webvr js meetup initial commit

node_modules/three/examples/js/nodes/utils/RoughnessToBlinnExponentNode.js

@@ -0,0 +1,64 @@
+/**
+ * @author sunag / http://www.sunag.com.br/
+ */
+
+THREE.RoughnessToBlinnExponentNode = function() {
+
+	THREE.TempNode.call( this, 'fv1' );
+
+};
+
+THREE.RoughnessToBlinnExponentNode.getSpecularMIPLevel = new THREE.FunctionNode( [
+// taken from here: http://casual-effects.blogspot.ca/2011/08/plausible-environment-lighting-in-two.html
+"float getSpecularMIPLevel( const in float blinnShininessExponent, const in int maxMIPLevel ) {",
+
+	//float envMapWidth = pow( 2.0, maxMIPLevelScalar );
+	//float desiredMIPLevel = log2( envMapWidth * sqrt( 3.0 ) ) - 0.5 * log2( pow2( blinnShininessExponent ) + 1.0 );
+	"float maxMIPLevelScalar = float( maxMIPLevel );",
+	"float desiredMIPLevel = maxMIPLevelScalar - 0.79248 - 0.5 * log2( pow2( blinnShininessExponent ) + 1.0 );",
+
+	// clamp to allowable LOD ranges.
+	"return clamp( desiredMIPLevel, 0.0, maxMIPLevelScalar );",
+"}"
+].join( "\n" ) );
+
+THREE.RoughnessToBlinnExponentNode.prototype = Object.create( THREE.TempNode.prototype );
+THREE.RoughnessToBlinnExponentNode.prototype.constructor = THREE.RoughnessToBlinnExponentNode;
+
+THREE.RoughnessToBlinnExponentNode.prototype.generate = function( builder, output ) {
+
+	var material = builder.material;
+
+	if ( builder.isShader( 'fragment' ) ) {
+
+		if ( material.isDefined( 'PHYSICAL' ) ) {
+
+			builder.include( THREE.RoughnessToBlinnExponentNode.getSpecularMIPLevel );
+
+			if ( builder.isCache( 'clearCoat' ) ) {
+
+				return builder.format( 'getSpecularMIPLevel( Material_ClearCoat_BlinnShininessExponent( material ), 8 )', this.type, output );
+
+			} else {
+				
+				return builder.format( 'getSpecularMIPLevel( Material_BlinnShininessExponent( material ), 8 )', this.type, output );
+				
+			}
+
+		} else {
+
+			console.warn( "THREE.RoughnessToBlinnExponentNode is only compatible with PhysicalMaterial." );
+
+			return builder.format( '0.0', this.type, output );
+
+		}
+
+	} else {
+
+		console.warn( "THREE.RoughnessToBlinnExponentNode is not compatible with " + builder.shader + " shader." );
+
+		return builder.format( '0.0', this.type, output );
+
+	}
+
+};