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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "ui/gl/sync_control_vsync_provider.h" | 5 #include "ui/gl/sync_control_vsync_provider.h" |
6 | 6 |
7 #include <math.h> | 7 #include <math.h> |
8 | 8 |
9 #include "base/logging.h" | 9 #include "base/logging.h" |
10 #include "base/time/time.h" | 10 #include "base/time/time.h" |
11 #include "base/trace_event/trace_event.h" | 11 #include "base/trace_event/trace_event.h" |
12 #include "build/build_config.h" | 12 #include "build/build_config.h" |
13 | 13 |
14 #if defined(OS_LINUX) || defined(OS_WIN) | 14 #if defined(OS_LINUX) |
15 // These constants define a reasonable range for a calculated refresh interval. | 15 // These constants define a reasonable range for a calculated refresh interval. |
16 // Calculating refreshes out of this range will be considered a fatal error. | 16 // Calculating refreshes out of this range will be considered a fatal error. |
17 const int64_t kMinVsyncIntervalUs = base::Time::kMicrosecondsPerSecond / 400; | 17 const int64_t kMinVsyncIntervalUs = base::Time::kMicrosecondsPerSecond / 400; |
18 const int64_t kMaxVsyncIntervalUs = base::Time::kMicrosecondsPerSecond / 10; | 18 const int64_t kMaxVsyncIntervalUs = base::Time::kMicrosecondsPerSecond / 10; |
19 | 19 |
20 // How much noise we'll tolerate between successive computed intervals before | 20 // How much noise we'll tolerate between successive computed intervals before |
21 // we think the latest computed interval is invalid (noisey due to | 21 // we think the latest computed interval is invalid (noisey due to |
22 // monitor configuration change, moving a window between monitors, etc.). | 22 // monitor configuration change, moving a window between monitors, etc.). |
23 const double kRelativeIntervalDifferenceThreshold = 0.05; | 23 const double kRelativeIntervalDifferenceThreshold = 0.05; |
24 #endif // defined(OS_LINUX) || defined(OS_WIN) | 24 #endif |
25 | 25 |
26 namespace gl { | 26 namespace gl { |
27 | 27 |
28 SyncControlVSyncProvider::SyncControlVSyncProvider() : gfx::VSyncProvider() { | 28 SyncControlVSyncProvider::SyncControlVSyncProvider() : gfx::VSyncProvider() { |
29 #if defined(OS_LINUX) || defined(OS_WIN) | 29 #if defined(OS_LINUX) |
30 // On platforms where we can't get an accurate reading on the refresh | 30 // On platforms where we can't get an accurate reading on the refresh |
31 // rate we fall back to the assumption that we're displaying 60 frames | 31 // rate we fall back to the assumption that we're displaying 60 frames |
32 // per second. | 32 // per second. |
33 last_good_interval_ = base::TimeDelta::FromSeconds(1) / 60; | 33 last_good_interval_ = base::TimeDelta::FromSeconds(1) / 60; |
34 #endif // defined(OS_LINUX) || defined(OS_WIN) | 34 #endif |
35 } | 35 } |
36 | 36 |
37 SyncControlVSyncProvider::~SyncControlVSyncProvider() {} | 37 SyncControlVSyncProvider::~SyncControlVSyncProvider() {} |
38 | 38 |
39 void SyncControlVSyncProvider::GetVSyncParameters( | 39 void SyncControlVSyncProvider::GetVSyncParameters( |
40 const UpdateVSyncCallback& callback) { | 40 const UpdateVSyncCallback& callback) { |
41 TRACE_EVENT0("gpu", "SyncControlVSyncProvider::GetVSyncParameters"); | 41 TRACE_EVENT0("gpu", "SyncControlVSyncProvider::GetVSyncParameters"); |
42 #if defined(OS_LINUX) || defined(OS_WIN) | 42 #if defined(OS_LINUX) |
43 base::TimeTicks timebase; | 43 base::TimeTicks timebase; |
