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atlasing.js
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atlasing.js
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import * as THREE from 'three';
import {MaxRectsPacker} from 'maxrects-packer';
import {modUv} from './util.js';
import {startTextureAtlasSize, maxTextureAtlasSize} from './constants.js';
// const localVector = new THREE.Vector3();
// const localVector2 = new THREE.Vector3();
const localVector2D = new THREE.Vector2();
const localVector2D2 = new THREE.Vector2();
// const localVector4D = new THREE.Vector4();
// const localQuaternion = new THREE.Quaternion();
// const localMatrix = new THREE.Matrix4();
export const mapWarpedUvs = (src, srcOffset, dst, dstOffset, tx, ty, tw, th, canvasSize) => {
const count = src.count;
for (let i = 0; i < count; i++) {
const srcIndex = srcOffset + i * 2;
const localDstOffset = dstOffset + i * 2;
localVector2D.fromArray(src.array, srcIndex);
modUv(localVector2D);
localVector2D
.multiply(
localVector2D2.set(tw/canvasSize, th/canvasSize)
)
.add(
localVector2D2.set(tx/canvasSize, ty/canvasSize)
);
localVector2D.toArray(dst.array, localDstOffset);
}
};
const generateTextureAtlas = textureSpecs => {
const textureNames = Object.keys(textureSpecs);
const firstTextureArray = textureSpecs[textureNames[0]];
// compute texture sizes
const textureSizes = firstTextureArray.map((firstTexture, i) => {
/* const emissiveMap = emissiveMaps[i];
const normalMap = normalMaps[i];
const roughnessMap = roughnessMaps[i];
const metalnessMap = metalnessMaps[i]; */
const maxSize = new THREE.Vector2(0, 0);
for (const textureName of textureNames) {
const map = textureSpecs[textureName][i];
if (map) {
maxSize.x = Math.max(maxSize.x, map.image.width);
maxSize.y = Math.max(maxSize.y, map.image.height);
}
}
return maxSize;
});
const textureUuids = firstTextureArray.map((firstTexture, i) => {
/* const emissiveMap = emissiveMaps[i];
const normalMap = normalMaps[i];
const roughnessMap = roughnessMaps[i];
const metalnessMap = metalnessMaps[i]; */
const uuids = [];
for (const textureName of textureNames) {
const map = textureSpecs[textureName][i];
uuids.push(map ? map.uuid : null);
}
return uuids.join(':');
});
// generate atlas layouts
const _packAtlases = () => {
const _attemptPack = (textureSizes, atlasSize) => {
const maxRectsPacker = new MaxRectsPacker(atlasSize, atlasSize, 0);
const rectUuidCache = new Map();
const rectIndexCache = new Map();
textureSizes.forEach((textureSize, index) => {
const {x: width, y: height} = textureSize;
const hash = textureUuids[index];
let rect = rectUuidCache.get(hash);
if (!rect) {
rect = {
width,
height,
data: {
index,
},
};
rectUuidCache.set(hash, rect);
}
rectIndexCache.set(index, rect);
});
const rects = Array.from(rectUuidCache.values());
maxRectsPacker.addArray(rects);
let oversized = maxRectsPacker.bins.length > 1;
maxRectsPacker.bins.forEach(bin => {
bin.rects.forEach(rect => {
if (rect.oversized) {
oversized = true;
}
});
});
if (!oversized) {
maxRectsPacker.rectIndexCache = rectIndexCache;
return maxRectsPacker;
} else {
return null;
}
};
const hasTextures = textureSizes.some(textureSize => textureSize.x > 0 || textureSize.y > 0);
if (hasTextures) {
let atlas;
let atlasSize = startTextureAtlasSize;
while (!(atlas = _attemptPack(textureSizes, atlasSize))) {
atlasSize *= 2;
}
return atlas;
} else {
return null;
}
};
const atlas = _packAtlases();
// draw atlas images
const _drawAtlasImages = atlas => {
const _getTexturesKey = textures => textures.map(t => t ? t.uuid : '').join(',');
