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