script/dom/webxr/
xrsystem.rs

1/* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
4
5use std::cell::Cell;
6use std::rc::Rc;
7
8use base::id::PipelineId;
9use dom_struct::dom_struct;
10use ipc_channel::ipc::{self as ipc_crate, IpcReceiver};
11use ipc_channel::router::ROUTER;
12use profile_traits::generic_callback::GenericCallback as ProfileGenericCallback;
13use profile_traits::ipc;
14use servo_config::pref;
15use webxr_api::{Error as XRError, Frame, Session, SessionInit, SessionMode};
16
17use crate::conversions::Convert;
18use crate::dom::bindings::cell::DomRefCell;
19use crate::dom::bindings::codegen::Bindings::XRSystemBinding::{
20    XRSessionInit, XRSessionMode, XRSystemMethods,
21};
22use crate::dom::bindings::conversions::{ConversionResult, SafeFromJSValConvertible};
23use crate::dom::bindings::error::Error;
24use crate::dom::bindings::inheritance::Castable;
25use crate::dom::bindings::refcounted::{Trusted, TrustedPromise};
26use crate::dom::bindings::reflector::{DomGlobal, reflect_dom_object};
27use crate::dom::bindings::root::{Dom, DomRoot, MutNullableDom};
28use crate::dom::bindings::trace::RootedTraceableBox;
29use crate::dom::eventtarget::EventTarget;
30use crate::dom::gamepad::Gamepad;
31use crate::dom::globalscope::GlobalScope;
32use crate::dom::promise::Promise;
33use crate::dom::window::Window;
34use crate::dom::xrsession::XRSession;
35use crate::dom::xrtest::XRTest;
36use crate::realms::InRealm;
37use crate::script_runtime::CanGc;
38use crate::script_thread::ScriptThread;
39
40#[dom_struct]
41pub(crate) struct XRSystem {
42    eventtarget: EventTarget,
43    gamepads: DomRefCell<Vec<Dom<Gamepad>>>,
44    pending_immersive_session: Cell<bool>,
45    active_immersive_session: MutNullableDom<XRSession>,
46    active_inline_sessions: DomRefCell<Vec<Dom<XRSession>>>,
47    test: MutNullableDom<XRTest>,
48    #[no_trace]
49    pipeline: PipelineId,
50}
51
52impl XRSystem {
53    fn new_inherited(pipeline: PipelineId) -> XRSystem {
54        XRSystem {
55            eventtarget: EventTarget::new_inherited(),
56            gamepads: DomRefCell::new(Vec::new()),
57            pending_immersive_session: Cell::new(false),
58            active_immersive_session: Default::default(),
59            active_inline_sessions: DomRefCell::new(Vec::new()),
60            test: Default::default(),
61            pipeline,
62        }
63    }
64
65    pub(crate) fn new(window: &Window, can_gc: CanGc) -> DomRoot<XRSystem> {
66        reflect_dom_object(
67            Box::new(XRSystem::new_inherited(window.pipeline_id())),
68            window,
69            can_gc,
70        )
71    }
72
73    pub(crate) fn pending_or_active_session(&self) -> bool {
74        self.pending_immersive_session.get() || self.active_immersive_session.get().is_some()
75    }
76
77    pub(crate) fn set_pending(&self) {
78        self.pending_immersive_session.set(true)
79    }
80
81    pub(crate) fn set_active_immersive_session(&self, session: &XRSession) {
82        // XXXManishearth when we support non-immersive (inline) sessions we should
83        // ensure they never reach these codepaths
84        self.pending_immersive_session.set(false);
85        self.active_immersive_session.set(Some(session))
86    }
87
88    /// <https://immersive-web.github.io/webxr/#ref-for-eventdef-xrsession-end>
89    pub(crate) fn end_session(&self, session: &XRSession) {
90        // Step 3
91        if let Some(active) = self.active_immersive_session.get() {
92            if Dom::from_ref(&*active) == Dom::from_ref(session) {
93                self.active_immersive_session.set(None);
94                // Dirty the canvas, since it has been skipping this step whilst in immersive
95                // mode
96                session.dirty_layers();
97            }
98        }
99        self.active_inline_sessions
100            .borrow_mut()
101            .retain(|sess| Dom::from_ref(&**sess) != Dom::from_ref(session));
102    }
103}
104
105impl Convert<SessionMode> for XRSessionMode {
106    fn convert(self) -> SessionMode {
107        match self {
108            XRSessionMode::Immersive_vr => SessionMode::ImmersiveVR,
109            XRSessionMode::Immersive_ar => SessionMode::ImmersiveAR,
110            XRSessionMode::Inline => SessionMode::Inline,
111        }
112    }
113}
114
115impl XRSystemMethods<crate::DomTypeHolder> for XRSystem {
116    /// <https://immersive-web.github.io/webxr/#dom-xr-issessionsupported>
