Tileset.glTexture is a new property that maps to the WebGL Texture for the Tileset image. It's used internally by the renderer to avoid expensive object look-ups and is set automatically in the Tileset.setImage method.

Author: photonstorm

src/tilemaps/Tileset.js

@@ -128,6 +128,16 @@ var Tileset = new Class({
          */
         this.image = null;
 
+        /**
+         * The gl texture used by the WebGL renderer.
+         *
+         * @name Phaser.Tilemaps.Tileset#glTexture
+         * @type {?WebGLTexture}
+         * @readOnly
+         * @since 3.11.0
+         */
+        this.glTexture = null;
+
         /**
          * The number of tile rows in the the tileset.
          *
@@ -276,6 +286,8 @@ var Tileset = new Class({
     {
         this.image = texture;
 
+        this.glTexture = texture.get().source.glTexture;
+
         this.updateTileData(this.image.source[0].width, this.image.source[0].height);
 
         return this;