[D3D12] Include recent D3D12 headers from the Microsoft GitHub

.gitmodules

@@ -85,3 +85,6 @@
 [submodule "third_party/VulkanMemoryAllocator"]
 	path = third_party/VulkanMemoryAllocator
 	url = https://github.com/GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator.git
+[submodule "third_party/DirectX-Headers"]
+	path = third_party/DirectX-Headers
+	url = https://github.com/microsoft/DirectX-Headers.git

src/xenia/ui/d3d12/d3d12_api.h

@@ -13,11 +13,17 @@
 // Must be included before D3D and DXGI for things like NOMINMAX.
 #include "xenia/base/platform_win.h"
 
+// Include the up to date versions of the headers of DXGI and Direct3D 12 rather
+// than the ones from the Windows SDK before other headers that may also
+// potentially include their headers.
+
+#include "xenia/ui/dxgi_include_win.h"
+
+#include "third_party/DirectX-Headers/include/directx/d3d12.h"
+#include "third_party/DirectX-Headers/include/directx/d3d12sdklayers.h"
+
 #include <DXProgrammableCapture.h>
-#include <d3d12.h>
-#include <d3d12sdklayers.h>
 #include <d3dcompiler.h>
-#include <dxgi1_5.h>
 #include <dxgidebug.h>
 // For Microsoft::WRL::ComPtr.
 #include <wrl/client.h>

src/xenia/ui/dxgi_include_win.h

@@ -0,0 +1,23 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2026 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_UI_DXGI_INCLUDE_WIN_H_
+#define XENIA_UI_DXGI_INCLUDE_WIN_H_
+
+// Must be included before Windows headers for definitions like NOMINMAX.
+#include "xenia/base/platform_win.h"
+
+// Include the up to date versions of the DXGI header dependencies rather than
+// the ones from the Windows SDK before including the DXGI header.
+#include "third_party/DirectX-Headers/include/directx/dxgicommon.h"
+#include "third_party/DirectX-Headers/include/directx/dxgiformat.h"
+
+#include <dxgi1_5.h>
+
+#endif  // XENIA_UI_DXGI_INCLUDE_WIN_H_

src/xenia/ui/presenter.h

@@ -39,7 +39,8 @@
 // Windows handle types.
 #include "xenia/base/platform_win.h"
 
-#include <dxgi.h>
+#include "xenia/ui/dxgi_include_win.h"
+
 #include <wrl/client.h>
 #endif  // XE_PLATFORM
 

src/xenia/ui/window_win.h

@@ -19,8 +19,9 @@
 // Must be included before Windows headers for things like NOMINMAX.
 #include "xenia/base/platform_win.h"
 
+#include "xenia/ui/dxgi_include_win.h"
+
 #include <ShellScalingApi.h>
-#include <dxgi.h>
 
 namespace xe {
 namespace ui {

third_party/DirectX-Headers

@@ -0,0 +1 @@
+Subproject commit 33374754f65baac0500dda6187e371136357246f