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Promote and deprecate extensions

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This commit is contained in:
Christophe Riccio 2012-01-10 20:43:20 +00:00
parent c26057d07b
commit 9a394874c3
8 changed files with 163 additions and 229 deletions
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121
glm/gtc/reciprocal.hpp Normal file
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@ -0,0 +1,121 @@
///////////////////////////////////////////////////////////////////////////////////
/// OpenGL Mathematics (glm.g-truc.net)
///
/// Copyright (c) 2005 - 2012 G-Truc Creation (www.g-truc.net)
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.
///
/// @ref gtx_reciprocal
/// @file glm/gtx/reciprocal.hpp
/// @date 2008-10-09 / 2011-06-07
/// @author Christophe Riccio
///
/// @see core (dependence)
///
/// @defgroup gtx_reciprocal GLM_GTX_reciprocal: Reciprocal
/// @ingroup gtx
///
/// @brief Define secant, cosecant and cotangent functions.
///
/// <glm/gtx/reciprocal.hpp> need to be included to use these functionalities.
///////////////////////////////////////////////////////////////////////////////////
#ifndef GLM_GTX_reciprocal
#define GLM_GTX_reciprocal GLM_VERSION
// Dependency:
#include "../glm.hpp"
#if(defined(GLM_MESSAGES) && !defined(glm_ext))
# pragma message("GLM: GLM_GTX_reciprocal extension included")
#endif
namespace glm
{
/// @addtogroup gtx_reciprocal
/// @{
//! Secant function.
//! hypotenuse / adjacent or 1 / cos(x)
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType sec(genType const & angle);
//! Cosecant function.
//! hypotenuse / opposite or 1 / sin(x)
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType csc(genType const & angle);
//! Cotangent function.
//! adjacent / opposite or 1 / tan(x)
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType cot(genType const & angle);
//! Inverse secant function.
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType asec(genType const & x);
//! Inverse cosecant function.
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType acsc(genType const & x);
//! Inverse cotangent function.
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType acot(genType const & x);
//! Secant hyperbolic function.
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType sech(genType const & angle);
//! Cosecant hyperbolic function.
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType csch(genType const & angle);
//! Cotangent hyperbolic function.
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType coth(genType const & angle);
//! Inverse secant hyperbolic function.
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType asech(genType const & x);
//! Inverse cosecant hyperbolic function.
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType acsch(genType const & x);
//! Inverse cotangent hyperbolic function.
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType acoth(genType const & x);
/// @}
}//namespace glm
#include "reciprocal.inl"
#endif//GLM_GTX_reciprocal

0
glm/gtx/reciprocal.inl → glm/gtc/reciprocal.inl
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8
glm/gtx/bit.hpp
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@ -61,7 +61,7 @@ namespace glm
/// genType and genIType could be a scalar or a vector. /// genType and genIType could be a scalar or a vector.
/// @see gtx_bit /// @see gtx_bit
template <typename genIUType, typename sizeType> template <typename genIUType, typename sizeType>
genIUType extractField( GLM_DEPRECATED genIUType extractField(
genIUType const & v, genIUType const & v,
sizeType const & first, sizeType const & first,
sizeType const & count); sizeType const & count);
@ -69,12 +69,12 @@ namespace glm
//! Find the lowest bit set to 1 in a integer variable. //! Find the lowest bit set to 1 in a integer variable.
/// @see gtx_bit /// @see gtx_bit
template <typename genType> template <typename genType>
int lowestBit(genType const & value); GLM_DEPRECATED int lowestBit(genType const & value);
//! Find the highest bit set to 1 in a integer variable. //! Find the highest bit set to 1 in a integer variable.
/// @see gtx_bit /// @see gtx_bit
template <typename genType> template <typename genType>
int highestBit(genType const & value); GLM_DEPRECATED int highestBit(genType const & value);
//! Find the highest bit set to 1 in a integer variable and return its value. //! Find the highest bit set to 1 in a integer variable and return its value.
