Added GTC_functions extension

glm/gtc/functions.hpp

@@ -0,0 +1,53 @@
+/// @ref gtc_functions
+/// @file glm/gtc/functions.hpp
+/// 
+/// @see core (dependence)
+/// @see gtc_half_float (dependence)
+/// @see gtc_quaternion (dependence)
+///
+/// @defgroup gtc_functions GLM_GTC_functions
+/// @ingroup gtc
+/// 
+/// @brief List of useful common functions.
+/// 
+/// <glm/gtc/functions.hpp> need to be included to use these functionalities.
+
+#pragma once
+
+// Dependencies
+#include "../detail/setup.hpp"
+#include "../detail/precision.hpp"
+#include "../detail/type_vec2.hpp"
+
+#if(defined(GLM_MESSAGES) && !defined(GLM_EXT_INCLUDED))
+#	pragma message("GLM: GLM_GTC_functions extension included")
+#endif
+
+namespace glm
+{
+	/// @addtogroup gtc_functions
+	/// @{
+
+	/// 1D gauss function
+	///
+	/// @see gtc_epsilon
+	template <typename T>
+	GLM_FUNC_DECL T gauss(
+		T x,
+		T ExpectedValue,
+		T StandardDeviation);
+
+	/// 2D gauss function
+	///
+	/// @see gtc_epsilon
+	template <typename T, precision P>
+	GLM_FUNC_DECL T gauss(
+		tvec2<T, P> const& Coord,
+		tvec2<T, P> const& ExpectedValue,
+		tvec2<T, P> const& StandardDeviation);
+
+	/// @}
+}//namespace glm
+
+#include "functions.inl"
+

glm/gtc/functions.inl

@@ -0,0 +1,31 @@
+/// @ref gtc_functions
+/// @file glm/gtc/functions.inl
+
+#include "../detail/func_exponential.hpp"
+
+namespace glm
+{
+	template <typename T>
+	GLM_FUNC_QUALIFIER T gauss
+	(
+		T x,
+		T ExpectedValue,
+		T StandardDeviation
+	)
+	{
+		return exp(-((x - ExpectedValue) * (x - ExpectedValue)) / (static_cast<T>(2) * StandardDeviation * StandardDeviation)) / (StandardDeviation * sqrt(static_cast<T>(6.28318530717958647692528676655900576)));
+	}
+
+	template <typename T, precision P>
+	GLM_FUNC_QUALIFIER T gauss
+	(
+		tvec2<T, P> const& Coord,
+		tvec2<T, P> const& ExpectedValue,
+		tvec2<T, P> const& StandardDeviation
+	)
+	{
+		tvec2<T, P> const Squared = ((Coord - ExpectedValue) * (Coord - ExpectedValue)) / (static_cast<T>(2) * StandardDeviation * StandardDeviation);
+		return exp(-(Squared.x + Squared.y));
+	}
+}//namespace glm
+

readme.md

@@ -65,6 +65,7 @@ glm::mat4 camera(float Translate, glm::vec2 const & Rotate)
 - Added raw SIMD API
 - Added 'aligned' qualifiers
 - Added GTC_type_aligned with aligned *vec* types
+- Added GTC_functions extension
 
 ##### Improvements:
 - Improved SIMD and swizzle operators interactions with GCC and Clang #474

test/gtc/CMakeLists.txt

@@ -2,6 +2,7 @@ glmCreateTestGTC(gtc_bitfield)
 glmCreateTestGTC(gtc_color_space)
 glmCreateTestGTC(gtc_constants)
 glmCreateTestGTC(gtc_epsilon)
+glmCreateTestGTC(gtc_functions)
 glmCreateTestGTC(gtc_integer)
 glmCreateTestGTC(gtc_matrix_access)
 glmCreateTestGTC(gtc_matrix_integer)

test/gtc/gtc_functions.cpp

@@ -0,0 +1,35 @@
+#include <glm/gtc/functions.hpp>
+#include <vector>
+
+int test_gauss_1d()
+{
+	int Error = 0;
+
+	std::vector<float> Result(20);
+	for(std::size_t i = 0, n = Result.size(); i < n; ++i)
+		Result[i] = glm::gauss(static_cast<float>(i) * 0.1f, 0.0f, 1.0f);
+
+	return Error;
+}
+
+int test_gauss_2d()
+{
+	int Error = 0;
+
+	std::vector<float> Result(20);
+	for(std::size_t i = 0, n = Result.size(); i < n; ++i)
+		Result[i] = glm::gauss(glm::vec2(i) * 0.1f, glm::vec2(0.0f), glm::vec2(1.0f));
+
+	return Error;
+}
+
+int main()
+{
+	int Error = 0;
+
+	Error += test_gauss_1d();
+	Error += test_gauss_2d();
+
+	return Error;
+}
+