With the release of 10.13.4, Apple mentions "Pro applications and 3D games that accelerate the built-in display of an iMac or MacBook Pro. (This capability must be enabled by the application's developer.)". I was not able to find any developer documentation about this. How exactly can this be "enabled"? Do they mean drawing on the external GPU and then "manually" copying the buffer to the iGPU?
eGPU acceleration on internal display
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