diff options
Diffstat (limited to 'widget/gtk/WaylandVsyncSource.cpp')
| -rw-r--r-- | widget/gtk/WaylandVsyncSource.cpp | 431 |
1 files changed, 431 insertions, 0 deletions
diff --git a/widget/gtk/WaylandVsyncSource.cpp b/widget/gtk/WaylandVsyncSource.cpp new file mode 100644 index 0000000000..e5bca04837 --- /dev/null +++ b/widget/gtk/WaylandVsyncSource.cpp @@ -0,0 +1,431 @@ +/* -*- 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/. */ + +#ifdef MOZ_WAYLAND + +# include "WaylandVsyncSource.h" +# include "mozilla/UniquePtr.h" +# include "nsThreadUtils.h" +# include "nsISupportsImpl.h" +# include "MainThreadUtils.h" +# include "mozilla/ScopeExit.h" +# include "nsGtkUtils.h" +# include "mozilla/StaticPrefs_layout.h" +# include "mozilla/StaticPrefs_widget.h" +# include "nsWindow.h" + +# include <gdk/gdkwayland.h> + +# ifdef MOZ_LOGGING +# include "mozilla/Logging.h" +# include "nsTArray.h" +# include "Units.h" +extern mozilla::LazyLogModule gWidgetVsync; +# undef LOG +# define LOG(str, ...) \ + MOZ_LOG(gWidgetVsync, mozilla::LogLevel::Debug, \ + ("[nsWindow %p]: " str, GetWindowForLogging(), ##__VA_ARGS__)) +# else +# define LOG(...) +# endif /* MOZ_LOGGING */ + +using namespace mozilla::widget; + +namespace mozilla { + +static void WaylandVsyncSourceCallbackHandler(void* aData, + struct wl_callback* aCallback, + uint32_t aTime) { + RefPtr context = static_cast<WaylandVsyncSource*>(aData); + context->FrameCallback(aCallback, aTime); +} + +static const struct wl_callback_listener WaylandVsyncSourceCallbackListener = { + WaylandVsyncSourceCallbackHandler}; + +static void NativeLayerRootWaylandVsyncCallback(void* aData, uint32_t aTime) { + RefPtr context = static_cast<WaylandVsyncSource*>(aData); + context->FrameCallback(nullptr, aTime); +} + +static float GetFPS(TimeDuration aVsyncRate) { + return 1000.0f / float(aVsyncRate.ToMilliseconds()); +} + +static nsTArray<WaylandVsyncSource*> gWaylandVsyncSources; + +Maybe<TimeDuration> WaylandVsyncSource::GetFastestVsyncRate() { + Maybe<TimeDuration> retVal; + for (auto* source : gWaylandVsyncSources) { + auto rate = source->GetVsyncRateIfEnabled(); + if (!rate) { + continue; + } + if (!retVal.isSome()) { + retVal.emplace(*rate); + } else if (*rate < *retVal) { + retVal.ref() = *rate; + } + } + + return retVal; +} + +WaylandVsyncSource::WaylandVsyncSource(nsWindow* aWindow) + : mMutex("WaylandVsyncSource"), + mVsyncRate(TimeDuration::FromMilliseconds(1000.0 / 60.0)), + mLastVsyncTimeStamp(TimeStamp::Now()), + mWindow(aWindow), + mIdleTimeout(1000 / StaticPrefs::layout_throttled_frame_rate()) { + MOZ_ASSERT(NS_IsMainThread()); + gWaylandVsyncSources.AppendElement(this); +} + +WaylandVsyncSource::~WaylandVsyncSource() { + gWaylandVsyncSources.RemoveElement(this); +} + +void WaylandVsyncSource::MaybeUpdateSource(MozContainer* aContainer) { + MutexAutoLock lock(mMutex); + + LOG("WaylandVsyncSource::MaybeUpdateSource fps %f", GetFPS(mVsyncRate)); + + if (aContainer == mContainer) { + LOG(" mContainer is the same, quit."); + return; + } + + mNativeLayerRoot = nullptr; + mContainer = aContainer; + + if (mMonitorEnabled) { + LOG(" monitor enabled, ask for