- Fixes#16823
CLOCK_UPTIME_RAW is mach_absolute_time() in nanoseconds (the same value, not
just the same rate). That's the clock MoltenVK reports VK_GOOGLE_display_timing
present times in, which time_now_raw() is meant to match. Apple's
CLOCK_MONOTONIC counts time asleep, unlike Linux's, so on a Mac that had
slept since boot, from_time_raw() of a present time was off by all of it.
It's also cheaper to read: ~19ns vs ~30ns on M1. mach_absolute_time() itself
is ~8ns, but returns ticks, and the timebase on Apple Silicon is 125/3.
Timing risk: time_now_d() no longer advances while the machine sleeps, so a
sleep/wake shows up as a small delta rather than a huge one.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
