Why doesn't the square "render"?

Question

go

My code just opens a window. And I also expect a square.

func init() {
  runtime.LockOSThread()
}

func main() {
  if err := glfw.Init(); err != nil {
    log.Fatal(err)
  }
  defer glfw.Terminate()

  window, err := glfw.CreateWindow(640, 480, "Testing", nil, nil)
  if err != nil {
    log.Fatal(err)
  }

  window.MakeContextCurrent()
  if err := gl.Init(); err != nil {
    log.Fatal(err)
  }

  for !window.ShouldClose() {
    // Do OpenGL stuff.
    window.SwapBuffers()
    glfw.PollEvents()
    //делаем квадрат
    gl.Clear(gl.COLOR_BUFFER_BIT)
    gl.Begin(gl.QUADS)

    gl.Color3f(1.0, 1.0, 1.0)
    gl.Vertex2i(250, 450)
    gl.Color3f(0.0, 0.0, 1.0)
    gl.Vertex2i(250, 150)
    gl.Color3f(0.0, 1.0, 0.0)
    gl.Vertex2i(550, 150)
    gl.Color3f(1.0, 0.0, 0.0)
    gl.Vertex2i(550, 450)
    gl.End()

  }

}

What did you do wrong?

Answer 1

I don't see setting world, view and projection matrices. Campaign it is really rendered, but the camera just does not look there. Plus, you need to explicitly specify a color for clearing the screen, to be sure.