51 lines
1.3 KiB
JavaScript
51 lines
1.3 KiB
JavaScript
/**
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* Generated data tables for BG1 scaling
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*/
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const RATIOS = [0.5, 0.63, 0.75, 0.87, 1.0, 1.125, 1.25, 1.375, 1.5, 1.66, 1.83, 2.0, 2.5, 3.0, 3.5, 4.0];
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const NUM_SCALES = RATIOS.length;
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main(process.argv.slice(2)).then(
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() => process.exit(0),
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(e) => {
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console.error(e);
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process.exit(1);
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}
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);
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function toHex(n) {
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return '$' + n.toString(16).toUpperCase().padStart(4, '0');
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}
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async function main(argv) {
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const _ = console.log;
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for (let i = 0; i < NUM_SCALES; i += 1) {
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const arr = gen_scale_table(RATIOS[i]).map(n => toHex(n)).join(',');
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_(`Scale${i} dw ${arr}`);
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}
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}
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function gen_scale_table(ratio) {
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// Take a bunch of values from 0 to 162 (82 total). Use the middle as a reference
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// and scale out based on the (inverse) ratio, e.g. a ratio of 2 will double the pixels
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const ref = Array.from({ length: 82 }, (_, i) => i * 2);
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const center = 40.5;
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const factor = 1. / ratio;
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const table = [];
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for (let i = 0; i < 82; i++) {
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let index = 2 * Math.floor(center + (factor * (i - center)));
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while (index < 0) {
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index += 162;
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}
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while (index > 162) {
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index -= 162;
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}
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table.push(index);
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}
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return table;
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}
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