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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://immersive-web.github.io/webvr/spec/1.1/
+ */
+
+enum VREye {
+  "left",
+  "right"
+};
+
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h",
+ SecureContext,
+ Exposed=Window]
+interface VRFieldOfView {
+  readonly attribute double upDegrees;
+  readonly attribute double rightDegrees;
+  readonly attribute double downDegrees;
+  readonly attribute double leftDegrees;
+};
+
+typedef (HTMLCanvasElement or OffscreenCanvas) VRSource;
+
+dictionary VRLayer {
+  /**
+   * XXX - When WebVR in WebWorkers is implemented, HTMLCanvasElement below
+   *       should be replaced with VRSource.
+   */
+  HTMLCanvasElement? source = null;
+
+  /**
+   * The left and right viewports contain 4 values defining the viewport
+   * rectangles within the canvas to present to the eye in UV space.
+   * [0] left offset of the viewport (0.0 - 1.0)
+   * [1] top offset of the viewport (0.0 - 1.0)
+   * [2] width of the viewport (0.0 - 1.0)
+   * [3] height of the viewport (0.0 - 1.0)
+   *
+   * When no values are passed, they will be processed as though the left
+   * and right sides of the viewport were passed:
+   *
+   * leftBounds: [0.0, 0.0, 0.5, 1.0]
+   * rightBounds: [0.5, 0.0, 0.5, 1.0]
+   */
+  sequence<float> leftBounds = [];
+  sequence<float> rightBounds = [];
+};
+
+/**
+ * Values describing the capabilities of a VRDisplay.
+ * These are expected to be static per-device/per-user.
+ */
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h",
+ SecureContext,
+ Exposed=Window]
+interface VRDisplayCapabilities {
+  /**
+   * hasPosition is true if the VRDisplay is capable of tracking its position.
+   */
+  readonly attribute boolean hasPosition;
+
+  /**
+   * hasOrientation is true if the VRDisplay is capable of tracking its orientation.
+   */
+  readonly attribute boolean hasOrientation;
+
+  /**
+   * Whether the VRDisplay is separate from the device’s
+   * primary display. If presenting VR content will obscure
+   * other content on the device, this should be false. When
+   * false, the application should not attempt to mirror VR content
+   * or update non-VR UI because that content will not be visible.
+   */
+  readonly attribute boolean hasExternalDisplay;
+
+  /**
+   * Whether the VRDisplay is capable of presenting content to an HMD or similar device.
+   * Can be used to indicate “magic window” devices that are capable of 6DoF tracking but for
+   * which requestPresent is not meaningful. If false then calls to requestPresent should
+   * always fail, and getEyeParameters should return null.
+   */
+  readonly attribute boolean canPresent;
+
+  /**
+   * Indicates the maximum length of the array that requestPresent() will accept. MUST be 1 if
+     canPresent is true, 0 otherwise.
+   */
+  readonly attribute unsigned long maxLayers;
+};
+
+/**
+ * Values describing the the stage / play area for devices
+ * that support room-scale experiences.
+ */
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h",
+ SecureContext,
+ Exposed=Window]
+interface VRStageParameters {
+  /**
+   * A 16-element array containing the components of a column-major 4x4
+   * affine transform matrix. This matrix transforms the sitting-space position
+   * returned by get{Immediate}Pose() to a standing-space position.
+   */
+  [Throws] readonly attribute Float32Array sittingToStandingTransform;
+
+  /**
+   * Dimensions of the play-area bounds. The bounds are defined
+   * as an axis-aligned rectangle on the floor.
+   * The center of the rectangle is at (0,0,0) in standing-space
+   * coordinates.
+   * These bounds are defined for safety purposes.
+   * Content should not require the user to move beyond these
+   * bounds; however, it is possible for the user to ignore
+   * the bounds resulting in position values outside of
+   * this rectangle.
+   */
+  readonly attribute float sizeX;
+  readonly attribute float sizeZ;
+};
+
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h",
+ SecureContext,
+ Exposed=Window]
+interface VRPose
+{
+  /**
+   * position, linearVelocity, and linearAcceleration are 3-component vectors.
+   * position is relative to a sitting space. Transforming this point with
+   * VRStageParameters.sittingToStandingTransform converts this to standing space.
+   */
+  [Constant, Throws] readonly attribute Float32Array? position;
+  [Constant, Throws] readonly attribute Float32Array? linearVelocity;
+  [Constant, Throws] readonly attribute Float32Array? linearAcceleration;
+
+  /* orientation is a 4-entry array representing the components of a quaternion. */
+  [Constant, Throws] readonly attribute Float32Array? orientation;
+  /* angularVelocity and angularAcceleration are the components of 3-dimensional vectors. */
+  [Constant, Throws] readonly attribute Float32Array? angularVelocity;
+  [Constant, Throws] readonly attribute Float32Array? angularAcceleration;
+};
+
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h",
+ SecureContext,
+ Exposed=Window]
+interface VRFrameData {
+  constructor();
+
+  readonly attribute DOMHighResTimeStamp timestamp;
+
+  [Throws, Pure] readonly attribute Float32Array leftProjectionMatrix;
+  [Throws, Pure] readonly attribute Float32Array leftViewMatrix;
+
+  [Throws, Pure] readonly attribute Float32Array rightProjectionMatrix;
+  [Throws, Pure] readonly attribute Float32Array rightViewMatrix;
+
+  [Pure] readonly attribute VRPose pose;
+};
+
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h",
+ SecureContext,
+ Exposed=Window]
+interface VREyeParameters {
+  /**
+   * offset is a 3-component vector representing an offset to
+   * translate the eye. This value may vary from frame
+   * to frame if the user adjusts their headset ipd.
