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) {
|
|||
var canvas, ctx;
|
||||
var persistenceAlpha = 0.5;
|
||||
var jitter = 1.0;
|
||||
var gamma = 0.8;
|
||||
var sx = width/1024.0;
|
||||
var sy = height/1024.0;
|
||||
|
||||
this.create = function() {
|
||||
canvas = __createCanvas(mainElement, width, height);
|
||||
|
|
@ -155,13 +158,13 @@ var VectorVideo = function(mainElement, width, height) {
|
|||
}
|
||||
|
||||
var COLORS = [
|
||||
'#000000',
|
||||
'#0000ff',
|
||||
'#00ff00',
|
||||
'#00ffff',
|
||||
'#ff0000',
|
||||
'#ff00ff',
|
||||
'#ffff00',
|
||||
'#111111',
|
||||
'#1111ff',
|
||||
'#11ff11',
|
||||
'#11ffff',
|
||||
'#ff1111',
|
||||
'#ff11ff',
|
||||
'#ffff11',
|
||||
'#ffffff'
|
||||
];
|
||||
|
||||
|
|
@ -169,7 +172,8 @@ var VectorVideo = function(mainElement, width, height) {
|
|||
//console.log(x1, y1, x2, y2, intensity);
|
||||
if (intensity > 0) {
|
||||
// TODO: landscape vs portrait
|
||||
ctx.globalAlpha = intensity / 255.0;
|
||||
var alpha = Math.pow(intensity / 255.0, gamma);
|
||||
ctx.globalAlpha = alpha;
|
||||
ctx.beginPath();
|
||||
// TODO: bright dots
|
||||
var jx = jitter * (Math.random() - 0.5);
|
||||
|
|
@ -178,8 +182,11 @@ var VectorVideo = function(mainElement, width, height) {
|
|||
x2 += jx;
|
||||
y1 += jy;
|
||||
y2 += jy;
|
||||
ctx.moveTo(x1, height-y1);
|
||||
ctx.lineTo(x2+1, height-y2);
|
||||
ctx.moveTo(x1*sx, height-y1*sy);
|
||||
if (x1 == x2 && y1 == y2)
|
||||
ctx.lineTo(x2*sx+1, height-y2*sy);
|
||||
else
|
||||
ctx.lineTo(x2*sx, height-y2*sy);
|
||||
ctx.strokeStyle = COLORS[color & 7];
|
||||
ctx.stroke();
|
||||
}
|
||||
|
|
@ -248,13 +255,12 @@ var SampleAudio = function(clockfreq) {
|
|||
}
|
||||
|
||||
function createContext() {
|
||||
if ( typeof AudioContext !== 'undefined') {
|
||||
self.context = new AudioContext();
|
||||
} else if (typeof webkitAudioContext !== 'undefined' ){
|
||||
self.context = new webkitAudioContext();
|
||||
} else {
|
||||
var AudioContext = AudioContext || webkitAudioContext || mozAudioContext;
|
||||
if (! AudioContext) {
|
||||
console.log("no web audio context");
|
||||
return;
|
||||
}
|
||||
self.context = new AudioContext();
|
||||
self.sr=self.context.sampleRate;
|
||||
self.bufferlen=(self.sr > 44100) ? 4096 : 2048;
|
||||
|
||||
|
|
@ -381,6 +387,180 @@ var AY38910_Audio = function(master) {
|
|||
}
|
||||
}
|
||||
|
||||
// https://en.wikipedia.org/wiki/POKEY
|
||||
// https://user.xmission.com/~trevin/atari/pokey_regs.html
|
||||
// http://krap.pl/mirrorz/atari/homepage.ntlworld.com/kryten_droid/Atari/800XL/atari_hw/pokey.htm
|
||||
|
||||
var POKEYDeviceChannel = function() {
|
||||
|
||||
/* definitions for AUDCx (D201, D203, D205, D207) */
|
||||
var NOTPOLY5 = 0x80 /* selects POLY5 or direct CLOCK */
|
||||
var POLY4 = 0x40 /* selects POLY4 or POLY17 */
|
||||
var PURE = 0x20 /* selects POLY4/17 or PURE tone */
