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arpeggio!*&@

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This commit is contained in:
Andy Sloane 2015-10-24 09:00:24 -07:00
commit fca447528e
2 changed files with 61 additions and 30 deletions
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10
index.html
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@ -5,9 +5,13 @@
<body> <body>
<pre> <pre>
todo: todo:
- load instruments - pan envelopes
- load samples - effects!
- open audio and start generating - arpeggio
- vibrato
- portamento / pitch slide
- volume slide (via Axy effect + volume effects)
- instrument vibrato
</pre> </pre>
<pre id='debug'> <pre id='debug'>
</pre> </pre>

81
xm.js
View file

@ -12,17 +12,21 @@ function prettify_number(num) {
return num; return num;
} }
function prettify_volume(num) {
if (num < 0x10) return "--";
return num.toString(16);
}
function prettify_effect(t, p) { function prettify_effect(t, p) {
if (t == -1) t = "-"; else t = t.toString(16); t = t.toString(16);
if (p == -1) p = "--"; if (p < 16) p = '0' + p.toString(16);
else if (p < 16) p = '0' + p.toString(16);
else p = p.toString(16); else p = p.toString(16);
return "" + t + p return t + p
} }
function prettify_notedata(note, inst, vol, efftype, effparam) { function prettify_notedata(note, inst, vol, efftype, effparam) {
return (prettify_note(note) + " " + prettify_number(inst) + " " return (prettify_note(note) + " " + prettify_number(inst) + " "
+ prettify_number(vol) + " " + prettify_volume(vol) + " "
+ prettify_effect(efftype, effparam)); + prettify_effect(efftype, effparam));
} }
@ -78,8 +82,15 @@ function Filter(x, coef, state) {
return y; return y;
} }
function UpdateChannelNote(ch, note, f_smp) {
var freq = 8363 * Math.pow(2, note/12.0 + ch.inst.fine/(12*128.0) - 4);
ch.doff = freq / f_smp;
ch.filter = FilterCoeffs(ch.doff / 2);
}
var cur_songpos = -1, cur_pat = -1, cur_row = 64, cur_ticksamp = 0; var cur_songpos = -1, cur_pat = -1, cur_row = 64, cur_ticksamp = 0;
var cur_tick = 6; var cur_tick = 6;
var patdisplay = [];
function next_row(f_smp) { function next_row(f_smp) {
if (cur_row >= 64) { if (cur_row >= 64) {
cur_row = 0; cur_row = 0;
@ -93,16 +104,17 @@ function next_row(f_smp) {
cur_row++; cur_row++;
pretty_row = []; pretty_row = [];
for (var i = 0; i < r.length; i++) { for (var i = 0; i < r.length; i++) {
var ch = channelinfo[i];
pretty_row.push(prettify_notedata(r[i][0], r[i][1], r[i][2], r[i][3], r[i][4])); pretty_row.push(prettify_notedata(r[i][0], r[i][1], r[i][2], r[i][3], r[i][4]));
// instrument trigger // instrument trigger
if (r[i][1] != -1) { if (r[i][1] != -1) {
var inst = instruments[r[i][1] - 1]; var inst = instruments[r[i][1] - 1];
if (inst !== undefined) { if (inst !== undefined) {
channelinfo[i].inst = inst; ch.inst = inst;
// retrigger? // retrigger?
channelinfo[i].off = 0; ch.off = 0;
channelinfo[i].release = 0; ch.release = 0;
channelinfo[i].envtick = 0; ch.envtick = 0;
// new instrument doesn ot reset volume! // new instrument doesn ot reset volume!
} else { } else {
// console.log("invalid inst", r[i][1], instruments.length); // console.log("invalid inst", r[i][1], instruments.length);
@ -112,11 +124,11 @@ function next_row(f_smp) {
if (r[i][0] != -1) { if (r[i][0] != -1) {
if (r[i][0] == 96) { if (r[i][0] == 96) {
// release note, FIXME once envelopes are implemented // release note, FIXME once envelopes are implemented
channelinfo[i].release = 1; ch.release = 1;
} else { } else {
// assume linear frequency table (flags header & 1 == 1) // assume linear frequency table (flags header & 1 == 1)
