example-runner-wgpu: replace custom PortableInstant with web-time crate

Author: Firestar99

Cargo.lock

@@ -26,6 +26,7 @@ winit = { version = "0.30.0", features = ["android-native-activity", "rwh_05"] }
 clap = { version = "4", features = ["derive"] }
 strum = { version = "0.27.2", default-features = false, features = ["std", "derive"] }
 bytemuck = "1.6.3"
+web-time = "1.1.0"
 
 [target.'cfg(not(any(target_os = "android", target_arch = "wasm32")))'.dependencies]
 env_logger = "0.11.0"
@@ -37,7 +38,7 @@ android_logger = "0.15.1"
 # to avoid specifying the dependency twice, but only applies to android builds.
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
-web-sys = { version = "0.3.78", features = ["Performance"] }
+web-sys = "0.3.78"
 console_error_panic_hook = "0.1.7"
 console_log = "1.0.0"
 wasm-bindgen-futures = "0.4.51"

examples/runners/wgpu/Cargo.toml

@@ -24,53 +24,6 @@ mod shaders {
     include!(concat!(env!("OUT_DIR"), "/entry_points.rs"));
 }
 
-/// Abstraction for getting timestamps even when `std::time` isn't supported.
-enum PortableInstant {
-    #[cfg(not(target_arch = "wasm32"))]
-    Native(std::time::Instant),
-
-    #[cfg(target_arch = "wasm32")]
-    Web {
-        performance_timestamp_ms: f64,
-
-        // HACK(eddyb) cached `window().performance()` to speed up/simplify `elapsed`.
-        cached_window_performance: web_sys::Performance,
-    },
-}
-
-impl PortableInstant {
-    fn now() -> Self {
-        #[cfg(not(target_arch = "wasm32"))]
-        {
-            Self::Native(std::time::Instant::now())
-        }
-        #[cfg(target_arch = "wasm32")]
-        {
-            let performance = web_sys::window()
-                .expect("missing window")
-                .performance()
-                .expect("missing window.performance");
-            Self::Web {
-                performance_timestamp_ms: performance.now(),
-                cached_window_performance: performance,
-            }
-        }
-    }
-
-    fn elapsed_secs_f32(&self) -> f32 {
-        match self {
-            #[cfg(not(target_arch = "wasm32"))]
-            Self::Native(instant) => instant.elapsed().as_secs_f32(),
-
-            #[cfg(target_arch = "wasm32")]
-            Self::Web {
-                performance_timestamp_ms,
-                cached_window_performance,
-            } => ((cached_window_performance.now() - performance_timestamp_ms) / 1000.0) as f32,
-        }
-    }
-}
-
 fn mouse_button_index(button: MouseButton) -> usize {
     match button {
         MouseButton::Left => 0,
@@ -243,7 +196,7 @@ async fn run(
         compiled_shader_modules,
     );
 
-    let start = PortableInstant::now();
+    let start = web_time::Instant::now();
 
     let (mut cursor_x, mut cursor_y) = (0.0, 0.0);
     let (mut drag_start_x, mut drag_start_y) = (0.0, 0.0);
@@ -363,7 +316,7 @@ async fn run(
                             ..Default::default()
                         });
 
-                        let time = start.elapsed_secs_f32();
+                        let time = start.elapsed().as_secs_f32();
                         for (i, press_time) in mouse_button_press_time.iter_mut().enumerate() {
                             if (mouse_button_press_since_last_frame & (1 << i)) != 0 {
                                 *press_time = time;