/// @ref gtc_round #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