/// @see gtx_bit /// @see gtx_bit
@ -104,7 +104,7 @@ namespace glm
//! Revert all bits of any integer based type. //! Revert all bits of any integer based type.
/// @see gtx_bit /// @see gtx_bit
template <typename genType> template <typename genType>
genType bitRevert(genType const & value); GLM_DEPRECATED genType bitRevert(genType const & value);
//! Rotate all bits to the right. //! Rotate all bits to the right.
/// @see gtx_bit /// @see gtx_bit

41
glm/gtx/noise.hpp
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@ -19,45 +19,8 @@
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, /// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN /// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE. /// THE SOFTWARE.
///
/// @ref gtx_noise
/// @file glm/gtx/noise.hpp
/// @date 2011-04-21 / 2011-06-07
/// @author Christophe Riccio
///
/// @see core (dependence)
///
/// @defgroup gtx_noise GLM_GTX_noise: Procedural noise functions
/// @ingroup gtx
///
/// Defines 2D, 3D and 4D procedural noise functions
/// Based on the work of Stefan Gustavson and Ashima Arts on "webgl-noise":
/// https://github.com/ashima/webgl-noise
/// Following Stefan Gustavson's paper "Simplex noise demystified":
/// http://www.itn.liu.se/~stegu/simplexnoise/simplexnoise.pdf
/// Defines the half-precision floating-point type, along with various typedefs for vectors and matrices.
/// <glm/gtx/noise.hpp> need to be included to use these functionalities.
/////////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////////
#ifndef GLM_GTX_noise #if(defined(GLM_MESSAGES))
#define GLM_GTX_noise GLM_VERSION # pragma message("GLM: GLM_GTX_random extension is deprecated, include GLM_GTC_random instead")
// Dependency:
#include "../glm.hpp"
#include "../gtc/noise.hpp"
#if(defined(GLM_MESSAGES) && !defined(glm_ext))
# pragma message("GLM: GLM_GTX_noise extension included")
#endif #endif
namespace glm
{
/// @addtogroup gtx_noise
/// @{
/// @}
}//namespace glm
#include "noise.inl"
#endif//glm_gtx_noise

85
glm/gtx/random.hpp
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@ -19,89 +19,8 @@
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, /// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN /// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE. /// THE SOFTWARE.
///
/// @ref gtx_random
/// @file glm/gtx/random.hpp
/// @date 2006-01-16 / 2011-06-07
/// @author Christophe Riccio
///
/// @see core (dependence)
/// @see gtc_half_float (dependence)
///
/// @defgroup gtx_random GLM_GTX_random: Random
/// @ingroup gtx
///
/// @brief Generate random number from various distribution methods
///
/// <glm/gtx/random.hpp> need to be included to use these functionalities.
/////////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////////
#ifndef GLM_GTX_random #if(defined(GLM_MESSAGES))
#define GLM_GTX_random GLM_VERSION # pragma message("GLM: GLM_GTX_random extension is deprecated, include GLM_GTC_random instead")
// Dependency:
#include "../glm.hpp"
#include "../gtc/random.hpp"
#if(defined(GLM_MESSAGES) && !defined(glm_ext))
# pragma message("GLM: GLM_GTX_random extension included")
#endif #endif
namespace glm
{
/// @addtogroup gtx_random
/// @{
/// Generate a random number in the interval [-1, 1], according a linear distribution.
