defineSuite([
        'Core/AttributeCompression',
        'Core/Cartesian2',
        'Core/Cartesian3',
        'Core/Cartesian4',
        'Core/defined',
        'Core/Math'
    ], function(
        AttributeCompression,
        Cartesian2,
        Cartesian3,
        Cartesian4,
        defined,
        CesiumMath) {
    'use strict';

    var negativeUnitZ = new Cartesian3(0.0, 0.0, -1.0);
    it('oct decode(0, 0)', function() {
        var result = new Cartesian3();
        AttributeCompression.octDecode(0, 0, result);
        expect(result).toEqual(negativeUnitZ);
    });

    it('oct encode(0, 0, -1)', function() {
        var result = new Cartesian2();
        AttributeCompression.octEncode(negativeUnitZ, result);
        expect(result).toEqual(new Cartesian2(255, 255));
    });

    it('oct encode(0, 0, 1)', function() {
        var result = new Cartesian2();
        AttributeCompression.octEncode(Cartesian3.UNIT_Z, result);
        expect(result).toEqual(new Cartesian2(128, 128));
    });

    it('oct encode(0, 0, -1) to 4 components', function() {
        var result = new Cartesian4();
        AttributeCompression.octEncodeToCartesian4(negativeUnitZ, result);
        expect(result).toEqual(new Cartesian4(255, 255, 255, 255));
    });

    it('oct encode(0, 0, 1) to 4 components', function() {
        var result = new Cartesian4();
        AttributeCompression.octEncodeToCartesian4(Cartesian3.UNIT_Z, result);
        expect(result).toEqual(new Cartesian4(128, 0, 128, 0));
    });

    it('oct extents are equal', function() {
        var result = new Cartesian3();
        // lower left
        AttributeCompression.octDecode(0, 0, result);
        expect(result).toEqual(negativeUnitZ);
        // lower right
        AttributeCompression.octDecode(255, 0, result);
        expect(result).toEqual(negativeUnitZ);
        // upper right
        AttributeCompression.octDecode(255, 255, result);
        expect(result).toEqual(negativeUnitZ);
        // upper left
        AttributeCompression.octDecode(255, 0, result);
        expect(result).toEqual(negativeUnitZ);
    });

    it('throws oct encode vector undefined', function() {
        var vector;
        var result = new Cartesian3();
        expect(function() {
            AttributeCompression.octEncode(vector, result);
        }).toThrowDeveloperError();
    });

    it('throws oct encode result undefined', function() {
        var result;
        expect(function() {
            AttributeCompression.octEncode(Cartesian3.UNIT_Z, result);
        }).toThrowDeveloperError();
    });

    it('throws oct encode non unit vector', function() {
        var nonUnitLengthVector = new Cartesian3(2.0, 0.0, 0.0);
        var result = new Cartesian2();
        expect(function() {
            AttributeCompression.octEncode(nonUnitLengthVector, result);
        }).toThrowDeveloperError();
    });

    it('throws oct encode zero length vector', function() {
        var result = new Cartesian2();
        expect(function() {
            AttributeCompression.octEncode(Cartesian3.ZERO, result);
        }).toThrowDeveloperError();
    });

    it('throws oct decode result undefined', function() {
        var result;
        expect(function() {
            AttributeCompression.octDecode(0, 0, result);
        }).toThrowDeveloperError();
    });

    it('throws oct decode x out of bounds', function() {
        var result = new Cartesian3();
        expect(function() {
            AttributeCompression.octDecode(256, 0, result);
        }).toThrowDeveloperError();
    });

    it('throws oct decode y out of bounds', function() {
        var result = new Cartesian3();
        expect(function() {
            AttributeCompression.octDecode(0, 256, result);
        }).toThrowDeveloperError();
    });

    it('throws 4-component oct decode out of bounds', function() {
        var result = new Cartesian3();
        expect(function() {
            AttributeCompression.octDecodeFromCartesian4(new Cartesian4(256, 0, 0, 0), result);
        }).toThrowDeveloperError();

        expect(function() {
            AttributeCompression.octDecodeFromCartesian4(new Cartesian4(0, 256, 0, 0), result);
        }).toThrowDeveloperError();

        expect(function() {
            AttributeCompression.octDecodeFromCartesian4(new Cartesian4(0, 0, 256, 0), result);
        }).toThrowDeveloperError();

        expect(function() {
            AttributeCompression.octDecodeFromCartesian4(new Cartesian4(0, 0, 0, 256), result);
        }).toThrowDeveloperError();
    });

