integer.h

#pragma once
 
#include <type_traits>
 
#include "fvec.h"
 
#define IS_INTEGRAL_GUARD typename std::enable_if<std::is_integral<T>::value, bool>::type = true
 
namespace cgv {
namespace math {
 
template<typename T, IS_INTEGRAL_GUARD>
T is_power_of_two(T x) {
    return x > 0 && (x & (x - 1)) == 0;
}
 
template<typename T, IS_INTEGRAL_GUARD>
T next_power_of_two(T x) {
    T pot = T(1);
    while(x > pot)
        pot <<= T(1);
    return pot;
}
 
template<typename T, IS_INTEGRAL_GUARD>
T next_multiple_k_greater_than_n(T k, T n) {
    T remainder = k - (n % k);
    if(n % k == T(0))
        remainder = T(0);
    return n + remainder;
}
 
template<typename T, IS_INTEGRAL_GUARD>
T div_round_up(T a, T b) {
    return (a + b - T(1)) / b;
}
 
template<typename T, cgv::type::uint32_type N, IS_INTEGRAL_GUARD>
fvec<T, N> div_round_up(fvec<T, N> a, fvec<T, N> b) {
    return (a + b - T(1)) / b;
}
 
} // namespace math
} // namespace cgv
 
#undef IS_INTEGRAL_GUARD