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fix(runtime): the wheel on macOS did nothing, or everything

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scrollingDeltaY is a double and the Cocoa event pump truncated it to an int per EVENT
before accumulating. A trackpad or a Magic Mouse sends a stream of fractions of a line,
every one of which truncated to zero, so the wheel was dead; a notched mouse sends three
to ten lines at once, so it jumped. The fraction is accumulated now, a precise delta is
scaled from points to notches, and the remainder carries to the next frame.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-20 01:24:37 +03:00
parent 18d23ca20d
commit f7f47152bd
2 changed files with 189 additions and 6 deletions
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7
changes/leaves-light-and-the-bole.md
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@ -30,3 +30,10 @@ night lit your boots and nothing else. `daylight_hand` takes a `reach` in metres
the falloff is a gentle power out to it — about nine tenths at a metre, half at half the
reach, a tenth at nine tenths of it, nothing past it. A pool of light with a gradient in
it rather than a hotspot with a cliff.
**And the wheel on macOS did nothing, or everything.** `scrollingDeltaY` is a double, and
the Cocoa event pump truncated it to an int PER EVENT before accumulating: a trackpad or a
Magic Mouse sends a stream of fractions of a line, every one of which truncated to zero, so
the wheel was dead; a notched mouse sends three to ten lines at once, so it jumped. The
fraction is accumulated now, a precise delta is scaled from points to notches, and the
remainder carries to the next frame - one gesture, one step, on both kinds of mouse.