func (s *Scene) Draw() {
gg.ClearColor(0.5, 0.5, 0.5, 1.0)
gg.Clear(gg.COLOR_BUFFER_BIT | gg.DEPTH_BUFFER_BIT)
s.triangle.Draw()
}
func (t *Tetris) Draw() {
gg.ClearColor(0.5, 0.5, 0.5, 1.0)
gg.Clear(gg.COLOR_BUFFER_BIT | gg.DEPTH_BUFFER_BIT)
t.bg.Draw()
t.board.Draw()
}