| // 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 "device/vr/public/mojom/vr_service.mojom-blink-forward.h" |
| #include "third_party/blink/renderer/modules/xr/xr_native_origin_information.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<device::mojom::blink::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; |
| } |
| |
| std::string ToString() const override { return "XRObjectSpace"; } |
| |
| void Trace(Visitor* visitor) const 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_ |