16 lines
842 B
JavaScript
16 lines
842 B
JavaScript
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import { sub, mul, div, add } from './OperatorNode.js';
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import { addNodeElement } from '../shadernode/ShaderNode.js';
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import { PI, pow, sin } from './MathNode.js';
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// remapping functions https://iquilezles.org/articles/functions/
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export const parabola = ( x, k ) => pow( mul( 4.0, x.mul( sub( 1.0, x ) ) ), k );
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export const gain = ( x, k ) => x.lessThan( 0.5 ) ? parabola( x.mul( 2.0 ), k ).div( 2.0 ) : sub( 1.0, parabola( mul( sub( 1.0, x ), 2.0 ), k ).div( 2.0 ) );
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export const pcurve = ( x, a, b ) => pow( div( pow( x, a ), add( pow( x, a ), pow( sub( 1.0, x ), b ) ) ), 1.0 / a );
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export const sinc = ( x, k ) => sin( PI.mul( k.mul( x ).sub( 1.0 ) ) ).div( PI.mul( k.mul( x ).sub( 1.0 ) ) );
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addNodeElement( 'parabola', parabola );
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addNodeElement( 'gain', gain );
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addNodeElement( 'pcurve', pcurve );
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addNodeElement( 'sinc', sinc );
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