@loaders.gl/3d-tiles
Version:
3D Tiles, an open standard for streaming massive heterogeneous 3D geospatial datasets.
113 lines • 3.91 kB
JavaScript
// loaders.gl
// SPDX-License-Identifier: MIT
// Copyright vis.gl contributors
import { GLType } from '@loaders.gl/math'; // '@math.gl/geometry';
import { assert } from '@loaders.gl/loader-utils';
const COMPONENTS_PER_ATTRIBUTE = {
SCALAR: 1,
VEC2: 2,
VEC3: 3,
VEC4: 4,
MAT2: 4,
MAT3: 9,
MAT4: 16
};
// TODO - could just return typed array views...
// prettier-ignore
const UNPACKER = {
SCALAR: (values, i) => values[i],
VEC2: (values, i) => [values[2 * i + 0], values[2 * i + 1]],
VEC3: (values, i) => [values[3 * i + 0], values[3 * i + 1], values[3 * i + 2]],
VEC4: (values, i) => [values[4 * i + 0], values[4 * i + 1], values[4 * i + 2], values[4 * i + 3]],
// TODO: check column major
MAT2: (values, i) => [
values[4 * i + 0], values[4 * i + 1],
values[4 * i + 2], values[4 * i + 3]
],
MAT3: (values, i) => [
values[9 * i + 0], values[9 * i + 1], values[9 * i + 2],
values[9 * i + 3], values[9 * i + 4], values[9 * i + 5],
values[9 * i + 6], values[9 * i + 7], values[9 * i + 8]
],
MAT4: (values, i) => [
values[16 * i + 0], values[16 * i + 1], values[16 * i + 2], values[16 * i + 3],
values[16 * i + 4], values[16 * i + 5], values[16 * i + 6], values[16 * i + 7],
values[16 * i + 8], values[16 * i + 9], values[16 * i + 10], values[16 * i + 11],
values[16 * i + 12], values[16 * i + 13], values[16 * i + 14], values[16 * i + 15]
]
};
const PACKER = {
SCALAR: (x, values, i) => {
values[i] = x;
},
VEC2: (x, values, i) => {
values[2 * i + 0] = x[0];
values[2 * i + 1] = x[1];
},
VEC3: (x, values, i) => {
values[3 * i + 0] = x[0];
values[3 * i + 1] = x[1];
values[3 * i + 2] = x[2];
},
VEC4: (x, values, i) => {
values[4 * i + 0] = x[0];
values[4 * i + 1] = x[1];
values[4 * i + 2] = x[2];
values[4 * i + 3] = x[3];
},
// TODO: check column major correctness
MAT2: (x, values, i) => {
values[4 * i + 0] = x[0];
values[4 * i + 1] = x[1];
values[4 * i + 2] = x[2];
values[4 * i + 3] = x[3];
},
MAT3: (x, values, i) => {
values[9 * i + 0] = x[0];
values[9 * i + 1] = x[1];
values[9 * i + 2] = x[2];
values[9 * i + 3] = x[3];
values[9 * i + 4] = x[4];
values[9 * i + 5] = x[5];
values[9 * i + 6] = x[6];
values[9 * i + 7] = x[7];
values[9 * i + 8] = x[8];
values[9 * i + 9] = x[9];
},
MAT4: (x, values, i) => {
values[16 * i + 0] = x[0];
values[16 * i + 1] = x[1];
values[16 * i + 2] = x[2];
values[16 * i + 3] = x[3];
values[16 * i + 4] = x[4];
values[16 * i + 5] = x[5];
values[16 * i + 6] = x[6];
values[16 * i + 7] = x[7];
values[16 * i + 8] = x[8];
values[16 * i + 9] = x[9];
values[16 * i + 10] = x[10];
values[16 * i + 11] = x[11];
values[16 * i + 12] = x[12];
values[16 * i + 13] = x[13];
values[16 * i + 14] = x[14];
values[16 * i + 15] = x[15];
}
};
export function createTypedArrayFromAccessor(tile3DAccessor, buffer, byteOffset, length) {
const { componentType } = tile3DAccessor;
assert(tile3DAccessor.componentType);
const type = typeof componentType === 'string' ? GLType.fromName(componentType) : componentType;
const size = COMPONENTS_PER_ATTRIBUTE[tile3DAccessor.type];
const unpacker = UNPACKER[tile3DAccessor.type];
const packer = PACKER[tile3DAccessor.type];
byteOffset += tile3DAccessor.byteOffset;
const values = GLType.createTypedArray(type, buffer, byteOffset, size * length);
return {
values,
type,
size,
unpacker,
packer
};
}
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