// is this true in kamel.xm? // is this true in kamel.xm?
var inst = channelinfo[i].inst; var inst = ch.inst;
if (inst === undefined) { if (inst === undefined) {
continue; continue;
} }
@ -124,36 +136,45 @@ function next_row(f_smp) {
// var period = 7680 - r[i][0]*64 - inst.fine*0.5; // var period = 7680 - r[i][0]*64 - inst.fine*0.5;
// var freq = 8363 * Math.pow(2, (4608 - period) / 768); // var freq = 8363 * Math.pow(2, (4608 - period) / 768);
var note = r[i][0] + inst.note; var note = r[i][0] + inst.note;
var freq = 8363 * Math.pow(2, note/12.0 + inst.fine/(12*128.0) - 4); ch.note = note;
channelinfo[i].doff = freq / f_smp; ch.off = 0;
channelinfo[i].off = 0; ch.release = 0;
channelinfo[i].release = 0; ch.envtick = 0;
channelinfo[i].envtick = 0; UpdateChannelNote(ch, note, f_smp);
channelinfo[i].filter = FilterCoeffs(channelinfo[i].doff / 2); // console.log("channel", i, r[i][0], ch);
// console.log("channel", i, r[i][0], channelinfo[i]);
// if there's an instrument and a note, set the volume // if there's an instrument and a note, set the volume
if (r[i][0] != -1) { if (r[i][0] != -1) {
channelinfo[i].volL = inst.vol; var p = (inst.pan - 128) / 128.0;
channelinfo[i].volR = inst.vol; ch.volL = Math.sqrt(1 - p) * inst.vol;
ch.volR = Math.sqrt(1 + p) * inst.vol;
} }
} }
} }
if (r[i][2] != -1) { if (r[i][2] != -1) { // volume column
// FIXME: panning // FIXME: panning
var v = r[i][2]; var v = r[i][2];
if (v < 0x10) { if (v < 0x10) {
console.log("channel", i, "invalid volume", v.toString(16)); console.log("channel", i, "invalid volume", v.toString(16));
} else if (v <= 0x50) { } else if (v <= 0x50) {
channelinfo[i].volL = v - 0x10; ch.volL = v - 0x10;
channelinfo[i].volR = v - 0x10; ch.volR = v - 0x10;
} else {
console.log("channel", i, "volume effect", v.toString(16));
} }
} }
ch.effect = r[i][3];
ch.effectdata = r[i][4];
// TODO: process initial effect tick for effects which need it
} }
console.log(pretty_row.join(" "));
var debug = document.getElementById("debug"); var debug = document.getElementById("debug");
debug.innerHTML = 'pat ' + cur_pat + ' row ' + (cur_row-1); debug.innerHTML = 'pat ' + cur_pat + ' row ' + (cur_row-1);
var pat = document.getElementById("pattern");
patdisplay.push(pretty_row.join(" "));
if (patdisplay.length > 16) {
patdisplay.shift();
}
pat.innerHTML = patdisplay.join("\n");
} }
function next_tick(f_smp) { function next_tick(f_smp) {
@ -165,6 +186,12 @@ function next_tick(f_smp) {
for (var j = 0; j < nchan; j++) { for (var j = 0; j < nchan; j++) {
var ch = channelinfo[j]; var ch = channelinfo[j];
var inst = ch.inst; var inst = ch.inst;
// process effects
if (ch.effect == 0 && ch.effectdata != 0) {
var arpeggio = [0, ch.effectdata>>4, ch.effectdata&15];
var note = ch.note + arpeggio[cur_tick % 3];
UpdateChannelNote(ch, note, f_smp);
}
if (inst === undefined) continue; if (inst === undefined) continue;
if (inst.env_vol !== undefined) { if (inst.env_vol !== undefined) {
ch.env_vol = GetEnvelope(inst.env_vol, ch.envtick); ch.env_vol = GetEnvelope(inst.env_vol, ch.envtick);
@ -338,7 +365,7 @@ function playXM(arrayBuf) {
pretty_row = []; pretty_row = [];
for (var k = 0; k < nchan; k++) { for (var k = 0; k < nchan; k++) {
var byte0 = dv.getUint8(idx); idx++; var byte0 = dv.getUint8(idx); idx++;
var note = -1, inst = -1, vol = -1, efftype = -1, effparam = -1; var note = -1, inst = -1, vol = -1, efftype = 0, effparam = 0;
if (byte0 & 0x80) { if (byte0 & 0x80) {
if (byte0 & 0x01) { if (byte0 & 0x01) {
note = dv.getUint8(idx) - 1; idx++; note = dv.getUint8(idx) - 1; idx++;