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Fix jittering during window resize on MacOS for WGPU/Metal (#7641)

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Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
This commit is contained in:
ASPCartman
2025-11-01 14:55:56 +03:00
committed by GitHub
parent e861c8ec79
commit c5347f28e4
3 changed files with 88 additions and 10 deletions
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38
crates/eframe/src/native/wgpu_integration.rs
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@@ -71,6 +71,7 @@ pub struct SharedState {
painter: egui_wgpu::winit::Painter,
viewport_from_window: HashMap<WindowId, ViewportId>,
focused_viewport: Option<ViewportId>,
resized_viewport: Option<ViewportId>,
}
pub type Viewports = egui::OrderedViewportIdMap<Viewport>;
@@ -302,6 +303,7 @@ impl<'app> WgpuWinitApp<'app> {
viewports,
painter,
focused_viewport: Some(ViewportId::ROOT),
resized_viewport: None,
}));
{
@@ -763,20 +765,34 @@ impl WgpuWinitRunning<'_> {
let viewport_id = shared.viewport_from_window.get(&window_id).copied();
// On Windows, if a window is resized by the user, it should repaint synchronously, inside the
// event handler.
//
// If this is not done, the compositor will assume that the window does not want to redraw,
// and continue ahead.
// event handler. If this is not done, the compositor will assume that the window does not want
// to redraw and continue ahead.
//
// In eframe's case, that causes the window to rapidly flicker, as it struggles to deliver
// new frames to the compositor in time.
//
// The flickering is technically glutin or glow's fault, but we should be responding properly
// new frames to the compositor in time. The flickering is technically glutin or glow's fault, but we should be responding properly
// to resizes anyway, as doing so avoids dropping frames.
//
// See: https://github.com/emilk/egui/issues/903
let mut repaint_asap = false;
// On MacOS the asap repaint is not enough. The drawn frames must be synchronized with
// the CoreAnimation transactions driving the window resize process.
//
// Thus, Painter, responsible for wgpu surfaces and their resize, has to be notified of the
// resize lifecycle, yet winit does not provide any events for that. To work around,
// the last resized viewport is tracked until any next non-resize event is received.
//
// Accidental state change during the resize process due to an unexpected event fire
// is ok, state will switch back upon next resize event.
//
// See: https://github.com/emilk/egui/issues/903
if let Some(id) = viewport_id
&& shared.resized_viewport == viewport_id
{
shared.painter.on_window_resize_state_change(id, false);
shared.resized_viewport = None;
}
match event {
winit::event::WindowEvent::Focused(focused) => {
let focused = if cfg!(target_os = "macos")
@@ -799,14 +815,18 @@ impl WgpuWinitRunning<'_> {
// Resize with 0 width and height is used by winit to signal a minimize event on Windows.
// See: https://github.com/rust-windowing/winit/issues/208
// This solves an issue where the app would panic when minimizing on Windows.
if let Some(viewport_id) = viewport_id
if let Some(id) = viewport_id
&& let (Some(width), Some(height)) = (
NonZeroU32::new(physical_size.width),
NonZeroU32::new(physical_size.height),
)
{
if shared.resized_viewport != viewport_id {
shared.resized_viewport = viewport_id;
shared.painter.on_window_resize_state_change(id, true);
}
shared.painter.on_window_resized(id, width, height);
repaint_asap = true;
shared.painter.on_window_resized(viewport_id, width, height);
}
}