ChaosMod: Add Model Spawn Bypass (#3620)

Allows all models to be spawned (e.g. LOD models).

ChaosMod/ChaosMod.vcxproj

@@ -384,6 +384,7 @@
     <ClCompile Include="Main.cpp" />
     <ClCompile Include="Memory\Hooks\AudioClearnessHook.cpp" />
     <ClCompile Include="Memory\Hooks\ApplyChangeSetEntryHook.cpp" />
+    <ClCompile Include="Memory\Hooks\ModelSpawnBypass.cpp" />
     <ClCompile Include="Memory\Hooks\PresentHook.cpp" />
     <ClCompile Include="Memory\Hooks\ScriptThreadRunHook.cpp" />
     <ClCompile Include="Memory\Hooks\HandleToEntityStructHook.cpp" />

ChaosMod/Memory/Hooks/ModelSpawnBypass.cpp

@@ -0,0 +1,40 @@
+#include <stdafx.h>
+
+#include "Memory/Hooks/Hook.h"
+
+static DWORD64 ms_ModelSpawnPatchAddr = 0;
+static std::array<BYTE, 24> ms_ModelSpawnPatchOrigBytes;
+
+static bool OnHook()
+{
+	Handle handle = Memory::FindPattern("48 85 C0 0F 84 ? ? ? ? 8B 48 50");
+	if (!handle.IsValid())
+	{
+		LOG("ModelSpawnBypass: Failed to patch model spawn bypass!");
+
+		return false;
+	}
+	else
+	{
+		ms_ModelSpawnPatchAddr = handle.Addr();
+		memcpy_s(ms_ModelSpawnPatchOrigBytes.data(), ms_ModelSpawnPatchOrigBytes.size(),
+		         reinterpret_cast<void *>(ms_ModelSpawnPatchAddr), 24);
+
+		Memory::Write<BYTE>(reinterpret_cast<BYTE *>(ms_ModelSpawnPatchAddr), 0x90, 24);
+
+		LOG("ModelSpawnBypass: Applied model spawn bypass patch!");
+
+		return true;
+	}
+}
+
+static void OnCleanup()
+{
+	if (ms_ModelSpawnPatchAddr)
+	{
+		memcpy_s(reinterpret_cast<void *>(ms_ModelSpawnPatchAddr), 24, ms_ModelSpawnPatchOrigBytes.data(),
+		         ms_ModelSpawnPatchOrigBytes.size());
+	}
+}
+
+static RegisterHook registerHookBypass(OnHook, OnCleanup, "_ModelSpawnBypass");