From f98cacdde33eb5c7093191f3aadcaefd807fc23b Mon Sep 17 00:00:00 2001
From: David Hackbarth <david@lyrebird-studio.com>
Date: Wed, 3 Sep 2025 16:10:19 +0200
Subject: [PATCH] add window (WIP)

---
 GDP/D3D9/Window.cpp | 29 ++++++++++++++++++++++++++++-
 GDP/D3D9/Window.h   |  1 +
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/GDP/D3D9/Window.cpp b/GDP/D3D9/Window.cpp
index 1b684a0..8819944 100644
--- a/GDP/D3D9/Window.cpp
+++ b/GDP/D3D9/Window.cpp
@@ -1,16 +1,38 @@
 #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));
     
     // 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;
 }
@@ -19,9 +41,14 @@ BOOL Window::run()
 {
     // 6. run window
     
-    return 0;
+    return true;
 }
 
 void Window::deInit()
 {
 }
+
+LRESULT WindowProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
+{
+    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);