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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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55
idd/LGIdd/ipc/CInputPipeServer.h
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@@ -22,11 +22,13 @@
#include "CPipeEndpoint.h"
#include "InputPipeProtocol.h"
#include "input/IInputSink.h"
#include <atomic>
#include <stddef.h>
#include <stdint.h>
class CInputPipeServer : private IPipeEndpointHandler
class CInputPipeServer : public IInputSink, private IPipeEndpointHandler
{
public:
~CInputPipeServer() { DeInit(); }
@@ -34,34 +36,61 @@ public:
bool Init();
void DeInit();
// Mouse buttons use LGInputMouseButton bits. Wheel values are -127..127.
bool IsAvailable() const override
{
return (m_state.load(std::memory_order_acquire) & 1) != 0;
}
uint64_t GetGeneration() const override
{
return m_state.load(std::memory_order_acquire);
}
// Mouse buttons use LGInputMouseButton bits. Values outside the pipe report
// ranges are split into multiple reports without losing motion.
bool SendMouseRelative(
_In_ int16_t deltaX,
_In_ int16_t deltaY,
_In_ int8_t wheel,
_In_ uint8_t buttons);
_In_ int32_t deltaX,
_In_ int32_t deltaY,
_In_ int32_t wheel,
_In_ uint32_t buttons) override;
// Absolute coordinates are normalized to 0..32767 on each axis.
bool SendMouseAbsolute(
_In_range_(0, LG_INPUT_MOUSE_ABSOLUTE_MAX) uint16_t x,
_In_range_(0, LG_INPUT_MOUSE_ABSOLUTE_MAX) uint16_t y,
_In_ int8_t wheel,
_In_ uint8_t buttons);
_In_ int32_t wheel,
_In_ uint32_t buttons) override;
// Keys are USB HID Keyboard/Keypad usage IDs; zero marks an empty slot.
bool SendKeyboard(
_In_ uint8_t modifiers,
_In_reads_(LG_INPUT_KEYBOARD_KEY_COUNT) const uint8_t * keys);
_In_reads_(LG_INPUT_KEYBOARD_KEY_COUNT) const uint8_t * keys) override;
bool Reset() override;
bool IsConnected() const { return m_endpoint.IsConnected(); }
private:
bool SendMessage(
bool SendMessageLocked(
_In_ LGInputPipeMessageType type,
_In_reads_bytes_(size) const void * payload,
_In_ size_t size);
bool ResetLocked();
void Invalidate();
void OnPipeConnected() override;
void OnPipeDisconnected() override;
bool OnPipeMessage(const void * message, size_t size) override;
CPipeEndpoint m_endpoint;
SRWLOCK m_sendLock = SRWLOCK_INIT;
uint64_t m_sequence = 0;
CPipeEndpoint m_endpoint;
// Odd states are available. Each endpoint transition advances the state.
std::atomic<uint64_t> m_state { 0 };
SRWLOCK m_sendLock = SRWLOCK_INIT;
uint64_t m_sequence = 0;
enum class MouseMode
{
NONE,
RELATIVE,
ABSOLUTE,
};
MouseMode m_mouseMode = MouseMode::NONE;
bool m_absoluteValid = false;
uint16_t m_absoluteX = 0;
uint16_t m_absoluteY = 0;
};
extern CInputPipeServer g_inputPipeServer;