diff options
Diffstat (limited to 'src/include/glm/detail/func_exponential.inl')
| -rw-r--r-- | src/include/glm/detail/func_exponential.inl | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/src/include/glm/detail/func_exponential.inl b/src/include/glm/detail/func_exponential.inl new file mode 100644 index 0000000..477b377 --- /dev/null +++ b/src/include/glm/detail/func_exponential.inl @@ -0,0 +1,152 @@ +/// @ref core
+/// @file glm/detail/func_exponential.inl
+
+#include "../vector_relational.hpp"
+#include "_vectorize.hpp"
+#include <limits>
+#include <cmath>
+#include <cassert>
+
+namespace glm{
+namespace detail
+{
+# if GLM_HAS_CXX11_STL
+ using std::log2;
+# else
+ template<typename genType>
+ genType log2(genType Value)
+ {
+ return std::log(Value) * static_cast<genType>(1.4426950408889634073599246810019);
+ }
+# endif
+
+ template<length_t L, typename T, qualifier Q, bool isFloat, bool Aligned>
+ struct compute_log2
+ {
+ GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& v)
+ {
+ GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'log2' only accept floating-point inputs. Include <glm/gtc/integer.hpp> for integer inputs.");
+
+ return detail::functor1<vec, L, T, T, Q>::call(log2, v);
+ }
+ };
+
+ template<length_t L, typename T, qualifier Q, bool Aligned>
+ struct compute_sqrt
+ {
+ GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& x)
+ {
+ return detail::functor1<vec, L, T, T, Q>::call(std::sqrt, x);
+ }
+ };
+
+ template<length_t L, typename T, qualifier Q, bool Aligned>
+ struct compute_inversesqrt
+ {
+ GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& x)
+ {
+ return static_cast<T>(1) / sqrt(x);
+ }
+ };
+
+ template<length_t L, bool Aligned>
+ struct compute_inversesqrt<L, float, lowp, Aligned>
+ {
+ GLM_FUNC_QUALIFIER static vec<L, float, lowp> call(vec<L, float, lowp> const& x)
+ {
+ vec<L, float, lowp> tmp(x);
+ vec<L, float, lowp> xhalf(tmp * 0.5f);
+ vec<L, uint, lowp>* p = reinterpret_cast<vec<L, uint, lowp>*>(const_cast<vec<L, float, lowp>*>(&x));
+ vec<L, uint, lowp> i = vec<L, uint, lowp>(0x5f375a86) - (*p >> vec<L, uint, lowp>(1));
+ vec<L, float, lowp>* ptmp = reinterpret_cast<vec<L, float, lowp>*>(&i);
+ tmp = *ptmp;
+ tmp = tmp * (1.5f - xhalf * tmp * tmp);
+ return tmp;
+ }
+ };
+}//namespace detail
+
+ // pow
+ using std::pow;
+ template<length_t L, typename T, qualifier Q>
+ GLM_FUNC_QUALIFIER vec<L, T, Q> pow(vec<L, T, Q> const& base, vec<L, T, Q> const& exponent)
+ {
+ return detail::functor2<vec, L, T, Q>::call(pow, base, exponent);
+ }
+
+ // exp
+ using std::exp;
+ template<length_t L, typename T, qualifier Q>
+ GLM_FUNC_QUALIFIER vec<L, T, Q> exp(vec<L, T, Q> const& x)
+ {
+ return detail::functor1<vec, L, T, T, Q>::call(exp, x);
+ }
+
+ // log
+ using std::log;
+ template<length_t L, typename T, qualifier Q>
+ GLM_FUNC_QUALIFIER vec<L, T, Q> log(vec<L, T, Q> const& x)
+ {
+ return detail::functor1<vec, L, T, T, Q>::call(log, x);
+ }
+
+# if GLM_HAS_CXX11_STL
+ using std::exp2;
+# else
+ //exp2, ln2 = 0.69314718055994530941723212145818f
+ template<typename genType>
+ GLM_FUNC_QUALIFIER genType exp2(genType x)
+ {
+ GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'exp2' only accept floating-point inputs");
+
+ return std::exp(static_cast<genType>(0.69314718055994530941723212145818) * x);
+ }
+# endif
+
+ template<length_t L, typename T, qualifier Q>
+ GLM_FUNC_QUALIFIER vec<L, T, Q> exp2(vec<L, T, Q> const& x)
+ {
+ return detail::functor1<vec, L, T, T, Q>::call(exp2, x);
+ }
+
+ // log2, ln2 = 0.69314718055994530941723212145818f
+ template<typename genType>
+ GLM_FUNC_QUALIFIER genType log2(genType x)
+ {
+ return log2(vec<1, genType>(x)).x;
+ }
+
+ template<length_t L, typename T, qualifier Q>
+ GLM_FUNC_QUALIFIER vec<L, T, Q> log2(vec<L, T, Q> const& x)
+ {
+ return detail::compute_log2<L, T, Q, std::numeric_limits<T>::is_iec559, detail::is_aligned<Q>::value>::call(x);
+ }
+
+ // sqrt
+ using std::sqrt;
+ template<length_t L, typename T, qualifier Q>
+ GLM_FUNC_QUALIFIER vec<L, T, Q> sqrt(vec<L, T, Q> const& x)
+ {
+ GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'sqrt' only accept floating-point inputs");
+ return detail::compute_sqrt<L, T, Q, detail::is_aligned<Q>::value>::call(x);
+ }
+
+ // inversesqrt
+ template<typename genType>
+ GLM_FUNC_QUALIFIER genType inversesqrt(genType x)
+ {
+ return static_cast<genType>(1) / sqrt(x);
+ }
+
+ template<length_t L, typename T, qualifier Q>
+ GLM_FUNC_QUALIFIER vec<L, T, Q> inversesqrt(vec<L, T, Q> const& x)
+ {
+ GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'inversesqrt' only accept floating-point inputs");
+ return detail::compute_inversesqrt<L, T, Q, detail::is_aligned<Q>::value>::call(x);
+ }
+}//namespace glm
+
+#if GLM_CONFIG_SIMD == GLM_ENABLE
+# include "func_exponential_simd.inl"
+#endif
+
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