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76 lines
1.2 KiB
76 lines
1.2 KiB
2 years ago
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import { TempNode } from '../core/TempNode.js';
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import { ConstNode } from '../core/ConstNode.js';
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import { FunctionNode } from '../core/FunctionNode.js';
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class LuminanceNode extends TempNode {
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constructor( rgb ) {
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super( 'f' );
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this.rgb = rgb;
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}
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generate( builder, output ) {
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const luminance = builder.include( LuminanceNode.Nodes.luminance );
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return builder.format( luminance + '( ' + this.rgb.build( builder, 'v3' ) + ' )', this.getType( builder ), output );
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}
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copy( source ) {
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super.copy( source );
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this.rgb = source.rgb;
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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.rgb = this.rgb.toJSON( meta ).uuid;
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}
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return data;
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}
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}
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LuminanceNode.Nodes = ( function () {
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const LUMA = new ConstNode( 'vec3 LUMA vec3( 0.2125, 0.7154, 0.0721 )' );
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// Algorithm from Chapter 10 of Graphics Shaders
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const luminance = new FunctionNode( /* glsl */`
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float luminance( vec3 rgb ) {
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return dot( rgb, LUMA );
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}`
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, [ LUMA ] );
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return {
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LUMA: LUMA,
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luminance: luminance
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};
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} )();
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LuminanceNode.prototype.nodeType = 'Luminance';
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export { LuminanceNode };
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