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Waveform/dutyCycle

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rnentjes
2024-06-18 17:41:22 +02:00
parent 94dec1f636
commit 945f4bb016
3 changed files with 76 additions and 18 deletions
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61
audio-worklet/src/jsMain/kotlin/nl/astraeus/vst/chip/ChipProcessor.kt
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@@ -49,6 +49,13 @@ class PlayingNote(
var actualVolume = 0f
}
enum class Waveform {
SINE,
SQUARE,
TRIANGLE,
SAWTOOTH
}
@ExperimentalJsExport
@JsExport
class VstChipProcessor : AudioWorkletProcessor() {
@@ -57,6 +64,8 @@ class VstChipProcessor : AudioWorkletProcessor() {
0
)
}
var waveform = Waveform.SINE.ordinal
var dutyCycle = 0.5
init {
this.port.onmessage = ::handleMessage
@@ -117,6 +126,27 @@ class VstChipProcessor : AudioWorkletProcessor() {
noteOff(note)
}
}
0xc9 -> {
if (bytes.length >= 1) {
val waveform = bytes[1]
if (waveform < 4) {
this.waveform = waveform
}
}
}
0xb0 -> {
if (bytes.length == 3) {
val knob = bytes[1]
val value = bytes[2]
when(knob) {
0x4a -> {
dutyCycle = value / 127.0
}
}
}
}
}
}
}
@@ -175,20 +205,39 @@ class VstChipProcessor : AudioWorkletProcessor() {
note.releaseSamples--
targetVolume *= (note.releaseSamples / 10000f)
}
note.actualVolume += (targetVolume - note.actualVolume) * 0.005f
note.actualVolume += (targetVolume - note.actualVolume) * 0.001f
if (note.state == NoteState.RELEASED && note.actualVolume <= 0) {
note.state = NoteState.OFF
}
left[i] = left[i] + sin(note.cycleOffset * PI2).toFloat() * note.actualVolume * 0.3f
right[i] = right[i] + sin(note.cycleOffset * PI2).toFloat() * note.actualVolume * 0.3f
val cycleOffset = note.cycleOffset
//left[i] = left[i] + if (note.cycleOffset < 0.5) { 0.3f } else { -0.3f } * note.actualVolume //sin(note.cycleOffset * PI2).toFloat() * note.actualVolume * 0.3f
//right[i] = right[i] + if (note.cycleOffset < 0.5) { 0.3f } else { -0.3f } * note.actualVolume //sin(note.cycleOffset * PI2).toFloat() * note.actualVolume * 0.3f
val waveValue: Float = when (waveform) {
0 -> {
sin(cycleOffset * PI2).toFloat()
}
1 -> {
if (cycleOffset < dutyCycle) { 1f } else { -1f }
}
2 -> when {
cycleOffset < 0.25 -> 4 * cycleOffset
cycleOffset < 0.75 -> 2 - 4 * cycleOffset
else -> 4 * cycleOffset - 4
}.toFloat()
3 -> {
((cycleOffset * 2f) - 1f).toFloat()
}
else -> {
if (cycleOffset < 0.5) { 1f } else { -1f }
}
}
left[i] = left[i] + waveValue * note.actualVolume * 0.3f
right[i] = right[i] + waveValue * note.actualVolume * 0.3f
note.cycleOffset += sampleDelta
if (note.cycleOffset > 1f) {
if (cycleOffset > 1f) {
note.cycleOffset -= 1f
}
}