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/* 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::dom::bindings::codegen::Bindings::XRViewBinding;
use crate::dom::bindings::codegen::Bindings::XRViewBinding::{XREye, XRViewMethods};
use crate::dom::bindings::reflector::{reflect_dom_object, Reflector};
use crate::dom::bindings::root::{Dom, DomRoot};
use crate::dom::globalscope::GlobalScope;
use crate::dom::vrframedata::create_typed_array;
use crate::dom::xrrigidtransform::XRRigidTransform;
use crate::dom::xrsession::{cast_transform, ApiViewerPose, XRSession};
use dom_struct::dom_struct;
use js::jsapi::{Heap, JSContext, JSObject};
use std::ptr::NonNull;
use webxr_api::View;
#[dom_struct]
pub struct XRView {
reflector_: Reflector,
session: Dom<XRSession>,
eye: XREye,
#[ignore_malloc_size_of = "mozjs"]
proj: Heap<*mut JSObject>,
#[ignore_malloc_size_of = "mozjs"]
view: Heap<*mut JSObject>,
transform: Dom<XRRigidTransform>,
}
impl XRView {
fn new_inherited(session: &XRSession, transform: &XRRigidTransform, eye: XREye) -> XRView {
XRView {
reflector_: Reflector::new(),
session: Dom::from_ref(session),
eye,
proj: Heap::default(),
view: Heap::default(),
transform: Dom::from_ref(transform),
}
}
#[allow(unsafe_code)]
pub fn new<V: Copy>(
global: &GlobalScope,
session: &XRSession,
view: &View<V>,
eye: XREye,
pose: &ApiViewerPose,
) -> DomRoot<XRView> {
// XXXManishearth compute and cache projection matrices on the Display
// this transform is the pose of the viewer in the eye space, i.e. it is the transform
// from the viewer space to the eye space. We invert it to get the pose of the eye in the viewer space.
let offset = view.transform.inverse();
let transform = pose.pre_transform(&offset);
let transform = XRRigidTransform::new(global, cast_transform(transform));
let ret = reflect_dom_object(
Box::new(XRView::new_inherited(session, &transform, eye)),
global,
XRViewBinding::Wrap,
);
// row_major since euclid uses row vectors
let proj = view.projection.to_row_major_array();
let cx = global.get_cx();
unsafe {
create_typed_array(cx, &proj, &ret.proj);
}
ret
}
pub fn session(&self) -> &XRSession {
&self.session
}
}
impl XRViewMethods for XRView {
/// https://immersive-web.github.io/webxr/#dom-xrview-eye
fn Eye(&self) -> XREye {
self.eye
}
#[allow(unsafe_code)]
/// https://immersive-web.github.io/webxr/#dom-xrview-projectionmatrix
unsafe fn ProjectionMatrix(&self, _cx: *mut JSContext) -> NonNull<JSObject> {
NonNull::new(self.proj.get()).unwrap()
}
/// https://immersive-web.github.io/webxr/#dom-xrview-transform
fn Transform(&self) -> DomRoot<XRRigidTransform> {
DomRoot::from_ref(&self.transform)
}
}
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