gecko-dev/dom/gamepad/GamepadManager.cpp

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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/. */
#include "mozilla/dom/GamepadManager.h"
#include "mozilla/dom/Gamepad.h"
#include "mozilla/dom/GamepadAxisMoveEvent.h"
#include "mozilla/dom/GamepadButtonEvent.h"
#include "mozilla/dom/GamepadEvent.h"
#include "mozilla/dom/GamepadEventChannelChild.h"
#include "mozilla/dom/GamepadMonitoring.h"
#include "mozilla/ipc/BackgroundChild.h"
#include "mozilla/ipc/PBackgroundChild.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/Preferences.h"
#include "mozilla/StaticPtr.h"
#include "nsAutoPtr.h"
#include "nsContentUtils.h"
#include "nsGlobalWindow.h"
#include "nsIDOMWindow.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsIServiceManager.h"
#include "nsThreadUtils.h"
#include "VRManagerChild.h"
#include "mozilla/Services.h"
#include "mozilla/Unused.h"
#include <cstddef>
using namespace mozilla::ipc;
namespace mozilla {
namespace dom {
namespace {
const char* kGamepadEnabledPref = "dom.gamepad.enabled";
const char* kGamepadEventsEnabledPref =
"dom.gamepad.non_standard_events.enabled";
const nsTArray<RefPtr<nsGlobalWindowInner>>::index_type NoIndex =
nsTArray<RefPtr<nsGlobalWindowInner>>::NoIndex;
bool sShutdown = false;
StaticRefPtr<GamepadManager> gGamepadManagerSingleton;
const uint32_t VR_GAMEPAD_IDX_OFFSET = 0x01 << 16;
} // namespace
NS_IMPL_ISUPPORTS(GamepadManager, nsIObserver)
GamepadManager::GamepadManager()
: mEnabled(false),
mNonstandardEventsEnabled(false),
mShuttingDown(false),
mPromiseID(0)
{}
nsresult
GamepadManager::Init()
{
mEnabled = IsAPIEnabled();
mNonstandardEventsEnabled =
Preferences::GetBool(kGamepadEventsEnabledPref, false);
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (NS_WARN_IF(!observerService)) {
return NS_ERROR_FAILURE;
}
nsresult rv;
rv = observerService->AddObserver(this,
NS_XPCOM_WILL_SHUTDOWN_OBSERVER_ID,
false);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
return NS_OK;
}
NS_IMETHODIMP
GamepadManager::Observe(nsISupports* aSubject,
const char* aTopic,
const char16_t* aData)
{
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->RemoveObserver(this, NS_XPCOM_WILL_SHUTDOWN_OBSERVER_ID);
}
BeginShutdown();
return NS_OK;
}
void
GamepadManager::StopMonitoring()
{
for (uint32_t i = 0; i < mChannelChildren.Length(); ++i) {
mChannelChildren[i]->SendGamepadListenerRemoved();
}
if (gfx::VRManagerChild::IsCreated()) {
gfx::VRManagerChild* vm = gfx::VRManagerChild::Get();
vm->SendControllerListenerRemoved();
}
mChannelChildren.Clear();
mGamepads.Clear();
}
void
GamepadManager::BeginShutdown()
{
mShuttingDown = true;
StopMonitoring();
// Don't let windows call back to unregister during shutdown
for (uint32_t i = 0; i < mListeners.Length(); i++) {
mListeners[i]->SetHasGamepadEventListener(false);
}
mListeners.Clear();
sShutdown = true;
}
void
GamepadManager::AddListener(nsGlobalWindowInner* aWindow)
{
MOZ_ASSERT(aWindow);
MOZ_ASSERT(NS_IsMainThread());
// IPDL child has not been created
if (mChannelChildren.IsEmpty()) {
PBackgroundChild* actor = BackgroundChild::GetOrCreateForCurrentThread();
if (NS_WARN_IF(!actor)) {
// We are probably shutting down.
return;
}
GamepadEventChannelChild *child = new GamepadEventChannelChild();
PGamepadEventChannelChild *initedChild =
actor->SendPGamepadEventChannelConstructor(child);
if (NS_WARN_IF(!initedChild)) {
// We are probably shutting down.
