ReshadePluginsCore/FearTheTimeloop/dllmain.cpp

#include "CommonHeaders.h"
#include "UEngine.hpp"
#include "UETools.hpp"
#include "UEvars.hpp"
#include "Logger.hpp"
#include "SDK/Basic.hpp"
#include "SDK/Engine_classes.hpp"
#include "SDK/W_FullUI_classes.hpp"
#include "SDK/CBP_James_Cooper_classes.hpp"
#include "SDK/BPC_HealthSystem_classes.hpp"

using namespace SDK;

// Constants
const std::string PLUGIN_NAME = "FearTheTimeloop";
const std::string PLUGIN_LOG = PLUGIN_NAME + ".log";

// Logger
std::shared_ptr<spdlog::logger> logger;

// Screen informations
static int screenWidth = GetSystemMetrics(SM_CXSCREEN);
static int screenHeight = GetSystemMetrics(SM_CYSCREEN);
static float aspectRatio = (float)screenWidth / screenHeight;
float baseAspect = 1.777778f;

// Plugin states
static bool AOBScanDone = false;
static bool g_Console = false;
static bool g_fix_enabled = false;
static bool g_fov_fix_enabled = false;
static bool g_camera_fix_enabled = false;
static bool g_ultrawide_fix_enabled = false;
static bool g_HUD_fix_enabled = false;
static bool g_Camera_fix_enabled = false;
static bool g_Vignetting_fix_enabled = false;
static bool g_Fog_fix_enabled = false;
static bool g_TimeDilation_fix_enabled = false;
static bool g_GodMode_fix_enabled = false;
static int g_AdditionalFOVValue = 0;
static float g_cameraDistanceMultiplier = 1.f;
static float g_WorldTimeDilationValue = 1.f;
static float g_AITimeDilationValue = 1.f;
static int g_HUDOffsets = 0.f;
static bool user_inputs_logged = false;

// Shared values
static float g_FOV_In = 90.f;
static float g_FOV_Out = 90.f;
static float g_Camera_In = 120;
static float g_Camera_Out = 120;

// AOB Scan pointers
static uint8_t* FOVaddress = nullptr;
static uint8_t* Cameraaddress = nullptr;
static uint8_t* Vignettingaddress = nullptr;
static uint8_t* Fogaddress = nullptr;
static uint8_t* WorldTimedilationaddress = nullptr;

// Hooking
static SafetyHookMid FOVHook{};
static SafetyHookMid CameraHook{};
static SafetyHookMid PEHook{};
static SafetyHookMid WorldTimeDilationHook{};

// Prototypes
static void FOVFixEnabled();
static void CameraFixEnabled();
static void HUDFixEnabled(const std::vector<UUserWidget*>& widgets);
static void LogHUD(GameFixes fix);
static void DOFFixEnabled();
static void CAFixEnabled();
static void VignettingFixEnabled();
static void FogFixEnabled();
static void EnableConsole();
static void EnableCheats(Cheat cheat);
static void ProcessEvent();

// Unreal Engine widgets
static UW_FullUI_C* g_FullUI = nullptr;
static UUserWidget* g_MainMenu = nullptr;

extern "C" __declspec(dllexport) void SetFixEnabled(bool enabled, bool init) {
    g_fix_enabled = enabled;
    if (!AOBScanDone) { // Unreal Engine 5.5.4
        logger->info("--------------- AOB scan started ---------------");
        constexpr auto FOVStringObfuscated = make_obfuscated<0xF3>("77 ?? 48 ?? ?? FF 90 ?? ?? ?? ?? F3 0F ?? ?? ?? 48 83 ?? ?? C3");
        constexpr auto CameraStringObfuscated = make_obfuscated<0xF3>("F3 0F 10 ?? ?? ?? ?? ?? F2 0F 10 ?? ?? ?? F2 0F 10 ?? ?? ?? 0F ?? ?? 0F");
        constexpr auto VignettingStringObfuscated = make_obfuscated<0x7D>("8B ?? 83 ?? ?? 7D ?? 44 89");
        constexpr auto FogStringObfuscated = make_obfuscated<0x75>("74 ?? 48 8B ?? ?? ?? ?? ?? 83 ?? ?? ?? 75 ?? 40 ?? ?? EB ?? 40 ?? ?? 48");
        constexpr auto WorldTimeDilationStringObfuscated = make_obfuscated<0x59>("F3 0F 10 ?? ?? ?? ?? ?? F3 0F 59 ?? ?? ?? ?? ?? F3 0F 59 ?? ?? ?? ?? ?? C3");

