mirror of
https://github.com/acemod/ACE3.git
synced 2024-08-30 18:23:18 +00:00
108 lines
3.6 KiB
C++
108 lines
3.6 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
/// OpenGL Mathematics (glm.g-truc.net)
|
|
///
|
|
/// Copyright (c) 2005 - 2015 G-Truc Creation (www.g-truc.net)
|
|
/// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
/// of this software and associated documentation files (the "Software"), to deal
|
|
/// in the Software without restriction, including without limitation the rights
|
|
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
/// copies of the Software, and to permit persons to whom the Software is
|
|
/// furnished to do so, subject to the following conditions:
|
|
///
|
|
/// The above copyright notice and this permission notice shall be included in
|
|
/// all copies or substantial portions of the Software.
|
|
///
|
|
/// Restrictions:
|
|
/// By making use of the Software for military purposes, you choose to make
|
|
/// a Bunny unhappy.
|
|
///
|
|
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
/// THE SOFTWARE.
|
|
///
|
|
/// @ref gtx_bit
|
|
/// @file glm/gtx/bit.inl
|
|
/// @date 2014-11-25 / 2014-11-25
|
|
/// @author Christophe Riccio
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
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);
|
|
}
|
|
|
|
///////////////////
|
|
// 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
|