235 lines
5.9 KiB
C++
235 lines
5.9 KiB
C++
/*
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SPDX-FileCopyrightText: 2020 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
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SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "renderloop.h"
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#include "options.h"
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#include "renderloop_p.h"
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#include "utils.h"
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namespace KWin
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{
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template <typename T>
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T alignTimestamp(const T ×tamp, const T &alignment)
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{
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return timestamp + ((alignment - (timestamp % alignment)) % alignment);
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}
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RenderLoopPrivate *RenderLoopPrivate::get(RenderLoop *loop)
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{
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return loop->d.data();
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}
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RenderLoopPrivate::RenderLoopPrivate(RenderLoop *q)
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: q(q)
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{
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compositeTimer.setSingleShot(true);
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QObject::connect(&compositeTimer, &QTimer::timeout, q, [this]() { dispatch(); });
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}
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void RenderLoopPrivate::scheduleRepaint()
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{
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if (compositeTimer.isActive()) {
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return;
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}
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const std::chrono::nanoseconds currentTime(std::chrono::steady_clock::now().time_since_epoch());
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const std::chrono::nanoseconds vblankInterval(1'000'000'000'000ull / refreshRate);
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// Estimate when the next presentation will occur. Note that this is a prediction.
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nextPresentationTimestamp = lastPresentationTimestamp + vblankInterval;
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if (nextPresentationTimestamp < currentTime) {
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nextPresentationTimestamp = lastPresentationTimestamp
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+ alignTimestamp(currentTime - lastPresentationTimestamp, vblankInterval);
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}
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// Estimate when it's a good time to perform the next compositing cycle.
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const std::chrono::nanoseconds safetyMargin = std::chrono::milliseconds(3);
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std::chrono::nanoseconds renderTime;
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switch (options->latencyPolicy()) {
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case LatencyExteremelyLow:
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renderTime = std::chrono::nanoseconds(long(vblankInterval.count() * 0.1));
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break;
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case LatencyLow:
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renderTime = std::chrono::nanoseconds(long(vblankInterval.count() * 0.25));
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break;
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case LatencyMedium:
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renderTime = std::chrono::nanoseconds(long(vblankInterval.count() * 0.5));
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break;
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case LatencyHigh:
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renderTime = std::chrono::nanoseconds(long(vblankInterval.count() * 0.75));
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break;
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case LatencyExtremelyHigh:
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renderTime = std::chrono::nanoseconds(long(vblankInterval.count() * 0.9));
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break;
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}
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switch (options->renderTimeEstimator()) {
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case RenderTimeEstimatorMinimum:
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renderTime = std::max(renderTime, renderJournal.minimum());
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break;
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case RenderTimeEstimatorMaximum:
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renderTime = std::max(renderTime, renderJournal.maximum());
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break;
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case RenderTimeEstimatorAverage:
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renderTime = std::max(renderTime, renderJournal.average());
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break;
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}
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std::chrono::nanoseconds nextRenderTimestamp = nextPresentationTimestamp - renderTime - safetyMargin;
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// If we can't render the frame before the deadline, start compositing immediately.
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if (nextRenderTimestamp < currentTime) {
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nextRenderTimestamp = currentTime;
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}
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const std::chrono::nanoseconds waitInterval = nextRenderTimestamp - currentTime;
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compositeTimer.start(std::chrono::duration_cast<std::chrono::milliseconds>(waitInterval));
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}
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void RenderLoopPrivate::delayScheduleRepaint()
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{
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pendingReschedule = true;
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}
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void RenderLoopPrivate::maybeScheduleRepaint()
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{
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if (pendingReschedule) {
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scheduleRepaint();
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pendingReschedule = false;
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}
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}
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void RenderLoopPrivate::notifyFrameFailed()
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{
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Q_ASSERT(pendingFrameCount > 0);
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pendingFrameCount--;
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if (!inhibitCount) {
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maybeScheduleRepaint();
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}
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}
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void RenderLoopPrivate::notifyFrameCompleted(std::chrono::nanoseconds timestamp)
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{
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Q_ASSERT(pendingFrameCount > 0);
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pendingFrameCount--;
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if (lastPresentationTimestamp <= timestamp) {
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lastPresentationTimestamp = timestamp;
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} else {
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qCWarning(KWIN_CORE, "Got invalid presentation timestamp: %ld (current %ld)",
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timestamp.count(), lastPresentationTimestamp.count());
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lastPresentationTimestamp = std::chrono::steady_clock::now().time_since_epoch();
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}
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if (!inhibitCount) {
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maybeScheduleRepaint();
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}
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emit q->framePresented(q, timestamp);
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}
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void RenderLoopPrivate::dispatch()
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{
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// On X11, we want to ignore repaints that are scheduled by windows right before
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// the Compositor starts repainting.
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pendingRepaint = true;
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emit q->frameRequested(q);
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// The Compositor may decide to not repaint when the frameRequested() signal is
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// emitted, in which case the pending repaint flag has to be reset manually.
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pendingRepaint = false;
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}
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void RenderLoopPrivate::invalidate()
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{
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pendingReschedule = false;
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pendingFrameCount = 0;
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compositeTimer.stop();
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}
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RenderLoop::RenderLoop(QObject *parent)
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: QObject(parent)
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, d(new RenderLoopPrivate(this))
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{
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}
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RenderLoop::~RenderLoop()
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{
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}
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void RenderLoop::inhibit()
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{
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d->inhibitCount++;
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if (d->inhibitCount == 1) {
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d->compositeTimer.stop();
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}
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}
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void RenderLoop::uninhibit()
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{
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Q_ASSERT(d->inhibitCount > 0);
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d->inhibitCount--;
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if (d->inhibitCount == 0) {
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d->maybeScheduleRepaint();
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}
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}
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void RenderLoop::beginFrame()
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{
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d->pendingRepaint = false;
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d->pendingFrameCount++;
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d->renderJournal.beginFrame();
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}
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void RenderLoop::endFrame()
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{
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d->renderJournal.endFrame();
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}
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int RenderLoop::refreshRate() const
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{
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return d->refreshRate;
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}
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void RenderLoop::setRefreshRate(int refreshRate)
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{
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if (d->refreshRate == refreshRate) {
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return;
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}
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d->refreshRate = refreshRate;
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emit refreshRateChanged();
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}
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void RenderLoop::scheduleRepaint()
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{
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if (d->pendingRepaint) {
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return;
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}
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if (!d->pendingFrameCount && !d->inhibitCount) {
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d->scheduleRepaint();
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} else {
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d->delayScheduleRepaint();
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}
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}
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std::chrono::nanoseconds RenderLoop::lastPresentationTimestamp() const
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{
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return d->lastPresentationTimestamp;
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}
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std::chrono::nanoseconds RenderLoop::nextPresentationTimestamp() const
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{
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return d->nextPresentationTimestamp;
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}
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} // namespace KWin
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