fix: fix clock timing on web. closes #234

tetanes/src/nes/emulation.rs

@@ -853,7 +853,8 @@ impl State {
             }
             thread::park_timeout(self.target_frame_duration - park_epsilon);
             return;
-        } else if !self.rewinding && self.should_park() {
+        }
+        if !self.rewinding && self.should_park() {
             thread::park_timeout(self.audio.queued_time().saturating_sub(self.audio.latency));
             return;
         }

tetanes/src/nes/event.rs

@@ -28,7 +28,7 @@ use tetanes_core::{
 use tracing::{error, trace};
 use winit::{
     event::{ElementState, Event, WindowEvent},
-    event_loop::{ControlFlow, EventLoopProxy, EventLoopWindowTarget},
+    event_loop::{ControlFlow, DeviceEvents, EventLoopProxy, EventLoopWindowTarget},
     keyboard::PhysicalKey,
     window::WindowId,
 };
@@ -224,6 +224,9 @@ impl Nes {
                     event_loop.exit();
                     return;
                 }
+                // Disable device events to save some cpu as they're mostly duplicated in
+                // WindowEvents
+                event_loop.listen_device_events(DeviceEvents::Never);
                 if let State::Running(state) = &mut self.state {
                     if let Some(window) = state
                         .renderer
@@ -322,6 +325,18 @@ impl Running {
                 }
 
                 self.emulation.clock_frame();
+
+                // Event loop timing isn't great on web, so try to clock as fast as possible by
+                // requesting a redraw every time which will wake up the event loop, and then
+                // trigger AboutToWait again.
+                #[cfg(target_arch = "wasm32")]
+                if let Some(window) = self
+                    .renderer
+                    .root_window_id()
+                    .and_then(|window_id| self.renderer.window(window_id))
+                {
+                    window.request_redraw();
+                }
             }
             Event::WindowEvent {
                 window_id, event, ..