80 lines
1.6 KiB
JavaScript
80 lines
1.6 KiB
JavaScript
import Check from "../Core/Check.js";
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/**
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* An enum describing the built-in instance attribute semantics.
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*
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* @enum {string}
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*
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* @private
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*/
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const InstanceAttributeSemantic = {
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/**
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* Per-instance translation.
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*
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* @type {string}
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* @constant
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*/
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TRANSLATION: "TRANSLATION",
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/**
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* Per-instance rotation.
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*
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* @type {string}
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* @constant
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*/
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ROTATION: "ROTATION",
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/**
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* Per-instance scale.
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*
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* @type {string}
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* @constant
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*/
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SCALE: "SCALE",
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/**
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* Per-instance feature ID.
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*
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* @type {string}
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* @constant
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*/
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FEATURE_ID: "_FEATURE_ID",
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};
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/**
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* Gets the instance attribute semantic matching the glTF attribute semantic.
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*
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* @returns {InstanceAttributeSemantic} The instance attribute semantic, or undefined if there is no match.
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*
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* @private
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*/
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InstanceAttributeSemantic.fromGltfSemantic = function (gltfSemantic) {
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//>>includeStart('debug', pragmas.debug);
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Check.typeOf.string("gltfSemantic", gltfSemantic);
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//>>includeEnd('debug')
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let semantic = gltfSemantic;
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// Strip the set index from the semantic
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const setIndexRegex = /^(\w+)_\d+$/;
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const setIndexMatch = setIndexRegex.exec(gltfSemantic);
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if (setIndexMatch !== null) {
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semantic = setIndexMatch[1];
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}
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switch (semantic) {
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case "TRANSLATION":
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return InstanceAttributeSemantic.TRANSLATION;
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case "ROTATION":
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return InstanceAttributeSemantic.ROTATION;
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case "SCALE":
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return InstanceAttributeSemantic.SCALE;
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case "_FEATURE_ID":
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return InstanceAttributeSemantic.FEATURE_ID;
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}
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return undefined;
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};
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export default Object.freeze(InstanceAttributeSemantic);
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