return;
}
MOZ_ASSERT(initedChild == child);
child->SendGamepadListenerAdded();
mChannelChildren.AppendElement(child);
if (gfx::VRManagerChild::IsCreated()) {
// Construct VRManagerChannel and ask adding the connected
// VR controllers to GamepadManager
gfx::VRManagerChild* vm = gfx::VRManagerChild::Get();
vm->SendControllerListenerAdded();
}
}
if (!mEnabled || mShuttingDown || nsContentUtils::ShouldResistFingerprinting()) {
return;
}
if (mListeners.IndexOf(aWindow) != NoIndex) {
return; // already exists
}
mListeners.AppendElement(aWindow);
}
void
GamepadManager::RemoveListener(nsGlobalWindowInner* aWindow)
{
MOZ_ASSERT(aWindow);
if (mShuttingDown) {
// Doesn't matter at this point. It's possible we're being called
// as a result of our own destructor here, so just bail out.
return;
}
if (mListeners.IndexOf(aWindow) == NoIndex) {
return; // doesn't exist
}
for (auto iter = mGamepads.Iter(); !iter.Done(); iter.Next()) {
aWindow->RemoveGamepad(iter.Key());
}
mListeners.RemoveElement(aWindow);
if (mListeners.IsEmpty()) {
StopMonitoring();
}
}
already_AddRefed<Gamepad>
GamepadManager::GetGamepad(uint32_t aIndex) const
{
RefPtr<Gamepad> gamepad;
if (mGamepads.Get(aIndex, getter_AddRefs(gamepad))) {
return gamepad.forget();
}
return nullptr;
}
uint32_t GamepadManager::GetGamepadIndexWithServiceType(uint32_t aIndex,
GamepadServiceType aServiceType)
{
uint32_t newIndex = 0;
switch (aServiceType) {
case GamepadServiceType::Standard:
MOZ_ASSERT(aIndex <= VR_GAMEPAD_IDX_OFFSET);
newIndex = aIndex;
break;
case GamepadServiceType::VR:
newIndex = aIndex + VR_GAMEPAD_IDX_OFFSET;
break;
default:
MOZ_ASSERT(false);
break;
}
return newIndex;
}
void
GamepadManager::AddGamepad(uint32_t aIndex,
const nsAString& aId,
GamepadMappingType aMapping,
GamepadHand aHand,
GamepadServiceType aServiceType,
uint32_t aDisplayID,
uint32_t aNumButtons,
uint32_t aNumAxes,
uint32_t aNumHaptics)
{
uint32_t newIndex = GetGamepadIndexWithServiceType(aIndex, aServiceType);
//TODO: bug 852258: get initial button/axis state
RefPtr<Gamepad> gamepad =
new Gamepad(nullptr,
aId,
0, // index is set by global window
newIndex,
aMapping,
aHand,
aDisplayID,
aNumButtons,
aNumAxes,
aNumHaptics);
// We store the gamepad related to its index given by the parent process,
// and no duplicate index is allowed.
MOZ_ASSERT(!mGamepads.Get(newIndex, nullptr));
mGamepads.Put(newIndex, gamepad);
NewConnectionEvent(newIndex, true);
}
void
GamepadManager::RemoveGamepad(uint32_t aIndex, GamepadServiceType aServiceType)
{
uint32_t newIndex = GetGamepadIndexWithServiceType(aIndex, aServiceType);
RefPtr<Gamepad> gamepad = GetGamepad(newIndex);
if (!gamepad) {
NS_WARNING("Trying to delete gamepad with invalid index");
return;
}
gamepad->SetConnected(false);
NewConnectionEvent(newIndex, false);
mGamepads.Remove(newIndex);
}
void
GamepadManager::FireButtonEvent(EventTarget* aTarget,
Gamepad* aGamepad,
uint32_t aButton,
double aValue)
{
nsString name = aValue == 1.0L ? NS_LITERAL_STRING("gamepadbuttondown") :
NS_LITERAL_STRING("gamepadbuttonup");
GamepadButtonEventInit init;
init.mBubbles = false;
init.mCancelable = false;
init.mGamepad = aGamepad;
init.mButton = aButton;
RefPtr<GamepadButtonEvent> event =
GamepadButtonEvent::Constructor(aTarget, name, init);
event->SetTrusted(true);
aTarget->DispatchEvent(*event);
}
void
GamepadManager::FireAxisMoveEvent(EventTarget* aTarget,
Gamepad* aGamepad,
uint32_t aAxis,
double aValue)
{
GamepadAxisMoveEventInit init;
init.mBubbles = false;
init.mCancelable = false;
init.mGamepad = aGamepad;
init.mAxis = aAxis;
init.mValue = aValue;
RefPtr<GamepadAxisMoveEvent> event =
GamepadAxisMoveEvent::Constructor(aTarget,
NS_LITERAL_STRING("gamepadaxismove"),
init);
event->SetTrusted(true);
aTarget->DispatchEvent(*event);
}
void
GamepadManager::NewConnectionEvent(uint32_t aIndex, bool aConnected)
{
// Do not fire gamepadconnected and gamepaddisconnected events when
// privacy.resistFingerprinting is true.