+   */
+  [Constant, Throws] readonly attribute Float32Array offset;
+
+  /* These values may vary as the user adjusts their headset ipd. */
+  [Constant] readonly attribute VRFieldOfView fieldOfView;
+
+  /**
+   * renderWidth and renderHeight specify the recommended render target
+   * size of each eye viewport, in pixels. If multiple eyes are rendered
+   * in a single render target, then the render target should be made large
+   * enough to fit both viewports.
+   */
+  [Constant] readonly attribute unsigned long renderWidth;
+  [Constant] readonly attribute unsigned long renderHeight;
+};
+
+[Pref="dom.vr.enabled",
+ HeaderFile="mozilla/dom/VRDisplay.h",
+ SecureContext,
+ Exposed=Window]
+interface VRDisplay : EventTarget {
+  /**
+   * presentingGroups is a bitmask indicating which VR session groups
+   * have an active VR presentation.
+   */
+  [ChromeOnly] readonly attribute unsigned long presentingGroups;
+  /**
+   * Setting groupMask causes submitted frames by VR sessions that
+   * aren't included in the bitmasked groups to be ignored.
+   * Non-chrome content is not aware of the value of groupMask.
+   * VRDisplay.RequestAnimationFrame will still fire for VR sessions
+   * that are hidden by groupMask, enabling their performance to be
+   * measured by chrome UI that is presented in other groups.
+   * This is expected to be used in cases where chrome UI is presenting
+   * information during link traversal or presenting options when content
+   * performance is too low for comfort.
+   * The VR refresh / VSync cycle is driven by the visible content
+   * and the non-visible content may have a throttled refresh rate.
+   */
+  [ChromeOnly] attribute unsigned long groupMask;
+
+  readonly attribute boolean isConnected;
+  readonly attribute boolean isPresenting;
+
+  /**
+   * Dictionary of capabilities describing the VRDisplay.
+   */
+  [Constant] readonly attribute VRDisplayCapabilities capabilities;
+
+  /**
+   * If this VRDisplay supports room-scale experiences, the optional
+   * stage attribute contains details on the room-scale parameters.
+   */
+  readonly attribute VRStageParameters? stageParameters;
+
+  /* Return the current VREyeParameters for the given eye. */
+  VREyeParameters getEyeParameters(VREye whichEye);
+
+  /**
+   * An identifier for this distinct VRDisplay. Used as an
+   * association point in the Gamepad API.
+   */
+  [Constant] readonly attribute unsigned long displayId;
+
+  /**
+   * A display name, a user-readable name identifying it.
+   */
+  [Constant] readonly attribute DOMString displayName;
+
+  /**
+   * Populates the passed VRFrameData with the information required to render
+   * the current frame.
+   */
+  boolean getFrameData(VRFrameData frameData);
+
+  /**
+   * Return a VRPose containing the future predicted pose of the VRDisplay
+   * when the current frame will be presented. Subsequent calls to getPose()
+   * MUST return a VRPose with the same values until the next call to
+   * submitFrame().
+   *
+   * The VRPose will contain the position, orientation, velocity,
+   * and acceleration of each of these properties.
+   */
+  [NewObject] VRPose getPose();
+
+  /**
+   * Reset the pose for this display, treating its current position and
+   * orientation as the "origin/zero" values. VRPose.position,
+   * VRPose.orientation, and VRStageParameters.sittingToStandingTransform may be
+   * updated when calling resetPose(). This should be called in only
+   * sitting-space experiences.
+   */
+  void resetPose();
+
+  /**
+   * z-depth defining the near plane of the eye view frustum
+   * enables mapping of values in the render target depth
+   * attachment to scene coordinates. Initially set to 0.01.
+   */
+  attribute double depthNear;
+
+  /**
+   * z-depth defining the far plane of the eye view frustum
+   * enables mapping of values in the render target depth
+   * attachment to scene coordinates. Initially set to 10000.0.
+   */
+  attribute double depthFar;
+
+  /**
+   * The callback passed to `requestAnimationFrame` will be called
+   * any time a new frame should be rendered. When the VRDisplay is
+   * presenting the callback will be called at the native refresh
+   * rate of the HMD. When not presenting this function acts
+   * identically to how window.requestAnimationFrame acts. Content should
+   * make no assumptions of frame rate or vsync behavior as the HMD runs
+   * asynchronously from other displays and at differing refresh rates.
+   */
+  [Throws] long requestAnimationFrame(FrameRequestCallback callback);
+
+  /**
+   * Passing the value returned by `requestAnimationFrame` to
+   * `cancelAnimationFrame` will unregister the callback.
+   */
+  [Throws] void cancelAnimationFrame(long handle);
+
+  /**
+   * Begin presenting to the VRDisplay. Must be called in response to a user gesture.
+   * Repeat calls while already presenting will update the VRLayers being displayed.
+   */
+  [Throws, NeedsCallerType] Promise<void> requestPresent(sequence<VRLayer> layers);
+
+  /**
+   * Stops presenting to the VRDisplay.
+   */
+  [Throws] Promise<void> exitPresent();
+
+  /**
+   * Get the layers currently being presented.
+   */
+  sequence<VRLayer> getLayers();
+
+  /**
+   * The VRLayer provided to the VRDisplay will be captured and presented
+   * in the HMD. Calling this function has the same effect on the source
+   * canvas as any other operation that uses its source image, and canvases
+   * created without preserveDrawingBuffer set to true will be cleared.
+   */
+  void submitFrame();
+};