93 lines
2.2 KiB
Text
93 lines
2.2 KiB
Text
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/// @ref gtx_bit
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namespace glm
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{
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///////////////////
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// highestBitValue
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template<typename genIUType>
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GLM_FUNC_QUALIFIER genIUType highestBitValue(genIUType Value)
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{
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genIUType tmp = Value;
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genIUType result = genIUType(0);
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while(tmp)
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{
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result = (tmp & (~tmp + 1)); // grab lowest bit
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tmp &= ~result; // clear lowest bit
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}
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return result;
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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> highestBitValue(vec<L, T, Q> const& v)
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{
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return detail::functor1<vec, L, T, T, Q>::call(highestBitValue, v);
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}
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///////////////////
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// lowestBitValue
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template<typename genIUType>
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GLM_FUNC_QUALIFIER genIUType lowestBitValue(genIUType Value)
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{
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return (Value & (~Value + 1));
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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> lowestBitValue(vec<L, T, Q> const& v)
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{
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return detail::functor1<vec, L, T, T, Q>::call(lowestBitValue, v);
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}
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///////////////////
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// powerOfTwoAbove
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template<typename genType>
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GLM_FUNC_QUALIFIER genType powerOfTwoAbove(genType value)
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{
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return isPowerOfTwo(value) ? value : highestBitValue(value) << 1;
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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> powerOfTwoAbove(vec<L, T, Q> const& v)
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{
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return detail::functor1<vec, L, T, T, Q>::call(powerOfTwoAbove, v);
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}
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///////////////////
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// powerOfTwoBelow
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template<typename genType>
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GLM_FUNC_QUALIFIER genType powerOfTwoBelow(genType value)
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{
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return isPowerOfTwo(value) ? value : highestBitValue(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> powerOfTwoBelow(vec<L, T, Q> const& v)
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{
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return detail::functor1<vec, L, T, T, Q>::call(powerOfTwoBelow, v);
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}
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/////////////////////
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// powerOfTwoNearest
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template<typename genType>
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GLM_FUNC_QUALIFIER genType powerOfTwoNearest(genType value)
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{
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if(isPowerOfTwo(value))
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return value;
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genType const prev = highestBitValue(value);
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genType const next = prev << 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> powerOfTwoNearest(vec<L, T, Q> const& v)
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{
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return detail::functor1<vec, L, T, T, Q>::call(powerOfTwoNearest, v);
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}
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}//namespace glm
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