Rename updateCounter to version. Add api doc.

docs/api/core/BufferAttribute.html

@@ -43,10 +43,14 @@
 		Flag to indicate that this attribute has changed and should be re-send to the GPU. Set this to true when you modify the value of the array.
 		</div>
 
+		<h3>[property:Integer version]</h3>
+		<div>
+		A version number, incremented every time the needsUpdate property is set to true.
+		</div>
 
 
 		<h2>Methods</h2>
-		
+
 		<h3>[method:null copyAt] ( [page:Integer index1], attribute, [page:Integer index2] ) </h3>
 		<div>
 		Copies itemSize values in the array from the vertex at index2 to the vertex at index1.

src/core/BufferAttribute.js

@@ -9,7 +9,7 @@ THREE.BufferAttribute = function ( array, itemSize ) {
 	this.array = array;
 	this.itemSize = itemSize;
 
-	this.updateCounter = 0;
+	this.version = 0;
 
 };
 
@@ -32,7 +32,7 @@ THREE.BufferAttribute.prototype = {
 
 	set needsUpdate( value ) {
 
-		if ( value === true ) this.updateCounter ++;
+		if ( value === true ) this.version ++;
 
 	},
 

src/core/InterleavedBuffer.js

@@ -9,7 +9,7 @@ THREE.InterleavedBuffer = function ( array, stride, dynamic ) {
 	this.array = array;
 	this.stride = stride;
 
-	this.updateCounter = 0;
+	this.version = 0;
 
 	this.dynamic = dynamic || false;
 	this.updateRange = { offset: 0, count: -1 };
@@ -34,7 +34,7 @@ THREE.InterleavedBuffer.prototype = {
 
 	set needsUpdate( value ) {
 
-		if ( value === true ) this.updateCounter ++;
+		if ( value === true ) this.version ++;
 
 	},
 

src/renderers/webgl/WebGLObjects.js

@@ -185,7 +185,7 @@ THREE.WebGLObjects = function ( gl, properties, info ) {
 
 			createBuffer( attributeProperties, data, bufferType );
 
-		} else if ( attributeProperties.updateCounter !== data.updateCounter ) {
+		} else if ( attributeProperties.version !== data.version ) {
 
 			updateBuffer( attributeProperties, data, bufferType );
 
@@ -210,8 +210,7 @@ THREE.WebGLObjects = function ( gl, properties, info ) {
 
 		gl.bufferData( bufferType, data.array, usage );
 
-		attributeProperties.updateCounter = data.updateCounter;
-		data.needsUpdate = false;
+		attributeProperties.version = data.version;
 
 	}
 
@@ -236,8 +235,7 @@ THREE.WebGLObjects = function ( gl, properties, info ) {
 
 		}
 
-		attributeProperties.updateCounter = data.updateCounter;
-		data.needsUpdate = false;
+		attributeProperties.version = data.version;
 
 	}