44 | 44 |
45 int64_t system_time; | |
46 int64_t media_stream_counter; | |
47 int64_t swap_buffer_counter; | |
48 if (!GetSyncValues(&system_time, &media_stream_counter, &swap_buffer_counter)) | |
49 return; | |
50 | |
51 if (media_stream_counter == last_media_stream_counter_) { | |
52 // SyncValues haven't updated, there is no reason to invoke the callback. | |
53 return; | |
54 } | |
55 | |
56 // Perform platform specific adjustment of |system_time| and | |
57 // |media_stream_counter|. | |
58 if (!AdjustSyncValues(&system_time, &media_stream_counter)) | |
59 return; | |
60 | |
61 timebase = base::TimeTicks::FromInternalValue(system_time); | |
62 | |
63 // Only need the previous calculated interval for our filtering. | |
64 while (last_computed_intervals_.size() > 1) | |
65 last_computed_intervals_.pop(); | |
66 | |
67 base::TimeDelta timebase_diff; | |
68 int64_t counter_diff = 0; | |
69 | |
70 int32_t numerator, denominator; | |
71 if (GetMscRate(&numerator, &denominator) && numerator) { | |
72 timebase_diff = base::TimeDelta::FromSeconds(denominator); | |
73 counter_diff = numerator; | |
74 } else if (!last_timebase_.is_null()) { | |
75 timebase_diff = timebase - last_timebase_; | |
76 counter_diff = media_stream_counter - last_media_stream_counter_; | |
77 } | |
78 | |
79 if (counter_diff > 0 && timebase_diff > base::TimeDelta()) { | |
80 last_computed_intervals_.push(timebase_diff / counter_diff); | |
81 | |
82 if (last_computed_intervals_.size() == 2) { | |
83 const base::TimeDelta& old_interval = last_computed_intervals_.front(); | |
84 const base::TimeDelta& new_interval = last_computed_intervals_.back(); | |
85 | |
86 double relative_change = fabs(old_interval.InMillisecondsF() - | |
87 new_interval.InMillisecondsF()) / | |
88 new_interval.InMillisecondsF(); | |
89 if (relative_change < kRelativeIntervalDifferenceThreshold) { | |
90 if (new_interval.InMicroseconds() < kMinVsyncIntervalUs || | |
91 new_interval.InMicroseconds() > kMaxVsyncIntervalUs) { | |
92 #if defined(OS_WIN) || defined(USE_ASH) | |
93 // On ash platforms (ChromeOS essentially), the real refresh interval | |
94 // is queried from XRandR, regardless of the value calculated here, | |
95 // and this value is overriden by ui::CompositorVSyncManager. The log | |
96 // should not be fatal in this case. Reconsider all this when XRandR | |
97 // support is added to non-ash platforms. | |
98 // http://crbug.com/340851 | |
99 // On Windows |system_time| is based on QPC and it seems it may | |
100 // produce invalid value after a suspend/resume cycle. | |
101 // http://crbug.com/656469 | |
102 LOG(ERROR) | |
103 #else | |
104 LOG(FATAL) | |
105 #endif // OS_WIN || USE_ASH | |
106 << "Calculated bogus refresh interval=" | |
107 << new_interval.InMicroseconds() | |
108 << " us, old_interval=" << old_interval.InMicroseconds() | |
109 << " us, last_timebase_=" << last_timebase_.ToInternalValue() | |
110 << " us, timebase=" << timebase.ToInternalValue() | |
111 << " us, timebase_diff=" << timebase_diff.ToInternalValue() | |
112 << " us, last_timebase_diff_=" | |
113 << last_timebase_diff_.ToInternalValue() | |
114 << " us, last_media_stream_counter_=" | |
115 << last_media_stream_counter_ | |
116 << ", media_stream_counter=" << media_stream_counter | |
117 << ", counter_diff=" << counter_diff | |
118 << ", last_counter_diff_=" << last_counter_diff_; | |
119 } else { | |
