Metal MTLTexture replaces semi-transparent areas with black when alpha values that aren't 1 or 0 – Photoshop

While using Apple’s texture importer, or my own, a white soft-edged circle drawn in software (with a transparent bg) or in Photoshop (saved as a PNG) when rendered will have its semi-transparent colors replaced with black when brought into Metal.

Below is a screen grab from Xcode’s Metal debugger, you can see the texture before being sent to shaders.

Image located here (I’m not high ranked enough to embed)

In Xcode, finder, and when put into an UIImageView, the source texture does not have the ring. But somewhere along the UIImage -> CGContex -> MTLTexture process (I’m thinking specifically the MTLTexture part) the tranparent sections are darkened.

I’ve been banging my head against the wall changing everything I could for the past couple of days but I can’t figure it out.

To be transparent (ha), here is my personal import code

import UIKit
import CoreGraphics

class MetalTexture {

    class func imageToTexture(imageNamed: String, device: MTLDevice) -> MTLTexture {
        let bytesPerPixel = 4
        let bitsPerComponent = 8

        var image = UIImage(named: imageNamed)!

        let width = Int(image.size.width)
        let height = Int(image.size.height)
        let bounds = CGRectMake(0, 0, CGFloat(width), CGFloat(height))

        var rowBytes = width * bytesPerPixel
        var colorSpace = CGColorSpaceCreateDeviceRGB()

        let context = CGBitmapContextCreate(nil, width, height, bitsPerComponent, rowBytes, colorSpace, CGBitmapInfo(CGImageAlphaInfo.PremultipliedLast.rawValue))

        CGContextClearRect(context, bounds)
        CGContextTranslateCTM(context, CGFloat(width), CGFloat(height))
        CGContextScaleCTM(context, -1.0, -1.0)
        CGContextDrawImage(context, bounds, image.CGImage)

        var texDescriptor = MTLTextureDescriptor.texture2DDescriptorWithPixelFormat(.RGBA8Unorm, width: width, height: height, mipmapped: false)

        var texture = device.newTextureWithDescriptor(texDescriptor)
        texture.label = imageNamed

        var pixelsData = CGBitmapContextGetData(context)

        var region = MTLRegionMake2D(0, 0, width, height)
        texture.replaceRegion(region, mipmapLevel: 0, withBytes: pixelsData, bytesPerRow: rowBytes)

        return texture
    }
}

But I don’t think that’s the problem (since it’s a copy of Apple’s in Swift, and I’ve used theirs instead with no differences).

Any leads at all would be super helpful.