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143 lines
3.7 KiB
C++
143 lines
3.7 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_float(T const & x);
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#if(GLM_COMPILER & GLM_COMPILER_VC)
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# include <cfloat>
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# define GLM_NEXT_AFTER _nextafterf
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#else
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# include <cmath>
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# define GLM_NEXT_AFTER nextafterf
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#endif
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GLM_FUNC_QUALIFIER float next_float(float const & x)
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{
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return GLM_NEXT_AFTER(x, std::numeric_limits<float>::max());
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}
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GLM_FUNC_QUALIFIER double next_float(double const & x)
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{
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return GLM_NEXT_AFTER(x, std::numeric_limits<double>::max());
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}
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GLM_FUNC_QUALIFIER float prev_float(float const & x)
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{
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return GLM_NEXT_AFTER(x, std::numeric_limits<float>::min());
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}
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GLM_FUNC_QUALIFIER double prev_float(double const & x)
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{
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return GLM_NEXT_AFTER(x, std::numeric_limits<double>::min());
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}
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template <typename T>
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GLM_FUNC_QUALIFIER T next_float(T const & x, std::size_t const & ulps)
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{
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T temp = x;
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for(std::size_t i = 0; i < ulps; ++i)
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temp = next_float(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 T prev_float(T const & x, std::size_t const & ulps)
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{
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T temp = x;
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for(std::size_t i = 0; i < ulps; ++i)
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temp = prev_float(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 float_distance(T const & x, T const & y)
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{
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std::size_t ulp = 0;
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if(x < y)
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{
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T temp = x;
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while(temp != y && ulp < std::numeric_limits<std::size_t>::max())
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{
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++ulp;
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temp = next_float(temp);
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}
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}
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else if(y < x)
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{
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T temp = y;
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while(temp != x && ulp < std::numeric_limits<std::size_t>::max())
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{
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++ulp;
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temp = next_float(temp);
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}
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}
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else // ==
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{
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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_float(W);
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double Y = 1.0;
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double Z = next_float(Y);
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bool TestX = W != X;
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bool TestZ = Y != Z;
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std::cout << "1.0f, Next: " << float_distance(W, X)<< std::endl;
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std::cout << "1.0f, Next(1000): " << float_distance(W, next_float(W, 1000)) << std::endl;
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std::cout << "1.0f, Next: " << float_distance(X, W)<< std::endl;
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std::cout << "1.0f, Next(1000): " << float_distance(next_float(W, 1000), W) << std::endl;
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std::cout << "1.0, Next: " << float_distance(Y, Z) << std::endl;
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std::cout << "1.0, Next(1000): " << float_distance(next_float(Y, 1000), Y) << std::endl;
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std::cout << Z << " 0.01, 0.011" << std::endl;
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std::cout << " 1.0, Next(1000000): " << next_float(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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