From 7446d3c58a52254ec5d8d1bed3824a8a5c855efa Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Tue, 26 Nov 2019 15:36:20 +0100
Subject: [PATCH] [dxgi] Don't allow changing the FRAME_LATENCY_WAITABLE_OBJECT
 flag

---
 src/dxgi/dxgi_swapchain.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/dxgi/dxgi_swapchain.cpp b/src/dxgi/dxgi_swapchain.cpp
index d41027747..be385a2ec 100644
--- a/src/dxgi/dxgi_swapchain.cpp
+++ b/src/dxgi/dxgi_swapchain.cpp
@@ -281,6 +281,11 @@ namespace dxvk {
           UINT        SwapChainFlags) {
     if (!IsWindow(m_window))
       return DXGI_ERROR_INVALID_CALL;
+
+    constexpr UINT PreserveFlags = DXGI_SWAP_CHAIN_FLAG_FRAME_LATENCY_WAITABLE_OBJECT;
+
+    if ((m_desc.Flags & PreserveFlags) != (SwapChainFlags & PreserveFlags))
+      return DXGI_ERROR_INVALID_CALL;
     
     std::lock_guard<std::mutex> lock(m_lockBuffer);
     m_desc.Width  = Width;