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[idd] input: receive LGMP input reports

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Add an optional input transport and a dedicated LGMP receiver that
validates source ownership, generations, ordered sequences, and leases.

Poll input outside the 10 ms control timer. Forward mouse and keyboard
state through the LGInput pipe, and neutralize the endpoint before
ownership changes or transport failures can leave input held.
This commit is contained in:
Geoffrey McRae
2026-08-08 22:46:07 +10:00
parent 7f4a14a543
commit 83c552fb9d
13 changed files with 1006 additions and 91 deletions
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75
idd/LGIdd/display/CDeviceContext.cpp
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@@ -21,8 +21,10 @@
#include "display/CDeviceContext.h"
#include "display/IddCxCompat.h"
#include "ipc/CInputPipeServer.h"
#include "ipc/CPipeServer.h"
#include "transport/IFrameTransport.h"
#include "transport/IInputTransport.h"
#include "transport/TransportFactory.h"
#include "CDebug.h"
@@ -55,6 +57,9 @@ CDeviceContext::~CDeviceContext()
WdfTimerStop(m_transportTimer, TRUE);
m_transportTimer = nullptr;
}
if (m_transport && m_transport->Input())
m_transport->Input()->Stop();
}
void CDeviceContext::QueryIddCxCapabilities()
@@ -462,41 +467,49 @@ bool CDeviceContext::SetupTransport(size_t alignSize)
{
// Frame buffers cannot be allocated until the GPU-specific alignment is
// known. The swap-chain path may call this again after setup completed.
if (m_transport->Frames().GetMaxFrameSize())
return true;
if (!InitializeTransport() || !m_transport->Setup(alignSize))
return false;
WDF_TIMER_CONFIG config;
WDF_TIMER_CONFIG_INIT_PERIODIC(&config,
[](WDFTIMER timer) -> void
{
WDFOBJECT parent = WdfTimerGetParentObject(timer);
auto wrapper = WdfObjectGet_CDeviceContextWrapper(parent);
wrapper->context->TransportTimer();
},
10);
config.AutomaticSerialization = FALSE;
/**
* Documentation states that Dispatch is not available under UMDF, however
* using Passive returns a not-supported error and Dispatch works.
*/
WDF_OBJECT_ATTRIBUTES attribs;
WDF_OBJECT_ATTRIBUTES_INIT(&attribs);
attribs.ParentObject = m_wdfDevice;
attribs.ExecutionLevel = WdfExecutionLevelDispatch;
NTSTATUS status = WdfTimerCreate(
&config, &attribs, &m_transportTimer);
if (!NT_SUCCESS(status))
if (!m_transport->Frames().GetMaxFrameSize())
{
DEBUG_ERROR_HR(status, "Timer creation failed");
if (!InitializeTransport() || !m_transport->Setup(alignSize))
return false;
WDF_TIMER_CONFIG config;
WDF_TIMER_CONFIG_INIT_PERIODIC(&config,
[](WDFTIMER timer) -> void
{
WDFOBJECT parent = WdfTimerGetParentObject(timer);
auto wrapper = WdfObjectGet_CDeviceContextWrapper(parent);
wrapper->context->TransportTimer();
},
10);
config.AutomaticSerialization = FALSE;
/**
* Documentation states that Dispatch is not available under UMDF,
* however using Passive returns a not-supported error and Dispatch works.
*/
WDF_OBJECT_ATTRIBUTES attribs;
WDF_OBJECT_ATTRIBUTES_INIT(&attribs);
attribs.ParentObject = m_wdfDevice;
attribs.ExecutionLevel = WdfExecutionLevelDispatch;
NTSTATUS status = WdfTimerCreate(
&config, &attribs, &m_transportTimer);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR_HR(status, "Timer creation failed");
return false;
}
WdfTimerStart(m_transportTimer, WDF_REL_TIMEOUT_IN_MS(10));
}
IInputTransport * input = m_transport->Input();
if (input && !input->Start(g_inputPipeServer))
{
DEBUG_ERROR("Failed to start input transport");
return false;
}
WdfTimerStart(m_transportTimer, WDF_REL_TIMEOUT_IN_MS(10));
return true;
}