Fix isPedOnGround (#4317)

Author: FileEX

Client/mods/deathmatch/logic/CClientPed.cpp

@@ -4673,12 +4673,20 @@ float CClientPed::GetDistanceFromGround()
     return (vecPosition.fZ - fGroundLevel);
 }
 
-bool CClientPed::IsOnGround()
+bool CClientPed::IsOnGround(bool checkVehicles)
 {
     CVector vecPosition;
     GetPosition(vecPosition);
     float fGroundLevel = static_cast<float>(g_pGame->GetWorld()->FindGroundZFor3DPosition(&vecPosition));
-    return (vecPosition.fZ > fGroundLevel && (vecPosition.fZ - fGroundLevel) <= 1.0f);
+
+    if (DefinitelyLessThan(vecPosition.fZ, fGroundLevel))
+        return false;
+
+    bool isOnGround = DefinitelyLessThan((vecPosition.fZ - fGroundLevel), 1.0f) || EssentiallyEqual((vecPosition.fZ - fGroundLevel), 1.0f);
+    if (!isOnGround && checkVehicles && m_pPlayerPed)
+        return m_pPlayerPed->IsStandingOnEntity();
+
+    return isOnGround;
 }
 
 bool CClientPed::IsClimbing()

Client/mods/deathmatch/logic/CClientPed.h

@@ -380,7 +380,7 @@ class CClientPed : public CClientStreamElement, public CAntiCheatModule
 
     void SetInWater(bool bIsInWater) { m_bIsInWater = bIsInWater; };
     bool IsInWater();
-    bool IsOnGround();
+    bool IsOnGround(bool checkVehicles = false);
 
     bool          IsClimbing();
     bool          IsRadioOn() const noexcept { return m_bRadioOn; };

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

@@ -914,13 +914,15 @@ int CLuaPedDefs::IsPedOnGround(lua_State* luaVM)
 {
     // Verify the argument
     CClientPed*      pPed = NULL;
+    bool             checkVehicles = false;
     CScriptArgReader argStream(luaVM);
     argStream.ReadUserData(pPed);
+    argStream.ReadBool(checkVehicles, false);
 
     if (!argStream.HasErrors())
     {
         // Find out whether he's on the ground or not and return it
-        bool bOnGround = pPed->IsOnGround();
+        bool bOnGround = pPed->IsOnGround(checkVehicles);
         lua_pushboolean(luaVM, bOnGround);
         return 1;
     }

Shared/sdk/SharedUtil.Math.h

@@ -118,4 +118,25 @@ namespace SharedUtil
     {
 	    return std::fabs(a - b) <= epsilon;
     }
+
+    inline bool ApproximatelyEqual(float a, float b, float epsilon = std::numeric_limits<float>().epsilon()) noexcept
+    {
+        return std::fabs(a - b) <= std::max(std::fabs(a), std::fabs(b)) * epsilon;
+    }
+
+    inline bool EssentiallyEqual(float a, float b, float epsilon = std::numeric_limits<float>().epsilon()) noexcept
+    {
+        return std::fabs(a - b) <= std::min(std::fabs(a), std::fabs(b)) * epsilon;
+    }
+
+    inline bool DefinitelyGreaterThan(float a, float b, float epsilon = std::numeric_limits<float>().epsilon()) noexcept
+    {
+        return (a - b) > std::max(std::fabs(a), std::fabs(b)) * epsilon;
+    }
+
+    inline bool DefinitelyLessThan(float a, float b, float epsilon = std::numeric_limits<float>().epsilon()) noexcept
+    {
+        return (b - a) > std::max(std::fabs(a), std::fabs(b)) * epsilon;
+    }
+
 }            // namespace SharedUtil