Add Build 42 World Atmosphere Pack mod

Contents/mods/WorldAtmospherePack/42/media/lua/client/WorldAtmospherePack.lua

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+-- All timing and playback happen on the player's client; no world sound is emitted.
+local SOUND_NAME = "WorldAtmosphereCue"
+local MIN_WAIT_MINUTES = 30
+local MAX_WAIT_MINUTES = 60
+local CHECK_INTERVAL_MS = 1000
+
+local nextPlayAt = nil
+local lastCheckAt = 0
+local playingId = nil
+local tickRegistered = false
+local nativeMusicMuted = false
+
+local function scheduleNext(now)
+    nextPlayAt = now + ZombRandBetween(MIN_WAIT_MINUTES, MAX_WAIT_MINUTES + 1) * 60000
+end
+
+local function onTick()
+    if not getPlayer() then return end
+
+    local now = getTimestampMs()
+    if now - lastCheckAt < CHECK_INTERVAL_MS then return end
+    lastCheckAt = now
+
+    local soundManager = getSoundManager()
+    local emitter = soundManager:getUIEmitter()
+    if playingId then
+        if emitter:isPlaying(playingId) then
+            soundManager:setMusicVolume(0)
+            emitter:setVolume(playingId, getCore():getOptionMusicVolume() / 10)
+            return
+        end
+        playingId = nil
+        if nativeMusicMuted then
+            soundManager:setMusicVolume(getCore():getOptionMusicVolume() / 10)
+            nativeMusicMuted = false
+        end
+        scheduleNext(now)
+        return
+    end
+
+    if not nextPlayAt or now < nextPlayAt then return end
+
+    -- The script sound selects a random clip. The UI emitter needs explicit
+    -- per-sound volume to follow the game's music slider.
+    playingId = emitter:playSound(SOUND_NAME)
+    nextPlayAt = nil
+    if playingId and playingId ~= 0 then
+        emitter:set3D(playingId, false)
+        emitter:setVolume(playingId, getCore():getOptionMusicVolume() / 10)
+        soundManager:setMusicVolume(0)
+        nativeMusicMuted = true
+    else
+        playingId = nil
+        scheduleNext(now)
+    end
+end
+
+local function onDisconnect()
+    local soundManager = getSoundManager()
+    if playingId then
+        soundManager:getUIEmitter():stopSound(playingId)
+    end
+    if nativeMusicMuted then
+        soundManager:setMusicVolume(getCore():getOptionMusicVolume() / 10)
+        nativeMusicMuted = false
+    end
+    playingId = nil
+    nextPlayAt = nil
+end
+
+local function onGameStart()
+    scheduleNext(getTimestampMs())
+    if not tickRegistered then
+        Events.OnTick.Add(onTick)
+        tickRegistered = true
+    end
+end
+
+Events.OnGameStart.Add(onGameStart)
+Events.OnDisconnect.Add(onDisconnect)
+Events.OnMainMenuEnter.Add(onDisconnect)

Contents/mods/WorldAtmospherePack/42/media/scripts/WorldAtmosphereSounds.txt

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+module WorldAtmospherePack
+{
+    sound WorldAtmosphereCue
+    {
+        category = Music,
+        master = Music,
+        is3D = false,
+        loop = false,
+        clip
+        {
+            file = media/sound/WorldAtmospherePack/track1.ogg,
+            volume = 1.0,
+        }
+        clip
+        {
+            file = media/sound/WorldAtmospherePack/track2.ogg,
+            volume = 1.0,
+        }
+        clip
+        {
+            file = media/sound/WorldAtmospherePack/track3.ogg,
+            volume = 1.0,
+        }
+        clip
+        {
+            file = media/sound/WorldAtmospherePack/track4.ogg,
+            volume = 1.0,
+        }
+        clip
+        {
+            file = media/sound/WorldAtmospherePack/track5.ogg,
+            volume = 1.0,
+        }
+        clip
+        {
+            file = media/sound/WorldAtmospherePack/track6.ogg,
+            volume = 1.0,
+        }
+        clip
+        {
+            file = media/sound/WorldAtmospherePack/track7.ogg,
+            volume = 1.0,
+        }
+        clip
+        {
+            file = media/sound/WorldAtmospherePack/track8.ogg,
+            volume = 1.0,
+        }
+        clip
+        {
+            file = media/sound/WorldAtmospherePack/track9.ogg,
+            volume = 1.0,
+        }
+        clip
+        {
+            file = media/sound/WorldAtmospherePack/track10.ogg,
+            volume = 1.0,
+        }
+        clip
+        {
+            file = media/sound/WorldAtmospherePack/track11.ogg,
+            volume = 1.0,
+        }
+        clip
+        {
+            file = media/sound/WorldAtmospherePack/track12.ogg,
+            volume = 1.0,
+        }
+        clip
+        {
+            file = media/sound/WorldAtmospherePack/track13.ogg,
+            volume = 1.0,
+        }
+        clip
+        {
+            file = media/sound/WorldAtmospherePack/track14.ogg,
+            volume = 1.0,
+        }
+        clip
+        {
+            file = media/sound/WorldAtmospherePack/track15.ogg,
+            volume = 1.0,
+        }
+    }
+}

Contents/mods/WorldAtmospherePack/42/mod.info

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+name=World Atmosphere Pack
+id=WorldAtmospherePack
+description=Subtle additions to the world atmosphere.