mirror of
https://github.com/sehugg/8bitworkshop.git
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POKEY sound
This commit is contained in:
Steven Hugg
parent
042041e041
commit
fe9b295539
210
src/emu.js
210
src/emu.js
@ -127,6 +127,9 @@ var VectorVideo = function(mainElement, width, height) {
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var canvas, ctx;
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var persistenceAlpha = 0.5;
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var jitter = 1.0;
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var gamma = 0.8;
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var sx = width/1024.0;
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var sy = height/1024.0;
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this.create = function() {
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canvas = __createCanvas(mainElement, width, height);
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@ -155,13 +158,13 @@ var VectorVideo = function(mainElement, width, height) {
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}
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var COLORS = [
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'#000000',
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'#0000ff',
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'#00ff00',
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'#00ffff',
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'#ff0000',
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'#ff00ff',
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'#ffff00',
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'#111111',
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'#1111ff',
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'#11ff11',
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'#11ffff',
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'#ff1111',
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'#ff11ff',
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'#ffff11',
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'#ffffff'
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];
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@ -169,7 +172,8 @@ var VectorVideo = function(mainElement, width, height) {
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//console.log(x1, y1, x2, y2, intensity);
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if (intensity > 0) {
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// TODO: landscape vs portrait
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ctx.globalAlpha = intensity / 255.0;
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var alpha = Math.pow(intensity / 255.0, gamma);
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ctx.globalAlpha = alpha;
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ctx.beginPath();
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// TODO: bright dots
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var jx = jitter * (Math.random() - 0.5);
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@ -178,8 +182,11 @@ var VectorVideo = function(mainElement, width, height) {
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x2 += jx;
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y1 += jy;
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y2 += jy;
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ctx.moveTo(x1, height-y1);
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ctx.lineTo(x2+1, height-y2);
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ctx.moveTo(x1*sx, height-y1*sy);
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if (x1 == x2 && y1 == y2)
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ctx.lineTo(x2*sx+1, height-y2*sy);
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else
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ctx.lineTo(x2*sx, height-y2*sy);
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ctx.strokeStyle = COLORS[color & 7];
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ctx.stroke();
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}
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@ -248,13 +255,12 @@ var SampleAudio = function(clockfreq) {
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}
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function createContext() {
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if ( typeof AudioContext !== 'undefined') {
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self.context = new AudioContext();
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} else if (typeof webkitAudioContext !== 'undefined' ){
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self.context = new webkitAudioContext();
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} else {
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var AudioContext = AudioContext || webkitAudioContext || 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=(self.sr > 44100) ? 4096 : 2048;
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@ -381,6 +387,180 @@ var AY38910_Audio = function(master) {
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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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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 = [ 0,1 ];
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var bit4 = [ 1,1,0,1,1,1,0,0,0,0,1,0,1,0,0 ];
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var bit5 = [ 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;
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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 = 44100;
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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 > POLY17_SIZE+1) {
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counters[i] -= POLY17_SIZE+1;
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}
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var on = wav[Math.floor(cnt % wav.length)];
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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 *= 273;
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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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////// 6502
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var Base6502Platform = function() {
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@ -31,6 +31,17 @@ var GRAVITAR_KEYCODE_MAP = makeKeycodeMap([
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[Keys.VK_LEFT, 1, -0x8],
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]);
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function newPOKEYAudio() {
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var pokey1 = new POKEYDeviceChannel();
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var pokey2 = new POKEYDeviceChannel();
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var audio = new MasterAudio();
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audio.pokey1 = pokey1;
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audio.pokey2 = pokey2;
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audio.master.addChannel(pokey1);
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audio.master.addChannel(pokey2);
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return audio;
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}
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var AtariVectorPlatform = function(mainElement) {
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var self = this;
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var cpuFrequency = 1500000.0;
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@ -78,7 +89,7 @@ var AtariVectorPlatform = function(mainElement) {
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// create video/audio
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video = new VectorVideo(mainElement,1024,1024);
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dvg = new DVGBWStateMachine(bus, video, 0x4000);
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audio = new SampleAudio(cpuFrequency);
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audio = newPOKEYAudio();
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video.create();
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timer = new AnimationTimer(60, function() {
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video.clear();
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@ -120,9 +131,11 @@ var AtariVectorPlatform = function(mainElement) {
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}
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this.pause = function() {
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timer.stop();
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audio.stop();
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}
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this.resume = function() {
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timer.start();
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audio.start();
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}
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this.reset = function() {
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this.clearDebug();
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@ -202,8 +215,8 @@ var AtariColorVectorPlatform = function(mainElement) {
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write: new AddressDecoder([
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[0x0, 0x7ff, 0x7ff, function(a,v) { cpuram.mem[a] = v; }],
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[0x2000, 0x27ff, 0x7ff, function(a,v) { dvgram.mem[a] = v; }],
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[0x6000, 0x67ff, 0x7ff, function(a,v) { /* pokey1 */ }],
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[0x6800, 0x6fff, 0x7ff, function(a,v) { /* pokey2 */ }],
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[0x6000, 0x67ff, 0xf, function(a,v) { audio.pokey1.setRegister(a, v); }],
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[0x6800, 0x6fff, 0xf, function(a,v) { audio.pokey2.setRegister(a, v); }],
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[0x8800, 0x8800, 0, function(a,v) { /* LEDs, etc */ }],
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[0x8840, 0x8840, 0, function(a,v) { dvg.runUntilHalt(0); }],
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[0x8880, 0x8880, 0, function(a,v) { dvg.reset(); }],
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@ -223,7 +236,7 @@ var AtariColorVectorPlatform = function(mainElement) {
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// create video/audio
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video = new VectorVideo(mainElement,1024,1024);
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dvg = new DVGColorStateMachine(bus, video, 0x2000);
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audio = new SampleAudio(cpuFrequency);
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audio = newPOKEYAudio();
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video.create();
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timer = new AnimationTimer(60, function() {
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video.clear();
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@ -260,9 +273,11 @@ var AtariColorVectorPlatform = function(mainElement) {
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}
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this.pause = function() {
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timer.stop();
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audio.stop();
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}
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this.resume = function() {
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timer.start();
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audio.start();
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}
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this.reset = function() {
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this.clearDebug();
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@ -322,6 +337,8 @@ var Z80ColorVectorPlatform = function(mainElement, proto) {
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]),
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write: new AddressDecoder([
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[0x8000, 0x800f, 0xf, function(a,v) { audio.pokey1.setRegister(a, v); }],
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[0x8010, 0x801f, 0xf, function(a,v) { audio.pokey2.setRegister(a, v); }],
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[0x8840, 0x8840, 0, function(a,v) { dvg.runUntilHalt(0); }],
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[0x8880, 0x8880, 0, function(a,v) { dvg.reset(); }],
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[0xa000, 0xdfff, 0x3fff, function(a,v) { dvgram.mem[a] = v; }],
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@ -333,7 +350,7 @@ var Z80ColorVectorPlatform = function(mainElement, proto) {
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// create video/audio
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video = new VectorVideo(mainElement,1024,1024);
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dvg = new DVGColorStateMachine(bus, video, 0xa000);
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audio = new SampleAudio(cpuFrequency);
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audio = newPOKEYAudio();
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video.create();
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timer = new AnimationTimer(60, function() {
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video.clear();
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@ -358,9 +375,11 @@ var Z80ColorVectorPlatform = function(mainElement, proto) {
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}
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this.pause = function() {
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timer.stop();
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audio.stop();
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}
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this.resume = function() {
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timer.start();
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audio.start();
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}
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this.reset = function() {
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cpu.reset();
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