I'm unaware of Mantle and Metal, but DirectX is direct too.
It's not really a massive issue when you're locally installing programs since you've already compromised your system in the first place. But when leveraged over the web with APIs such as WebGL, it does become a security vulnerability.
It's not really a massive issue when you're locally installing programs since you've already compromised your system in the first place. But when leveraged over the web with APIs such as WebGL, it does become a security vulnerability.