Suggestion: Offer alternative "input_face_" variables

It's difficult to remember the position of the face buttons ("A" "B" "X" "Y"). To make it simple to figure out the position and to make it consistent with D-PAD (input_up_btn, input_down_btn, input_left_btn, input_right_btn), I suggest that RA is compatible with an additional set.

Proposed extra set

I recommend that this set is used by default by RetroArch, and its autoconfig file.

input_face_down_btn
input_face_left_btn
input_face_right_btn
input_face_up_btn

input_face_down_btn_label = "Face Button Down"
input_face_left_btn_label = "Face Button Left"
input_face_right_btn_label = "Face Button Right"
input_face_up_btn_label = "Face Button Up"

input_face_down_axis
input_face_left_axis
input_face_right_axis
input_face_up_axis

input_face_down_axis_label = "Face Button Down"
input_face_left_axis_label = "Face Button Left"
input_face_right_axis_label = "Face Button Right"
input_face_up_axis_label = "Face Button Up"

Current set

The (old) set can still be used in RA.

input_b_btn
input_y_btn
input_a_btn
input_x_btn

input_b_btn_label = "B"
input_y_btn_label = "Y"
input_a_btn_label = "A"
input_x_btn_label = "X"

input_b_axis
input_y_axis
input_a_axis
input_x_axis

input_b_btn_axis = "B"
input_y_btn_axis = "Y"
input_a_btn_axis = "A"
input_x_btn_axis = "X"

See also

• https://github.com/libretro/RetroArch/issues/16309

Start by tracing RetroArch's input configuration and autoconfig handling for the existing input_a_btn, input_b_btn, input_x_btn, and input_y_btn variables. Compare that path with the proposed input_face_* button and axis names, then verify that the new aliases and labels work while the existing names remain supported.