`game.renderer.setTexturePriority` is the method that goes with the Multiple Texture support. It takes an array as its single argument. The array consists of Phaser.Cache image key strings. Phaser will then try to batch as many of the textures as it can, depending on the hardware limits. If for example the GPU can only batch 8 textures, and you provide an array of 16, then only the first 8 in the array will be batched.
Weapon.fire has two new arguments: `offsetX` and `offsetY`. If the bullet is fired from a tracked Sprite or Pointer, or the `from` argument is set, this applies a horizontal and vertical offset from the launch position.
Weapon.fireOffset attempts to fire a single Bullet from a tracked Sprite or Pointer, but applies an offset to the position first. This is a shorter form of calling `Weapon.fire` and passing in the offset arguments.
Weapon.fireMany attempts to fire multiple bullets from the positions defined in the given array. If you provide a `from` argument, or if there is a tracked Sprite or Pointer, then the positions are treated as __offsets__ from the given objects position. If `from` is undefined, and there is no tracked object, then the bullets are fired from the given positions, as they exist in the world.
WebGLRenderer.setTexturePriority is the method used to set the priority of textures when the GPU supports multi-texture batching.
Rope has two new properties `textureIndices` and `textureIndex` to handle multi-texture support.
Strip has two new properties `textureIndices` and `textureIndex` to handle multi-texture support.
The following shaders have all been updated to support multi-textures: `ComplexPrimitiveShader`, `PixiFastShader`, `PixiShader`, `PrimitiveShader`, `StripShader`.
WebGLFastSpriteBatch.vertSize was increased from 10 to 11.
BaseTexture.textureIndex is a new property that controls the index of the texture within the GPU texture cache. Usually you don't change this yourself, and use `renderer.setTexturePriority` instead, but the property is public and available for more advanced use-cases.
CanvasRenderer.setTexturePriority is an empty function, but included to allow you to simply call `game.renderer.setTexturePriority` without first having to wrap that in a WebGL check.
Tilemap.getRayCastTiles now requires a Phaser.TilemapLayer (or Phaser.TilemapLayerGL) as the first argument.
Tilemap.getTiles now requires a Phaser.TilemapLayer (or Phaser.TilemapLayerGL) as the first argument.
Group.getAll will return all children in the Group, or a section of the Group, with the optional ability to test if the child has a property matching the given value or not.
Group.iterate has a new `returnType`: `RETURN_ALL`. This allows you to return all children that pass the iteration test in an array.
Groups have a new method `alignIn`. It allows you to align the Group within another Game Object, or a Rectangle. You can specify one of 9 positions which are the new position constants such as: `Phaser.TOP_LEFT` or `Phaser.CENTER` (see docs for the complete list). The Groups are positioned based on their child bounds, which takes rotation and scaling into consideration. You can easily place Groups into the corners of the screen, or game world, or align them within other Sprites, using this method.
Groups have a new method `alignTo`. It allows you to align a Group to the side of another Game Object, or a Rectangle. You can specify one of 11 positions which are the new position constants such as: `Phaser.TOP_LEFT` or `Phaser.LEFT_BOTTOM` (see docs for the complete list). The Groups are positioned based on their child bounds, which takes rotation and scaling into consideration. You can easily align Groups next to other Sprites using this method.
ArcadePhysics.Body.onOverlap is a new Signal that is dispatched whenever the Body overlaps with another Body. Due to the potentially high volume of signals this could create it is disabled by default. To use this feature set this property to a Phaser.Signal: `sprite.body.onOverlap = new Phaser.Signal()` and it will be called when an overlap happens, passing two arguments: the sprites which collided.
ArcadePhysics.World.separateCircle is a new method that handles all circular body collisions internally within Arcade Physics (thanks @VitaZheltyakov)
All of the Arcade Physics internal methods, such as `collideGroupVsSelf`, `collideSpriteVsSprite` and so on, have been updated to work with circular body shapes (thanks @VitaZheltyakov)
ArcadePhysics.Body.onWorldBounds is a new Signal that is dispatched whenever the Body collides with the world bounds, something that was previously difficult to detect. Due to the potentially high volume of signals this could create it is disabled by default. To use this feature set this property to a Phaser.Signal: `sprite.body.onWorldBounds = new Phaser.Signal()` and it will be called when a collision happens, passing one argument: the sprite on which it occurred.
* The PIXI.BaseTexture.imageUrl property has been removed, as it was never actually populated.
* The PIXI.BaseTexture._UID property has been removed, as it was never actually used internally.
* All references to PIXI.BaseTextureCache have been removed (primarily from BaseTexture.destroy and Texture.destroy), as the BaseTextureCache was never used internally by Phaser, or by our custom version of Pixi.
* PIXI.TextureCache has been removed. It was only ever used by the __default and __missing images that Phaser generates on start-up. It wasn't used internally by Phaser anywhere else, and the only references Pixi has to it have all been removed. If you need it in your own game, please refactor it to avoid it, or re-create the object on the PIXI global object.
* Canvases created by `BaseTexture.fromCanvas` no longer have the `_pixiId` property attached to them, as this was never used internally by Phaser or Pixi.
* PIXI.BaseTexture.updateSourceImage is now deprecated. Please use `Sprite.loadTexture` instead.
* The property PIXI.BaseTextureCacheIdGenerator has been removed, as it is no longer used internally by Phaser or Pixi.
* PIXI.Texture.addTextureToCache has been removed. The PIXI Texture Cache was never actually used by Phaser, and was leading to complications internally.
* PIXI.Texture.removeTextureFromCache has been removed. The PIXI Texture Cache was never actually used by Phaser, and was leading to complications internally.
* PIXI.Texture.fromFrame and PIXI.Sprite.fromFrame have been removed. They relied on the PIXI Texture Cache, which was never actually used by Phaser, and was never used internally by Pixi either.
* The property PIXI.TextureCacheIdGenerator has been removed, as it was not used internally.
* The property PIXI.FrameCache has been removed, as it was not used internally.
Graphics objects enabled for input would fail to do anything if a Phaser Polygon was given to the Graphics object (which it was in nearly all cases), as it wouldn't detect input correctly with flattened polygons (thanks @symbiane #2591)
