Add Mac platform

Source/Engine/Platform/Mac/MacWindow.cpp

@@ -0,0 +1,103 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+#if PLATFORM_MAC
+
+#include "../Window.h"
+
+MacWindow::MacWindow(const CreateWindowSettings& settings)
+    : WindowBase(settings)
+{
+    int32 x = Math::TruncToInt(settings.Position.X);
+    int32 y = Math::TruncToInt(settings.Position.Y);
+    int32 clientWidth = Math::TruncToInt(settings.Size.X);
+    int32 clientHeight = Math::TruncToInt(settings.Size.Y);
+    int32 windowWidth = clientWidth;
+    int32 windowHeight = clientHeight;
+    _clientSize = Vector2((float)clientWidth, (float)clientHeight);
+
+    // TODO: setup window
+}
+
+MacWindow::~MacWindow()
+{
+    // TODO: close window
+}
+
+void* MacWindow::GetNativePtr() const
+{
+    // TODO: return window handle
+    return nullptr;
+}
+
+void MacWindow::Show()
+{
+    if (!_visible)
+    {
+        InitSwapChain();
+        if (_showAfterFirstPaint)
+        {
+            if (RenderTask)
+                RenderTask->Enabled = true;
+            return;
+        }
+
+        // Show
+        // TODO: show window
+        _focused = true;
+
+        // Base
+        WindowBase::Show();
+    }
+}
+
+void MacWindow::Hide()
+{
+    if (_visible)
+    {
+        // Hide
+        // TODO: hide window
+
+        // Base
+        WindowBase::Hide();
+    }
+}
+
+void MacWindow::Minimize()
+{
+    // TODO: Minimize
+}
+
+void MacWindow::Maximize()
+{
+    // TODO: Maximize
+}
+
+void MacWindow::Restore()
+{
+    // TODO: Restore
+}
+
+bool MacWindow::IsClosed() const
+{
+    return false;
+}
+
+bool MacWindow::IsForegroundWindow() const
+{
+    return Platform::GetHasFocus();
+}
+
+void MacWindow::SetIsFullscreen(bool isFullscreen)
+{
+}
+
+void MacWindow::GetScreenInfo(int32& x, int32& y, int32& width, int32& height) const
+{
+    // TODO: proper screen info
+    x = 0;
+    y = 0;
+    width = (int32)_clientSize.X;
+    height = (int32)_clientSize.Y;
+}
+
+#endif