xref: /external/chromium-trace/trace-viewer/third_party/gl-matrix/spec/gl-matrix/vec3-spec.js

/* Copyright (c) 2013, Brandon Jones, Colin MacKenzie IV. All rights reserved.

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are permitted provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright notice, this
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describe("vec3", function() {
    var out, vecA, vecB, result;

    beforeEach(function() { vecA = [1, 2, 3]; vecB = [4, 5, 6]; out = [0, 0, 0]; });

    describe("create", function() {
        beforeEach(function() { result = vec3.create(); });
        it("should return a 3 element array initialized to 0s", function() { expect(result).toBeEqualish([0, 0, 0]); });
    });

    describe("clone", function() {
        beforeEach(function() { result = vec3.clone(vecA); });
        it("should return a 3 element array initialized to the values in vecA", function() { expect(result).toBeEqualish(vecA); });
    });

    describe("fromValues", function() {
        beforeEach(function() { result = vec3.fromValues(1, 2, 3); });
        it("should return a 3 element array initialized to the values passed", function() { expect(result).toBeEqualish([1, 2, 3]); });
    });

    describe("copy", function() {
        beforeEach(function() { result = vec3.copy(out, vecA); });
        it("should place values into out", function() { expect(out).toBeEqualish([1, 2, 3]); });
        it("should return out", function() { expect(result).toBe(out); });
    });

    describe("set", function() {
        beforeEach(function() { result = vec3.set(out, 1, 2, 3); });
        it("should place values into out", function() { expect(out).toBeEqualish([1, 2, 3]); });
        it("should return out", function() { expect(result).toBe(out); });
    });

    describe("add", function() {
        describe("with a separate output vector", function() {
            beforeEach(function() { result = vec3.add(out, vecA, vecB); });

            it("should place values into out", function() { expect(out).toBeEqualish([5, 7, 9]); });
            it("should return out", function() { expect(result).toBe(out); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 2, 3]); });
            it("should not modify vecB", function() { expect(vecB).toBeEqualish([4, 5, 6]); });
        });

        describe("when vecA is the output vector", function() {
            beforeEach(function() { result = vec3.add(vecA, vecA, vecB); });

            it("should place values into vecA", function() { expect(vecA).toBeEqualish([5, 7, 9]); });
            it("should return vecA", function() { expect(result).toBe(vecA); });
            it("should not modify vecB", function() { expect(vecB).toBeEqualish([4, 5, 6]); });
        });

        describe("when vecB is the output vector", function() {
            beforeEach(function() { result = vec3.add(vecB, vecA, vecB); });

            it("should place values into vecB", function() { expect(vecB).toBeEqualish([5, 7, 9]); });
            it("should return vecB", function() { expect(result).toBe(vecB); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 2, 3]); });
        });
    });

    describe("subtract", function() {
        it("should have an alias called 'sub'", function() { expect(vec3.sub).toEqual(vec3.subtract); });

        describe("with a separate output vector", function() {
            beforeEach(function() { result = vec3.subtract(out, vecA, vecB); });

            it("should place values into out", function() { expect(out).toBeEqualish([-3, -3, -3]); });
            it("should return out", function() { expect(result).toBe(out); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 2, 3]); });
            it("should not modify vecB", function() { expect(vecB).toBeEqualish([4, 5, 6]); });
        });

        describe("when vecA is the output vector", function() {
            beforeEach(function() { result = vec3.subtract(vecA, vecA, vecB); });

            it("should place values into vecA", function() { expect(vecA).toBeEqualish([-3, -3, -3]); });
            it("should return vecA", function() { expect(result).toBe(vecA); });
            it("should not modify vecB", function() { expect(vecB).toBeEqualish([4, 5, 6]); });
        });

        describe("when vecB is the output vector", function() {
            beforeEach(function() { result = vec3.subtract(vecB, vecA, vecB); });

            it("should place values into vecB", function() { expect(vecB).toBeEqualish([-3, -3, -3]); });
            it("should return vecB", function() { expect(result).toBe(vecB); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 2, 3]); });
        });
    });

    describe("multiply", function() {
        it("should have an alias called 'mul'", function() { expect(vec3.mul).toEqual(vec3.multiply); });

        describe("with a separate output vector", function() {
            beforeEach(function() { result = vec3.multiply(out, vecA, vecB); });

            it("should place values into out", function() { expect(out).toBeEqualish([4, 10, 18]); });
            it("should return out", function() { expect(result).toBe(out); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 2, 3]); });
            it("should not modify vecB", function() { expect(vecB).toBeEqualish([4, 5, 6]); });
        });

