[Bf-cycles] extending Cycles to use all devices "CPU + CUDA"

[Mohamed Sakr]

sorry for recreating with the same name "previous mail got deleted".

I got a good idea Sergey which may solve most of the problem:
consider you have many devices "CPU + some GPUs, even if you have a crazy
system with both NVidia and AMD together (not sure if it is a possible case
thought :)"

now you have many samples to do, consider 100 samples.
each task got a sample counter "0-99" , this will be extended a little!, a
buffer which will have sample count "spp".

this buffer will get accessed by each task at the start of the sampling
"before generating camera rays" , as the same RNG is generated (probably
depending mainly on sample number/pixel x,y position) , this will work!

so a CPU may render its own samples "full image" , rendering for example 15
spp
and a GPU will render its own samples "full image" , in that case 85 spp.

utilizing both CPU and GPU, each one will be consistent.
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