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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GL_VSYNC_THREAD_WIN_H_
#define UI_GL_VSYNC_THREAD_WIN_H_
#include <windows.h>
#include <d3d11.h>
#include <wrl/client.h>
#include "base/containers/flat_set.h"
#include "base/memory/raw_ptr.h"
#include "base/observer_list.h"
#include "base/observer_list_types.h"
#include "base/power_monitor/power_observer.h"
#include "base/threading/thread.h"
#include "ui/gl/gl_export.h"
#include "ui/gl/vsync_provider_win.h"
namespace gl {
// Helper singleton that wraps a thread which calls IDXGIOutput::WaitForVBlank()
// for the primary monitor and notifies observers. Observers can be added or
// removed from any thread. The vsync thread sleeps when there are no observers.
// This is used by ExternalBeginFrameSourceWin.
class GL_EXPORT VSyncThreadWin : public base::PowerSuspendObserver {
public:
static VSyncThreadWin* GetInstance();
VSyncThreadWin(const VSyncThreadWin&) = delete;
VSyncThreadWin& operator=(const VSyncThreadWin&) = delete;
// Implementation of base::PowerSuspendObserver
void OnSuspend() final;
void OnResume() final;
class GL_EXPORT VSyncObserver : public base::CheckedObserver {
public:
// Called on vsync thread.
virtual void OnVSync(base::TimeTicks vsync_time,
base::TimeDelta interval) = 0;
protected:
~VSyncObserver() override = default;
};
// These methods can be called from anywhere, including from inside an
// OnVSync() notification.
void AddObserver(VSyncObserver* obs);
void RemoveObserver(VSyncObserver* obs);
virtual gfx::VSyncProvider* vsync_provider() = 0;
// Returns the vsync interval via the Vsync provider.
virtual base::TimeDelta GetVsyncInterval() = 0;
protected:
VSyncThreadWin();
~VSyncThreadWin() override;
// Gets vsync interval from vsync_provider and halts thread until the next
// signal from the compositor clock or vblank. Returns true if the wait was
// completed successfully, early if the desktop was occluded and false on any
// other failures.
virtual bool WaitForVSyncImpl(base::TimeDelta* vsync_interval) = 0;
private:
// Acquires `lock_` in a scope if not already held by the thread.
class SCOPED_LOCKABLE AutoVSyncThreadLock;
void WaitForVSync();
void PostTaskIfNeeded() EXCLUSIVE_LOCKS_REQUIRED(lock_);
base::Thread vsync_thread_;
base::Lock lock_;
bool GUARDED_BY(lock_) is_vsync_task_posted_ = false;
bool GUARDED_BY(lock_) is_suspended_ = false;
base::ObserverList<VSyncObserver> GUARDED_BY(lock_) observers_;
};
} // namespace gl
#endif // UI_GL_VSYNC_THREAD_WIN_H_
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