    it('oct encoding', function() {
        var epsilon = CesiumMath.EPSILON1;

        var encoded = new Cartesian2();
        var result = new Cartesian3();
        var normal = new Cartesian3(0.0, 0.0, 1.0);
        AttributeCompression.octEncode(normal, encoded);
        expect(AttributeCompression.octDecode(encoded.x, encoded.y, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(0.0, 0.0, -1.0);
        AttributeCompression.octEncode(normal, encoded);
        expect(AttributeCompression.octDecode(encoded.x, encoded.y, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(0.0, 1.0, 0.0);
        AttributeCompression.octEncode(normal, encoded);
        expect(AttributeCompression.octDecode(encoded.x, encoded.y, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(0.0, -1.0, 0.0);
        AttributeCompression.octEncode(normal, encoded);
        expect(AttributeCompression.octDecode(encoded.x, encoded.y, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, 0.0, 0.0);
        AttributeCompression.octEncode(normal, encoded);
        expect(AttributeCompression.octDecode(encoded.x, encoded.y, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, 0.0, 0.0);
        AttributeCompression.octEncode(normal, encoded);
        expect(AttributeCompression.octDecode(encoded.x, encoded.y, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, 1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncode(normal, encoded);
        expect(AttributeCompression.octDecode(encoded.x, encoded.y, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, -1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncode(normal, encoded);
        expect(AttributeCompression.octDecode(encoded.x, encoded.y, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, -1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncode(normal, encoded);
        expect(AttributeCompression.octDecode(encoded.x, encoded.y, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, 1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncode(normal, encoded);
        expect(AttributeCompression.octDecode(encoded.x, encoded.y, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, 1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncode(normal, encoded);
        expect(AttributeCompression.octDecode(encoded.x, encoded.y, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, -1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncode(normal, encoded);
        expect(AttributeCompression.octDecode(encoded.x, encoded.y, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, 1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncode(normal, encoded);
        expect(AttributeCompression.octDecode(encoded.x, encoded.y, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, -1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncode(normal, encoded);
        expect(AttributeCompression.octDecode(encoded.x, encoded.y, result)).toEqualEpsilon(normal, epsilon);
    });

    it('oct encoding high precision', function() {
        var rangeMax = 4294967295;
        var epsilon = CesiumMath.EPSILON8;

        var encoded = new Cartesian2();
        var result = new Cartesian3();
        var normal = new Cartesian3(0.0, 0.0, 1.0);
        AttributeCompression.octEncodeInRange(normal, rangeMax, encoded);
        expect(AttributeCompression.octDecodeInRange(encoded.x, encoded.y, rangeMax, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(0.0, 0.0, -1.0);
        AttributeCompression.octEncodeInRange(normal, rangeMax, encoded);
        expect(AttributeCompression.octDecodeInRange(encoded.x, encoded.y, rangeMax, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(0.0, 1.0, 0.0);
        AttributeCompression.octEncodeInRange(normal, rangeMax, encoded);
        expect(AttributeCompression.octDecodeInRange(encoded.x, encoded.y, rangeMax, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(0.0, -1.0, 0.0);
        AttributeCompression.octEncodeInRange(normal, rangeMax, encoded);
        expect(AttributeCompression.octDecodeInRange(encoded.x, encoded.y, rangeMax, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, 0.0, 0.0);
        AttributeCompression.octEncodeInRange(normal, rangeMax, encoded);
        expect(AttributeCompression.octDecodeInRange(encoded.x, encoded.y, rangeMax, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, 0.0, 0.0);
        AttributeCompression.octEncodeInRange(normal, rangeMax, encoded);
        expect(AttributeCompression.octDecodeInRange(encoded.x, encoded.y, rangeMax, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, 1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncodeInRange(normal, rangeMax, encoded);
        expect(AttributeCompression.octDecodeInRange(encoded.x, encoded.y, rangeMax, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, -1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncodeInRange(normal, rangeMax, encoded);
        expect(AttributeCompression.octDecodeInRange(encoded.x, encoded.y, rangeMax, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, -1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncodeInRange(normal, rangeMax, encoded);
        expect(AttributeCompression.octDecodeInRange(encoded.x, encoded.y, rangeMax, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, 1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncodeInRange(normal, rangeMax, encoded);
        expect(AttributeCompression.octDecodeInRange(encoded.x, encoded.y, rangeMax, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, 1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncodeInRange(normal, rangeMax, encoded);
        expect(AttributeCompression.octDecodeInRange(encoded.x, encoded.y, rangeMax, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, -1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncodeInRange(normal, rangeMax, encoded);
        expect(AttributeCompression.octDecodeInRange(encoded.x, encoded.y, rangeMax, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, 1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncodeInRange(normal, rangeMax, encoded);
        expect(AttributeCompression.octDecodeInRange(encoded.x, encoded.y, rangeMax, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, -1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncodeInRange(normal, rangeMax, encoded);
        expect(AttributeCompression.octDecodeInRange(encoded.x, encoded.y, rangeMax, result)).toEqualEpsilon(normal, epsilon);
    });

