From d1a146ab01b999ad77a3b7b11a5e533f0e6f2faf Mon Sep 17 00:00:00 2001
From: FakeMichau <49685661+FakeMichau@users.noreply.github.com>
Date: Fri, 23 Oct 2026 02:27:01 +0200
Subject: [PATCH] Fix AL2 to AL2 conversion when using FSRFG

Slopped.
---
 OptiScaler/low_latency/input/input_antilag2.cpp |  2 +-
 OptiScaler/low_latency/input/input_common.cpp   | 12 ++++++++++--
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/OptiScaler/low_latency/input/input_antilag2.cpp b/OptiScaler/low_latency/input/input_antilag2.cpp
index 47f73de3..be3d6c66 100644
--- a/OptiScaler/low_latency/input/input_antilag2.cpp
+++ b/OptiScaler/low_latency/input/input_antilag2.cpp
@@ -29,7 +29,7 @@ HRESULT STDMETHODCALLTYPE AmdExtAntiLagApi::UpdateAntiLagState(VOID* pData)
 
         result = InputCommon::set_marker(inputContext, device, markerParams);
 
-        if (result != InputResult::Ok)
+        if (result != InputResult::Ok && result != InputResult::UsingDifferentInput)
         {
             LOG_ERROR("set_marker result: {}", magic_enum::enum_name(result));
             return E_FAIL;
diff --git a/OptiScaler/low_latency/input/input_common.cpp b/OptiScaler/low_latency/input/input_common.cpp
index 07f8d4d7..85b535cd 100644
--- a/OptiScaler/low_latency/input/input_common.cpp
+++ b/OptiScaler/low_latency/input/input_common.cpp
@@ -1448,8 +1448,16 @@ void InputCommon::update()
 
 InputResult InputCommon::mark_present_start(IUnknown* pDevice)
 {
-    // TODO: could allow AL2 but need to check the InputMarkerMode of the active AL2 input
-    if (activeInput != LowLatencyInput::UeLowLatency)
+    auto fg = State::Instance().CurrentFG();
+    bool fsrfgTypesFrames =
+        State::Instance().activeFgOutput == FGOutput::FSRFG && fg != nullptr && fg->IsActive() && !fg->IsPaused();
+
+    // UE only sends simulation markers
+    bool marksEnds =
+        activeInput == LowLatencyInput::UeLowLatency || (activeInput == LowLatencyInput::AntiLag2 && fsrfgTypesFrames &&
+                                                         !reports_frame_generation(LowLatencyInput::AntiLag2));
+
+    if (!marksEnds)
         return InputResult::InputNotSupported;
 
     // TODO: this is missing the frame id required by other outputs