Add GameObjectTypeWrapper Get_Display_Name() function

functions/functions.h

@@ -11,3 +11,7 @@ void Register_All(lua_State* L);
 void Register_FileIO(lua_State* L);
 void Register_Players(lua_State* L);
 void Register_ScreenText(lua_State* L);
+
+// Called from the GameObjectTypeWrapper ctor hook (not from Register_All).
+// Registers custom member functions on each wrapper instance.
+void Register_GOTMembers(void* wrapper);

functions/game_object_type.cpp

@@ -0,0 +1,92 @@
+#include "functions.h"
+#include "../lua_hook.h"
+#include <windows.h>
+#include <string>
+#include <cstring>
+
+// Offset of SmartPtr<GameObjectTypeClass> within GameObjectTypeWrapper.
+// SmartPtr stores the raw pointer as its first member.
+static constexpr int OFFSET_OBJECT = 0x70;
+
+// MSVC std::wstring layout (x64, MSVC 14.0+).
+// Used to read the wstring* returned by GameTextClass::Get.
+struct MSVCWString {
+    union {
+        wchar_t buf[8];    // SSO buffer (up to 7 wchars + null)
+        wchar_t* ptr;      // heap pointer when capacity > 7
+    };
+    size_t size;
+    size_t capacity;       // <= 7 means SSO, > 7 means heap
+
+    const wchar_t* c_str() const { return (capacity <= 7) ? buf : ptr; }
+};
+
+// Custom member function registered on GameObjectTypeWrapper.
+// Signature matches LuaTable* __thiscall (LuaScriptClass*, LuaTable*).
+// On x64 this is the standard calling convention: this_wrapper in RCX, script in RDX, params in R8.
+static void* Lua_Get_Display_Name(void* this_wrapper, void* /*script*/, void* /*params*/)
+{
+    // 1. Get GameObjectTypeClass* from SmartPtr at offset 0x70
+    void* got_class = *(void**)((char*)this_wrapper + OFFSET_OBJECT);
+    if (!got_class)
+        return nullptr;
+
+    // 2. Get the text ID string (e.g. "TEXT_UNIT_X_WING") via Get_Text_Name_ID.
+    //    The game's function constructs a std::string into our buffer via copy-ctor.
+    //    Assumes shared CRT (both DLL and game link to vcruntime140.dll dynamically).
+    std::string text_id;
+    pfn_get_text_name_id(got_class, &text_id);
+
+    // 3. Resolve the localized display name via TheGameText.Get(text_id, false).
+    //    Returns a pointer to an internal wstring (the translated text).
+    MSVCWString* display_wstr = (MSVCWString*)pfn_game_text_get(g_the_game_text, &text_id, false);
+    if (!display_wstr)
+        return nullptr;
+
+    // 4. Convert the wide display name to a narrow (UTF-8) string for Lua.
+    const wchar_t* wdata = display_wstr->c_str();
+    int wlen = (int)display_wstr->size;
+
+    int narrow_len = WideCharToMultiByte(CP_UTF8, 0, wdata, wlen, nullptr, 0, nullptr, nullptr);
+    if (narrow_len <= 0)
+        return nullptr;
+
+    std::string narrow(narrow_len, '\0');
+    WideCharToMultiByte(CP_UTF8, 0, wdata, wlen, &narrow[0], narrow_len, nullptr, nullptr);
+
+    // 5. Create a LuaString (LuaValue<string>, 0x78 bytes) and return it.
+    void* lua_value = ::operator new(0x78);
+    if (!lua_value)
+        return nullptr;
+    memset(lua_value, 0, 0x78);
+    pfn_lua_value_ctor(lua_value, &narrow);
+
+    return pfn_return_variable(this_wrapper, lua_value);
+}
+
+void Register_GOTMembers(void* wrapper)
+{
+    if (!pfn_lmfw_ctor || !pfn_register_member)
+        return;
+    if (!pfn_get_text_name_id || !pfn_game_text_get || !g_the_game_text)
+        return;
+    if (!pfn_lua_value_ctor || !pfn_return_variable)
+        return;
+
+    // Allocate a LuaMemberFunctionWrapper<GameObjectTypeWrapper> (0x88 bytes).
+    void* lmfw = ::operator new(0x88);
+    if (!lmfw) return;
+    memset(lmfw, 0, 0x88);
+
+    // Build the 16-byte pointer-to-member-function structure.
+    // MSVC x64 multiple-inheritance PMF: [8-byte func addr][8-byte this-adjustment].
+    // this-adjustment is 0 (our function expects the full GameObjectTypeWrapper*).
+    alignas(8) uint8_t pmf[16] = {};
+    *(uintptr_t*)pmf = (uintptr_t)&Lua_Get_Display_Name;
+
+    // Construct the LuaMemberFunctionWrapper via the game's ctor.
+    pfn_lmfw_ctor(lmfw, wrapper, pmf, false);
+
+    // Register as a member callable via wrapper.Get_Display_Name()
+    pfn_register_member(wrapper, "Get_Display_Name", lmfw);
+}