(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)
    (let [bg (new FlxSprite 0 0 "assets/images/apTestRoomEdited.jpg")]
        (bg.setGraphicSize (iHalf FlxG.width) (iHalf FlxG.height))
        (bg.screenCenter)
        (set bg.alpha 0.5)
        (add bg))
    (set shader (new kiss_flixel.shaders.Invert))
    (kiss_flixel.CameraTools.addShaderFilter FlxG.camera (array FlxShader shader)))

(method &override :Void update [:Float elapsed]
    (super.update elapsed)

    (when FlxG.keys.justPressed.SPACE
        (set shader.invertBool !shader.invertBool)))