66 lines
2.6 KiB
C++
66 lines
2.6 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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/// OpenGL Mathematics (glm.g-truc.net)
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///
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/// Copyright (c) 2005 - 2015 G-Truc Creation (www.g-truc.net)
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/// Permission is hereby granted, free of charge, to any person obtaining a copy
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/// of this software and associated documentation files (the "Software"), to deal
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/// in the Software without restriction, including without limitation the rights
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/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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/// copies of the Software, and to permit persons to whom the Software is
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/// furnished to do so, subject to the following conditions:
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///
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/// The above copyright notice and this permission notice shall be included in
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/// all copies or substantial portions of the Software.
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///
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/// Restrictions:
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/// By making use of the Software for military purposes, you choose to make
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/// a Bunny unhappy.
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///
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/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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/// THE SOFTWARE.
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///
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/// @ref gtc_integer
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/// @file glm/gtc/integer.inl
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/// @date 2014-11-17 / 2014-11-17
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/// @author Christophe Riccio
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///////////////////////////////////////////////////////////////////////////////////
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namespace glm{
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namespace detail
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{
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template <typename T, precision P, template <class, precision> class vecType>
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struct compute_log2<T, P, vecType, false>
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{
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GLM_FUNC_QUALIFIER static vecType<T, P> call(vecType<T, P> const & vec)
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{
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//Equivalent to return findMSB(vec); but save one function call in ASM with VC
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//return findMSB(vec);
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return vecType<T, P>(detail::compute_findMSB_vec<T, P, vecType, sizeof(T) * 8>::call(vec));
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}
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};
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# if GLM_HAS_BITSCAN_WINDOWS
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template <precision P>
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struct compute_log2<int, P, tvec4, false>
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{
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GLM_FUNC_QUALIFIER static tvec4<int, P> call(tvec4<int, P> const & vec)
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{
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tvec4<int, P> Result(glm::uninitialize);
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_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.x), vec.x);
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_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.y), vec.y);
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_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.z), vec.z);
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_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.w), vec.w);
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return Result;
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}
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};
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# endif//GLM_HAS_BITSCAN_WINDOWS
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}//namespace detail
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}//namespace glm
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