        describe("when vecA is the output vector", function() {
            beforeEach(function() { result = vec3.multiply(vecA, vecA, vecB); });

            it("should place values into vecA", function() { expect(vecA).toBeEqualish([4, 10, 18]); });
            it("should return vecA", function() { expect(result).toBe(vecA); });
            it("should not modify vecB", function() { expect(vecB).toBeEqualish([4, 5, 6]); });
        });

        describe("when vecB is the output vector", function() {
            beforeEach(function() { result = vec3.multiply(vecB, vecA, vecB); });

            it("should place values into vecB", function() { expect(vecB).toBeEqualish([4, 10, 18]); });
            it("should return vecB", function() { expect(result).toBe(vecB); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 2, 3]); });
        });
    });

    describe("divide", function() {
        it("should have an alias called 'div'", function() { expect(vec3.div).toEqual(vec3.divide); });

        describe("with a separate output vector", function() {
            beforeEach(function() { result = vec3.divide(out, vecA, vecB); });

            it("should place values into out", function() { expect(out).toBeEqualish([0.25, 0.4, 0.5]); });
            it("should return out", function() { expect(result).toBe(out); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 2, 3]); });
            it("should not modify vecB", function() { expect(vecB).toBeEqualish([4, 5, 6]); });
        });

        describe("when vecA is the output vector", function() {
            beforeEach(function() { result = vec3.divide(vecA, vecA, vecB); });

            it("should place values into vecA", function() { expect(vecA).toBeEqualish([0.25, 0.4, 0.5]); });
            it("should return vecA", function() { expect(result).toBe(vecA); });
            it("should not modify vecB", function() { expect(vecB).toBeEqualish([4, 5, 6]); });
        });

        describe("when vecB is the output vector", function() {
            beforeEach(function() { result = vec3.divide(vecB, vecA, vecB); });

            it("should place values into vecB", function() { expect(vecB).toBeEqualish([0.25, 0.4, 0.5]); });
            it("should return vecB", function() { expect(result).toBe(vecB); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 2, 3]); });
        });
    });

    describe("min", function() {
        beforeEach(function() { vecA = [1, 3, 1]; vecB = [3, 1, 3]; });

        describe("with a separate output vector", function() {
            beforeEach(function() { result = vec3.min(out, vecA, vecB); });

            it("should place values into out", function() { expect(out).toBeEqualish([1, 1, 1]); });
            it("should return out", function() { expect(result).toBe(out); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 3, 1]); });
            it("should not modify vecB", function() { expect(vecB).toBeEqualish([3, 1, 3]); });
        });

        describe("when vecA is the output vector", function() {
            beforeEach(function() { result = vec3.min(vecA, vecA, vecB); });

            it("should place values into vecA", function() { expect(vecA).toBeEqualish([1, 1, 1]); });
            it("should return vecA", function() { expect(result).toBe(vecA); });
            it("should not modify vecB", function() { expect(vecB).toBeEqualish([3, 1, 3]); });
        });

        describe("when vecB is the output vector", function() {
            beforeEach(function() { result = vec3.min(vecB, vecA, vecB); });

            it("should place values into vecB", function() { expect(vecB).toBeEqualish([1, 1, 1]); });
            it("should return vecB", function() { expect(result).toBe(vecB); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 3, 1]); });
        });
    });

    describe("max", function() {
        beforeEach(function() { vecA = [1, 3, 1]; vecB = [3, 1, 3]; });

        describe("with a separate output vector", function() {
            beforeEach(function() { result = vec3.max(out, vecA, vecB); });

            it("should place values into out", function() { expect(out).toBeEqualish([3, 3, 3]); });
            it("should return out", function() { expect(result).toBe(out); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 3, 1]); });
            it("should not modify vecB", function() { expect(vecB).toBeEqualish([3, 1, 3]); });
        });

        describe("when vecA is the output vector", function() {
            beforeEach(function() { result = vec3.max(vecA, vecA, vecB); });

            it("should place values into vecA", function() { expect(vecA).toBeEqualish([3, 3, 3]); });
            it("should return vecA", function() { expect(result).toBe(vecA); });
            it("should not modify vecB", function() { expect(vecB).toBeEqualish([3, 1, 3]); });
        });

        describe("when vecB is the output vector", function() {
            beforeEach(function() { result = vec3.max(vecB, vecA, vecB); });

            it("should place values into vecB", function() { expect(vecB).toBeEqualish([3, 3, 3]); });
            it("should return vecB", function() { expect(result).toBe(vecB); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 3, 1]); });
        });
    });

