diff options
Diffstat (limited to 'internal/generator/templates/shared/shared.js')
| -rw-r--r-- | internal/generator/templates/shared/shared.js | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/internal/generator/templates/shared/shared.js b/internal/generator/templates/shared/shared.js index 7f6192a..70b97e0 100644 --- a/internal/generator/templates/shared/shared.js +++ b/internal/generator/templates/shared/shared.js @@ -387,6 +387,8 @@ var currentPreset = null; var melodyTimer = null; var melodyIndex = 0; + var drumTimer = null; + var drumIndex = 0; function wildifyPreset(base) { if (!base) return base; @@ -645,10 +647,122 @@ clearTimeout(pulseTimer); pulseTimer = null; stopMelody(); + stopDrums(); stopDrones(); stopNoise(); } + // ── drum synthesizer ────────────────────────────────────────────── + + function stopDrums() { + if (drumTimer) { clearTimeout(drumTimer); drumTimer = null; } + drumIndex = 0; + } + + function playDrum(type, preset) { + try { + var c = ctx; + if (!c) return; + var now = c.currentTime; + if (type === 'kick') { + var gBase = preset.gain != null ? preset.gain : 0.08; + var osc = c.createOscillator(); + var g = c.createGain(); + osc.connect(g); + g.connect(masterGain); + osc.frequency.setValueAtTime(150, now); + osc.frequency.exponentialRampToValueAtTime(40, now + 0.12); + g.gain.setValueAtTime(Math.min(gBase * 5, 0.6), now); + g.gain.exponentialRampToValueAtTime(0.001, now + 0.12); + osc.start(now); + osc.stop(now + 0.13); + } else if (type === 'snare') { + var gBase = preset.gain != null ? preset.gain : 0.08; + var osc = c.createOscillator(); + var g1 = c.createGain(); + osc.type = 'triangle'; + osc.frequency.setValueAtTime(250, now); + osc.connect(g1); + g1.connect(masterGain); + g1.gain.setValueAtTime(Math.min(gBase * 3, 0.4), now); + g1.gain.exponentialRampToValueAtTime(0.001, now + 0.1); + osc.start(now); + osc.stop(now + 0.11); + // snap noise burst + var ns = c.createBufferSource(); + var bs = 2 * c.sampleRate; + var buf = c.createBuffer(1, bs, c.sampleRate); + var d = buf.getChannelData(0); + for (var i = 0; i < bs; i++) { d[i] = Math.random() * 2 - 1; } + ns.buffer = buf; + var g2 = c.createGain(); + var bp = c.createBiquadFilter(); + bp.type = 'bandpass'; + bp.frequency.value = 2000; + bp.Q.value = 1; + ns.connect(bp); + bp.connect(g2); + g2.connect(masterGain); + g2.gain.setValueAtTime(Math.min(gBase * 5, 0.6), now); + g2.gain.exponentialRampToValueAtTime(0.001, now + 0.08); + ns.start(now); + ns.stop(now + 0.09); + } else if (type === 'hat') { + var gBase = preset.gain != null ? preset.gain : 0.08; + var ns = c.createBufferSource(); + var bs = 2 * c.sampleRate; + var buf = c.createBuffer(1, bs, c.sampleRate); + var d = buf.getChannelData(0); + for (var i = 0; i < bs; i++) { d[i] = Math.random() * 2 - 1; } + ns.buffer = buf; + var g2 = c.createGain(); + var hp = c.createBiquadFilter(); + hp.type = 'highpass'; + hp.frequency.value = 7000; + ns.connect(hp); + hp.connect(g2); + g2.connect(masterGain); + g2.gain.setValueAtTime(Math.min(gBase * 2, 0.25), now); + g2.gain.exponentialRampToValueAtTime(0.001, now + 0.04); + ns.start(now); + ns.stop(now + 0.05); + } else if (type === 'clap') { + var gBase = preset.gain != null ? preset.gain : 0.08; + // Reverb-y broadband snap + var ns = c.createBufferSource(); + var bs = c.sampleRate * 0.15; + var buf = c.createBuffer(1, bs, c.sampleRate); + var d = buf.getChannelData(0); + for (var i = 0; i < bs; i++) { d[i] = Math.random() * 2 - 1; } + ns.buffer = buf; + var g2 = c.createGain(); + g2.gain.setValueAtTime(Math.min(gBase * 3, 0.35), now); + g2.gain.exponentialRampToValueAtTime(0.001, now + 0.15); + ns.connect(g2); + g2.connect(masterGain); + ns.start(now); + ns.stop(now + 0.16); + } + } catch (_) {} + } + + function scheduleDrums(preset, firstDelayMs) { + if (!isPlaying || !preset || !preset.drums || preset.drums.length === 0) return; + var delay = firstDelayMs != null ? firstDelayMs : 0; + drumTimer = setTimeout(function() { + if (!isPlaying) return; + var beat = preset.drums[drumIndex]; + if (beat !== '_') { + playDrum(beat, preset); + } + drumIndex = (drumIndex + 1) % preset.drums.length; + var beatDur = preset.bpm ? (60000.0 / preset.bpm / 4.0) : 250.0; // 1 beat = 1/16th note at BPM + scheduleDrums(preset, beatDur); + }, delay); + } + + // ── drum synthesizer end ──────────────────────────────────────── + function startEngine() { var preset = getPreset(); if (!preset) return; @@ -669,6 +783,7 @@ startDrones(preset); startNoise(preset); schedulePulse(); + scheduleDrums(preset, 0); // masterGain is a binary gate: open it quickly (50 ms) so the // first scheduled notes are not swallowed by a long ramp. // preset.attack controls per-note envelopes, not the gate. |