core/test/modules/MathTests.cpp

module Tests;

import Core.Math;
import Core.Test;

constexpr float eps = 0.0001f;

static void testInterpolate() {
    Core::testFloat(7.5f, Core::interpolate(5.0f, 10.0f, 0.5f), eps);
    Core::testFloat(-2.0, Core::interpolate(-10.0f, 10.0f, 0.4f), eps);
    Core::testFloat(10.0f, Core::interpolate(-3.0f, 10.0f, 1.0f), eps);
    Core::testFloat(7.0f, Core::interpolate(7.0f, 10.0f, 0.0f), eps);
    Core::testFloat(6.0f, Core::interpolate(0.0f, 10.0f, 0.6f), eps);
}

static void testIsPowerOf2() {
    Core::testTrue(Core::isPowerOf2(1));
    Core::testTrue(Core::isPowerOf2(2));
    Core::testFalse(Core::isPowerOf2(3));
    Core::testTrue(Core::isPowerOf2(4));
    Core::testFalse(Core::isPowerOf2(5));
    Core::testFalse(Core::isPowerOf2(6));
    Core::testFalse(Core::isPowerOf2(7));
    Core::testTrue(Core::isPowerOf2(8));
    Core::testFalse(Core::isPowerOf2(9));
    Core::testFalse(Core::isPowerOf2(10));
    for(int i = 16; i < 30'000; i *= 2) {
        Core::testTrue(Core::isPowerOf2(i));
        Core::testFalse(Core::isPowerOf2(i + 1));
        Core::testFalse(Core::isPowerOf2(i + 2));
        Core::testFalse(Core::isPowerOf2(i + 3));
    }
}

static void testRoundUpLog2() {
    Core::test(0, Core::roundUpLog2(-5));
    Core::test(0, Core::roundUpLog2(0));
    Core::test(1, Core::roundUpLog2(1));
    Core::test(1, Core::roundUpLog2(2));
    Core::test(2, Core::roundUpLog2(3));
    Core::test(2, Core::roundUpLog2(4));
    Core::test(3, Core::roundUpLog2(5));
    Core::test(4, Core::roundUpLog2(10));
    Core::test(5, Core::roundUpLog2(20));
    Core::test(16, Core::roundUpLog2(35'345));
    Core::test(31, Core::roundUpLog2(0x7FFF'FFFF));
}

static void testMin() {
    Core::test(-5, Core::min(-5));
    Core::test(-10, Core::min(-5, 4, 3, 2, -10));
    Core::test(4, Core::min(5, 20, 4, 30));
}

static void testMax() {
    Core::test(-5, Core::max(-5));
    Core::test(4, Core::max(-5, 4, 3, 2, -10));
    Core::test(30, Core::max(5, 20, 4, 30));
}

static void testClamp() {
    Core::test(5, Core::clamp(1, 5, 10));
    Core::test(7, Core::clamp(7, 5, 10));
    Core::test(10, Core::clamp(20, 5, 10));
    Core::test(5, Core::clamp(1, 10, 5));
    Core::test(7, Core::clamp(7, 10, 5));
    Core::test(10, Core::clamp(20, 10, 5));
}

static void testRadianToDegree() {
    Core::testFloat(45.0f, Core::radianToDegree(Core::PI * 0.25f), eps);
    Core::testFloat(90.0f, Core::radianToDegree(Core::PI * 0.5f), eps);
    Core::testFloat(180.0f, Core::radianToDegree(Core::PI), eps);
    Core::testFloat(360.0f, Core::radianToDegree(Core::PI * 2.0f), eps);
}

static void testDegreeToRadian() {
    Core::testFloat(Core::PI * 0.25f, Core::degreeToRadian(45.0f), eps);
    Core::testFloat(Core::PI * 0.5f, Core::degreeToRadian(90.0f), eps);
    Core::testFloat(Core::PI, Core::degreeToRadian(180.0f), eps);
    Core::testFloat(Core::PI * 2.0f, Core::degreeToRadian(360.0f), eps);
}

void testMath() {
    testInterpolate();
    testIsPowerOf2();
    testRoundUpLog2();
    testMin();
    testMax();
    testClamp();
    testRadianToDegree();
    testDegreeToRadian();
}