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Add InputState::stable_dt (#1625)

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This provides a better estimate of a typical frametime in reactive mode.

From the docstring of `stable_dt`:

Time since last frame (in seconds), but gracefully handles the first frame after sleeping in reactive mode.

In reactive mode (available in e.g. `eframe`), `egui` only updates when there is new input or something animating.
This can lead to large gaps of time (sleep), leading to large [`Self::unstable_dt`].

If `egui` requested a repaint the previous frame, then `egui` will use
`stable_dt = unstable_dt;`, but if `egui` did not not request a repaint last frame,
then `egui` will assume `unstable_dt` is too large, and will use
`stable_dt = predicted_dt;`.

This means that for the first frame after a sleep,
`stable_dt` will be a prediction of the delta-time until the next frame,
and in all other situations this will be an accurate measurement of time passed
since the previous frame.

Note that a frame can still stall for various reasons, so `stable_dt` can
still be unusually large in some situations.

When animating something, it is recommended that you use something like
`stable_dt.min(0.1)` - this will give you smooth animations when the framerate is good
(even in reactive mode), but will avoid large jumps when framerate is bad,
and will effectively slow down the animation when FPS drops below 10.
This commit is contained in:
Emil Ernerfeldt
2022-05-12 11:23:53 +02:00
committed by GitHub
parent 931e716b97
commit 2e4138d050
3 changed files with 54 additions and 8 deletions
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5
CHANGELOG.md
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@@ -6,8 +6,9 @@ NOTE: [`epaint`](epaint/CHANGELOG.md), [`eframe`](eframe/CHANGELOG.md), [`egui-w
## Unreleased
### Added ⭐
* Add `*_released` & `*_clicked` methods for `PointerState` ([#1582](https://github.com/emilk/egui/pull/1582)).
* Optimize painting of filled circles (e.g. for scatter plots) by 10x or more ([#1616](https://github.com/emilk/egui/pull/1616)).
* Added `*_released` & `*_clicked` methods for `PointerState` ([#1582](https://github.com/emilk/egui/pull/1582)).
* Optimized painting of filled circles (e.g. for scatter plots) by 10x or more ([#1616](https://github.com/emilk/egui/pull/1616)).
* Added `InputState::stable_dt`: a more stable estimate for the delta-time in reactive mode ([#1625](https://github.com/emilk/egui/pull/1625)).
### Fixed 🐛
* Fixed `ImageButton`'s changing background padding on hover ([#1595](https://github.com/emilk/egui/pull/1595)).