blob: e3d65f122c25083c8fb666e5f24c1c7399a51d82 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
// 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.
#ifndef UI_GL_VSYNC_THREAD_WIN_H_
#define UI_GL_VSYNC_THREAD_WIN_H_
#include <d3d11.h>
#include <windows.h>
#include <wrl/client.h>
#include "base/containers/flat_set.h"
#include "base/threading/thread.h"
#include "ui/gl/gl_export.h"
#include "ui/gl/vsync_provider_win.h"
namespace base {
template <typename T>
struct DefaultSingletonTraits;
} // namespace base
namespace gl {
class VSyncObserver;
// Helper singleton that wraps a thread for calling IDXGIOutput::WaitForVBlank()
// for the primary monitor, and notifies observers on the same thread. Observers
// can be added or removed on the main thread, and the vsync thread goes to
// sleep if there are no observers. This is used by DirectCompositionSurfaceWin
// to plumb vsync signal back to the display compositor's BeginFrameSource.
class GL_EXPORT VSyncThreadWin {
public:
static VSyncThreadWin* GetInstance();
// These methods are not rentrancy safe, and shouldn't be called inside
// VSyncObserver::OnVSync. It's safe to assume that these can be called only
// from the main thread.
void AddObserver(VSyncObserver* obs);
void RemoveObserver(VSyncObserver* obs);
private:
friend struct base::DefaultSingletonTraits<VSyncThreadWin>;
VSyncThreadWin();
~VSyncThreadWin();
void WaitForVSync();
base::Thread vsync_thread_;
// Used on vsync thread only after initialization.
VSyncProviderWin vsync_provider_;
const Microsoft::WRL::ComPtr<ID3D11Device> d3d11_device_;
HMONITOR primary_monitor_ = nullptr;
Microsoft::WRL::ComPtr<IDXGIOutput> primary_output_;
base::Lock lock_;
bool GUARDED_BY(lock_) is_idle_ = true;
base::flat_set<VSyncObserver*> GUARDED_BY(lock_) observers_;
DISALLOW_COPY_AND_ASSIGN(VSyncThreadWin);
};
} // namespace gl
#endif // UI_GL_VSYNC_THREAD_WIN_H_
|
