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Diffstat (limited to '3rdparty/include/glm/gtx/bit.inl')
-rw-r--r-- | 3rdparty/include/glm/gtx/bit.inl | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/3rdparty/include/glm/gtx/bit.inl b/3rdparty/include/glm/gtx/bit.inl new file mode 100644 index 0000000..5178a12 --- /dev/null +++ b/3rdparty/include/glm/gtx/bit.inl @@ -0,0 +1,107 @@ +/////////////////////////////////////////////////////////////////////////////////// +/// 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 |