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taut: IT note fade

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minjaesong
2026-06-14 19:35:07 +09:00
parent 62fe227b6b
commit af8dd6aea8
5 changed files with 39 additions and 8 deletions
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11
it2taud.py
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@@ -44,7 +44,7 @@ from taud_common import (
TAUD_MAGIC, TAUD_VERSION, TAUD_HEADER_SIZE, TAUD_SONG_ENTRY,
SAMPLEBIN_SIZE, INSTBIN_SIZE, SAMPLEINST_SIZE, SAMPLE_LEN_LIMIT,
PATTERN_ROWS, PATTERN_BYTES, NUM_PATTERNS_MAX, NUM_CUES, CUE_SIZE, NUM_VOICES,
NOTE_NOP, NOTE_KEYOFF, NOTE_CUT, TAUD_C4,
NOTE_NOP, NOTE_KEYOFF, NOTE_CUT, NOTE_NOTEFADE, TAUD_C4,
TOP_NONE, TOP_A, TOP_B, TOP_C, TOP_D, TOP_E, TOP_F, TOP_G, TOP_H, TOP_I,
TOP_J, TOP_K, TOP_L, TOP_M, TOP_N, TOP_O, TOP_P, TOP_Q, TOP_R, TOP_S, TOP_T, TOP_U, TOP_V, TOP_W, TOP_Y,
SEL_SET, SEL_UP, SEL_DOWN, SEL_FINE,
@@ -69,7 +69,7 @@ IT_INST_MAGIC = b'IMPI'
IT_NOTE_OFF = 255
IT_NOTE_CUT = 254
IT_NOTE_FADE = 246 # treated as key-off
IT_NOTE_FADE = 246 # → Taud Note Fade (0x0003): fade by instrument fadeout, sustain kept
IT_ORD_END = 255
IT_ORD_SKIP = 254
@@ -709,8 +709,13 @@ def parse_patterns(data: bytes, h: ITHeader) -> list:
# ── Note encoding (IT linear 0-119 → Taud pitch units) ───────────────────────
def encode_note_it(it_note: int) -> int:
if it_note == IT_NOTE_OFF or it_note == IT_NOTE_FADE:
if it_note == IT_NOTE_OFF:
return NOTE_KEYOFF
if it_note == IT_NOTE_FADE:
# IT "~~~" Note Fade: CHN_NOTEFADE — begins the instrument's volume fadeout
# without releasing the sustain loop (Schism effects.c:1505-1509). Distinct from
# key-off (0x0001), which lifts sustain. Engine handles it via voice.noteFading.
return NOTE_NOTEFADE
if it_note == IT_NOTE_CUT:
return NOTE_CUT
if 0 <= it_note <= 119: