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[client/idd] input: complete network latency path

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Isolate input sends from shared transport accounting and reserve
reliable capacity.

Prioritize QUIC execution and bound stale motion through the Windows
pipe and HID queues.
This commit is contained in:
Geoffrey McRae
2026-10-08 21:34:24 +11:00
parent 1af2f13440
commit b1dda92f09
9 changed files with 695 additions and 344 deletions
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26
idd/LGIdd/ipc/CInputPipeServer.cpp
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@@ -76,7 +76,12 @@ bool CInputPipeServer::Init()
if (!m_endpoint.Start(
LG_INPUT_PIPE_NAME,
CPipeEndpoint::Mode::Server,
sizeof(LGInputPipeMessage)))
sizeof(LGInputPipeMessage),
nullptr,
0,
0,
CPipeEndpoint::ThreadScheduling::Normal,
PIPE_WRITE_TIMEOUT_MS))
{
DeInit();
return false;
@@ -193,6 +198,8 @@ bool CInputPipeServer::CompactQueuedMotionLocked()
first.payload.mouseRelative.deltaX = static_cast<int32_t>(x);
first.payload.mouseRelative.deltaY = static_cast<int32_t>(y);
if (second.enqueueTicks)
first.enqueueTicks = second.enqueueTicks;
RemoveQueueItemLocked(i + 1);
++m_statRelativeCoalesced;
return true;
@@ -207,6 +214,8 @@ bool CInputPipeServer::CompactQueuedMotionLocked()
first.payload.mouseAbsolute.x = second.payload.mouseAbsolute.x;
first.payload.mouseAbsolute.y = second.payload.mouseAbsolute.y;
if (second.enqueueTicks)
first.enqueueTicks = second.enqueueTicks;
RemoveQueueItemLocked(i + 1);
++m_statAbsoluteCoalesced;
return true;
@@ -253,6 +262,9 @@ bool CInputPipeServer::QueueLocked(
{
tail.payload.mouseRelative.deltaX = static_cast<int32_t>(x);
tail.payload.mouseRelative.deltaY = static_cast<int32_t>(y);
LARGE_INTEGER enqueueTime = {};
if (QueryPerformanceCounter(&enqueueTime))
tail.enqueueTicks = enqueueTime.QuadPart;
++m_statRelativeCoalesced;
return true;
}
@@ -266,6 +278,9 @@ bool CInputPipeServer::QueueLocked(
{
tail.payload.mouseAbsolute.x = payload.mouseAbsolute.x;
tail.payload.mouseAbsolute.y = payload.mouseAbsolute.y;
LARGE_INTEGER enqueueTime = {};
if (QueryPerformanceCounter(&enqueueTime))
tail.enqueueTicks = enqueueTime.QuadPart;
++m_statAbsoluteCoalesced;
return true;
}
@@ -503,7 +518,14 @@ bool CInputPipeServer::Pop(QueueItem& item)
if (!m_queueCount)
return false;
item = m_queue[m_queueHead];
// A blocked pipe write can leave a run of stale motion queued behind it.
// Collapse that run before the next write without combining fresh motion.
if (MotionBudgetExceededLocked())
while (CompactQueuedMotionLocked())
{
}
item = m_queue[m_queueHead];
m_queueHead = (m_queueHead + 1) % QUEUE_LENGTH;
--m_queueCount;
if (m_queueCount)