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wo4u_performance.cpp
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#define NOMINMAX
#define WINMM
#include <Windows.h>
#include <map>
#include <filesystem>
#include <stack>
#include "zmod_common.cpp"
typedef void(fn_7024D0_t)(LARGE_INTEGER *lpPerformanceCount, uint64_t vsync_30);
fn_7024D0_t wait_loop;
struct
{
double frequency;
double target_fps;
double dt_target;
double dt_sleep;
double late_frame_compensation_multiplier;
} globals;
template <typename T, typename U>
int32_t rel(T *next_instruction, U *absolute)
{
return (int32_t)((intptr_t)absolute - (intptr_t)next_instruction);
}
template <typename T, typename U>
void setup_jmp(T *pounce, U *splat)
{
auto jmp = zmod::parse_hex("E9 ?? ?? ?? ??", rel(pounce + 5, splat));
zmod::write_memory(pounce, jmp.data(), jmp.size());
}
template <typename T, typename U>
void setup_call(T *pounce, U *splat)
{
auto jmp = zmod::parse_hex("E8 ?? ?? ?? ??", rel(pounce + 5, splat));
zmod::write_memory(pounce, jmp.data(), jmp.size());
}
void wait_loop(LARGE_INTEGER *lpPerformanceCount, uint64_t vsync_30)
{
auto dt_target = globals.dt_target;
auto dt_sleep = globals.dt_sleep;
auto lfcm = globals.late_frame_compensation_multiplier;
LARGE_INTEGER now;
QueryPerformanceCounter(&now);
auto dt = (double)(now.QuadPart - lpPerformanceCount->QuadPart) / globals.frequency;
if (dt < dt_target * lfcm)
{
while (dt < dt_sleep)
{
Sleep(1);
QueryPerformanceCounter(&now);
dt = (double)(now.QuadPart - lpPerformanceCount->QuadPart) / globals.frequency;
}
while (dt < dt_target)
{
QueryPerformanceCounter(&now);
dt = (double)(now.QuadPart - lpPerformanceCount->QuadPart) / globals.frequency;
}
lpPerformanceCount->QuadPart = lpPerformanceCount->QuadPart + (LONGLONG)(dt_target * globals.frequency); // Prevent drift
}
else
{
lpPerformanceCount->QuadPart = now.QuadPart; // Prevent the game from speeding up if dt >= dt_target * lfcm
}
}
void setup_wait_loop_hook()
{
auto wo4u = zmod::get_base_address(L"WO4U.dll");
auto addr = zmod::find_pattern(wo4u, 0xFFFFFF, "48 8B 8F 08 18 00 00") - 5;
setup_call(addr, wait_loop);
}
void setup_speed_hook()
{
static const uint8_t code[64] = {};
zmod::unprotect(code, sizeof(code));
auto wo4u = zmod::get_base_address(L"WO4U.dll");
auto jmp_site = zmod::find_pattern(wo4u, 0xFFFFFF, "F3 48 0F 2A C9 48 8B C8");
auto speed = (float)(60.0 / globals.target_fps);
auto patch = zmod::parse_hex("F3 0F 10 0D 05 00 00 00 E9 ?? ?? ?? ?? ?? ?? ?? ??", rel(code + 13, jmp_site + 5), speed);
zmod::write_memory_unsafe(code, patch.data(), patch.size());
setup_jmp(jmp_site, code);
}
void setup_camera_speed_hook()
{
static const uint8_t code[64] = {};
zmod::unprotect(code, sizeof(code));
auto wo4u = zmod::get_base_address(L"WO4U.dll");
auto jmp_site = zmod::find_pattern(wo4u, 0xFFFFFF, "F3 48 0F 2A C0 F3 0F 11 46 10");
auto speed = (float)(60.0 / globals.target_fps);
auto patch = zmod::parse_hex("F3 0F 10 05 05 00 00 00 E9 ?? ?? ?? ?? ?? ?? ?? ??", rel(code + 13, jmp_site + 5), speed);
zmod::write_memory_unsafe(code, patch.data(), patch.size());
setup_jmp(jmp_site, code);
}
void setup_musou_camera_speed_hook()
{
static const uint8_t code[64] = {};
zmod::unprotect(code, sizeof(code));
auto wo4u = zmod::get_base_address(L"WO4U.dll");
auto jmp_site = zmod::find_pattern(wo4u, 0xFFFFFF, "F3 48 0F 2A C0 F3 0F 11 84 8B 78 01 00 00");
auto speed = (float)(60.0 / globals.target_fps);
auto patch = zmod::parse_hex("F3 0F 10 05 05 00 00 00 E9 ?? ?? ?? ?? ?? ?? ?? ??", rel(code + 13, jmp_site + 5), speed);
zmod::write_memory_unsafe(code, patch.data(), patch.size());
setup_jmp(jmp_site, code);
}
void setup_physics_speed_hook()
{
static const uint8_t code[64] = {};
zmod::unprotect(code, sizeof(code));
auto wo4u = zmod::get_base_address(L"WO4U.dll");
auto jmp_site = zmod::find_pattern(wo4u, 0xFFFFFF, "F3 48 0F 2A F0 F3 0F 59 35 ?? ?? ?? ?? 48 83 7F 48 00");
auto speed = (float)(60.0 / globals.target_fps);
auto patch = zmod::parse_hex("F3 0F 10 35 05 00 00 00 E9 ?? ?? ?? ?? ?? ?? ?? ??", rel(code + 13, jmp_site + 5), speed);
zmod::write_memory_unsafe(code, patch.data(), patch.size());
setup_jmp(jmp_site, code);
}
// Particle lifetime is based on frame rate. This hook only adjusts particle and effect speed.
