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105 lines
2.7 KiB
C++
105 lines
2.7 KiB
C++
///////////////////////////////////////////////////////////////////////////////////////////////////
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// OpenGL Mathematics Copyright (c) 2005 - 2011 G-Truc Creation (www.g-truc.net)
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Created : 2011-04-26
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// Updated : 2011-04-26
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// Licence : This source is under MIT licence
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// File : test/gtx/ulp.cpp
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///////////////////////////////////////////////////////////////////////////////////////////////////
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#include <glm/glm.hpp>
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#include <glm/gtx/ulp.hpp>
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#include <iostream>
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#include <limits>
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namespace
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{
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template <typename T>
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T next(T const & x);
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#if(GLM_COMPILER & GLM_COMPILER_VC)
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# include <cfloat>
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GLM_FUNC_QUALIFIER float next(float const & x)
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{
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return _nextafterf(x, std::numeric_limits<float>::max());
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}
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GLM_FUNC_QUALIFIER double next(double const & x)
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{
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return _nextafter(x, std::numeric_limits<double>::max());
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}
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#else
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# include <cmath>
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GLM_FUNC_QUALIFIER float next(float const & x)
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{
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return nextafterf(x, std::numeric_limits<float>::max());
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}
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GLM_FUNC_QUALIFIER double next(double const & x)
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{
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return nextafter(x, std::numeric_limits<double>::max());
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}
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#endif
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template <typename T>
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GLM_FUNC_QUALIFIER T next(T const & x, std::size_t const & Steps)
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{
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T temp = x;
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for(std::size_t i = 0; i < Steps; ++i)
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temp = next(temp);
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return temp;
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}
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template <typename T>
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GLM_FUNC_QUALIFIER std::size_t ulp_distance(T const & x, T const & y)
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{
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std::size_t ulp = 0;
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T temp = x;
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while(temp != y)
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{
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++ulp;
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temp = next(temp);
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}
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return ulp;
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}
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}//namespace
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int test_ulp_float()
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{
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std::cout.precision(std::numeric_limits<double>::digits10 + 1);
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float W = 1.0f;
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float X = next(W);
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bool TestX = W != X;
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std::cout << " 1.0f, Next: " << ulp_distance(W, X)<< std::endl;
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std::cout << " 1.0f, Nextt(1000): " << next(W, 1000)<< std::endl;
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//std::cout << " 0.01, 0.011: " << ulp_distance(0.00000000001f, 0.000000000011f) << std::endl;
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//std::cout << " 0.01, 0.011: " << ulp_distance(0.00000000001, 0.000000000011) << std::endl;
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double Y = 1.0;
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double Z = next(Y);
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bool TestZ = Y != Z;
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std::cout << Z << " 0.01, 0.011" << std::endl;
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std::cout << " 1.0, Next(1000000): " << next(Y, 1000000)<< std::endl;
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std::size_t A = glm::ulp(0.01, 0.02);
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std::size_t B = glm::ulp(glm::vec2(0.01), glm::vec2(0.02));
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std::size_t C = glm::ulp(glm::vec3(0.01), glm::vec3(0.02));
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std::size_t D = glm::ulp(glm::vec4(0.01), glm::vec4(0.02));
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std::cout << "glm::ulp test: " << A << std::endl;
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std::cout << "glm::ulp test: " << B << std::endl;
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std::cout << "glm::ulp test: " << C << std::endl;
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std::cout << "glm::ulp test: " << D << std::endl;
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return 0;
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}
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int main()
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{
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std::cout << "Test 76" << std::endl;
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test_ulp_float();
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}
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