swift Request GPU in Swift app

[Husky]

I'm trying to develop a Swift menu bar app that switches between the iGPU and the dGPU of a MacBook Pro.

 

I've got the menu bar part right, but can't get the GPU switching working. I tried to have a look at some examples and compare code.

 

I tried to use:

let defaultDevice = MTLCreateSystemDefaultDevice()

but it doesn't seem to do anything.

 

All I want is for the dGPU to activate when I select the dGPU option in the menu, and for it to deactivate when I select the iGPU option. I understand that there is already an app to do this but it is quite old, forces the one GPU or the other (instead of simply requesting it), and I would prefer to do it myself in a leaner package.

 

Any help will be appreciated.