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-rw-r--r--depedencies/include/glm/gtx/fast_square_root.inl81
1 files changed, 81 insertions, 0 deletions
diff --git a/depedencies/include/glm/gtx/fast_square_root.inl b/depedencies/include/glm/gtx/fast_square_root.inl
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+++ b/depedencies/include/glm/gtx/fast_square_root.inl
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+/// @ref gtx_fast_square_root
+/// @file glm/gtx/fast_square_root.inl
+
+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 <typename T, precision P, template <typename, precision> class vecType>
+ GLM_FUNC_QUALIFIER vecType<T, P> fastSqrt(vecType<T, P> const & x)
+ {
+ return detail::functor1<T, T, P, vecType>::call(fastSqrt, x);
+ }
+
+ // fastInversesqrt
+ template <typename genType>
+ GLM_FUNC_QUALIFIER genType fastInverseSqrt(genType x)
+ {
+# ifdef __CUDACC__ // Wordaround for a CUDA compiler bug up to CUDA6
+ tvec1<T, P> tmp(detail::compute_inversesqrt<tvec1, genType, lowp, detail::is_aligned<lowp>::value>::call(tvec1<genType, lowp>(x)));
+ return tmp.x;
+# else
+ return detail::compute_inversesqrt<tvec1, genType, highp, detail::is_aligned<highp>::value>::call(tvec1<genType, lowp>(x)).x;
+# endif
+ }
+
+ template <typename T, precision P, template <typename, precision> class vecType>
+ GLM_FUNC_QUALIFIER vecType<T, P> fastInverseSqrt(vecType<T, P> const & x)
+ {
+ return detail::compute_inversesqrt<vecType, T, P, detail::is_aligned<P>::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 <typename T, precision P, template <typename, precision> class vecType>
+ GLM_FUNC_QUALIFIER T fastLength(vecType<T, P> 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 <typename T, precision P, template <typename, precision> class vecType>
+ GLM_FUNC_QUALIFIER T fastDistance(vecType<T, P> const & x, vecType<T, P> 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 <typename T, precision P, template <typename, precision> class vecType>
+ GLM_FUNC_QUALIFIER vecType<T, P> fastNormalize(vecType<T, P> const & x)
+ {
+ return x * fastInverseSqrt(dot(x, x));
+ }
+}//namespace glm