Example of how to use a GPUImage Blend Filter in Swift

SwiftGPUImageBlendFiter

let filter = GPUImageOverlayBlendFilter()
filter.useNextFrameForImageCapture()

var picture_1 = GPUImagePicture(image: UIImage(named: "bun-outline.png"))
var picture_2 = GPUImagePicture(image: UIImage(named: "pink.png"))

picture_1.addTarget(filter)
picture_1.processImage()

picture_2.addTarget(filter)
picture_2.processImage()

// Write it to a UIImageView on the interface
bun.image = filter.imageFromCurrentFramebuffer()