void setup_effects_speed_hook()
{
static const uint8_t code[64] = {};
zmod::unprotect(code, sizeof(code));
auto wo4u = zmod::get_base_address(L"WO4U.dll");
auto jmp_site = zmod::find_pattern(wo4u, 0xFFFFFF, "F3 48 0F 2A C0 8B 01");
auto speed = (float)(60.0 / globals.target_fps);
auto patch = zmod::parse_hex("F3 0F 10 05 05 00 00 00 E9 ?? ?? ?? ?? ?? ?? ?? ??", rel(code + 13, jmp_site + 5), speed);
zmod::write_memory_unsafe(code, patch.data(), patch.size());
setup_jmp(jmp_site, code);
}
void setup_rim_lighting_hook()
{
static const uint8_t code[64] = {};
zmod::unprotect(code, sizeof(code));
auto wo4u = zmod::get_base_address(L"WO4U.dll");
auto jmp_site = zmod::find_pattern(wo4u, 0xFFFFFF, "F3 0F 58 83 D8 34 00 00") - 13;
auto speed = (float)(60.0 / globals.target_fps);
auto patch = zmod::parse_hex("F3 0F 10 05 05 00 00 00 E9 ?? ?? ?? ?? ?? ?? ?? ??", rel(code + 13, jmp_site + 5), speed);
zmod::write_memory_unsafe(code, patch.data(), patch.size());
setup_jmp(jmp_site, code);
}
void module_main(HINSTANCE hinstDLL)
{
zmod::ini ini = {
{{L"zmod_wo4u_performance", L"global_speed_multiplier"}, L"1.0"},
{{L"zmod_wo4u_performance", L"late_frame_compensation_multiplier"}, L"1.0"},
{{L"zmod_wo4u_performance", L"target_fps"}, L"60.0"},
};
auto ini_path = zmod::get_module_path(hinstDLL).replace_filename(L"zmod_wo4u_performance.ini");
if (zmod::file_exists(ini_path))
{
zmod::read_ini_file(ini_path, ini);
}
else
{
zmod::write_ini_file(ini_path, ini);
}
zmod::set_timer_resolution();
LARGE_INTEGER frequency;
QueryPerformanceFrequency(&frequency);
globals.frequency = (double)frequency.QuadPart;
auto target_fps = std::wcstof(ini[{L"zmod_wo4u_performance", L"target_fps"}].c_str(), nullptr);
auto dt_target = 1.0 / (target_fps * std::wcstod(ini[{L"zmod_wo4u_performance", L"global_speed_multiplier"}].c_str(), nullptr));
globals.target_fps = target_fps;
globals.dt_target = dt_target;
globals.dt_sleep = dt_target - 0.0016;
globals.late_frame_compensation_multiplier = std::max(1.0, std::wcstod(ini[{L"zmod_wo4u_performance", L"late_frame_compensation_multiplier"}].c_str(), nullptr));
setup_wait_loop_hook();
setup_speed_hook();
setup_camera_speed_hook();
setup_musou_camera_speed_hook();
setup_physics_speed_hook();
setup_effects_speed_hook();
setup_rim_lighting_hook();
}
BOOL WINAPI DllMain(HINSTANCE hinstDll, DWORD fdwReason, LPVOID lpReserved)
{
switch (fdwReason)
{
case DLL_PROCESS_ATTACH:
if (!(DisableThreadLibraryCalls(hinstDll)))
;
if (zmod::get_module_path(NULL).filename().wstring().find(L"WO4.exe") == std::wstring::npos)
{
return FALSE;
}
module_main(hinstDll);
break;
}
return TRUE;
}