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96 lines
2.7 KiB
C++
96 lines
2.7 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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/// OpenGL Mathematics (glm.g-truc.net)
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///
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/// Copyright (c) 2005 - 2015 G-Truc Creation (www.g-truc.net)
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/// Permission is hereby granted, free of charge, to any person obtaining a copy
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/// of this software and associated documentation files (the "Software"), to deal
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/// in the Software without restriction, including without limitation the rights
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/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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/// copies of the Software, and to permit persons to whom the Software is
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/// furnished to do so, subject to the following conditions:
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///
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/// The above copyright notice and this permission notice shall be included in
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/// all copies or substantial portions of the Software.
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///
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/// Restrictions:
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/// By making use of the Software for military purposes, you choose to make
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/// a Bunny unhappy.
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///
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/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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/// THE SOFTWARE.
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///
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/// @file test/gtx/gtx_integer.cpp
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/// @date 2011-10-11 / 2014-11-25
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/// @author Christophe Riccio
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///////////////////////////////////////////////////////////////////////////////////
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#include <glm/exponential.hpp>
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#include <glm/gtc/epsilon.hpp>
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#include <glm/gtx/integer.hpp>
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#include <cstdio>
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/*
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int test_floor_log2()
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{
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int Error = 0;
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for(std::size_t i = 1; i < 1000000; ++i)
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{
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glm::uint A = glm::floor_log2(glm::uint(i));
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glm::uint B = glm::uint(glm::floor(glm::log2(double(i)))); // Will fail with float, lack of accuracy
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Error += A == B ? 0 : 1;
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assert(!Error);
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}
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return Error;
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}
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*/
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int test_log2()
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{
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int Error = 0;
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for(std::size_t i = 1; i < 24; ++i)
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{
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glm::uint A = glm::log2(glm::uint(1 << i));
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glm::uint B = glm::uint(glm::log2(double(1 << i)));
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//Error += glm::equalEpsilon(double(A), B, 1.0) ? 0 : 1;
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Error += glm::abs(double(A) - B) <= 24 ? 0 : 1;
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assert(!Error);
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printf("Log2(%d) error A=%d, B=%d\n", 1 << i, A, B);
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}
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printf("log2 error=%d\n", Error);
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return Error;
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}
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int test_nlz()
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{
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int Error = 0;
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for(glm::uint i = 1; i < glm::uint(33); ++i)
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Error += glm::nlz(i) == glm::uint(31u) - glm::findMSB(i) ? 0 : 1;
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//printf("%d, %d\n", glm::nlz(i), 31u - glm::findMSB(i));
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return Error;
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}
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int main()
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{
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int Error = 0;
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Error += test_nlz();
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// Error += test_floor_log2();
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Error += test_log2();
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return Error;
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}
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