484 lines
14 KiB
C++
484 lines
14 KiB
C++
/*
|
|
* Copyright (C) 2013 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#define ATRACE_TAG ATRACE_TAG_GRAPHICS
|
|
|
|
// This is needed for stdint.h to define INT64_MAX in C++
|
|
#define __STDC_LIMIT_MACROS
|
|
|
|
#include <math.h>
|
|
|
|
#include <cutils/log.h>
|
|
|
|
#include <ui/Fence.h>
|
|
|
|
#include <utils/String8.h>
|
|
#include <utils/Thread.h>
|
|
#include <utils/Trace.h>
|
|
#include <utils/Vector.h>
|
|
|
|
#include "DispSync.h"
|
|
#include "EventLog/EventLog.h"
|
|
|
|
namespace android {
|
|
|
|
// Setting this to true enables verbose tracing that can be used to debug
|
|
// vsync event model or phase issues.
|
|
static const bool traceDetailedInfo = false;
|
|
|
|
// This is the threshold used to determine when hardware vsync events are
|
|
// needed to re-synchronize the software vsync model with the hardware. The
|
|
// error metric used is the mean of the squared difference between each
|
|
// present time and the nearest software-predicted vsync.
|
|
static const nsecs_t errorThreshold = 160000000000;
|
|
|
|
// This works around the lack of support for the sync framework on some
|
|
// devices.
|
|
#ifdef RUNNING_WITHOUT_SYNC_FRAMEWORK
|
|
static const bool runningWithoutSyncFramework = true;
|
|
#else
|
|
static const bool runningWithoutSyncFramework = false;
|
|
#endif
|
|
|
|
// This is the offset from the present fence timestamps to the corresponding
|
|
// vsync event.
|
|
static const int64_t presentTimeOffset = PRESENT_TIME_OFFSET_FROM_VSYNC_NS;
|
|
|
|
class DispSyncThread: public Thread {
|
|
public:
|
|
|
|
DispSyncThread():
|
|
mStop(false),
|
|
mPeriod(0),
|
|
mPhase(0),
|
|
mWakeupLatency(0) {
|
|
}
|
|
|
|
virtual ~DispSyncThread() {}
|
|
|
|
void updateModel(nsecs_t period, nsecs_t phase) {
|
|
Mutex::Autolock lock(mMutex);
|
|
mPeriod = period;
|
|
mPhase = phase;
|
|
mCond.signal();
|
|
}
|
|
|
|
void stop() {
|
|
Mutex::Autolock lock(mMutex);
|
|
mStop = true;
|
|
mCond.signal();
|
|
}
|
|
|
|
virtual bool threadLoop() {
|
|
status_t err;
|
|
nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
|
|
nsecs_t nextEventTime = 0;
|
|
|
|
while (true) {
|
|
Vector<CallbackInvocation> callbackInvocations;
|
|
|
|
nsecs_t targetTime = 0;
|
|
|
|
{ // Scope for lock
|
|
Mutex::Autolock lock(mMutex);
|
|
|
|
if (mStop) {
|
|
return false;
|
|
}
|
|
|
|
if (mPeriod == 0) {
|
|
err = mCond.wait(mMutex);
|
|
if (err != NO_ERROR) {
|
|
ALOGE("error waiting for new events: %s (%d)",
|
|
strerror(-err), err);
|
|
return false;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
nextEventTime = computeNextEventTimeLocked(now);
|
|
targetTime = nextEventTime;
|
|
|
|
bool isWakeup = false;
|
|
|
|
if (now < targetTime) {
|
|
err = mCond.waitRelative(mMutex, targetTime - now);
|
|
|
|
if (err == TIMED_OUT) {
|
|
isWakeup = true;
|
|
} else if (err != NO_ERROR) {
|
|
ALOGE("error waiting for next event: %s (%d)",
|
|
strerror(-err), err);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
now = systemTime(SYSTEM_TIME_MONOTONIC);
|
|
|
|
if (isWakeup) {
|
|
mWakeupLatency = ((mWakeupLatency * 63) +
|
|
(now - targetTime)) / 64;
|
|
if (mWakeupLatency > 500000) {
|
|
// Don't correct by more than 500 us
|
|
mWakeupLatency = 500000;
|
|
}
|
|
if (traceDetailedInfo) {
|
|
ATRACE_INT64("DispSync:WakeupLat", now - nextEventTime);
|
|
ATRACE_INT64("DispSync:AvgWakeupLat", mWakeupLatency);
|
|
}
|
|
}
|
|
|
|
callbackInvocations = gatherCallbackInvocationsLocked(now);
|
|
}
|
|
|
|
if (callbackInvocations.size() > 0) {
|
|
fireCallbackInvocations(callbackInvocations);
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
