///////////////////////////////////////////////////////////////////////////////////
/// OpenGL Mathematics (glm.g-truc.net)
///
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/// all copies or substantial portions of the Software.
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/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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///
/// @ref gtc_constants
/// @file glm/gtc/constants.hpp
/// @date 2011-09-30 / 2012-01-25
/// @author Christophe Riccio
///
/// @see core (dependence)
/// @see gtc_half_float (dependence)
///
/// @defgroup gtc_constants GLM_GTC_constants
/// @ingroup gtc
///
/// @brief Provide a list of constants and precomputed useful values.
///
/// <glm/gtc/constants.hpp> need to be included to use these features.
///////////////////////////////////////////////////////////////////////////////////

#pragma once

// Dependencies
#include "../detail/setup.hpp"

#if(defined(GLM_MESSAGES) && !defined(GLM_EXT_INCLUDED))
#       pragma message("GLM: GLM_GTC_constants extension included")
#endif

namespace glm
{
        /// @addtogroup gtc_constants
        /// @{

        /// Return the epsilon constant for floating point types.
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType epsilon();

        /// Return 0.
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType zero();

        /// Return 1.
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType one();

        /// Return the pi constant.
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType pi();

        /// Return pi * 2.
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType two_pi();

        /// Return square root of pi.
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType root_pi();

        /// Return pi / 2.
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType half_pi();

        /// Return pi / 2 * 3.
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType three_over_two_pi();

        /// Return pi / 4.
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType quarter_pi();

        /// Return 1 / pi.
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType one_over_pi();

        /// Return 1 / (pi * 2).
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType one_over_two_pi();

        /// Return 2 / pi.
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType two_over_pi();

        /// Return 4 / pi.
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType four_over_pi();

        /// Return 2 / sqrt(pi).
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType two_over_root_pi();

        /// Return 1 / sqrt(2).
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType one_over_root_two();

        /// Return sqrt(pi / 2).
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType root_half_pi();

        /// Return sqrt(2 * pi).
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType root_two_pi();

        /// Return sqrt(ln(4)).
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType root_ln_four();

        /// Return e constant.
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType e();

        /// Return Euler's constant.
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType euler();

        /// Return sqrt(2).
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType root_two();

        /// Return sqrt(3).
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType root_three();

        /// Return sqrt(5).
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType root_five();

        /// Return ln(2).
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType ln_two();

        /// Return ln(10).
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType ln_ten();

        /// Return ln(ln(2)).
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType ln_ln_two();

        /// Return 1 / 3.
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType third();

        /// Return 2 / 3.
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType two_thirds();

        /// Return the golden ratio constant.
        /// @see gtc_constants
        template <typename genType>
        GLM_FUNC_DECL genType golden_ratio();

        /// @}
} //namespace glm

#include "constants.inl"