On 04/14/2014 06:59 PM, Chris Forbes wrote: > Are the streamout values allowed to be restricted to the ranges of the > vertex header fields, or do they have to reflect exactly what the > shader wrote? > > (I ran into a similar issue with ARB_fragment_layer_viewport, and > while nothing has been done about it, the consensus was that the FS > had to see exactly what the previous stage wrote, and so a real slot > would be necessary)
I'm not sure. It sounds like there aren't any conformance tests for that behavior, or else Anuj would have come across them. It always seemed like a stupid behavior to me, which is just wasteful for no benefit (if you want to output arbitrary values, define your own varying, seriously). Personally, I would have landed your ARB_fragment_layer_viewport patches. At any rate, Anuj's patches make in-range values actually work, instead of nothing working at all, so I think we should take them regardless. If we absolutely have to support out-of-range values being copied unmodified, then we can revisit this. --Ken
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