    describe("scale", function() {
        describe("with a separate output vector", function() {
            beforeEach(function() { result = vec3.scale(out, vecA, 2); });

            it("should place values into out", function() { expect(out).toBeEqualish([2, 4, 6]); });
            it("should return out", function() { expect(result).toBe(out); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 2, 3]); });
        });

        describe("when vecA is the output vector", function() {
            beforeEach(function() { result = vec3.scale(vecA, vecA, 2); });

            it("should place values into vecA", function() { expect(vecA).toBeEqualish([2, 4, 6]); });
            it("should return vecA", function() { expect(result).toBe(vecA); });
        });
    });

    describe("distance", function() {
        it("should have an alias called 'dist'", function() { expect(vec3.dist).toEqual(vec3.distance); });

        beforeEach(function() { result = vec3.distance(vecA, vecB); });

        it("should return the distance", function() { expect(result).toBeCloseTo(5.196152); });
    });

    describe("squaredDistance", function() {
        it("should have an alias called 'sqrDist'", function() { expect(vec3.sqrDist).toEqual(vec3.squaredDistance); });

        beforeEach(function() { result = vec3.squaredDistance(vecA, vecB); });

        it("should return the squared distance", function() { expect(result).toEqual(27); });
    });

    describe("length", function() {
        it("should have an alias called 'len'", function() { expect(vec3.len).toEqual(vec3.length); });

        beforeEach(function() { result = vec3.length(vecA); });

        it("should return the length", function() { expect(result).toBeCloseTo(3.741657); });
    });

    describe("squaredLength", function() {
        it("should have an alias called 'sqrLen'", function() { expect(vec3.sqrLen).toEqual(vec3.squaredLength); });

        beforeEach(function() { result = vec3.squaredLength(vecA); });

        it("should return the squared length", function() { expect(result).toEqual(14); });
    });

    describe("negate", function() {
        describe("with a separate output vector", function() {
            beforeEach(function() { result = vec3.negate(out, vecA); });

            it("should place values into out", function() { expect(out).toBeEqualish([-1, -2, -3]); });
            it("should return out", function() { expect(result).toBe(out); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 2, 3]); });
        });

        describe("when vecA is the output vector", function() {
            beforeEach(function() { result = vec3.negate(vecA, vecA); });

            it("should place values into vecA", function() { expect(vecA).toBeEqualish([-1, -2, -3]); });
            it("should return vecA", function() { expect(result).toBe(vecA); });
        });
    });

    describe("normalize", function() {
        beforeEach(function() { vecA = [5, 0, 0]; });

        describe("with a separate output vector", function() {
            beforeEach(function() { result = vec3.normalize(out, vecA); });

            it("should place values into out", function() { expect(out).toBeEqualish([1, 0, 0]); });
            it("should return out", function() { expect(result).toBe(out); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([5, 0, 0]); });
        });

        describe("when vecA is the output vector", function() {
            beforeEach(function() { result = vec3.normalize(vecA, vecA); });

            it("should place values into vecA", function() { expect(vecA).toBeEqualish([1, 0, 0]); });
            it("should return vecA", function() { expect(result).toBe(vecA); });
        });
    });

    describe("dot", function() {
        beforeEach(function() { result = vec3.dot(vecA, vecB); });

        it("should return the dot product", function() { expect(result).toEqual(32); });
        it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 2, 3]); });
        it("should not modify vecB", function() { expect(vecB).toBeEqualish([4, 5, 6]); });
    });

    describe("cross", function() {
        describe("with a separate output vector", function() {
            beforeEach(function() { result = vec3.cross(out, vecA, vecB); });

            it("should place values into out", function() { expect(out).toBeEqualish([-3, 6, -3]); });
            it("should return out", function() { expect(result).toBe(out); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 2, 3]); });
            it("should not modify vecB", function() { expect(vecB).toBeEqualish([4, 5, 6]); });
        });

        describe("when vecA is the output vector", function() {
            beforeEach(function() { result = vec3.cross(vecA, vecA, vecB); });

            it("should place values into vecA", function() { expect(vecA).toBeEqualish([-3, 6, -3]); });
            it("should return vecA", function() { expect(result).toBe(vecA); });
            it("should not modify vecB", function() { expect(vecB).toBeEqualish([4, 5, 6]); });
        });

        describe("when vecB is the output vector", function() {
            beforeEach(function() { result = vec3.cross(vecB, vecA, vecB); });