120 last_good_interval_ = new_interval; | |
121 } | |
122 } | |
123 } | |
124 | |
125 last_timebase_diff_ = timebase_diff; | |
126 last_counter_diff_ = counter_diff; | |
127 } | |
128 | |
129 last_timebase_ = timebase; | |
130 last_media_stream_counter_ = media_stream_counter; | |
131 callback.Run(timebase, last_good_interval_); | |
132 #endif // defined(OS_LINUX) || defined(OS_WIN) | |
133 } | |
134 | |
135 #if defined(OS_LINUX) | |
136 bool SyncControlVSyncProvider::AdjustSyncValues(int64_t* system_time, | |
137 int64_t* media_stream_counter) { | |
138 // Both Intel and Mali drivers will return TRUE for GetSyncValues | |
139 // but a value of 0 for MSC if they cannot access the CRTC data structure | |
140 // associated with the surface. crbug.com/231945 | |
141 bool prev_invalid_msc = invalid_msc_; | |
142 invalid_msc_ = (*media_stream_counter == 0); | |
143 if (invalid_msc_) { | |
144 LOG_IF(ERROR, !prev_invalid_msc) | |
145 << "glXGetSyncValuesOML " | |
146 "should not return TRUE with a media stream counter of 0."; | |
147 return false; | |
148 } | |
149 | |
150 // The actual clock used for the system time returned by glXGetSyncValuesOML | 45 // The actual clock used for the system time returned by glXGetSyncValuesOML |
151 // is unspecified. In practice, the clock used is likely to be either | 46 // is unspecified. In practice, the clock used is likely to be either |
152 // CLOCK_REALTIME or CLOCK_MONOTONIC, so we compare the returned time to the | 47 // CLOCK_REALTIME or CLOCK_MONOTONIC, so we compare the returned time to the |
153 // current time according to both clocks, and assume that the returned time | 48 // current time according to both clocks, and assume that the returned time |
154 // was produced by the clock whose current time is closest to it, subject | 49 // was produced by the clock whose current time is closest to it, subject |
155 // to the restriction that the returned time must not be in the future | 50 // to the restriction that the returned time must not be in the future |
156 // (since it is the time of a vblank that has already occurred). | 51 // (since it is the time of a vblank that has already occurred). |
| 52 int64_t system_time; |
| 53 int64_t media_stream_counter; |
| 54 int64_t swap_buffer_counter; |
| 55 if (!GetSyncValues(&system_time, &media_stream_counter, &swap_buffer_counter)) |
| 56 return; |
| 57 |
| 58 // Both Intel and Mali drivers will return TRUE for GetSyncValues |
| 59 // but a value of 0 for MSC if they cannot access the CRTC data structure |
| 60 // associated with the surface. crbug.com/231945 |
| 61 bool prev_invalid_msc = invalid_msc_; |
| 62 invalid_msc_ = (media_stream_counter == 0); |
| 63 if (invalid_msc_) { |
| 64 LOG_IF(ERROR, !prev_invalid_msc) << "glXGetSyncValuesOML " |
| 65 "should not return TRUE with a media stream counter of 0."; |
| 66 return; |
| 67 } |
| 68 |
157 struct timespec real_time; | 69 struct timespec real_time; |
158 struct timespec monotonic_time; | 70 struct timespec monotonic_time; |
159 clock_gettime(CLOCK_REALTIME, &real_time); | 71 clock_gettime(CLOCK_REALTIME, &real_time); |
160 clock_gettime(CLOCK_MONOTONIC, &monotonic_time); | 72 clock_gettime(CLOCK_MONOTONIC, &monotonic_time); |
161 | 73 |
162 int64_t real_time_in_microseconds = | 74 int64_t real_time_in_microseconds = |
163 real_time.tv_sec * base::Time::kMicrosecondsPerSecond + | 75 real_time.tv_sec * base::Time::kMicrosecondsPerSecond + |