    it('oct encoding to 4 components', function() {
        var epsilon = CesiumMath.EPSILON1;

        var encoded = new Cartesian4();
        var result = new Cartesian3();
        var normal = new Cartesian3(0.0, 0.0, 1.0);
        AttributeCompression.octEncodeToCartesian4(normal, encoded);
        expect(AttributeCompression.octDecodeFromCartesian4(encoded, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(0.0, 0.0, -1.0);
        AttributeCompression.octEncodeToCartesian4(normal, encoded);
        expect(AttributeCompression.octDecodeFromCartesian4(encoded, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(0.0, 1.0, 0.0);
        AttributeCompression.octEncodeToCartesian4(normal, encoded);
        expect(AttributeCompression.octDecodeFromCartesian4(encoded, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(0.0, -1.0, 0.0);
        AttributeCompression.octEncodeToCartesian4(normal, encoded);
        expect(AttributeCompression.octDecodeFromCartesian4(encoded, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, 0.0, 0.0);
        AttributeCompression.octEncodeToCartesian4(normal, encoded);
        expect(AttributeCompression.octDecodeFromCartesian4(encoded, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, 0.0, 0.0);
        AttributeCompression.octEncodeToCartesian4(normal, encoded);
        expect(AttributeCompression.octDecodeFromCartesian4(encoded, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, 1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncodeToCartesian4(normal, encoded);
        expect(AttributeCompression.octDecodeFromCartesian4(encoded, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, -1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncodeToCartesian4(normal, encoded);
        expect(AttributeCompression.octDecodeFromCartesian4(encoded, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, -1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncodeToCartesian4(normal, encoded);
        expect(AttributeCompression.octDecodeFromCartesian4(encoded, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, 1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncodeToCartesian4(normal, encoded);
        expect(AttributeCompression.octDecodeFromCartesian4(encoded, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, 1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncodeToCartesian4(normal, encoded);
        expect(AttributeCompression.octDecodeFromCartesian4(encoded, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, -1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncodeToCartesian4(normal, encoded);
        expect(AttributeCompression.octDecodeFromCartesian4(encoded, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, 1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncodeToCartesian4(normal, encoded);
        expect(AttributeCompression.octDecodeFromCartesian4(encoded, result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, -1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncodeToCartesian4(normal, encoded);
        expect(AttributeCompression.octDecodeFromCartesian4(encoded, result)).toEqualEpsilon(normal, epsilon);
    });

    it('octFloat encoding', function() {
        var epsilon = CesiumMath.EPSILON1;

        var result = new Cartesian3();
        var normal = new Cartesian3(0.0, 0.0, 1.0);
        expect(AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(0.0, 0.0, -1.0);
        expect(AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(0.0, 1.0, 0.0);
        expect(AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(0.0, -1.0, 0.0);
        expect(AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, 0.0, 0.0);
        expect(AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, 0.0, 0.0);
        expect(AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, 1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        expect(AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, -1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        expect(AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, -1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        expect(AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, 1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        expect(AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, 1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        expect(AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(1.0, -1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        expect(AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, 1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        expect(AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result)).toEqualEpsilon(normal, epsilon);

        normal = new Cartesian3(-1.0, -1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        expect(AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result)).toEqualEpsilon(normal, epsilon);
    });

    it('octFloat encoding is equivalent to oct encoding', function() {
        var encoded = new Cartesian2();
        var result1 = new Cartesian3();
        var result2 = new Cartesian3();

        var normal = new Cartesian3(0.0, 0.0, 1.0);
        AttributeCompression.octEncode(normal, encoded);
        AttributeCompression.octDecode(encoded.x, encoded.y, result1);
        AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result2);
        expect(result1).toEqual(result2);

