Initialize a wevxr device registry from Servo

components/canvas_traits/Cargo.toml

@@ -27,3 +27,4 @@ serde_bytes = "0.10"
 servo_config = {path = "../config"}
 webrender_api = {git = "https://github.com/servo/webrender", features = ["ipc"]}
 webvr_traits = {path = "../webvr_traits"}
+webxr-api = "0.0.1"

components/canvas_traits/webgl.rs

@@ -4,6 +4,8 @@
 
 use euclid::{Rect, Size2D};
 use gleam::gl;
+use gleam::gl::GLsync;
+use gleam::gl::GLuint;
 use gleam::gl::Gl;
 use ipc_channel::ipc::{IpcBytesReceiver, IpcBytesSender, IpcSharedMemory};
 use pixels::PixelFormat;
@@ -175,6 +177,23 @@ impl WebGLMsgSender {
     }
 }
 
+impl webxr_api::WebGLExternalImageApi for WebGLMsgSender {
+    fn lock(&self) -> Result<(GLuint, Size2D<i32>, GLsync), webxr_api::Error> {
+        let (sender, receiver) = webgl_channel().or(Err(webxr_api::Error::CommunicationError))?;
+        self.sender
+            .send(WebGLMsg::Lock(self.ctx_id, sender))
+            .or(Err(webxr_api::Error::CommunicationError))?;
+        let (texture, size, sync) = receiver
+            .recv()
+            .or(Err(webxr_api::Error::CommunicationError))?;
+        Ok((texture, size, sync as GLsync))
+    }
+
+    fn unlock(&self) {
+        let _ = self.sender.send(WebGLMsg::Unlock(self.ctx_id));
+    }
+}
+
 #[derive(Deserialize, Serialize)]
 pub struct TruncatedDebug<T>(T);
 

components/compositing/Cargo.toml

@@ -40,6 +40,7 @@ webrender = {git = "https://github.com/servo/webrender", features = ["capture"]}
 webrender_api = {git = "https://github.com/servo/webrender", features = ["ipc"]}
 webvr_traits = {path = "../webvr_traits"}
 webvr = {path = "../webvr"}
+webxr-api = "0.0.1"
 
 [build-dependencies]
 toml = "0.4.5"

components/compositing/windowing.rs

@@ -169,6 +169,9 @@ pub trait EmbedderMethods {
         _: &mut Vec<Box<dyn WebVRMainThreadHeartbeat>>,
     ) {
     }
+
+    /// Register services with a WebXR Registry.
+    fn register_webxr(&mut self, _: &mut webxr_api::Registry) {}
 }
 
 #[derive(Clone, Copy, Debug)]

components/servo/Cargo.toml

@@ -78,6 +78,7 @@ webrender_api = {git = "https://github.com/servo/webrender", features = ["ipc"]}
 webdriver_server = {path = "../webdriver_server", optional = true}
 webvr = {path = "../webvr"}
 webvr_traits = {path = "../webvr_traits"}
+webxr-api = "0.0.1"
 
 [target.'cfg(all(not(target_os = "windows"), not(target_os = "ios"), not(target_os="android"), not(target_arch="arm"), not(target_arch="aarch64")))'.dependencies]
 gaol = {git = "https://github.com/servo/gaol"}

components/servo/lib.rs

@@ -285,6 +285,13 @@ where
         // can't defer it after `create_constellation` has started.
         script::init();
 
+        // For the moment, we enable use both the webxr crate and the rust-webvr crate,
+        // but we are migrating over to just using webxr.
+        let mut webxr_registry = webxr_api::Registry::new();
+        if pref!(dom.webvr.enabled) || pref!(dom.webxr.enabled) {
+            embedder.register_webxr(&mut webxr_registry);
+        }
+
         let mut webvr_heartbeats = Vec::new();
         let webvr_services = if pref!(dom.webvr.enabled) || pref!(dom.webxr.enabled) {
             let mut services = VRServiceManager::new();