From d506cdc4c554100767df6985aef3bc227e922b4b Mon Sep 17 00:00:00 2001
From: Dev-Taehui <indyed3rd@naver.com>
Date: Wed, 1 Feb 2023 16:17:40 +0900
Subject: [PATCH] Provide DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING for
 CanvasSwapChain when creating or resizing for supporting VRR

---
 winrt/lib/drawing/CanvasDevice.cpp    | 1 +
 winrt/lib/drawing/CanvasSwapChain.cpp | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/winrt/lib/drawing/CanvasDevice.cpp b/winrt/lib/drawing/CanvasDevice.cpp
index 73ca5f185..0ae8d53da 100644
--- a/winrt/lib/drawing/CanvasDevice.cpp
+++ b/winrt/lib/drawing/CanvasDevice.cpp
@@ -1153,6 +1153,7 @@ namespace ABI { namespace Microsoft { namespace Graphics { namespace Canvas
         swapChainDesc.Scaling = DXGI_SCALING_STRETCH;
         swapChainDesc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL;
         swapChainDesc.AlphaMode = ToDxgiAlphaMode(alphaMode);
+        swapChainDesc.Flags = DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING;
 
         ComPtr<IDXGISwapChain1> swapChain;
         ThrowIfCreateSurfaceFailed(
diff --git a/winrt/lib/drawing/CanvasSwapChain.cpp b/winrt/lib/drawing/CanvasSwapChain.cpp
index 2301cacbc..f3b5e9676 100644
--- a/winrt/lib/drawing/CanvasSwapChain.cpp
+++ b/winrt/lib/drawing/CanvasSwapChain.cpp
@@ -551,7 +551,7 @@ namespace ABI { namespace Microsoft { namespace Graphics { namespace Canvas
             widthInPixels,
             heightInPixels,
             static_cast<DXGI_FORMAT>(newFormat), 
-            0));
+            DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING));
 
         if (m_isCoreWindowSwapChain)
         {