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