From b48fcb0dc3df3b7d22a48945e3ec55ae2bca3c58 Mon Sep 17 00:00:00 2001
From: FakeMichau <49685661+FakeMichau@users.noreply.github.com>
Date: Tue, 20 Oct 2026 01:59:57 +0200
Subject: [PATCH] Ensure that ALLOW_TEARING is applied on swapchain resize with
 DLSSG

Slopped. FIxes a crash in BeamNG with DLSSG Dx12 output on resize
---
 OptiScaler/hooks/FG_Hooks.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/OptiScaler/hooks/FG_Hooks.cpp b/OptiScaler/hooks/FG_Hooks.cpp
index 843bead5..736533fa 100644
--- a/OptiScaler/hooks/FG_Hooks.cpp
+++ b/OptiScaler/hooks/FG_Hooks.cpp
@@ -661,6 +661,13 @@ HRESULT FGHooks::hkResizeBuffers(IDXGISwapChain* This, UINT BufferCount, UINT Wi
         }
     }
 
+    // DLSSG creates its swapchain with ALLOW_TEARING and DXGI rejects resizes that add or remove it
+    if (State::Instance().activeFgOutput == FGOutput::DLSSG && !(SwapChainFlags & DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING))
+    {
+        LOG_DEBUG("Keeping DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING for DLSSG");
+        SwapChainFlags |= DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING;
+    }
+
     LOG_DEBUG("BufferCount: {}, Width: {}, Height: {}, NewFormat:{}, SwapChainFlags: {:X}", BufferCount, Width, Height,
               (UINT) NewFormat, SwapChainFlags);
 
@@ -902,6 +909,13 @@ HRESULT FGHooks::hkResizeBuffers1(IDXGISwapChain3* This, UINT BufferCount, UINT
         }
     }
 
+    // DLSSG creates its swapchain with ALLOW_TEARING and DXGI rejects resizes that add or remove it
+    if (State::Instance().activeFgOutput == FGOutput::DLSSG && !(SwapChainFlags & DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING))
+    {
+        LOG_DEBUG("Keeping DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING for DLSSG");
+        SwapChainFlags |= DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING;
+    }
+
     LOG_DEBUG("BufferCount: {}, Width: {}, Height: {}, NewFormat:{}, SwapChainFlags: {:X}, Caller: {}", BufferCount,
               Width, Height, (UINT) Format, SwapChainFlags, Util::WhoIsTheCaller(_ReturnAddress()));