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Add XRSpace::get_viewer_pose()

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This commit is contained in:
Manish Goregaokar 2019-03-21 14:50:02 -07:00
parent 1e1f527c82
commit d1d8e97c30
4 changed files with 103 additions and 0 deletions
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34
components/script/dom/xrreferencespace.rs
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@ -4,6 +4,7 @@
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::dompointreadonly::DOMPointReadOnly;
@ -11,7 +12,10 @@ 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 {
@ -64,3 +68,33 @@ impl XRReferenceSpaceMethods for XRReferenceSpace {
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()
}
}
}