Implement Reading as a skill in osu!taiko

[Lawtrohux]

Introduces the Reading Skill and EffectiveBPM for osu!taiko. The main takeaway is high SV (Slider Velocity) gives a bonus based on a per-object effectiveBPM. This does also mean HR now gives an SR Bonus, however its fixed difficulty pp multiplier has been removed to offset these changes. Similarly, the convert pp nerf has been slightly shifted alongside the addition of reading.

Low SV does not contain considerations within this build. This is primarily due to continued discussions about its impact on pp vs its impact on sr when it comes to mods like hidden and flashlight.

• Uses a sigmoid function to calculate the influence of high SV on difficulty. The function’s centre is around a predefined effective BPM range,
• Incorporates a calculation for object density based on DeltaTime. this currently is only utilised as an attribute but provides a data value for future HD and FL considerations.
• LoadEffectiveBPM: Retrieves the current slider velocity from scroll_speed by object. My access methods may be a little messy, however.

Changes are viewable at Huismetbenen

Should #30536 get merged DifficultyCalculationUtils can be used instead for the sigmoid.

[smoogipoo]

!diffcalc
RULESET=taiko

[github-actions]

Target: #30538
Spreadsheet: https://docs.google.com/spreadsheets/d/1qrPynx_KEBf4ilBJpWSL8wE9z-cPmEL3R67FKoR3Y0s/edit

[Lawtrohux]

@smoogipoo is it possible to get a converts excluded and a converts only smoogisheet? Also ranked only if preferable, gimmick loved maps seemingly are problematic.

Thank you in advance.

[smoogipoo]

I can't really do converts only right now, but I can do converts excluded.

!diffcalc
RULESET=taiko
NO_CONVERTS=1

[github-actions]

Difficulty calculation failed: https://github.com/ppy/osu/actions/runs/11791562075

[github-actions]

Target: #30538
Spreadsheet: https://docs.google.com/spreadsheets/d/1CEBSMMcMHakIF85iP4xhUWRHsMOYFxJ8QkmznEelZlI/edit

[sw1tchbl4d3r]

@smoogipoo can we get another sheet for this?

[smoogipoo]

!diffcalc
RULESET=taiko

[smoogipoo]

!diffcalc
RULESET=taiko
NO_CONVERTS=1

[github-actions]

Difficulty calculation failed: https://github.com/ppy/osu/actions/runs/11987626602

[github-actions]

Target: #30538
Spreadsheet: https://docs.google.com/spreadsheets/d/1Q9gBak9TejncJG0pL1KhrIdhkBUg8CELef_JqAQDXU8/edit

[github-actions]

Target: #30538
Spreadsheet: https://docs.google.com/spreadsheets/d/1TcYfl4wRU7lO-NsAP6S7ctoTjhqJFo4FfTeWk39CMLg/edit

[Lawtrohux]

I'm closing with in favour of (probably) grouping this pr together with the upcoming rhythm rework, as done with the previous rework. However code stays as is, values lgtm.