HashNode.js 798 B

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  1. import Node, { addNodeClass } from '../core/Node.js';
  2. import { addNodeElement, nodeProxy } from '../shadernode/ShaderNode.js';
  3. class HashNode extends Node {
  4. constructor( seedNode ) {
  5. super();
  6. this.seedNode = seedNode;
  7. }
  8. setup( /*builder*/ ) {
  9. // Taken from https://www.shadertoy.com/view/XlGcRh, originally from pcg-random.org
  10. const state = this.seedNode.toUint().mul( 747796405 ).add( 2891336453 );
  11. const word = state.shiftRight( state.shiftRight( 28 ).add( 4 ) ).bitXor( state ).mul( 277803737 );
  12. const result = word.shiftRight( 22 ).bitXor( word );
  13. return result.toFloat().mul( 1 / 2 ** 32 ); // Convert to range [0, 1)
  14. }
  15. }
  16. export default HashNode;
  17. export const hash = nodeProxy( HashNode );
  18. addNodeElement( 'hash', hash );
  19. addNodeClass( 'HashNode', HashNode );