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[idd] scheduler: retain frames behind stalled owners

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Keep preparing the newest frame when both private owner lanes remain
referenced by a non-consuming timing client. Reuse only an unreferenced
completed buffer and continue serving eligible shared subscribers.

Track owner delivery separately from local retention so cadence advances
without acknowledging owner delivery or accepting phase feedback. Republish
the newest completed frame as soon as an owner lane becomes available.
This commit is contained in:
Geoffrey McRae
2026-08-06 16:56:25 +10:00
parent 05fe4f1dd8
commit ece6afd74e
5 changed files with 210 additions and 48 deletions
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16
idd/LGIdd/CSwapChainProcessor.cpp
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@@ -1208,7 +1208,8 @@ bool CSwapChainProcessor::PublishNewestCandidate(
candidate.srcFormat,
candidate.dstFormat,
candidate.dirtyRects,
candidate.nbDirtyRects);
candidate.nbDirtyRects,
schedule);
if (!buffer.mem)
{
restoreCandidates();
@@ -1298,10 +1299,12 @@ bool CSwapChainProcessor::PublishNewestCandidate(
copyDirtyRects, nbCopyDirtyRects, fullCopy);
copySlot->EndTiming();
// Reserve the LGMP message before submitting the copy. This makes post
// failure recoverable without racing a very fast GPU completion callback.
// Reserve the LGMP delivery or retained-frame slot before submitting the
// copy. This makes failure recoverable without racing a very fast GPU
// completion callback.
bool deliveredToOwner;
if (!m_devContext->PublishFrameBuffer(
buffer.frameIndex, schedule))
buffer.frameIndex, schedule, deliveredToOwner))
{
copySlot->Cancel();
m_devContext->AbortFrameBuffer(buffer.frameIndex);
@@ -1311,7 +1314,8 @@ bool CSwapChainProcessor::PublishNewestCandidate(
CFrameScheduler::Schedule frameSchedule = schedule;
// Phase accounting must never hold up D3D submission. Keep the immutable
// delivery identity and discard only this feedback sample on contention.
if (!m_devContext->TryFrameSubmitted(buffer.frameIndex, schedule))
if (!deliveredToOwner ||
!m_devContext->TryFrameSubmitted(buffer.frameIndex, schedule))
frameSchedule.phaseEligible = false;
fbRes->SetSchedule(frameSchedule);
@@ -1356,7 +1360,7 @@ bool CSwapChainProcessor::PublishNewestCandidate(
}
m_devContext->CommitFrameBuffer(
buffer.frameIndex, schedule, periodic);
buffer.frameIndex, schedule, periodic, deliveredToOwner);
unsigned superseded = 0;
AcquireSRWLockExclusive(&m_candidateLock);