Closes https://github.com/ppy/osu/issues/32420.
The failure cause here is that in editor the beatmap version for the
beatmap affected (or... any beatmap, really), is 0 (ZERO). That is
probably a regression from https://github.com/ppy/osu/pull/32315, but
like... can we universally agree that calling that change "a regression"
in any capacity is dumb? Like what was that code *doing* playing dumb
reference games and copying stuff into an arbitrary instance that could
get or not get used later on? And now you have a 50/50 chance of
accessing the *correct* model's field, depending on whether you go via
`BeatmapInfo` or `Beatmap.BeatmapInfo`?
Moving the field to `IBeatmap`, i.e. what is by now - by consensus,
since https://github.com/ppy/osu/pull/28473 - supposed to be the "decoded
and materialised" beatmap, fixes this issue.
I probably should have done this as part of
https://github.com/ppy/osu/pull/28473 but it slipped my mind. Probably
for the better too because this change has rather large chances of
breaking stuff so maybe better to examine it in isolation (via diffcalc
runs or whatever).
For added humour points, you'd say that the field on `BeatmapInfo` was
not `[Ignore]`d, so this is a realm schema change, right? No. As far as
I can tell, it's not. I opened realm studio and `BeatmapVersion` *is not
a listed column` on `Beatmap` models.
I'm also not gonna get into the fact that I think `EditorBeatmap` doing
dumb games with juggling two `BeatmapInfo` references since
https://github.com/ppy/osu/pull/15075 is bad, because I don't think I
have the mental capacity to hotfix this by going down that train of
thought.
Fixes issue that occurs on *about* 246 beatmaps and was first described
by me on discord:
https://discord.com/channels/188630481301012481/188630652340404224/1154367700378865715
and then rediscovered again during work on
https://github.com/ppy/osu/pull/26405:
https://gist.github.com/bdach/414d5289f65b0399fa8f9732245a4f7c#venenog-on-ultmate-end-by-blacky-overdose-631
It so happens that in stable, due to .NET Framework internals, float
math would be performed using x87 registers and opcodes.
.NET (Core) however uses SSE instructions on 32- and 64-bit words.
x87 registers are _80 bits_ wide. Which is notably wider than _both_
float and double. Therefore, on a significant number of beatmaps,
the rounding would not produce correct values due to insufficient
precision.
See following gist for corroboration of the above:
https://gist.github.com/bdach/dcde58d5a3607b0408faa3aa2b67bf10
Thus, to crudely - but, seemingly accurately, after checking across
all ranked maps - emulate this, use `decimal`, which is slow, but has
bigger precision than `double`. The single known exception beatmap
in whose case this results in an incorrect result is
https://osu.ppy.sh/beatmapsets/1156087#osu/2625853
which is considered an "acceptable casualty" of sorts.
Doing this requires some fooling of the compiler / runtime (see second
inline comment in new method). To corroborate that this is required,
you can try the following code snippet:
Console.WriteLine(string.Join(' ', BitConverter.GetBytes(1.3f).Select(x => x.ToString("X2"))));
Console.WriteLine(string.Join(' ', BitConverter.GetBytes(1.3).Select(x => x.ToString("X2"))));
Console.WriteLine();
decimal d1 = (decimal)1.3f;
decimal d2 = (decimal)1.3;
decimal d3 = (decimal)(double)1.3f;
Console.WriteLine(string.Join(' ', decimal.GetBits(d1).SelectMany(BitConverter.GetBytes).Select(x => x.ToString("X2"))));
Console.WriteLine(string.Join(' ', decimal.GetBits(d2).SelectMany(BitConverter.GetBytes).Select(x => x.ToString("X2"))));
Console.WriteLine(string.Join(' ', decimal.GetBits(d3).SelectMany(BitConverter.GetBytes).Select(x => x.ToString("X2"))));
which will print
66 66 A6 3F
CD CC CC CC CC CC F4 3F
0D 00 00 00 00 00 00 00 00 00 00 00 00 00 01 00
0D 00 00 00 00 00 00 00 00 00 00 00 00 00 01 00
8C 5D 89 FB 3B 76 00 00 00 00 00 00 00 00 0E 00
Note that despite `d1` being converted from a less-precise floating-
-point value than `d2`, it still is represented 100% accurately as
a decimal number.
After applying this change, recomputation of legacy scoring attributes
for *all* rulesets will be required.
Partially addresses https://github.com/ppy/osu/discussions/26416
As pointed out in the discussion thread above, the total score
conversion process for mania was using accuracy directly from the
replay. In mania accuracy is calculated differently in score V1 than in
score V2, which meant that scores coming from stable were treated more
favourably (due to weighting GREAT and PERFECT equally).
To fix, recompute accuracy locally and use that for the accuracy
portion.
Note that this will still not be (and cannot be made) 100% accurate, as
in stable score V2, as well as in lazer, hold notes are *two*
judgements, not one as in stable score V1, meaning that full and correct
score statistics are not available without playing back the replay.
The effects of the change can be previewed on the following spreadsheet:
https://docs.google.com/spreadsheets/d/1wxD4UwLjwcr7n9y5Yq7EN0lgiLBN93kpd4gBnAlG-E0/edit#gid=1711190356
Top 5 changed scores with replays:
| score | master | this PR | replay |
| :------------------------------------------------------------------------------------------------------------------------------- | ------: | ------: | ------: |
| [Outlasted on Uwa!! So Holiday by toby fox [[4K] easy] (0.71\*)](https://osu.ppy.sh/scores/mania/460404716) | 935,917 | 927,269 | 920,579 |
| [ag0 on Emotional Uplifting Orchestral by bradbreeck [[4K] Rocket's Normal] (0.76\*)](https://osu.ppy.sh/scores/mania/453133066) | 921,636 | 913,535 | 875,549 |
| [rlarkgus on Zen Zen Zense by Gom (HoneyWorks) [[5K] Normal] (1.68\*)](https://osu.ppy.sh/scores/mania/458368312) | 934,340 | 926,787 | 918,855 |
| [YuJJun on Harumachi Clover by R3 Music Box [4K Catastrophe] (1.80\*)](https://osu.ppy.sh/scores/mania/548215786) | 918,606 | 911,111 | 885,454 |
| [Fritte on 45-byou by respon feat. Hatsune Miku & Megpoid [[5K] Normal] (1.52\*)](https://osu.ppy.sh/scores/mania/516079410) | 900,024 | 892,569 | 907,456 |
Causes several knock-on inspections in `OsuGame` et al. Probably best
addressed in a separate pass, because treatment is mixed at best (some
places nullcheck, some expect non-null).
As it turns out, on some cultures, the "negative integer" sign is not
encoded using the U+002D HYPHEN-MINUS codepoint. For instance, Swedish
uses U+2212 MINUS SIGN instead. This was confusing the legacy decoder,
since it is correctly depending on the serialisation being
culture-independent.
To fix, ensure that the special "end replay" frame, as well as the
replay MD5 hash, are generated in a culture-invariant manner.
Thankfully the replay MD5 hash is currently being discarded in
`LegacyScoreDecoder`, so it changing in future scores should not have
any negative effect on lazer operation.