G2 support

src/core/Input.lua

@@ -32,6 +32,25 @@ local STICK_OFF = 0.3
 
 -- Raw joystick defaults + NX overrides live in src/core/GamepadMap.lua
 -- (see RAW_BUTTON_BINDINGS / NX_RAW_BUTTON_BINDINGS and #620 / #632).
+--
+-- SELECT ON A PLAYSTATION PAD, checked rather than assumed.  There is no
+-- button called "select" in SDL's game-controller vocabulary: the small
+-- left-hand menu button is `back` on every family, and GamepadMap's
+-- DEFAULT_GAMEPAD_BINDINGS maps it to GB SELECT.  The DualSense's CREATE
+-- button (and the DualShock 4's SHARE) is that button -- the controller
+-- database LOVE 11.5 ships spells the DualSense row
+-- "PS5 Controller,a:b1,b:b2,back:b8,...,misc1:b13,start:b9" -- so a
+-- recognized pad delivers it here as gamepadpressed(_, "back") and needs no
+-- entry of its own.  What it also has, and what LOVE 11.x has no name for at
+-- all, is the TOUCHPAD click (SDL_CONTROLLER_BUTTON_TOUCHPAD) and the mute
+-- key (`misc1`): neither reaches love.gamepadpressed, so neither can be bound,
+-- and a player reaching for the touchpad expecting SELECT will find nothing.
+-- Not a mapping this file can add -- the event never arrives.
+--
+-- An unrecognized PlayStation pad falls to the raw path instead, where SHARE /
+-- CREATE is generic-HID button 9 and RAW_BUTTON_BINDINGS[9] is already
+-- "select".  Both roads reach SELECT; the one road that did not was Gold's,
+-- where src/core/Game2.lua used to answer `back` with love.event.quit().
 
 local HAT_DIRECTIONS = {
   u = { "up" }, d = { "down" }, l = { "left" }, r = { "right" },