GameInput 读取

HRESULT GetCurrentReading(
    _In_ GameInputKind inputKind,
    _In_opt_ IGameInputDevice * device,
    _COM_Outptr_ IGameInputReading ** reading);

HRESULT GetNextReading(
    _In_ IGameInputReading * referenceReading,
    _In_ GameInputKind inputKind,
    _In_opt_ IGameInputDevice * device,
    _COM_Outptr_ IGameInputReading ** reading);

HRESULT GetPreviousReading(
    _In_ IGameInputReading * referenceReading,
    _In_ GameInputKind inputKind,
    _In_opt_ IGameInputDevice * device,
    _COM_Outptr_ IGameInputReading ** reading);

typedef enum GameInputKind
{
    GameInputKindUnknown         = 0x00000000,
    GameInputKindRawDeviceReport = 0x00000001,
    GameInputKindController      = 0x00000002,
    GameInputKindKeyboard        = 0x00000004,
    GameInputKindMouse           = 0x00000008,
    GameInputKindTouch           = 0x00000100,
    GameInputKindMotion          = 0x00001000,
    GameInputKindArcadeStick     = 0x00010000,
    GameInputKindFlightStick     = 0x00020000,
    GameInputKindGamepad         = 0x00040000,
    GameInputKindRacingWheel     = 0x00080000,
    GameInputKindUiNavigation    = 0x01000000
} GameInputKind;

typedef struct GameInputGamepadState
{
    GameInputGamepadButtons buttons;
    float leftTrigger;
    float rightTrigger;
    float leftThumbstickX;
    float leftThumbstickY;
    float rightThumbstickX;
    float rightThumbstickY;
} GameInputGamepadState;

IGameInput* g_gameInput = nullptr;
IGameInputDevice* g_gamepad = nullptr;

HRESULT InitializeInput()
{
    return GameInputCreate(&g_gameInput);
}

void ShutdownInput()
{
    if (g_gamepad) g_gamepad->Release();
    if (g_gameInput) g_gameInput->Release();
}

void PollGamepadInput()
{
    // Ask for the latest reading from devices that provide fixed-format
    // gamepad state. If a device has been assigned to g_gamepad, filter
    // readings to just the ones coming from that device. Otherwise, if
    // g_gamepad is null, it will allow readings from any device.
    IGameInputReading * reading;
    if (SUCCEEDED(g_gameInput->GetCurrentReading(GameInputKindGamepad, g_gamepad, &reading)))
    {
        // If no device has been assigned to g_gamepad yet, set it
        // to the first device we receive input from. (This must be
        // the one the player is using because it's generating input.)
        if (!g_gamepad) reading->GetDevice(&g_gamepad);

        // Retrieve the fixed-format gamepad state from the reading.
        GameInputGamepadState state;
        reading->GetGamepadState(&state);
        reading->Release();

        // Application-specific code to process the gamepad state goes here.
    }

    // If an error is returned from GetCurrentReading(), it means the
    // gamepad we were reading from has disconnected. Reset the
    // device pointer, and go back to looking for an active gamepad.
    else if (g_gamepad)
    {
        g_gamepad->Release();
        g_gamepad = nullptr;
    }
}