SDL2: A and B buttons swapped on Switch Pro Controller

[DJtheMan2101]

The current profile for the Nintendo Switch Pro Controller on the SDL2 controller driver (sdl2/Nintendo Switch Pro Controller.cfg) appears to have the inputs for RetroPad-A and RetroPad-B swapped, which can be seen easily enough from Remote RetroPad. The Pro Controller's A (right face) button maps to RetroPad-B (bottom), and Pro Controller-B (bottom) maps to RetroPad-A (right).

The issue does not affect any other buttons, and all the labels are in the correct positions (so only the inputs themselves are swapped). Setting input_a_btn = "0" (instead of 1) and input_b_btn = "1" (instead of 0) fixes the issue.

Tested on macOS Sonoma 14.7.1 with RetroArch 1.19.1 (nightly 3d8c981ac). I first noticed it on a self-compiled Linux build from June 2024. Maybe a recent SDL2 update swapped the button mappings?

[davidhedlund]

Hello! I submitted the PR quite some time ago:

• [READY] sdl2: Update Nintendo Switch Pro Controller.cfg #1156

Nintendo Switch Pro Controller (old).cfg: Flatpak, SDL2, Linux 5.15:

input_a_btn = "1"
input_b_btn = "0"
input_x_btn = "3"
input_y_btn = "2"

Nintendo Switch Pro Controller.cfg: Flatpak, SDL2, Linux 5.16:

input_a_btn = "0"
input_b_btn = "1"
input_x_btn = "2"
input_y_btn = "3"

So this specifically affects the Nintendo Switch Pro Controller, as its updated SDL2 profile now supersedes the old fallback autoconfig for the same device. In other words, the newly enabled SDL2 autoconfig likely used the configuration structure or mappings originally defined in the fallback autoconfig, before the PR.