35 lines
794 B
JavaScript
35 lines
794 B
JavaScript
import Node, { addNodeClass } from '../core/Node.js';
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import { addNodeElement, nodeProxy } from '../shadernode/ShaderNode.js';
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class HashNode extends Node {
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constructor( seedNode ) {
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super();
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this.seedNode = seedNode;
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}
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setup( /*builder*/ ) {
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// Taken from https://www.shadertoy.com/view/XlGcRh, originally from pcg-random.org
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const state = this.seedNode.uint().mul( 747796405 ).add( 2891336453 );
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const word = state.shiftRight( state.shiftRight( 28 ).add( 4 ) ).bitXor( state ).mul( 277803737 );
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const result = word.shiftRight( 22 ).bitXor( word );
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return result.float().mul( 1 / 2 ** 32 ); // Convert to range [0, 1)
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}
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}
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export default HashNode;
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export const hash = nodeProxy( HashNode );
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addNodeElement( 'hash', hash );
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addNodeClass( 'HashNode', HashNode );
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