Allow webvr thread consumers to request input data

components/canvas_traits/webgl.rs

@@ -12,7 +12,7 @@ use std::fmt;
 use std::num::NonZeroU32;
 use std::ops::Deref;
 use webrender_api::{DocumentId, ImageKey, PipelineId};
-use webvr_traits::WebVRFutureFrameData;
+use webvr_traits::WebVRPoseInformation;
 
 /// Helper function that creates a WebGL channel (WebGLSender, WebGLReceiver) to be used in WebGLCommands.
 pub use crate::webgl_channel::webgl_channel;
@@ -508,9 +508,13 @@ pub enum WebVRCommand {
     /// Synchronize the pose information to be used in the frame.
     SyncPoses(
         WebVRDeviceId,
+        // near
         f64,
+        // far
         f64,
-        WebGLSender<Result<WebVRFutureFrameData, ()>>,
+        // sync gamepads too
+        bool,
+        WebGLSender<Result<WebVRPoseInformation, ()>>,
     ),
     /// Submit the frame to a VR device using the specified texture coordinates.
     SubmitFrame(WebVRDeviceId, [f32; 4], [f32; 4]),

components/script/dom/vrdisplay.rs

@@ -51,7 +51,7 @@ use std::mem;
 use std::ops::Deref;
 use std::rc::Rc;
 use std::thread;
-use webvr_traits::{WebVRDisplayData, WebVRDisplayEvent, WebVRFrameData, WebVRFutureFrameData};
+use webvr_traits::{WebVRDisplayData, WebVRDisplayEvent, WebVRFrameData, WebVRPoseInformation};
 use webvr_traits::{WebVRLayer, WebVRMsg};
 
 #[dom_struct]
@@ -86,7 +86,7 @@ pub struct VRDisplay {
     // Compositor VRFrameData synchonization
     frame_data_status: Cell<VRFrameDataStatus>,
     #[ignore_malloc_size_of = "closures are hard"]
-    frame_data_receiver: DomRefCell<Option<WebGLReceiver<Result<WebVRFutureFrameData, ()>>>>,
+    frame_data_receiver: DomRefCell<Option<WebGLReceiver<Result<WebVRPoseInformation, ()>>>>,
     running_display_raf: Cell<bool>,
     paused: Cell<bool>,
     stopped_on_pause: Cell<bool>,
@@ -726,8 +726,13 @@ impl VRDisplay {
                             .unwrap();
 
                         // Run Sync Poses in parallell on Render thread
-                        let msg =
-                            WebVRCommand::SyncPoses(display_id, near, far, sync_sender.clone());
+                        let msg = WebVRCommand::SyncPoses(
+                            display_id,
+                            near,
+                            far,
+                            false,
+                            sync_sender.clone(),
+                        );
                         api_sender.send_vr(msg).unwrap();
                     } else {
                         let _ = wakeup_receiver.recv();
@@ -808,8 +813,8 @@ impl VRDisplay {
     fn sync_frame_data(&self) {
         let status = if let Some(receiver) = self.frame_data_receiver.borrow().as_ref() {
             match receiver.recv().unwrap() {
-                Ok(future_data) => {
-                    *self.frame_data.borrow_mut() = future_data.block();
+                Ok(pose) => {
+                    *self.frame_data.borrow_mut() = pose.frame.block();
                     VRFrameDataStatus::Synced
                 },
                 Err(()) => VRFrameDataStatus::Exit,

components/webvr/webvr_thread.rs

@@ -16,7 +16,7 @@ use std::collections::hash_map::Entry;
 use std::collections::{HashMap, HashSet};
 use std::{thread, time};
 use webvr_traits::webvr::*;
-use webvr_traits::{WebVRMsg, WebVRResult};
+use webvr_traits::{WebVRMsg, WebVRPoseInformation, WebVRResult};
 
 /// WebVRThread owns native VRDisplays, handles their life cycle inside Servo and
 /// acts a doorman for untrusted VR requests from DOM Objects. These are the key components
@@ -386,10 +386,23 @@ impl webgl::WebVRRenderHandler for WebVRCompositorHandler {
                     unsafe { (*compositor.0).start_present(None) };
                 }
             },
-            webgl::WebVRCommand::SyncPoses(compositor_id, near, far, sender) => {
+            webgl::WebVRCommand::SyncPoses(compositor_id, near, far, get_gamepads, sender) => {
                 if let Some(compositor) = self.compositors.get(&compositor_id) {
                     let pose = unsafe { (*compositor.0).future_frame_data(near, far) };
-                    let _ = sender.send(Ok(pose));
+                    let mut pose_information = WebVRPoseInformation {
+                        frame: pose,
+                        gamepads: vec![],
+                    };
+                    if get_gamepads {
+                        let gamepads = unsafe { (*compositor.0).fetch_gamepads() };
+                        if let Ok(gamepads) = gamepads {
+                            for gamepad in gamepads {
+                                let g = gamepad.borrow();
+                                pose_information.gamepads.push((g.id(), g.state()));
+                            }
+                        }
+                    }
+                    let _ = sender.send(Ok(pose_information));
                 } else {
                     let _ = sender.send(Err(()));
                 }

components/webvr_traits/lib.rs

@@ -30,3 +30,9 @@ pub use rust_webvr_api::VRLayer as WebVRLayer;
 pub use rust_webvr_api::VRMainThreadHeartbeat as WebVRMainThreadHeartbeat;
 pub use rust_webvr_api::VRPose as WebVRPose;
 pub use rust_webvr_api::VRStageParameters as WebVRStageParameters;
+
+#[derive(Deserialize, Serialize)]
+pub struct WebVRPoseInformation {
+    pub frame: WebVRFutureFrameData,
+    pub gamepads: Vec<(u32, WebVRGamepadState)>,
+}