Originally posted by Drago
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So what you want to do is have the data go from the CPU to the GPU and never back.
So if what you're doing needs CPU fallback, it might be faster to do the entire pipe, for as long as possible, on the CPU, untill what you wanted to do has been done by the CPU and then send the rest of the pipeline to the GPU.
Now imagine you 'just' have to do a single thing on the CPU, like floating point, but floating point calculations are all the way from the geometry to the post processing effects, then you either need to do the entire pipe in the CPU, or send everything back and forth a billion times before comming to a single frame on the GPU's framebuffer...
In other words a single patent makes it impossible...
PS: I don't even know what we were talking about anymore now :P
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