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Krock |
nerzhul: what kind of "updates on the server" do you mean? |
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| 21:36 |
Krock |
nerzhul: new toy #7569 |
| 21:36 |
ShadowBot |
https://github.com/minetest/minetest/issues/7569 -- Send custom floats (log2) by SmallJoker |
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| 21:54 |
p_gimeno |
sorry for the dumb question, but what's wrong with just using F32? |
| 21:54 |
p_gimeno |
I mean, actual single-precision floats |
| 21:54 |
Krock |
as in memcpy? |
| 21:56 |
p_gimeno |
yes, or union integer and hton/ntoh |
| 21:56 |
Krock |
the memory representation is not defined, so it would be required to disassemble each feature of the float |
| 21:56 |
Krock |
and the bitop everything together again so that it's ensured to be the correct format |
| 21:56 |
Krock |
see also: https://github.com/minetest/minetest/pull/6312 |
| 21:59 |
Krock |
I cannot test whether all by Minetest supported architectures also will work with this idea - missing computers, time and motivation to get the stuff together |
| 22:00 |
p_gimeno |
you don't need floats to work the same in all architectures in order to transmit them through a network, and while the C++ standard does not specify floats to be IEEE-754 compliant, you can add a configure check and either refuse to compile, or have fallback code for IEEE conversion |
| 22:01 |
p_gimeno |
I'm pretty sure there must be simple functions with a usable license that convert float to IEEE and vice versa |
| 22:04 |
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| 22:04 |
p_gimeno |
it seems you did a good job getting close to that, already |
| 22:06 |
Krock |
thanks. However, it's not perfect. Special numbers (nan/inf/-inf) and those close to the maximal float value aren't handled correctly |
| 22:09 |
p_gimeno |
special cases are trivial to handle: if (isnan(f)) return 0x7FC00000; if (isinf(f)) return 0x7F800000 | (f < 0) << 31; |
| 22:11 |
p_gimeno |
well, the other way around has the danger that the implementation aborts on division by zero instead of returning NaN/Inf, but I doubt that's a problem |
| 22:12 |
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| 22:12 |
p_gimeno |
that's assuming you want to transmit these values through the network in the first place |
| 22:13 |
Krock |
yes. at least have the regular values correctly and as precise as possible transmit |
| 22:14 |
Krock |
will check logs |
| 22:17 |
p_gimeno |
a configure check (or even runtime) seems pretty trivial: https://stackoverflow.com/questions/5777484/how-to-check-if-c-compiler-uses-ieee-754-floating-point-standard |
| 22:34 |
p_gimeno |
here's one such IEEE conversion project: https://github.com/MalcolmMcLean/ieee754 |
| 22:35 |
p_gimeno |
unfortunately that one doesn't specify a license, guess you could bug the author in an issue to see if he would add one |
| 22:45 |
nerzhul |
Krock interesting PR |
| 22:51 |
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