With CUDA, you'd actually have hit the problem that the Proto functions are not marked __device__, but with OpenCL it doesn't matter.
Mathias, Could you say more about what is needed to make Proto CUDA-friendly? I'm not familiar with CUDA.
The thing needed to make Proto more CUDA-friendly is the same thing that is needed to make it AMP-friendly, in case you are familiar with C++ AMP [1]. Basically, you have to intrusively annotate every Proto function with the "__host__ __device__" annotation (restrict(x86, amp) in the case of C++ AMP). [1] http://msdn.microsoft.com/en-us/library/hh265137.aspx
-- Eric Niebler BoostPro Computing http://www.boostpro.com
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