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[client/idd] input: reduce network latency

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Route input through a dedicated high-priority stream, send pointer
motion as cumulative datagrams, and recover suspected loss reliably.

Reduce downstream input queuing with age-aware coalescing and input
thread scheduling.
This commit is contained in:
Geoffrey McRae
2026-10-08 20:34:04 +11:00
parent e30afaca2d
commit 1af2f13440
17 changed files with 3359 additions and 759 deletions
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21
idd/LGIdd/transport/CInputHub.h
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@@ -77,15 +77,18 @@ private:
mutable CSRWLock m_lock;
CSRWLock m_lifecycleLock;
CSRWLock m_authorityLock;
Source m_sources[MAX_SOURCES];
IInputSink * m_sink = nullptr;
uint64_t m_sinkState = 0;
IInputSink * m_sink = nullptr;
uint64_t m_sinkState = 0;
SourceKey m_owner;
uint64_t m_ownerDeadline = 0;
uint64_t m_ownerDeadline = 0;
uint64_t m_authorityGeneration = 1;
uint64_t m_inputGeneration = 1;
SourceKey m_interactionOwner;
uint64_t m_interactionDeadline = 0;
uint64_t m_interactionSerial = 1;
bool m_started = false;
uint64_t m_interactionDeadline = 0;
uint64_t m_interactionSerial = 1;
bool m_started = false;
bool SourceValid(const SourceKey& source) const;
bool BindingPresent(const SourceKey& source) const;
@@ -94,7 +97,13 @@ private:
void ClearInteraction();
void InvalidateInteraction();
void AdvanceInteractionSerial();
void AdvanceAuthorityGeneration();
void AdvanceInputGeneration();
bool StateAvailable() const;
InputResult ReconcileAuthorityState(const SourceKey& source);
bool CheckState();
void HandleSinkFailure(const SourceKey& source, bool reset,
uint64_t inputGeneration);
InputTargetState GetState(const SourceKey& source);
bool WithAuthority(const SourceKey& source,
InputAuthorityAction action, void * opaque);