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