libcruft-util/test/coord.cpp

#include "tap.hpp"
#include "point.hpp"
#include "vector.hpp"

#include "coord/iostream.hpp"
#include "coord/comparator.hpp"

#include <type_traits>


int
main (void)
{
    static_assert (std::is_trivially_copyable_v<cruft::point2i>);

    static_assert (cruft::has_result_v<cruft::point3f, cruft::vector3f>);

    static_assert (sizeof (cruft::point1u) == 1 * sizeof (cruft::point1u::value_type), "point1u is not packed");
    static_assert (sizeof (cruft::point2u) == 2 * sizeof (cruft::point2u::value_type), "point2u is not packed");
    static_assert (sizeof (cruft::point3u) == 3 * sizeof (cruft::point3u::value_type), "point3u is not packed");
    static_assert (sizeof (cruft::point4u) == 4 * sizeof (cruft::point4u::value_type), "point4u is not packed");

    static_assert (sizeof (cruft::point1f) == 1 * sizeof (cruft::point1f::value_type), "point1f is not packed");
    static_assert (sizeof (cruft::point2f) == 2 * sizeof (cruft::point2f::value_type), "point2f is not packed");
    static_assert (sizeof (cruft::point3f) == 3 * sizeof (cruft::point3f::value_type), "point3f is not packed");
    static_assert (sizeof (cruft::point4f) == 4 * sizeof (cruft::point4f::value_type), "point4f is not packed");

    cruft::TAP::logger tap;

    constexpr cruft::point2i p { -1,  2 };

    tap.expect_eq (-p, cruft::point2i { 1, -2 }, "unary point negation");
    tap.expect_eq ( p, p, "unary point addition");

    auto vec = cruft::vector4f (0.5f);
    tap.expect (cruft::almost_equal (vec, cruft::normalised (vec)), "normalisation of normalised vector");

    tap.expect_eq (sum (cruft::vector4f::ones ()), 4.f, "elementwise summation");

    // check that structured bindings work
    {
        const auto &[x,y] = p;
        tap.expect (x == p.x && y == p.y, "structured bindings extract correct data");
    }

    // check that we can assign to arrays from coord types
    {
        std::array<int,2> q = p;
        tap.expect (
            std::equal (std::begin (q), std::end (q), std::begin (p)),
            "assignment to array preserves values"
        );
    }

    // ensure the distance function behaves correctly with non-normal numbers.
    {
        cruft::point3f a { 103, 0, 14 };
        cruft::point3f b { 104, INFINITY, 15 };

        tap.expect_eq (
            std::numeric_limits<float>::infinity (),
            ::cruft::distance (a, b),
            "distance with an infinity is infinite"
        );
    }

    // test expected outputs for various vector-logical operations
    {
        constexpr cruft::point3i a {  0, -1,  2 };
        constexpr cruft::point3i b {  0,  1, -2 };
        constexpr cruft::point3i c { -9, -9, -9 };

        tap.expect (!all (a <= b), "all, expected failure");
        tap.expect ( all (a <= a), "all, expected success");
        tap.expect (!any (a <= c), "any, expected failure");
        tap.expect ( any (a <= b), "any, expected success");
    };

    // ensure the cruft::select function behaves as expected
    {
        const cruft::point3f a { -1, 2, 0 };
        const cruft::point3f b {  1, 0, 2 };

        const cruft::point3f lo { -1, 0, 0 };
        const cruft::point3f hi {  1, 2, 2 };

        tap.expect_eq (select (a < b, a, b), lo, "select with points and min");
        tap.expect_eq (select (a > b, a, b), hi, "select with points and max");
    };

    // ensure that cruft::clamp resolves to the coord overload. the exact
    // values are less useful than exercising the compiler/linker.
    {
        const cruft::vector3f val {  0, -1,  2 };
        const cruft::vector3f lo  { -1,  1, -2 };
        const cruft::vector3f hi  {  1,  2,  0 };

        tap.expect_eq (clamp (val,  lo,  hi), cruft::vector3f { 0, 1, 0 }, "clamp with vec/vec/vec");
        tap.expect_eq (clamp (val, 0.f,  hi), cruft::vector3f { 0, 0, 0 }, "clamp with vec/num/vec");
        tap.expect_eq (clamp (val,  lo, 2.f), cruft::vector3f { 0, 1, 2 }, "clamp with vec/vec/num");
        tap.expect_eq (clamp (val, 0.f, 2.f), cruft::vector3f { 0, 0, 2 }, "clamp with vec/num/num");
    }

    // ensure that klass::indices appears to link correctly
    {
        const cruft::vector3i seq { 0, 1, 2 };

        {
            const cruft::vector4i res { 2, 0, 0, 1 };
            tap.expect_eq (seq.indices<2,0,0,1> (), res, "coord::indices expansion");
        }

        {
            const cruft::vector4i res { 2, 3, 4, 0 };
            tap.expect_eq (seq.indices<2,3,4,0> (3, 4), res, "coord::indices supplemental expansion");
        }
    };

    // ensure that cruft::shift operations appear to operate correctly
    {
        const cruft::vector3i seq { 0, 1, 2 };
        tap.expect_eq (rshift (seq, 1, 0), cruft::make_vector (0, 0, 1), "rshift, scalar fill");

        tap.expect_eq (
            rshift (seq, 2, cruft::make_vector (3, 4, 5 )),
            cruft::make_vector (3, 4, 0),
            "rshift, coord fill"
        );
    }

    {
        struct {
            cruft::point2i a;
            cruft::point2i b;
            std::weak_ordering expected;
            char const *message;
        } const TESTS[] {
            { { 0, 0 }, { 0, 0 }, std::weak_ordering::equivalent, "equal zeroes" },
            { { 1, 0 }, { 0, 0 }, std::weak_ordering::greater,    "a, leading high" },
            { { 0, 1 }, { 0, 0 }, std::weak_ordering::greater,    "a, trailing high" },
            { { 0, 0 }, { 1, 0 }, std::weak_ordering::less,       "b, leading high" },
            { { 0, 0 }, { 0, 1 }, std::weak_ordering::less,       "b, trailing high" },
        };

        for (auto const &t: TESTS)
            tap.expect (cruft::coord::element_ordering (t.a, t.b) == t.expected, "ordering; {}", t.message);
    }

    return tap.status ();
}