fix(input): apply Switch-measured controller fallback

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/switch-development.md

@@ -211,3 +211,26 @@ scripts/build_switch.sh --loose
 shasum -a 256 .bazinga/work/game.love
 ```
 
+## Controller input mapping (NX)
+
+Measured on Switch OLED (`feat/switch-nx`, love-nx `11.5-nx1`, 1280×720). Both `joystickpressed` and `gamepadpressed` fire for Joy-Con; prefer the gamepad path when `joystick:isGamepad()` is true.
+
+| Path | Control | Mapping |
+| ---- | ------- | ------- |
+| `gamepadpressed` | D-pad / left stick | move (via `GamepadMap.DEFAULT_GAMEPAD_BINDINGS`) |
+| `gamepadpressed` | `a` / `b` | GB A / B |
+| `gamepadpressed` | `start` / `back` | Start / Select |
+| `joystickpressed` (raw) | `#1` Nintendo B | GB A |
+| `joystickpressed` (raw) | `#2` Nintendo A | GB B |
+| `joystickpressed` (raw) | `#3` Y | GB B (measured) |
+| `joystickpressed` (raw) | `#4` X | GB A (measured) |
+| `joystickpressed` (raw) | `#9` / `#10` | Select / Start (− / +) |
+
+Implementation: `src/core/GamepadMap.lua` (`NX_RAW_*` tables). Launcher (`RomImporter`) and gameplay (`Input`) share the same converter.
+
+**Opt-in diagnostics:** create an empty `switch-debug.txt` in the save directory; events flush to `switch.log` at ≤1 Hz with build identity (no ROM/save bytes).
+
+**Hardware re-test:** P0-07/08 Joy-Con launcher + naming screen — pending operator after T15 software (T16).
+
+**Suspend/resume audio:** after resume, chip music is stopped to avoid duplicate streams; confirm on hardware during P0-09/10 (T19).
+

src/core/GamepadMap.lua

@@ -16,16 +16,28 @@ GamepadMap.RAW_BUTTON_BINDINGS = {
   [7] = "select", [8] = "start", [9] = "select", [10] = "start",
 }
 
+-- Switch OLED probe 2026-08-01: love.joystickpressed indices (1-based).
+-- Gamepad path still preferred when isGamepad(); raw covers the rest.
+GamepadMap.NX_RAW_BUTTON_BINDINGS = {
+  [1] = "a", [2] = "b",
+  [3] = "b", [4] = "a",
+  [9] = "select", [10] = "start",
+}
+
 -- Raw index -> gamepad button name for RomImporter routing.
 GamepadMap.RAW_TO_GAMEPAD_BUTTON = {
   [1] = "a", [2] = "b",
   [7] = "back", [8] = "start", [9] = "back", [10] = "start",
 }
 
+GamepadMap.NX_RAW_TO_GAMEPAD_BUTTON = {
+  [1] = "a", [2] = "b",
+  [3] = "y", [4] = "x",
+  [9] = "back", [10] = "start",
+}
+
 -- Test hook: force NX raw tables without stubbing love.
 GamepadMap._forceNXForTests = false
-GamepadMap.NX_RAW_BUTTON_BINDINGS = nil
-GamepadMap.NX_RAW_TO_GAMEPAD_BUTTON = nil
 
 function GamepadMap._setForceNXForTests(v)
   GamepadMap._forceNXForTests = not not v
@@ -43,7 +55,7 @@ function GamepadMap.mapGamepadButton(button)
 end
 
 function GamepadMap.mapRawButton(index)
-  if nxActive() and GamepadMap.NX_RAW_BUTTON_BINDINGS then
+  if nxActive() then
     local nx = GamepadMap.NX_RAW_BUTTON_BINDINGS[index]
     if nx then return nx end
   end
@@ -51,7 +63,7 @@ function GamepadMap.mapRawButton(index)
 end
 
 function GamepadMap.mapRawToGamepadButton(index)
-  if nxActive() and GamepadMap.NX_RAW_TO_GAMEPAD_BUTTON then
+  if nxActive() then
     local nx = GamepadMap.NX_RAW_TO_GAMEPAD_BUTTON[index]
     if nx then return nx end
   end

tests/engine/input_nx_raw_map_test.lua

@@ -0,0 +1,22 @@
+-- NX raw fallback indices measured on OLED hardware (SWNX-11).
+package.path = "./?.lua;./?/init.lua;" .. package.path
+if not _G.love then _G.love = require("tests.love_stub") end
+
+local T = require("tests.harness")
+local eq = T.eq
+
+local GamepadMap = require("src.core.GamepadMap")
+
+GamepadMap._setForceNXForTests(true)
+
+-- Phase 0 probe: Y→#3, X→#4; Nintendo B/A at #1/#2.
+eq(GamepadMap.mapRawButton(3), "b", "NX raw Y (#3) maps to GB B")
+eq(GamepadMap.mapRawButton(4), "a", "NX raw X (#4) maps to GB A")
+eq(GamepadMap.mapRawToGamepadButton(3), "y", "NX raw #3 routes to gamepad y")
+eq(GamepadMap.mapRawToGamepadButton(4), "x", "NX raw #4 routes to gamepad x")
+eq(GamepadMap.mapRawButton(9), "select", "NX minus (#9) -> select")
+eq(GamepadMap.mapRawButton(10), "start", "NX plus (#10) -> start")
+
+GamepadMap._setForceNXForTests(false)
+
+T.finish()