Surface predicted display time on Frame object (#240)

Signed-off-by: Daniel Adams <msub2official@gmail.com>
servo · Aug 18, 2024 · 474d538 · 474d538
1 parent 08a6d70
commit 474d538
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diff --git a/webxr-api/frame.rs b/webxr-api/frame.rs
@@ -33,6 +33,9 @@ pub struct Frame {
 
     /// The hit test results for this frame, if any
     pub hit_test_results: Vec<HitTestResult>,
+
+    /// The average point in time this XRFrame is expected to be displayed on the devices' display
+    pub predicted_display_time: f64,
 }
 
 #[derive(Clone, Debug)]

diff --git a/webxr/glwindow/mod.rs b/webxr/glwindow/mod.rs
@@ -192,6 +192,7 @@ impl DeviceAPI for GlWindowDevice {
             events: vec![],
             sub_images,
             hit_test_results: vec![],
+            predicted_display_time: 0.0,
         })
     }
 

diff --git a/webxr/headless/mod.rs b/webxr/headless/mod.rs
@@ -362,6 +362,7 @@ impl HeadlessDeviceData {
             events: vec![],
             sub_images,
             hit_test_results: vec![],
+            predicted_display_time: 0.0,
         }
     }
 

diff --git a/webxr/openxr/mod.rs b/webxr/openxr/mod.rs
@@ -1469,6 +1469,7 @@ impl DeviceAPI for OpenXrDevice {
             events: vec![],
             sub_images,
             hit_test_results: vec![],
+            predicted_display_time: frame_state.predicted_display_time.as_nanos() as f64,
         };
 
         if let Some(right_select) = right.select {