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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
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