106 lines
1.7 KiB
JavaScript
106 lines
1.7 KiB
JavaScript
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function mod(a,b) {
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return ((a % b) + b) % b;
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}
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function sine() {
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const a = 127;
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const p = 256;
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var rv = [];
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for (var n = 0; n < 256; ++n) {
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var x = 128 + Math.round(a * Math.sin(n * Math.PI / 128));
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rv.push( x || 1 );
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}
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return rv;
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}
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function square() {
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var rv = [];
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for (var n = 0; n < 128; ++n) rv.push(255);
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for (var n = 0; n < 128; ++n) rv.push(1);
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return rv;
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}
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function triangle() {
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// 0x80 -> 0xff [25%] -> 0x80 [50%] -> 0x01 [75%] -> 0x80 [100%]
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var rv = [];
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const a = 127;
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const p = 256;
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for (var n = 0; n < 256; ++n) {
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var x = 128 + Math.round(4*a/p * Math.abs(mod(n-p/4, p) - p/2)) - a;
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rv.push(x || 1);
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}
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return rv;
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}
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function sawtooth() {
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var rv = [];
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const a = 127;
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const p = 256;
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for (var n = 0; n < 256; ++n) {
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var x = 128 + Math.round(a * 2 * (n/p - Math.floor(.5 + n/p)));
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rv.push(x || 1);
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}
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return rv;
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}
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export function WaveData(props) {
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var {assembler, shape} = props;
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var data;
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switch(shape) {
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case 0: data = sine(); break;
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case 1: data = square(); break;
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case 2: data = triangle(); break;
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case 3: data = sawtooth(); break;
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}
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var hex = data.map( (x) => x < 0x10 ? "0" + x.toString(16) : x.toString(16) );
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var code = [];
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if (assembler == 0) {
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// merlin
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for (var n = 0; n < 16; ++n) {
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var line = " hex " + hex.slice(n * 16, n * 16 + 16).join("") + "\n"
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code.push(line);
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}
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}
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if (assembler == 1) {
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// orca/m
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for (var n = 0; n < 16; ++n) {
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var line = " dc h'" + hex.slice(n * 16, n * 16 + 16).join("") + "'\n"
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code.push(line);
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}
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}
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if (assembler == 2) {
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// mpw
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for (var n = 0; n < 32; ++n) {
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var line = " dc.b $" + hex.slice(n * 8, n * 8 + 8).join(",$") + "\n"
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code.push(line);
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}
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}
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return (
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<code>
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<pre>
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{code}
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</pre>
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</code>
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);
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}
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