/// From GLM_GTX_random extension.
template <typename T> T signedRand1();
template <> float signedRand1(); //!< \brief Generate a random number in the interval [-1, 1], according a linear distribution (From GLM_GTX_random extension)
template <> double signedRand1(); //!< \brief Generate a random number in the interval [-1, 1], according a linear distribution (From GLM_GTX_random extension)
template <typename T> detail::tvec2<T> signedRand2(); //!< \brief Generate 2 random numbers in the interval [-1, 1], according a linear distribution (From GLM_GTX_random extension)
template <typename T> detail::tvec3<T> signedRand3(); //!< \brief Generate 3 random numbers in the interval [-1, 1], according a linear distribution (From GLM_GTX_random extension)
template <typename T> detail::tvec4<T> signedRand4(); //!< \brief Generate 4 random numbers in the interval [-1, 1], according a linear distribution (From GLM_GTX_random extension)
template <typename T> detail::tvec2<T> normalizedRand2(); //!< \brief Generate a normalized 2D vector regulary distribute on a circle (From GLM_GTX_random extension)
template <typename T> detail::tvec2<T> normalizedRand2(T Min, T Max); //!< \brief Generate a scaled and normalized 2D vector regulary distribute on a circle (From GLM_GTX_random extension)
template <typename T> detail::tvec3<T> normalizedRand3(); //!< \brief Generate a normalized 3D vector regulary distribute on a sphere (From GLM_GTX_random extension)
template <typename T> detail::tvec3<T> normalizedRand3(T Min, T Max); //!< \brief Generate a scaled and normalized 3D vector regulary distribute on a sphere (From GLM_GTX_random extension)
template <typename T> T compRand1(); //!< \brief Generate a random number in the interval [0, 1], according a linear distribution (From GLM_GTX_random extension)
template <> float compRand1(); //!< \brief Generate a random number in the interval [0, 1], according a linear distribution (From GLM_GTX_random extension)
template <> double compRand1(); //!< \brief Generate a random number in the interval [0, 1], according a linear distribution (From GLM_GTX_random extension)
template <typename T> T compRand1(T Min, T Max); //!< \brief Generate a random number in the interval [Min, Max], according a linear distribution (From GLM_GTX_random extension)
template <typename T> detail::tvec2<T> compRand2(T Min, T Max); //!< \brief Generate 2 random numbers in the interval [Min, Max], according a linear distribution (From GLM_GTX_random extension)
template <typename T> detail::tvec3<T> compRand3(T Min, T Max); //!< \brief Generate 3 random numbers in the interval [Min, Max], according a linear distribution (From GLM_GTX_random extension)
template <typename T> detail::tvec4<T> compRand4(T Min, T Max); //!< \brief Generate 4 random numbers in the interval [Min, Max], according a linear distribution (From GLM_GTX_random extension)
template <typename T> detail::tvec2<T> compRand2(const detail::tvec2<T>& Min, const detail::tvec2<T>& Max); //!< \brief Generate 2 random numbers in the interval [Min, Max], according a linear distribution (From GLM_GTX_random extension)
template <typename T> detail::tvec3<T> compRand3(const detail::tvec3<T>& Min, const detail::tvec3<T>& Max); //!< \brief Generate 3 random numbers in the interval [Min, Max], according a linear distribution (From GLM_GTX_random extension)
template <typename T> detail::tvec3<T> compRand4(const detail::tvec4<T>& Min, const detail::tvec4<T>& Max); //!< \brief Generate 4 random numbers in the interval [Min, Max], according a linear distribution (From GLM_GTX_random extension)
template <typename T> detail::tvec2<T> vecRand2(); //!< \brief Generate a random normalized 2 component vector. It's a spherical uniform distribution. (From GLM_GTX_random extension)
template <typename T> detail::tvec2<T> vecRand2(T MinRadius, T MaxRadius); //!< \brief Generate a random normalized 2 component vector. It's a spherical uniform distribution. (From GLM_GTX_random extension)
template <typename T> detail::tvec3<T> vecRand3(); //!< \brief Generate a random normalized 3 component vector. It's a spherical uniform distribution. (From GLM_GTX_random extension)
