On Thu, Jan 12, 2017 at 4:03 PM, Matteo Bruni <matteo.myst...@gmail.com> wrote: > So, what would be really nice to have is a GLSL extension for some > kind of switch to select the requested behavior WRT NaN. For example a > three-way option with "don't generate NaN in arithmetic operations", > "do generate NaN" and "don't care". It could also be a GL state if > that's easier to implement with the existing hardware, since an > individual application isn't supposed to require different behavior > from one shader to the next. > > Is anyone interested in / favorable to something like this? It would > solve the issue with defining NaN behavior in GLSL while making things > a bit more compatible with "other API a lot of games are ported from > which happens to be supported by all the desktop GPUs".
Not that I'm biased, but on the NVIDIA Tesla series (G80-GT21x), this enable is handled via a global flag, not in the shader binary, so this is all-or-nothing for a whole pipeline. On GF100+, I believe there is also an enable via a global flag, but there are also a FMUL.FMZ (and FFMA.FMZ) flag, which I *think* has the same effect. So for GF100+ hw, this could be done at the instruction level. Cheers, -ilia _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
