[microtonal]

Nope. The Game Porting Toolkit itself contains a large `D3DMetal` framework that directly translates Direct3D calls into Metal. The Homebrew repo is only part of the toolkit. To actually use it, you have to move the Direct3D -> Metal translation layer into installed Homebrew prefix. From Apple's README:

The graphics bridge libraries need to be placed inside your Wine prefix in order to finalize your game evaluation environment. These instructions assume you have mounted the Game Porting Toolkit at /Volumes/Game Porting Toolkit-1.0. • Copy the Game Porting Toolkit library directory into Wine’s library directory.

    ditto /Volumes/Game\ Porting\ Toolkit-1.0/lib/ `brew --prefix game-porting-toolkit`/lib/

They literally made a new Direct3D implementation on top of Metal.