73 lines
1.7 KiB
C++
73 lines
1.7 KiB
C++
///////////////////////////////////////////////////////////////////////////////////////////////////
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// OpenGL Mathematics Copyright (c) 2005 - 2012 G-Truc Creation (www.g-truc.net)
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Created : 2011-10-11
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// Updated : 2011-10-11
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// Licence : This source is under MIT licence
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// File : test/gtx/gtx_integer.cpp
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///////////////////////////////////////////////////////////////////////////////////////////////////
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#include <glm/glm.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: %d, %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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