140 lines
4.8 KiB
C++
140 lines
4.8 KiB
C++
/*
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* Copyright 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <mutex>
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#include <unordered_map>
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#include <vector>
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#include <android-base/thread_annotations.h>
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#include <ui/DisplayId.h>
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#include "VSyncTracker.h"
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namespace android::scheduler {
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class VSyncPredictor : public VSyncTracker {
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public:
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/*
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* \param [in] PhysicalDisplayid The display this corresponds to.
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* \param [in] idealPeriod The initial ideal period to use.
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* \param [in] historySize The internal amount of entries to store in the model.
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* \param [in] minimumSamplesForPrediction The minimum number of samples to collect before
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* predicting. \param [in] outlierTolerancePercent a number 0 to 100 that will be used to filter
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* samples that fall outlierTolerancePercent from an anticipated vsync event.
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*/
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VSyncPredictor(PhysicalDisplayId, nsecs_t idealPeriod, size_t historySize,
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size_t minimumSamplesForPrediction, uint32_t outlierTolerancePercent);
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~VSyncPredictor();
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bool addVsyncTimestamp(nsecs_t timestamp) final EXCLUDES(mMutex);
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nsecs_t nextAnticipatedVSyncTimeFrom(nsecs_t timePoint) const final EXCLUDES(mMutex);
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nsecs_t currentPeriod() const final EXCLUDES(mMutex);
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void resetModel() final EXCLUDES(mMutex);
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/*
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* Inform the model that the period is anticipated to change to a new value.
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* model will use the period parameter to predict vsync events until enough
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* timestamps with the new period have been collected.
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*
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* \param [in] period The new period that should be used.
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*/
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void setPeriod(nsecs_t period) final EXCLUDES(mMutex);
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/* Query if the model is in need of more samples to make a prediction.
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* \return True, if model would benefit from more samples, False if not.
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*/
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bool needsMoreSamples() const final EXCLUDES(mMutex);
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struct Model {
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nsecs_t slope;
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nsecs_t intercept;
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};
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VSyncPredictor::Model getVSyncPredictionModel() const EXCLUDES(mMutex);
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bool isVSyncInPhase(nsecs_t timePoint, Fps frameRate) const final EXCLUDES(mMutex);
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void setRenderRate(Fps) final EXCLUDES(mMutex);
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void dump(std::string& result) const final EXCLUDES(mMutex);
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private:
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VSyncPredictor(VSyncPredictor const&) = delete;
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VSyncPredictor& operator=(VSyncPredictor const&) = delete;
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void clearTimestamps() REQUIRES(mMutex);
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const PhysicalDisplayId mId;
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inline void traceInt64If(const char* name, int64_t value) const;
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inline void traceInt64(const char* name, int64_t value) const;
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size_t next(size_t i) const REQUIRES(mMutex);
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bool validate(nsecs_t timestamp) const REQUIRES(mMutex);
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Model getVSyncPredictionModelLocked() const REQUIRES(mMutex);
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nsecs_t nextAnticipatedVSyncTimeFromLocked(nsecs_t timePoint) const REQUIRES(mMutex);
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bool isVSyncInPhaseLocked(nsecs_t timePoint, unsigned divisor) const REQUIRES(mMutex);
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struct VsyncSequence {
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nsecs_t vsyncTime;
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int64_t seq;
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};
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VsyncSequence getVsyncSequenceLocked(nsecs_t timestamp) const REQUIRES(mMutex);
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bool const mTraceOn;
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size_t const kHistorySize;
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size_t const kMinimumSamplesForPrediction;
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size_t const kOutlierTolerancePercent;
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std::mutex mutable mMutex;
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nsecs_t mIdealPeriod GUARDED_BY(mMutex);
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std::optional<nsecs_t> mKnownTimestamp GUARDED_BY(mMutex);
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// Map between ideal vsync period and the calculated model
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std::unordered_map<nsecs_t, Model> mutable mRateMap GUARDED_BY(mMutex);
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size_t mLastTimestampIndex GUARDED_BY(mMutex) = 0;
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std::vector<nsecs_t> mTimestamps GUARDED_BY(mMutex);
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std::optional<Fps> mRenderRate GUARDED_BY(mMutex);
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mutable std::optional<VsyncSequence> mLastVsyncSequence GUARDED_BY(mMutex);
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#ifdef MTK_SF_MSYNC_3
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public:
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// To optimize SF wake up time, we should not use
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// the last known timestamp to guess next hw vsync.
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// Instead, we used already predicted vsync to guess.
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// Because, that vsync could be correct with high chance.
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void setNextPredictedTargetVsync(nsecs_t);
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private:
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nsecs_t mNextPredictedTargetdVsync = 0;
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#endif
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#ifdef MTK_SF_MSYNC
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public:
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void setMSyncOn(bool);
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void setQ2QFull(bool);
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private:
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bool mMSyncOn = false;
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bool mMSyncTriggerResync = false;
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bool mMSyncQ2QFull = false;
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#endif
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};
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} // namespace android::scheduler
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