f32/d2/rect.go
func RectWH(x, y, w, h float32) Rectangle {
	return Rectangle{
		Min: Vec2{x, y},
		Max: Vec2{x + w, y + h},
	}
}
func RectWH(x, y, w, h float32) Rectangle {
	return Rectangle{
		Min: Vec2{x, y},
		Max: Vec2{x + w, y + h},
	}
}
// RectWH returns a rectangle whose origin is Vec2{x,y}, w and h are its width
// and height.