if (nsContentUtils::ShouldResistFingerprinting()) {
return;
}
if (mShuttingDown) {
return;
}
RefPtr<Gamepad> gamepad = GetGamepad(aIndex);
if (!gamepad) {
return;
}
// Hold on to listeners in a separate array because firing events
// can mutate the mListeners array.
nsTArray<RefPtr<nsGlobalWindowInner>> listeners(mListeners);
if (aConnected) {
for (uint32_t i = 0; i < listeners.Length(); i++) {
// Only send events to non-background windows
if (!listeners[i]->AsInner()->IsCurrentInnerWindow() ||
listeners[i]->GetOuterWindow()->IsBackground()) {
continue;
}
// We don't fire a connected event here unless the window
// has seen input from at least one device.
if (!listeners[i]->HasSeenGamepadInput()) {
continue;
}
SetWindowHasSeenGamepad(listeners[i], aIndex);
RefPtr<Gamepad> listenerGamepad = listeners[i]->GetGamepad(aIndex);
if (listenerGamepad) {
// Fire event
FireConnectionEvent(listeners[i], listenerGamepad, aConnected);
}
}
} else {
// For disconnection events, fire one at every window that has received
// data from this gamepad.
for (uint32_t i = 0; i < listeners.Length(); i++) {
// Even background windows get these events, so we don't have to
// deal with the hassle of syncing the state of removed gamepads.
if (WindowHasSeenGamepad(listeners[i], aIndex)) {
RefPtr<Gamepad> listenerGamepad = listeners[i]->GetGamepad(aIndex);
if (listenerGamepad) {
listenerGamepad->SetConnected(false);
// Fire event
FireConnectionEvent(listeners[i], listenerGamepad, false);
listeners[i]->RemoveGamepad(aIndex);
}
}
}
}
}
void
GamepadManager::FireConnectionEvent(EventTarget* aTarget,
Gamepad* aGamepad,
bool aConnected)
{
nsString name = aConnected ? NS_LITERAL_STRING("gamepadconnected") :
NS_LITERAL_STRING("gamepaddisconnected");
GamepadEventInit init;
init.mBubbles = false;
init.mCancelable = false;
init.mGamepad = aGamepad;
RefPtr<GamepadEvent> event =
GamepadEvent::Constructor(aTarget, name, init);
event->SetTrusted(true);
aTarget->DispatchEvent(*event);
}
void
GamepadManager::SyncGamepadState(uint32_t aIndex, Gamepad* aGamepad)
{
if (mShuttingDown || !mEnabled || nsContentUtils::ShouldResistFingerprinting()) {
return;
}
RefPtr<Gamepad> gamepad = GetGamepad(aIndex);
if (!gamepad) {
return;
}
aGamepad->SyncState(gamepad);
}
// static
bool
GamepadManager::IsServiceRunning()
{
return !!gGamepadManagerSingleton;
}
// static
already_AddRefed<GamepadManager>
GamepadManager::GetService()
{
if (sShutdown) {
return nullptr;
}
if (!gGamepadManagerSingleton) {
RefPtr<GamepadManager> manager = new GamepadManager();
nsresult rv = manager->Init();
if(NS_WARN_IF(NS_FAILED(rv))) {
return nullptr;
}
gGamepadManagerSingleton = manager;
ClearOnShutdown(&gGamepadManagerSingleton);
}
RefPtr<GamepadManager> service(gGamepadManagerSingleton);
return service.forget();
}
// static
bool
GamepadManager::IsAPIEnabled() {
return Preferences::GetBool(kGamepadEnabledPref, false);
}
bool
GamepadManager::MaybeWindowHasSeenGamepad(nsGlobalWindowInner* aWindow, uint32_t aIndex)
{
if (!WindowHasSeenGamepad(aWindow, aIndex)) {
// This window hasn't seen this gamepad before, so
// send a connection event first.
