# game.shared KESSREL LINE's one shared surface: the game's constants (world frame, palette, fonts, unit kinds and index ranges, regiments, stances, abilities, waves), the event bus every slice talks over, the `battle` state the sim writes and everyone reads, the `audio` and `screens` contracts other slices bind, and the spoken lines with their text. ```lua local K = require("game.shared") K.on("battle.wave", function(p) print(p.wave) end) K.emit("cmd.move", { ids = { 1, 2 }, x = 0, z = 40 }) K.say("wave_1") ``` The design spec at `/zero/source/design/spec.md` says which slice owns which part of it. Nothing here writes a unit, a screen or a sound; it is the place they agree.

# audio.dsp The arithmetic every sound in KESSREL LINE is made of: oscillators (sine, triangle, a reedy partial stack), white noise, one-pole and state-variable filters, soft clipping, normalisation, a Schroeder reverb for the canyon and a single hard slapback off its wall, the two loop-seam tools a bed is written with, and `bake`, which encodes raw interleaved f32 PCM into a `.soundClip`. Pure CPU: no network, no credit, no service. `audio.bank` and `audio.voicebank` are its only consumers. ```lua local D = require("audio.dsp") local n = 48000 // 2 local b = D.mk(n) D.noise(b, n, 48000, D.env(1.0, 0.002, 26)) D.svf(b, n, 48000, 2400, 1.4, "band") D.reverb(b, n, 48000, 0.3, 0.85) D.normalise(b, n, 0.9) D.bake("a_crack", "audio/clips", b, n, 48000, 1, false) ``` A clip that loops is baked with `loop = true`, which stores it as `codec = "pcm"` and measures `audio.loopSeam` on the payload. `bedBuffer`, `wrapFold` and `cyc` are what make that seam survive: a bed is rendered longer than it plays and folded back over itself, and its tonal layers sit on frequencies that complete a whole number of cycles across the loop. `bake` returns a report rather than raising, so a whole bank bakes and says what failed instead of stopping at the first one. The generator and filter shapes follow `game.vendor.synth` (RED DOT RISING, ZeroMind `d145323d`), re-exported here as a toolkit rather than a fixed bank.