93 lines
2.3 KiB
Plaintext
93 lines
2.3 KiB
Plaintext
|
/// @ref gtx_bit
|
||
|
|
|
||
|
|
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<length_t L, typename T, qualifier Q>
|
||
|
|
GLM_FUNC_QUALIFIER vec<L, T, Q> highestBitValue(vec<L, T, Q> const& v)
|
||
|
|
{
|
||
|
|
return detail::functor1<vec, L, T, T, Q>::call(highestBitValue, v);
|
||
|
|
}
|
||
|
|
|
||
|
|
///////////////////
|
||
|
|
// lowestBitValue
|
||
|
|
|
||
|
|
template<typename genIUType>
|
||
|
|
GLM_FUNC_QUALIFIER genIUType lowestBitValue(genIUType Value)
|
||
|
|
{
|
||
|
|
return (Value & (~Value + 1));
|
||
|
|
}
|
||
|
|
|
||
|
|
template<length_t L, typename T, qualifier Q>
|
||
|
|
GLM_FUNC_QUALIFIER vec<L, T, Q> lowestBitValue(vec<L, T, Q> const& v)
|
||
|
|
{
|
||
|
|
return detail::functor1<vec, L, T, T, Q>::call(lowestBitValue, v);
|
||
|
|
}
|
||
|
|
|
||
|
|
///////////////////
|
||
|
|
// powerOfTwoAbove
|
||
|
|
|
||
|
|
template<typename genType>
|
||
|
|
GLM_FUNC_QUALIFIER genType powerOfTwoAbove(genType value)
|
||
|
|
{
|
||
|
|
return isPowerOfTwo(value) ? value : highestBitValue(value) << 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
template<length_t L, typename T, qualifier Q>
|
||
|
|
GLM_FUNC_QUALIFIER vec<L, T, Q> powerOfTwoAbove(vec<L, T, Q> const& v)
|
||
|
|
{
|
||
|
|
return detail::functor1<vec, L, T, T, Q>::call(powerOfTwoAbove, v);
|
||
|
|
}
|
||
|
|
|
||
|
|
///////////////////
|
||
|
|
// powerOfTwoBelow
|
||
|
|
|
||
|
|
template<typename genType>
|
||
|
|
GLM_FUNC_QUALIFIER genType powerOfTwoBelow(genType value)
|
||
|
|
{
|
||
|
|
return isPowerOfTwo(value) ? value : highestBitValue(value);
|
||
|
|
}
|
||
|
|
|
||
|
|
template<length_t L, typename T, qualifier Q>
|
||
|
|
GLM_FUNC_QUALIFIER vec<L, T, Q> powerOfTwoBelow(vec<L, T, Q> const& v)
|
||
|
|
{
|
||
|
|
return detail::functor1<vec, L, T, T, Q>::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<length_t L, typename T, qualifier Q>
|
||
|
|
GLM_FUNC_QUALIFIER vec<L, T, Q> powerOfTwoNearest(vec<L, T, Q> const& v)
|
||
|
|
{
|
||
|
|
return detail::functor1<vec, L, T, T, Q>::call(powerOfTwoNearest, v);
|
||
|
|
}
|
||
|
|
|
||
|
|
}//namespace glm
|