First Go Program with OpenGL (3.3)

package main

import ("fmt"
        "runtime"
        "github.com/go-gl/glfw/v3.2/glfw"
        "github.com/go-gl/gl/v3.3-core/gl")

const  (windowWidth = 960
        windowHeight = 540)

func main() {
    fmt.Printf("launching\n")

    runtime.LockOSThread()

    if err := glfw.Init(); err != nil {
        panic(fmt.Errorf("could not initialize glfw: %v", err))
    }

    fmt.Printf("glfw initialized\n")

    glfw.WindowHint(glfw.ContextVersionMajor, 3)
    glfw.WindowHint(glfw.ContextVersionMinor, 3)
    glfw.WindowHint(glfw.Resizable, glfw.True)
    glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
    glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)

    fmt.Printf("glfw hints defined\n")

    win, err := glfw.CreateWindow(windowWidth, windowHeight, "Hello World!", nil, nil)

    if err != nil {
        panic(fmt.Errorf("could not create glfw window: %v", err))
    }

    fmt.Printf("glfw window created\n")

    win.MakeContextCurrent()

    if err := gl.Init(); err != nil {
        panic(fmt.Errorf("opengl init error: %v", err))
    }

    fmt.Printf("opengl context created\n")

    gl.ClearColor(0.0, 0.5, 1.0, 1.0)

    fmt.Printf("launched\n")

    for !win.ShouldClose() {
        gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
        win.SwapBuffers()
        glfw.PollEvents()
    }

    fmt.Printf("closing\n")
}