const _drawAtlasImage = (textureName, textures) => {
if (atlas && textures.some(t => t !== null)) {
const canvasSize = Math.min(atlas.width, maxTextureAtlasSize);
const canvasScale = canvasSize / atlas.width;
const canvas = document.createElement('canvas');
canvas.width = canvasSize;
canvas.height = canvasSize;
const initializer = textureInitializers[textureName];
if (initializer) {
initializer(canvas);
}
const ctx = canvas.getContext('2d');
atlas.bins.forEach(bin => {
bin.rects.forEach(rect => {
const {x, y, width: w, height: h, data: {index}} = rect;
const texture = textures[index];
if (texture) {
const image = texture.image;
// draw the image in the correct box on the canvas
const tx = x * canvasScale;
const ty = y * canvasScale;
const tw = w * canvasScale;
const th = h * canvasScale;
ctx.drawImage(image, 0, 0, image.width, image.height, tx, ty, tw, th);
}
});
});
return canvas;
} else {
return null;
}
};
const atlasImages = {};
const atlasImagesMap = new Map(); // cache to alias identical textures
for (const textureName of textureNames) {
const textures = textureSpecs[textureName];
const key = _getTexturesKey(textures);
// const textureName2 = textureName.replace(/s$/, '');
let atlasImage = atlasImagesMap.get(key);
if (atlasImage === undefined) { // cache miss
atlasImage = _drawAtlasImage(textureName, textures);
if (atlasImage !== null) {
atlasImage.key = key;
}
atlasImagesMap.set(key, atlasImage);
}
atlasImages[textureName] = atlasImage;
}
return atlasImages;
};
const atlasImages = _drawAtlasImages(atlas);
const atlasTextures = {};
for (const textureName of textureNames) {
const atlasImage = atlasImages[textureName];
if (atlasImage) {
const texture = new THREE.Texture(atlasImage);
texture.flipY = false;
texture.encoding = THREE.sRGBEncoding;
texture.needsUpdate = true;
atlasTextures[textureName] = texture;
}
}
return {
atlas,
atlasImages,
atlasTextures,
};
};
/* const textureTypes = [
'map',
'normalMap',
'roughnessMap',
'metalnessMap',
'emissiveMap',
]; */
const _colorCanvas = (canvas, fillStyle) => {
const ctx = canvas.getContext('2d');
ctx.fillStyle = fillStyle;
ctx.fillRect(0, 0, canvas.width, canvas.height);
};
const textureInitializers = {
normalMap(canvas) {
_colorCanvas(canvas, 'rgb(128, 128, 255)');
},
roughnessMap(canvas) {
_colorCanvas(canvas, 'rgb(255, 255, 255)');
},
/* metalness(canvas) {
_colorCanvas(canvas, 'rgb(0, 0, 0)');
}, */
};
export const createTextureAtlas = (meshes, {
textures = 'map',
attributes = ['position', 'normal', 'uv'],
} = {}) => {
const textureSpecs = {};
for (const textureName of textures) {
textureSpecs[textureName] = meshes.map(mesh => mesh.material[textureName]);
}
const {
atlas,
atlasImages,
atlasTextures,
} = generateTextureAtlas(textureSpecs);
const canvasSize = Math.min(atlas.width, maxTextureAtlasSize);
const canvasScale = canvasSize / atlas.width;
// geometry
const geometries = meshes.map((m, i) => {
const srcGeometry = m.geometry;
const geometry = new THREE.BufferGeometry();
for (const k of attributes) {
const attr = srcGeometry.attributes[k];
geometry.setAttribute(k, attr);
}
geometry.setIndex(srcGeometry.index);
const rect = atlas.rectIndexCache.get(i);
const {x, y, width: w, height: h} = rect;
const tx = x * canvasScale;
const ty = y * canvasScale;
const tw = w * canvasScale;
const th = h * canvasScale;
mapWarpedUvs(geometry.attributes.uv, 0, geometry.attributes.uv, 0, tx, ty, tw, th, canvasSize);
return geometry;
});
return {
atlas,
atlasImages,
atlasTextures,
geometries,
};
};