gio/app/internal/window/os_unix.go

// SPDX-License-Identifier: Unlicense OR MIT

// +build linux,!android freebsd openbsd

package window

import (
	"errors"
)

// windowCounter keeps track of the number of windows.
// A send of +1 or -1 represents a change in window count.
var windowCounter = make(chan int)

func Main() {
	// Wait for first window
	count := <-windowCounter
	for count > 0 {
		count += <-windowCounter
	}
}

// instead of creating files with build tags for each combination of wayland +/- x11
// let each driver initialize these variables with their own version of createWindow.
var wlDriver, x11Driver func(Callbacks, *Options) error

func NewWindow(window Callbacks, opts *Options) error {
	var errFirst, err error
	if wlDriver != nil {
		if err = wlDriver(window, opts); err == nil {
			return nil
		}
		errFirst = err
	}
	if x11Driver != nil {
		if err = x11Driver(window, opts); err == nil {
			return nil
		}
		if errFirst == nil {
			errFirst = err
		}
	}
	if errFirst != nil {
		return errFirst
	}
	return errors.New("app: no window driver available")
}