round.inl

 
 
#include "../integer.hpp"
#include "../ext/vector_integer.hpp"
 
namespace glm{
namespace detail
{
    template<bool is_float, bool is_signed>
    struct compute_roundMultiple {};
 
    template<>
    struct compute_roundMultiple<true, true>
    {
        template<typename genType>
        GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
        {
            if (Source >= genType(0))
                return Source - std::fmod(Source, Multiple);
            else
            {
                genType Tmp = Source + genType(1);
                return Tmp - std::fmod(Tmp, Multiple) - Multiple;
            }
        }
    };
 
    template<>
    struct compute_roundMultiple<false, false>
    {
        template<typename genType>
        GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
        {
            if (Source >= genType(0))
                return Source - Source % Multiple;
            else
            {
                genType Tmp = Source + genType(1);
                return Tmp - Tmp % Multiple - Multiple;
            }
        }
    };
 
    template<>
    struct compute_roundMultiple<false, true>
    {
        template<typename genType>
        GLM_FUNC_QUALIFIER static genType call(genType Source, genType Multiple)
        {
            if (Source >= genType(0))
                return Source - Source % Multiple;
            else
            {
                genType Tmp = Source + genType(1);
                return Tmp - Tmp % Multiple - Multiple;
            }
        }
    };
}//namespace detail
 
    // ceilPowerOfTwo
 
    template<typename genType>
    GLM_FUNC_QUALIFIER genType ceilPowerOfTwo(genType value)
    {
        return detail::compute_ceilPowerOfTwo<1, genType, defaultp, std::numeric_limits<genType>::is_signed>::call(vec<1, genType, defaultp>(value)).x;
    }
 
    template<length_t L, typename T, qualifier Q>
    GLM_FUNC_QUALIFIER vec<L, T, Q> ceilPowerOfTwo(vec<L, T, Q> const& v)
    {
        return detail::compute_ceilPowerOfTwo<L, T, Q, std::numeric_limits<T>::is_signed>::call(v);
    }
 
    // floorPowerOfTwo
 
    template<typename genType>
    GLM_FUNC_QUALIFIER genType floorPowerOfTwo(genType value)
    {
        return isPowerOfTwo(value) ? value : static_cast<genType>(1) << findMSB(value);
    }
 
    template<length_t L, typename T, qualifier Q>
    GLM_FUNC_QUALIFIER vec<L, T, Q> floorPowerOfTwo(vec<L, T, Q> const& v)
    {
        return detail::functor1<vec, L, T, T, Q>::call(floorPowerOfTwo, v);
    }
 
    // roundPowerOfTwo
 
    template<typename genIUType>
    GLM_FUNC_QUALIFIER genIUType roundPowerOfTwo(genIUType value)
    {
        if(isPowerOfTwo(value))
            return value;
 
        genIUType const prev = static_cast<genIUType>(1) << findMSB(value);
        genIUType const next = prev << static_cast<genIUType>(1);
        return (next - value) < (value - prev) ? next : prev;
    }
 
    template<length_t L, typename T, qualifier Q>
    GLM_FUNC_QUALIFIER vec<L, T, Q> roundPowerOfTwo(vec<L, T, Q> const& v)
    {
        return detail::functor1<vec, L, T, T, Q>::call(roundPowerOfTwo, v);
    }
 
    // ceilMultiple
 
    template<typename genType>
    GLM_FUNC_QUALIFIER genType ceilMultiple(genType Source, genType Multiple)
    {
        return detail::compute_ceilMultiple<std::numeric_limits<genType>::is_iec559, std::numeric_limits<genType>::is_signed>::call(Source, Multiple);
    }
 
    template<length_t L, typename T, qualifier Q>
    GLM_FUNC_QUALIFIER vec<L, T, Q> ceilMultiple(vec<L, T, Q> const& Source, vec<L, T, Q> const& Multiple)
    {
        return detail::functor2<vec, L, T, Q>::call(ceilMultiple, Source, Multiple);
    }
 
    // floorMultiple
 
    template<typename genType>
    GLM_FUNC_QUALIFIER genType floorMultiple(genType Source, genType Multiple)
    {
        return detail::compute_floorMultiple<std::numeric_limits<genType>::is_iec559, std::numeric_limits<genType>::is_signed>::call(Source, Multiple);
    }
 
    template<length_t L, typename T, qualifier Q>
    GLM_FUNC_QUALIFIER vec<L, T, Q> floorMultiple(vec<L, T, Q> const& Source, vec<L, T, Q> const& Multiple)
    {
        return detail::functor2<vec, L, T, Q>::call(floorMultiple, Source, Multiple);
    }
 
    // roundMultiple
 
    template<typename genType>
    GLM_FUNC_QUALIFIER genType roundMultiple(genType Source, genType Multiple)
    {
        return detail::compute_roundMultiple<std::numeric_limits<genType>::is_iec559, std::numeric_limits<genType>::is_signed>::call(Source, Multiple);
    }
 
    template<length_t L, typename T, qualifier Q>
    GLM_FUNC_QUALIFIER vec<L, T, Q> roundMultiple(vec<L, T, Q> const& Source, vec<L, T, Q> const& Multiple)
    {
        return detail::functor2<vec, L, T, Q>::call(roundMultiple, Source, Multiple);
    }
}//namespace glm