mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-08-20 07:29:36 +00:00
382 lines
10 KiB
TypeScript
382 lines
10 KiB
TypeScript
"use strict";
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// from TSS
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declare var MasterChannel, AudioLooper, PsgDeviceChannel;
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export var MasterAudio = function() {
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this.master = new MasterChannel();
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this.looper = new AudioLooper(512);
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this.start = function() {
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this.looper.setChannel(this.master);
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this.looper.activate();
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}
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this.stop = function() {
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this.looper.setChannel(null);
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}
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}
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export var AY38910_Audio = function(master) {
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this.psg = new PsgDeviceChannel();
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this.psg.setMode(PsgDeviceChannel.MODE_SIGNED);
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this.psg.setDevice(PsgDeviceChannel.DEVICE_AY_3_8910);
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master.master.addChannel(this.psg);
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var curreg = 0;
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this.reset = function() {
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for (var i=15; i>=0; i--) {
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this.selectRegister(i);
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this.setData(0);
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}
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}
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this.selectRegister = function(val) {
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curreg = val & 0xf;
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}
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this.setData = function(val) {
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this.psg.writeRegisterAY(curreg, val & 0xff);
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}
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}
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// https://en.wikipedia.org/wiki/POKEY
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// https://user.xmission.com/~trevin/atari/pokey_regs.html
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// http://krap.pl/mirrorz/atari/homepage.ntlworld.com/kryten_droid/Atari/800XL/atari_hw/pokey.htm
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export var POKEYDeviceChannel = function() {
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/* definitions for AUDCx (D201, D203, D205, D207) */
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var NOTPOLY5 = 0x80 /* selects POLY5 or direct CLOCK */
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var POLY4 = 0x40 /* selects POLY4 or POLY17 */
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var PURE = 0x20 /* selects POLY4/17 or PURE tone */
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var VOL_ONLY = 0x10 /* selects VOLUME OUTPUT ONLY */
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var VOLUME_MASK = 0x0f /* volume mask */
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/* definitions for AUDCTL (D208) */
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var POLY9 = 0x80 /* selects POLY9 or POLY17 */
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var CH1_179 = 0x40 /* selects 1.78979 MHz for Ch 1 */
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var CH3_179 = 0x20 /* selects 1.78979 MHz for Ch 3 */
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var CH1_CH2 = 0x10 /* clocks channel 1 w/channel 2 */
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var CH3_CH4 = 0x08 /* clocks channel 3 w/channel 4 */
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var CH1_FILTER = 0x04 /* selects channel 1 high pass filter */
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var CH2_FILTER = 0x02 /* selects channel 2 high pass filter */
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var CLOCK_15 = 0x01 /* selects 15.6999kHz or 63.9210kHz */
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/* for accuracy, the 64kHz and 15kHz clocks are exact divisions of
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the 1.79MHz clock */
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var DIV_64 = 28 /* divisor for 1.79MHz clock to 64 kHz */
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var DIV_15 = 114 /* divisor for 1.79MHz clock to 15 kHz */
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/* the size (in entries) of the 4 polynomial tables */
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var POLY4_SIZE = 0x000f
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var POLY5_SIZE = 0x001f
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var POLY9_SIZE = 0x01ff
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var POLY17_SIZE = 0x0001ffff /* else use the full 17 bits */
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/* channel/chip definitions */
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var CHAN1 = 0
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var CHAN2 = 1
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var CHAN3 = 2
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var CHAN4 = 3
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var CHIP1 = 0
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var CHIP2 = 4
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var CHIP3 = 8
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var CHIP4 = 12
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var SAMPLE = 127
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var FREQ_17_EXACT = 1789790.0 /* exact 1.79 MHz clock freq */
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var FREQ_17_APPROX = 1787520.0 /* approximate 1.79 MHz clock freq */
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// LFSR sequences
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var bit1 = new Uint8Array( [ 0,1 ] );
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var bit4 = new Uint8Array( [ 1,1,0,1,1,1,0,0,0,0,1,0,1,0,0 ] );
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var bit5 = new Uint8Array( [ 0,0,1,1,0,0,0,1,1,1,1,0,0,1,0,1,0,1,1,0,1,1,1,0,1,0,0,0,0,0,1 ] );
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var bit17 = new Uint8Array(1<<17);
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var bit17_5 = new Uint8Array(1<<17);
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var bit5_4 = new Uint8Array(1<<17);
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for (var i=0; i<bit17.length; i++) {
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bit17[i] = Math.random() > 0.5 ? 1 : 0;
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bit17_5[i] = bit17[i] & bit5[i % bit5.length];
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bit5_4[i] = bit5[i % bit5.length] & bit4[i % bit4.length];
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}
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var wavetones = [
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bit17_5, bit5, bit5_4, bit5,
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bit17, bit1, bit4, bit1
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];
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// registers
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var regs = new Uint8Array(16);
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var counters = new Float32Array(4);
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var deltas = new Float32Array(4);
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var volume = new Float32Array(4);
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var audc = new Uint8Array(4);
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var waveforms = [bit1, bit1, bit1, bit1];
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var buffer;
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var sampleRate;
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var clock, baseDelta;
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var dirty = true;
