* Simulates the image loader's tryLoadSource logic: * - For compressed formats: fetch as arrayBuffer, parse, verify format support * - For standard images: fetch as blob, create bitmap * * @param {string} src - source path * @param {string} name - cache key * @param {Map }
(src, name, fileServer, supportedFormats, imgCache)
| 35 | * @returns {Promise} |
| 36 | */ |
| 37 | function tryLoadSource(src, name, fileServer, supportedFormats, imgCache) { |
| 38 | const ext = src.split(".").pop().toLowerCase(); |
| 39 | |
| 40 | // Simulate fetching — reject if file not found |
| 41 | const data = fileServer.get(src); |
| 42 | if (!data) { |
| 43 | return Promise.reject(new Error("404 Not Found: " + src)); |
| 44 | } |
| 45 | |
| 46 | switch (ext) { |
| 47 | case "dds": |
| 48 | case "pvr": |
| 49 | case "pkm": |
| 50 | case "ktx": |
| 51 | case "ktx2": { |
| 52 | return new Promise((resolve, reject) => { |
| 53 | try { |
| 54 | let texture; |
| 55 | switch (ext) { |
| 56 | case "dds": |
| 57 | texture = parseDDS(data); |
| 58 | break; |
| 59 | case "pvr": |
| 60 | texture = parsePVR(data); |
| 61 | break; |
| 62 | case "pkm": |
| 63 | texture = parsePKM(data); |
| 64 | break; |
| 65 | case "ktx": |
| 66 | texture = parseKTX(data); |
| 67 | break; |
| 68 | case "ktx2": |
| 69 | texture = parseKTX2(data); |
| 70 | break; |
| 71 | } |
| 72 | // post-parse: check if the GPU supports this specific format |
| 73 | if (supportedFormats.has(texture.format)) { |
| 74 | imgCache[name] = texture; |
| 75 | resolve(); |
| 76 | } else { |
| 77 | reject( |
| 78 | new Error( |
| 79 | "unsupported texture format: " + |
| 80 | ext + |
| 81 | " (0x" + |
| 82 | texture.format.toString(16) + |
| 83 | ")", |
| 84 | ), |
| 85 | ); |
| 86 | } |
| 87 | } catch (e) { |
| 88 | reject(e); |
| 89 | } |
| 90 | }); |
| 91 | } |
| 92 | |
| 93 | // Standard image (png, jpg, etc.) |
| 94 | default: |