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102 lines
2.0 KiB
102 lines
2.0 KiB
2 years ago
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import { TempNode } from '../core/TempNode.js';
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import { FunctionNode } from '../core/FunctionNode.js';
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import { MaxMIPLevelNode } from './MaxMIPLevelNode.js';
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class SpecularMIPLevelNode extends TempNode {
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constructor( roughness, texture ) {
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super( 'f' );
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this.roughness = roughness;
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this.texture = texture;
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this.maxMIPLevel = undefined;
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}
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setTexture( texture ) {
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this.texture = texture;
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return this;
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}
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generate( builder, output ) {
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if ( builder.isShader( 'fragment' ) ) {
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this.maxMIPLevel = this.maxMIPLevel || new MaxMIPLevelNode();
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this.maxMIPLevel.texture = this.texture;
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const getSpecularMIPLevel = builder.include( SpecularMIPLevelNode.Nodes.getSpecularMIPLevel );
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return builder.format( getSpecularMIPLevel + '( ' + this.roughness.build( builder, 'f' ) + ', ' + this.maxMIPLevel.build( builder, 'f' ) + ' )', this.type, output );
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} else {
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console.warn( 'THREE.SpecularMIPLevelNode is not compatible with ' + builder.shader + ' shader.' );
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return builder.format( '0.0', this.type, output );
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}
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}
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copy( source ) {
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super.copy( source );
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this.texture = source.texture;
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this.roughness = source.roughness;
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return this;
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}
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toJSON( meta ) {
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let data = this.getJSONNode( meta );
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if ( ! data ) {
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data = this.createJSONNode( meta );
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data.texture = this.texture;
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data.roughness = this.roughness;
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}
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return data;
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}
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}
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SpecularMIPLevelNode.Nodes = ( function () {
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// taken from here: http://casual-effects.blogspot.ca/2011/08/plausible-environment-lighting-in-two.html
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const getSpecularMIPLevel = new FunctionNode( /* glsl */`
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float getSpecularMIPLevel( const in float roughness, const in float maxMIPLevelScalar ) {
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float sigma = PI * roughness * roughness / ( 1.0 + roughness );
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float desiredMIPLevel = maxMIPLevelScalar + log2( sigma );
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return clamp( desiredMIPLevel, 0.0, maxMIPLevelScalar );
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}`
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);
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return {
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getSpecularMIPLevel: getSpecularMIPLevel
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};
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} )();
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SpecularMIPLevelNode.prototype.nodeType = 'SpecularMIPLevel';
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export { SpecularMIPLevelNode };
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