks()
     HookInstall(HOOKPOS_CAnimManager_AddAnimationAndSync, (DWORD)HOOK_CAnimManager_AddAnimationAndSync, 10);
     HookInstall(HOOKPOS_CAnimManager_BlendAnimation_Hierarchy, (DWORD)HOOK_CAnimManager_BlendAnimation_Hierarchy, 5);
 
+    HookInstall(HOOKPOS_CHud_RenderHealthBar, (DWORD)HOOK_CHud_RenderHealthBar, 9);
+
     HookInstall(HOOKPOS_CAEAmbienceTrackManager__UpdateAmbienceTrackAndVolume_StartRadio,
                 (DWORD)HOOK_CAEAmbienceTrackManager__UpdateAmbienceTrackAndVolume_StartRadio, 5);
     HookInstall(HOOKPOS_CAEAmbienceTrackManager__UpdateAmbienceTrackAndVolume_StopRadio,
@@ -6945,6 +6951,29 @@ void _declspec(naked) HOOK_Idle_CWorld_ProcessPedsAfterPreRender()
     }
 }
 
+const DWORD RETURN_CHud_RenderHealthBar = 0x5892B8;
+const DWORD RETURN_CHud_RenderHealthBarNoRender = 0x58939E;
+void _declspec(naked) HOOK_CHud_RenderHealthBar()
+{
+    __asm {
+        //(CTimer::m_snTimeInMilliseconds / 250) % 2
+        mov eax, 0xB7CB84
+        mov eax, [eax]
+        xor edx, edx
+        mov ecx, 250
+        div ecx
+        xor edx, edx
+        mov ecx, 2
+        div ecx
+        test edx, edx
+        jz norender
+        jmp RETURN_CHud_RenderHealthBar
+
+norender:
+        jmp RETURN_CHud_RenderHealthBarNoRender
+    }
+}
+
 DWORD dwLastRequestedStation = -1;
 void  CAEAmbienceTrackManager__UpdateAmbienceTrackAndVolume_ChangeStation(DWORD dwStationID)
 {