SetWindowHasSeenGamepad(aWindow, aIndex);
return true;
}
return false;
}
bool
GamepadManager::WindowHasSeenGamepad(nsGlobalWindowInner* aWindow, uint32_t aIndex) const
{
RefPtr<Gamepad> gamepad = aWindow->GetGamepad(aIndex);
return gamepad != nullptr;
}
void
GamepadManager::SetWindowHasSeenGamepad(nsGlobalWindowInner* aWindow,
uint32_t aIndex,
bool aHasSeen)
{
MOZ_ASSERT(aWindow);
if (mListeners.IndexOf(aWindow) == NoIndex) {
// This window isn't even listening for gamepad events.
return;
}
if (aHasSeen) {
aWindow->SetHasSeenGamepadInput(true);
nsCOMPtr<nsISupports> window = ToSupports(aWindow);
RefPtr<Gamepad> gamepad = GetGamepad(aIndex);
if (!gamepad) {
return;
}
RefPtr<Gamepad> clonedGamepad = gamepad->Clone(window);
aWindow->AddGamepad(aIndex, clonedGamepad);
} else {
aWindow->RemoveGamepad(aIndex);
}
}
void
GamepadManager::Update(const GamepadChangeEvent& aEvent)
{
if (!mEnabled || mShuttingDown || nsContentUtils::ShouldResistFingerprinting()) {
return;
}
const uint32_t index = aEvent.index();
GamepadServiceType serviceType = aEvent.service_type();
GamepadChangeEventBody body = aEvent.body();
if (body.type() == GamepadChangeEventBody::TGamepadAdded) {
const GamepadAdded& a = body.get_GamepadAdded();
AddGamepad(index, a.id(),
static_cast<GamepadMappingType>(a.mapping()),
static_cast<GamepadHand>(a.hand()),
serviceType,
a.display_id(),
a.num_buttons(), a.num_axes(),
a.num_haptics());
return;
}
if (body.type() == GamepadChangeEventBody::TGamepadRemoved) {
RemoveGamepad(index, serviceType);
return;
}
if (!SetGamepadByEvent(aEvent)) {
return;
}
// Hold on to listeners in a separate array because firing events
// can mutate the mListeners array.
nsTArray<RefPtr<nsGlobalWindowInner>> listeners(mListeners);
for (uint32_t i = 0; i < listeners.Length(); i++) {
// Only send events to non-background windows
if (!listeners[i]->AsInner()->IsCurrentInnerWindow() ||
listeners[i]->GetOuterWindow()->IsBackground()) {
continue;
}
SetGamepadByEvent(aEvent, listeners[i]);
MaybeConvertToNonstandardGamepadEvent(aEvent, listeners[i]);
}
}
void
GamepadManager::MaybeConvertToNonstandardGamepadEvent(const GamepadChangeEvent& aEvent,
nsGlobalWindowInner* aWindow)
{
MOZ_ASSERT(aWindow);
if (!mNonstandardEventsEnabled) {
return;
}
const uint32_t index = GetGamepadIndexWithServiceType(aEvent.index(),
aEvent.service_type());
RefPtr<Gamepad> gamepad = aWindow->GetGamepad(index);
const GamepadChangeEventBody& body = aEvent.body();
if (gamepad) {
switch (body.type()) {
case GamepadChangeEventBody::TGamepadButtonInformation:
{
const GamepadButtonInformation& a = body.get_GamepadButtonInformation();
FireButtonEvent(aWindow, gamepad, a.button(), a.value());
break;
}
case GamepadChangeEventBody::TGamepadAxisInformation:
{
const GamepadAxisInformation& a = body.get_GamepadAxisInformation();
FireAxisMoveEvent(aWindow, gamepad, a.axis(), a.value());
break;
}
default:
break;
}
}
}
bool
GamepadManager::SetGamepadByEvent(const GamepadChangeEvent& aEvent, nsGlobalWindowInner *aWindow)