117    fn IsSessionSupported(&self, mode: XRSessionMode, can_gc: CanGc) -> Rc<Promise> {
118        // XXXManishearth this should select an XR device first
119        let promise = Promise::new(&self.global(), can_gc);
120        let mut trusted = Some(TrustedPromise::new(promise.clone()));
121        let global = self.global();
122        let task_source = global
123            .task_manager()
124            .dom_manipulation_task_source()
125            .to_sendable();
126
127        let callback =
128            ProfileGenericCallback::new(global.time_profiler_chan().clone(), move |message| {
129                // router doesn't know this is only called once
130                let trusted = if let Some(trusted) = trusted.take() {
131                    trusted
132                } else {
133                    error!("supportsSession callback called twice!");
134                    return;
135                };
136                let message: Result<(), webxr_api::Error> = if let Ok(message) = message {
137                    message
138                } else {
139                    error!("supportsSession callback given incorrect payload");
140                    return;
141                };
142                if let Ok(()) = message {
143                    task_source.queue(trusted.resolve_task(true));
144                } else {
145                    task_source.queue(trusted.resolve_task(false));
146                };
147            })
148            .expect("Could not create callback");
149
150        if let Some(mut r) = global.as_window().webxr_registry() {
151            r.supports_session(mode.convert(), callback);
152        }
153
154        promise
155    }
156
157    /// <https://immersive-web.github.io/webxr/#dom-xr-requestsession>
158    fn RequestSession(
159        &self,
160        mode: XRSessionMode,
161        init: RootedTraceableBox<XRSessionInit>,
162        comp: InRealm,
163        can_gc: CanGc,
164    ) -> Rc<Promise> {
165        let global = self.global();
166        let window = global.as_window();
167        let promise = Promise::new_in_current_realm(comp, can_gc);
168
169        if mode != XRSessionMode::Inline {
170            if !ScriptThread::is_user_interacting() {
171                if pref!(dom_webxr_unsafe_assume_user_intent) {
172                    warn!(
173                        "The dom.webxr.unsafe-assume-user-intent preference assumes user intent to enter WebXR."
174                    );
175                } else {
176                    promise.reject_error(Error::Security(None), can_gc);
177                    return promise;
178                }
179            }
180
181            if self.pending_or_active_session() {
182                promise.reject_error(Error::InvalidState(None), can_gc);
183                return promise;
184            }
185
186            self.set_pending();
187        }
188
189        let mut required_features = vec![];
190        let mut optional_features = vec![];
191        let cx = GlobalScope::get_cx();
192
193        if let Some(ref r) = init.requiredFeatures {
194            for feature in r {
195                if let Ok(ConversionResult::Success(s)) =
196                    String::safe_from_jsval(cx, feature.handle(), (), can_gc)
197                {
198                    required_features.push(s)
199                } else {
200                    warn!("Unable to convert required feature to string");
201                    if mode != XRSessionMode::Inline {
202                        self.pending_immersive_session.set(false);
203                    }
204                    promise.reject_error(Error::NotSupported(None), can_gc);
205                    return promise;
206                }
207            }
208        }
209
210        if let Some(ref o) = init.optionalFeatures {
211            for feature in o {
212                if let Ok(ConversionResult::Success(s)) =
213                    String::safe_from_jsval(cx, feature.handle(), (), can_gc)
214                {
215                    optional_features.push(s)
216                } else {
217                    warn!("Unable to convert optional feature to string");
218                }
219            }
220        }
221
222        if !required_features.contains(&"viewer".to_string()) {
223            required_features.push("viewer".to_string());
224        }
