diff -r 59ea5791be5e -r 4d86050ad6ff ui/win32/window.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/win32/window.c	Tue May 06 15:24:39 2025 +0200
@@ -0,0 +1,99 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2024 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "window.h"
+#include "Windows.h"
+
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+
+static HINSTANCE hInstance;
+
+static const wchar_t *mainWindowClass = L"UiMainWindow";
+
+LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
+    switch(uMsg) {
+        case WM_DESTROY:
+            PostQuitMessage(0);
+            break;
+        default:
+            return DefWindowProc(hwnd, uMsg, wParam, lParam);
+    }
+    return 0;
+}
+
+void ui_window_init(void) {
+	hInstance = GetModuleHandle(NULL);
+	
+	WNDCLASSEX wc = { sizeof(WNDCLASSEX) };
+    wc.lpfnWndProc = WindowProc;
+    wc.hInstance = hInstance;
+    wc.lpszClassName = mainWindowClass;
+    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
+    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
+
+    if(!RegisterClassEx(&wc)) {
+        MessageBox(NULL, "RegisterClassEx failed", "Error", MB_ICONERROR);
+        exit(-1);
+    }
+}
+
+static UiObject* create_window(const char *title, void *window_data, bool simple) {
+	CxMempool *mp = cxMempoolCreateSimple(256);
+    const CxAllocator *a = mp->allocator;
+    UiObject *obj = cxCalloc(a, 1, sizeof(UiObject));
+    obj->ctx = uic_context(obj, mp);
+    obj->window = window_data;
+	
+	HWND hwnd = CreateWindowEx(
+			0,
+			L"UiMainWindow",
+			"Test",
+			WS_OVERLAPPEDWINDOW | WS_VISIBLE,
+            CW_USEDEFAULT,
+			CW_USEDEFAULT,
+			800,
+			600,
+            NULL,
+			NULL,
+			hInstance,
+			NULL);
+	
+	ShowWindow(hwnd, SW_SHOWNORMAL);
+    UpdateWindow(hwnd);
+	
+	return obj;
+}
+
+UiObject *ui_window(const char *title, void *window_data) {
+	return create_window(title, window_data, FALSE);
+}
+