Manpages - SDL_GetModState.3

SDL_GetModState - Get the state of modifier keys.

#include “SDL.h”

SDLMod SDL_GetModState*(*void);

Returns the current state of the modifier keys (CTRL, ALT, etc.).

The return value can be an OR’d combination of the SDLMod enum.

SDLMod

    typedef enum {
      KMOD_NONE  = 0x0000,
      KMOD_LSHIFT= 0x0001,
      KMOD_RSHIFT= 0x0002,
      KMOD_LCTRL = 0x0040,
      KMOD_RCTRL = 0x0080,
      KMOD_LALT  = 0x0100,
      KMOD_RALT  = 0x0200,
      KMOD_LMETA = 0x0400,
      KMOD_RMETA = 0x0800,
      KMOD_NUM   = 0x1000,
      KMOD_CAPS  = 0x2000,
      KMOD_MODE  = 0x4000,
    } SDLMod;

SDL also defines the following symbols for convenience:

    #define KMOD_CTRL (KMOD_LCTRL|KMOD_RCTRL)
    #define KMOD_SHIFT  (KMOD_LSHIFT|KMOD_RSHIFT)
    #define KMOD_ALT  (KMOD_LALT|KMOD_RALT)
    #define KMOD_META (KMOD_LMETA|KMOD_RMETA)

SDL_GetKeyState