        using AOBScan::Make;
        using OffsetScan::Make;
        // Prepare all data for scanning
        std::vector<AOBScanEntry> signatures = {
            Make(&FOVaddress, FOVStringObfuscated, "FOV"),
            Make(&Cameraaddress, CameraStringObfuscated, "Camera distance"),
            Make(&Vignettingaddress, VignettingStringObfuscated, "Vignetting"),
            Make(&Fogaddress, FogStringObfuscated, "Fog"),
            Make(&WorldTimedilationaddress, WorldTimeDilationStringObfuscated, "World time dilation"),
        };
        // Scan all signature in a batch
        Memory::AOBScanBatch(signatures, logger);

        if (FOVaddress && Cameraaddress && Vignettingaddress && Fogaddress && WorldTimedilationaddress)
            logger->info("All AOB signatures found. Ready to patch...");

        if (!GObjectsaddress || !AppendStringaddress || !ProcessEventaddress) {
            logger->info("------------ UEngine offsets search ------------");
            uint8_t* baseModule = reinterpret_cast<uint8_t*>(GetModuleHandleA(nullptr)); // Get game base address

            constexpr auto GObjetcsStringObfuscated = make_obfuscated<0x8D>("48 8B ?? ?? ?? ?? ?? 48 8B ?? ?? 48 8D ?? ?? EB ?? 33");
            constexpr auto AppendStringStringObfuscated = make_obfuscated<0x80>("48 89 ?? ?? ?? 48 89 ?? ?? ?? 57 48 83 ?? ?? 80 3D ?? ?? ?? ?? ?? 48 ?? F2 8B ?? 48 ?? ?? 74 ?? 4C 8D ?? ?? ?? ?? ?? EB ?? 48 8D ?? ?? ?? ?? ?? E8 ?? ?? ?? ?? 4C");
            constexpr auto ProcessEventStringObfuscated = make_obfuscated<0x56>("40 ?? 56 57 41 ?? 41 ?? 41 ?? 41 ?? 48 81 ?? ?? ?? ?? ?? 48 8D ?? ?? ?? 48 89 ?? ?? ?? ?? ?? 48 8B ?? ?? ?? ?? ?? 48 ?? ?? 48 89 ?? ?? ?? ?? ?? 4D");

            // Prepare all data for scanning
            std::vector<OffsetScanEntry> UEoffsetsScans = {
                Make(&GObjectsaddress, GObjetcsStringObfuscated, "GObjects", OffsetCalcType::GetOffsetFromOpcode, &Offsets::GObjects, 0x3),
                Make(&AppendStringaddress, AppendStringStringObfuscated, "AppendString", OffsetCalcType::UE_CalculateOffset, &Offsets::AppendString),
                Make(&ProcessEventaddress, ProcessEventStringObfuscated, "ProcessEvent", OffsetCalcType::UE_CalculateOffset, &Offsets::ProcessEvent)
            };
            // Retrieve all Unreal Engine offsets in a batch
            Memory::OffsetScanBatch(UEoffsetsScans, baseModule, logger, "");
        }
        logger->info("-------------- Fixes initialisation -------------");
        AOBScanDone = true;
    }

    if (!init && FOVaddress) FOVFixEnabled();
    if (!init && Cameraaddress) CameraFixEnabled();
    if (!init) HUDFixEnabled({ g_FullUI, g_MainMenu });
    if (!init && Vignettingaddress) VignettingFixEnabled();
    if (!init && Fogaddress) FogFixEnabled();
    if (!init && WorldTimedilationaddress) {
        EnableCheats(Cheat::TimeDilation);
        EnableCheats(Cheat::GodMode);
    }
    ProcessEvent();
}

