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fixed POKEY/TIA sound

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This commit is contained in:
Steven Hugg 2019-08-14 13:32:38 -04:00
parent 9bdec710d7
commit 018113f858
1 changed files with 36 additions and 19 deletions
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55
src/audio.ts
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@ -73,6 +73,22 @@ export function newPOKEYAudio(count:number) {
return audio;
}
function combinePolys(a, b) {
var arr = new Uint8Array(a.length * b.length);
var n = 0;
for (var i=0; i<arr.length; i++) {
arr[i] = b[n % b.length];
if (a[i % a.length]) n++;
}
return arr;
}
function divideBy(n) {
var arr = new Uint8Array(n*2);
arr.fill(1, 0, n);
return arr;
}
export var POKEYDeviceChannel = function() {
/* definitions for AUDCx (D201, D203, D205, D207) */
@ -119,37 +135,38 @@ export var POKEYDeviceChannel = function() {
var FREQ_17_APPROX = 1787520.0 /* approximate 1.79 MHz clock freq */
// LFSR sequences
var bit1 = new Uint8Array( [ 0,1 ] );
var bit1 = new Uint8Array( [ 1 ] );
var bit2 = new Uint8Array( [ 0,1 ] ); // TODO?
var bit4 = new Uint8Array( [ 1,1,0,1,1,1,0,0,0,0,1,0,1,0,0 ] );
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 ] );
var bit9 = new Uint8Array( [ 0,0,1,0,1,0,0,0,1,0,0,0,0,0,0,0,1,0,1,1,1,0,0,1,0,1,0,0,1,1,1,1,1,0,0,1,1,0,1,1,0,1,0,1,1,1,0,1,1,0,0,1,0,0,1,1,1,1,0,1,0,0,0,0,1,1,0,1,1,0,0,0,1,0,0,0,1,1,1,1,0,1,0,1,1,0,1,0,1,0,0,0,0,1,1,0,1,0,1,0,0,0,1,0,1,0,0,0,1,1,1,0,0,1,1,0,1,1,0,0,1,1,1,1,1,0,0,1,1,0,0,0,1,1,0,1,0,0,0,1,1,0,0,1,1,1,1,0,0,1,0,0,0,1,1,1,0,0,1,1,0,1,0,1,1,0,1,1,0,1,0,0,1,0,0,1,1,1,1,1,1,0,1,1,1,1,0,1,1,0,0,0,0,1,1,1,1,1,0,0,0,1,0,0,0,0,1,0,0,0,1,0,1,0,1,1,0,0,0,0,1,0,1,1,1,1,0,1,0,0,0,1,1,0,0,0,1,1,1,0,1,1,1,0,1,0,0,0,0,0,0,0,0,1,0,1,0,0,1,0,0,0,0,1,1,1,0,0,0,1,1,1,0,0,1,1,0,0,1,0,0,1,0,1,1,0,0,0,0,1,0,0,0,1,0,0,0,1,0,1,1,1,1,0,0,0,1,1,1,0,0,0,1,0,0,1,1,1,1,0,1,1,1,1,1,1,1,0,1,1,1,1,1,1,0,1,1,0,1,0,1,1,1,1,0,0,1,0,1,0,1,1,1,0,0,0,0,0,1,1,0,1,1,0,0,0,1,0,1,0,1,0,0,0,0,1,0,1,1,1,0,0,0,0,1,0,0,1,0,1,0,0,0,1,0,1,1,1,0,0,1,1,1,1,1,1,1,0,0,0,0,0,1,0,0,1,1,0,1,0,0,1,0,0,0,1,0,0,1,0,1,0,0,0,1,1,0,1,0,0,0,0,0,1,1,1,1,0,0,1,0,0,1,0,1,1,1,1,1,1,1,0,1,0,0,1,0,0,0,1,1,0,1,1,1,0,0,0,1,0,1,0,0,1,0,1,0,1,0,1,1,1,0,0,1,0,1,1,0,0,1,1,1,1,1,0,0,0,1,1,0 ] );
var div31 = new Uint8Array( [ 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0 ] );
var bit17 = new Uint8Array(1<<17);
var bit17_5 = new Uint8Array(1<<17);
var bit5_4 = new Uint8Array(1<<9);
// TODO
var bit6 = bit9;
var bit15_4 = bit5_4;
var bit5_2 = bit5_4;
var bit5_6 = bit5_4;
var bit31 = bit9;
var bit93 = bit31;
var bit15 = new Uint8Array( [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0] );
var bit31 = new Uint8Array( [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0] );
var bit17 = new Uint8Array(1<<14);
for (var i=0; i<bit17.length; i++) {
bit17[i] = Math.random() > 0.5 ? 1 : 0;
bit17_5[i] = bit17[i] & bit5[i % bit5.length];
bit5_4[i] = bit5[i % bit5.length] & bit4[i % bit4.length];
}
var bit17_5 = combinePolys(bit17, bit5);
var bit5_4 = combinePolys(bit5, bit4);
var wavetones = [
bit17_5, bit5, bit5_4, bit5,
bit17, bit1, bit4, bit1
bit17, bit2, bit4, bit2
];
// TIA
var div2 = divideBy(2);
var div6 = divideBy(6);
var div31 = divideBy(31);
var div93 = divideBy(93);
var bit15_4 = combinePolys(bit15, bit4);
var bit5_2 = combinePolys(bit5, div2);
var bit5_6 = combinePolys(bit5, div6);
var tiawavetones = [
bit1, bit4, bit15_4, bit5_4,
bit1, bit1, bit31, bit5_2,
bit9, bit5, bit31, bit1,
bit6, bit6, bit93, bit5_6
div2, div2, div31, bit5_2,
bit9, bit5, div31, bit1,
div6, div6, div93, bit5_6
];
// registers
var regs = new Uint8Array(16);
var counters = new Float32Array(4);