struct CameraThirdData_t
{
    float   m_flPitch;
    float   m_flYaw;
    float   m_flDist;
    float   m_flLag;
    Vector  m_vecHullMin;
    Vector  m_vecHullMax;
};

class CInput
{
public:
    // Initialization/shutdown of the subsystem
    virtual void        Init_All( void ) = 0;
    virtual void        Shutdown_All( void ) = 0;
    // Latching button states
    virtual int         GetButtonBits( int ) = 0;
    // Create movement command
    virtual void        CreateMove ( int sequence_number, float input_sample_frametime, bool active ) = 0;
    virtual void        ExtraMouseSample( float frametime, bool active ) = 0;
    virtual bool        WriteUsercmdDeltaToBuffer( bf_write *buf, int from, int to, bool isnewcommand ) = 0;
    virtual void        EncodeUserCmdToBuffer( bf_write& buf, int slot ) = 0;
    virtual void        DecodeUserCmdFromBuffer( bf_read& buf, int slot ) = 0;

    virtual CUserCmd    *GetUserCmd( int sequence_number ) = 0;

    virtual void        MakeWeaponSelection( C_BaseCombatWeapon *weapon ) = 0;

    // Retrieve key state
    virtual float       KeyState ( kbutton_t *key ) = 0;
    // Issue key event
    virtual int         KeyEvent( int eventcode, ButtonCode_t keynum, const char *pszCurrentBinding ) = 0;
    // Look for key
    virtual kbutton_t   *FindKey( const char *name ) = 0;

    // Issue commands from controllers
    virtual void        ControllerCommands( void ) = 0;
    // Extra initialization for some joysticks
    virtual void        Joystick_Advanced( void ) = 0;
    virtual void        Joystick_SetSampleTime( float frametime ) = 0;
    virtual void        IN_SetSampleTime( float frametime ) = 0;

    // Accumulate mouse delta
    virtual void        AccumulateMouse( void ) = 0;
    // Activate/deactivate mouse
    virtual void        ActivateMouse( void ) = 0;
    virtual void        DeactivateMouse( void ) = 0;

    // Clear mouse state data
    virtual void        ClearStates( void ) = 0;
    // Retrieve lookspring setting
    virtual float       GetLookSpring( void ) = 0;

    // Retrieve mouse position
    virtual void        GetFullscreenMousePos( int *mx, int *my, int *unclampedx = 0, int *unclampedy = 0 ) = 0;
    virtual void        SetFullscreenMousePos( int mx, int my ) = 0;
    virtual void        ResetMouse( void ) = 0;
    virtual float       GetLastForwardMove( void ) = 0;
    virtual float       Joystick_GetForward( void ) = 0;
    virtual float       Joystick_GetSide( void ) = 0;
    virtual float       Joystick_GetPitch( void ) = 0;
    virtual float       Joystick_GetYaw( void ) = 0;

    // Third Person camera ( TODO/FIXME:  Move this to a separate interface? )
    virtual void        CAM_Think( void ) = 0;
    virtual int         CAM_IsThirdPerson( void ) = 0;
    virtual void        CAM_ToThirdPerson(void) = 0;
    virtual void        CAM_ToFirstPerson(void) = 0;
    virtual void        CAM_StartMouseMove(void) = 0;
    virtual void        CAM_EndMouseMove(void) = 0;
    virtual void        CAM_StartDistance(void) = 0;
    virtual void        CAM_EndDistance(void) = 0;
    virtual int         CAM_InterceptingMouse( void ) = 0;

    // orthographic camera info ( TODO/FIXME:  Move this to a separate interface? )
    virtual void        CAM_ToOrthographic() = 0;
    virtual bool        CAM_IsOrthographic() const = 0;
    virtual void        CAM_OrthographicSize( float& w, float& h ) const = 0;

#if defined( HL2_CLIENT_DLL )
    // IK back channel info
    virtual void        AddIKGroundContactInfo( int entindex, float minheight, float maxheight ) = 0;
#endif

    virtual void        LevelInit( void ) = 0;

    // Causes an input to have to be re-pressed to become active
    virtual void        ClearInputButton( int bits ) = 0;

    virtual void        CAM_SetCameraThirdData( CameraThirdData_t *pCameraData, const QAngle &vecCameraOffset ) = 0;
    virtual void        CAM_CameraThirdThink( void ) = 0;

    virtual bool        EnableJoystickMode() = 0;
};