gistfile1.txt

package main

import (
    "fmt"
    glfw "github.com/go-gl/glfw3"
)

func errorCallback(err glfw.ErrorCode, desc string) {
    fmt.Printf("%v: %v\n", err, desc)
}

func onCloseA(wnd *glfw.Window) {
    fmt.Println("closed A")
}
func onCloseB(wnd *glfw.Window) {
    fmt.Println("closed B")
}

func main() {
    glfw.SetErrorCallback(errorCallback)

    if !glfw.Init() {
        panic("Can't init glfw!")
    }
    defer glfw.Terminate()

    window, err := glfw.CreateWindow(640, 480, "Testing A", nil, nil)
    if err != nil {
        panic(err)
    }
    windowB, err := glfw.CreateWindow(640, 480, "Testing B", nil, nil)
    if err != nil {
        panic(err)
    }
    window.SetCloseCallback(onCloseA)
    windowB.SetCloseCallback(onCloseB)

    window.MakeContextCurrent()

    for !window.ShouldClose() || !windowB.ShouldClose() {
        //Do OpenGL stuff
        window.SwapBuffers()
        glfw.PollEvents()
    }
}