338 lines
7.0 KiB
JavaScript
338 lines
7.0 KiB
JavaScript
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// var h = preact.h;
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import { NoteInput, NoteFrequency } from './note_input';
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import { RadioGroup } from './radio_group';
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import { WaveData } from './wave_data';
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function calc_sr(osc) {
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// iigs is ~7.14Mhz / 8. Mirage is 8Mhz / 8
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// return (28.63636*1000*1000/32) / (osc + 2);
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return (28_636_360/32) / (osc + 2);
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}
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function calc_shift(res,ws) {
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return res + 9 - ws;
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}
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function log2(x) {
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var y = Math.log2(x);
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return (y >> 0) === y ? y : false;
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}
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var _onames = [];
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function Oscillators(props) {
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if (!_onames.length) {
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for (var i = 1; i < 33; ++i) {
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var x = (calc_sr(i) / 1000 ).toFixed(2) + " kHz";
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_onames.push(x)
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}
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}
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var options = _onames.map( (x, ix) => {
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var i = ix + 1;
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return <option value={i} key={i}>{i} – {x}</option>
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});
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// for (var i = 1; i < 33; ++i) {
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// options.push(<option value={i} key={i}>{i}</option>);
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// }
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return <select value={props.value} onChange={props.onChange}>{options}</select>;
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}
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function WaveSize(props) {
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var options = []
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for (var i = 8; i < 16; ++i) {
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var ext = 1 << i;
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var int = i - 8;
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options.push(<option value={int} key={int}>{ext}</option>);
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}
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return <select value={props.value} onChange={props.onChange}>{options}</select>;
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}
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function Resolution(props) {
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var options = []
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for (var i = 0; i < 8; ++i) {
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options.push(<option value={i} key={i}>{i}</option>);
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}
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return <select value={props.value} onChange={props.onChange}>{options}</select>;
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}
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function Frequency(props) {
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/* number, min, max are not as strict as they ought to be */
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return <input type="number" min="0" max="65535" value={props.value} onChange={props.onChange} />;
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}
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function Assembler(props) {
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var options = ["Merlin", "ORCA/M"].map( (o, ix) => {
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return <option key={ix} value={ix}>{o}</option>;
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});
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return <select {...props}>{options}</select>;
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}
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function WaveShape(props) {
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var options = ["Sine", "Square", "Triangle", "Sawtooth"].map( (o, ix) => {
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return <option key={ix} value={ix}>{o}</option>;
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});
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return <select {...props}>{options}</select>;
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}
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function nmultiply(x) {
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if (x == 0) return 0;
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if (x == 1) return <i>n</i>;
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return <>{x} * <i>n</i></>;
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// return paren ? <span>({x} * <i>n</i>)</span> : <span>{x} * <i>n</i></span>;
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}
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function SampleDisplay(props) {
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var { shift, freq } = props;
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var freq2 = log2(freq);
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var fspan = <span title="Frequency">{freq}</span>;
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var rv = [];
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rv.push(
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<div>
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Sample<sub>n</sub> = RAM[ ({fspan} * <i>n</i>) >> {shift} ]
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</div>
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);
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rv.push(
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<div>
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Sample<sub>n</sub> = RAM[ ({fspan} * <i>n</i>) / {1 << shift} ]
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</div>
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);
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if (freq2) {
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if (freq2 >= shift) {
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rv.push(
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<div>
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Sample<sub>n</sub> = RAM[ { nmultiply(freq / ( 1 << shift)) } ]
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</div>
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);
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} else {
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rv.push(
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<div>
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Sample<sub>n</sub> = RAM[ { nmultiply(freq >> freq2) } >> {shift - freq2} ]
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</div>
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);
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rv.push(
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<div>
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Sample<sub>n</sub> = RAM[ { nmultiply(freq >> freq2) } / { 1 << (shift - freq2) } ]
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</div>
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);
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}
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}
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return rv;
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}
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function NoteDisplay(props) {
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var { osc, note } = props;
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const wave = 0; // 256
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const sr = calc_sr(osc);
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const note_frq = NoteFrequency(note);
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const f = note_frq / (sr / (1 << (8 + wave)));
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// best_res = 7 - Math.ceil(Math.log2(f)) ?
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// best_freq = f * (1 << calc_shift(best_res, 0)) ?
