I've been trying to build an App to understand Metal on Mac better. It's a universal App that runs on Mac and iOS and renders around 4.2 million particles on screen. It works perfectly fine on my iPhone 6+ and on an rMBP with iris 5100 but for some reason it freaks out on my cMP with MSI R9 280X, it just flickers and doesn't show the animation. I know Metal is supported on this GPU so I don't really have any idea what the problem is. Is there any documentation on feature sets ?