move scheduler to core + move audioctx to userland

packages/core/examples/repl.html

@@ -0,0 +1,85 @@
+<div style="position: absolute; bottom: 0; right: 0; padding: 4px; width: 100vw; display: flex">
+  <button id="start" style="font-size: 2em">start</button>
+  <button id="stop" style="font-size: 2em">stop</button>
+  <button id="slower" style="font-size: 2em">slower</button>
+  <button id="faster" style="font-size: 2em">faster</button>
+</div>
+<textarea
+  style="font-size: 2em; background: #052b49; color: #fff; height: 100%; width: 100%; outline: none; border: 0"
+  id="text"
+  spellcheck="false"
+>
+Loading...</textarea
+>
+<script type="module">
+  document.body.style = 'margin: 0';
+  import * as strudel from '@strudel.cycles/core';
+
+  const { cat, State, TimeSpan, Scheduler, getPlayableNoteValue, getFreq } = strudel;
+  Object.assign(window, strudel); // add strudel to eval scope
+
+  const ctx = new AudioContext();
+  const scheduler = new Scheduler({
+    // audioContext: getAudioContext(),
+    interval: 0.1,
+    onTrigger: (hap, time, duration) => {
+      const freq = getFrequency(hap);
+      const osc = ctx.createOscillator();
+      const gain = 0.2;
+      osc.frequency.value = freq;
+      osc.type = 'triangle';
+      const onset = ctx.currentTime + time;
+      const offset = onset + duration;
+      const attack = 0.05;
+      const release = 0.05;
+      osc.start(onset);
+      osc.stop(offset + release);
+
+      const g = ctx.createGain();
+      g.gain.setValueAtTime(gain, onset);
+      g.gain.linearRampToValueAtTime(gain, onset + attack);
+      g.gain.setValueAtTime(gain, offset - release);
+      g.gain.linearRampToValueAtTime(0, offset);
+      osc.connect(g);
+      g.connect(ctx.destination);
+    },
+  });
+
+  let initialCode = `sequence(1,2).mul(55/2) // frequencies
+  .mul(slowcat(1,2))
+  .mul(slowcat(1,3/2,4/3,5/3).slow(8))
+  .fast(3)
+  .freq()
+  .velocity(.5)
+  .s('sawtooth')
+  .cutoff(800)
+  .out()
+  `;
+
+  try {
+    const base64 = decodeURIComponent(window.location.href.split('#')[1]);
+    initialCode = atob(base64);
+  } catch (err) {
+    console.warn('failed to decode', err);
+  }
+  const input = document.getElementById('text');
+  input.value = initialCode;
+  const evaluate = () => {
+    try {
+      const pattern = eval(input.value);
+      scheduler.setPattern(pattern);
+      window.location.hash = '#' + encodeURIComponent(btoa(input.value)); // update url hash
+    } catch (err) {
+      console.warn(err);
+    }
+  };
+  evaluate();
+  input.addEventListener('input', () => evaluate());
+  document.getElementById('start').addEventListener('click', () => {
+    ctx.resume();
+    scheduler.start();
+  });
+  document.getElementById('stop').addEventListener('click', () => scheduler.stop());
+  document.getElementById('slower').addEventListener('click', () => scheduler.setCps(scheduler.cps - 0.1));
+  document.getElementById('faster').addEventListener('click', () => scheduler.setCps(scheduler.cps + 0.1));
+</script>