34 lines
1.0 KiB
C++
34 lines
1.0 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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}//namespace glm
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