add window message queue

GDP/D3D9/Window.cpp

@@ -1,16 +1,40 @@
 #include "Window.h"
 
+// https://learn.microsoft.com/en-us/windows/win32/learnwin32/creating-a-window
+
 INT Window::init(HINSTANCE hInstance, UINT width, UINT height)
 {
     // 1. describe window class
+    WNDCLASS wc = {};
+    wc.hInstance = hInstance;
+    wc.lpszClassName = TEXT("D3D9"); // class name
+    wc.lpfnWndProc = WindowProc; // callback function for windows to communicate with our application
+    wc.hbrBackground = CreateSolidBrush(RGB(0, 255, 0));
+    wc.hCursor = LoadCursor(nullptr, IDC_ARROW);
+    wc.hIcon = LoadIcon(nullptr, IDI_APPLICATION);
     
     // 2. register window class
+    if (!RegisterClass(&wc)) return 100;
     
     // 3. adjust window size (optional)
     
     // 4. create window instance
+    _hWnd = CreateWindow(
+        wc.lpszClassName, // class name of window class to be instantiated
+        wc.lpszClassName, // window title
+        WS_OVERLAPPEDWINDOW, // visual style
+        100, 100, // window position (left-top corner)
+        width, height, // window size
+        nullptr, // handle to parent window
+        nullptr, // handle to menu instance
+        hInstance,
+        nullptr // pointer to optional parameter
+    );
+    if (_hWnd == nullptr) return 110;
     
     // 5. show window
+    ShowWindow(_hWnd, SW_SHOW);
+    SetFocus(_hWnd);
     
     return 0;
 }
@@ -18,10 +42,41 @@ INT Window::init(HINSTANCE hInstance, UINT width, UINT height)
 BOOL Window::run()
 {
     // 6. run window
+    // GetMessage - syncronous call which holds until a new message arrived
+    // PeekMessage - get last message from message queue or nothing if there is no message
+    // TranslateMessage - translates keyboard input
+    // DispatchMessage - send message to WindowProcedure
+
+    MSG msg = {};
+    if (PeekMessage(&msg, nullptr, 0, UINT_MAX, PM_REMOVE))
+    {
+        TranslateMessage(&msg);
+        DispatchMessage(&msg);
+    }
     
-    return 0;
+    return msg.message != WM_QUIT;
 }
 
 void Window::deInit()
 {
 }
+
+LRESULT WindowProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
+{
+    switch (msg)
+    {
+    case WM_CLOSE:
+        DestroyWindow(hWnd);
+        return 0;
+
+    case WM_DESTROY:
+        PostQuitMessage(0);
+        return 0;
+
+    case WM_KEYDOWN:
+        if (wParam == VK_ESCAPE) DestroyWindow(hWnd);
+        break;
+    }
+
+    return DefWindowProc(hWnd, msg, wParam, lParam);
+}

GDP/D3D9/Window.h

@@ -14,3 +14,4 @@ private:
 	HWND _hWnd = nullptr; // handle to window instance
 };
 
+LRESULT CALLBACK WindowProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);