mirror of https://github.com/OpenTTD/OpenTTD.git
98 lines
3.5 KiB
C++
98 lines
3.5 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file math_func.cpp Test functionality from core/math_func. */
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#include "../stdafx.h"
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#include "../3rdparty/catch2/catch.hpp"
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#include "../core/math_func.hpp"
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TEST_CASE("DivideApproxTest - Negative")
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{
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CHECK(-2 == DivideApprox(-5, 2));
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CHECK(2 == DivideApprox(-5, -2));
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CHECK(-1 == DivideApprox(-66, 80));
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}
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TEST_CASE("DivideApproxTest, Divide")
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{
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CHECK(2 == DivideApprox(5, 2));
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CHECK(3 == DivideApprox(80, 30));
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CHECK(3 == DivideApprox(8, 3));
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CHECK(0 == DivideApprox(3, 8));
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}
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TEST_CASE("IntSqrtTest - Zero")
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{
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CHECK(0 == IntSqrt(0));
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}
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TEST_CASE("IntSqrtTest - FindSqRt")
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{
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CHECK(5 == IntSqrt(25));
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CHECK(10 == IntSqrt(100));
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CHECK(9 == IntSqrt(88));
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CHECK(1696 == IntSqrt(2876278));
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}
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TEST_CASE("ClampTo")
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{
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CHECK(0 == ClampTo<uint8_t>(std::numeric_limits<int64_t>::lowest()));
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CHECK(0 == ClampTo<uint8_t>(-1));
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CHECK(0 == ClampTo<uint8_t>(0));
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CHECK(1 == ClampTo<uint8_t>(1));
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CHECK(255 == ClampTo<uint8_t>(std::numeric_limits<uint64_t>::max()));
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CHECK(255 == ClampTo<uint8_t>(256));
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CHECK(255 == ClampTo<uint8_t>(255));
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CHECK(254 == ClampTo<uint8_t>(254));
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CHECK(-128 == ClampTo<int8_t>(std::numeric_limits<int64_t>::lowest()));
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CHECK(-128 == ClampTo<int8_t>(-129));
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CHECK(-128 == ClampTo<int8_t>(-128));
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CHECK(-127 == ClampTo<int8_t>(-127));
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CHECK(127 == ClampTo<int8_t>(std::numeric_limits<uint64_t>::max()));
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CHECK(127 == ClampTo<int8_t>(128));
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CHECK(127 == ClampTo<int8_t>(127));
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CHECK(126 == ClampTo<int8_t>(126));
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CHECK(126 == ClampTo<int64_t>(static_cast<uint8_t>(126)));
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CHECK(126 == ClampTo<uint64_t>(static_cast<int8_t>(126)));
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CHECK(0 == ClampTo<uint64_t>(static_cast<int8_t>(-126)));
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CHECK(0 == ClampTo<uint8_t>(static_cast<int8_t>(-126)));
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/* The realm around 64 bits types is tricky as there is not one type/method that works for all. */
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/* lowest/max uint64_t does not get clamped when clamping to uint64_t. */
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CHECK(std::numeric_limits<uint64_t>::lowest() == ClampTo<uint64_t>(std::numeric_limits<uint64_t>::lowest()));
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CHECK(std::numeric_limits<uint64_t>::max() == ClampTo<uint64_t>(std::numeric_limits<uint64_t>::max()));
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/* negative int64_t get clamped to 0. */
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CHECK(0 == ClampTo<uint64_t>(std::numeric_limits<int64_t>::lowest()));
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CHECK(0 == ClampTo<uint64_t>(int64_t(-1)));
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/* positive int64_t remain the same. */
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CHECK(1 == ClampTo<uint64_t>(int64_t(1)));
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CHECK(static_cast<uint64_t>(std::numeric_limits<int64_t>::max()) == ClampTo<uint64_t>(std::numeric_limits<int64_t>::max()));
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/* max uint64_t gets clamped to max int64_t. */
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CHECK(std::numeric_limits<int64_t>::max() == ClampTo<int64_t>(std::numeric_limits<uint64_t>::max()));
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}
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TEST_CASE("SoftClamp")
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{
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/* Special behaviour of soft clamp returning the average of min/max when min is higher than max. */
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CHECK(1250 == SoftClamp(0, 1500, 1000));
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int million = 1000 * 1000;
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CHECK(1250 * million == SoftClamp(0, 1500 * million, 1000 * million));
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CHECK(0 == SoftClamp(0, 1500 * million, -1500 * million));
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}
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