Merge webxr repository (#35228)

Signed-off-by: Martin Robinson <mrobinson@igalia.com>

components/shared/webxr/frame.rs

@@ -0,0 +1,60 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use crate::Floor;
+use crate::HitTestId;
+use crate::HitTestResult;
+use crate::InputFrame;
+use crate::Native;
+use crate::SubImages;
+use crate::Viewer;
+use crate::Viewports;
+use crate::Views;
+
+use euclid::RigidTransform3D;
+
+/// The per-frame data that is provided by the device.
+/// https://www.w3.org/TR/webxr/#xrframe
+// TODO: other fields?
+#[derive(Clone, Debug)]
+#[cfg_attr(feature = "ipc", derive(serde::Serialize, serde::Deserialize))]
+pub struct Frame {
+    /// The pose information of the viewer
+    pub pose: Option<ViewerPose>,
+    /// Frame information for each connected input source
+    pub inputs: Vec<InputFrame>,
+
+    /// Events that occur with the frame.
+    pub events: Vec<FrameUpdateEvent>,
+
+    /// The subimages to render to
+    pub sub_images: Vec<SubImages>,
+
+    /// 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)]
+#[cfg_attr(feature = "ipc", derive(serde::Serialize, serde::Deserialize))]
+pub enum FrameUpdateEvent {
+    UpdateFloorTransform(Option<RigidTransform3D<f32, Native, Floor>>),
+    UpdateViewports(Viewports),
+    HitTestSourceAdded(HitTestId),
+}
+
+#[derive(Clone, Debug)]
+#[cfg_attr(feature = "ipc", derive(serde::Serialize, serde::Deserialize))]
+pub struct ViewerPose {
+    /// The transform from the viewer to native coordinates
+    ///
+    /// This is equivalent to the pose of the viewer in native coordinates.
+    /// This is the inverse of the view matrix.
+    pub transform: RigidTransform3D<f32, Viewer, Native>,
+
+    // The various views
+    pub views: Views,
+}