1 files changed, 93 insertions, 0 deletions
diff --git a/gfx/vr/service/VRService.h b/gfx/vr/service/VRService.h
new file mode 100644
index 0000000000..2e41cd2980
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+++ b/gfx/vr/service/VRService.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_SERVICE_VRSERVICE_H
+#define GFX_VR_SERVICE_VRSERVICE_H
+
+#include "moz_external_vr.h"
+#include "base/process.h"  // for base::ProcessHandle
+#include "mozilla/Atomics.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/UniquePtr.h"
+#include "nsCOMPtr.h"
+
+class nsIThread;
+namespace mozilla {
+class BackgroundHangMonitor;
+namespace gfx {
+
+class VRSession;
+class VRShMem;
+
+static const int kVRFrameTimingHistoryDepth = 100;
+
+class VRService {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VRService)
+  static already_AddRefed<VRService> Create(
+      volatile VRExternalShmem* aShmem = nullptr);
+
+  void Refresh();
+  void Start();
+  void Stop();
+
+ private:
+  explicit VRService(volatile VRExternalShmem* aShmem);
+  ~VRService();
+
+  void StopInternal(bool aFromDtor);
+
+  bool InitShmem();
+  void PushState(const mozilla::gfx::VRSystemState& aState);
+  void PullState(mozilla::gfx::VRBrowserState& aState);
+
+  /**
+   * VRSystemState contains the most recent state of the VR
+   * system, to be shared with the browser by Shmem.
+   * mSystemState is the VR Service copy of this data, which
+   * is memcpy'ed atomically to the Shmem.
+   * VRSystemState is written by the VR Service, but read-only
+   * by the browser.
+   */
+  VRSystemState mSystemState;
+  /**
+   * VRBrowserState contains the most recent state of the browser.
+   * mBrowserState is memcpy'ed from the Shmem atomically
+   */
+  VRBrowserState mBrowserState;
+
+  UniquePtr<VRSession> mSession;
+  nsCOMPtr<nsIThread> mServiceThread;
+  // Only ever accessed on the service thread.
+  UniquePtr<mozilla::BackgroundHangMonitor> mBackgroundHangMonitor;
+
+  Atomic<bool> mShutdownRequested;
+
+  // Note: mShmem doesn't support RefPtr; thus, do not share this private
+  // pointer so that its lifetime can still be controlled by VRService
+  VRShMem* mShmem;
+  VRHapticState mLastHapticState[kVRHapticsMaxCount];
+  TimeStamp mFrameStartTime[kVRFrameTimingHistoryDepth];
+
+  bool IsInServiceThread();
+  void UpdateHaptics();
+
+  /**
+   * The VR Service thread is a state machine that always has one
+   * task queued depending on the state.
+   *
+   * VR Service thread state task functions:
+   */
+  void ServiceInitialize();
+  void ServiceShutdown();
+  void ServiceWaitForImmersive();
+  void ServiceImmersiveMode();
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif  // GFX_VR_SERVICE_VRSERVICE_H