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