/// @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 |