        normal = new Cartesian3(0.0, 0.0, -1.0);
        AttributeCompression.octEncode(normal, encoded);
        AttributeCompression.octDecode(encoded.x, encoded.y, result1);
        AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result2);
        expect(result1).toEqual(result2);

        normal = new Cartesian3(0.0, 1.0, 0.0);
        AttributeCompression.octEncode(normal, encoded);
        AttributeCompression.octDecode(encoded.x, encoded.y, result1);
        AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result2);
        expect(result1).toEqual(result2);

        normal = new Cartesian3(0.0, -1.0, 0.0);
        AttributeCompression.octEncode(normal, encoded);
        AttributeCompression.octDecode(encoded.x, encoded.y, result1);
        AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result2);
        expect(result1).toEqual(result2);

        normal = new Cartesian3(1.0, 0.0, 0.0);
        AttributeCompression.octEncode(normal, encoded);
        AttributeCompression.octDecode(encoded.x, encoded.y, result1);
        AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result2);
        expect(result1).toEqual(result2);

        normal = new Cartesian3(-1.0, 0.0, 0.0);
        AttributeCompression.octEncode(normal, encoded);
        AttributeCompression.octDecode(encoded.x, encoded.y, result1);
        AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result2);
        expect(result1).toEqual(result2);

        normal = new Cartesian3(1.0, 1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncode(normal, encoded);
        AttributeCompression.octDecode(encoded.x, encoded.y, result1);
        AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result2);
        expect(result1).toEqual(result2);

        normal = new Cartesian3(1.0, -1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncode(normal, encoded);
        AttributeCompression.octDecode(encoded.x, encoded.y, result1);
        AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result2);
        expect(result1).toEqual(result2);

        normal = new Cartesian3(-1.0, -1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncode(normal, encoded);
        AttributeCompression.octDecode(encoded.x, encoded.y, result1);
        AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result2);
        expect(result1).toEqual(result2);

        normal = new Cartesian3(-1.0, 1.0, 1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncode(normal, encoded);
        AttributeCompression.octDecode(encoded.x, encoded.y, result1);
        AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result2);
        expect(result1).toEqual(result2);

        normal = new Cartesian3(1.0, 1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncode(normal, encoded);
        AttributeCompression.octDecode(encoded.x, encoded.y, result1);
        AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result2);
        expect(result1).toEqual(result2);

        normal = new Cartesian3(1.0, -1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncode(normal, encoded);
        AttributeCompression.octDecode(encoded.x, encoded.y, result1);
        AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result2);
        expect(result1).toEqual(result2);

        normal = new Cartesian3(-1.0, 1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncode(normal, encoded);
        AttributeCompression.octDecode(encoded.x, encoded.y, result1);
        AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result2);
        expect(result1).toEqual(result2);

        normal = new Cartesian3(-1.0, -1.0, -1.0);
        Cartesian3.normalize(normal, normal);
        AttributeCompression.octEncode(normal, encoded);
        AttributeCompression.octDecode(encoded.x, encoded.y, result1);
        AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(normal), result2);
        expect(result1).toEqual(result2);
    });

    it('encodeFloat throws without vector', function() {
        expect(function() {
            AttributeCompression.octEncodeFloat(undefined);
        }).toThrowDeveloperError();
    });

    it('decodeFloat throws without value', function() {
        expect(function() {
            AttributeCompression.octDecodeFloat(undefined, new Cartesian3());
        }).toThrowDeveloperError();
    });

    it('decodeFloat throws without result', function() {
        expect(function() {
            AttributeCompression.octDecodeFloat(0.0, undefined);
        }).toThrowDeveloperError();
    });

    it('encode and packFloat is equivalent to oct encoding', function() {
        var vector = new Cartesian3(1.0, 1.0, 1.0);
        Cartesian3.normalize(vector, vector);

        var encoded = AttributeCompression.octEncode(vector, new Cartesian2());
        var encodedFloat = AttributeCompression.octPackFloat(encoded);
        expect(AttributeCompression.octDecodeFloat(encodedFloat, new Cartesian3())).toEqual(AttributeCompression.octDecode(encoded.x, encoded.y, new Cartesian3()));
    });

    it('packFloat throws without encoded', function() {
        expect(function() {
            AttributeCompression.octPackFloat(undefined);
        }).toThrowDeveloperError();
    });

    it('pack is equivalent to oct encoding', function() {
        var x = Cartesian3.UNIT_X;
        var y = Cartesian3.UNIT_Y;
        var z = Cartesian3.UNIT_Z;

