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98 lines
2.4 KiB
JavaScript
98 lines
2.4 KiB
JavaScript
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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function SpecularMIPLevelNode( roughness, texture ) {
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TempNode.call( this, '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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SpecularMIPLevelNode.Nodes = ( function () {
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var getSpecularMIPLevel = new FunctionNode( [
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// taken from here: http://casual-effects.blogspot.ca/2011/08/plausible-environment-lighting-in-two.html
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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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// clamp to allowable LOD ranges.
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' return clamp( desiredMIPLevel, 0.0, maxMIPLevelScalar );',
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'}'
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].join( '\n' ) );
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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 = Object.create( TempNode.prototype );
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SpecularMIPLevelNode.prototype.constructor = SpecularMIPLevelNode;
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SpecularMIPLevelNode.prototype.nodeType = 'SpecularMIPLevel';
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SpecularMIPLevelNode.prototype.setTexture = function ( texture ) {
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this.texture = texture;
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return this;
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};
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SpecularMIPLevelNode.prototype.generate = function ( 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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var 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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SpecularMIPLevelNode.prototype.copy = function ( source ) {
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TempNode.prototype.copy.call( this, 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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SpecularMIPLevelNode.prototype.toJSON = function ( meta ) {
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var 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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export { SpecularMIPLevelNode };
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