static

static/Magic4/js/three.js-dev/examples/jsm/nodes/effects/LuminanceNode.js

@@ -0,0 +1,73 @@
+import { TempNode } from '../core/TempNode.js';
+import { ConstNode } from '../core/ConstNode.js';
+import { FunctionNode } from '../core/FunctionNode.js';
+
+class LuminanceNode extends TempNode {
+
+	constructor( rgb ) {
+
+		super( 'f' );
+
+		this.rgb = rgb;
+
+	}
+
+	generate( builder, output ) {
+
+		const luminance = builder.include( LuminanceNode.Nodes.luminance );
+
+		return builder.format( luminance + '( ' + this.rgb.build( builder, 'v3' ) + ' )', this.getType( builder ), output );
+
+	}
+
+	copy( source ) {
+
+		super.copy( source );
+
+		this.rgb = source.rgb;
+
+		return this;
+
+	}
+
+	toJSON( meta ) {
+
+		let data = this.getJSONNode( meta );
+
+		if ( ! data ) {
+
+			data = this.createJSONNode( meta );
+
+			data.rgb = this.rgb.toJSON( meta ).uuid;
+
+		}
+
+		return data;
+
+	}
+
+}
+
+LuminanceNode.Nodes = ( function () {
+
+	const LUMA = new ConstNode( 'vec3 LUMA vec3( 0.2125, 0.7154, 0.0721 )' );
+
+	const luminance = new FunctionNode( [
+		// Algorithm from Chapter 10 of Graphics Shaders
+		'float luminance( vec3 rgb ) {',
+
+		'	return dot( rgb, LUMA );',
+
+		'}'
+	].join( '\n' ), [ LUMA ] );
+
+	return {
+		LUMA: LUMA,
+		luminance: luminance
+	};
+
+} )();
+
+LuminanceNode.prototype.nodeType = 'Luminance';
+
+export { LuminanceNode };