55 lines
1.7 KiB
JavaScript
55 lines
1.7 KiB
JavaScript
import getAccessorByteStride from "./getAccessorByteStride.js";
|
|
import getComponentReader from "./getComponentReader.js";
|
|
import numberOfComponentsForType from "./numberOfComponentsForType.js";
|
|
import ComponentDatatype from "../../Core/ComponentDatatype.js";
|
|
import defined from "../../Core/defined.js";
|
|
|
|
/**
|
|
* Returns the accessor data in a contiguous array.
|
|
*
|
|
* @param {object} gltf A javascript object containing a glTF asset.
|
|
* @param {object} accessor The accessor.
|
|
* @returns {Array} The accessor values in a contiguous array.
|
|
*
|
|
* @private
|
|
*/
|
|
function readAccessorPacked(gltf, accessor) {
|
|
const byteStride = getAccessorByteStride(gltf, accessor);
|
|
const componentTypeByteLength = ComponentDatatype.getSizeInBytes(
|
|
accessor.componentType
|
|
);
|
|
const numberOfComponents = numberOfComponentsForType(accessor.type);
|
|
const count = accessor.count;
|
|
const values = new Array(numberOfComponents * count);
|
|
|
|
if (!defined(accessor.bufferView)) {
|
|
return values.fill(0);
|
|
}
|
|
|
|
const bufferView = gltf.bufferViews[accessor.bufferView];
|
|
const source = gltf.buffers[bufferView.buffer].extras._pipeline.source;
|
|
let byteOffset =
|
|
accessor.byteOffset + bufferView.byteOffset + source.byteOffset;
|
|
|
|
const dataView = new DataView(source.buffer);
|
|
const components = new Array(numberOfComponents);
|
|
const componentReader = getComponentReader(accessor.componentType);
|
|
|
|
for (let i = 0; i < count; ++i) {
|
|
componentReader(
|
|
dataView,
|
|
byteOffset,
|
|
numberOfComponents,
|
|
componentTypeByteLength,
|
|
components
|
|
);
|
|
for (let j = 0; j < numberOfComponents; ++j) {
|
|
values[i * numberOfComponents + j] = components[j];
|
|
}
|
|
byteOffset += byteStride;
|
|
}
|
|
return values;
|
|
}
|
|
|
|
export default readAccessorPacked;
|