WebGPU: Added macOS backing size auto-detection in swap chain configuration

Author: MikhailGorobets

Graphics/GraphicsEngineWebGPU/src/SwapChainWebGPUImpl.cpp

@@ -1,5 +1,5 @@
 /*
- *  Copyright 2023-2025 Diligent Graphics LLC
+ *  Copyright 2023-2026 Diligent Graphics LLC
  *
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -262,6 +262,8 @@ void SwapChainWebGPUImpl::ConfigureSurface()
 
         m_SwapChainDesc.Width  = WindowRect.right - WindowRect.left;
         m_SwapChainDesc.Height = WindowRect.bottom - WindowRect.top;
+#elif PLATFORM_MACOS
+        m_NativeWindow.GetBackingSize(m_SwapChainDesc.Width, m_SwapChainDesc.Height);
 #elif PLATFORM_WEB
         int32_t CanvasWidth  = 0;
         int32_t CanvasHeight = 0;

Platforms/Apple/interface/MacOSNativeWindow.h

@@ -1,5 +1,5 @@
 /*
- *  Copyright 2019-2024 Diligent Graphics LLC
+ *  Copyright 2019-2026 Diligent Graphics LLC
  *  Copyright 2015-2019 Egor Yusov
  *
  *  Licensed under the Apache License, Version 2.0 (the "License");
@@ -28,6 +28,7 @@
 #pragma once
 
 #include "../../../Primitives/interface/CommonDefinitions.h"
+#include "../../../Primitives/interface/BasicTypes.h"
 
 DILIGENT_BEGIN_NAMESPACE(Diligent)
 
@@ -44,6 +45,8 @@ struct MacOSNativeWindow
     {}
 
     void* GetLayer() const;
+
+    void GetBackingSize(Uint32& Width, Uint32& Height) const;
 #endif
 };
 

Platforms/Apple/src/MacOSNativeWindow.mm

@@ -23,6 +23,7 @@
  */
 
 #include "MacOSNativeWindow.h"
+#include "BasicTypes.h"
 
 #import <AppKit/AppKit.h>
 
@@ -34,4 +35,20 @@
     return pNSView ? (__bridge void*)((__bridge NSView*)pNSView).layer : nullptr;
 }
 
+void MacOSNativeWindow::GetBackingSize(Uint32& Width, Uint32& Height) const
+{
+    if (pNSView)
+    {
+        NSView* nsView = (__bridge NSView*)pNSView;
+        NSRect  viewRectPixels = [nsView convertRectToBacking:[nsView bounds]];
+        Width  = static_cast<Uint32>(viewRectPixels.size.width);
+        Height = static_cast<Uint32>(viewRectPixels.size.height);
+    }
+    else
+    {
+        Width  = 0;
+        Height = 0;
+    }
+}
+
 } // namespace Diligent