126 lines
4.6 KiB
C++
126 lines
4.6 KiB
C++
/*
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* Copyright 2018 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 <chrono>
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#include <mutex>
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#include "Scheduler.h"
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namespace android::scheduler {
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/*
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* Modulates the vsync-offsets depending on current SurfaceFlinger state.
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*/
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class VSyncModulator {
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private:
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// Number of frames we'll keep the early phase offsets once they are activated for a
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// transaction. This acts as a low-pass filter in case the client isn't quick enough in
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// sending new transactions.
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static constexpr int MIN_EARLY_FRAME_COUNT_TRANSACTION = 2;
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// Number of frames we'll keep the early gl phase offsets once they are activated.
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// This acts as a low-pass filter to avoid scenarios where we rapidly
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// switch in and out of gl composition.
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static constexpr int MIN_EARLY_GL_FRAME_COUNT_TRANSACTION = 2;
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// Margin used to account for potential data races
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static const constexpr std::chrono::nanoseconds MARGIN_FOR_TX_APPLY = 1ms;
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public:
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// Wrapper for a collection of surfaceflinger/app offsets for a particular
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// configuration.
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struct Offsets {
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nsecs_t sf;
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nsecs_t app;
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bool operator==(const Offsets& other) const { return sf == other.sf && app == other.app; }
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bool operator!=(const Offsets& other) const { return !(*this == other); }
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};
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struct OffsetsConfig {
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Offsets early; // For transactions with the eEarlyWakeup flag.
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Offsets earlyGl; // As above but while compositing with GL.
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Offsets late; // Default.
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bool operator==(const OffsetsConfig& other) const {
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return early == other.early && earlyGl == other.earlyGl && late == other.late;
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}
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bool operator!=(const OffsetsConfig& other) const { return !(*this == other); }
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};
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VSyncModulator(IPhaseOffsetControl&, ConnectionHandle appConnectionHandle,
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ConnectionHandle sfConnectionHandle, const OffsetsConfig&);
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void setPhaseOffsets(const OffsetsConfig&) EXCLUDES(mMutex);
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// Signals that a transaction has started, and changes offsets accordingly.
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void setTransactionStart(Scheduler::TransactionStart transactionStart);
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// Signals that a transaction has been completed, so that we can finish
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// special handling for a transaction.
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void onTransactionHandled();
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// Called when we send a refresh rate change to hardware composer, so that
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// we can move into early offsets.
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void onRefreshRateChangeInitiated();
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// Called when we detect from vsync signals that the refresh rate changed.
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// This way we can move out of early offsets if no longer necessary.
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void onRefreshRateChangeCompleted();
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// Called when the display is presenting a new frame. usedRenderEngine
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// should be set to true if RenderEngine was involved with composing the new
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// frame.
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void onRefreshed(bool usedRenderEngine);
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// Returns the offsets that we are currently using
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Offsets getOffsets() const EXCLUDES(mMutex);
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private:
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friend class VSyncModulatorTest;
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// Returns the next offsets that we should be using
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const Offsets& getNextOffsets() const REQUIRES(mMutex);
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// Updates offsets and persists them into the scheduler framework.
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void updateOffsets() EXCLUDES(mMutex);
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void updateOffsetsLocked() REQUIRES(mMutex);
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IPhaseOffsetControl& mPhaseOffsetControl;
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const ConnectionHandle mAppConnectionHandle;
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const ConnectionHandle mSfConnectionHandle;
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mutable std::mutex mMutex;
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OffsetsConfig mOffsetsConfig GUARDED_BY(mMutex);
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Offsets mOffsets GUARDED_BY(mMutex){mOffsetsConfig.late};
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std::atomic<Scheduler::TransactionStart> mTransactionStart =
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Scheduler::TransactionStart::Normal;
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std::atomic<bool> mRefreshRateChangePending = false;
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std::atomic<bool> mExplicitEarlyWakeup = false;
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std::atomic<int> mRemainingEarlyFrameCount = 0;
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std::atomic<int> mRemainingRenderEngineUsageCount = 0;
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std::atomic<std::chrono::steady_clock::time_point> mEarlyTxnStartTime = {};
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std::atomic<std::chrono::steady_clock::time_point> mTxnAppliedTime = {};
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bool mTraceDetailedInfo = false;
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};
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} // namespace android::scheduler
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