        var packed = AttributeCompression.octPack(x, y, z, new Cartesian2());
        var decodedX = new Cartesian3();
        var decodedY = new Cartesian3();
        var decodedZ = new Cartesian3();
        AttributeCompression.octUnpack(packed, decodedX, decodedY, decodedZ);

        expect(decodedX).toEqual(AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(x), new Cartesian3()));
        expect(decodedY).toEqual(AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(y), new Cartesian3()));
        expect(decodedZ).toEqual(AttributeCompression.octDecodeFloat(AttributeCompression.octEncodeFloat(z), new Cartesian3()));
    });

    it('pack throws without v1', function() {
        expect(function() {
            AttributeCompression.octPack(undefined, new Cartesian3(), new Cartesian3(), new Cartesian2());
        }).toThrowDeveloperError();
    });

    it('pack throws without v2', function() {
        expect(function() {
            AttributeCompression.octPack(new Cartesian3(), undefined, new Cartesian3(), new Cartesian2());
        }).toThrowDeveloperError();
    });

    it('pack throws without v3', function() {
        expect(function() {
            AttributeCompression.octPack(new Cartesian3(), new Cartesian3(), undefined, new Cartesian2());
        }).toThrowDeveloperError();
    });

    it('pack throws without result', function() {
        expect(function() {
            AttributeCompression.octPack(new Cartesian3(), new Cartesian3(), new Cartesian3(), undefined);
        }).toThrowDeveloperError();
    });

    it('unpack throws without packed', function() {
        expect(function() {
            AttributeCompression.octUnpack(undefined, new Cartesian3(), new Cartesian3(), new Cartesian3());
        }).toThrowDeveloperError();
    });

    it('unpack throws without v1', function() {
        expect(function() {
            AttributeCompression.octUnpack(new Cartesian2(), undefined, new Cartesian3(), new Cartesian3());
        }).toThrowDeveloperError();
    });

    it('unpack throws without v2', function() {
        expect(function() {
            AttributeCompression.octUnpack(new Cartesian2(), new Cartesian3(), undefined, new Cartesian3());
        }).toThrowDeveloperError();
    });

    it('unpack throws without v3', function() {
        expect(function() {
            AttributeCompression.octUnpack(new Cartesian2(), new Cartesian3(), new Cartesian3(), undefined);
        }).toThrowDeveloperError();
    });

    it('compresses texture coordinates', function() {
        var coords = new Cartesian2(0.5, 0.5);
        expect(AttributeCompression.decompressTextureCoordinates(AttributeCompression.compressTextureCoordinates(coords), new Cartesian2())).toEqualEpsilon(coords, 1.0 / 4096.0);
    });

    it('compress texture coordinates throws without texture coordinates', function() {
        expect(function() {
            AttributeCompression.compressTextureCoordinates(undefined);
        }).toThrowDeveloperError();
    });

    it('decompress texture coordinates throws without encoded texture coordinates', function() {
        expect(function() {
            AttributeCompression.decompressTextureCoordinates(undefined, new Cartesian2());
        }).toThrowDeveloperError();
    });

    it('decompress texture coordinates throws without result', function() {
        expect(function() {
            AttributeCompression.decompressTextureCoordinates(0.0, undefined);
        }).toThrowDeveloperError();
    });

    it('compresses/decompresses 1.0', function() {
        var coords = new Cartesian2(1.0, 1.0);
        expect(AttributeCompression.decompressTextureCoordinates(AttributeCompression.compressTextureCoordinates(coords), new Cartesian2())).toEqual(coords);
    });

    it('compresses/decompresses 0.0', function() {
        var coords = new Cartesian2(1.0, 1.0);
        expect(AttributeCompression.decompressTextureCoordinates(AttributeCompression.compressTextureCoordinates(coords), new Cartesian2())).toEqual(coords);
    });

    it('compresses/decompresses 0.5 / 1.0', function() {
        var coords = new Cartesian2(0.5, 1.0);
        expect(AttributeCompression.decompressTextureCoordinates(AttributeCompression.compressTextureCoordinates(coords), new Cartesian2())).toEqualEpsilon(coords, 1.0 / 4095.0);
    });

    it('compresses/decompresses 1.0 / 0.5', function() {
        var coords = new Cartesian2(1.0, 0.5);
        expect(AttributeCompression.decompressTextureCoordinates(AttributeCompression.compressTextureCoordinates(coords), new Cartesian2())).toEqualEpsilon(coords, 1.0 / 4095.0);
    });

