From a2f4527204f9a9d35b826ad76e9b353194eaa468 Mon Sep 17 00:00:00 2001
From: David Hackbarth <david@lyrebird-studio.com>
Date: Wed, 3 Sep 2025 11:16:24 +0200
Subject: [PATCH] add window

---
 GDP/D3D9/Window.cpp | 88 +++++++++++++++++++++++++++++++++++++--------
 GDP/D3D9/Window.h   |  1 +
 2 files changed, 75 insertions(+), 14 deletions(-)

diff --git a/GDP/D3D9/Window.cpp b/GDP/D3D9/Window.cpp
index 1b684a0..dd38e7c 100644
--- a/GDP/D3D9/Window.cpp
+++ b/GDP/D3D9/Window.cpp
@@ -2,26 +2,86 @@
 
 INT Window::init(HINSTANCE hInstance, UINT width, UINT height)
 {
-    // 1. describe window class
-    
-    // 2. register window class
-    
-    // 3. adjust window size (optional)
-    
-    // 4. create window instance
-    
-    // 5. show window
-    
-    return 0;
+	// 1. describe window class
+	WNDCLASS wc = {};
+	wc.hInstance = hInstance;
+	wc.lpszClassName = TEXT("D3D9"); // class name for identify
+	wc.lpfnWndProc = WindowProc; // function for windows to send messages to our application
+	wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC; // technical window properties, here update window if window change horizontally or vertically and window should have its own device context
+	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 for window instance
+		wc.lpszClassName, // window title
+		WS_OVERLAPPEDWINDOW, // visual window 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;
 }
 
 BOOL Window::run()
 {
-    // 6. run window
-    
-    return 0;
+	// 6. run window
+	// message queue
+	// https://learn.microsoft.com/en-us/windows/win32/winmsg/about-messages-and-message-queues
+	// GetMessage - wait for a message send by windows (syncronous)
+	// PeekMessage - get last message from queue or nothing
+	// TranslateMessage - translates keyboard input (scan (hardware) vs. virtual key code)
+	// DispatchMessage - send message to window proc
+
+	MSG msg;
+	if (PeekMessage(&msg, nullptr, 0, UINT_MAX, PM_REMOVE))
+	{
+		TranslateMessage(&msg);
+		DispatchMessage(&msg);
+	}
+
+	Sleep(10);
+
+	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);
+			return 0;
+		}
+		break;
+	}
+
+	return DefWindowProc(hWnd, msg, wParam, lParam);
+}
diff --git a/GDP/D3D9/Window.h b/GDP/D3D9/Window.h
index 3ef230c..ea76a26 100644
--- a/GDP/D3D9/Window.h
+++ b/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);