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Implement all vibrato waveforms

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This commit is contained in:
Johan Hillerström 2015-11-21 02:26:04 +01:00
commit 0e47b13d83
1 changed files with 19 additions and 1 deletions
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20
xmeffects.js
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@ -65,7 +65,7 @@ function eff_t0_4(ch, data) { // vibrato
}
function eff_t1_4(ch) { // vibrato
ch.periodoffset = Math.sin(ch.vibratopos * Math.PI / 32) * ch.vibratodepth;
ch.periodoffset = getVibratoDelta(ch.vibratotype, ch.vibratopos) * ch.vibratodepth;
if (isNaN(ch.periodoffset)) {
console.log("vibrato periodoffset NaN?",
ch.vibratopos, ch.vibratospeed, ch.vibratodepth);
@ -75,6 +75,24 @@ function eff_t1_4(ch) { // vibrato
ch.vibratopos &= 63;
}
function getVibratoDelta(type, x) {
var delta = 0;
switch (type & 0x03) {
case 1: // sawtooth (ramp-down)
delta = ((1 + x * 2 / 64) % 2) - 1;
break;
case 2: // square
case 3: // random (in FT2 these two are the same)
delta = x < 32 ? 1 : -1;
break;
case 0:
default: // sine
delta = Math.sin(x * Math.PI / 32);
break;
}
return delta;
}
function eff_t1_5(ch) { // portamento + volume slide
eff_t1_a(ch);
eff_t1_3(ch);