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var best_res = 0;
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var best_freq = 0;
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for (var res = 0; res < 8; ++res) {
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var tmp = f * (1 << calc_shift(res, wave));
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if (tmp >= 0x10000) break;
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best_res = res;
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best_freq = tmp;
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}
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return (
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<>
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<div>Wave Size: 256</div>
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<div>Resolution: {best_res}</div>
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<div>Frequency: {Math.round(best_freq)}</div>
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</>
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);
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}
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// oscillators generate addresses, not samples.
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// accumulator is 24-bit.
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// frequency is 16-bit.
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// accumulator n = freq * n
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// sample n = memory[(freq * n) >> res. shift]
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export class Application extends preact.Component {
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constructor(props) {
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super(props);
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this._oscChange = this.oscChange.bind(this);
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this._waveChange = this.waveChange.bind(this);
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this._resChange = this.resChange.bind(this);
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this._freqChange = this.freqChange.bind(this);
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this._noteChange = this.noteChange.bind(this);
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this._tabChange = this.tabChange.bind(this);
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this._asmChange = this.asmChange.bind(this);
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this._shapeChange = this.shapeChange.bind(this);
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this.state = { osc: 32, wave: 0, res: 0, freq: 512, tab: 0, note: 4*12, assembler: 0, shape: 0 };
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}
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oscChange(e) {
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e.preventDefault();
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var v = +e.target.value || 0;
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this.setState( { osc: v } );
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}
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waveChange(e) {
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e.preventDefault();
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var v = +e.target.value || 0;
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this.setState( { wave: v } );
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}
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resChange(e) {
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e.preventDefault();
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var v = +e.target.value || 0;
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this.setState( { res: v } );
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}
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freqChange(e) {
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e.preventDefault();
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var v = +e.target.value >> 0;
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if (v < 0) v = 0;
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if (v > 65535) v = 65535;
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this.setState( { freq: v } );
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}
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tabChange(e) {
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e.preventDefault();
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var v = +e.target.value;
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this.setState({ tab: v });
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}
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noteChange(v) {
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this.setState({ note: v });
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}
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asmChange(e) {
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e.preventDefault();
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var v = +e.target.value;
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this.setState({ assembler: v});
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}
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shapeChange(e) {
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e.preventDefault();
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var v = +e.target.value;
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this.setState({ shape: v});
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}
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sampleChildren() {
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var { osc, wave, res, freq } = this.state;
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var shift = calc_shift(res, wave);
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return (
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<>
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<div>
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<label>Oscillators</label> <Oscillators value={osc} onChange={this._oscChange} />
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</div>
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<div>
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<label>Wave Size</label> <WaveSize value={wave} onChange={this._waveChange} />
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</div>
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<div>
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<label>Resolution</label> <Resolution value={res} onChange={this._resChange} />
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</div>
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<div>
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<label>Frequency</label> <Frequency value={freq} onChange={this._freqChange} />
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</div>
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<SampleDisplay freq={freq} shift={shift} />
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</>
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);
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}
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noteChildren() {
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var { osc, wave, note } = this.state;
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return (
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<>
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<div>
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<label>Oscillators</label> <Oscillators value={osc} onChange={this._oscChange} />
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</div>
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<div>
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<label>Note</label> <NoteInput value={note} onChange={this._noteChange} />
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</div>
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<NoteDisplay osc={osc} note={note} wave={wave} />
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</>
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);
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}
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waveChildren() {
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var { assembler, shape } = this.state;
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return (
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<>
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<div>
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<label>Assembler</label> <Assembler value={assembler} onChange={this._asmChange} />
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</div>
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<div>
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<label>Wave Type</label> <WaveShape value={shape} onChange={this._shapeChange} />
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</div>
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<WaveData assembler={assembler} shape={shape} />
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</>
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);
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}
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render() {
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var { osc, wave, res, freq, tab } = this.state;
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// var shift = calc_shift(res, wave);
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var children;
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switch(tab){
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case 0: children = this.sampleChildren(); break;
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case 1: children = this.noteChildren(); break;
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case 2: children = this.waveChildren(); break;
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}
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var options = ["Sample", "Note", "Wave"].map( (o, ix) => {
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return <option key={ix} value={ix}>{o}</option>;
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});
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return (
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<fieldset>
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<legend><select value={tab} onChange={this._tabChange}>{options}</select></legend>
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{children}
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</fieldset>
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);
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}
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}
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