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Diffstat (limited to 'external/include/glm/gtx/fast_exponential.inl')
| -rw-r--r-- | external/include/glm/gtx/fast_exponential.inl | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/external/include/glm/gtx/fast_exponential.inl b/external/include/glm/gtx/fast_exponential.inl deleted file mode 100644 index 9dfb109..0000000 --- a/external/include/glm/gtx/fast_exponential.inl +++ /dev/null @@ -1,137 +0,0 @@ -/// @ref gtx_fast_exponential -/// @file glm/gtx/fast_exponential.inl - -namespace glm -{ - // fastPow: - template<typename genType> - GLM_FUNC_QUALIFIER genType fastPow(genType x, genType y) - { - return exp(y * log(x)); - } - - template<length_t L, typename T, qualifier Q> - GLM_FUNC_QUALIFIER vec<L, T, Q> fastPow(vec<L, T, Q> const& x, vec<L, T, Q> const& y) - { - return exp(y * log(x)); - } - - template<typename T> - GLM_FUNC_QUALIFIER T fastPow(T x, int y) - { - T f = static_cast<T>(1); - for(int i = 0; i < y; ++i) - f *= x; - return f; - } - - template<length_t L, typename T, qualifier Q> - GLM_FUNC_QUALIFIER vec<L, T, Q> fastPow(vec<L, T, Q> const& x, vec<L, int, Q> const& y) - { - vec<L, T, Q> Result; - for(length_t i = 0, n = x.length(); i < n; ++i) - Result[i] = fastPow(x[i], y[i]); - return Result; - } - - // fastExp - // Note: This function provides accurate results only for value between -1 and 1, else avoid it. - template<typename T> - GLM_FUNC_QUALIFIER T fastExp(T x) - { - // This has a better looking and same performance in release mode than the following code. However, in debug mode it's slower. - // return 1.0f + x * (1.0f + x * 0.5f * (1.0f + x * 0.3333333333f * (1.0f + x * 0.25 * (1.0f + x * 0.2f)))); - T x2 = x * x; - T x3 = x2 * x; - T x4 = x3 * x; - T x5 = x4 * x; - return T(1) + x + (x2 * T(0.5)) + (x3 * T(0.1666666667)) + (x4 * T(0.041666667)) + (x5 * T(0.008333333333)); - } - /* // Try to handle all values of float... but often shower than std::exp, glm::floor and the loop kill the performance - GLM_FUNC_QUALIFIER float fastExp(float x) - { - const float e = 2.718281828f; - const float IntegerPart = floor(x); - const float FloatPart = x - IntegerPart; - float z = 1.f; - - for(int i = 0; i < int(IntegerPart); ++i) - z *= e; - - const float x2 = FloatPart * FloatPart; - const float x3 = x2 * FloatPart; - const float x4 = x3 * FloatPart; - const float x5 = x4 * FloatPart; - return z * (1.0f + FloatPart + (x2 * 0.5f) + (x3 * 0.1666666667f) + (x4 * 0.041666667f) + (x5 * 0.008333333333f)); - } - - // Increase accuracy on number bigger that 1 and smaller than -1 but it's not enough for high and negative numbers - GLM_FUNC_QUALIFIER float fastExp(float x) - { - // This has a better looking and same performance in release mode than the following code. However, in debug mode it's slower. - // return 1.0f + x * (1.0f + x * 0.5f * (1.0f + x * 0.3333333333f * (1.0f + x * 0.25 * (1.0f + x * 0.2f)))); - float x2 = x * x; - float x3 = x2 * x; - float x4 = x3 * x; - float x5 = x4 * x; - float x6 = x5 * x; - float x7 = x6 * x; - float x8 = x7 * x; - return 1.0f + x + (x2 * 0.5f) + (x3 * 0.1666666667f) + (x4 * 0.041666667f) + (x5 * 0.008333333333f)+ (x6 * 0.00138888888888f) + (x7 * 0.000198412698f) + (x8 * 0.0000248015873f);; - } - */ - - template<length_t L, typename T, qualifier Q> - GLM_FUNC_QUALIFIER vec<L, T, Q> fastExp(vec<L, T, Q> const& x) - { - return detail::functor1<L, T, T, Q>::call(fastExp, x); - } - - // fastLog - template<typename genType> - GLM_FUNC_QUALIFIER genType fastLog(genType x) - { - return std::log(x); - } - - /* Slower than the VC7.1 function... - GLM_FUNC_QUALIFIER float fastLog(float x) - { - float y1 = (x - 1.0f) / (x + 1.0f); - float y2 = y1 * y1; - return 2.0f * y1 * (1.0f + y2 * (0.3333333333f + y2 * (0.2f + y2 * 0.1428571429f))); - } - */ - - template<length_t L, typename T, qualifier Q> - GLM_FUNC_QUALIFIER vec<L, T, Q> fastLog(vec<L, T, Q> const& x) - { - return detail::functor1<L, T, T, Q>::call(fastLog, x); - } - - //fastExp2, ln2 = 0.69314718055994530941723212145818f - template<typename genType> - GLM_FUNC_QUALIFIER genType fastExp2(genType x) - { - return fastExp(0.69314718055994530941723212145818f * x); - } - - template<length_t L, typename T, qualifier Q> - GLM_FUNC_QUALIFIER vec<L, T, Q> fastExp2(vec<L, T, Q> const& x) - { - return detail::functor1<L, T, T, Q>::call(fastExp2, x); - } - - // fastLog2, ln2 = 0.69314718055994530941723212145818f - template<typename genType> - GLM_FUNC_QUALIFIER genType fastLog2(genType x) - { - return fastLog(x) / 0.69314718055994530941723212145818f; - } - - template<length_t L, typename T, qualifier Q> - GLM_FUNC_QUALIFIER vec<L, T, Q> fastLog2(vec<L, T, Q> const& x) - { - return detail::functor1<L, T, T, Q>::call(fastLog2, x); - } -}//namespace glm |