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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 */
#include "mozilla/RefPtr.h"
#include "nsISupportsImpl.h"
#include "nsTArray.h"
#include <cstdint>
namespace mozilla {
namespace gfx {
struct VRExternalShmem;
class VRService;
* VRServiceHost is allocated as a singleton in the GPU process.
* It is responsible for allocating VRService either within the GPU process
* or in the VR process.
* When the VR process is enabled, it maintains the state of the VR process,
* starting and stopping it as needed.
* VRServiceHost provides an interface that enables communication of the
* VRService in the same way regardless of it running within the GPU process
* or the VR process.
class VRServiceHost {
static void Init(bool aEnableVRProcess);
static VRServiceHost* Get();
void Refresh();
void StartService();
void StopService();
void Shutdown();
void CreateService(volatile VRExternalShmem* aShmem);
void NotifyVRProcessStarted();
void CheckForPuppetCompletion();
void PuppetSubmit(const nsTArray<uint64_t>& aBuffer);
void PuppetReset();
explicit VRServiceHost(bool aEnableVRProcess);
void RefreshVRProcess();
bool NeedVRProcess();
void CreateVRProcess();
void ShutdownVRProcess();
void SendPuppetResetToVRProcess();
void SendPuppetCheckForCompletionToVRProcess();
void SendPuppetSubmitToVRProcess(const nsTArray<uint64_t>& aBuffer);
// Commands pending to be sent to the puppet device
// once the VR service is started.
nsTArray<uint64_t> mPuppetPendingCommands;
RefPtr<VRService> mVRService;
// mVRProcessEnabled indicates that a separate, VR Process, should be used.
// This may be false if the VR process is disabled with the
// dom.vr.process.enabled preference or when the GPU process is disabled.
// mVRProcessEnabled will not change once the browser is started and does not
// reflect the started / stopped state of the VR Process.
bool mVRProcessEnabled;
// mVRProcessStarted is true when the VR Process is running.
bool mVRProcessStarted;
// mVRServiceReadyInVRProcess is true when the VR Process is running and the
// VRService in the VR Process is ready to accept commands.
bool mVRServiceReadyInVRProcess;
// mVRServiceRequested is true when the VRService is needed. This can be due
// to Web API activity (WebXR, WebVR), browser activity (eg, VR Video
// Playback), or a request to simulate a VR device with the VRServiceTest /
// puppet API. mVRServiceRequested indicates the intended state of the VR
// Service and is not an indication that the VR Service is ready to accept
// requests or that the VR Process is enabled or running. Toggling the
// mVRServiceRequested flag will result in the VR Service and/or the VR
// Process either starting or stopping as needed.
bool mVRServiceRequested;
} // namespace gfx
} // namespace mozilla