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89 lines
3.0 KiB
C++
89 lines
3.0 KiB
C++
///////////////////////////////////////////////////////////////////////////////////////////////////
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// OpenGL Mathematics Copyright (c) 2005 - 2014 G-Truc Creation (www.g-truc.net)
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Created : 2013-10-25
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// Updated : 2013-10-25
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// Licence : This source is under MIT licence
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// File : test/gtx/fast_trigonometry.cpp
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///////////////////////////////////////////////////////////////////////////////////////////////////
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#include <glm/gtc/type_precision.hpp>
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#include <glm/gtx/fast_trigonometry.hpp>
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#include <ctime>
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#include <cstdio>
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namespace fastCos{
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int perf()
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{
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const float begin = -glm::pi<float>();
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const float end = glm::pi<float>();
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float result = 0.f;
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const std::clock_t timestamp1 = std::clock();
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for(float i=begin; i<end; i = nextafterf(i, end))
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result = glm::fastCos(i);
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const std::clock_t timestamp2 = std::clock();
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for(float i=begin; i<end; i = nextafterf(i, end))
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result = glm::cos(i);
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const std::clock_t timestamp3 = std::clock();
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const std::clock_t time_fastCos = timestamp2 - timestamp1;
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const std::clock_t time_cos = timestamp3 - timestamp2;
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std::printf("fastCos Time %d clocks\n", static_cast<unsigned int>(time_fastCos));
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std::printf("cos Time %d clocks\n", static_cast<unsigned int>(time_cos));
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return time_fastCos < time_cos ? 0 : 1;
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}
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}
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namespace fastSin{
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int perf()
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{
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const float begin = -glm::pi<float>();
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const float end = glm::pi<float>();
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float result = 0.f;
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const std::clock_t timestamp1 = std::clock();
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for (float i = begin; i<end; i = nextafterf(i, end))
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result = glm::fastSin(i);
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const std::clock_t timestamp2 = std::clock();
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for (float i = begin; i<end; i = nextafterf(i, end))
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result = glm::sin(i);
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const std::clock_t timestamp3 = std::clock();
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const std::clock_t time_fast = timestamp2 - timestamp1;
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const std::clock_t time_default = timestamp3 - timestamp2;
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std::printf("fastSin Time %d clocks\n", static_cast<unsigned int>(time_fast));
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std::printf("sin Time %d clocks\n", static_cast<unsigned int>(time_default));
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return time_fast < time_default ? 0 : 1;
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}
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}
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namespace fastTan{
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int perf()
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{
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const float begin = -glm::pi<float>();
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const float end = glm::pi<float>();
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float result = 0.f;
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const std::clock_t timestamp1 = std::clock();
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for (float i = begin; i<end; i = nextafterf(i, end))
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result = glm::fastTan(i);
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const std::clock_t timestamp2 = std::clock();
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for (float i = begin; i<end; i = nextafterf(i, end))
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result = glm::tan(i);
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const std::clock_t timestamp3 = std::clock();
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const std::clock_t time_fast = timestamp2 - timestamp1;
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const std::clock_t time_default = timestamp3 - timestamp2;
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std::printf("fastTan Time %d clocks\n", static_cast<unsigned int>(time_fast));
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std::printf("tan Time %d clocks\n", static_cast<unsigned int>(time_default));
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return time_fast < time_default ? 0 : 1;
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}
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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 += ::fastCos::perf();
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Error += ::fastSin::perf();
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Error += ::fastTan::perf();
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return Error;
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}
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