f32/d2/vec2.go
func (v Vec2) Normalize() {
	d := 1.0 / math32.Sqrt(v[0]*v[0]+v[1]*v[1])
	v[0] *= d
	v[1] *= d
}
func (v Vec2) Normalize() {
	d := 1.0 / math32.Sqrt(v[0]*v[0]+v[1]*v[1])
	v[0] *= d
	v[1] *= d
}
// Normalize normalizes the vector.