On 21 May 2012 22:01, Olivier Galibert <galib...@pobox.com> wrote: > On Mon, May 21, 2012 at 07:16:35PM -0700, Paul Berry wrote: > > - Add the front-end API to allow the client to request per-sample shading > > (I assume it's glEnable(GL_HAM_SANDWICH) or something like that, in which > > case it should be easy) > > There is a "MIN_SAMPLE_SHADING" value in the [0,1] interval which is > set by glMinSampleShading(clampf value). It tells the minimum ratio > of samples that must be individually shaded. For instance, if you're > doing 4xMSAA and mss=0.75, then you must shade at least 3 samples. >
Thanks, Olivier, that's exactly the information I was looking for. > > Always shading all of them as soon as mss is non-zero is compliant to > the spec. Ok, cool. I think we can improve on this slightly by doing persample dispatch when mss >= 1/N (where N=number of samples per pixel). Of course in practice it's hard to see why anyone would set 0 < mss <= 1/N on purpose :) > Always shading all of them all the time is actually > compliant to the spec, as far as I can say, but would be a bad idea. > > OG. >
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