status_t addEventListener(nsecs_t phase, const sp<DispSync::Callback>& callback) {
|
|
Mutex::Autolock lock(mMutex);
|
|
|
|
for (size_t i = 0; i < mEventListeners.size(); i++) {
|
|
if (mEventListeners[i].mCallback == callback) {
|
|
return BAD_VALUE;
|
|
}
|
|
}
|
|
|
|
EventListener listener;
|
|
listener.mPhase = phase;
|
|
listener.mCallback = callback;
|
|
listener.mLastEventTime = systemTime(SYSTEM_TIME_MONOTONIC);
|
|
mEventListeners.push(listener);
|
|
|
|
mCond.signal();
|
|
|
|
return NO_ERROR;
|
|
}
|
|
|
|
status_t removeEventListener(const sp<DispSync::Callback>& callback) {
|
|
Mutex::Autolock lock(mMutex);
|
|
|
|
for (size_t i = 0; i < mEventListeners.size(); i++) {
|
|
if (mEventListeners[i].mCallback == callback) {
|
|
mEventListeners.removeAt(i);
|
|
mCond.signal();
|
|
return NO_ERROR;
|
|
}
|
|
}
|
|
|
|
return BAD_VALUE;
|
|
}
|
|
|
|
// This method is only here to handle the runningWithoutSyncFramework
|
|
// case.
|
|
bool hasAnyEventListeners() {
|
|
Mutex::Autolock lock(mMutex);
|
|
return !mEventListeners.empty();
|
|
}
|
|
|
|
private:
|
|
|
|
struct EventListener {
|
|
nsecs_t mPhase;
|
|
nsecs_t mLastEventTime;
|
|
sp<DispSync::Callback> mCallback;
|
|
};
|
|
|
|
struct CallbackInvocation {
|
|
sp<DispSync::Callback> mCallback;
|
|
nsecs_t mEventTime;
|
|
};
|
|
|
|
nsecs_t computeNextEventTimeLocked(nsecs_t now) {
|
|
nsecs_t nextEventTime = INT64_MAX;
|
|
for (size_t i = 0; i < mEventListeners.size(); i++) {
|
|
nsecs_t t = computeListenerNextEventTimeLocked(mEventListeners[i],
|
|
now);
|
|
|
|
if (t < nextEventTime) {
|
|
nextEventTime = t;
|
|
}
|
|
}
|
|
|
|
return nextEventTime;
|
|
}
|
|
|
|
Vector<CallbackInvocation> gatherCallbackInvocationsLocked(nsecs_t now) {
|
|
Vector<CallbackInvocation> callbackInvocations;
|
|
nsecs_t ref = now - mPeriod;
|
|
|
|
for (size_t i = 0; i < mEventListeners.size(); i++) {
|
|
nsecs_t t = computeListenerNextEventTimeLocked(mEventListeners[i],
|
|
ref);
|
|
|
|
if (t < now) {
|
|
CallbackInvocation ci;
|
|
ci.mCallback = mEventListeners[i].mCallback;
|
|
ci.mEventTime = t;
|
|
callbackInvocations.push(ci);
|
|
mEventListeners.editItemAt(i).mLastEventTime = t;
|
|
}
|
|
}
|
|
|
|
return callbackInvocations;
|
|
}
|
|
|
|
nsecs_t computeListenerNextEventTimeLocked(const EventListener& listener,
|
|
nsecs_t ref) {
|
|
|
|
nsecs_t lastEventTime = listener.mLastEventTime;
|
|
if (ref < lastEventTime) {
|
|
ref = lastEventTime;
|
|
}
|
|
|
|
nsecs_t phase = mPhase + listener.mPhase;
|
|
nsecs_t t = (((ref - phase) / mPeriod) + 1) * mPeriod + phase;
|
|
|
|
if (t - listener.mLastEventTime < mPeriod / 2) {
|
|
t += mPeriod;
|
|
}
|
|
|
|
return t;
|
|
}
|
|
|
|
void fireCallbackInvocations(const Vector<CallbackInvocation>& callbacks) {
|
|
for (size_t i = 0; i < callbacks.size(); i++) {
|
|
callbacks[i].mCallback->onDispSyncEvent(callbacks[i].mEventTime);
|
|
}
|
|
}
|
|
|
|
bool mStop;
|
|
|
|
nsecs_t mPeriod;
|
|
nsecs_t mPhase;
|
|
nsecs_t mWakeupLatency;
|
|
|
|
Vector<EventListener> mEventListeners;
|
|
|
|
Mutex mMutex;
|
|
Condition mCond;
|
|
};
|
|
|
|
class ZeroPhaseTracer : public DispSync::Callback {
|
|
public:
|
|
ZeroPhaseTracer() : mParity(false) {}
|
|
|
|
virtual void onDispSyncEvent(nsecs_t when) {
|
|
mParity = !mParity;
|
|
ATRACE_INT("ZERO_PHASE_VSYNC", mParity ? 1 : 0);
|
|
}
|
|
|
|
private:
|
|
bool mParity;
|
|
};
|
|
|
|
DispSync::DispSync() {
|
|
mThread = new DispSyncThread();
|
|
mThread->run("DispSync", PRIORITY_URGENT_DISPLAY + PRIORITY_MORE_FAVORABLE);
|
|
|
|
reset();
|
|
beginResync();
|
|
|
|
if (traceDetailedInfo) {
|
|
// If runningWithoutSyncFramework is true then the ZeroPhaseTracer
|
|
// would prevent HW vsync event from ever being turned off.
