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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::XRReferenceSpaceBinding;
use crate::dom::bindings::codegen::Bindings::XRReferenceSpaceBinding::XRReferenceSpaceMethods;
use crate::dom::bindings::inheritance::Castable;
use crate::dom::bindings::reflector::reflect_dom_object;
use crate::dom::bindings::root::{DomRoot, MutDom};
use crate::dom::window::Window;
use crate::dom::xrrigidtransform::XRRigidTransform;
use crate::dom::xrsession::XRSession;
use crate::dom::xrspace::XRSpace;
use crate::dom::xrstationaryreferencespace::XRStationaryReferenceSpace;
use dom_struct::dom_struct;
use euclid::Transform3D;
use webvr_traits::WebVRFrameData;
#[dom_struct]
pub struct XRReferenceSpace {
xrspace: XRSpace,
transform: MutDom<XRRigidTransform>,
}
impl XRReferenceSpace {
pub fn new_inherited(session: &XRSession, transform: &XRRigidTransform) -> XRReferenceSpace {
XRReferenceSpace {
xrspace: XRSpace::new_inherited(session),
transform: MutDom::new(transform),
}
}
#[allow(unused)]
pub fn identity(global: &Window, session: &XRSession) -> DomRoot<XRReferenceSpace> {
let transform = XRRigidTransform::identity(global);
reflect_dom_object(
Box::new(XRReferenceSpace::new_inherited(session, &transform)),
global,
XRReferenceSpaceBinding::Wrap,
)
}
}
impl XRReferenceSpaceMethods for XRReferenceSpace {
/// https://immersive-web.github.io/webxr/#dom-xrreferencespace-originoffset
fn SetOriginOffset(&self, transform: &XRRigidTransform) {
self.transform.set(transform);
}
/// https://immersive-web.github.io/webxr/#dom-xrreferencespace-originoffset
fn OriginOffset(&self) -> DomRoot<XRRigidTransform> {
self.transform.get()
}
}
impl XRReferenceSpace {
/// Gets viewer pose represented by this space
pub fn get_viewer_pose(&self, base_pose: &WebVRFrameData) -> Transform3D<f64> {
let pose = self.get_pose(base_pose);
// This may change, see https://github.com/immersive-web/webxr/issues/567
let offset = self.transform.get().matrix();
// XXXManishearth we can directly compute the inverse from the transform parameters
// (and perhaps cache it)
// XXXManishearth we can also optimize for the unset/identity offset case
let inverse = offset
.inverse()
.expect("rigid transforms are always invertible");
inverse.pre_mul(&pose)
}
/// Gets pose represented by this space
///
/// Does not apply originOffset, use get_viewer_pose instead if you need it
pub fn get_pose(&self, base_pose: &WebVRFrameData) -> Transform3D<f64> {
if let Some(stationary) = self.downcast::<XRStationaryReferenceSpace>() {
stationary.get_pose(base_pose)
} else {
// non-subclassed XRReferenceSpaces exist, obtained via the "identity"
// type. The pose does not depend on the base pose.
Transform3D::identity()
}
}
}
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