///////////////////////////////////////////////////////////////////////////////////////////////////
// OpenGL Mathematics Copyright (c) 2005 - 2013 G-Truc Creation (www.g-truc.net)
///////////////////////////////////////////////////////////////////////////////////////////////////
// Created : 2012-09-19
// Updated : 2012-09-19
// Licence : This source is under MIT licence
// File    : test/gtc/epsilon.cpp
///////////////////////////////////////////////////////////////////////////////////////////////////

#include <glm/glm.hpp>
#include <glm/gtc/half_float.hpp>
#include <glm/gtc/epsilon.hpp>
#include <glm/gtc/constants.hpp>

int test_defined()
{
	glm::epsilonEqual(glm::vec2(), glm::vec2(), glm::vec2());
	glm::epsilonEqual(glm::vec3(), glm::vec3(), glm::vec3());
	glm::epsilonEqual(glm::vec4(), glm::vec4(), glm::vec4());

	glm::epsilonNotEqual(glm::vec2(), glm::vec2(), glm::vec2());
	glm::epsilonNotEqual(glm::vec3(), glm::vec3(), glm::vec3());
	glm::epsilonNotEqual(glm::vec4(), glm::vec4(), glm::vec4());
	
	glm::epsilonEqual(glm::vec2(), glm::vec2(), 0.0f);
	glm::epsilonEqual(glm::vec3(), glm::vec3(), 0.0f);
	glm::epsilonEqual(glm::vec4(), glm::vec4(), 0.0f);
	glm::epsilonEqual(glm::quat(), glm::quat(), 0.0f);

	glm::epsilonNotEqual(glm::vec2(), glm::vec2(), 0.0f);
	glm::epsilonNotEqual(glm::vec3(), glm::vec3(), 0.0f);
	glm::epsilonNotEqual(glm::vec4(), glm::vec4(), 0.0f);
	glm::epsilonNotEqual(glm::quat(), glm::quat(), 0.0f);

	return 0;
}

template <typename T>
int test_equal()
{
	int Error(0);
	
	{
		T A = glm::epsilon<T>();
		T B = glm::epsilon<T>();
		Error += glm::epsilonEqual(A, B, glm::epsilon<T>() * T(2)) ? 0 : 1;
	}

	{
		T A(0);
		T B = T(0) + glm::epsilon<T>();
		Error += glm::epsilonEqual(A, B, glm::epsilon<T>() * T(2)) ? 0 : 1;
	}

	{
		T A(0);
		T B = T(0) - glm::epsilon<T>();
		Error += glm::epsilonEqual(A, B, glm::epsilon<T>() * T(2)) ? 0 : 1;
	}

	{
		T A = T(0) + glm::epsilon<T>();
		T B = T(0);
		Error += glm::epsilonEqual(A, B, glm::epsilon<T>() * T(2)) ? 0 : 1;
	}

	{
		T A = T(0) - glm::epsilon<T>();
		T B = T(0);
		Error += glm::epsilonEqual(A, B, glm::epsilon<T>() * T(2)) ? 0 : 1;
	}

	return Error;
}

int main()
{
	int Error(0);

	Error += test_defined();
	Error += test_equal<glm::half>();
	Error += test_equal<float>();
	Error += test_equal<double>();

	return Error;
}