/// @ref gtx_bit /// @file glm/gtx/bit.inl namespace glm { /////////////////// // highestBitValue template <typename genIUType> GLM_FUNC_QUALIFIER genIUType highestBitValue(genIUType Value) { genIUType tmp = Value; genIUType result = genIUType(0); while(tmp) { result = (tmp & (~tmp + 1)); // grab lowest bit tmp &= ~result; // clear lowest bit } return result; } template <typename T, precision P, template <typename, precision> class vecType> GLM_FUNC_QUALIFIER vecType<T, P> highestBitValue(vecType<T, P> const & v) { return detail::functor1<T, T, P, vecType>::call(highestBitValue, v); } /////////////////// // lowestBitValue template <typename genIUType> GLM_FUNC_QUALIFIER genIUType lowestBitValue(genIUType Value) { return (Value & (~Value + 1)); } template <typename T, precision P, template <typename, precision> class vecType> GLM_FUNC_QUALIFIER vecType<T, P> lowestBitValue(vecType<T, P> const & v) { return detail::functor1<T, T, P, vecType>::call(lowestBitValue, v); } /////////////////// // powerOfTwoAbove template <typename genType> GLM_FUNC_QUALIFIER genType powerOfTwoAbove(genType value) { return isPowerOfTwo(value) ? value : highestBitValue(value) << 1; } template <typename T, precision P, template <typename, precision> class vecType> GLM_FUNC_QUALIFIER vecType<T, P> powerOfTwoAbove(vecType<T, P> const & v) { return detail::functor1<T, T, P, vecType>::call(powerOfTwoAbove, v); } /////////////////// // powerOfTwoBelow template <typename genType> GLM_FUNC_QUALIFIER genType powerOfTwoBelow(genType value) { return isPowerOfTwo(value) ? value : highestBitValue(value); } template <typename T, precision P, template <typename, precision> class vecType> GLM_FUNC_QUALIFIER vecType<T, P> powerOfTwoBelow(vecType<T, P> const & v) { return detail::functor1<T, T, P, vecType>::call(powerOfTwoBelow, v); } ///////////////////// // powerOfTwoNearest template <typename genType> GLM_FUNC_QUALIFIER genType powerOfTwoNearest(genType value) { if(isPowerOfTwo(value)) return value; genType const prev = highestBitValue(value); genType const next = prev << 1; return (next - value) < (value - prev) ? next : prev; } template <typename T, precision P, template <typename, precision> class vecType> GLM_FUNC_QUALIFIER vecType<T, P> powerOfTwoNearest(vecType<T, P> const & v) { return detail::functor1<T, T, P, vecType>::call(powerOfTwoNearest, v); } }//namespace glm