mirror of
https://github.com/g-truc/glm.git
synced 2024-11-14 14:04:36 +00:00
73 lines
1.6 KiB
C++
73 lines
1.6 KiB
C++
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
// OpenGL Mathematics Copyright (c) 2005 - 2012 G-Truc Creation (www.g-truc.net)
|
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
// Created : 2011-10-11
|
|
// Updated : 2011-10-11
|
|
// Licence : This source is under MIT licence
|
|
// File : test/gtx/gtx_integer.cpp
|
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include <glm/glm.hpp>
|
|
#include <glm/gtx/integer.hpp>
|
|
#include <glm/gtx/epsilon.hpp>
|
|
#include <cstdio>
|
|
|
|
int test_floor_log2()
|
|
{
|
|
int Error = 0;
|
|
|
|
for(std::size_t i = 1; i < 1000000; ++i)
|
|
{
|
|
glm::uint A = glm::floor_log2(glm::uint(i));
|
|
glm::uint B = glm::uint(glm::floor(glm::log2(double(i)))); // Will fail with float, lack of accuracy
|
|
|
|
Error += A == B ? 0 : 1;
|
|
assert(!Error);
|
|
}
|
|
|
|
return Error;
|
|
}
|
|
|
|
int test_log2()
|
|
{
|
|
int Error = 0;
|
|
|
|
for(std::size_t i = 1; i < 24; ++i)
|
|
{
|
|
glm::uint A = glm::log2(glm::uint(1 << i));
|
|
glm::uint B = glm::uint(glm::log2(double(1 << i)));
|
|
|
|
//Error += glm::equalEpsilon(double(A), B, 1.0) ? 0 : 1;
|
|
Error += glm::abs(double(A) - B) <= 24 ? 0 : 1;
|
|
assert(!Error);
|
|
|
|
printf("Log2(%d) Error: %d, %d\n", 1 << i, A, B);
|
|
}
|
|
|
|
printf("log2 error: %d\n", Error);
|
|
|
|
return Error;
|
|
}
|
|
|
|
int test_nlz()
|
|
{
|
|
int Error = 0;
|
|
|
|
for(std::size_t i = 1; i < 33; ++i)
|
|
Error += glm::nlz(i) == 31u - glm::findMSB(i) ? 0 : 1;
|
|
//printf("%d, %d\n", glm::nlz(i), 31u - glm::findMSB(i));
|
|
|
|
return Error;
|
|
}
|
|
|
|
int main()
|
|
{
|
|
int Error = 0;
|
|
|
|
Error += test_nlz();
|
|
Error += test_floor_log2();
|
|
Error += test_log2();
|
|
|
|
return Error;
|
|
}
|