C++ implementation for Moho__Entity__GetFootprint

hooks/EntityGetFootprint.hook

@@ -4,7 +4,5 @@
 
 
 //  Moho::Entity::GetFootprint
-0x006788A5:
-    jmp @asm__GetFootprint
-    nop
-    nop
+0x00678880:
+    jmp @Moho__Entity__GetFootprint

section/EntityGetFootprint.cxx

@@ -0,0 +1,48 @@
+#include "CObject.h"
+#include "magic_classes.h"
+#include "moho.h"
+
+int ForceAltFootprint(lua_State *L)
+{
+
+    if (lua_gettop(L) != 2)
+        L->LuaState->Error(s_ExpectedButGot, __FUNCTION__, 2, lua_gettop(L));
+    auto res = GetCScriptObject<Unit>(L, 1);
+    if (res.IsFail())
+        L->LuaState->Error("%s", res.reason);
+
+    void *unit = res.object;
+    bool flag = lua_toboolean(L, 2);
+
+    GetField<bool>(unit, 8 + 0x11D) = flag; // bool forceAltFootprint
+
+    return 0;
+}
+using UnitMethodReg = SimRegFuncT<0x00E2D550, 0x00F8D704>;
+
+UnitMethodReg UseAltFootprintReg{
+    "ForceAltFootprint",
+    "",
+    ForceAltFootprint,
+    "Unit"};
+
+SHARED void *__thiscall Moho__Entity__GetFootprint(Entity *entity)
+{
+    void *bp = GetField<void *>(entity, 0x6C);
+    if (!bp)
+    {
+        runtime_error err(string{"Attempt to get footprint on nameless entity"});
+        _CXXThrowException(&err, (void *)0xEC210C);
+    }
+    void *sstiData = Offset<void *>(entity, 0x78);
+    bool usingAltFp = GetField<bool>(sstiData, 0xA4);
+    bool forceAltFp = GetField<bool>(sstiData, 0xA5);
+    if (usingAltFp || forceAltFp)
+    {
+        return Offset<void *>(bp, 0xE8);
+    }
+    else
+    {
+        return Offset<void *>(bp, 0xD8);
+    }
+}