Support for refresh rate and sync interval (#2989)

* Add support for querying the refresh rate and sync interval

Code/Framework/AzFramework/Platform/Mac/AzFramework/Windowing/NativeWindow_Mac.mm

@@ -34,12 +34,14 @@ namespace AzFramework
         bool GetFullScreenState() const override;
         void SetFullScreenState(bool fullScreenState) override;
         bool CanToggleFullScreenState() const override { return true; }
+        uint32_t GetMainDisplayRefreshRate() const override;
 
     private:
         static NSWindowStyleMask ConvertToNSWindowStyleMask(const WindowStyleMasks& styleMasks);
 
         NSWindow* m_nativeWindow;
         NSString* m_windowTitle;
+        uint32_t m_mainDisplayRefreshRate = 0;
     };
 
     NativeWindow::Implementation* NativeWindow::Implementation::Create()
@@ -76,6 +78,17 @@ namespace AzFramework
         // Make the window active
         [m_nativeWindow makeKeyAndOrderFront:nil];
         m_nativeWindow.title = m_windowTitle;
+
+        CGDirectDisplayID display = CGMainDisplayID();
+        CGDisplayModeRef currentMode = CGDisplayCopyDisplayMode(display);
+        m_mainDisplayRefreshRate = CGDisplayModeGetRefreshRate(currentMode);
+
+        // Assume 60hz if 0 is returned.
+        // This can happen on OSX. In future we can hopefully use maximumFramesPerSecond which wont have this issue
+        if (m_mainDisplayRefreshRate == 0)
+        {
+            m_mainDisplayRefreshRate = 60;
+        }
     }
 
     NativeWindowHandle NativeWindowImpl_Darwin::GetWindowHandle() const
@@ -128,4 +141,9 @@ namespace AzFramework
         const NSWindowStyleMask defaultMask = NSWindowStyleMaskResizable | NSWindowStyleMaskTitled | NSWindowStyleMaskClosable | NSWindowStyleMaskMiniaturizable;
         return nativeMask ? nativeMask : defaultMask;
     }
+
+    uint32_t NativeWindowImpl_Darwin::GetMainDisplayRefreshRate() const
+    {
+        return m_mainDisplayRefreshRate;
+    }
 } // namespace AzFramework