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taud: implemented eff W (panbrello)

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minjaesong
2026-04-24 09:15:24 +09:00
parent 1fe966ca09
commit 3d99568359
3 changed files with 68 additions and 4 deletions
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37
TAUD_NOTE_EFFECTS.md
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@@ -1,6 +1,6 @@
# Taud Tracker Effect Command Reference
Taud is a tracker-style music format derived from ScreamTracker 3's pattern command set, extended to 16-bit effect arguments and a 4096-tone equal-temperament pitch grid. This document defines every effect command a Taud engine must implement. Each command entry has three parts: a plain explanation for composers, compatibility notes for converting patterns from ScreamTracker 3 (ST3) or ProTracker (PT), and implementation details for engine writers.
Taud is a tracker-style music format derived from ScreamTracker 3's pattern command set, extended to 16-bit effect arguments and a 4096-tone equal-temperament pitch grid. This document defines every effect command a Taud engine must implement. Each command entry has three parts: a plain explanation for composers, compatibility notes for converting patterns from ScreamTracker 3 (ST3), ImpulseTracker (IT) or ProTracker (PT), and implementation details for engine writers.
---
@@ -493,6 +493,30 @@ A tempo slide's memory slot is separate from the set-tempo path and is private t
---
## W $xxyy — Panbrello (panning vibrato) with speed $xx and depth $yy
**Plain.** Modulates panning with an LFO, symmetrically with H's pitch modulation. `$xx` is LFO speed, `$yy` depth; the waveform is selected by S $4x.
**Compatibility.** IT `Wxy` uses nibbles; convert by nibble-repeat. IT's volume cap is $40; Taud's is $3F — very deep vibrato that would have briefly clipped at $40 in IT may clip slightly earlier in Taud. W has its own memory slot.
**Implementation.** Identical machinery to H with a larger shift to fit the narrower volume range:
```
on row parse (W):
if (arg >> 8) != 0: memory_W.speed = arg >> 8
if (arg & $FF) != 0: memory_W.depth = arg & $FF
on every tick (including tick 0):
sine = ModSinusTable[(lfo_pos >> 2) & $3F]
vol_delta = (sine × memory_W.depth) >> 9
applied_vol = clamp(base_vol + vol_delta, 0, $3F)
lfo_pos = (lfo_pos + memory_W.speed × 4) & $FF
```
Peak at maximum settings: $7F × $FF >> 9 = $3F — the full panning range. Retrigger behaviour tracks the S $4x waveform nibble bit 2: cleared means retrigger on new note, set means preserve LFO position.
---
# The S subcommand family
S is a multiplexing opcode; the **high nibble of the high byte** selects the sub-effect, and the remainder is the sub-argument.
@@ -567,6 +591,17 @@ ProTracker `E5x` maps to Taud `S $2x00` with the same index meaning.
**Implementation.** As for S $3x, but applied to R's separate state (`tremolo_waveform`, `tremolo_retrigger`, and tremolo `lfo_pos`).
---
## S $5x00 — Panbrello LFO waveform
**Plain.** Selects the shape of the panbrello (W) oscillator; value encoding is identical to S $3x.
**Compatibility.** IT `S5x` maps directly.
**Implementation.** As for S $3x, but applied to W's separate state (`panbrello_waveform`, `panbrello_retrigger`, and panbrello `lfo_pos`).
---
## S $80xx — Set channel pan position

2
assets/disk0/tvdos/bin/taut.js
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@@ -174,7 +174,7 @@ const colEffOp = 213
const colEffArg = 231
const colBackPtn = 255
const PITCH_PRESET_IDX = 10123 // TODO read from the Project Data section of the .taud
const PITCH_PRESET_IDX = 240 // TODO read from the Project Data section of the .taud
Number.prototype.hex02 = function() {
return this.toString(16).toUpperCase().padStart(2,'0')

