BFFramework/BFFramework/Classes/PQGPUImage/Source/Operations/AlphaBlend.swift

public class AlphaBlend: BasicOperation {
    public var mix: Float = 0.5 { didSet { uniformSettings["mixturePercent"] = mix } }

    public init() {
        super.init(fragmentShader: AlphaBlendFragmentShader, numberOfInputs: 2)

        ({ mix = 0.5 })()
    }
}