template <typename T> detail::tvec3<T> vecRand3(T MinRadius, T MaxRadius); //!< \brief Generate a random normalized 3 component vector. It's a spherical uniform distribution. (From GLM_GTX_random extension)
template <typename T> detail::tvec4<T> vecRand4(); //!< \brief Generate a random normalized 4 component vector. It's a spherical uniform distribution. (From GLM_GTX_random extension)
template <typename T> detail::tvec4<T> vecRand4(T MinRadius, T MaxRadius); //!< \brief Generate a random normalized 4 component vector. It's a spherical uniform distribution. (From GLM_GTX_random extension)
template <typename T> T gaussRand1(T mean, T std_deviation); //!< \brief Gererate a random floating number according a Gauss distribution. (From GLM_GTX_random extension)
template <typename T> detail::tvec2<T> gaussRand2(T mean, T std_deviation); //!< \brief Gererate 2 random floating numbers according a Gauss distribution. (From GLM_GTX_random extension)
template <typename T> detail::tvec3<T> gaussRand3(T mean, T std_deviation); //!< \brief Gererate 3 random floating numbers according a Gauss distribution. (From GLM_GTX_random extension)
template <typename T> detail::tvec4<T> gaussRand4(T mean, T std_deviation); //!< \brief Gererate 4 random floating numbers according a Gauss distribution. (From GLM_GTX_random extension)
template <typename T> detail::tvec2<T> gaussRand2(const detail::tvec2<T>& mean, T std_deviation); //!< \brief Gererate 2 random floating numbers according a Gauss distribution. (From GLM_GTX_random extension)
template <typename T> detail::tvec3<T> gaussRand3(const detail::tvec3<T>& mean, T std_deviation); //!< \brief Gererate 3 random floating numbers according a Gauss distribution. (From GLM_GTX_random extension)
template <typename T> detail::tvec4<T> gaussRand4(const detail::tvec4<T>& mean, T std_deviation); //!< \brief Gererate 4 random floating numbers according a Gauss distribution. (From GLM_GTX_random extension)
template <typename T> detail::tvec2<T> gaussRand2(T mean, const detail::tvec2<T>& std_deviation); //!< \brief Gererate 2 random floating numbers according a Gauss distribution. (From GLM_GTX_random extension)
template <typename T> detail::tvec3<T> gaussRand3(T mean, const detail::tvec3<T>& std_deviation); //!< \brief Gererate 3 random floating numbers according a Gauss distribution. (From GLM_GTX_random extension)
template <typename T> detail::tvec4<T> gaussRand4(T mean, const detail::tvec4<T>& std_deviation); //!< \brief Gererate 4 random floating numbers according a Gauss distribution. (From GLM_GTX_random extension)
template <typename T> detail::tvec2<T> gaussRand2(const detail::tvec2<T>& mean, const detail::tvec2<T>& std_deviation); //!< \brief Gererate 2 random floating numbers according a Gauss distribution. (From GLM_GTX_random extension)
template <typename T> detail::tvec3<T> gaussRand3(const detail::tvec3<T>& mean, const detail::tvec3<T>& std_deviation); //!< \brief Gererate 3 random floating numbers according a Gauss distribution. (From GLM_GTX_random extension)
template <typename T> detail::tvec4<T> gaussRand4(const detail::tvec4<T>& mean, const detail::tvec4<T>& std_deviation); //!< \brief Gererate 4 random floating numbers according a Gauss distribution. (From GLM_GTX_random extension)
/// @}
}//namespace glm
#include "random.inl"
#endif//GLM_GTX_random

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glm/gtx/reciprocal.hpp
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@ -19,103 +19,8 @@
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, /// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN /// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE. /// THE SOFTWARE.
///
/// @ref gtx_reciprocal
/// @file glm/gtx/reciprocal.hpp
/// @date 2008-10-09 / 2011-06-07
/// @author Christophe Riccio
///
/// @see core (dependence)
///
/// @defgroup gtx_reciprocal GLM_GTX_reciprocal: Reciprocal
/// @ingroup gtx
///
/// @brief Define secant, cosecant and cotangent functions.
///
/// <glm/gtx/reciprocal.hpp> need to be included to use these functionalities.
