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Add XRSpace::get_viewer_pose()
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4 changed files with 103 additions and 0 deletions
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@ -4,6 +4,7 @@
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use crate::dom::bindings::codegen::Bindings::XRReferenceSpaceBinding;
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use crate::dom::bindings::codegen::Bindings::XRReferenceSpaceBinding::XRReferenceSpaceMethods;
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use crate::dom::bindings::inheritance::Castable;
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use crate::dom::bindings::reflector::reflect_dom_object;
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use crate::dom::bindings::root::{DomRoot, MutDom};
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use crate::dom::dompointreadonly::DOMPointReadOnly;
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@ -11,7 +12,10 @@ use crate::dom::window::Window;
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use crate::dom::xrrigidtransform::XRRigidTransform;
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use crate::dom::xrsession::XRSession;
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use crate::dom::xrspace::XRSpace;
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use crate::dom::xrstationaryreferencespace::XRStationaryReferenceSpace;
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use dom_struct::dom_struct;
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use euclid::Transform3D;
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use webvr_traits::WebVRFrameData;
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#[dom_struct]
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pub struct XRReferenceSpace {
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@ -64,3 +68,33 @@ impl XRReferenceSpaceMethods for XRReferenceSpace {
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self.transform.get()
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}
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}
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impl XRReferenceSpace {
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/// Gets viewer pose represented by this space
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pub fn get_viewer_pose(&self, base_pose: &WebVRFrameData) -> Transform3D<f64> {
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let pose = self.get_pose(base_pose);
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// This may change, see https://github.com/immersive-web/webxr/issues/567
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let offset = self.transform.get().matrix();
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// XXXManishearth we can directly compute the inverse from the transform parameters
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// (and perhaps cache it)
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// XXXManishearth we can also optimize for the unset/identity offset case
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let inverse = offset
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.inverse()
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.expect("rigid transforms are always invertible");
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inverse.pre_mul(&pose)
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}
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/// Gets pose represented by this space
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///
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/// Does not apply originOffset, use get_viewer_pose instead if you need it
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pub fn get_pose(&self, base_pose: &WebVRFrameData) -> Transform3D<f64> {
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if let Some(stationary) = self.downcast::<XRStationaryReferenceSpace>() {
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stationary.get_pose(base_pose)
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} else {
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// non-subclassed XRReferenceSpaces exist, obtained via the "identity"
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// type. The pose does not depend on the base pose.
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Transform3D::identity()
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}
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}
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}
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