drew/FoCAPI
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases 5 Wiki Activity

Enable Get_Display_Name in StarWarsG #3

Merged
drew merged 3 commits from display-text into main 2026-03-14 22:41:24 -05:00
Conversation 0 Commits 3 Files Changed 5 +49 -19
4 changed files with 49 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files
Showing only changes of commit 7deb2ff293 - Show all commits

8
functions/game_object_type.cpp
View File

@@ -54,12 +54,10 @@ static void* Lua_Get_Display_Name(void* this_wrapper, void* /*script*/, void* /*
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);
// 5. Create a LuaString (LuaValue<string>) and return it.
void* lua_value = CreateLuaValueString(narrow);
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);
}
@@ -70,7 +68,7 @@ void Register_GOTMembers(void* wrapper)
return;
if (!pfn_get_text_name_id || !pfn_game_text_get || !g_the_game_text)
return;
if (!pfn_lua_value_ctor || !pfn_return_variable)
if (!pfn_return_variable)
return;
// Allocate a LuaMemberFunctionWrapper<GameObjectTypeWrapper> (0x88 bytes).

31
lua_hook.cpp
View File

@@ -2,6 +2,12 @@
#include "functions/functions.h"
#include <MinHook.h>
#include <windows.h>
#include <cstring>
#include <new>
// Cached during init for CreateLuaValueString
static const LuaRVAs* g_rvas = nullptr;
static uintptr_t g_base = 0;
// Resolved function pointers
fn_lua_open real_lua_open = nullptr;
@@ -22,7 +28,6 @@ fn_RemoveTutorialText pfn_remove_tutorial_text = nullptr;
void* g_command_bar = nullptr;
fn_DebugPrint pfn_debug_print = nullptr;
fn_RegisterMember pfn_register_member = nullptr;
fn_LuaValueCtor pfn_lua_value_ctor = nullptr;
fn_ReturnVariable pfn_return_variable = nullptr;
fn_GotWrapperCtor real_got_wrapper_ctor = nullptr;
fn_LmfwCtor pfn_lmfw_ctor = nullptr;
@@ -36,6 +41,24 @@ void register_global(lua_State* L, const char* name, lua_CFunction fn) {
pfn_settable(L, LUA_GLOBALSINDEX);
}
void* CreateLuaValueString(const std::string& str) {
if (!g_rvas || !g_rvas->lua_value_string_vftable)
return nullptr;
void* obj = ::operator new(g_rvas->lua_value_string_size);
if (!obj)
return nullptr;
memset(obj, 0, g_rvas->lua_value_string_size);
// Set the vftable pointer
*(uintptr_t*)obj = g_base + g_rvas->lua_value_string_vftable;
// Placement-new the string into the member offset
new ((char*)obj + g_rvas->lua_value_string_offset) std::string(str);
return obj;
}
// Fired every time the game constructs a GameObjectTypeWrapper
static void* Hook_GOTWrapperCtor(void* this_wrapper) {
void* result = real_got_wrapper_ctor(this_wrapper);
@@ -73,6 +96,8 @@ bool LuaHook_Init() {
return false;
uintptr_t base = (uintptr_t)GetModuleHandleA(nullptr);
g_rvas = rvas;
g_base = base;
pfn_pushstring = (fn_lua_pushstring)(base + rvas->lua_pushstring);
pfn_pushcclosure = (fn_lua_pushcclosure)(base + rvas->lua_pushcclosure);
@@ -101,8 +126,6 @@ bool LuaHook_Init() {
if (rvas->register_member)
pfn_register_member = (fn_RegisterMember)(base + rvas->register_member);
if (rvas->lua_value_ctor)
pfn_lua_value_ctor = (fn_LuaValueCtor)(base + rvas->lua_value_ctor);
if (rvas->return_variable)
pfn_return_variable = (fn_ReturnVariable)(base + rvas->return_variable);
@@ -138,7 +161,7 @@ bool LuaHook_Init() {
if (rvas->got_wrapper_ctor && rvas->got_lmfw_ctor &&
pfn_register_member && pfn_lmfw_ctor &&
pfn_get_text_name_id && pfn_game_text_get && g_the_game_text &&
pfn_lua_value_ctor && pfn_return_variable)
rvas->lua_value_string_vftable && pfn_return_variable)
{
void* got_ctor_target = (void*)(base + rvas->got_wrapper_ctor);
if (MH_CreateHook(got_ctor_target, &Hook_GOTWrapperCtor, (void**)&real_got_wrapper_ctor) == MH_OK) {

