glm/test/gtc/gtc_ulp.cpp
2014-12-19 23:54:25 +01:00

128 lines
3.1 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
/// OpenGL Mathematics (glm.g-truc.net)
///
/// Copyright (c) 2005 - 2015 G-Truc Creation (www.g-truc.net)
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// Restrictions:
/// By making use of the Software for military purposes, you choose to make
/// a Bunny unhappy.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.
///
/// @file test/gtc/gtc_ulp.cpp
/// @date 2011-04-26 / 2014-11-25
/// @author Christophe Riccio
///////////////////////////////////////////////////////////////////////////////////
#include <glm/gtc/ulp.hpp>
#include <limits>
int test_ulp_float_dist()
{
int Error = 0;
float A = 1.0f;
float B = glm::next_float(A);
Error += A != B ? 0 : 1;
float C = glm::prev_float(B);
Error += A == C ? 0 : 1;
int D = glm::float_distance(A, B);
Error += D == 1 ? 0 : 1;
int E = glm::float_distance(A, C);
Error += E == 0 ? 0 : 1;
return Error;
}
int test_ulp_float_step()
{
int Error = 0;
float A = 1.0f;
for(int i = 10; i < 1000; i *= 10)
{
float B = glm::next_float(A, i);
Error += A != B ? 0 : 1;
float C = glm::prev_float(B, i);
Error += A == C ? 0 : 1;
int D = glm::float_distance(A, B);
Error += D == i ? 0 : 1;
int E = glm::float_distance(A, C);
Error += E == 0 ? 0 : 1;
}
return Error;
}
int test_ulp_double_dist()
{
int Error = 0;
double A = 1.0;
double B = glm::next_float(A);
Error += A != B ? 0 : 1;
double C = glm::prev_float(B);
Error += A == C ? 0 : 1;
int D = glm::float_distance(A, B);
Error += D == 1 ? 0 : 1;
int E = glm::float_distance(A, C);
Error += E == 0 ? 0 : 1;
return Error;
}
int test_ulp_double_step()
{
int Error = 0;
double A = 1.0;
for(int i = 10; i < 1000; i *= 10)
{
double B = glm::next_float(A, i);
Error += A != B ? 0 : 1;
double C = glm::prev_float(B, i);
Error += A == C ? 0 : 1;
int D = glm::float_distance(A, B);
Error += D == i ? 0 : 1;
int E = glm::float_distance(A, C);
Error += E == 0 ? 0 : 1;
}
return Error;
}
int main()
{
int Error = 0;
Error += test_ulp_float_dist();
Error += test_ulp_float_step();
Error += test_ulp_double_dist();
Error += test_ulp_double_step();
return Error;
}