diff options
Diffstat (limited to 'src/include/glm/gtx/fast_square_root.inl')
-rw-r--r-- | src/include/glm/gtx/fast_square_root.inl | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/src/include/glm/gtx/fast_square_root.inl b/src/include/glm/gtx/fast_square_root.inl new file mode 100644 index 0000000..200d18b --- /dev/null +++ b/src/include/glm/gtx/fast_square_root.inl @@ -0,0 +1,75 @@ +/// @ref gtx_fast_square_root
+
+namespace glm
+{
+ // fastSqrt
+ template<typename genType>
+ GLM_FUNC_QUALIFIER genType fastSqrt(genType x)
+ {
+ GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'fastSqrt' only accept floating-point input");
+
+ return genType(1) / fastInverseSqrt(x);
+ }
+
+ template<length_t L, typename T, qualifier Q>
+ GLM_FUNC_QUALIFIER vec<L, T, Q> fastSqrt(vec<L, T, Q> const& x)
+ {
+ return detail::functor1<vec, L, T, T, Q>::call(fastSqrt, x);
+ }
+
+ // fastInversesqrt
+ template<typename genType>
+ GLM_FUNC_QUALIFIER genType fastInverseSqrt(genType x)
+ {
+ return detail::compute_inversesqrt<1, genType, lowp, detail::is_aligned<lowp>::value>::call(vec<1, genType, lowp>(x)).x;
+ }
+
+ template<length_t L, typename T, qualifier Q>
+ GLM_FUNC_QUALIFIER vec<L, T, Q> fastInverseSqrt(vec<L, T, Q> const& x)
+ {
+ return detail::compute_inversesqrt<L, T, Q, detail::is_aligned<Q>::value>::call(x);
+ }
+
+ // fastLength
+ template<typename genType>
+ GLM_FUNC_QUALIFIER genType fastLength(genType x)
+ {
+ GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'fastLength' only accept floating-point inputs");
+
+ return abs(x);
+ }
+
+ template<length_t L, typename T, qualifier Q>
+ GLM_FUNC_QUALIFIER T fastLength(vec<L, T, Q> const& x)
+ {
+ GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'fastLength' only accept floating-point inputs");
+
+ return fastSqrt(dot(x, x));
+ }
+
+ // fastDistance
+ template<typename genType>
+ GLM_FUNC_QUALIFIER genType fastDistance(genType x, genType y)
+ {
+ return fastLength(y - x);
+ }
+
+ template<length_t L, typename T, qualifier Q>
+ GLM_FUNC_QUALIFIER T fastDistance(vec<L, T, Q> const& x, vec<L, T, Q> const& y)
+ {
+ return fastLength(y - x);
+ }
+
+ // fastNormalize
+ template<typename genType>
+ GLM_FUNC_QUALIFIER genType fastNormalize(genType x)
+ {
+ return x > genType(0) ? genType(1) : -genType(1);
+ }
+
+ template<length_t L, typename T, qualifier Q>
+ GLM_FUNC_QUALIFIER vec<L, T, Q> fastNormalize(vec<L, T, Q> const& x)
+ {
+ return x * fastInverseSqrt(dot(x, x));
+ }
+}//namespace glm
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