Refresh()"); + mCallbackRequested = false; + Refresh(lock); + } +} + +void WaylandVsyncSource::MaybeUpdateSource( + const RefPtr<NativeLayerRootWayland>& aNativeLayerRoot) { + MutexAutoLock lock(mMutex); + + LOG("WaylandVsyncSource::MaybeUpdateSource aNativeLayerRoot fps %f", + GetFPS(mVsyncRate)); + + if (aNativeLayerRoot == mNativeLayerRoot) { + LOG(" mNativeLayerRoot is the same, quit."); + return; + } + + mNativeLayerRoot = aNativeLayerRoot; + mContainer = nullptr; + + if (mMonitorEnabled) { + LOG(" monitor enabled, ask for Refresh()"); + mCallbackRequested = false; + Refresh(lock); + } +} + +void WaylandVsyncSource::Refresh(const MutexAutoLock& aProofOfLock) { + mMutex.AssertCurrentThreadOwns(); + + LOG("WaylandVsyncSource::Refresh fps %f\n", GetFPS(mVsyncRate)); + + if (!(mContainer || mNativeLayerRoot) || !mMonitorEnabled || !mVsyncEnabled || + mCallbackRequested) { + // We don't need to do anything because: + // * We are unwanted by our widget or monitor, or + // * The last frame callback hasn't yet run to see that it had been shut + // down, so we can reuse it after having set mVsyncEnabled to true. + LOG(" quit mContainer %d mNativeLayerRoot %d mMonitorEnabled %d " + "mVsyncEnabled %d mCallbackRequested %d", + !!mContainer, !!mNativeLayerRoot, mMonitorEnabled, mVsyncEnabled, + !!mCallbackRequested); + return; + } + + if (mContainer) { + MozContainerSurfaceLock lock(mContainer); + struct wl_surface* surface = lock.GetSurface(); + LOG(" refresh from mContainer, wl_surface %p", surface); + if (!surface) { + LOG(" we're missing wl_surface, register Refresh() callback"); + // The surface hasn't been created yet. Try again when the surface is + // ready. + RefPtr<WaylandVsyncSource> self(this); + moz_container_wayland_add_initial_draw_callback_locked( + mContainer, [self]() -> void { + MutexAutoLock lock(self->mMutex); + self->Refresh(lock); + }); + return; + } + } + + // Vsync is enabled, but we don't have a callback configured. Set one up so + // we can get to work. + SetupFrameCallback(aProofOfLock); + const TimeStamp lastVSync = TimeStamp::Now(); + mLastVsyncTimeStamp = lastVSync; + TimeStamp outputTimestamp = mLastVsyncTimeStamp + mVsyncRate; + + { + MutexAutoUnlock unlock(mMutex); + NotifyVsync(lastVSync, outputTimestamp); + } +} + +void WaylandVsyncSource::EnableMonitor() { + LOG("WaylandVsyncSource::EnableMonitor"); + MutexAutoLock lock(mMutex); + if (mMonitorEnabled) { + return; + } + mMonitorEnabled = true; + Refresh(lock); +} + +void WaylandVsyncSource::DisableMonitor() { + LOG("WaylandVsyncSource::DisableMonitor"); + MutexAutoLock lock(mMutex); + if (!mMonitorEnabled) { + return; + } + mMonitorEnabled = false; + mCallbackRequested = false; +} + +void WaylandVsyncSource::SetupFrameCallback(const MutexAutoLock& aProofOfLock) { + mMutex.AssertCurrentThreadOwns(); + MOZ_ASSERT(!mCallbackRequested); + + LOG("WaylandVsyncSource::SetupFrameCallback"); + + if (mNativeLayerRoot) { + LOG(" use mNativeLayerRoot"); + mNativeLayerRoot->RequestFrameCallback(&NativeLayerRootWaylandVsyncCallback, + this); + } else { + MozContainerSurfaceLock lock(mContainer); + struct wl_surface* surface = lock.GetSurface(); + LOG(" use mContainer, wl_surface %p", surface); + if (!surface) { + // We don't have a surface, either due to being called before it was made + // available in the mozcontainer, or after it was destroyed. We're all + // done regardless. + LOG(" missing wl_surface, quit."); + return; + } + + LOG(" register frame callback"); + MozClearPointer(mCallback, wl_callback_destroy); + mCallback = wl_surface_frame(surface); + wl_callback_add_listener(mCallback, &WaylandVsyncSourceCallbackListener, + this); + wl_surface_commit(surface); + wl_display_flush(WaylandDisplayGet()->GetDisplay()); + + if (!mIdleTimerID) { + mIdleTimerID = g_timeout_add( + mIdleTimeout, + [](void* data) -> gint { + RefPtr vsync = static_cast<WaylandVsyncSource*>(data); + if (vsync->IdleCallback()) { + // We want to fire again, so don't clear mIdleTimerID + return G_SOURCE_CONTINUE; + } + // No need for g_source_remove, caller does it for us. + vsync->mIdleTimerID = 0; + return G_SOURCE_REMOVE; + }, + this); + } + } + + mCallbackRequested = true; +} + +bool WaylandVsyncSource::IdleCallback() { + LOG("WaylandVsyncSource::IdleCallback"); + MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread()); + + RefPtr<nsWindow> window; + TimeStamp lastVSync; + TimeStamp outputTimestamp; + { + MutexAutoLock lock(mMutex); + + if (!mVsyncEnabled || !mMonitorEnabled) { + // We are unwanted by either our creator or our consumer, so we just stop + // here without setting up a new frame callback. + LOG(" quit, mVsyncEnabled %d mMonitorEnabled %d", mVsyncEnabled, + mMonitorEnabled); + return false; + } + + const auto now = TimeStamp::Now(); + const auto timeSinceLastVSync = now - mLastVsyncTimeStamp; + if (timeSinceLastVSync.ToMilliseconds() < mIdleTimeout) { + // We're not idle, we want to fire the timer again. + return true; + } + + LOG(" fire idle vsync"); + CalculateVsyncRate(lock, now); + mLastVsyncTimeStamp = lastVSync = now; + + outputTimestamp = mLastVsyncTimeStamp + mVsyncRate; + window = mWindow; + } + + // This could disable vsync. + window->NotifyOcclusionState(OcclusionState::OCCLUDED); + + if (window->IsDestroyed()) { + return false; + } + // Make sure to fire vsync now even if we get disabled afterwards. + // This gives an opportunity to clean up after the visibility state change. + // FIXME: Do we really need to do this? + NotifyVsync(lastVSync, outputTimestamp); + return StaticPrefs::widget_wayland_vsync_keep_firing_at_idle(); +} + +void WaylandVsyncSource::FrameCallback(wl_callback* aCallback, uint32_t aTime) { + LOG("WaylandVsyncSource::FrameCallback"); + MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread()); + + { + // This might enable vsync. + RefPtr window = mWindow; + window->NotifyOcclusionState(OcclusionState::VISIBLE); + // NotifyOcclusionState can destroy us. + if (window->IsDestroyed()) { + return; + } + } + + MutexAutoLock lock(mMutex); + mCallbackRequested = false; + + // NotifyOcclusionState() can clear and create new mCallback by + // EnableVsync()/Refresh(). So don't delete newly created frame callback. + if (aCallback && aCallback == mCallback) { + MozClearPointer(mCallback, wl_callback_destroy); + } + + if (!mVsyncEnabled || !mMonitorEnabled) { + // We are unwanted by either our creator or our consumer, so we just stop + // here without setting up a new frame callback. + LOG(" quit, mVsyncEnabled %d mMonitorEnabled %d", mVsyncEnabled, + mMonitorEnabled); + return; + } + + // Configure our next frame callback. + SetupFrameCallback(lock); + + int64_t tick = BaseTimeDurationPlatformUtils::TicksFromMilliseconds(aTime); + const auto callbackTimeStamp = TimeStamp::FromSystemTime(tick); + const auto now = TimeStamp::Now(); + + // If the callback timestamp is close enough to our timestamp, use it, + // otherwise use the current time. + const TimeStamp& vsyncTimestamp = + std::abs((now - callbackTimeStamp).ToMilliseconds()) < 50.0 + ? callbackTimeStamp + : now; + + CalculateVsyncRate(lock, vsyncTimestamp); + mLastVsyncTimeStamp = vsyncTimestamp; + const TimeStamp outputTimestamp = vsyncTimestamp + mVsyncRate; + + { + MutexAutoUnlock unlock(mMutex); + NotifyVsync(vsyncTimestamp, outputTimestamp); + } +} + +TimeDuration WaylandVsyncSource::GetVsyncRate() { + MutexAutoLock lock(mMutex); + return mVsyncRate; +} + +Maybe<TimeDuration> WaylandVsyncSource::GetVsyncRateIfEnabled() { + MutexAutoLock lock(mMutex); + if (!mVsyncEnabled) { + return Nothing(); + } + return Some(mVsyncRate); +} + +void WaylandVsyncSource::CalculateVsyncRate(const MutexAutoLock& aProofOfLock, + TimeStamp aVsyncTimestamp) { + mMutex.AssertCurrentThreadOwns(); + + double duration = (aVsyncTimestamp - mLastVsyncTimeStamp).ToMilliseconds(); + double curVsyncRate = mVsyncRate.ToMilliseconds(); + + LOG("WaylandVsyncSource::CalculateVsyncRate start fps %f\n", + GetFPS(mVsyncRate)); + + double correction; + if (duration > curVsyncRate) { + correction = fmin(curVsyncRate, (duration - curVsyncRate) / 10); + mVsyncRate += TimeDuration::FromMilliseconds(correction); + } else { + correction = fmin(curVsyncRate / 2, (curVsyncRate - duration) / 10); + mVsyncRate -= TimeDuration::FromMilliseconds(correction); + } + + LOG(" new fps %f correction %f\n", GetFPS(mVsyncRate), correction); +} + +void WaylandVsyncSource::EnableVsync() { + MOZ_ASSERT(NS_IsMainThread()); + + MutexAutoLock lock(mMutex); + + LOG("WaylandVsyncSource::EnableVsync fps %f\n", GetFPS(mVsyncRate)); + if (mVsyncEnabled || mIsShutdown) { + LOG(" early quit"); + return; + } + mVsyncEnabled = true; + Refresh(lock); +} + +void WaylandVsyncSource::DisableVsync() { + MutexAutoLock lock(mMutex); + + LOG("WaylandVsyncSource::DisableVsync fps %f\n", GetFPS(mVsyncRate)); + mVsyncEnabled = false; + mCallbackRequested = false; +} + +bool WaylandVsyncSource::IsVsyncEnabled() { + MutexAutoLock lock(mMutex); + return mVsyncEnabled; +} + +void WaylandVsyncSource::Shutdown() { + MOZ_ASSERT(NS_IsMainThread()); + MutexAutoLock lock(mMutex); + + LOG("WaylandVsyncSource::Shutdown fps %f\n", GetFPS(mVsyncRate)); + mContainer = nullptr; + mNativeLayerRoot = nullptr; + mIsShutdown = true; + mVsyncEnabled = false; + mCallbackRequested = false; + MozClearHandleID(mIdleTimerID, g_source_remove); + MozClearPointer(mCallback, wl_callback_destroy); +} + +} // namespace mozilla + +#endif // MOZ_WAYLAND |