225
226        if !required_features.contains(&"local".to_string()) && mode != XRSessionMode::Inline {
227            required_features.push("local".to_string());
228        }
229
230        let init = SessionInit {
231            required_features,
232            optional_features,
233            first_person_observer_view: pref!(dom_webxr_first_person_observer_view),
234        };
235
236        let mut trusted = Some(TrustedPromise::new(promise.clone()));
237        let this = Trusted::new(self);
238        let task_source = global
239            .task_manager()
240            .dom_manipulation_task_source()
241            .to_sendable();
242        let (sender, receiver) = ipc::channel(global.time_profiler_chan().clone()).unwrap();
243        let (frame_sender, frame_receiver) = ipc_crate::channel().unwrap();
244        let mut frame_receiver = Some(frame_receiver);
245        ROUTER.add_typed_route(
246            receiver.to_ipc_receiver(),
247            Box::new(move |message| {
248                // router doesn't know this is only called once
249                let trusted = trusted.take().unwrap();
250                let this = this.clone();
251                let frame_receiver = frame_receiver.take().unwrap();
252                let message: Result<Session, webxr_api::Error> = if let Ok(message) = message {
253                    message
254                } else {
255                    error!("requestSession callback given incorrect payload");
256                    return;
257                };
258                task_source.queue(task!(request_session: move || {
259                    this.root().session_obtained(message, trusted.root(), mode, frame_receiver, CanGc::note());
260                }));
261            }),
262        );
263        if let Some(mut r) = window.webxr_registry() {
264            r.request_session(mode.convert(), init, sender, frame_sender);
265        }
266        promise
267    }
268
269    /// <https://github.com/immersive-web/webxr-test-api/blob/master/explainer.md>
270    fn Test(&self) -> DomRoot<XRTest> {
271        self.test
272            .or_init(|| XRTest::new(&self.global(), CanGc::note()))
273    }
274}
275
276impl XRSystem {
277    fn session_obtained(
278        &self,
279        response: Result<Session, XRError>,
280        promise: Rc<Promise>,
281        mode: XRSessionMode,
282        frame_receiver: IpcReceiver<Frame>,
283        can_gc: CanGc,
284    ) {
285        let session = match response {
286            Ok(session) => session,
287            Err(e) => {
288                warn!("Error requesting XR session: {:?}", e);
289                if mode != XRSessionMode::Inline {
290                    self.pending_immersive_session.set(false);
291                }
292                promise.reject_error(Error::NotSupported(None), can_gc);
293                return;
294            },
295        };
296        let session = XRSession::new(
297            self.global().as_window(),
298            session,
299            mode,
300            frame_receiver,
301            CanGc::note(),
302        );
303        if mode == XRSessionMode::Inline {
304            self.active_inline_sessions
305                .borrow_mut()
306                .push(Dom::from_ref(&*session));
307        } else {
308            self.set_active_immersive_session(&session);
309        }
310        promise.resolve_native(&session, can_gc);
311        // https://github.com/immersive-web/webxr/issues/961
312        // This must be called _after_ the promise is resolved
313        session.setup_initial_inputs();
314    }
315
316    // https://github.com/immersive-web/navigation/issues/10
317    pub(crate) fn dispatch_sessionavailable(&self) {
318        let xr = Trusted::new(self);
319        self.global()
320            .task_manager()
321            .dom_manipulation_task_source()
322            .queue(
323                task!(fire_sessionavailable_event: move || {
324                    // The sessionavailable event indicates user intent to enter an XR session
325                    let xr = xr.root();
326                        let _guard = ScriptThread::user_interacting_guard();
327                        xr.upcast::<EventTarget>().fire_bubbling_event(atom!("sessionavailable"), CanGc::note());
328                })
329            );
330    }
331}
script/dom/webxr/xrsystem.rs

script/dom/webxr/
xrsystem.rs
