Making atlas from several images
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import { | |
Texture, | |
ImageLoader, | |
RGBFormat, | |
CanvasTexture, | |
} from "../build/three.module.js"; | |
export const makeAtlas = (images, size, width, height) => { | |
return new Promise((resolve) => { | |
loadAllImages(images).then((data) => | |
composeToOneImage(data, size, width, height).then((texture) => | |
resolve(texture) | |
) | |
); | |
}); | |
}; | |
const composeToOneImage = (images, size, width, height) => { | |
return new Promise((resolve) => { | |
console.time("canvas"); | |
let texture | |
const extractCanvas = document.createElement("canvas"); | |
extractCanvas.width = width; | |
extractCanvas.height = height; | |
const graphics = extractCanvas.getContext("2d"); | |
const columnsCount = width / size; | |
let x = 0; | |
let y = 0; | |
images.map((img) => { | |
if (x > columnsCount - 1) { | |
x = 0; | |
y++; | |
} | |
graphics.drawImage(img, x * size, y * size, size, size); | |
x++; | |
}); | |
texture = new CanvasTexture(extractCanvas); | |
texture.format = RGBFormat; | |
texture.needsUpdate = true; | |
texture.flipY = false; | |
resolve(texture); | |
console.timeEnd("canvas"); | |
}); | |
}; | |
const loadAllImages = (array) => { | |
return Promise.all(array.map((item) => imageLoader(item))); | |
}; | |
const imageLoader = (url) => { | |
return new Promise((resolve, reject) => { | |
let loader = new ImageLoader(); | |
loader.load( | |
url, | |
(img) => { | |
resolve(img); | |
}, | |
() => { | |
reject(); | |
} | |
); | |
}); | |
}; |
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