Add WIP sound generation

src/audio/garden-audio-music.ts

@@ -0,0 +1,52 @@
+import { clamp } from '../utils/clamp';
+import { VibePreset } from '../vibes';
+import {
+  GardenAudioChord,
+  GardenAudioConfig,
+  GardenAudioVibeProfile,
+} from './garden-audio-config';
+import { GardenAudioColorIndex } from './garden-audio-types';
+
+export const normalizeColorIndex = (index: number): GardenAudioColorIndex =>
+  Math.max(0, Math.min(2, Math.round(index))) as GardenAudioColorIndex;
+
+export const clampMidi = (midi: number, min: number, max: number): number =>
+  Math.round(clamp(midi, min, max));
+
+export const getVibeProfile = (
+  config: GardenAudioConfig,
+  vibe: VibePreset
+): GardenAudioVibeProfile =>
+  config.vibes[vibe.id] ??
+  config.vibes[config.fallbackVibeId] ??
+  Object.values(config.vibes)[0];
+
+export const getChordAtStep = (
+  config: GardenAudioConfig,
+  profile: GardenAudioVibeProfile,
+  stepIndex: number
+): GardenAudioChord => {
+  const barIndex = Math.floor(stepIndex / config.rhythm.stepsPerBar);
+  return profile.progression[barIndex % profile.progression.length];
+};
+
+export const getChordIntervals = (
+  chord: GardenAudioChord,
+  openVoicing: boolean
+): Array<number> => {
+  if (openVoicing) {
+    return chord.quality === 'major' ? [0, 7, 12, 16] : [0, 7, 12, 15];
+  }
+
+  return chord.quality === 'major' ? [0, 4, 7, 12, 16] : [0, 3, 7, 12, 15];
+};
+
+export const degreeToSemitone = (
+  profile: GardenAudioVibeProfile,
+  degree: number
+): number => {
+  const scaleIndex =
+    ((degree % profile.scale.length) + profile.scale.length) % profile.scale.length;
+  const octave = Math.floor(degree / profile.scale.length);
+  return profile.scale[scaleIndex] + octave * 12;
+};