/**
 * Constant values used in pixi
 *
 * @memberof PIXI
 */
module.exports = {
    /**
     * String of the current PIXI version
     *
     * @static
     * @constant
     * @property {string} VERSION
     */
    VERSION: require('../../package.json').version,

    /**
     * @property {number} PI_2 - Two Pi
     * @constant
     * @static
     */
    PI_2: Math.PI * 2,

    /**
     * @property {number} RAD_TO_DEG - Constant conversion factor for converting radians to degrees
     * @constant
     * @static
     */
    RAD_TO_DEG: 180 / Math.PI,

    /**
     * @property {Number} DEG_TO_RAD - Constant conversion factor for converting degrees to radians
     * @constant
     * @static
     */
    DEG_TO_RAD: Math.PI / 180,

    /**
     * Constant to identify the Renderer Type.
     *
     * @static
     * @constant
     * @property {object} RENDERER_TYPE
     * @property {number} RENDERER_TYPE.UNKNOWN
     * @property {number} RENDERER_TYPE.WEBGL
     * @property {number} RENDERER_TYPE.CANVAS
     */
    RENDERER_TYPE: {
        UNKNOWN:    0,
        WEBGL:      1,
        CANVAS:     2
    },

    /**
     * Various blend modes supported by PIXI. IMPORTANT - The WebGL renderer only supports
     * the NORMAL, ADD, MULTIPLY and SCREEN blend modes. Anything else will silently act like
     * NORMAL.
     *
     * @static
     * @constant
     * @property {object} BLEND_MODES
     * @property {number} BLEND_MODES.NORMAL
     * @property {number} BLEND_MODES.ADD
     * @property {number} BLEND_MODES.MULTIPLY
     * @property {number} BLEND_MODES.SCREEN
     * @property {number} BLEND_MODES.OVERLAY
     * @property {number} BLEND_MODES.DARKEN
     * @property {number} BLEND_MODES.LIGHTEN
     * @property {number} BLEND_MODES.COLOR_DODGE
     * @property {number} BLEND_MODES.COLOR_BURN
     * @property {number} BLEND_MODES.HARD_LIGHT
     * @property {number} BLEND_MODES.SOFT_LIGHT
     * @property {number} BLEND_MODES.DIFFERENCE
     * @property {number} BLEND_MODES.EXCLUSION
     * @property {number} BLEND_MODES.HUE
     * @property {number} BLEND_MODES.SATURATION
     * @property {number} BLEND_MODES.COLOR
     * @property {number} BLEND_MODES.LUMINOSITY
     */
    BLEND_MODES: {
        NORMAL:         0,
        ADD:            1,
        MULTIPLY:       2,
        SCREEN:         3,
        OVERLAY:        4,
        DARKEN:         5,
        LIGHTEN:        6,
        COLOR_DODGE:    7,
        COLOR_BURN:     8,
        HARD_LIGHT:     9,
        SOFT_LIGHT:     10,
        DIFFERENCE:     11,
        EXCLUSION:      12,
        HUE:            13,
        SATURATION:     14,
        COLOR:          15,
        LUMINOSITY:     16
    },

    /**
     * The scale modes that are supported by pixi.
     *
     * The DEFAULT scale mode affects the default scaling mode of future operations.
     * It can be re-assigned to either LINEAR or NEAREST, depending upon suitability.
     *
     * @static
     * @constant
     * @property {object} SCALE_MODES
     * @property {number} SCALE_MODES.DEFAULT=LINEAR
     * @property {number} SCALE_MODES.LINEAR Smooth scaling
     * @property {number} SCALE_MODES.NEAREST Pixelating scaling
     */
    SCALE_MODES: {
        DEFAULT:    0,
        LINEAR:     0,
        NEAREST:    1
    },

    /**
     * The prefix that denotes a URL is for a retina asset
     *
     * @static
     * @constant
     * @property {string} RETINA_PREFIX
     */
    //example: '@2x',
    RETINA_PREFIX: /@(.+)x/,

    RESOLUTION:1,

    FILTER_RESOLUTION:1,

    /**
     * The default render options if none are supplied to {@link PIXI.WebGLRenderer}
     * or {@link PIXI.CanvasRenderer}.
     *
     * @static
     * @constant
     * @property {object} DEFAULT_RENDER_OPTIONS
     * @property {HTMLCanvasElement} DEFAULT_RENDER_OPTIONS.view=null
     * @property {boolean} DEFAULT_RENDER_OPTIONS.transparent=false
     * @property {boolean} DEFAULT_RENDER_OPTIONS.antialias=false
     * @property {boolean} DEFAULT_RENDER_OPTIONS.forceFXAA=false
     * @property {boolean} DEFAULT_RENDER_OPTIONS.preserveDrawingBuffer=false
     * @property {number} DEFAULT_RENDER_OPTIONS.resolution=1
     * @property {number} DEFAULT_RENDER_OPTIONS.backgroundColor=0x000000
     * @property {boolean} DEFAULT_RENDER_OPTIONS.clearBeforeRender=true
     * @property {boolean} DEFAULT_RENDER_OPTIONS.autoResize=false
     */
    DEFAULT_RENDER_OPTIONS: {
        view: null,
        resolution: 1,
        antialias: false,
        forceFXAA: false,
        autoResize: false,
        transparent: false,
        backgroundColor: 0x000000,
        clearBeforeRender: true,
        preserveDrawingBuffer: false
    },

    /**
     * Constants that identify shapes, mainly to prevent `instanceof` calls.
     *
     * @static
     * @constant
     * @property {object} SHAPES
     * @property {object} SHAPES.POLY=0
     * @property {object} SHAPES.RECT=1
     * @property {object} SHAPES.CIRC=2
     * @property {object} SHAPES.ELIP=3
     * @property {object} SHAPES.RREC=4
     */
    SHAPES: {
        POLY: 0,
        RECT: 1,
        CIRC: 2,
        ELIP: 3,
        RREC: 4
    },

    SPRITE_BATCH_SIZE: 2000 //nice balance between mobile and desktop machines
};