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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <d3d11.h>
#include <windows.h>
#include <wrl/client.h>
#include "base/threading/thread.h"
#include "ui/gl/gl_export.h"
namespace gl {
// Helper class that manages a thread for calling IDXGIOutput::WaitForVBlank()
// for the output corresponding to the given |window|, and runs |callback| on
// the same thread. The callback can be enabled or disabled via SetEnabled().
// This is used by DirectCompositionSurfaceWin to plumb vsync signal back to the
// display compositor's BeginFrameSource.
class GL_EXPORT VSyncThreadWin {
using VSyncCallback =
base::RepeatingCallback<void(base::TimeTicks, base::TimeDelta)>;
VSyncThreadWin(HWND window,
Microsoft::WRL::ComPtr<ID3D11Device> d3d11_device,
VSyncCallback callback);
void SetEnabled(bool enabled);
void WaitForVSync();
base::Thread vsync_thread_;
// Used on vsync thread only after initialization.
const HWND window_;
const Microsoft::WRL::ComPtr<ID3D11Device> d3d11_device_;
const VSyncCallback callback_;
// Used on vsync thread exclusively.
HMONITOR window_monitor_ = nullptr;
Microsoft::WRL::ComPtr<IDXGIOutput> window_output_;
base::Lock lock_;
bool GUARDED_BY(lock_) enabled_ = false;
bool GUARDED_BY(lock_) started_ = false;
} // namespace gl