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ProTracker-faithful Funk Repeat emulation

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minjaesong
2026-05-09 03:16:50 +09:00
parent 3c57e33f8f
commit 9f01bdfee9
2 changed files with 27 additions and 13 deletions
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11
TAUD_NOTE_EFFECTS.md
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@@ -1058,11 +1058,10 @@ funk_table[16] = { 0, 5, 6, 7, 8, $A, $B, $D, $10, $13, $16, $1A, $20, $2B, $40,
on every tick (when S $Fxxxx is active with x != 0):
funk_accumulator += funk_length
while funk_accumulator >= $80:
funk_accumulator -= $80
bit = funk_mask[funk_write_pos]
funk_mask[funk_write_pos] = bit XOR 1
funk_write_pos = (funk_write_pos + 1) mod loop_length
if funk_accumulator >= $80: # hard reset, drops residual
funk_accumulator = 0
funk_write_pos = (funk_write_pos + 1) mod loop_length # pre-increment
funk_mask[funk_write_pos] = funk_mask[funk_write_pos] XOR 1
on sample byte read during loop playback:
raw_byte = sample_data[offset_in_loop]
@@ -1072,7 +1071,7 @@ on sample byte read during loop playback:
output_byte = raw_byte
```
`S $F000` clears `funk_accumulator` but leaves `funk_mask` intact (so the accumulated inversion pattern persists until the instrument is reset). On a fresh note or instrument-change event, Taud optionally resets `funk_mask` to all zero; this is a per-implementation choice, but the recommended default is **reset on instrument-change, preserve on pure note retrigger**.
`S $F000` clears `funk_accumulator` but leaves `funk_mask` intact (the accumulated inversion pattern persists). **On every fresh note trigger**, `funk_write_pos` resets to 0 (matching PT2's `n_wavestart = n_loopstart`); `funk_accumulator` and `funk_speed` persist across notes. The `funk_mask` itself is **only cleared on cue-start reset** (i.e. song-start / stop-and-replay) — within a single playback session it accumulates as PT2's destructive in-place edits would, but a clean replay always reproduces the same audio without needing to reload the song from disk.
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