sganggs
01a44cd288
Online co-op browser remake of Arknights' Stronghold Protocol: Alliance (client-simulated combat, official waves/bonds/items/strategies, 3D board, facing wheel, operator loadout, official emotes, deployment scripts).
46 lines
2.2 KiB
JavaScript
46 lines
2.2 KiB
JavaScript
// render/boardArt.js — optional real board art from the local game client (DESIGN §13).
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//
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// const art = await loadBoardArt(assets) // null when the art (or its crop table) is not installed
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// → { key, tiles, images: { D, common?, BG? } } (tiles = tiles.json of tools/crop-board-atlas.mjs)
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//
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// Discovery never guesses URLs: the local-art manifest (data/local-assets.json, assets.local()) must list the atlas
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// `map/autochess → TX_autochessi_D`; its crop table `tiles.json` sits next to it (written by
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// tools/crop-board-atlas.mjs). Every image referenced by the table is loaded through the shared image cache; a
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// missing image drops only the materials that use it. Everything is cached per page (one load for every view).
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let cached = null;
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const isObj = (v) => v !== null && typeof v === 'object' && !Array.isArray(v);
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/** @param {any} assets store of public/js/assets.js (needs local(), localUrl(), image()) */
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export function loadBoardArt(assets) {
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if (cached) return cached;
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cached = (async () => {
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if (!assets || typeof assets.local !== 'function' || typeof assets.image !== 'function') return null;
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const manifest = await assets.local().catch(() => null);
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if (!manifest) return null;
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const atlasUrl = assets.localUrl ? assets.localUrl('map/autochess', 'TX_autochessi_D') : null;
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if (!atlasUrl) return null;
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const dir = atlasUrl.replace(/\/[^/]*$/, '');
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let tiles = null;
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try {
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const res = await fetch(`${dir}/tiles.json`, { cache: 'no-cache' });
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tiles = res.ok ? await res.json() : null;
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} catch { tiles = null; }
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if (!isObj(tiles) || !isObj(tiles.materials) || !isObj(tiles.source)) return null;
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const images = {};
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await Promise.all(Object.entries(tiles.source).map(async ([k, s]) => {
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const url = isObj(s) && typeof s.path === 'string' ? s.path : null;
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if (!url) return;
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const img = await assets.image(url).catch(() => null);
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if (img && img.width > 0) images[k] = img;
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}));
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if (!images.D) return null;
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return { key: `${atlasUrl}#${tiles.version || 0}`, tiles, images };
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})().catch(() => null);
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return cached;
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}
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/** Forget the cached art (tests / hot reload). */
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export function resetBoardArt() { cached = null; }
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