Just found extract() .... :)
Seems a lot like the broadcast() one :)
On Saturday, October 15, 2016 at 10:28:53 AM UTC-7, Morten Mikkelsen wrote:
>
> So I have a for-loop along the lines of:
>
> for(int i=programIndex; i<numEntries; i+=programCount)
>
>
> inside this for-loop there's a point where I'd like to update exactly one
> uniform with a value the last lane has access to. So something along the
> lines of:
>
> if(programIndex==(programCount-1))
> {
> piData[0] += totNumValue;
> }
>
> here piData is a uniform int piData[] and totNumValue is varying.
> As you can imagine this does not compile so my question is what is the
> right way to do this with ispc? I guess what I really want is for last
> lane's copy of totNumValue to be written out as a uniform. I looked at the
> broadcast intrinsic but it doesn't seem to return a uniform.
>
>
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