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Make VR presentation code async; use for VRDisplay::RequestPresent

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This commit is contained in:
Manish Goregaokar 2019-01-07 16:55:52 -08:00
parent 90e87b97ba
commit 9ddbf68cb3
1 changed files with 58 additions and 31 deletions
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89
components/script/dom/vrdisplay.rs
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@ -15,7 +15,7 @@ use crate::dom::bindings::codegen::Bindings::WindowBinding::WindowMethods;
use crate::dom::bindings::codegen::Bindings::XRSessionBinding::XRFrameRequestCallback;
use crate::dom::bindings::inheritance::Castable;
use crate::dom::bindings::num::Finite;
use crate::dom::bindings::refcounted::Trusted;
use crate::dom::bindings::refcounted::{Trusted, TrustedPromise};
use crate::dom::bindings::reflector::{reflect_dom_object, DomObject};
use crate::dom::bindings::root::{DomRoot, MutDom, MutNullableDom};
use crate::dom::bindings::str::DOMString;
@ -34,7 +34,7 @@ use crate::dom::xrframe::XRFrame;
use crate::dom::xrsession::XRSession;
use crate::script_runtime::CommonScriptMsg;
use crate::script_runtime::ScriptThreadEventCategory::WebVREvent;
use crate::task_source::TaskSourceName;
use crate::task_source::{TaskSource, TaskSourceName};
use canvas_traits::webgl::{webgl_channel, WebGLReceiver, WebVRCommand};
use crossbeam_channel::{unbounded, Sender};
use dom_struct::dom_struct;
@ -347,35 +347,8 @@ impl VRDisplayMethods for VRDisplay {
},
};
// WebVR spec: Repeat calls while already presenting will update the VRLayers being displayed.
if self.presenting.get() {
*self.layer.borrow_mut() = layer_bounds;
self.layer_ctx.set(Some(&layer_ctx));
promise.resolve_native(&());
return promise;
}
// Request Present
let (sender, receiver) = ipc::channel(self.global().time_profiler_chan().clone()).unwrap();
self.webvr_thread()
.send(WebVRMsg::RequestPresent(
self.global().pipeline_id(),
self.display.borrow().display_id,
sender,
))
.unwrap();
match receiver.recv().unwrap() {
Ok(()) => {
*self.layer.borrow_mut() = layer_bounds;
self.layer_ctx.set(Some(&layer_ctx));
self.init_present();
promise.resolve_native(&());
},
Err(e) => {
promise.reject_native(&e);
},
}
self.request_present(layer_bounds, Some(&layer_ctx),
promise.clone(), |p| p.resolve_native(&()));
promise
}
@ -464,6 +437,60 @@ impl VRDisplay {
}
}
pub fn request_present<F>(&self, layer_bounds: WebVRLayer,
ctx: Option<&WebGLRenderingContext>,
promise: Rc<Promise>, resolve: F)
where F: FnOnce(Rc<Promise>) + Send + 'static {
// WebVR spec: Repeat calls while already presenting will update the VRLayers being displayed.
if self.presenting.get() {
*self.layer.borrow_mut() = layer_bounds;
self.layer_ctx.set(ctx);
resolve(promise);
return;
}
// Request Present
let (sender, receiver) = ipc::channel(self.global().time_profiler_chan().clone()).unwrap();
self.webvr_thread()
.send(WebVRMsg::RequestPresent(
self.global().pipeline_id(),
self.display.borrow().display_id,
sender,
))
.unwrap();
let promise = TrustedPromise::new(promise);
let this = Trusted::new(self);
let ctx = ctx.map(|c| Trusted::new(c));
let global = self.global();
let window = global.as_window();
let (task_source, canceller) = window
.task_manager()
.dom_manipulation_task_source_with_canceller();
thread::spawn(move || {
let recv = receiver.recv().unwrap();
let _ = task_source.queue_with_canceller(
task!(vr_presenting: move || {
let this = this.root();
let promise = promise.root();
let ctx = ctx.map(|c| c.root());
match recv {
Ok(()) => {
*this.layer.borrow_mut() = layer_bounds;
this.layer_ctx.set(ctx.as_ref().map(|c| &**c));
this.init_present();
resolve(promise);
},
Err(e) => {
promise.reject_native(&e);
},
}
}),
&canceller,
);
});
}
pub fn handle_webvr_event(&self, event: &WebVRDisplayEvent) {
match *event {
WebVRDisplayEvent::Connect(ref display) => {