Batch buffer update

Improve pipelining: submit buffer updates in order that they will be
rendered before they are rendered to allow for them to complete before
the data is required.

src/renderers/WebGLRenderer.js

@@ -1668,6 +1668,8 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 		}
 
+		objects.update( opaqueObjects );
+		objects.update( transparentObjects );
 		//
 
 		shadowMap.render( scene, camera );

src/renderers/webgl/WebGLObjects.js

@@ -111,7 +111,7 @@ THREE.WebGLObjects = function ( gl, info ) {
 
 	};
 
-	this.update = function ( object ) {
+	var update = function ( object ) {
 
 		var geometry = geometries.get( object );
 
@@ -188,4 +188,18 @@ THREE.WebGLObjects = function ( gl, info ) {
 
 	};
 
+	this.update = function ( renderList ) {
+
+		for ( var i = 0, ul = renderList.length; i < ul; i++ ) {
+
+			var object = renderList[i].object;
+
+			if ( object.material.visible !== false ) {
+
+				update( object );
+
+			}
+		}
+	}
+
 };