    it('compresses/decompresses values very close but not equal to 1.0', function() {
        var coords = new Cartesian2(0.99999999999999, 0.99999999999999);
        expect(AttributeCompression.decompressTextureCoordinates(AttributeCompression.compressTextureCoordinates(coords), new Cartesian2())).toEqualEpsilon(coords, 1.0 / 4095.0);
    });

    function zigZag(value) {
        return ((value << 1) ^ (value >> 15)) & 0xFFFF;
    }

    var maxShort = 32767;

    function deltaZigZagEncode(uBuffer, vBuffer, heightBuffer) {
        var length = uBuffer.length;
        var buffer = new Uint16Array(length * (defined(heightBuffer) ? 3 : 2));

        var lastU = 0;
        var lastV = 0;
        var lastHeight = 0;

        for (var i = 0; i < length; ++i) {
            var u = uBuffer[i];
            var v = vBuffer[i];

            buffer[i] = zigZag(u - lastU);
            buffer[i + length] = zigZag(v - lastV);

            lastU = u;
            lastV = v;

            if (defined(heightBuffer)) {
                var height = heightBuffer[i];

                buffer[i + length * 2] = zigZag(height - lastHeight);

                lastHeight = height;
            }
        }

        return buffer;
    }

    it('decodes delta and ZigZag encoded vertices without height', function() {
        var length = 10;
        var decodedUBuffer = new Array(length);
        var decodedVBuffer = new Array(length);
        for (var i = 0; i < length; ++i) {
            decodedUBuffer[i] = Math.floor(Math.random() * maxShort);
            decodedVBuffer[i] = Math.floor(Math.random() * maxShort);
        }

        var encoded = deltaZigZagEncode(decodedUBuffer, decodedVBuffer);
        var uBuffer = new Uint16Array(encoded.buffer, 0, length);
        var vBuffer = new Uint16Array(encoded.buffer, length * Uint16Array.BYTES_PER_ELEMENT, length);

        AttributeCompression.zigZagDeltaDecode(uBuffer, vBuffer);

        expect(uBuffer).toEqual(decodedUBuffer);
        expect(vBuffer).toEqual(decodedVBuffer);
    });

    it('decodes delta and ZigZag encoded vertices with height', function() {
        var length = 10;
        var decodedUBuffer = new Array(length);
        var decodedVBuffer = new Array(length);
        var decodedHeightBuffer = new Array(length);
        for (var i = 0; i < length; ++i) {
            decodedUBuffer[i] = Math.floor(Math.random() * maxShort);
            decodedVBuffer[i] = Math.floor(Math.random() * maxShort);
            decodedHeightBuffer[i] = Math.floor(Math.random() * maxShort);
        }

        var encoded = deltaZigZagEncode(decodedUBuffer, decodedVBuffer, decodedHeightBuffer);
        var uBuffer = new Uint16Array(encoded.buffer, 0, length);
        var vBuffer = new Uint16Array(encoded.buffer, length * Uint16Array.BYTES_PER_ELEMENT, length);
        var heightBuffer = new Uint16Array(encoded.buffer, 2 * length * Uint16Array.BYTES_PER_ELEMENT, length);

        AttributeCompression.zigZagDeltaDecode(uBuffer, vBuffer, heightBuffer);

        expect(uBuffer).toEqual(decodedUBuffer);
        expect(vBuffer).toEqual(decodedVBuffer);
        expect(heightBuffer).toEqual(decodedHeightBuffer);
    });

    it('throws when zigZagDeltaDecode has an undefined uBuffer', function() {
        expect(function() {
            AttributeCompression.zigZagDeltaDecode(undefined, new Uint16Array(10));
        }).toThrowDeveloperError();
    });

    it('throws when zigZagDeltaDecode has an undefined vBuffer', function() {
        expect(function() {
            AttributeCompression.zigZagDeltaDecode(new Uint16Array(10), undefined);
        }).toThrowDeveloperError();
    });

    it('throws when zigZagDeltaDecode has unequal uBuffer and vBuffer length', function() {
        expect(function() {
            AttributeCompression.zigZagDeltaDecode(new Uint16Array(10), new Uint16Array(11));
        }).toThrowDeveloperError();
    });

    it('throws when zigZagDeltaDecode has unequal uBuffer, vBuffer, and heightBuffer length', function() {
        expect(function() {
            AttributeCompression.zigZagDeltaDecode(new Uint16Array(10), new Uint16Array(10), new Uint16Array(11));
        }).toThrowDeveloperError();
    });
});