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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 | 13 |
| 13 #if defined(OS_LINUX) | 14 #if defined(OS_LINUX) |
| 14 // These constants define a reasonable range for a calculated refresh interval. | 15 // These constants define a reasonable range for a calculated refresh interval. |
| 15 // 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. |
| 16 const int64 kMinVsyncIntervalUs = base::Time::kMicrosecondsPerSecond / 400; | 17 const int64_t kMinVsyncIntervalUs = base::Time::kMicrosecondsPerSecond / 400; |
| 17 const int64 kMaxVsyncIntervalUs = base::Time::kMicrosecondsPerSecond / 10; | 18 const int64_t kMaxVsyncIntervalUs = base::Time::kMicrosecondsPerSecond / 10; |
| 18 | 19 |
| 19 // How much noise we'll tolerate between successive computed intervals before | 20 // How much noise we'll tolerate between successive computed intervals before |
| 20 // we think the latest computed interval is invalid (noisey due to | 21 // we think the latest computed interval is invalid (noisey due to |
| 21 // monitor configuration change, moving a window between monitors, etc.). | 22 // monitor configuration change, moving a window between monitors, etc.). |
| 22 const double kRelativeIntervalDifferenceThreshold = 0.05; | 23 const double kRelativeIntervalDifferenceThreshold = 0.05; |
| 23 #endif | 24 #endif |
| 24 | 25 |
| 25 namespace gfx { | 26 namespace gfx { |
| 26 | 27 |
| 27 SyncControlVSyncProvider::SyncControlVSyncProvider() | 28 SyncControlVSyncProvider::SyncControlVSyncProvider() |
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| 40 #if defined(OS_LINUX) | 41 #if defined(OS_LINUX) |
| 41 base::TimeTicks timebase; | 42 base::TimeTicks timebase; |
| 42 | 43 |
| 43 // The actual clock used for the system time returned by glXGetSyncValuesOML | 44 // The actual clock used for the system time returned by glXGetSyncValuesOML |
| 44 // is unspecified. In practice, the clock used is likely to be either | 45 // is unspecified. In practice, the clock used is likely to be either |
| 45 // CLOCK_REALTIME or CLOCK_MONOTONIC, so we compare the returned time to the | 46 // CLOCK_REALTIME or CLOCK_MONOTONIC, so we compare the returned time to the |
| 46 // current time according to both clocks, and assume that the returned time | 47 // current time according to both clocks, and assume that the returned time |
| 47 // was produced by the clock whose current time is closest to it, subject | 48 // was produced by the clock whose current time is closest to it, subject |
| 48 // to the restriction that the returned time must not be in the future | 49 // to the restriction that the returned time must not be in the future |
| 49 // (since it is the time of a vblank that has already occurred). | 50 // (since it is the time of a vblank that has already occurred). |
| 50 int64 system_time; | 51 int64_t system_time; |
| 51 int64 media_stream_counter; | 52 int64_t media_stream_counter; |
| 52 int64 swap_buffer_counter; | 53 int64_t swap_buffer_counter; |
| 53 if (!GetSyncValues(&system_time, &media_stream_counter, &swap_buffer_counter)) | 54 if (!GetSyncValues(&system_time, &media_stream_counter, &swap_buffer_counter)) |
| 54 return; | 55 return; |
| 55 | 56 |
| 56 // Both Intel and Mali drivers will return TRUE for GetSyncValues | 57 // Both Intel and Mali drivers will return TRUE for GetSyncValues |
| 57 // but a value of 0 for MSC if they cannot access the CRTC data structure | 58 // but a value of 0 for MSC if they cannot access the CRTC data structure |
| 58 // associated with the surface. crbug.com/231945 | 59 // associated with the surface. crbug.com/231945 |
| 59 bool prev_invalid_msc = invalid_msc_; | 60 bool prev_invalid_msc = invalid_msc_; |
| 60 invalid_msc_ = (media_stream_counter == 0); | 61 invalid_msc_ = (media_stream_counter == 0); |
| 61 if (invalid_msc_) { | 62 if (invalid_msc_) { |
| 62 LOG_IF(ERROR, !prev_invalid_msc) << "glXGetSyncValuesOML " | 63 LOG_IF(ERROR, !prev_invalid_msc) << "glXGetSyncValuesOML " |
| 63 "should not return TRUE with a media stream counter of 0."; | 64 "should not return TRUE with a media stream counter of 0."; |
| 64 return; | 65 return; |
| 65 } | 66 } |
| 66 | 67 |
| 67 struct timespec real_time; | 68 struct timespec real_time; |
| 68 struct timespec monotonic_time; | 69 struct timespec monotonic_time; |
| 69 clock_gettime(CLOCK_REALTIME, &real_time); | 70 clock_gettime(CLOCK_REALTIME, &real_time); |
| 70 clock_gettime(CLOCK_MONOTONIC, &monotonic_time); | 71 clock_gettime(CLOCK_MONOTONIC, &monotonic_time); |
| 71 | 72 |
| 72 int64 real_time_in_microseconds = | 73 int64_t real_time_in_microseconds = |
| 73 real_time.tv_sec * base::Time::kMicrosecondsPerSecond + | 74 real_time.tv_sec * base::Time::kMicrosecondsPerSecond + |
| 74 real_time.tv_nsec / base::Time::kNanosecondsPerMicrosecond; | 75 real_time.tv_nsec / base::Time::kNanosecondsPerMicrosecond; |
| 75 int64 monotonic_time_in_microseconds = | 76 int64_t monotonic_time_in_microseconds = |
| 76 monotonic_time.tv_sec * base::Time::kMicrosecondsPerSecond + | 77 monotonic_time.tv_sec * base::Time::kMicrosecondsPerSecond + |
