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#include "pch.h"
#include "latencyflex.h"
#include "hookutils.h"
#include "convar.h"
typedef void (*OnRenderStartType)();
OnRenderStartType OnRenderStart;
ConVar* Cvar_r_latencyflex;
HMODULE m_lfxModule {};
typedef void (*PFN_lfx_WaitAndBeginFrame)();
PFN_lfx_WaitAndBeginFrame m_lfx_WaitAndBeginFrame {};
void OnRenderStartHook()
{
// Sleep before next frame as needed to reduce latency.
if (Cvar_r_latencyflex->GetInt())
{
if (m_lfx_WaitAndBeginFrame)
{
m_lfx_WaitAndBeginFrame();
}
}
OnRenderStart();
}
void InitialiseLatencyFleX(HMODULE baseAddress)
{
// Connect to the LatencyFleX service
// LatencyFleX is an open source vendor agnostic replacement for Nvidia Reflex input latency reduction technology.
// https://ishitatsuyuki.github.io/post/latencyflex/
const auto lfxModuleName = "latencyflex_layer.dll";
const auto lfxModuleNameFallback = "latencyflex_wine.dll";
auto useFallbackEntrypoints = false;
// Load LatencyFleX library.
m_lfxModule = ::LoadLibraryA(lfxModuleName);
if (m_lfxModule == nullptr && ::GetLastError() == ERROR_MOD_NOT_FOUND)
{
spdlog::info("LFX: Primary LatencyFleX library not found, trying fallback.");
m_lfxModule = ::LoadLibraryA(lfxModuleNameFallback);
if (m_lfxModule == nullptr)
{
if (::GetLastError() == ERROR_MOD_NOT_FOUND)
{
spdlog::info("LFX: Fallback LatencyFleX library not found.");
}
else
{
spdlog::info("LFX: Error loading fallback LatencyFleX library - Code: {}", ::GetLastError());
}
return;
}
useFallbackEntrypoints = true;
}
else if (m_lfxModule == nullptr)
{
spdlog::info("LFX: Error loading primary LatencyFleX library - Code: {}", ::GetLastError());
return;
}
m_lfx_WaitAndBeginFrame = reinterpret_cast<PFN_lfx_WaitAndBeginFrame>(reinterpret_cast<void*>(
GetProcAddress(m_lfxModule, !useFallbackEntrypoints ? "lfx_WaitAndBeginFrame" : "winelfx_WaitAndBeginFrame")));
spdlog::info("LFX: Initialized.");
Cvar_r_latencyflex = new ConVar("r_latencyflex", "1", FCVAR_ARCHIVE, "Whether or not to use LatencyFleX input latency reduction.");
HookEnabler hook;
ENABLER_CREATEHOOK(hook, (char*)baseAddress + 0x1952C0, &OnRenderStartHook, reinterpret_cast<LPVOID*>(&OnRenderStart));
}
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