|
|
// Furthermore the zero-phase tracing is not needed because any time
|
|
// there is an event registered we will turn on the HW vsync events.
|
|
if (!runningWithoutSyncFramework) {
|
|
addEventListener(0, new ZeroPhaseTracer());
|
|
}
|
|
}
|
|
}
|
|
|
|
DispSync::~DispSync() {}
|
|
|
|
void DispSync::reset() {
|
|
Mutex::Autolock lock(mMutex);
|
|
|
|
mNumResyncSamples = 0;
|
|
mFirstResyncSample = 0;
|
|
mNumResyncSamplesSincePresent = 0;
|
|
resetErrorLocked();
|
|
}
|
|
|
|
bool DispSync::addPresentFence(const sp<Fence>& fence) {
|
|
Mutex::Autolock lock(mMutex);
|
|
|
|
mPresentFences[mPresentSampleOffset] = fence;
|
|
mPresentTimes[mPresentSampleOffset] = 0;
|
|
mPresentSampleOffset = (mPresentSampleOffset + 1) % NUM_PRESENT_SAMPLES;
|
|
mNumResyncSamplesSincePresent = 0;
|
|
|
|
for (size_t i = 0; i < NUM_PRESENT_SAMPLES; i++) {
|
|
const sp<Fence>& f(mPresentFences[i]);
|
|
if (f != NULL) {
|
|
nsecs_t t = f->getSignalTime();
|
|
if (t < INT64_MAX) {
|
|
mPresentFences[i].clear();
|
|
mPresentTimes[i] = t + presentTimeOffset;
|
|
}
|
|
}
|
|
}
|
|
|
|
updateErrorLocked();
|
|
|
|
return mPeriod == 0 || mError > errorThreshold;
|
|
}
|
|
|
|
void DispSync::beginResync() {
|
|
Mutex::Autolock lock(mMutex);
|
|
|
|
mNumResyncSamples = 0;
|
|
}
|
|
|
|
bool DispSync::addResyncSample(nsecs_t timestamp) {
|
|
Mutex::Autolock lock(mMutex);
|
|
|
|
size_t idx = (mFirstResyncSample + mNumResyncSamples) % MAX_RESYNC_SAMPLES;
|
|
mResyncSamples[idx] = timestamp;
|
|
|
|
if (mNumResyncSamples < MAX_RESYNC_SAMPLES) {
|
|
mNumResyncSamples++;
|
|
} else {
|
|
mFirstResyncSample = (mFirstResyncSample + 1) % MAX_RESYNC_SAMPLES;
|
|
}
|
|
|
|
updateModelLocked();
|
|
|
|
if (mNumResyncSamplesSincePresent++ > MAX_RESYNC_SAMPLES_WITHOUT_PRESENT) {
|
|
resetErrorLocked();
|
|
}
|
|
|
|
if (runningWithoutSyncFramework) {
|
|
// If we don't have the sync framework we will never have
|
|
// addPresentFence called. This means we have no way to know whether
|
|
// or not we're synchronized with the HW vsyncs, so we just request
|
|
// that the HW vsync events be turned on whenever we need to generate
|
|
// SW vsync events.
