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[client/idd] harden demand-driven frame delivery

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This commit is contained in:
Geoffrey McRae
2026-08-04 13:22:19 +10:00
parent 97e7f439c2
commit 5ebc208d43
6 changed files with 129 additions and 28 deletions
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43
client/src/frame_scheduler.c
View File

@@ -217,7 +217,16 @@ void frameScheduler_update(void)
now - l_frameScheduler.lastCadence > FRAME_SCHEDULER_RENEW_NS * 2)
{
if (sendSchedule(LG_TRANSPORT_FRAME_SCHEDULE_RELEASE, 0))
{
l_frameScheduler.active = false;
l_frameScheduler.period = 0;
LG_LOCK(l_frameScheduler.lock);
l_frameScheduler.phaseError = 0;
l_frameScheduler.feedbackFrameSerial = 0;
l_frameScheduler.feedbackSamples = 0;
l_frameScheduler.feedbackDirty = false;
LG_UNLOCK(l_frameScheduler.lock);
}
}
return;
}
@@ -235,6 +244,12 @@ void frameScheduler_update(void)
{
l_frameScheduler.period = period;
++l_frameScheduler.generation;
LG_LOCK(l_frameScheduler.lock);
l_frameScheduler.phaseError = 0;
l_frameScheduler.feedbackFrameSerial = 0;
l_frameScheduler.feedbackSamples = 0;
l_frameScheduler.feedbackDirty = false;
LG_UNLOCK(l_frameScheduler.lock);
}
else
l_frameScheduler.period =
@@ -282,12 +297,11 @@ void frameScheduler_observeRender(uint64_t timestamp)
}
void frameScheduler_feedback(uint64_t frameSerial, uint32_t generation,
uint64_t queueStart, uint64_t prepareStart)
uint64_t measuredPhase)
{
if (!generation || !queueStart || prepareStart < queueStart)
if (!generation)
return;
const uint64_t slack = prepareStart - queueStart;
LG_LOCK(l_frameScheduler.lock);
if (!l_frameScheduler.supported || !l_frameScheduler.active ||
generation != l_frameScheduler.generation)
@@ -296,14 +310,21 @@ void frameScheduler_feedback(uint64_t frameSerial, uint32_t generation,
return;
}
int64_t error = slack > FRAME_SCHEDULER_TARGET_SLACK_NS ?
(int64_t)(slack - FRAME_SCHEDULER_TARGET_SLACK_NS) :
-(int64_t)(FRAME_SCHEDULER_TARGET_SLACK_NS - slack);
const int64_t limit = (int64_t)(l_frameScheduler.period / 2);
if (error > limit)
error = limit;
else if (error < -limit)
error = -limit;
const int64_t period = (int64_t)l_frameScheduler.period;
if (!period)
{
LG_UNLOCK(l_frameScheduler.lock);
return;
}
int64_t error = measuredPhase > FRAME_SCHEDULER_TARGET_SLACK_NS ?
(int64_t)(measuredPhase - FRAME_SCHEDULER_TARGET_SLACK_NS) :
-(int64_t)(FRAME_SCHEDULER_TARGET_SLACK_NS - measuredPhase);
error %= period;
if (error > period / 2)
error -= period;
else if (error < -period / 2)
error += period;
if (!l_frameScheduler.feedbackSamples)
l_frameScheduler.phaseError = error;

2
client/src/frame_scheduler.h
View File

@@ -32,6 +32,6 @@ void frameScheduler_stop(void);
void frameScheduler_update(void);
void frameScheduler_observeRender(uint64_t timestamp);
void frameScheduler_feedback(uint64_t frameSerial, uint32_t generation,
uint64_t queueStart, uint64_t prepareStart);
uint64_t measuredPhase);
#endif

14
client/src/main.c
View File

@@ -434,8 +434,18 @@ static void frameTimingFinishRender(const LG_RendererFrameTiming * timing,
}
LG_UNLOCK(l_frameTiming.lock);
frameScheduler_feedback(feedbackFrameSerial, feedbackGeneration,
feedbackQueueStart, prepareStart);
if (feedbackFrameSerial && feedbackGeneration)
{
uint64_t measuredPhase = timing->swapTime;
if (g_state.jitRender)
{
if (!feedbackQueueStart || prepareStart < feedbackQueueStart)
return;
measuredPhase = prepareStart - feedbackQueueStart;
}
frameScheduler_feedback(
feedbackFrameSerial, feedbackGeneration, measuredPhase);
}
}
static void frameTimingPublishReady(void)