(import flixel.FlxState)
(import flixel.FlxG)
(import flixel.FlxSprite)
(import flixel.util.FlxColor)
(import openfl.filters.BitmapFilter)
(import openfl.filters.ShaderFilter)
(import flixel.system.FlxAssets.FlxShader)

(extends FlxState)

(prop &mut shader null)

(method &override :Void create []
    (super.create)
    (set shader (new kiss_flixel.shaders.CheckerBoard))
    (set shader.data.color1FlxColor FlxColor.WHITE)
    (set shader.data.color2FlxColor FlxColor.BLACK)
    (set shader.checkSizeFloat 64.0)
    (set FlxG.camera.bgColor FlxColor.TRANSPARENT)
    (kiss_flixel.CameraTools.addShaderFilter FlxG.camera (array FlxShader shader)))

(method &override :Void update [:Float elapsed]
    (super.update elapsed)
    (+= FlxG.camera.scroll.x 0.05)
    (+= FlxG.camera.scroll.y 0.05))