// Setters for Reshade addon call
extern "C" __declspec(dllexport) void SetFixesEnabled(GameFixes fix, bool enabled) { // Set each fix individually
    if (fix == GameFixes::DevConsole)           { g_Console = enabled; EnableConsole(); }
    if (fix == GameFixes::FOV)                  { g_fov_fix_enabled = enabled; FOVFixEnabled(); }
    if (fix == GameFixes::Camera)               { g_camera_fix_enabled = enabled; CameraFixEnabled(); }
    if (fix == GameFixes::HUD)                  { g_HUD_fix_enabled = enabled; HUDFixEnabled({ g_FullUI, g_MainMenu }); LogHUD(GameFixes::HUD); }
    if (fix == GameFixes::UltraWide)            { g_ultrawide_fix_enabled = enabled; HUDFixEnabled({ g_FullUI }); LogHUD(GameFixes::UltraWide); }
    if (fix == GameFixes::Vignetting)           { g_Vignetting_fix_enabled = enabled; VignettingFixEnabled(); }
    if (fix == GameFixes::Fog)                  { g_Fog_fix_enabled = enabled; FogFixEnabled(); }
    if (fix == GameFixes::TimeDilation)         { g_TimeDilation_fix_enabled = enabled; EnableCheats(Cheat::TimeDilation); }
    if (fix == GameFixes::GodMode)              { g_GodMode_fix_enabled = enabled; EnableCheats(Cheat::GodMode); }
}

extern "C" __declspec(dllexport) void SetValues(GameSetting setting, float value) {
    if (setting == GameSetting::FOV) g_AdditionalFOVValue = (int)(value);
    if (setting == GameSetting::CameraDistance) g_cameraDistanceMultiplier = value;
    if (setting == GameSetting::WorldTimeDilation) g_WorldTimeDilationValue = value;
    if (setting == GameSetting::AITimeDilation) {
        g_AITimeDilationValue = value;
        EnableCheats(Cheat::None);
    }
    if (setting == GameSetting::HUD) {
        g_HUDOffsets = ((int)value * screenWidth) / 100;
        HUDFixEnabled({ g_FullUI, g_MainMenu });
    }
}
// Getters for Reshade addon call
extern "C" __declspec(dllexport) void GetGameInfos(GameInfos* infos) {
    if (!infos) return;

    infos->FOVIn = g_FOV_In;
    infos->FOVOut = g_FOV_Out;
    infos->cameraIn = g_Camera_In;
    infos->cameraOut = g_Camera_Out;
    infos->consoleEnabled = g_Console_Enabled;
}
// Hook injections
static APawn* g_Enemy = nullptr;
static ACBP_James_Cooper_C* g_James = nullptr;
static void ProcessEvent() {
    if (!PEHook && ProcessEventaddress) {
        PEHook = safetyhook::create_mid(ProcessEventaddress + 0xc,
            [](SafetyHookContext& ctx) {
                UObject* object = (UObject*)ctx.rcx;
                UFunction* func = (UFunction*)ctx.rdx;

                if (object && func) {
                    std::string funcName = func->GetName();
                    std::string objectName = object->GetName();

                    if (object && func && object->IsA(APawn::StaticClass())) {
                        APawn* pawn = (APawn*)object;

                        if (funcName.contains("ReceiveTick")) { // Enable cheats based on Tick
                            if (!pawn->IsPlayerControlled() && pawn->Class->GetName().contains("BP_Zombie_C")) {
                                g_Enemy = pawn;
                                EnableCheats(Cheat::None);
                            }
                        }
                    }

                    if (objectName.contains("James_Cooper_C") && funcName == "IsPlayerControlled") { // Enable cheats based on Tick
                        if (object->IsA(ACBP_James_Cooper_C::StaticClass())) {
                            g_James = (ACBP_James_Cooper_C*)object;
                            EnableCheats(Cheat::None);
                        }
                    }
                    if (objectName.contains("QuickMenu") || objectName.contains("DeathScreen")) {
                        if (funcName == "OnDeath" || funcName == "OnInputEnabled") {
                            g_Enemy = nullptr;
                            g_James = nullptr;
                            g_MainMenu = nullptr;
                        }
                    }