|
||||
var VOL_ONLY = 0x10 /* selects VOLUME OUTPUT ONLY */
|
||||
var VOLUME_MASK = 0x0f /* volume mask */
|
||||
|
||||
/* definitions for AUDCTL (D208) */
|
||||
var POLY9 = 0x80 /* selects POLY9 or POLY17 */
|
||||
var CH1_179 = 0x40 /* selects 1.78979 MHz for Ch 1 */
|
||||
var CH3_179 = 0x20 /* selects 1.78979 MHz for Ch 3 */
|
||||
var CH1_CH2 = 0x10 /* clocks channel 1 w/channel 2 */
|
||||
var CH3_CH4 = 0x08 /* clocks channel 3 w/channel 4 */
|
||||
var CH1_FILTER = 0x04 /* selects channel 1 high pass filter */
|
||||
var CH2_FILTER = 0x02 /* selects channel 2 high pass filter */
|
||||
var CLOCK_15 = 0x01 /* selects 15.6999kHz or 63.9210kHz */
|
||||
|
||||
/* for accuracy, the 64kHz and 15kHz clocks are exact divisions of
|
||||
the 1.79MHz clock */
|
||||
var DIV_64 = 28 /* divisor for 1.79MHz clock to 64 kHz */
|
||||
var DIV_15 = 114 /* divisor for 1.79MHz clock to 15 kHz */
|
||||
|
||||
/* the size (in entries) of the 4 polynomial tables */
|
||||
var POLY4_SIZE = 0x000f
|
||||
var POLY5_SIZE = 0x001f
|
||||
var POLY9_SIZE = 0x01ff
|
||||
|
||||
var POLY17_SIZE = 0x0001ffff /* else use the full 17 bits */
|
||||
|
||||
/* channel/chip definitions */
|
||||
var CHAN1 = 0
|
||||
var CHAN2 = 1
|
||||
var CHAN3 = 2
|
||||
var CHAN4 = 3
|
||||
var CHIP1 = 0
|
||||
var CHIP2 = 4
|
||||
var CHIP3 = 8
|
||||
var CHIP4 = 12
|
||||
var SAMPLE = 127
|
||||
|
||||
var FREQ_17_EXACT = 1789790.0 /* exact 1.79 MHz clock freq */
|
||||
var FREQ_17_APPROX = 1787520.0 /* approximate 1.79 MHz clock freq */
|
||||
|
||||
// LFSR sequences
|
||||
var bit1 = [ 0,1 ];
|
||||
var bit4 = [ 1,1,0,1,1,1,0,0,0,0,1,0,1,0,0 ];
|
||||
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 ];
|
||||
var bit17 = new Uint8Array(1<<17);
|
||||
var bit17_5 = new Uint8Array(1<<17);
|
||||
var bit5_4 = new Uint8Array(1<<17);
|
||||
for (var i=0; i<bit17.length; i++) {
|
||||
bit17[i] = Math.random() > 0.5;
|
||||
bit17_5[i] = bit17[i] & bit5[i % bit5.length];
|
||||
bit5_4[i] = bit5[i % bit5.length] & bit4[i % bit4.length];
|
||||
}
|
||||
var wavetones = [
|
||||
bit17_5, bit5, bit5_4, bit5,
|
||||
bit17, bit1, bit4, bit1
|
||||
];
|
||||
|
||||
// registers
|
||||
var regs = new Uint8Array(16);
|
||||
var counters = new Float32Array(4);
|
||||
var deltas = new Float32Array(4);
|
||||
var volume = new Float32Array(4);
|
||||
var audc = new Uint8Array(4);
|
||||
var waveforms = [bit1, bit1, bit1, bit1];
|
||||
var buffer;
|
||||
var sampleRate = 44100;
|
||||
var clock, baseDelta;
|
||||
var dirty = true;
|
||||
|
||||
//
|
||||
|
||||
this.setBufferLength = function (length) {
|
||||
buffer = new Int32Array(length);
|
||||
};
|
||||
|
||||
this.getBuffer = function () {
|
||||
return buffer;
|
||||
};
|
||||
|
||||
this.setSampleRate = function (rate) {
|
||||
sampleRate = rate;
|
||||
baseDelta = FREQ_17_EXACT / rate / 1.2; // TODO?