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//
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this.setBufferLength = function (length) {
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buffer = new Int32Array(length);
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};
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this.getBuffer = function () {
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return buffer;
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};
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this.setSampleRate = function (rate) {
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sampleRate = rate;
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baseDelta = FREQ_17_EXACT / rate / 1.2; // TODO?
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};
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function updateValues(addr) {
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var ctrl = regs[8];
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var base = (ctrl & CLOCK_15) ? DIV_15 : DIV_64;
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var div;
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var i = addr & 4;
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var j = i>>1;
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var k = i>>2;
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if (ctrl & (CH1_CH2>>k)) {
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if (ctrl & (CH1_179>>k))
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div = regs[i+2] * 256 + regs[i+0] + 7;
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else
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div = (regs[i+2] * 256 + regs[i+0] + 1) * base;
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deltas[j+1] = baseDelta / div;
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deltas[j+0] = 0;
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} else {
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if (ctrl & (CH1_179>>k)) {
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div = regs[i+0] + 4;
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} else {
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div = (regs[i+0] + 1) * base;
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}
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deltas[j+0] = baseDelta / div;
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div = (regs[i+2] + 1) * base;
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deltas[j+1] = baseDelta / div;
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}
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//console.log(addr, ctrl.toString(16), div, deltas[j+0], deltas[j+1]);
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}
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this.setRegister = function(addr, value) {
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addr &= 0xf;
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value &= 0xff;
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if (regs[addr] != value) {
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regs[addr] = value;
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switch (addr) {
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case 0:
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case 2:
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case 4:
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case 6: // AUDF
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case 8: // ctrl
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dirty = true;
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break;
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case 1:
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case 3:
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case 5:
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case 7: // AUDC
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volume[addr>>1] = value & 0xf;
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waveforms[addr>>1] = wavetones[value>>5];
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break;
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}
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}
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}
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this.generate = function (length) {
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if (dirty) {
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updateValues(0);
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updateValues(4);
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dirty = false;
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}
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for (var s=0; s<length; s+=2) {
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var sample = 0;
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for (var i=0; i<4; i++) {
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var d = deltas[i];
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var v = volume[i];
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if (d > 0 && d < 1 && v > 0) {
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var wav = waveforms[i];
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var cnt = counters[i] += d;
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if (cnt > wav.length) {
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cnt = counters[i] = cnt - Math.floor(cnt / wav.length) * wav.length;
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}
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var on = wav[Math.floor(cnt)];
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if (on) {
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sample += v;
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}
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}
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}
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sample *= 128;
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buffer[s] = sample;
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buffer[s+1] = sample;
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}
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}
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}
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////// Worker sound
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export var WorkerSoundChannel = function(worker) {
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var sampleRate;
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var output;
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var pending = [];
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var pendingLength = 0;
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worker.onmessage = function(e) {
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if (e && e.data && e.data.samples && output) {
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pending.push(e.data.samples);
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pendingLength += e.data.samples.length;
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}
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};
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this.setBufferLength = function (length) {
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output = new Int16Array(length);
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//worker.postMessage({bufferLength:length,numChannels:2});
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pendingLength = 0;
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};
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this.getBuffer = function () {
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return output;
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};
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this.setSampleRate = function (rate) {
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sampleRate = rate;
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worker.postMessage({sampleRate:rate});
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};
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this.generate = function (length) {
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if (pendingLength < length*3) {
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//console.log(length, pendingLength);
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output.fill(0);
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return; // TODO: send sync msg?