/////////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////////
#ifndef GLM_GTX_reciprocal #if(defined(GLM_MESSAGES))
#define GLM_GTX_reciprocal GLM_VERSION # pragma message("GLM: GLM_GTX_reciprocal extension is deprecated, include GLM_GTC_reciprocal instead")
// Dependency:
#include "../glm.hpp"
#if(defined(GLM_MESSAGES) && !defined(glm_ext))
# pragma message("GLM: GLM_GTX_reciprocal extension included")
#endif #endif
namespace glm
{
/// @addtogroup gtx_reciprocal
/// @{
//! Secant function.
//! hypotenuse / adjacent or 1 / cos(x)
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType sec(genType const & angle);
//! Cosecant function.
//! hypotenuse / opposite or 1 / sin(x)
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType csc(genType const & angle);
//! Cotangent function.
//! adjacent / opposite or 1 / tan(x)
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType cot(genType const & angle);
//! Inverse secant function.
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType asec(genType const & x);
//! Inverse cosecant function.
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType acsc(genType const & x);
//! Inverse cotangent function.
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType acot(genType const & x);
//! Secant hyperbolic function.
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType sech(genType const & angle);
//! Cosecant hyperbolic function.
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType csch(genType const & angle);
//! Cotangent hyperbolic function.
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType coth(genType const & angle);
//! Inverse secant hyperbolic function.
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType asech(genType const & x);
//! Inverse cosecant hyperbolic function.
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType acsch(genType const & x);
//! Inverse cotangent hyperbolic function.
//! From GLM_GTX_reciprocal extension.
template <typename genType>
genType acoth(genType const & x);
/// @}
}//namespace glm
#include "reciprocal.inl"
#endif//GLM_GTX_reciprocal

12
glm/gtx/std_based_type.hpp
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@ -52,27 +52,27 @@ namespace glm
/// @{ /// @{
/// Vector type based of two std::size_t components. /// Vector type based of two std::size_t components.
/// @see - GLM_GTX_std_based_type /// @see GLM_GTX_std_based_type
typedef detail::tvec2<std::size_t> size2; typedef detail::tvec2<std::size_t> size2;
/// Vector type based of three std::size_t components. /// Vector type based of three std::size_t components.
/// @see - GLM_GTX_std_based_type /// @see GLM_GTX_std_based_type
typedef detail::tvec3<std::size_t> size3; typedef detail::tvec3<std::size_t> size3;
/// Vector type based of four std::size_t components. /// Vector type based of four std::size_t components.
/// @see - GLM_GTX_std_based_type /// @see GLM_GTX_std_based_type
typedef detail::tvec4<std::size_t> size4; typedef detail::tvec4<std::size_t> size4;
/// Vector type based of two std::size_t components. /// Vector type based of two std::size_t components.
/// @see - GLM_GTX_std_based_type /// @see GLM_GTX_std_based_type
typedef detail::tvec2<std::size_t> size2_t; typedef detail::tvec2<std::size_t> size2_t;
/// Vector type based of three std::size_t components. /// Vector type based of three std::size_t components.
/// @see - GLM_GTX_std_based_type /// @see GLM_GTX_std_based_type
typedef detail::tvec3<std::size_t> size3_t; typedef detail::tvec3<std::size_t> size3_t;
/// Vector type based of four std::size_t components. /// Vector type based of four std::size_t components.
/// @see - GLM_GTX_std_based_type /// @see GLM_GTX_std_based_type
typedef detail::tvec4<std::size_t> size4_t; typedef detail::tvec4<std::size_t> size4_t;
/// @} /// @}

26
glm/gtx/ulp.hpp Normal file
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@ -0,0 +1,26 @@
///////////////////////////////////////////////////////////////////////////////////
/// OpenGL Mathematics (glm.g-truc.net)
///
/// Copyright (c) 2005 - 2012 G-Truc Creation (www.g-truc.net)
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.
///////////////////////////////////////////////////////////////////////////////////
#if(defined(GLM_MESSAGES))
# pragma message("GLM: GLM_GTX_ulp extension is deprecated, include GLM_GTC_ulp instead")
#endif