|
||||
};
|
||||
|
||||
function updateValues(addr) {
|
||||
var ctrl = regs[8];
|
||||
var base = (ctrl & CLOCK_15) ? DIV_15 : DIV_64;
|
||||
var div;
|
||||
var i = addr & 4;
|
||||
var j = i>>1;
|
||||
var k = i>>2;
|
||||
if (ctrl & (CH1_CH2>>k)) {
|
||||
if (ctrl & (CH1_179>>k))
|
||||
div = regs[i+2] * 256 + regs[i+0] + 7;
|
||||
else
|
||||
div = (regs[i+2] * 256 + regs[i+0] + 1) * base;
|
||||
deltas[j+1] = baseDelta / div;
|
||||
deltas[j+0] = 0;
|
||||
} else {
|
||||
if (ctrl & (CH1_179>>k)) {
|
||||
div = regs[i+0] + 4;
|
||||
} else {
|
||||
div = (regs[i+0] + 1) * base;
|
||||
}
|
||||
deltas[j+0] = baseDelta / div;
|
||||
div = (regs[i+2] + 1) * base;
|
||||
deltas[j+1] = baseDelta / div;
|
||||
}
|
||||
//console.log(addr, ctrl.toString(16), div, deltas[j+0], deltas[j+1]);
|
||||
}
|
||||
|
||||
this.setRegister = function(addr, value) {
|
||||
addr &= 0xf;
|
||||
value &= 0xff;
|
||||
if (regs[addr] != value) {
|
||||
regs[addr] = value;
|
||||
switch (addr) {
|
||||
case 0:
|
||||
case 2:
|
||||
case 4:
|
||||
case 6: // AUDF
|
||||
case 8: // ctrl
|
||||
dirty = true;
|
||||
break;
|
||||
case 1:
|
||||
case 3:
|
||||
case 5:
|
||||
case 7: // AUDC
|
||||
volume[addr>>1] = value & 0xf;
|
||||
waveforms[addr>>1] = wavetones[value>>5];
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
this.generate = function (length) {
|
||||
if (dirty) {
|
||||
updateValues(0);
|
||||
updateValues(4);
|
||||
dirty = false;
|
||||
}
|
||||
for (var s=0; s<length; s+=2) {
|
||||
var sample = 0;
|
||||
for (var i=0; i<4; i++) {
|
||||
var d = deltas[i];
|
||||
var v = volume[i];
|
||||
if (d > 0 && d < 1 && v > 0) {
|
||||
var wav = waveforms[i];
|
||||
var cnt = counters[i] += d;
|
||||
if (cnt > POLY17_SIZE+1) {
|
||||
counters[i] -= POLY17_SIZE+1;
|
||||
}
|
||||
var on = wav[Math.floor(cnt % wav.length)];
|
||||
if (on) {
|
||||
sample += v;
|
||||
}
|
||||
}
|
||||
}
|
||||
sample *= 273;
|
||||
buffer[s] = sample;
|
||||
buffer[s+1] = sample;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
////// 6502
|
||||
|
||||
var Base6502Platform = function() {
|
||||
|
|
|
|||
|
|
@ -31,6 +31,17 @@ var GRAVITAR_KEYCODE_MAP = makeKeycodeMap([
|
|||
[Keys.VK_LEFT, 1, -0x8],
|
||||
]);
|
||||
|
||||
function newPOKEYAudio() {
|
||||
var pokey1 = new POKEYDeviceChannel();
|
||||
var pokey2 = new POKEYDeviceChannel();
|
||||
var audio = new MasterAudio();
|
||||
audio.pokey1 = pokey1;
|
||||
audio.pokey2 = pokey2;
|
||||
audio.master.addChannel(pokey1);
|
||||
audio.master.addChannel(pokey2);
|
||||
return audio;
|
||||
}
|
||||
|
||||
var AtariVectorPlatform = function(mainElement) {
|
||||
var self = this;
|
||||
var cpuFrequency = 1500000.0;
|
||||
|
|
@ -78,7 +89,7 @@ var AtariVectorPlatform = function(mainElement) {
|
|||
// create video/audio
|
||||
video = new VectorVideo(mainElement,1024,1024);
|
||||
dvg = new DVGBWStateMachine(bus, video, 0x4000);
|
||||
audio = new SampleAudio(cpuFrequency);
|
||||
audio = newPOKEYAudio();
|
||||
video.create();
|
||||
timer = new AnimationTimer(60, function() {
|
||||