164 real_time.tv_nsec / base::Time::kNanosecondsPerMicrosecond; | 76 real_time.tv_nsec / base::Time::kNanosecondsPerMicrosecond; |
165 int64_t monotonic_time_in_microseconds = | 77 int64_t monotonic_time_in_microseconds = |
166 monotonic_time.tv_sec * base::Time::kMicrosecondsPerSecond + | 78 monotonic_time.tv_sec * base::Time::kMicrosecondsPerSecond + |
167 monotonic_time.tv_nsec / base::Time::kNanosecondsPerMicrosecond; | 79 monotonic_time.tv_nsec / base::Time::kNanosecondsPerMicrosecond; |
168 | 80 |
169 // We need the time according to CLOCK_MONOTONIC, so if we've been given | 81 // We need the time according to CLOCK_MONOTONIC, so if we've been given |
170 // a time from CLOCK_REALTIME, we need to convert. | 82 // a time from CLOCK_REALTIME, we need to convert. |
171 bool time_conversion_needed = | 83 bool time_conversion_needed = |
172 llabs(*system_time - real_time_in_microseconds) < | 84 llabs(system_time - real_time_in_microseconds) < |
173 llabs(*system_time - monotonic_time_in_microseconds); | 85 llabs(system_time - monotonic_time_in_microseconds); |
174 | 86 |
175 if (time_conversion_needed) | 87 if (time_conversion_needed) |
176 *system_time += monotonic_time_in_microseconds - real_time_in_microseconds; | 88 system_time += monotonic_time_in_microseconds - real_time_in_microseconds; |
177 | 89 |
178 // Return if |*system_time| is more than 1 frames in the future. | 90 // Return if |system_time| is more than 1 frames in the future. |
179 int64_t interval_in_microseconds = last_good_interval_.InMicroseconds(); | 91 int64_t interval_in_microseconds = last_good_interval_.InMicroseconds(); |
180 if (*system_time > monotonic_time_in_microseconds + interval_in_microseconds) | 92 if (system_time > monotonic_time_in_microseconds + interval_in_microseconds) |
181 return false; | 93 return; |
182 | 94 |
183 // If |system_time| is slightly in the future, adjust it to the previous | 95 // If |system_time| is slightly in the future, adjust it to the previous |
184 // frame and use the last frame counter to prevent issues in the callback. | 96 // frame and use the last frame counter to prevent issues in the callback. |
185 if (*system_time > monotonic_time_in_microseconds) { | 97 if (system_time > monotonic_time_in_microseconds) { |
186 *system_time -= interval_in_microseconds; | 98 system_time -= interval_in_microseconds; |
187 (*media_stream_counter)--; | 99 media_stream_counter--; |
188 } | 100 } |
189 if (monotonic_time_in_microseconds - *system_time > | 101 if (monotonic_time_in_microseconds - system_time > |
190 base::Time::kMicrosecondsPerSecond) | 102 base::Time::kMicrosecondsPerSecond) |
191 return false; | 103 return; |
192 | 104 |
193 return true; | 105 timebase = base::TimeTicks::FromInternalValue(system_time); |
| 106 |
| 107 // Only need the previous calculated interval for our filtering. |
| 108 while (last_computed_intervals_.size() > 1) |
| 109 last_computed_intervals_.pop(); |
| 110 |
| 111 int32_t numerator, denominator; |
| 112 if (GetMscRate(&numerator, &denominator) && numerator) { |
| 113 last_computed_intervals_.push(base::TimeDelta::FromSeconds(denominator) / |
| 114 numerator); |
| 115 } else if (!last_timebase_.is_null()) { |
| 116 base::TimeDelta timebase_diff = timebase - last_timebase_; |
| 117 int64_t counter_diff = media_stream_counter - last_media_stream_counter_; |
| 118 if (counter_diff > 0 && timebase > last_timebase_) |
