arpeggio!*&@
This commit is contained in:
Andy Sloane
parent
6837fbb42e
commit
fca447528e
2 changed files with 61 additions and 30 deletions
10
index.html
10
index.html
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@ -5,9 +5,13 @@
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<body>
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<pre>
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todo:
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- load instruments
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- load samples
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- open audio and start generating
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- pan envelopes
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- effects!
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- arpeggio
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- vibrato
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- portamento / pitch slide
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- volume slide (via Axy effect + volume effects)
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- instrument vibrato
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</pre>
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<pre id='debug'>
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</pre>
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81
xm.js
81
xm.js
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@ -12,17 +12,21 @@ function prettify_number(num) {
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return num;
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}
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function prettify_volume(num) {
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if (num < 0x10) return "--";
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return num.toString(16);
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}
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function prettify_effect(t, p) {
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if (t == -1) t = "-"; else t = t.toString(16);
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if (p == -1) p = "--";
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else if (p < 16) p = '0' + p.toString(16);
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t = t.toString(16);
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if (p < 16) p = '0' + p.toString(16);
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else p = p.toString(16);
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return "" + t + p
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return t + p
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}
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function prettify_notedata(note, inst, vol, efftype, effparam) {
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return (prettify_note(note) + " " + prettify_number(inst) + " "
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+ prettify_number(vol) + " "
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+ prettify_volume(vol) + " "
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+ prettify_effect(efftype, effparam));
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}
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@ -78,8 +82,15 @@ function Filter(x, coef, state) {
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return y;
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}
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function UpdateChannelNote(ch, note, f_smp) {
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var freq = 8363 * Math.pow(2, note/12.0 + ch.inst.fine/(12*128.0) - 4);
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ch.doff = freq / f_smp;
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ch.filter = FilterCoeffs(ch.doff / 2);
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}
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var cur_songpos = -1, cur_pat = -1, cur_row = 64, cur_ticksamp = 0;
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var cur_tick = 6;
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var patdisplay = [];
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function next_row(f_smp) {
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if (cur_row >= 64) {
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cur_row = 0;
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@ -93,16 +104,17 @@ function next_row(f_smp) {
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cur_row++;
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pretty_row = [];
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for (var i = 0; i < r.length; i++) {
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var ch = channelinfo[i];
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pretty_row.push(prettify_notedata(r[i][0], r[i][1], r[i][2], r[i][3], r[i][4]));
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// instrument trigger
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if (r[i][1] != -1) {
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var inst = instruments[r[i][1] - 1];
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if (inst !== undefined) {
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channelinfo[i].inst = inst;
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ch.inst = inst;
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// retrigger?
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channelinfo[i].off = 0;
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channelinfo[i].release = 0;
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channelinfo[i].envtick = 0;
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ch.off = 0;
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ch.release = 0;
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ch.envtick = 0;
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// new instrument doesn ot reset volume!
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} else {
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// console.log("invalid inst", r[i][1], instruments.length);
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@ -112,11 +124,11 @@ function next_row(f_smp) {
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if (r[i][0] != -1) {
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if (r[i][0] == 96) {
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// release note, FIXME once envelopes are implemented
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channelinfo[i].release = 1;
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ch.release = 1;
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} else {
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// assume linear frequency table (flags header & 1 == 1)
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// is this true in kamel.xm?
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var inst = channelinfo[i].inst;
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var inst = ch.inst;
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if (inst === undefined) {
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continue;
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}
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@ -124,36 +136,45 @@ function next_row(f_smp) {
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// var period = 7680 - r[i][0]*64 - inst.fine*0.5;
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// var freq = 8363 * Math.pow(2, (4608 - period) / 768);
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var note = r[i][0] + inst.note;
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var freq = 8363 * Math.pow(2, note/12.0 + inst.fine/(12*128.0) - 4);
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channelinfo[i].doff = freq / f_smp;
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channelinfo[i].off = 0;
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channelinfo[i].release = 0;
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channelinfo[i].envtick = 0;
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channelinfo[i].filter = FilterCoeffs(channelinfo[i].doff / 2);
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// console.log("channel", i, r[i][0], channelinfo[i]);
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ch.note = note;
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ch.off = 0;
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ch.release = 0;
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ch.envtick = 0;
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UpdateChannelNote(ch, note, f_smp);
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// console.log("channel", i, r[i][0], ch);
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// if there's an instrument and a note, set the volume
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if (r[i][0] != -1) {
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channelinfo[i].volL = inst.vol;
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channelinfo[i].volR = inst.vol;
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var p = (inst.pan - 128) / 128.0;
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ch.volL = Math.sqrt(1 - p) * inst.vol;
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ch.volR = Math.sqrt(1 + p) * inst.vol;
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}
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}
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}
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if (r[i][2] != -1) {
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if (r[i][2] != -1) { // volume column
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// FIXME: panning
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var v = r[i][2];
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if (v < 0x10) {
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console.log("channel", i, "invalid volume", v.toString(16));
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} else if (v <= 0x50) {
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channelinfo[i].volL = v - 0x10;
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channelinfo[i].volR = v - 0x10;
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} else {
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console.log("channel", i, "volume effect", v.toString(16));
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ch.volL = v - 0x10;
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ch.volR = v - 0x10;
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}
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}
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ch.effect = r[i][3];
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ch.effectdata = r[i][4];
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// TODO: process initial effect tick for effects which need it
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}
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console.log(pretty_row.join(" "));
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var debug = document.getElementById("debug");
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debug.innerHTML = 'pat ' + cur_pat + ' row ' + (cur_row-1);
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var pat = document.getElementById("pattern");
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patdisplay.push(pretty_row.join(" "));
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if (patdisplay.length > 16) {
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patdisplay.shift();
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}
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pat.innerHTML = patdisplay.join("\n");
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}
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function next_tick(f_smp) {
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@ -165,6 +186,12 @@ function next_tick(f_smp) {
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for (var j = 0; j < nchan; j++) {
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var ch = channelinfo[j];
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var inst = ch.inst;
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// process effects
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if (ch.effect == 0 && ch.effectdata != 0) {
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var arpeggio = [0, ch.effectdata>>4, ch.effectdata&15];
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var note = ch.note + arpeggio[cur_tick % 3];
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UpdateChannelNote(ch, note, f_smp);
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}
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if (inst === undefined) continue;
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if (inst.env_vol !== undefined) {
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ch.env_vol = GetEnvelope(inst.env_vol, ch.envtick);
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@ -338,7 +365,7 @@ function playXM(arrayBuf) {
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pretty_row = [];
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for (var k = 0; k < nchan; k++) {
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var byte0 = dv.getUint8(idx); idx++;
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var note = -1, inst = -1, vol = -1, efftype = -1, effparam = -1;
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var note = -1, inst = -1, vol = -1, efftype = 0, effparam = 0;
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if (byte0 & 0x80) {
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if (byte0 & 0x01) {
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note = dv.getUint8(idx) - 1; idx++;
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