What is the preferred method to load a texture in Metal?

Question

I am trying to load an asset image in Metal like so:

let textureLoader = MTKTextureLoader(device: context.device)
do{
    let image = UIImage(named: name)
    try texture = textureLoader.newTextureWithCGImage(image!.CGImage!, options: [:])
}catch let error{
    print("Failed to create texture, error \(error)")
}

I am able to display the image but the colors are permuted, as if the file contains RGB data but it is being interpreted as BGR data. I know the default color space for a Metal layer is BGRA8Unorm but I don't know how to force the image to be loaded in that format.

Answer 1

You should use the designated class method on MTKTextureLoader to create a new MTLTexture from an URL:

let device = MTLCreateSystemDefaultDevice()!
let loader = MTKTextureLoader(device: device)
let url = NSBundle.mainBundle().URLForResource("pic", withExtension: "jpg")!
let texture = try! loader.newTextureWithContentsOfURL(url, options: nil)