3 ms·

I second "just try all of them" when testing single precision floats. It's really easy to do, and gives you a lot of confidence in the correctness. For example,

I second "just try all of them" when testing single precision floats. It's really easy to do, and gives you a lot of confidence in the correctness. For example, I had a float-to-bytes-to-floats conversion in some GPU shaders and "just test that every single possible float survives a round trip" made it trivial to be sure it was correct. (Also I found out my video card drivers were losing an ulp when parsing float constants in shaders.)

pedrocr 5y ago
Roundtrip tests are great when you don't have a gold standard. It allows for at least consistency across operations. I've done a bunch and found quite a few corner cases. I also did a few roundtrip tests in RGB spaces where being exhaustive was no longer feasible. For those I ended up iterating over the whole RGB space but skipping values in each component by different prime values, to try and cover as many of the possible weird cases as possible: https://github.com/pedrocr/imagepipe/blob/12269f04ac2fa0d165fc860d853ca828a8b8de3e/src/color_conversions.rs#L337-L610 https://github.com/pedrocr/imagepipe/blob/12269f04ac2fa0d165...