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a few Exy effects

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This commit is contained in:
Andy Sloane 2015-10-28 13:56:57 -07:00
commit 49de30d741
1 changed files with 45 additions and 2 deletions
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47
xm.js
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@ -469,6 +469,39 @@ function eff_t0_c(ch, data) { // set volume
ch.vol = data & 0x3f;
}
function eff_t0_e(ch, data) { // extended effects!
var eff = data >> 4;
data = data & 0x0f;
switch (eff) {
case 1: // fine porta up
ch.period -= data;
break;
case 2: // fine porta down
ch.period += data;
break;
case 8: // panning
ch.pan = data * 0x11;
break;
case 0x0a: // fine vol slide up (with memory)
if (data == 0 && ch.finevolup != undefined)
data = ch.finevolup;
ch.vol = Math.min(64, ch.vol + data);
ch.finevolup = data;
break;
case 0x0b: // fine vol slide down
if (data == 0 && ch.finevoldown != undefined)
data = ch.finevoldown;
ch.vol = Math.max(0, ch.vol - data);
ch.finevoldown = data;
break;
case 0x0c: // note cut handled in eff_t1_e
break;
default:
console.log("unimplemented extended effect E", ch.effect.toString(16));
break;
}
}
function eff_t0_f(ch, data) { // set tempo
if (data == 0) {
console.log("tempo 0?");
@ -499,7 +532,7 @@ var effects_t0 = [ // effect functions on tick 0
eff_unimplemented_t0, // b
eff_t0_c, // c
eff_unimplemented_t0, // d
eff_unimplemented_t0, // e
eff_t0_e, // e
eff_t0_f, // f
];
@ -552,6 +585,16 @@ function eff_t1_a(ch) { // volume slide
}
}
function eff_t1_e(ch) { // note cut
switch (ch.effectdata >> 4) {
case 0x0c:
if (cur_tick == (ch.effectdata & 0x0f)) {
ch.vol = 0;
}
break;
}
}
function eff_unimplemented() {}
var effects_t1 = [ // effect functions on tick 1+
eff_t1_0,
@ -568,7 +611,7 @@ var effects_t1 = [ // effect functions on tick 1+
eff_unimplemented, // b
eff_unimplemented, // c
eff_unimplemented, // d
eff_unimplemented, // e
eff_t1_e, // e
eff_unimplemented, // f
];