> A lot of our options do change how shaders work though, like forcing a shader to use double precision floats instead of the single it was compiled with.
What benefit would that give? Is double precision faster than single on modern hardware?
What benefit would that give? Is double precision faster than single on modern hardware?
This is all kind of on the assumption that the accuracy of floating point multiplication and division is in the IEEE spec, I was told before that it was but searching now I can't seem to find it one way or the other.
I believe one of the optimizations done by nvidia is to drop f32 variables down to f16 in a shader. Which would technically break the accuracy requirement (as before if it exists). I don't have anything I can offer as proof of that due to NDA sadly though. I will note that most of my testing and work is done in PIX for Windows, and most don't have anti-cheat so they're easy to capture.
FWIW, I’ve never heard of shader replacement to force doubles. It’d be interesting to hear when that’s been used and why, and surprising to me if it was ever done for a popular game.