func initOpenGl(window *glfw.Window, w, h int) {
w, h = window.GetSize() // query window to get screen pixels
width, height := window.GetFramebufferSize()
gl.Viewport(0, 0, width, height)
gl.MatrixMode(gl.PROJECTION)
gl.LoadIdentity()
gl.Ortho(0, float64(w), 0, float64(h), -1, 1)
gl.MatrixMode(gl.MODELVIEW)
gl.LoadIdentity()
gl.ClearColor(.25, .88, .83, 1) // turquoise
}
// renders the display on each update
func render() {
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.Enable(gl.BLEND)
gl.Enable(gl.POINT_SMOOTH)
gl.Enable(gl.LINE_SMOOTH)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.LoadIdentity()
// draw pipes
for _, pipeBox := range pipe {
gl.PushMatrix()
pos := pipeBox.Body.Position()
gl.Translatef(float32(pos.X), float32(pos.Y), 0.0)
drawSquare(.19, .8, .19, 1) // limegreen
gl.PopMatrix()
}
// draw flappy
for _, flappyBird := range flappyBirds {
gl.PushMatrix()
pos := flappyBird.Body.Position()
gl.Translatef(float32(pos.X), float32(pos.Y), 0.0)
drawSquare(1, .84, 0, 1) // gold
gl.PopMatrix()
}
gl.Color4f(1, 0, 1, 1)
scoreStr := "[ Score: " + strconv.Itoa(score) + " ]"
// draw score
drawScore(scoreStr)
}