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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::globalscope::GlobalScope;
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::RigidTransform3D;
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: &GlobalScope, 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 pose of the viewer with respect to this space
///
/// This is equivalent to `get_pose(self).inverse() * get_pose(viewerSpace)` (in column vector notation),
/// however we specialize it to be efficient
pub fn get_viewer_pose(&self, base_pose: &WebVRFrameData) -> RigidTransform3D<f64> {
let pose = self.get_unoffset_viewer_pose(base_pose);
// This may change, see https://github.com/immersive-web/webxr/issues/567
// in column-vector notation,
// get_viewer_pose(space) = get_pose(space).inverse() * get_pose(viewer_space)
// = (get_unoffset_pose(space) * offset).inverse() * get_pose(viewer_space)
// = offset.inverse() * get_unoffset_pose(space).inverse() * get_pose(viewer_space)
// = offset.inverse() * get_unoffset_viewer_pose(space)
let offset = self.transform.get().transform();
let inverse = offset.inverse();
inverse.pre_mul(&pose)
}
/// Gets pose of the viewer with respect to this space
///
/// Does not apply originOffset, use get_viewer_pose instead if you need it
pub fn get_unoffset_viewer_pose(&self, base_pose: &WebVRFrameData) -> RigidTransform3D<f64> {
if let Some(stationary) = self.downcast::<XRStationaryReferenceSpace>() {
stationary.get_unoffset_viewer_pose(base_pose)
} else {
// non-subclassed XRReferenceSpaces exist, obtained via the "identity"
// type. These poses are equivalent to the viewer pose and follow the headset
// around, so the viewer is always at an identity transform with respect to them
RigidTransform3D::identity()
}
}
/// Gets pose represented by this space
///
/// The reference origin used is common between all
/// get_pose calls for spaces from the same device, so this can be used to compare
/// with other spaces
pub fn get_pose(&self, base_pose: &WebVRFrameData) -> RigidTransform3D<f64> {
let pose = self.get_unoffset_pose(base_pose);
// This may change, see https://github.com/immersive-web/webxr/issues/567
let offset = self.transform.get().transform();
offset.post_mul(&pose)
}
/// Gets pose represented by this space
///
/// Does not apply originOffset, use get_viewer_pose instead if you need it
pub fn get_unoffset_pose(&self, base_pose: &WebVRFrameData) -> RigidTransform3D<f64> {
if let Some(stationary) = self.downcast::<XRStationaryReferenceSpace>() {
stationary.get_unoffset_pose(base_pose)
} else {
// non-subclassed XRReferenceSpaces exist, obtained via the "identity"
// type. These are equivalent to the viewer pose and follow the headset
// around
XRSpace::pose_to_transform(&base_pose.pose)
}
}
}
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