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diff --git a/gfx/vr/gfxVR.h b/gfx/vr/gfxVR.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#ifndef GFX_VR_H
+#define GFX_VR_H
+
+#include "moz_external_vr.h"
+#include "nsTArray.h"
+#include "nsString.h"
+#include "nsCOMPtr.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/EnumeratedArray.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/TypedEnumBits.h"
+#include <type_traits>
+
+namespace mozilla {
+namespace layers {
+class PTextureParent;
+}
+namespace dom {
+enum class GamepadMappingType : uint8_t;
+enum class GamepadHand : uint8_t;
+} // namespace dom
+namespace gfx {
+enum class VRAPIMode : uint8_t { WebXR, WebVR, NumVRAPIModes };
+
+class VRLayerParent;
+class VRDisplayHost;
+class VRManagerPromise;
+
+// The maximum number of frames of latency that we would expect before we
+// should give up applying pose prediction.
+// If latency is greater than one second, then the experience is not likely
+// to be corrected by pose prediction. Setting this value too
+// high may result in unnecessary memory allocation.
+// As the current fastest refresh rate is 90hz, 100 is selected as a
+// conservative value.
+static const int kVRMaxLatencyFrames = 100;
+
+struct VRDisplayInfo {
+ uint32_t mDisplayID;
+ uint32_t mPresentingGroups;
+ uint32_t mGroupMask;
+ uint64_t mFrameId;
+ VRDisplayState mDisplayState;
+ VRControllerState mControllerState[kVRControllerMaxCount];
+
+ VRHMDSensorState mLastSensorState[kVRMaxLatencyFrames];
+ void Clear() { memset(this, 0, sizeof(VRDisplayInfo)); }
+ const VRHMDSensorState& GetSensorState() const {
+ return mLastSensorState[mFrameId % kVRMaxLatencyFrames];
+ }
+
+ uint32_t GetDisplayID() const { return mDisplayID; }
+ const char* GetDisplayName() const { return mDisplayState.displayName; }
+ VRDisplayCapabilityFlags GetCapabilities() const {
+ return mDisplayState.capabilityFlags;
+ }
+
+ const IntSize SuggestedEyeResolution() const;
+ const Point3D GetEyeTranslation(uint32_t whichEye) const;
+ const VRFieldOfView& GetEyeFOV(uint32_t whichEye) const {
+ return mDisplayState.eyeFOV[whichEye];
+ }
+ bool GetIsConnected() const { return mDisplayState.isConnected; }
+ bool GetIsMounted() const { return mDisplayState.isMounted; }
+ uint32_t GetPresentingGroups() const { return mPresentingGroups; }
+ uint32_t GetGroupMask() const { return mGroupMask; }
+ const Size GetStageSize() const;
+ const Matrix4x4 GetSittingToStandingTransform() const;
+ uint64_t GetFrameId() const { return mFrameId; }
+
+ bool operator==(const VRDisplayInfo& other) const {
+ for (size_t i = 0; i < kVRMaxLatencyFrames; i++) {
+ if (mLastSensorState[i] != other.mLastSensorState[i]) {
+ return false;
+ }
+ }
+ // Note that mDisplayState and mControllerState are asserted to be POD
+ // types, so memcmp is safe
+ return mDisplayID == other.mDisplayID &&
+ memcmp(&mDisplayState, &other.mDisplayState,
+ sizeof(VRDisplayState)) == 0 &&
+ memcmp(mControllerState, other.mControllerState,
+ sizeof(VRControllerState) * kVRControllerMaxCount) == 0 &&
+ mPresentingGroups == other.mPresentingGroups &&
+ mGroupMask == other.mGroupMask && mFrameId == other.mFrameId;
+ }
+
+ bool operator!=(const VRDisplayInfo& other) const {
+ return !(*this == other);
+ }
+};
+
+static_assert(std::is_pod<VRDisplayInfo>::value,
+ "VRDisplayInfo must be a POD type.");
+
+struct VRSubmitFrameResultInfo {
+ VRSubmitFrameResultInfo()
+ : mFormat(SurfaceFormat::UNKNOWN), mFrameNum(0), mWidth(0), mHeight(0) {}
+
+ nsCString mBase64Image;
+ SurfaceFormat mFormat;
+ uint64_t mFrameNum;
+ uint32_t mWidth;
+ uint32_t mHeight;
+};
+
+struct VRControllerInfo {
+ uint32_t GetControllerID() const { return mControllerID; }
+ const char* GetControllerName() const {
+ return mControllerState.controllerName;
+ }
+ dom::GamepadMappingType GetMappingType() const { return mMappingType; }
+ uint32_t GetDisplayID() const { return mDisplayID; }
+ dom::GamepadHand GetHand() const { return mControllerState.hand; }
+ uint32_t GetNumButtons() const { return mControllerState.numButtons; }
+ uint32_t GetNumAxes() const { return mControllerState.numAxes; }
+ uint32_t GetNumHaptics() const { return mControllerState.numHaptics; }
+
+ uint32_t mControllerID;
+ dom::GamepadMappingType mMappingType;
+ uint32_t mDisplayID;
+ VRControllerState mControllerState;
+ bool operator==(const VRControllerInfo& other) const {
+ // Note that mControllerState is asserted to be a POD type, so memcmp is
+ // safe
+ return mControllerID == other.mControllerID &&
+ memcmp(&mControllerState, &other.mControllerState,
+ sizeof(VRControllerState)) == 0 &&
+ mMappingType == other.mMappingType && mDisplayID == other.mDisplayID;
+ }
+
+ bool operator!=(const VRControllerInfo& other) const {
+ return !(*this == other);
+ }
+};
+
+struct VRTelemetry {
+ VRTelemetry() : mLastDroppedFrameCount(-1) {}
+
+ void Clear() {
+ mPresentationStart = TimeStamp();
+ mLastDroppedFrameCount = -1;
+ }
+
+ bool IsLastDroppedFrameValid() { return (mLastDroppedFrameCount != -1); }
+
+ TimeStamp mPresentationStart;
+ int32_t mLastDroppedFrameCount;
+};
+
+} // namespace gfx
+} // namespace mozilla
+
+#endif /* GFX_VR_H */