shithub: ft2-clone

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Simplified relocateTon() (still accurate)

--- a/src/ft2_replayer.c

+++ b/src/ft2_replayer.c

@@ -1628,32 +1628,29 @@

 {

 	int32_t tmpPeriod;

-	const int32_t fineTune = ((ch->fineTune >> 3) + 16) << 1;

-	int32_t hiPeriod = (8 * 12 * 16) * 2;

+	const int32_t fineTune = ((int8_t)ch->fineTune >> 3) + 16;

+	int32_t hiPeriod = 1536; // FT2 bug: should've been 1935

 	int32_t loPeriod = 0;

 	for (int32_t i = 0; i < 8; i++)

 	{

-		tmpPeriod = (((loPeriod + hiPeriod) >> 1) & 0xFFFFFFE0) + fineTune;

+		tmpPeriod = (((loPeriod + hiPeriod) >> 1) & ~15) + fineTune;

-		int32_t tableIndex = (uint32_t)(tmpPeriod - 16) >> 1;

-		tableIndex = CLAMP(tableIndex, 0, 1935); // 8bitbubsy: added security check

+		int32_t lookUp = tmpPeriod - 8;

+		if (lookUp < 0)

+			lookUp = 0; // 8bitbubsy: safety fix (C-0 w/ finetune <= -65)

-		if (period >= note2Period[tableIndex])

-			hiPeriod = (tmpPeriod - fineTune) & 0xFFFFFFE0;

+		if (period >= note2Period[lookUp])

+			hiPeriod = (tmpPeriod - fineTune) & ~15;

 		else

-			loPeriod = (tmpPeriod - fineTune) & 0xFFFFFFE0;

+			loPeriod = (tmpPeriod - fineTune) & ~15;

 	}

-	tmpPeriod = loPeriod + fineTune + (arpNote << 5);

+	tmpPeriod = loPeriod + fineTune + (arpNote << 4);

+	if (tmpPeriod >= 1550) // FT2 bugs: off-by-one edge case, and should've been 1935 (1936)

+		tmpPeriod = 1551;

-	if (tmpPeriod < 0) // 8bitbubsy: added security check

-		tmpPeriod = 0;

-

-	if (tmpPeriod >= (8*12*16+15)*2-1) // FT2 bug: off-by-one edge case

-		tmpPeriod = (8*12*16+15)*2;

-

-	return note2Period[(uint32_t)tmpPeriod>>1];

+	return note2Period[tmpPeriod];

 }

 static void vibrato2(stmTyp *ch)