WebGLRenderer: Instancing code clean up.

src/renderers/WebGLRenderer.js

@@ -900,13 +900,9 @@ function WebGLRenderer( parameters ) {
 
 	function setupVertexAttributes( material, program, geometry, startIndex ) {
 
-		var extension;
-
 		if ( geometry && geometry.isInstancedBufferGeometry ) {
 
-			extension = extensions.get( 'ANGLE_instanced_arrays' );
-
-			if ( extension === null ) {
+			if ( extensions.get( 'ANGLE_instanced_arrays' ) === null ) {
 
 				console.error( 'THREE.WebGLRenderer.setupVertexAttributes: using THREE.InstancedBufferGeometry but hardware does not support extension ANGLE_instanced_arrays.' );
 				return;
@@ -952,7 +948,7 @@ function WebGLRenderer( parameters ) {
 
 						if ( data && data.isInstancedInterleavedBuffer ) {
 
-							state.enableAttributeAndDivisor( programAttribute, data.meshPerAttribute, extension );
+							state.enableAttributeAndDivisor( programAttribute, data.meshPerAttribute );
 
 							if ( geometry.maxInstancedCount === undefined ) {
 
@@ -973,7 +969,7 @@ function WebGLRenderer( parameters ) {
 
 						if ( geometryAttribute.isInstancedBufferAttribute ) {
 
-							state.enableAttributeAndDivisor( programAttribute, geometryAttribute.meshPerAttribute, extension );
+							state.enableAttributeAndDivisor( programAttribute, geometryAttribute.meshPerAttribute );
 
 							if ( geometry.maxInstancedCount === undefined ) {
 

src/renderers/webgl/WebGLState.js

@@ -426,7 +426,7 @@ function WebGLState( gl, extensions, paramThreeToGL ) {
 
 	}
 
-	function enableAttributeAndDivisor( attribute, meshPerAttribute, extension ) {
+	function enableAttributeAndDivisor( attribute, meshPerAttribute ) {
 
 		newAttributes[ attribute ] = 1;
 
@@ -439,6 +439,8 @@ function WebGLState( gl, extensions, paramThreeToGL ) {
 
 		if ( attributeDivisors[ attribute ] !== meshPerAttribute ) {
 
+			var extension = extensions.get( 'ANGLE_instanced_arrays' );
+
 			extension.vertexAttribDivisorANGLE( attribute, meshPerAttribute );
 			attributeDivisors[ attribute ] = meshPerAttribute;