68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
/// @ref gtc_integer
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namespace glm{
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namespace detail
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{
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template<length_t L, typename T, qualifier Q, bool Aligned>
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struct compute_log2<L, T, Q, false, Aligned>
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{
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GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& v)
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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 vec<L, T, Q>(detail::compute_findMSB_vec<L, T, Q, sizeof(T) * 8>::call(v));
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}
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};
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# if GLM_HAS_BITSCAN_WINDOWS
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template<qualifier Q, bool Aligned>
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struct compute_log2<4, int, Q, false, Aligned>
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{
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GLM_FUNC_QUALIFIER static vec<4, int, Q> call(vec<4, int, Q> const& v)
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{
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vec<4, int, Q> Result;
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_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.x), v.x);
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_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.y), v.y);
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_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.z), v.z);
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_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.w), v.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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template<typename genType>
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GLM_FUNC_QUALIFIER int iround(genType x)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'iround' only accept floating-point inputs");
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assert(static_cast<genType>(0.0) <= x);
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return static_cast<int>(x + static_cast<genType>(0.5));
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}
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template<length_t L, typename T, qualifier Q>
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GLM_FUNC_QUALIFIER vec<L, int, Q> iround(vec<L, T, Q> const& x)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'iround' only accept floating-point inputs");
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assert(all(lessThanEqual(vec<L, T, Q>(0), x)));
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return vec<L, int, Q>(x + static_cast<T>(0.5));
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}
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template<typename genType>
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GLM_FUNC_QUALIFIER uint uround(genType x)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'uround' only accept floating-point inputs");
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assert(static_cast<genType>(0.0) <= x);
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return static_cast<uint>(x + static_cast<genType>(0.5));
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}
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template<length_t L, typename T, qualifier Q>
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GLM_FUNC_QUALIFIER vec<L, uint, Q> uround(vec<L, T, Q> const& x)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'uround' only accept floating-point inputs");
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assert(all(lessThanEqual(vec<L, T, Q>(0), x)));
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return vec<L, uint, Q>(x + static_cast<T>(0.5));
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}
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}//namespace glm
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