33
tsvm_core/src/net/torvald/tsvm/peripheral/AudioAdapter.kt
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@@ -1088,7 +1088,8 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
// H=0x11 vibrato, I=0x12 tremor, J=0x13 arpeggio,
// K=0x14 K, L=0x15 L, O=0x18 sample offset,
// Q=0x1A retrig, R=0x1B tremolo, S=0x1C subcommands,
// T=0x1D tempo, U=0x1E fine vibrato, V=0x1F global vol).
// T=0x1D tempo, U=0x1E fine vibrato, V=0x1F global vol,
// W=0x20 panbrello).
// K (0x14) and L (0x15) are intentionally no-op in the engine — the
// converter is required to split them into a recall-only H/G plus a
// volume-column slide cell.
@@ -1152,6 +1153,7 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
const val OP_T = 0x1D
const val OP_U = 0x1E
const val OP_V = 0x1F
const val OP_W = 0x20
}
private fun computePlaybackRate(inst: TaudInst, noteVal: Int): Double =
@@ -1241,9 +1243,10 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
}
voice.rowVolume = voice.channelVolume
voice.noteWasCut = false
// Vibrato/tremolo retrigger: reset LFO position when waveform requests it.
// Vibrato/tremolo/panbrello retrigger: reset LFO position when waveform requests it.
if (voice.vibratoRetrig) voice.vibratoLfoPos = 0
if (voice.tremoloRetrig) voice.tremoloLfoPos = 0
if (voice.panbrelloRetrig) voice.panbrelloLfoPos = 0
}
private fun applyVolColumn(voice: Voice, value: Int, sel: Int) {
@@ -1301,6 +1304,7 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
voice.tremorOn = 0
voice.vibratoActive = false
voice.tremoloActive = false
voice.panbrelloActive = false
voice.retrigActive = false
voice.tempoSlideDir = 0
voice.volColSlideUp = 0; voice.volColSlideDown = 0
@@ -1471,6 +1475,13 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
val hi = (rawArg ushr 8) and 0xFF
playhead.globalVolume = hi
}
EffectOp.OP_W -> {
val sp = (rawArg ushr 8) and 0xFF
val dp = rawArg and 0xFF
if (sp != 0) voice.mem.wSpeed = sp
if (dp != 0) voice.mem.wDepth = dp
voice.panbrelloActive = true
}
}
}
@@ -1486,6 +1497,7 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
}
0x3 -> { voice.vibratoWave = x and 3; voice.vibratoRetrig = (x and 4) == 0 }
0x4 -> { voice.tremoloWave = x and 3; voice.tremoloRetrig = (x and 4) == 0 }
0x5 -> { voice.panbrelloWave = x and 3; voice.panbrelloRetrig = (x and 4) == 0 }
0x8 -> {
// S$80xx — full 8-bit pan; arg low byte is the value.
voice.channelPan = arg and 0xFF
@@ -1609,6 +1621,14 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
voice.tremoloLfoPos = (voice.tremoloLfoPos + voice.mem.rSpeed * 4) and 0xFF
}
// Panbrello (W) — modulates panning around base.
if (voice.panbrelloActive) {
val sine = lfoSample(voice.panbrelloLfoPos, voice.panbrelloWave)
val panDelta = (sine * voice.mem.wDepth) shr 9
voice.rowPan = ((voice.channelPan ushr 2) + panDelta).coerceIn(0, 0x3F)
voice.panbrelloLfoPos = (voice.panbrelloLfoPos + voice.mem.wSpeed * 4) and 0xFF
}
// Arpeggio (J) — overrides pitchToMixer for this tick (overlay on basePitch).
if (voice.arpActive) {
val voiceIdx = ts.tickInRow % 3
@@ -1846,6 +1866,9 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
// R (tremolo) — private speed and depth.
var rSpeed: Int = 0
var rDepth: Int = 0
// W (panbrello) — private speed and depth.
var wSpeed: Int = 0
var wDepth: Int = 0
// Private slots
var d: Int = 0
var i: Int = 0
@@ -1907,6 +1930,12 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
var tremoloWave = 0
var tremoloRetrig = true
// Panbrello (W) — uses memW.
var panbrelloActive = false
var panbrelloLfoPos = 0
var panbrelloWave = 0
var panbrelloRetrig = true
// Glissando flag (S$1x).
var glissandoOn = false