{
bool ret = false;
bool firstTime = false;
const uint32_t index = GetGamepadIndexWithServiceType(aEvent.index(),
aEvent.service_type());
if (aWindow) {
firstTime = MaybeWindowHasSeenGamepad(aWindow, index);
}
RefPtr<Gamepad> gamepad = aWindow ? aWindow->GetGamepad(index) : GetGamepad(index);
const GamepadChangeEventBody& body = aEvent.body();
if (gamepad) {
switch (body.type()) {
case GamepadChangeEventBody::TGamepadButtonInformation:
{
const GamepadButtonInformation& a = body.get_GamepadButtonInformation();
gamepad->SetButton(a.button(), a.pressed(), a.touched(), a.value());
break;
}
case GamepadChangeEventBody::TGamepadAxisInformation:
{
const GamepadAxisInformation& a = body.get_GamepadAxisInformation();
gamepad->SetAxis(a.axis(), a.value());
break;
}
case GamepadChangeEventBody::TGamepadPoseInformation:
{
const GamepadPoseInformation& a = body.get_GamepadPoseInformation();
gamepad->SetPose(a.pose_state());
break;
}
case GamepadChangeEventBody::TGamepadHandInformation:
{
const GamepadHandInformation& a = body.get_GamepadHandInformation();
gamepad->SetHand(a.hand());
break;
}
default:
MOZ_ASSERT(false);
break;
}
ret = true;
}
if (aWindow && firstTime) {
FireConnectionEvent(aWindow, gamepad, true);
}
return ret;
}
already_AddRefed<Promise>
GamepadManager::VibrateHaptic(uint32_t aControllerIdx, uint32_t aHapticIndex,
double aIntensity, double aDuration,
nsIGlobalObject* aGlobal, ErrorResult& aRv)
{
const char* kGamepadHapticEnabledPref = "dom.gamepad.haptic_feedback.enabled";
RefPtr<Promise> promise = Promise::Create(aGlobal, aRv);
if (NS_WARN_IF(aRv.Failed())) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
if (Preferences::GetBool(kGamepadHapticEnabledPref)) {
if (aControllerIdx >= VR_GAMEPAD_IDX_OFFSET) {
if (gfx::VRManagerChild::IsCreated()) {
const uint32_t index = aControllerIdx - VR_GAMEPAD_IDX_OFFSET;
gfx::VRManagerChild* vm = gfx::VRManagerChild::Get();
vm->AddPromise(mPromiseID, promise);
vm->SendVibrateHaptic(index, aHapticIndex,
aIntensity, aDuration,
mPromiseID);
}
} else {
for (const auto& channelChild: mChannelChildren) {
channelChild->AddPromise(mPromiseID, promise);
channelChild->SendVibrateHaptic(aControllerIdx, aHapticIndex,
aIntensity, aDuration,
mPromiseID);
}
}
}
++mPromiseID;
return promise.forget();
}
void
GamepadManager::StopHaptics()
{
const char* kGamepadHapticEnabledPref = "dom.gamepad.haptic_feedback.enabled";
if (!Preferences::GetBool(kGamepadHapticEnabledPref)) {
return;
}
for (auto iter = mGamepads.Iter(); !iter.Done(); iter.Next()) {
const uint32_t gamepadIndex = iter.UserData()->HashKey();
if (gamepadIndex >= VR_GAMEPAD_IDX_OFFSET) {
if (gfx::VRManagerChild::IsCreated()) {
const uint32_t index = gamepadIndex - VR_GAMEPAD_IDX_OFFSET;
gfx::VRManagerChild* vm = gfx::VRManagerChild::Get();
vm->SendStopVibrateHaptic(index);
}
} else {
for (auto& channelChild : mChannelChildren) {
channelChild->SendStopVibrateHaptic(gamepadIndex);
}
}
}
}
} // namespace dom
} // namespace mozilla