Accueil / npm / three@0.172.0 / src / renderers / common / StorageInstancedBufferAttribute.js
StorageInstancedBufferAttribute.js
import { InstancedBufferAttribute } from '../../core/InstancedBufferAttribute.js';
/**
* This special type of instanced buffer attribute is intended for compute shaders.
* In earlier three.js versions it was only possible to update attribute data
* on the CPU via JavaScript and then upload the data to the GPU. With the
* new material system and renderer it is now possible to use compute shaders
* to compute the data for an attribute more efficiently on the GPU.
*
* The idea is to create an instance of this class and provide it as an input
* to {@link module:StorageBufferNode}.
*
* Note: This type of buffer attribute can only be used with `WebGPURenderer`.
*
* @augments InstancedBufferAttribute
*/
class StorageInstancedBufferAttribute extends InstancedBufferAttribute {
/**
* Constructs a new storage instanced buffer attribute.
*
* @param {Number|TypedArray} count - The item count. It is also valid to pass a typed array as an argument.
* The subsequent parameters are then obsolete.
* @param {Number} itemSize - The item size.
* @param {TypedArray.contructor} [typeClass=Float32Array] - A typed array constructor.
*/
constructor( count, itemSize, typeClass = Float32Array ) {
const array = ArrayBuffer.isView( count ) ? count : new typeClass( count * itemSize );
super( array, itemSize );
/**
* This flag can be used for type testing.
*
* @type {Boolean}
* @readonly
* @default true
*/
this.isStorageInstancedBufferAttribute = true;
}
}
export default StorageInstancedBufferAttribute;