1/// @ref gtc_integer 2/// @file glm/gtc/integer.inl 3 4namespace glm{ 5namespace detail 6{ 7 template <typename T, precision P, template <typename, precision> class vecType, bool Aligned> 8 struct compute_log2<T, P, vecType, false, Aligned> 9 { 10 GLM_FUNC_QUALIFIER static vecType<T, P> call(vecType<T, P> const & vec) 11 { 12 //Equivalent to return findMSB(vec); but save one function call in ASM with VC 13 //return findMSB(vec); 14 return vecType<T, P>(detail::compute_findMSB_vec<T, P, vecType, sizeof(T) * 8>::call(vec)); 15 } 16 }; 17 18# if GLM_HAS_BITSCAN_WINDOWS 19 template <precision P, bool Aligned> 20 struct compute_log2<int, P, tvec4, false, Aligned> 21 { 22 GLM_FUNC_QUALIFIER static tvec4<int, P> call(tvec4<int, P> const & vec) 23 { 24 tvec4<int, P> Result(glm::uninitialize); 25 26 _BitScanReverse(reinterpret_cast<unsigned long*>(&Result.x), vec.x); 27 _BitScanReverse(reinterpret_cast<unsigned long*>(&Result.y), vec.y); 28 _BitScanReverse(reinterpret_cast<unsigned long*>(&Result.z), vec.z); 29 _BitScanReverse(reinterpret_cast<unsigned long*>(&Result.w), vec.w); 30 31 return Result; 32 } 33 }; 34# endif//GLM_HAS_BITSCAN_WINDOWS 35}//namespace detail 36 template <typename genType> 37 GLM_FUNC_QUALIFIER int iround(genType x) 38 { 39 GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'iround' only accept floating-point inputs"); 40 assert(static_cast<genType>(0.0) <= x); 41 42 return static_cast<int>(x + static_cast<genType>(0.5)); 43 } 44 45 template <typename T, precision P, template <typename, precision> class vecType> 46 GLM_FUNC_QUALIFIER vecType<int, P> iround(vecType<T, P> const& x) 47 { 48 GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'iround' only accept floating-point inputs"); 49 assert(all(lessThanEqual(vecType<T, P>(0), x))); 50 51 return vecType<int, P>(x + static_cast<T>(0.5)); 52 } 53 54 template <typename genType> 55 GLM_FUNC_QUALIFIER uint uround(genType x) 56 { 57 GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'uround' only accept floating-point inputs"); 58 assert(static_cast<genType>(0.0) <= x); 59 60 return static_cast<uint>(x + static_cast<genType>(0.5)); 61 } 62 63 template <typename T, precision P, template <typename, precision> class vecType> 64 GLM_FUNC_QUALIFIER vecType<uint, P> uround(vecType<T, P> const& x) 65 { 66 GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'uround' only accept floating-point inputs"); 67 assert(all(lessThanEqual(vecType<T, P>(0), x))); 68 69 return vecType<uint, P>(x + static_cast<T>(0.5)); 70 } 71}//namespace glm 72