                    if (objectName.contains("W_FullUI_C")) {
                        if (funcName == "Construct") g_FullUI = (UW_FullUI_C*)object;
                        if (funcName == "Destruct") g_FullUI = nullptr;
                    }
                    if (objectName.contains("W_MainMenu_C") && object->IsA(UUserWidget::StaticClass())) {
                        if (funcName == "Construct") {
                            g_MainMenu = (UUserWidget*)object;
                            HUDFixEnabled({ g_MainMenu });
                        }
                        if (funcName == "Destruct") g_MainMenu = nullptr;
                    }
                    // This will be our Tick to apply HUD fix
                    if (objectName.contains("BPC_InteractionHandler") && funcName.contains("ReceiveTick"))
                        HUDFixEnabled({ g_FullUI });
                }
            });
    }
}
// HUD fix hook UUserWidget -> AddToViewPort to log and know which HUD widget will be targeted 
static void HUDFixEnabled(const std::vector<UUserWidget*>& widgets) {
    if (!g_fix_enabled || !(g_HUD_fix_enabled || g_ultrawide_fix_enabled)) return;

    for (auto* widget : widgets) {
        if (!widget) continue;

        UWidget* root = widget->WidgetTree->RootWidget;
        if (!root || !root->IsA(UCanvasPanel::StaticClass())) continue;
        auto* panel = (UCanvasPanel*)root;
        if (!panel) continue;

        for (int i = 0; i < panel->Slots.Num(); i++) {
            UPanelSlot* slotBase = panel->Slots[i];
            if (!slotBase) continue;
            UWidget* content = slotBase->Content;
            if (!content) continue;
            // Pillarboxing
            if (content->GetName().contains("AspectRation") || content->GetName().contains("Fader")) {
                content->SetVisibility(g_ultrawide_fix_enabled ? ESlateVisibility::Collapsed : ESlateVisibility::Visible);
                continue;
            }
            // Set offsets to all other widgets
            if (slotBase->IsA(UCanvasPanelSlot::StaticClass())) {
                UCanvasPanelSlot* slot = (UCanvasPanelSlot*)slotBase;
                if (!slot) continue;

                FMargin slotOffsets = slot->GetOffsets();
                slotOffsets.Left = g_HUD_fix_enabled ? g_HUDOffsets : 0.f;
                slotOffsets.Right = g_HUD_fix_enabled ? g_HUDOffsets : 0.f;
                slot->SetOffsets(slotOffsets);
            }
        }
    }
}

static void LogHUD(GameFixes fix) {
    if (fix == GameFixes::HUD) logger->info("HUD fix {}", g_HUD_fix_enabled ? "enabled" : "disabled");
    if (fix == GameFixes::UltraWide) logger->info("Ultrawide fix {}", g_ultrawide_fix_enabled ? "enabled" : "disabled");
}

static void FOVFixEnabled() {
    if (g_fix_enabled && g_fov_fix_enabled && FOVaddress) {
        if (!FOVHook) { // Hook only once
            FOVHook = safetyhook::create_mid(FOVaddress + 0x10,
                [](SafetyHookContext& ctx) {
                    g_FOV_In = ctx.xmm0.f32[0];
                    ctx.xmm0.f32[0] += (g_fix_enabled && g_fov_fix_enabled ? g_AdditionalFOVValue : 0);
                    g_FOV_Out = ctx.xmm0.f32[0];
                });
        }
    }
    logger->info("FOV fix {}", g_fov_fix_enabled ? "enabled" : "disabled");
}

static void CameraFixEnabled() {
    if (g_fix_enabled && g_camera_fix_enabled && Cameraaddress) {
        if (!CameraHook) { // Hook only once
            CameraHook = safetyhook::create_mid(Cameraaddress + 0x8,
                [](SafetyHookContext& ctx) {
                    g_Camera_In = ctx.xmm0.f32[0];
                    ctx.xmm0.f32[0] *= g_cameraDistanceMultiplier;
                    g_Camera_Out = ctx.xmm0.f32[0];
                });
        }
        else CameraHook.enable();
    }
    if (!(g_fix_enabled && g_camera_fix_enabled) && Cameraaddress && CameraHook)
        CameraHook.disable();

    logger->info("Camera distance fix {}", g_fov_fix_enabled ? "enabled" : "disabled");
}

