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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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27
idd/LGInput/CHIDDevice.cpp
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@@ -248,6 +248,8 @@ static bool CompactQueuedMotion(_Inout_ HIDDeviceContext * context)
previous->x = static_cast<int16_t>(x);
previous->y = static_cast<int16_t>(y);
if (second.enqueueTicks)
first.enqueueTicks = second.enqueueTicks;
RemoveQueuedReport(context, i + 1);
++context->statistics.relativeCoalesced;
return true;
@@ -265,6 +267,8 @@ static bool CompactQueuedMotion(_Inout_ HIDDeviceContext * context)
continue;
CopyMemory(first.data, second.data, second.size);
if (second.enqueueTicks)
first.enqueueTicks = second.enqueueTicks;
first.size = second.size;
RemoveQueuedReport(context, i + 1);
++context->statistics.staleAbsoluteCompacted;
@@ -311,6 +315,9 @@ static NTSTATUS QueueReport(
{
previous->x = static_cast<int16_t>(x);
previous->y = static_cast<int16_t>(y);
LARGE_INTEGER enqueueTime = {};
if (QueryPerformanceCounter(&enqueueTime))
tail.enqueueTicks = enqueueTime.QuadPart;
++context->statistics.relativeCoalesced;
return STATUS_SUCCESS;
}
@@ -326,6 +333,9 @@ static NTSTATUS QueueReport(
!previous->wheel && !current->wheel)
{
CopyMemory(tail.data, data, size);
LARGE_INTEGER enqueueTime = {};
if (QueryPerformanceCounter(&enqueueTime))
tail.enqueueTicks = enqueueTime.QuadPart;
tail.size = size;
++context->statistics.absoluteCoalesced;
return STATUS_SUCCESS;
@@ -361,9 +371,9 @@ static NTSTATUS ReadReport(
_In_ WDFREQUEST request,
_Out_ bool * complete)
{
HIDQueuedReport report = {};
HIDQueuedReport report = {};
bool haveReport = false;
*complete = true;
*complete = true;
NTSTATUS status;
{
@@ -372,13 +382,22 @@ static NTSTATUS ReadReport(
status = STATUS_DEVICE_NOT_READY;
else if (context->reportCount)
{
// If Windows stopped issuing reads temporarily, deliver one current
// aggregate instead of replaying every stale motion report accumulated
// while it was stalled. Transitions remain ordered and are never
// compacted.
if (MotionBudgetExceeded(context))
while (CompactQueuedMotion(context))
{
}
PopReport(context, &report);
haveReport = true;
status = STATUS_SUCCESS;
status = STATUS_SUCCESS;
}
else
{
status = WdfRequestForwardToIoQueue(request, context->reportQueue);
status = WdfRequestForwardToIoQueue(request, context->reportQueue);
*complete = !NT_SUCCESS(status);
}
}