video.clear();
|
||||
|
|
@ -120,9 +131,11 @@ var AtariVectorPlatform = function(mainElement) {
|
|||
}
|
||||
this.pause = function() {
|
||||
timer.stop();
|
||||
audio.stop();
|
||||
}
|
||||
this.resume = function() {
|
||||
timer.start();
|
||||
audio.start();
|
||||
}
|
||||
this.reset = function() {
|
||||
this.clearDebug();
|
||||
|
|
@ -202,8 +215,8 @@ var AtariColorVectorPlatform = function(mainElement) {
|
|||
write: new AddressDecoder([
|
||||
[0x0, 0x7ff, 0x7ff, function(a,v) { cpuram.mem[a] = v; }],
|
||||
[0x2000, 0x27ff, 0x7ff, function(a,v) { dvgram.mem[a] = v; }],
|
||||
[0x6000, 0x67ff, 0x7ff, function(a,v) { /* pokey1 */ }],
|
||||
[0x6800, 0x6fff, 0x7ff, function(a,v) { /* pokey2 */ }],
|
||||
[0x6000, 0x67ff, 0xf, function(a,v) { audio.pokey1.setRegister(a, v); }],
|
||||
[0x6800, 0x6fff, 0xf, function(a,v) { audio.pokey2.setRegister(a, v); }],
|
||||
[0x8800, 0x8800, 0, function(a,v) { /* LEDs, etc */ }],
|
||||
[0x8840, 0x8840, 0, function(a,v) { dvg.runUntilHalt(0); }],
|
||||
[0x8880, 0x8880, 0, function(a,v) { dvg.reset(); }],
|
||||
|
|
@ -223,7 +236,7 @@ var AtariColorVectorPlatform = function(mainElement) {
|
|||
// create video/audio
|
||||
video = new VectorVideo(mainElement,1024,1024);
|
||||
dvg = new DVGColorStateMachine(bus, video, 0x2000);
|
||||
audio = new SampleAudio(cpuFrequency);
|
||||
audio = newPOKEYAudio();
|
||||
video.create();
|
||||
timer = new AnimationTimer(60, function() {
|
||||
video.clear();
|
||||
|
|
@ -260,9 +273,11 @@ var AtariColorVectorPlatform = function(mainElement) {
|
|||
}
|
||||
this.pause = function() {
|
||||
timer.stop();
|
||||
audio.stop();
|
||||
}
|
||||
this.resume = function() {
|
||||
timer.start();
|
||||
audio.start();
|
||||
}
|
||||
this.reset = function() {
|
||||
this.clearDebug();
|
||||
|
|
@ -322,6 +337,8 @@ var Z80ColorVectorPlatform = function(mainElement, proto) {
|
|||
]),
|
||||
|
||||
write: new AddressDecoder([
|
||||
[0x8000, 0x800f, 0xf, function(a,v) { audio.pokey1.setRegister(a, v); }],
|
||||
[0x8010, 0x801f, 0xf, function(a,v) { audio.pokey2.setRegister(a, v); }],
|
||||
[0x8840, 0x8840, 0, function(a,v) { dvg.runUntilHalt(0); }],
|
||||
[0x8880, 0x8880, 0, function(a,v) { dvg.reset(); }],
|
||||
[0xa000, 0xdfff, 0x3fff, function(a,v) { dvgram.mem[a] = v; }],
|
||||
|
|
@ -333,7 +350,7 @@ var Z80ColorVectorPlatform = function(mainElement, proto) {
|
|||
// create video/audio
|
||||
video = new VectorVideo(mainElement,1024,1024);
|
||||
dvg = new DVGColorStateMachine(bus, video, 0xa000);
|
||||
audio = new SampleAudio(cpuFrequency);
|
||||
audio = newPOKEYAudio();
|
||||
video.create();
|
||||
timer = new AnimationTimer(60, function() {
|
||||
video.clear();
|
||||
|
|
@ -358,9 +375,11 @@ var Z80ColorVectorPlatform = function(mainElement, proto) {
|
|||
}
|
||||
this.pause = function() {
|
||||
timer.stop();
|
||||
audio.stop();
|
||||
}
|
||||
this.resume = function() {
|
||||
timer.start();
|
||||
audio.start();
|
||||
}
|
||||
this.reset = function() {
|
||||
cpu.reset();
|
||||
|
|
|
|||
Loading…
Reference in New Issue