Comments, and removed reinitialisation of the glBatch list.

Author: pjbaron

src/tilemap/TilemapLayerGL.js

@@ -670,8 +670,6 @@ Phaser.TilemapLayerGL.prototype.setScale = function (xScale, yScale) {
 */
 Phaser.TilemapLayerGL.prototype.renderRegion = function (scrollX, scrollY, left, top, right, bottom) {
 
-    var context = this.context;
-
     var width = this.layer.width;
     var height = this.layer.height;
     var tw = this._mc.tileWidth;
@@ -741,7 +739,6 @@ Phaser.TilemapLayerGL.prototype.renderRegion = function (scrollX, scrollY, left,
                 set = this.resolveTileset(index);
             }
 
-            //  Setting the globalAlpha is "surprisingly expensive" in Chrome (38)
             if (tile.alpha !== lastAlpha && !this.debug)
             {
                 //context.globalAlpha = tile.alpha;

src/tilemap/Tileset.js

@@ -171,11 +171,6 @@ Phaser.Tileset.prototype = {
         if (coordIndex >= 0 && (coordIndex + 1) < this.drawCoords.length)
         {
             // add the tile to the webgl batch
-            if ( !glBatch )
-            {
-                glBatch = [];
-            }
-
             // source and destination coordinates, in pixel units
             // destination is the centre of the tile
             glBatch.push( {