76 lines
1.3 KiB
JavaScript
76 lines
1.3 KiB
JavaScript
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import DataMap from './DataMap.js';
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import { AttributeType } from './Constants.js';
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import { DynamicDrawUsage } from 'three';
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class Attributes extends DataMap {
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constructor( backend ) {
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super();
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this.backend = backend;
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}
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delete( attribute ) {
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const attributeData = super.delete( attribute );
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if ( attributeData !== undefined ) {
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this.backend.destroyAttribute( attribute );
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}
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}
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update( attribute, type ) {
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const data = this.get( attribute );
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if ( data.version === undefined ) {
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if ( type === AttributeType.VERTEX ) {
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this.backend.createAttribute( attribute );
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} else if ( type === AttributeType.INDEX ) {
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this.backend.createIndexAttribute( attribute );
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} else if ( type === AttributeType.STORAGE ) {
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this.backend.createStorageAttribute( attribute );
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}
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data.version = this._getBufferAttribute( attribute ).version;
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} else {
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const bufferAttribute = this._getBufferAttribute( attribute );
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if ( data.version < bufferAttribute.version || bufferAttribute.usage === DynamicDrawUsage ) {
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this.backend.updateAttribute( attribute );
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data.version = bufferAttribute.version;
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}
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}
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}
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_getBufferAttribute( attribute ) {
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if ( attribute.isInterleavedBufferAttribute ) attribute = attribute.data;
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return attribute;
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}
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}
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export default Attributes;
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