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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_XR_XR_OBJECT_SPACE_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_XR_XR_OBJECT_SPACE_H_
#include "third_party/blink/renderer/modules/xr/xr_space.h"
#include "third_party/blink/renderer/platform/transforms/transformation_matrix.h"
namespace blink {
class XRSession;
// Helper class that returns an XRSpace that tracks the position of object of
// type T (for example XRPlane, XRAnchor). The type T has to have a
// MojoFromObject() method, returning a base::Optional<TransformationMatrix>.
//
// If the object's MojoFromObject() method returns a base::nullopt, it means
// that the object is not localizable in the current frame (i.e. its pose is
// unknown) - the `frame.getPose(objectSpace, otherSpace)` will return null.
// That does not necessarily mean that object tracking is lost - it may be that
// the object's location will become known in subsequent frames.
template <typename T>
class XRObjectSpace : public XRSpace {
public:
explicit XRObjectSpace(XRSession* session, const T* object)
: XRSpace(session), object_(object) {}
base::Optional<TransformationMatrix> MojoFromNative() override {
return object_->MojoFromObject();
}
base::Optional<TransformationMatrix> NativeFromMojo() final {
return XRSpace::TryInvert(MojoFromNative());
}
base::Optional<XRNativeOriginInformation> NativeOrigin() const override {
return XRNativeOriginInformation::Create(object_);
}
bool IsStationary() const override {
// Object spaces are considered stationary - they are supposed to remain
// fixed relative to their surroundings (at least locally).
return true;
}
void Trace(Visitor* visitor) override {
visitor->Trace(object_);
XRSpace::Trace(visitor);
}
private:
Member<const T> object_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_XR_XR_OBJECT_SPACE_H_
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