three
Version:
JavaScript 3D library
99 lines (57 loc) • 2.42 kB
JavaScript
import { TempNode } from '../core/TempNode.js';
import { FunctionNode } from '../core/FunctionNode.js';
import { MaxMIPLevelNode } from './MaxMIPLevelNode.js';
function SpecularMIPLevelNode( roughness, texture ) {
TempNode.call( this, 'f' );
this.roughness = roughness;
this.texture = texture;
this.maxMIPLevel = undefined;
}
SpecularMIPLevelNode.Nodes = ( function () {
var getSpecularMIPLevel = new FunctionNode( [
// taken from here: http://casual-effects.blogspot.ca/2011/08/plausible-environment-lighting-in-two.html
"float getSpecularMIPLevel( const in float roughness, const in float maxMIPLevelScalar ) {",
" float sigma = PI * roughness * roughness / ( 1.0 + roughness );",
" float desiredMIPLevel = maxMIPLevelScalar + log2( sigma );",
// clamp to allowable LOD ranges.
" return clamp( desiredMIPLevel, 0.0, maxMIPLevelScalar );",
"}"
].join( "\n" ) );
return {
getSpecularMIPLevel: getSpecularMIPLevel
};
} )();
SpecularMIPLevelNode.prototype = Object.create( TempNode.prototype );
SpecularMIPLevelNode.prototype.constructor = SpecularMIPLevelNode;
SpecularMIPLevelNode.prototype.nodeType = "SpecularMIPLevel";
SpecularMIPLevelNode.prototype.setTexture = function ( texture ) {
this.texture = texture;
return this;
};
SpecularMIPLevelNode.prototype.generate = function ( builder, output ) {
if ( builder.isShader( 'fragment' ) ) {
this.maxMIPLevel = this.maxMIPLevel || new MaxMIPLevelNode();
this.maxMIPLevel.texture = this.texture;
var getSpecularMIPLevel = builder.include( SpecularMIPLevelNode.Nodes.getSpecularMIPLevel );
return builder.format( getSpecularMIPLevel + '( ' + this.roughness.build( builder, 'f' ) + ', ' + this.maxMIPLevel.build( builder, 'f' ) + ' )', this.type, output );
} else {
console.warn( "THREE.SpecularMIPLevelNode is not compatible with " + builder.shader + " shader." );
return builder.format( '0.0', this.type, output );
}
};
SpecularMIPLevelNode.prototype.copy = function ( source ) {
TempNode.prototype.copy.call( this, source );
this.texture = source.texture;
this.roughness = source.roughness;
return this;
};
SpecularMIPLevelNode.prototype.toJSON = function ( meta ) {
var data = this.getJSONNode( meta );
if ( ! data ) {
data = this.createJSONNode( meta );
data.texture = this.texture;
data.roughness = this.roughness;
}
return data;
};
export { SpecularMIPLevelNode };