AMD said in their Capsaicin presentation that in near future, two or more GPU's will become more and more common and mainstream.. maybe Apple will share their idea? That's why I was thinking that they have to help and motivate developers in this matter. I didn't find any tools for this from MetalKit.
Ehhhhhhhhhhhh.
Remember Apple's target markets are all low form factor. It's hard to see the iMac or the Macbook Pro getting multiple GPUs. Multiple GPUs are the basis of the nMP, but it's not a large enough target for anyone to bother optimizing for.
The only way AMD might pull it off is if they start putting multiple integrated GPUs on their CPU cores. But without that, multiple GPUs are probably still going to be limited to high end rigs. The only other out might be game consoles?
Biggest issue with multiple GPUs on the Mac is no technology exists on any platform to give you multiple GPUs without any effort as a developer, and there just aren't enough Mac Pro gamers out there to make it worth any sort of effort. DX12 and Crossfire/SLI both require some work to be done by the developer, but there are enough multi GPU gamers on Windows to make it worth it.
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So that's a reflection of what people on Stackoverflow are using to code, not coder in general.
That's ok. Even if devs are using the Mac to write for Android, it still counts. The Mac Pro does have some popularity among developers, and more developers can help to increase sales. I just haven't seen any evidence Apple cares about specific use cases like VR strongly.