| 119 last_computed_intervals_.push(timebase_diff / counter_diff); |
| 120 } |
| 121 |
| 122 if (last_computed_intervals_.size() == 2) { |
| 123 const base::TimeDelta& old_interval = last_computed_intervals_.front(); |
| 124 const base::TimeDelta& new_interval = last_computed_intervals_.back(); |
| 125 |
| 126 double relative_change = |
| 127 fabs(old_interval.InMillisecondsF() - new_interval.InMillisecondsF()) / |
| 128 new_interval.InMillisecondsF(); |
| 129 if (relative_change < kRelativeIntervalDifferenceThreshold) { |
| 130 if (new_interval.InMicroseconds() < kMinVsyncIntervalUs || |
| 131 new_interval.InMicroseconds() > kMaxVsyncIntervalUs) { |
| 132 #if defined(USE_ASH) |
| 133 // On ash platforms (ChromeOS essentially), the real refresh interval is |
| 134 // queried from XRandR, regardless of the value calculated here, and |
| 135 // this value is overriden by ui::CompositorVSyncManager. The log |
| 136 // should not be fatal in this case. Reconsider all this when XRandR |
| 137 // support is added to non-ash platforms. |
| 138 // http://crbug.com/340851 |
| 139 LOG(ERROR) |
| 140 #else |
| 141 LOG(FATAL) |
| 142 #endif // USE_ASH |
| 143 << "Calculated bogus refresh interval=" |
| 144 << new_interval.InMicroseconds() |
| 145 << " us., last_timebase_=" << last_timebase_.ToInternalValue() |
| 146 << " us., timebase=" << timebase.ToInternalValue() |
| 147 << " us., last_media_stream_counter_=" << last_media_stream_counter_ |
| 148 << ", media_stream_counter=" << media_stream_counter; |
| 149 } else { |
| 150 last_good_interval_ = new_interval; |
| 151 } |
| 152 } |
| 153 } |
| 154 |
| 155 last_timebase_ = timebase; |
| 156 last_media_stream_counter_ = media_stream_counter; |
| 157 callback.Run(timebase, last_good_interval_); |
| 158 #endif // defined(OS_LINUX) |
194 } | 159 } |
195 #endif // defined(OS_LINUX) | |
196 | |
197 #if defined(OS_WIN) | |
198 bool SyncControlVSyncProvider::AdjustSyncValues(int64_t* system_time, | |
199 int64_t* media_stream_counter) { | |
200 // Zero MSC is returned once when switching between windowed and full screen | |
201 // modes. | |
202 if (*media_stream_counter == 0) | |
203 return false; | |
204 | |
205 // The actual clock used for the system time returned by glXGetSyncValuesEGL | |
206 // is unspecified. In practice, the clock comes from QueryPerformanceCounter. | |
207 LARGE_INTEGER perf_counter_now = {}; | |
208 ::QueryPerformanceCounter(&perf_counter_now); | |
209 int64_t qpc_now = | |
210 base::TimeDelta::FromQPCValue(perf_counter_now.QuadPart).InMicroseconds(); | |
211 | |
212 // Return if |system_time| is more than 1 frames in the future. | |
213 int64_t interval_in_microseconds = last_good_interval_.InMicroseconds(); | |
214 if (*system_time > qpc_now + interval_in_microseconds) | |
215 return false; | |
216 | |
217 // If |system_time| is slightly in the future, adjust it to the previous | |
218 // frame and use the last frame counter to prevent issues in the callback. | |
219 if (*system_time > qpc_now) { | |
220 *system_time -= interval_in_microseconds; | |
221 (*media_stream_counter)--; | |
222 } | |
223 if (qpc_now - *system_time > base::Time::kMicrosecondsPerSecond) | |
224 return false; | |
225 | |
226 return true; | |
227 } | |
228 #endif // defined(OS_WIN) | |
229 | 160 |
230 } // namespace gl | 161 } // namespace gl |
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