gamepad_key

gamepad_key.gml

//on game initialization, call it only once!
globalvar gamepad_key, __gp;
gamepad_key = -1;
__gp[15] = gp_face1;
__gp[14] = gp_face2;
__gp[13] = gp_face3;
__gp[12] = gp_face4;
__gp[11] = gp_shoulderl;
__gp[10] = gp_shoulderlb;
__gp[9] = gp_shoulderr;
__gp[8] = gp_shoulderrb;
__gp[7] = gp_select;
__gp[6] = gp_start;
__gp[5] = gp_stickl;
__gp[4] = gp_stickr;
__gp[3] = gp_padu;
__gp[2] = gp_padd;
__gp[1] = gp_padl;
__gp[0] = gp_padr;

// on step event
gamepad_key = -1;
var i;
for(i=0; i<16; i++) {
  if gamepad_button_check(0, __gp[i]) gamepad_key = i;
}

// usage:
switch(gamepad_key) {
  case gp_face1: ... break;
}