Use `instant` crate in egui-winit for WebAssembly support (#1023)

* Replace `std::time::Instant` with wasm-compatible `instant::Instant`

* Change version requirement for instant to be compatible to winit

* Enable wasm-bindgen feature for instant

* Update lockfile

* Update changelog

* sort dependencies

Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>

Cargo.lock

@@ -806,6 +806,7 @@ dependencies = [
  "copypasta",
  "egui",
  "epi",
+ "instant",
  "serde",
  "tts",
  "webbrowser",

egui-winit/CHANGELOG.md

@@ -4,6 +4,7 @@ All notable changes to the `egui-winit` integration will be noted in this file.
 
 
 ## Unreleased
+* Replaced `std::time::Instant` with `instant::Instant` for WebAssembly compatability ([#1023](https://github.com/emilk/egui/pull/1023))
 
 
 ## 0.16.0 - 2021-12-29

egui-winit/Cargo.toml

@@ -23,6 +23,7 @@ all-features = true
 
 [dependencies]
 egui = { version = "0.16.0", path = "../egui", default-features = false, features = ["single_threaded"] }
+instant = { version = "0.1", features = ["wasm-bindgen"] }
 winit = "0.26"
 
 epi = { version = "0.16.0", path = "../epi", optional = true }

egui-winit/src/epi.rs

@@ -95,7 +95,7 @@ pub fn handle_app_output(
 /// For loading/saving app state and/or egui memory to disk.
 pub struct Persistence {
     storage: Option<Box<dyn epi::Storage>>,
-    last_auto_save: std::time::Instant,
+    last_auto_save: instant::Instant,
 }
 
 #[allow(clippy::unused_self)]
@@ -116,7 +116,7 @@ impl Persistence {
 
         Self {
             storage: create_storage(app_name),
-            last_auto_save: std::time::Instant::now(),
+            last_auto_save: instant::Instant::now(),
         }
     }
 
@@ -177,7 +177,7 @@ impl Persistence {
         egui_ctx: &egui::Context,
         window: &winit::window::Window,
     ) {
-        let now = std::time::Instant::now();
+        let now = instant::Instant::now();
         if now - self.last_auto_save > app.auto_save_interval() {
             self.save(app, egui_ctx, window);
             self.last_auto_save = now;
@@ -278,7 +278,7 @@ impl EpiIntegration {
         epi::backend::TexAllocationData,
         Vec<egui::epaint::ClippedShape>,
     ) {
-        let frame_start = std::time::Instant::now();
+        let frame_start = instant::Instant::now();
 
         let raw_input = self.egui_winit.take_egui_input(window);
         let (egui_output, shapes) = self.egui_ctx.run(raw_input, |egui_ctx| {
@@ -294,7 +294,7 @@ impl EpiIntegration {
         let tex_allocation_data =
             crate::epi::handle_app_output(window, self.egui_ctx.pixels_per_point(), app_output);
 
-        let frame_time = (std::time::Instant::now() - frame_start).as_secs_f64() as f32;
+        let frame_time = (instant::Instant::now() - frame_start).as_secs_f64() as f32;
         self.frame.lock().info.cpu_usage = Some(frame_time);
 
         (needs_repaint, tex_allocation_data, shapes)

egui-winit/src/lib.rs

@@ -105,7 +105,7 @@ pub fn screen_size_in_pixels(window: &winit::window::Window) -> egui::Vec2 {
 
 /// Handles the integration between egui and winit.
 pub struct State {
-    start_time: std::time::Instant,
+    start_time: instant::Instant,
     egui_input: egui::RawInput,
     pointer_pos_in_points: Option<egui::Pos2>,
     any_pointer_button_down: bool,
@@ -137,7 +137,7 @@ impl State {
     /// Initialize with a given dpi scaling.
     pub fn from_pixels_per_point(pixels_per_point: f32) -> Self {
         Self {
-            start_time: std::time::Instant::now(),
+            start_time: instant::Instant::now(),
             egui_input: egui::RawInput {
                 pixels_per_point: Some(pixels_per_point),
                 ..Default::default()