| 77 monotonic_time.tv_nsec / base::Time::kNanosecondsPerMicrosecond; | 78 monotonic_time.tv_nsec / base::Time::kNanosecondsPerMicrosecond; |
| 78 | 79 |
| 79 // We need the time according to CLOCK_MONOTONIC, so if we've been given | 80 // We need the time according to CLOCK_MONOTONIC, so if we've been given |
| 80 // a time from CLOCK_REALTIME, we need to convert. | 81 // a time from CLOCK_REALTIME, we need to convert. |
| 81 bool time_conversion_needed = | 82 bool time_conversion_needed = |
| 82 llabs(system_time - real_time_in_microseconds) < | 83 llabs(system_time - real_time_in_microseconds) < |
| 83 llabs(system_time - monotonic_time_in_microseconds); | 84 llabs(system_time - monotonic_time_in_microseconds); |
| 84 | 85 |
| 85 if (time_conversion_needed) | 86 if (time_conversion_needed) |
| 86 system_time += monotonic_time_in_microseconds - real_time_in_microseconds; | 87 system_time += monotonic_time_in_microseconds - real_time_in_microseconds; |
| 87 | 88 |
| 88 // Return if |system_time| is more than 1 frames in the future. | 89 // Return if |system_time| is more than 1 frames in the future. |
| 89 int64 interval_in_microseconds = last_good_interval_.InMicroseconds(); | 90 int64_t interval_in_microseconds = last_good_interval_.InMicroseconds(); |
| 90 if (system_time > monotonic_time_in_microseconds + interval_in_microseconds) | 91 if (system_time > monotonic_time_in_microseconds + interval_in_microseconds) |
| 91 return; | 92 return; |
| 92 | 93 |
| 93 // If |system_time| is slightly in the future, adjust it to the previous | 94 // If |system_time| is slightly in the future, adjust it to the previous |
| 94 // frame and use the last frame counter to prevent issues in the callback. | 95 // frame and use the last frame counter to prevent issues in the callback. |
| 95 if (system_time > monotonic_time_in_microseconds) { | 96 if (system_time > monotonic_time_in_microseconds) { |
| 96 system_time -= interval_in_microseconds; | 97 system_time -= interval_in_microseconds; |
| 97 media_stream_counter--; | 98 media_stream_counter--; |
| 98 } | 99 } |
| 99 if (monotonic_time_in_microseconds - system_time > | 100 if (monotonic_time_in_microseconds - system_time > |
| 100 base::Time::kMicrosecondsPerSecond) | 101 base::Time::kMicrosecondsPerSecond) |
| 101 return; | 102 return; |
| 102 | 103 |
| 103 timebase = base::TimeTicks::FromInternalValue(system_time); | 104 timebase = base::TimeTicks::FromInternalValue(system_time); |
| 104 | 105 |
| 105 // Only need the previous calculated interval for our filtering. | 106 // Only need the previous calculated interval for our filtering. |
| 106 while (last_computed_intervals_.size() > 1) | 107 while (last_computed_intervals_.size() > 1) |
| 107 last_computed_intervals_.pop(); | 108 last_computed_intervals_.pop(); |
| 108 | 109 |
| 109 int32 numerator, denominator; | 110 int32_t numerator, denominator; |
| 110 if (GetMscRate(&numerator, &denominator)) { | 111 if (GetMscRate(&numerator, &denominator)) { |
| 111 last_computed_intervals_.push(base::TimeDelta::FromSeconds(denominator) / | 112 last_computed_intervals_.push(base::TimeDelta::FromSeconds(denominator) / |
| 112 numerator); | 113 numerator); |
| 113 } else if (!last_timebase_.is_null()) { | 114 } else if (!last_timebase_.is_null()) { |
| 114 base::TimeDelta timebase_diff = timebase - last_timebase_; | 115 base::TimeDelta timebase_diff = timebase - last_timebase_; |
| 115 int64 counter_diff = media_stream_counter - last_media_stream_counter_; | 116 int64_t counter_diff = media_stream_counter - last_media_stream_counter_; |
| 116 if (counter_diff > 0 && timebase > last_timebase_) | 117 if (counter_diff > 0 && timebase > last_timebase_) |
| 117 last_computed_intervals_.push(timebase_diff / counter_diff); | 118 last_computed_intervals_.push(timebase_diff / counter_diff); |
| 118 } | 119 } |
| 119 | 120 |
| 120 if (last_computed_intervals_.size() == 2) { | 121 if (last_computed_intervals_.size() == 2) { |
| 121 const base::TimeDelta& old_interval = last_computed_intervals_.front(); | 122 const base::TimeDelta& old_interval = last_computed_intervals_.front(); |
| 122 const base::TimeDelta& new_interval = last_computed_intervals_.back(); | 123 const base::TimeDelta& new_interval = last_computed_intervals_.back(); |
| 123 | 124 |
| 124 double relative_change = | 125 double relative_change = |
| 125 fabs(old_interval.InMillisecondsF() - new_interval.InMillisecondsF()) / | 126 fabs(old_interval.InMillisecondsF() - new_interval.InMillisecondsF()) / |
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| 150 } | 151 } |
| 151 } | 152 } |
| 152 | 153 |
| 153 last_timebase_ = timebase; | 154 last_timebase_ = timebase; |
| 154 last_media_stream_counter_ = media_stream_counter; | 155 last_media_stream_counter_ = media_stream_counter; |
| 155 callback.Run(timebase, last_good_interval_); | 156 callback.Run(timebase, last_good_interval_); |
| 156 #endif // defined(OS_LINUX) | 157 #endif // defined(OS_LINUX) |
| 157 } | 158 } |
| 158 | 159 |
| 159 } // namespace gfx | 160 } // namespace gfx |
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