7
lua_hook.h
View File

@@ -1,5 +1,6 @@
#pragma once
#include "rvas.h"
#include <string>
struct lua_State;
typedef int (*lua_CFunction)(lua_State*);
@@ -22,7 +23,6 @@ typedef void (*fn_RemoveTutorialText)(void*, const char*);
typedef void (*fn_DebugPrint)(const char*); // Debug_Print
// Scripting internals (LuaUserVar) -- usable by any wrapper module
typedef void (*fn_RegisterMember)(void* uservar, const char* name, void* fn_ptr); // LuaUserVar::Register_Member
typedef void (*fn_LuaValueCtor)(void* lua_value, void* basic_string_ptr); // LuaValue<>::LuaValue<>(basic_string<>*)
typedef void* (*fn_ReturnVariable)(void* uservar, void* lua_var); // LuaUserVar::Return_Variable(LuaVar*) -> LuaTable*
// Game Object Type Wrapper internals
typedef void* (*fn_GotWrapperCtor)(void* this_wrapper); // GameObjectTypeWrapper::GameObjectTypeWrapper()
@@ -49,7 +49,6 @@ extern fn_RemoveTutorialText pfn_remove_tutorial_text;
extern void* g_command_bar;
extern fn_DebugPrint pfn_debug_print;
extern fn_RegisterMember pfn_register_member;
extern fn_LuaValueCtor pfn_lua_value_ctor;
extern fn_ReturnVariable pfn_return_variable;
extern fn_GotWrapperCtor real_got_wrapper_ctor;
extern fn_LmfwCtor pfn_lmfw_ctor;
@@ -62,5 +61,9 @@ constexpr int LUA_GLOBALSINDEX = -10001;
// Equivalent of lua_setglobal — registers a C function in the Lua global table
void register_global(lua_State* L, const char* name, lua_CFunction fn);
// Creates a LuaValue<basic_string<>> from a std::string.
// Reproduces the inlined constructor pattern using per-executable layout constants.
void* CreateLuaValueString(const std::string& str);
bool LuaHook_Init();
void LuaHook_Shutdown();

22
rvas.h
View File

@@ -16,7 +16,9 @@ struct LuaRVAs {
uintptr_t get_script_from_state; // LuaScriptClass::Get_Script_From_State (static)
uintptr_t map_var_to_lua; // LuaScriptClass::Map_Var_To_Lua (member)
uintptr_t register_member; // LuaUserVar::Register_Member(char*, LuaVar*)
uintptr_t lua_value_ctor; // LuaValue<>::LuaValue<>(basic_string<>*)
uintptr_t lua_value_string_vftable; // LuaValue<basic_string<>>::vftable
size_t lua_value_string_size; // allocation size of LuaValue<basic_string<>>
size_t lua_value_string_offset; // offset of basic_string member within LuaValue
uintptr_t return_variable; // LuaUserVar::Return_Variable(LuaVar*)
// --- TheGameText ---
@@ -58,7 +60,9 @@ constexpr LuaRVAs RVAs_StarWarsI = {
0x0537BB0, // LuaScriptClass::Get_Script_From_State
0x0536FE0, // LuaScriptClass::Map_Var_To_Lua
0x0046f51, // LuaUserVar::Register_Member
0x004df5e, // LuaValue<>::LuaValue<>
0x1453310, // LuaValue<basic_string<>>::vftable
0x78, // LuaValue<basic_string<>> allocation size
0x58, // basic_string member offset within LuaValue
0x0058887, // LuaUserVar::Return_Variable
// --- TheGameText ---
@@ -99,13 +103,15 @@ constexpr LuaRVAs RVAs_StarWarsG = {
// --- Scripts ---
0x0245790, // LuaScriptClass::Get_Script_From_State
0x0247700, // LuaScriptClass::Map_Var_To_Lua
0, // LuaUserVar::Register_Member -- not mapped
0, // LuaString::LuaString -- not mapped
0, // LuaUserVar::Return_Variable -- not mapped
0x024be40, // LuaUserVar::Register_Member
0x0855a98, // LuaValue<basic_string<>>::vftable
0x30, // LuaValue<basic_string<>> allocation size
0x10, // basic_string member offset within LuaValue
0x0256d40, // LuaUserVar::Return_Variable
// --- TheGameText ---
0, // TheGameText global object
0, // GameTextClass::Get
0x0a7bc58, // TheGameText global object
0x01fa680, // GameTextClass::Get
// --- Players ---
0x0294bc0, // PlayerListClass::Get_Player_By_Index
@@ -118,7 +124,7 @@ constexpr LuaRVAs RVAs_StarWarsG = {
0x02ff290, // CommandBarClass::Remove_Tutorial_Text
// --- Game Object Type Wrapper ---
0, // GameObjectTypeWrapper::GameObjectTypeWrapper() -- not mapped
0x0604a10, // GameObjectTypeWrapper::GameObjectTypeWrapper()
0, // GameObjectTypeClass::Get_Text_Name_ID() -- not mapped
0, // LuaMemberFunctionWrapper<GameObjectTypeWrapper>::ctor -- not mapped