glm/test/gtc/gtc_random.cpp

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///////////////////////////////////////////////////////////////////////////////////////////////////
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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 : 2011-09-19
// Updated : 2011-09-19
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// Licence : This source is under MIT licence
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// File : test/gtc/random.cpp
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///////////////////////////////////////////////////////////////////////////////////////////////////
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#define GLM_FORCE_RADIANS
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#include <glm/gtc/random.hpp>
#include <glm/gtc/epsilon.hpp>
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#include <iostream>
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#if(GLM_LANG & GLM_LANG_CXX0X_FLAG)
# include <array>
#endif
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int test_linearRand()
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{
int Error = 0;
{
float ResultFloat = 0.0f;
double ResultDouble = 0.0f;
for(std::size_t i = 0; i < 100000; ++i)
{
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ResultFloat += glm::linearRand(-1.0f, 1.0f);
ResultDouble += glm::linearRand(-1.0, 1.0);
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}
Error += glm::epsilonEqual(ResultFloat, 0.0f, 0.0001f);
Error += glm::epsilonEqual(ResultDouble, 0.0, 0.0001);
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assert(!Error);
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}
return Error;
}
int test_circularRand()
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{
int Error = 0;
{
std::size_t Max = 100000;
float ResultFloat = 0.0f;
double ResultDouble = 0.0f;
double Radius = 2.0f;
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for(std::size_t i = 0; i < Max; ++i)
{
ResultFloat += glm::length(glm::circularRand(1.0f));
ResultDouble += glm::length(glm::circularRand(Radius));
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}
Error += glm::epsilonEqual(ResultFloat, float(Max), 0.01f) ? 0 : 1;
Error += glm::epsilonEqual(ResultDouble, double(Max) * double(Radius), 0.01) ? 0 : 1;
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assert(!Error);
}
return Error;
}
int test_sphericalRand()
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{
int Error = 0;
{
std::size_t Max = 100000;
float ResultFloatA = 0.0f;
float ResultFloatB = 0.0f;
float ResultFloatC = 0.0f;
double ResultDoubleA = 0.0f;
double ResultDoubleB = 0.0f;
double ResultDoubleC = 0.0f;
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for(std::size_t i = 0; i < Max; ++i)
{
ResultFloatA += glm::length(glm::sphericalRand(1.0f));
ResultDoubleA += glm::length(glm::sphericalRand(1.0));
ResultFloatB += glm::length(glm::sphericalRand(2.0f));
ResultDoubleB += glm::length(glm::sphericalRand(2.0));
ResultFloatC += glm::length(glm::sphericalRand(3.0f));
ResultDoubleC += glm::length(glm::sphericalRand(3.0));
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}
Error += glm::epsilonEqual(ResultFloatA, float(Max), 0.01f) ? 0 : 1;
Error += glm::epsilonEqual(ResultDoubleA, double(Max), 0.0001) ? 0 : 1;
Error += glm::epsilonEqual(ResultFloatB, float(Max * 2), 0.01f) ? 0 : 1;
Error += glm::epsilonEqual(ResultDoubleB, double(Max * 2), 0.0001) ? 0 : 1;
Error += glm::epsilonEqual(ResultFloatC, float(Max * 3), 0.01f) ? 0 : 1;
Error += glm::epsilonEqual(ResultDoubleC, double(Max * 3), 0.01) ? 0 : 1;
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assert(!Error);
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}
return Error;
}
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int test_diskRand()
{
int Error = 0;
{
float ResultFloat = 0.0f;
double ResultDouble = 0.0f;
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for(std::size_t i = 0; i < 100000; ++i)
{
ResultFloat += glm::length(glm::diskRand(2.0f));
ResultDouble += glm::length(glm::diskRand(2.0));
}
Error += ResultFloat < 200000.f ? 0 : 1;
Error += ResultDouble < 200000.0 ? 0 : 1;
assert(!Error);
}
return Error;
}
int test_ballRand()
{
int Error = 0;
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{
float ResultFloat = 0.0f;
double ResultDouble = 0.0f;
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for(std::size_t i = 0; i < 100000; ++i)
{
ResultFloat += glm::length(glm::ballRand(2.0f));
ResultDouble += glm::length(glm::ballRand(2.0));
}
Error += ResultFloat < 200000.f ? 0 : 1;
Error += ResultDouble < 200000.0 ? 0 : 1;
assert(!Error);
}
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return Error;
}
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/*
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#if(GLM_LANG & GLM_LANG_CXX0X_FLAG)
int test_grid()
{
int Error = 0;
typedef std::array<int, 8> colors;
typedef std::array<int, 8 * 8> grid;
grid Grid;
colors Colors;
grid GridBest;
colors ColorsBest;
while(true)
{
for(std::size_t i = 0; i < Grid.size(); ++i)
Grid[i] = int(glm::linearRand(0.0, 8.0 * 8.0 * 8.0 - 1.0) / 64.0);
for(std::size_t i = 0; i < Grid.size(); ++i)
++Colors[Grid[i]];
bool Exit = true;
for(std::size_t i = 0; i < Colors.size(); ++i)
{
if(Colors[i] == 8)
continue;
Exit = false;
break;
}
if(Exit == true)
break;
}
return Error;
}
#endif
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*/
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int main()
{
int Error = 0;
Error += test_linearRand();
Error += test_circularRand();
Error += test_sphericalRand();
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Error += test_diskRand();
Error += test_ballRand();
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/*
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#if(GLM_LANG & GLM_LANG_CXX0X_FLAG)
Error += test_grid();
#endif
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*/
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return Error;
}