// Cheats
static double g_HealthReducePerSecond = 0;
static bool bIsReadHealthReducePerSecond = false;
static void EnableCheats(Cheat cheat) {
    if (WorldTimedilationaddress && !WorldTimeDilationHook) {
        WorldTimeDilationHook = safetyhook::create_mid(WorldTimedilationaddress + 0x10,
            [](SafetyHookContext& ctx) {
                // From AWorldSettings retrieved from world->K2_GetWorldSettings()
                ctx.xmm0.f32[0] *= g_TimeDilation_fix_enabled ? g_WorldTimeDilationValue : 1.f;
            });
    }
    // Enemies time dilation
    if (g_Enemy) g_Enemy->CustomTimeDilation = g_TimeDilation_fix_enabled ? g_AITimeDilationValue : 1.f;
    // Player cheats
    if (g_James && g_James->Class) {
        double maxHealth = g_James->BPC_HealthSystem->m_MaxHealth;
        double currentHealth = 0;
        if (maxHealth > 0) {
            if (!bIsReadHealthReducePerSecond) {
                g_HealthReducePerSecond = g_James->BPC_HealthSystem->m_HealthReducePerSecond;
                bIsReadHealthReducePerSecond = true;
            }
            g_James->BPC_HealthSystem->IsInvincible = g_GodMode_fix_enabled;
            g_James->BPC_HealthSystem->m_HealthReducePerSecond = g_GodMode_fix_enabled ? 0 : g_HealthReducePerSecond;
            g_James->BPC_HealthSystem->ReduceHealthFromStart = !g_GodMode_fix_enabled;
            currentHealth = g_James->BPC_HealthSystem->m_CurrentHealth;
            g_James->BPC_HealthSystem->m_CurrentHealth = g_GodMode_fix_enabled ? maxHealth : currentHealth;
        }
    }

    if (cheat == Cheat::TimeDilation) logger->info("Time dilation cheat {}", g_TimeDilation_fix_enabled ? "enabled" : "disabled");
    if (cheat == Cheat::GodMode) logger->info("God mode cheat {}", g_GodMode_fix_enabled ? "enabled" : "disabled");
}

// Memory patch fixes
static void VignettingFixEnabled() {
    if (g_fix_enabled && g_Vignetting_fix_enabled && Vignettingaddress)
        Memory::PatchBytes(Vignettingaddress, "\x31\xC9", 2); // xor ecx,ecx r.Tonemapper.Quality=0
    if (!(g_fix_enabled && g_Vignetting_fix_enabled) && Vignettingaddress)
        Memory::RestoreBytes(Vignettingaddress);

    logger->info("Vignetting fix {}", g_Vignetting_fix_enabled ? "enabled" : "disabled");
}

static void FogFixEnabled() {
    if (g_fix_enabled && g_Fog_fix_enabled && Fogaddress)
        Memory::PatchBytes(Fogaddress, "\xEB", 1); // jmp -> r.Fog 0
    if (!(g_fix_enabled && g_Fog_fix_enabled) && Fogaddress)
        Memory::RestoreBytes(Fogaddress);

    logger->info("Fog fix {}", g_Fog_fix_enabled ? "enabled" : "disabled");
}
// UE Console creation
static void EnableConsole() {
    if (g_Console_Enabled || !g_Console || !GObjectsaddress || !AppendStringaddress || !ProcessEventaddress) {
        if (!g_Console && !user_inputs_logged) {
            logger->info("------------------ User inputs ------------------");
            user_inputs_logged = true;
        }
        return;
    }

    logger->info("-------------- Console re-enabling --------------");
    ReactivateDevConsole(logger);
}
// Standard dll entry
BOOL APIENTRY DllMain(HMODULE hModule, DWORD reason, LPVOID) {
    if (reason == DLL_PROCESS_ATTACH) {
        logger = InitializeLogger("Fear the timeloop", PLUGIN_LOG);
        logger->info("Plugin {} loaded.", PLUGIN_NAME);
    }
    else if (reason == DLL_PROCESS_DETACH) {
        logger->info("Plugin {} unloaded.", PLUGIN_NAME);
        spdlog::drop_all();
    }
    return TRUE;
}