|
|
return mThread->hasAnyEventListeners();
|
|
}
|
|
|
|
return mPeriod == 0 || mError > errorThreshold;
|
|
}
|
|
|
|
void DispSync::endResync() {
|
|
}
|
|
|
|
status_t DispSync::addEventListener(nsecs_t phase,
|
|
const sp<Callback>& callback) {
|
|
|
|
Mutex::Autolock lock(mMutex);
|
|
return mThread->addEventListener(phase, callback);
|
|
}
|
|
|
|
status_t DispSync::removeEventListener(const sp<Callback>& callback) {
|
|
Mutex::Autolock lock(mMutex);
|
|
return mThread->removeEventListener(callback);
|
|
}
|
|
|
|
void DispSync::setPeriod(nsecs_t period) {
|
|
Mutex::Autolock lock(mMutex);
|
|
mPeriod = period;
|
|
mPhase = 0;
|
|
mThread->updateModel(mPeriod, mPhase);
|
|
}
|
|
|
|
void DispSync::updateModelLocked() {
|
|
if (mNumResyncSamples >= MIN_RESYNC_SAMPLES_FOR_UPDATE) {
|
|
nsecs_t durationSum = 0;
|
|
for (size_t i = 1; i < mNumResyncSamples; i++) {
|
|
size_t idx = (mFirstResyncSample + i) % MAX_RESYNC_SAMPLES;
|
|
size_t prev = (idx + MAX_RESYNC_SAMPLES - 1) % MAX_RESYNC_SAMPLES;
|
|
durationSum += mResyncSamples[idx] - mResyncSamples[prev];
|
|
}
|
|
|
|
mPeriod = durationSum / (mNumResyncSamples - 1);
|
|
|
|
double sampleAvgX = 0;
|
|
double sampleAvgY = 0;
|
|
double scale = 2.0 * M_PI / double(mPeriod);
|
|
for (size_t i = 0; i < mNumResyncSamples; i++) {
|
|
size_t idx = (mFirstResyncSample + i) % MAX_RESYNC_SAMPLES;
|
|
nsecs_t sample = mResyncSamples[idx];
|
|
double samplePhase = double(sample % mPeriod) * scale;
|
|
sampleAvgX += cos(samplePhase);
|
|
sampleAvgY += sin(samplePhase);
|
|
}
|
|
|
|
sampleAvgX /= double(mNumResyncSamples);
|
|
sampleAvgY /= double(mNumResyncSamples);
|
|
|
|
mPhase = nsecs_t(atan2(sampleAvgY, sampleAvgX) / scale);
|
|
|
|
if (mPhase < 0) {
|
|
mPhase += mPeriod;
|
|
}
|
|
|
|
if (traceDetailedInfo) {
|
|
ATRACE_INT64("DispSync:Period", mPeriod);
|
|
ATRACE_INT64("DispSync:Phase", mPhase);
|
|
}
|
|
|
|
mThread->updateModel(mPeriod, mPhase);
|
|
}
|
|
}
|
|
|
|
void DispSync::updateErrorLocked() {
|
|
if (mPeriod == 0) {
|
|
return;
|
|
}
|
|
|
|
int numErrSamples = 0;
|
|
nsecs_t sqErrSum = 0;
|
|
|
|
for (size_t i = 0; i < NUM_PRESENT_SAMPLES; i++) {
|
|
nsecs_t sample = mPresentTimes[i];
|
|
if (sample > mPhase) {
|
|
nsecs_t sampleErr = (sample - mPhase) % mPeriod;
|
|
if (sampleErr > mPeriod / 2) {
|
|
sampleErr -= mPeriod;
|
|
}
|
|
sqErrSum += sampleErr * sampleErr;
|
|
numErrSamples++;
|
|
}
|
|
}
|
|
|
|
if (numErrSamples > 0) {
|
|
mError = sqErrSum / numErrSamples;
|
|
} else {
|
|
mError = 0;
|
|
}
|
|
|
|
if (traceDetailedInfo) {
|
|
ATRACE_INT64("DispSync:Error", mError);
|
|
}
|
|
}
|
|
|
|
void DispSync::resetErrorLocked() {
|
|
mPresentSampleOffset = 0;
|
|
mError = 0;
|
|
for (size_t i = 0; i < NUM_PRESENT_SAMPLES; i++) {
|
|
mPresentFences[i].clear();
|
|
mPresentTimes[i] = 0;
|
|
}
|
|
}
|
|
|
|
} // namespace android
|