You have a choice in some games for the majority of games you dont
I do think both vendors should have tryed to add effects like the gameworks concept (not saying locked for either or that i agree with all of gameworks idea's) and better IQ rather then leaving all of that mostly to DX, Yes tress hair is great and thats another example of what i feel the venders themselves were quite capable of doing
Competition in the API market is good if its for everyone but i can see why mantle is restricted to newer GCN cards as to make it for more would reduce its effectiveness to most likely to worse or equal the difference you find on your cards betweeen DX and mantle and therefore pointless
3 So far and many more to come, it will be 4 in a week. 6 or more next month.
In terms of the Game Works concept of adding features, it doesn't need to be a GW concept, 3D Shadows, Dynamic Global illumination, TressFX... and Nvidia PhysX, Hair Works, HBAO+... all existed before GW.
But there is no reason why Mantle can't be an API and a features plug-in environment, it will probably evolve into that, but it will have to be something that the wider development community approves of, as Mantle currently does, no reason to wreck that.
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