From c9d649d27cf3fcd0110647eb093113408e8e3a4f Mon Sep 17 00:00:00 2001
From: Stenzek <stenzek@gmail.com>
Date: Sun, 3 Sep 2017 16:33:47 +1000
Subject: [PATCH] D3D: Use Direct3D 11.1 where supported

---
 Source/Core/VideoBackends/D3D/D3DBase.cpp | 6 ++++++
 Source/Core/VideoBackends/D3D/D3DBase.h   | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/Source/Core/VideoBackends/D3D/D3DBase.cpp b/Source/Core/VideoBackends/D3D/D3DBase.cpp
index e4b16a36fb..e15f4e392e 100644
--- a/Source/Core/VideoBackends/D3D/D3DBase.cpp
+++ b/Source/Core/VideoBackends/D3D/D3DBase.cpp
@@ -33,6 +33,7 @@ int d3d_dll_ref = 0;
 namespace D3D
 {
 ID3D11Device* device = nullptr;
+ID3D11Device1* device1 = nullptr;
 ID3D11DeviceContext* context = nullptr;
 static IDXGISwapChain1* swapchain = nullptr;
 static ID3D11Debug* debug = nullptr;
@@ -377,6 +378,10 @@ HRESULT Create(HWND wnd)
     return E_FAIL;
   }
 
+  hr = device->QueryInterface<ID3D11Device1>(&device1);
+  if (FAILED(hr))
+    WARN_LOG(VIDEO, "Missing Direct3D 11.1 support. Logical operations will not be supported.");
+
   // prevent DXGI from responding to Alt+Enter, unfortunately DXGI_MWA_NO_ALT_ENTER
   // does not work so we disable all monitoring of window messages. However this
   // may make it more difficult for DXGI to handle display mode changes.
@@ -439,6 +444,7 @@ void Close()
   context->Flush();  // immediately destroy device objects
 
   SAFE_RELEASE(context);
+  SAFE_RELEASE(device1);
   ULONG references = device->Release();
 
 #if defined(_DEBUG) || defined(DEBUGFAST)
diff --git a/Source/Core/VideoBackends/D3D/D3DBase.h b/Source/Core/VideoBackends/D3D/D3DBase.h
index 224395a016..e1328494df 100644
--- a/Source/Core/VideoBackends/D3D/D3DBase.h
+++ b/Source/Core/VideoBackends/D3D/D3DBase.h
@@ -5,6 +5,7 @@
 #pragma once
 
 #include <d3d11.h>
+#include <d3d11_1.h>
 #include <d3dcompiler.h>
 #include <dxgi1_2.h>
 #include <vector>
@@ -56,6 +57,7 @@ HRESULT Create(HWND wnd);
 void Close();
 
 extern ID3D11Device* device;
+extern ID3D11Device1* device1;
 extern ID3D11DeviceContext* context;
 extern HWND hWnd;
 extern bool bFrameInProgress;