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}
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for (var i=0; i<output.length;) {
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if (pending.length == 0) break; // TODO?
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var buf = pending.shift();
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pendingLength -= buf.length;
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var l = output.length-i;
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if (buf.length < l) {
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output.set(buf, i);
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} else {
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output.set(buf.slice(0, l), i);
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pending.unshift(buf.slice(l));
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pendingLength += buf.length-l;
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}
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i += buf.length;
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}
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}
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}
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// SampleAudio
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export var SampleAudio = function(clockfreq) {
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var self = this;
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var sfrac, sinc, accum;
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var buffer, bufpos, bufferlist;
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var idrain, ifill;
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var nbuffers = 4;
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function mix(ape) {
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var buflen=ape.outputBuffer.length;
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var lbuf = ape.outputBuffer.getChannelData(0);
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var m = this.module;
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if (!m) m = ape.srcElement.module;
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if (!m) return;
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if (m.callback) {
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m.callback(lbuf);
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return;
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} else {
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var buf = bufferlist[idrain];
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for (var i=0; i<lbuf.length; i++) {
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lbuf[i] = buf[i];
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//lbuf[i] = (i&128) ? 1.0 : 0.33;
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}
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idrain = (idrain + 1) % bufferlist.length;
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}
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}
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function createContext() {
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var AudioContext = window['AudioContext'] || window['webkitAudioContext'] || window['mozAudioContext'];
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if (! AudioContext) {
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console.log("no web audio context");
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return;
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}
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self.context = new AudioContext();
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self.sr=self.context.sampleRate;
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self.bufferlen=2048;
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// Amiga 500 fixed filter at 6kHz. WebAudio lowpass is 12dB/oct, whereas
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// older Amigas had a 6dB/oct filter at 4900Hz.
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self.filterNode=self.context.createBiquadFilter();
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self.filterNode.frequency.value=6000;
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// mixer
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if ( typeof self.context.createScriptProcessor === 'function') {
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self.mixerNode=self.context.createScriptProcessor(self.bufferlen, 1, 1);
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} else {
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self.mixerNode=self.context.createJavaScriptNode(self.bufferlen, 1, 1);
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}
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self.mixerNode.module=self;
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self.mixerNode.onaudioprocess=mix;
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// compressor for a bit of volume boost, helps with multich tunes
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self.compressorNode=self.context.createDynamicsCompressor();
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// patch up some cables :)
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self.mixerNode.connect(self.filterNode);
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self.filterNode.connect(self.compressorNode);
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self.compressorNode.connect(self.context.destination);
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}
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this.start = function() {
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if (!this.context) createContext();
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sinc = this.sr * 1.0 / clockfreq;
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sfrac = 0;
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accum = 0;
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bufpos = 0;
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bufferlist = [];
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idrain = 1;
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ifill = 0;
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for (var i=0; i<nbuffers; i++) {
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var arrbuf = new ArrayBuffer(self.bufferlen*4);
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bufferlist[i] = new Float32Array(arrbuf);
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}
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buffer = bufferlist[0];
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}
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this.stop = function() {
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if (this.context) {
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this.context.close();
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this.context = null;
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}
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}
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this.addSingleSample = function(value) {
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if (!buffer) return;
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buffer[bufpos++] = value;
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if (bufpos >= buffer.length) {
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bufpos = 0;
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bufferlist[ifill] = buffer;
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var inext = (ifill + 1) % bufferlist.length;
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if (inext == idrain) {
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ifill = Math.floor(idrain + nbuffers/2) % bufferlist.length;
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//console.log('audio skipped', idrain, ifill);
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} else {
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ifill = inext;
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}
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buffer = bufferlist[ifill];
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}
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}
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this.feedSample = function(value, count) {
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while (count-- > 0) {
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accum += value;
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sfrac += sinc;
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while (sfrac >= 1) {
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sfrac -= 1;
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value *= sfrac;
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this.addSingleSample(accum - value);
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accum = value;
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}
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}
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}
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}
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