Merge pull request #1073 from mechpanos/pr/edit-latency-metric

src/scene/mod.rs

@@ -1432,6 +1432,10 @@ pub(crate) enum NavPerfOp {
     Pan,
     Zoom,
     Rotate,
+    /// A message that changed geometry. Reported through the same line as
+    /// navigation because the question is the same one: how long from the
+    /// input to the frame that answers it.
+    Edit,
 }
 
 impl NavPerfOp {
@@ -1440,6 +1444,7 @@ impl NavPerfOp {
             Self::Pan => "pan",
             Self::Zoom => "zoom",
             Self::Rotate => "rotate",
+            Self::Edit => "edit",
         }
     }
 }
@@ -1447,6 +1452,10 @@ impl NavPerfOp {
 #[derive(Clone, Copy, Debug)]
 pub(in crate::scene) struct NavPerfSample {
     pub(in crate::scene) op: NavPerfOp,
+    /// Which message caused it. An edit whose handler runs in under a
+    /// millisecond never reaches the `update` line's threshold, so without this
+    /// the log shows the latency but not what asked for it.
+    pub(in crate::scene) cause: &'static str,
     pub(in crate::scene) space: &'static str,
     pub(in crate::scene) mode: &'static str,
     pub(in crate::scene) started: iced::time::Instant,
@@ -2875,6 +2884,15 @@ impl Scene {
     }
 
     pub(crate) fn record_nav_perf(&self, op: NavPerfOp, started: iced::time::Instant) {
+        self.record_nav_perf_caused(op, "-", started);
+    }
+
+    pub(crate) fn record_nav_perf_caused(
+        &self,
+        op: NavPerfOp,
+        cause: &'static str,
+        started: iced::time::Instant,
+    ) {
         if !crate::perf::enabled() {
             return;
         }
@@ -2887,6 +2905,7 @@ impl Scene {
         };
         self.nav_perf_pending.set(Some(NavPerfSample {
             op,
+            cause,
             space,
             mode,
             started,

src/scene/view/render.rs

@@ -1216,8 +1216,9 @@ impl shader::Primitive for Primitive {
         let prepare_ms = nav_prepare_started.elapsed().as_secs_f64() * 1000.0;
         if let Some(sample) = self.nav_perf {
             crate::perf::record(format_args!(
-                "[perf] nav-prepare op={} space={} mode={} input={:.2}ms build={:.2}ms prepare={:.2}ms elapsed={:.2}ms viewports={}",
+                "[perf] nav-prepare op={} cause={} space={} mode={} input={:.2}ms build={:.2}ms prepare={:.2}ms elapsed={:.2}ms viewports={}",
                 sample.op.label(),
+                sample.cause,
                 sample.space,
                 sample.mode,
                 sample.input_ms,