1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 #ifndef GFX_VR_SERVICE_VRSERVICE_H 8 #define GFX_VR_SERVICE_VRSERVICE_H 9 10 #include "moz_external_vr.h" 11 #include "base/process.h" // for base::ProcessHandle 12 #include "mozilla/Atomics.h" 13 #include "mozilla/TimeStamp.h" 14 #include "mozilla/UniquePtr.h" 15 #include "nsCOMPtr.h" 16 17 class nsIThread; 18 namespace mozilla { 19 class BackgroundHangMonitor; 20 namespace gfx { 21 22 class VRSession; 23 class VRShMem; 24 25 static const int kVRFrameTimingHistoryDepth = 100; 26 27 class VRService { 28 public: 29 NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VRService) 30 static already_AddRefed<VRService> Create( 31 volatile VRExternalShmem* aShmem = nullptr); 32 33 void Refresh(); 34 void Start(); 35 void Stop(); 36 37 private: 38 explicit VRService(volatile VRExternalShmem* aShmem); 39 ~VRService(); 40 41 void StopInternal(bool aFromDtor); 42 43 bool InitShmem(); 44 void PushState(const mozilla::gfx::VRSystemState& aState); 45 void PullState(mozilla::gfx::VRBrowserState& aState); 46 47 /** 48 * VRSystemState contains the most recent state of the VR 49 * system, to be shared with the browser by Shmem. 50 * mSystemState is the VR Service copy of this data, which 51 * is memcpy'ed atomically to the Shmem. 52 * VRSystemState is written by the VR Service, but read-only 53 * by the browser. 54 */ 55 VRSystemState mSystemState; 56 /** 57 * VRBrowserState contains the most recent state of the browser. 58 * mBrowserState is memcpy'ed from the Shmem atomically 59 */ 60 VRBrowserState mBrowserState; 61 62 UniquePtr<VRSession> mSession; 63 nsCOMPtr<nsIThread> mServiceThread; 64 // Only ever accessed on the service thread. 65 UniquePtr<mozilla::BackgroundHangMonitor> mBackgroundHangMonitor; 66 67 Atomic<bool> mShutdownRequested; 68 69 // Note: mShmem doesn't support RefPtr; thus, do not share this private 70 // pointer so that its lifetime can still be controlled by VRService 71 VRShMem* mShmem; 72 VRHapticState mLastHapticState[kVRHapticsMaxCount]; 73 TimeStamp mFrameStartTime[kVRFrameTimingHistoryDepth]; 74 75 bool IsInServiceThread(); 76 void UpdateHaptics(); 77 78 /** 79 * The VR Service thread is a state machine that always has one 80 * task queued depending on the state. 81 * 82 * VR Service thread state task functions: 83 */ 84 void ServiceInitialize(); 85 void ServiceShutdown(); 86 void ServiceWaitForImmersive(); 87 void ServiceImmersiveMode(); 88 }; 89 90 } // namespace gfx 91 } // namespace mozilla 92 93 #endif // GFX_VR_SERVICE_VRSERVICE_H 94