const BLEND = 0;
const OFFSET = 1;
const CULLING = 2;
const DEPTH_TEST = 3;
const WINDING = 4;

export default class State
{
    constructor()
    {
        this.data = 0;

        this.blendMode = 0;
        this.polygonOffset = 0;
    }

    set blend(value)
    {
        if (!!(this.data & (1 << BLEND)) !== value)
        {
            this.data ^= (1 << BLEND);
        }
    }

    get blend()
    {
        return !!(this.data & (1 << BLEND));
    }

    set offsets(value)
    {
        if (!!(this.data & (1 << OFFSET)) !== value)
        {
            this.data ^= (1 << OFFSET);
        }
    }

    get offsets()
    {
        return !!(this.data & (1 << OFFSET));
    }

    set culling(value)
    {
        if (!!(this.data & (1 << CULLING)) !== value)
        {
            this.data ^= (1 << CULLING);
        }
    }

    get culling()
    {
        return !!(this.data & (1 << CULLING));
    }

    set depthTest(value)
    {
        if (!!(this.data & (1 << DEPTH_TEST)) !== value)
        {
            this.data ^= (1 << DEPTH_TEST);
        }
    }

    get depthTest()
    {
        return !!(this.data & (1 << DEPTH_TEST));
    }

    set clockwiseFrontFace(value)
    {
        if (!!(this.data & (1 << WINDING)) !== value)
        {
            this.data ^= (1 << WINDING);
        }
    }

    get clockwiseFrontFace()
    {
        return !!(this.data & (1 << WINDING));
    }

    set blendMode(value)
    {
        // 17 is NO BLEND
        this.blend = (value === 17);
        this._blendMode = value;
    }

    get blendMode()
    {
        return this._blendMode;
    }

    set polygonOffset(value)
    {
        this.offsets = !!value;
        this._polygonOffset = value;
    }

    get polygonOffset()
    {
        return this._polygonOffset;
    }

    set cullFace(value)
    {
        this.culling = !!value;
        this._cullFace = value;
    }

    get cullFace()
    {
        return this._cullFace;
    }

}