From 17320776f0d1cb642fdf35b592bfe7309cb0fa74 Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Thu, 1 Sep 2022 16:36:47 +0200
Subject: [PATCH] [dxgi] Duplicate frame latency handle

Apps can call CloseHandle on this.
---
 src/d3d11/d3d11_swapchain.cpp | 13 ++++++++++++-
 src/d3d11/d3d11_swapchain.h   |  2 ++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/d3d11/d3d11_swapchain.cpp b/src/d3d11/d3d11_swapchain.cpp
index 8e007e7d5..21772d539 100644
--- a/src/d3d11/d3d11_swapchain.cpp
+++ b/src/d3d11/d3d11_swapchain.cpp
@@ -115,7 +115,18 @@ namespace dxvk {
 
 
   HANDLE STDMETHODCALLTYPE D3D11SwapChain::GetFrameLatencyEvent() {
-    return m_frameLatencyEvent;
+    HANDLE result = nullptr;
+
+    if (!m_processHandle)
+      m_processHandle = GetCurrentProcess();
+
+    if (!DuplicateHandle(m_processHandle, m_frameLatencyEvent,
+        m_processHandle, &result, 0, FALSE, DUPLICATE_SAME_ACCESS)) {
+      Logger::err("DxgiSwapChain::GetFrameLatencyWaitableObject: DuplicateHandle failed");
+      return nullptr;
+    }
+
+    return result;
   }
 
 
diff --git a/src/d3d11/d3d11_swapchain.h b/src/d3d11/d3d11_swapchain.h
index f4debea14..8a006a153 100644
--- a/src/d3d11/d3d11_swapchain.h
+++ b/src/d3d11/d3d11_swapchain.h
@@ -109,6 +109,8 @@ namespace dxvk {
     HANDLE                  m_frameLatencyEvent = nullptr;
     Rc<sync::CallbackFence> m_frameLatencySignal;
 
+    HANDLE                  m_processHandle = nullptr;
+
     bool                    m_dirty = true;
     bool                    m_vsync = true;