            it("should place values into vecB", function() { expect(vecB).toBeEqualish([-3, 6, -3]); });
            it("should return vecB", function() { expect(result).toBe(vecB); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 2, 3]); });
        });
    });

    describe("lerp", function() {
        describe("with a separate output vector", function() {
            beforeEach(function() { result = vec3.lerp(out, vecA, vecB, 0.5); });

            it("should place values into out", function() { expect(out).toBeEqualish([2.5, 3.5, 4.5]); });
            it("should return out", function() { expect(result).toBe(out); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 2, 3]); });
            it("should not modify vecB", function() { expect(vecB).toBeEqualish([4, 5, 6]); });
        });

        describe("when vecA is the output vector", function() {
            beforeEach(function() { result = vec3.lerp(vecA, vecA, vecB, 0.5); });

            it("should place values into vecA", function() { expect(vecA).toBeEqualish([2.5, 3.5, 4.5]); });
            it("should return vecA", function() { expect(result).toBe(vecA); });
            it("should not modify vecB", function() { expect(vecB).toBeEqualish([4, 5, 6]); });
        });

        describe("when vecB is the output vector", function() {
            beforeEach(function() { result = vec3.lerp(vecB, vecA, vecB, 0.5); });

            it("should place values into vecB", function() { expect(vecB).toBeEqualish([2.5, 3.5, 4.5]); });
            it("should return vecB", function() { expect(result).toBe(vecB); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 2, 3]); });
        });
    });

    describe("forEach", function() {
        var vecArray;

        beforeEach(function() {
            vecArray = [
                1, 2, 3,
                4, 5, 6,
                0, 0, 0
            ];
        });

        describe("when performing operations that take no extra arguments", function() {
            beforeEach(function() { result = vec3.forEach(vecArray, 0, 0, 0, vec3.normalize); });

            it("should update all values", function() {
                expect(vecArray).toBeEqualish([
                    0.267261, 0.534522, 0.801783,
                    0.455842, 0.569802, 0.683763,
                    0, 0, 0
                ]);
            });
            it("should return vecArray", function() { expect(result).toBe(vecArray); });
        });

        describe("when performing operations that takes one extra arguments", function() {
            beforeEach(function() { result = vec3.forEach(vecArray, 0, 0, 0, vec3.add, vecA); });

            it("should update all values", function() {
                expect(vecArray).toBeEqualish([
                    2, 4, 6,
                    5, 7, 9,
                    1, 2, 3
                ]);
            });
            it("should return vecArray", function() { expect(result).toBe(vecArray); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 2, 3]); });
        });

        describe("when specifying an offset", function() {
            beforeEach(function() { result = vec3.forEach(vecArray, 0, 3, 0, vec3.add, vecA); });

            it("should update all values except the first vector", function() {
                expect(vecArray).toBeEqualish([
                    1, 2, 3,
                    5, 7, 9,
                    1, 2, 3
                ]);
            });
            it("should return vecArray", function() { expect(result).toBe(vecArray); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 2, 3]); });
        });

        describe("when specifying a count", function() {
            beforeEach(function() { result = vec3.forEach(vecArray, 0, 0, 2, vec3.add, vecA); });

            it("should update all values except the last vector", function() {
                expect(vecArray).toBeEqualish([
                    2, 4, 6,
                    5, 7, 9,
                    0, 0, 0
                ]);
            });
            it("should return vecArray", function() { expect(result).toBe(vecArray); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 2, 3]); });
        });

        describe("when specifying a stride", function() {
            beforeEach(function() { result = vec3.forEach(vecArray, 6, 0, 0, vec3.add, vecA); });

            it("should update all values except the second vector", function() {
                expect(vecArray).toBeEqualish([
                    2, 4, 6,
                    4, 5, 6,
                    1, 2, 3
                ]);
            });
            it("should return vecArray", function() { expect(result).toBe(vecArray); });
            it("should not modify vecA", function() { expect(vecA).toBeEqualish([1, 2, 3]); });
        });

        describe("when calling a function that does not modify the out variable", function() {
            beforeEach(function() {
                result = vec3.forEach(vecArray, 0, 0, 0, function(out, vec) {});
            });

            it("values should remain unchanged", function() {
                expect(vecArray).toBeEqualish([
                    1, 2, 3,
                    4, 5, 6,
                    0, 0, 0
                ]);
            });
            it("should return vecArray", function() { expect(result).toBe(vecArray); });
        });
    });

    describe("str", function() {
        beforeEach(function() { result = vec3.str(vecA); });

        it("should return a string representation of the vector", function() { expect(result).toEqual("vec3(1, 2, 3)"); });
    });
});