public class EmbossFilter: Convolution3x3 {
    public var intensity: Float = 1.0 {
        didSet {
            self.convolutionKernel = Matrix3x3(rowMajorValues: [
                intensity * (-2.0), -intensity, 0.0,
                -intensity, 1.0, intensity,
                0.0, intensity, intensity * 2.0,
            ])
        }
    }

    override public init() {
        super.init()

        ({ intensity = 1.0 })()
    }
}
