sound and other misc fixes

sound.lua

@@ -0,0 +1,47 @@
+-- Central sound-effect registry. One preloaded Source per named effect; the game
+-- calls Sound.play("name") to (re)trigger it. Ambient static + music live in
+-- main.lua's _initSounds; this covers the one-shot gameplay/UI feedback.
+--
+-- Top level does NO audio calls on purpose: requiring this under the test love
+-- stub (which never runs Sound.init) must be side-effect free. Until Sound.init
+-- runs, Sound.sfx is empty and Sound.play is a harmless no-op.
+Sound = {}
+
+Sound.sfx = {}      -- name -> Source
+Sound.jabbers = {}  -- pool of npc chatter Sources, picked at random
+
+local function load(path)
+	return love.audio.newSource(path, "static")
+end
+
+function Sound.init()
+	Sound.sfx = {
+		playerMove    = load("sounds/player_move.ogg"),
+		switchFail    = load("sounds/switch_fail.wav"),
+		switchSuccess = load("sounds/switch_success.wav"),
+		doorUnlock    = load("sounds/door_unlock.ogg"),
+		levelChange   = load("sounds/level_change.ogg"),
+		uiButton      = load("sounds/ui/button.wav"),
+	}
+	Sound.jabbers = {
+		load("sounds/jabber_1.ogg"),
+		load("sounds/jabber_2.ogg"),
+	}
+end
+
+-- Restart-and-play a named effect. A static Source only plays one instance at a
+-- time, so stopping first makes rapid retriggers (e.g. mashing move) audible.
+function Sound.play(name)
+	local src = Sound.sfx[name]
+	if not src then return end
+	src:stop()
+	src:play()
+end
+
+-- Pick a random npc jabber clip and play it. Used when a Dialogable starts talking.
+function Sound.jabber()
+	if #Sound.jabbers == 0 then return end
+	local src = Sound.jabbers[love.math.random(#Sound.jabbers)]
+	src:stop()
+	src:play()
+end