qt: Extract CAMetalLayer from NSView to pass to MoltenVK.

src/citra_qt/CMakeLists.txt

@@ -250,6 +250,8 @@ if (APPLE)
     set_target_properties(citra-qt PROPERTIES MACOSX_BUNDLE TRUE)
     set_target_properties(citra-qt PROPERTIES MACOSX_BUNDLE_INFO_PLIST ${CMAKE_CURRENT_SOURCE_DIR}/Info.plist)
     target_sources(citra-qt PRIVATE
+        applesurfacehelper.h
+        applesurfacehelper.mm
         macos_authorization.h
         macos_authorization.mm
     )

src/citra_qt/applesurfacehelper.h

@@ -0,0 +1,11 @@
+// Copyright 2022 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+namespace AppleSurfaceHelper {
+
+void* GetSurfaceLayer(void* surface);
+
+} // namespace AppleSurfaceHelper

src/citra_qt/applesurfacehelper.mm

@@ -0,0 +1,16 @@
+// Copyright 2022 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#import <Cocoa/Cocoa.h>
+
+#include "citra_qt/applesurfacehelper.h"
+
+namespace AppleSurfaceHelper {
+
+void* GetSurfaceLayer(void* surface) {
+    NSView* view = static_cast<NSView*>(surface);
+    return view.layer;
+}
+
+} // AppleSurfaceHelper

src/citra_qt/bootmanager.cpp

@@ -24,6 +24,10 @@
 #include "video_core/renderer_base.h"
 #include "video_core/video_core.h"
 
+#if defined(__APPLE__)
+#include "citra_qt/applesurfacehelper.h"
+#endif
+
 #if !defined(WIN32)
 #include <qpa/qplatformnativeinterface.h>
 #endif
@@ -334,8 +338,10 @@ static Frontend::EmuWindow::WindowSystemInfo GetWindowSystemInfo(QWindow* window
     wsi.type = GetWindowSystemType();
 
     // Our Win32 Qt external doesn't have the private API.
-#if defined(WIN32) || defined(__APPLE__)
+#if defined(WIN32)
     wsi.render_surface = window ? reinterpret_cast<void*>(window->winId()) : nullptr;
+#elif defined(__APPLE__)
+    wsi.render_surface = window ? AppleSurfaceHelper::GetSurfaceLayer(reinterpret_cast<void*>(window->winId())) : nullptr;
 #else
     QPlatformNativeInterface* pni = QGuiApplication::platformNativeInterface();
     wsi.display_connection = pni->nativeResourceForWindow("display", window);