WebGLRenderer: Clarified program deallocation.

src/renderers/WebGLRenderer.js

@@ -715,44 +715,34 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 		material.program = undefined;
 
-		// only deallocate GL program if this was the last use of shared program
-		// assumed there is only single copy of any program in the _programs list
-		// (that's how it's constructed)
+		for ( var i = 0, n = _programs.length; i !== n; ++ i ) {
 
-		var i, il, programInfo;
-		var deleteProgram = false;
-
-		for ( i = 0, il = _programs.length; i < il; i ++ ) {
-
-			programInfo = _programs[ i ];
+			var programInfo = _programs[ i ];
 
 			if ( programInfo.program === program ) {
 
-				programInfo.usedTimes --;
-
-				if ( programInfo.usedTimes === 0 ) {
-
-					deleteProgram = true;
-
-				}
+				var newReferenceCount = -- programInfo.usedTimes;
 
-				break;
+				if ( newReferenceCount === 0 ) {
 
-			}
+					// the last meterial that has been using the program let
+					// go of it, so remove it from the (unordered) _programs
+					// set and deallocate the GL resource
 
-		}
+					var newLength = n - 1;
 
-		if ( deleteProgram === true ) {
+					_programs[ i ] = _programs[ newLength ];
+					_programs.pop();
 
-			// avoid using array.splice, instead replace with last and pop
+					_gl.deleteProgram( program );
 
-			_programs[ i ] = _programs[ il - 1 ];
-			_programs.pop();
+					_infoMemory.programs = newLength;
 
+				}
 
-			_gl.deleteProgram( program );
+				break;
 
-			_infoMemory.programs --;
+			}
 
 		}