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// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: 2024 The Ebitengine Authors
package main
import (
"runtime"
"syscall"
"unsafe"
"github.com/ebitengine/purego"
)
const (
WS_OVERLAPPEDWINDOW = 0x00000000 | 0x00C00000 | 0x00080000 | 0x00040000 | 0x00020000 | 0x00010000
CW_USEDEFAULT = ^0x7fffffff
SW_SHOW = 5
WM_DESTROY = 2
)
type (
ATOM uint16
HANDLE uintptr
HINSTANCE HANDLE
HICON HANDLE
HCURSOR HANDLE
HBRUSH HANDLE
HWND HANDLE
HMENU HANDLE
)
type WNDCLASSEX struct {
Size uint32
Style uint32
WndProc uintptr
ClsExtra int32
WndExtra int32
Instance HINSTANCE
Icon HICON
Cursor HCURSOR
Background HBRUSH
MenuName *uint16
ClassName *uint16
IconSm HICON
}
type RECT struct {
Left, Top, Right, Bottom int32
}
type POINT struct {
X, Y int32
}
type MSG struct {
Hwnd HWND
Message uint32
WParam uintptr
LParam uintptr
Time uint32
Pt POINT
}
var (
GetModuleHandle func(modulename *uint16) HINSTANCE
RegisterClassEx func(w *WNDCLASSEX) ATOM
CreateWindowEx func(exStyle uint, className, windowName *uint16,
style uint, x, y, width, height int, parent HWND, menu HMENU,
instance HINSTANCE, param unsafe.Pointer) HWND
AdjustWindowRect func(rect *RECT, style uint, menu bool) bool
ShowWindow func(hwnd HWND, cmdshow int) bool
GetMessage func(msg *MSG, hwnd HWND, msgFilterMin, msgFilterMax uint32) int
TranslateMessage func(msg *MSG) bool
DispatchMessage func(msg *MSG) uintptr
DefWindowProc func(hwnd HWND, msg uint32, wParam, lParam uintptr) uintptr
PostQuitMessage func(exitCode int)
)
func init() {
// Use [syscall.NewLazyDLL] here to avoid external dependencies (#270).
// For actual use cases, [golang.org/x/sys/windows.NewLazySystemDLL] is recommended.
kernel32 := syscall.NewLazyDLL("kernel32.dll").Handle()
purego.RegisterLibFunc(&GetModuleHandle, kernel32, "GetModuleHandleW")
// Use [syscall.NewLazyDLL] here to avoid external dependencies (#270).
// For actual use cases, [golang.org/x/sys/windows.NewLazySystemDLL] is recommended.
user32 := syscall.NewLazyDLL("user32.dll").Handle()
purego.RegisterLibFunc(&RegisterClassEx, user32, "RegisterClassExW")
purego.RegisterLibFunc(&CreateWindowEx, user32, "CreateWindowExW")
purego.RegisterLibFunc(&AdjustWindowRect, user32, "AdjustWindowRect")
purego.RegisterLibFunc(&ShowWindow, user32, "ShowWindow")
purego.RegisterLibFunc(&GetMessage, user32, "GetMessageW")
purego.RegisterLibFunc(&TranslateMessage, user32, "TranslateMessage")
purego.RegisterLibFunc(&DispatchMessage, user32, "DispatchMessageW")
purego.RegisterLibFunc(&DefWindowProc, user32, "DefWindowProcW")
purego.RegisterLibFunc(&PostQuitMessage, user32, "PostQuitMessage")
runtime.LockOSThread()
}
func main() {
className, err := syscall.UTF16PtrFromString("Sample Window Class")
if err != nil {
panic(err)
}
inst := GetModuleHandle(className)
wc := WNDCLASSEX{
Size: uint32(unsafe.Sizeof(WNDCLASSEX{})),
WndProc: syscall.NewCallback(wndProc),
Instance: inst,
ClassName: className,
}
RegisterClassEx(&wc)
wr := RECT{
Left: 0,
Top: 0,
Right: 320,
Bottom: 240,
}
title, err := syscall.UTF16PtrFromString("My Title")
if err != nil {
panic(err)
}
AdjustWindowRect(&wr, WS_OVERLAPPEDWINDOW, false)
hwnd := CreateWindowEx(
0, className,
title,
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, int(wr.Right-wr.Left), int(wr.Bottom-wr.Top),
0, 0, inst, nil,
)
if hwnd == 0 {
panic(syscall.GetLastError())
}
ShowWindow(hwnd, SW_SHOW)
var msg MSG
for GetMessage(&msg, 0, 0, 0) != 0 {
TranslateMessage(&msg)
DispatchMessage(&msg)
}
}
func wndProc(hwnd HWND, msg uint32, wparam, lparam uintptr) uintptr {
switch msg {
case WM_DESTROY:
PostQuitMessage(0)
}
return DefWindowProc(hwnd, msg, wparam, lparam)
}
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