Fixed clean up errors and improved comments in Examples/WebGL/Benchmark.html

Author: David

VERSIONS.txt

@@ -36,6 +36,7 @@ OTHER:
 - added a shared createjs.deprecate() method, which wraps old methods and property getter/setters to display
 	a console warning when used.
 - added a DeprecatedMethods unit test
+- fixed minor issues with webgl/benchmark demo
 
 
 Version 0.8.2 [November 26, 2015]

examples/WebGL/Benchmark.html

@@ -168,6 +168,7 @@
 		examples.hideDistractor();
 	}
 
+	// because of the significance of some variables that might change, restart anew when major properties change
 	function init() {
 		if(!isReady) { return; }
 
@@ -176,23 +177,25 @@
 			canvas.parentNode.removeChild(canvas);
 		}
 		if(stage && stage.releaseTexture) {
-			stage.releaseTexture(cjsSprites.spriteSheet._images[0]); // CJS cleanup for multi stage-use
+			// As we're removing the old canvas, we have to clean up, this allows us to use the images on a new canvas.
+			// Each canvas has a new WebGL context (by necessity) and images can't be shared between contexts.
+			stage.releaseTexture(stage);
 		}
 
 		// make new stages and canvases
 		canvas = document.createElement("canvas");
 		canvas.width = CANVAS_WIDTH;
 		canvas.height = CANVAS_HEIGHT;
 		if(guiProps.allowWebGL) {
-			stage = new createjs.StageGL(canvas, {transparent: false, autoPurge: -1});
+			// we know we wont be unloading textures, so turn off the cleanup routine to get maximum speed
+			stage = new createjs.StageGL(canvas, {autoPurge: -1});
 			stage.setClearColor(0x000000);
 		} else {
 			stage = new createjs.Stage(canvas);
 		}
 		container = new createjs.Container();
 		stage.addChild(container);
 
-
 		// insert to DOM
 		outDOM.insertBefore(canvas, document.getElementById("stats"));
 	}