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feat: add setStereoSeparation method to ChiptuneJsPlayer #4

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Merged
DrSnuggles merged 1 commit into from
May 30, 2026
Merged

feat: add setStereoSeparation method to ChiptuneJsPlayer #4

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5 changes: 5 additions & 0 deletions chiptune3.js
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Original file line number Diff line number Diff line change
Expand Up @@ -121,6 +121,11 @@ export class ChiptuneJsPlayer {
setRepeatCount(val) { this.postMsg('repeatCount', val) }
setPitch(val) { this.postMsg('setPitch', val) }
setTempo(val) { this.postMsg('setTempo', val) }
// Live-update the stereo-separation render param (0..200 percent;
// 100 = libopenmpt default, 0 = mono). Also mutates the worklet's
// this.config.stereoSeparation so subsequently-loaded modules
// inherit the value without a reload.
setStereoSeparation(val) { this.postMsg('setStereoSeparation', val) }
setPos(val) { this.postMsg('setPos', val) }
setOrderRow(o,r) { this.postMsg('setOrderRow', {o:o,r:r}) }
setVol(val) { this.gain.gain.value = val }
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9 changes: 9 additions & 0 deletions chiptune3.worklet.js
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Expand Up @@ -139,6 +139,15 @@ class MPT extends AudioWorkletProcessor {
if (!libopenmpt.stackSave || !this.modulePtr) return
libopenmpt._openmpt_module_ctl_set(this.modulePtr, asciiToStack('play.tempo_factor'), asciiToStack(v.toString()))
break
case 'setStereoSeparation': {
// Clamp to [0, 200] (libopenmpt's documented range) and
// fall back to the default 100 on non-finite values.
const n = Number.isFinite(v) ? Math.max(0, Math.min(200, Math.trunc(v))) : 100
this.config.stereoSeparation = n
if (!this.modulePtr) break
libopenmpt._openmpt_module_set_render_param(this.modulePtr, OPENMPT_MODULE_RENDER_STEREOSEPARATION_PERCENT, n)
break
}
case 'selectSubsong':
if (!this.modulePtr) return
libopenmpt._openmpt_module_select_subsong(this.modulePtr, v)
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