add direct3D

GDP/D3D9/Window.cpp

@@ -12,17 +12,21 @@ INT Window::init(HINSTANCE hInstance, UINT width, UINT height)
     wc.hbrBackground = CreateSolidBrush(RGB(0, 255, 0));
     wc.hCursor = LoadCursor(nullptr, IDC_ARROW);
     wc.hIcon = LoadIcon(nullptr, IDI_APPLICATION);
+    wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC; // technical behaviour
     
     // 2. register window class
     if (!RegisterClass(&wc)) return 100;
     
     // 3. adjust window size (optional)
+    DWORD style = {};
+    style = WS_OVERLAPPEDWINDOW; // window with border & title
+    //style = WS_POPUP; // window without any border or title
     
     // 4. create window instance
     _hWnd = CreateWindow(
         wc.lpszClassName, // class name of window class to be instantiated
         wc.lpszClassName, // window title
-        WS_OVERLAPPEDWINDOW, // visual style
+        style, // visual style
         100, 100, // window position (left-top corner)
         width, height, // window size
         nullptr, // handle to parent window