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taud: 'halt at x' cmd

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minjaesong
2026-06-14 23:12:41 +09:00
parent 9eb8b9b3f8
commit fb0765a041
7 changed files with 164 additions and 72 deletions
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44
tsvm_core/src/net/torvald/tsvm/peripheral/AudioAdapter.kt
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@@ -2812,7 +2812,7 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
val length = (rawRow.effectArg ushr 8) and 0xFF
val repeats = rawRow.effectArg and 0xFF
if (length > 0 && repeats > 0 && length <= n) {
val patLen = (cue.instruction as? PlayInstPatLen)?.rows ?: 64
val patLen = cueRowLimit(cue.instruction)
voice.dittoSourceStart = n - length
voice.dittoLength = length
voice.dittoEndRow = minOf(n + length * repeats - 1, patLen - 1)
@@ -3823,9 +3823,16 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
else -> vol
}.coerceIn(0, 0x3F)
/** Effective playable row count for a cue: LEN and "halt at x" both shorten it. */
private fun cueRowLimit(instr: PlayInstruction): Int = when (instr) {
is PlayInstPatLen -> instr.rows
is PlayInstHaltAt -> instr.rows
else -> 64
}
private fun advanceTrackerCue(ts: TrackerState, playhead: Playhead) {
val instr = cueSheet[ts.cuePos].instruction
if (instr is PlayInstHalt) { playhead.isPlaying = false; return }
if (instr is PlayInstHalt || instr is PlayInstHaltAt) { playhead.isPlaying = false; return }
ts.cuePos = when (instr) {
is PlayInstGoBack -> (ts.cuePos - instr.arg).coerceAtLeast(0)
is PlayInstSkip -> (ts.cuePos + instr.arg).coerceAtMost(1023)
@@ -4056,12 +4063,11 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
}
else -> {
ts.rowIndex++
// LEN cue instruction shortens the effective row count so the
// engine wraps to the next cue early. Patterns fed by the
// converter are still 64 rows long; rows past `rowLimit` are
// silent padding that we skip here.
val currentInst = cueSheet[ts.cuePos].instruction
val rowLimit = if (currentInst is PlayInstPatLen) currentInst.rows else 64
// LEN / "halt at x" cue instructions shorten the effective row
// count so the engine wraps to the next cue (or halts) early.
// Patterns fed by the converter are still 64 rows long; rows past
// `rowLimit` are silent padding that we skip here.
val rowLimit = cueRowLimit(cueSheet[ts.cuePos].instruction)
if (ts.rowIndex >= rowLimit) {
ts.rowIndex = 0
advanceTrackerCue(ts, playhead)
@@ -4085,18 +4091,24 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
// byte 30: instruction (low byte)
// byte 31: instruction arg byte (used by 2-byte forms: LEN, BAK, FWD, JMP)
// Decoding rules per terranmon.txt §"Cue Sheet":
// 00000010 00xxxxxx (LEN) pattern length: rows = (xxxxxx) + 1, range 1..64
// 00000001 (HALT) end of song
// 00000000 (NOP) default 64-row cue
// 1000xxxx yyyyyyyy (BAK) go back 12-bit arg
// 1001xxxx yyyyyyyy (FWD) skip forward 12-bit arg
// 1111xxxx yyyyyyyy (JMP) go to absolute pattern (currently unused)
// 00000010 00xxxxxx (LEN) pattern length: rows = (xxxxxx) + 1, range 1..64
// 00000001 00000000 (HALT) play the full pattern then stop
// 00000001 01xxxxxx (HALT x) play x rows then stop (x = 0 ⇒ full length)
// 00000000 (NOP) default 64-row cue
// 1000xxxx yyyyyyyy (BAK) go back 12-bit arg
// 1001xxxx yyyyyyyy (FWD) skip forward 12-bit arg
// 1111xxxx yyyyyyyy (JMP) go to absolute pattern (currently unused)
private fun recomputeInstruction() {
val b30 = instByte30
val b31 = instByte31
instruction = when {
b30 == 0x02 -> PlayInstPatLen((b31 and 0x3F) + 1)
b30 == 0x01 -> PlayInstHalt
// HALT family: arg byte 01xxxxxx ⇒ "halt at x" (play x rows; x = 0 ⇒
// full length, identical to a plain HALT). Any other arg ⇒ plain HALT.
b30 == 0x01 -> if ((b31 and 0xC0) == 0x40) {
val x = b31 and 0x3F
PlayInstHaltAt(if (x == 0) 64 else x)
} else PlayInstHalt
b30 == 0x00 -> PlayInstNop
// BAK: 1000xxxx yyyyyyyy — 12-bit arg combining b30 low nybble + b31.
(b30 and 0xF0) == 0x80 -> PlayInstGoBack(((b30 and 0xF) shl 8) or (b31 and 0xFF))
@@ -4149,6 +4161,8 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
internal class PlayInstGoBack(arg: Int) : PlayInstruction(arg)
internal class PlayInstSkip(arg: Int) : PlayInstruction(arg)
internal class PlayInstPatLen(val rows: Int) : PlayInstruction(rows)
/** "Halt at x": play [rows] rows of the pattern (1..64) then stop. */
internal class PlayInstHaltAt(val rows: Int) : PlayInstruction(rows)
internal object PlayInstHalt : PlayInstruction(0)
internal object PlayInstNop : PlayInstruction(0)