ReshadePluginsCore/Reanimal/dllmain.cpp

#include "CommonHeaders.h"
#include "CommonUEHeaders.h"

using namespace SDK;

// Constants
const std::string PLUGIN_NAME = "Reanimal";
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 std::atomic<bool> g_fix_enabled = false;
static std::atomic<bool> g_fov_fix_enabled = false;
static std::atomic<bool> g_ultrawide_fix_enabled = false;
static std::atomic<bool> g_HUD_fix_enabled = false;
static std::atomic<bool> g_Camera_fix_enabled = false;
static std::atomic<bool> g_DOF_fix_enabled = false;
static std::atomic<bool> g_CA_fix_enabled = false;
static std::atomic<bool> g_Vignetting_fix_enabled = false;
static std::atomic<bool> g_Fog_fix_enabled = false;
static std::atomic<bool> g_TimeDilation_fix_enabled = false;
static int g_AdditionalFOVValue = 0;
static float g_WorldTimeDilationValue = 1.f;
static bool user_inputs_logged = false;

// Shared values
static float g_FOV_In = 80.f;
static float g_CompensatedFOV = 80.f;
static float g_FOV_Out = 80.f;

// AOB Scan pointers
static uint8_t* FOVaddress = nullptr;
static uint8_t* WorldTimedilationaddress = nullptr;
static uint8_t* CameraStruct1address = nullptr;

// Hooking
static SafetyHookMid FOVHook{};
static SafetyHookMid PEHook{};
static SafetyHookMid WorldTimeDilationHook{};
static SafetyHookMid CameraStruct1Hook{};

// Prototypes
static void FOVFixEnabled();
static void UltraWideFixEnabled(GameFixes fix);
static void EnableConsole();
static void EnableCheats(Cheat cheat);
static void ProcessEvent();

extern "C" __declspec(dllexport) void SetFixEnabled(bool enabled, bool init) {
    g_fix_enabled = enabled;
    if (init) {
        logger = InitializeLogger("Reanimal", PLUGIN_LOG);
        logger->info("Plugin {} loaded.", PLUGIN_NAME);
	}
    if (!AOBScanDone) { // Unreal Engine 5.4.4
        logger->info("--------------- AOB scan started ---------------");
        constexpr auto FOVStringObfuscated = make_obfuscated<0xF3>("77 ?? 48 ?? ?? FF 90 ?? ?? ?? ?? F3 0F ?? ?? ?? 48 83 ?? ?? C3");
        constexpr auto WorldTimeDilationStringObfuscated = make_obfuscated<0x59>("F3 0F 10 ?? ?? ?? ?? ?? F3 0F 59 ?? ?? ?? ?? ?? F3 0F 59 ?? ?? ?? ?? ?? C3");
        constexpr auto CameraStruct1StringObfuscated = make_obfuscated<0x48>("48 89 ?? ?? ?? 57 48 83 ?? ?? 0F ?? ?? 48 8B FA 48 ?? ?? 0F ?? ?? F2 0F 10");

        using AOBScan::Make;
        using OffsetScan::Make;
        // Prepare all data for scanning
        std::vector<AOBScanEntry> signatures = {
            Make(&FOVaddress, FOVStringObfuscated, "FOV"),
            Make(&CameraStruct1address, CameraStruct1StringObfuscated, "Camera"),
            Make(&WorldTimedilationaddress, WorldTimeDilationStringObfuscated, "World time dilation")
        };
        // Scan all signature in a batch
        Memory::AOBScanBatch(signatures, logger);

        if (FOVaddress && WorldTimedilationaddress && CameraStruct1address)
            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 GWorldStringObfuscated = make_obfuscated<0x8D>("48 8B 05 ?? ?? ?? ?? 48 ?? ?? 75 ?? 48 83 ?? ?? 5B C3");
            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(&GWorldaddress, GWorldStringObfuscated, "Gworld", OffsetCalcType::GetOffsetFromOpcode, &Offsets::GWorld, 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;
    }

    ProcessEvent();
    if (init) return;
    FOVFixEnabled();
    UltraWideFixEnabled(GameFixes::UltraWide);
    gPendingDOF = true;
    gPendingCA = true;
    gPendingVignetting = true;
    gPendingFog = true;
    LogFixToggle(GameFixes::None, g_fix_enabled);
}

// Setters for Reshade addon call
extern "C" __declspec(dllexport) void SetFixesEnabled(GameFixes fix, bool enabled) { // Set each fix individually
    bool bVisual = g_fix_enabled && enabled;
    if (fix == GameFixes::DevConsole)           { g_Console = enabled; EnableConsole(); }
    if (fix == GameFixes::FOV)                  { g_fov_fix_enabled = enabled; FOVFixEnabled(); }
    if (fix == GameFixes::UltraWide)            { g_ultrawide_fix_enabled = enabled; UltraWideFixEnabled(GameFixes::UltraWide); }
    if (fix == GameFixes::DOF)                  { g_DOF_fix_enabled = enabled; gPendingDOF = true; LogFixToggle(fix, bVisual); }
    if (fix == GameFixes::ChromaticAberrations) { g_CA_fix_enabled = enabled; gPendingCA = true; LogFixToggle(fix, bVisual); }
    if (fix == GameFixes::Vignetting)           { g_Vignetting_fix_enabled = enabled; gPendingVignetting = true; LogFixToggle(fix, bVisual); }
    if (fix == GameFixes::Fog)                  { g_Fog_fix_enabled = enabled; gPendingFog = true; LogFixToggle(fix, bVisual); }
    if (fix == GameFixes::TimeDilation)         { g_TimeDilation_fix_enabled = enabled; EnableCheats(Cheat::TimeDilation); }
}

extern "C" __declspec(dllexport) void SetValues(GameSetting setting, float value) {
    if (setting == GameSetting::FOV) g_AdditionalFOVValue = (int)(value);
    if (setting == GameSetting::WorldTimeDilation) g_WorldTimeDilationValue = value;
}
// Getters for Reshade addon call
extern "C" __declspec(dllexport) void GetGameInfos(GameInfos* infos) {
    if (!infos) return;

    infos->FOVIn = g_FOV_In;
    infos->CompensatedFOV = g_CompensatedFOV;
    infos->FOVOut = g_FOV_Out;
    infos->consoleEnabled = g_Console_Enabled;
}

static bool g_inCutscene = false;
// Code injection functions
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 (objectName.contains("BP_CinematicCameraMode")) {
                        if (funcName == "BeginMode") g_inCutscene = true;
                        if (funcName == "EndMode") g_inCutscene = false;
                    }
                }
            });
    }
}

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

static void UltraWideFixEnabled(GameFixes fix) {
    if (!CameraStruct1Hook && CameraStruct1address) { // Taken FROM UUU
        CameraStruct1Hook = safetyhook::create_mid(CameraStruct1address,
            [](SafetyHookContext& ctx) {
                if (!ctx.rdx) return;
                FMinimalViewInfo* view = (FMinimalViewInfo*)ctx.rdx;
                if (!view) return;

                if (g_fix_enabled && g_ultrawide_fix_enabled) {
                    view->bConstrainAspectRatio = false;
                    view->AspectRatio = aspectRatio;
                }
                else {
                    view->bConstrainAspectRatio = true;
                    view->AspectRatio = baseAspect;
                }
            });
    }
    logger->info("Ultrawide fix {}", g_fix_enabled && g_ultrawide_fix_enabled ? "enabled" : "disabled");
}

// Cheats
static UWorld* LastWorld = nullptr;
static ULONGLONG lastScanTick = 0; // Last time Actors were scanned for enemies time dilation
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;
                // Apply visual effects only in hook main thread to ensure they will be applied correctly
                if (!g_Console_Enabled) return; // It relies on dev console being reactivated
                if (gPendingFog.exchange(false))
                    ApplyVisualEffect(GameFixes::Fog, g_fix_enabled && g_Fog_fix_enabled);
                if (gPendingDOF.exchange(false))
                    ApplyVisualEffect(GameFixes::DOF, g_fix_enabled && g_DOF_fix_enabled);
                if (gPendingCA.exchange(false))
                    ApplyVisualEffect(GameFixes::ChromaticAberrations, g_fix_enabled && g_CA_fix_enabled);
                if (gPendingVignetting.exchange(false))
                    ApplyVisualEffect(GameFixes::Vignetting, g_fix_enabled && g_Vignetting_fix_enabled);
            });
    }
    if (cheat == Cheat::TimeDilation) logger->info("Time dilation cheat {}", g_TimeDilation_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_DETACH) {
        logger->info("Plugin {} unloaded.", PLUGIN_NAME);
        spdlog::drop_all();
    }
    return TRUE;
}