WebGLPrograms: Clean up.

src/renderers/webgl/WebGLPrograms.js

@@ -142,7 +142,7 @@ function WebGLPrograms( renderer, extensions, capabilities ) {
 
 	}
 
-	this.getParameters = function ( material, lights, shadows, scene, nClipPlanes, nClipIntersection, object ) {
+	function getParameters( material, lights, shadows, scene, nClipPlanes, nClipIntersection, object ) {
 
 		const fog = scene.fog;
 		const environment = material.isMeshStandardMaterial ? scene.environment : null;
@@ -295,9 +295,9 @@ function WebGLPrograms( renderer, extensions, capabilities ) {
 
 		return parameters;
 
-	};
+	}
 
-	this.getProgramCacheKey = function ( parameters ) {
+	function getProgramCacheKey( parameters ) {
 
 		const array = [];
 
@@ -340,9 +340,9 @@ function WebGLPrograms( renderer, extensions, capabilities ) {
 
 		return array.join();
 
-	};
+	}
 
-	this.acquireProgram = function ( parameters, cacheKey ) {
+	function acquireProgram( parameters, cacheKey ) {
 
 		let program;
 
@@ -371,9 +371,9 @@ function WebGLPrograms( renderer, extensions, capabilities ) {
 
 		return program;
 
-	};
+	}
 
-	this.releaseProgram = function ( program ) {
+	function releaseProgram( program ) {
 
 		if ( -- program.usedTimes === 0 ) {
 
@@ -387,10 +387,16 @@ function WebGLPrograms( renderer, extensions, capabilities ) {
 
 		}
 
-	};
+	}
 
-	// Exposed for resource monitoring & error feedback via renderer.info:
-	this.programs = programs;
+	return {
+		getParameters: getParameters,
+		getProgramCacheKey: getProgramCacheKey,
+		acquireProgram: acquireProgram,
+		releaseProgram: releaseProgram,
+		// Exposed for resource monitoring & error feedback via renderer.info:
+		programs: programs
+	};
 
 }