ACE3/extensions/common/glm/detail/func_geometric.hpp

///////////////////////////////////////////////////////////////////////////////////
/// OpenGL Mathematics (glm.g-truc.net)
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/// @ref core
/// @file glm/detail/func_geometric.hpp
/// @date 2008-08-03 / 2011-06-14
/// @author Christophe Riccio
///
/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a>
/// 
/// @defgroup core_func_geometric Geometric functions
/// @ingroup core
/// 
/// These operate on vectors as vectors, not component-wise.
///////////////////////////////////////////////////////////////////////////////////

#pragma once

#include "type_vec3.hpp"

namespace glm
{
    /// @addtogroup core_func_geometric
    /// @{

    /// Returns the length of x, i.e., sqrt(x * x).
    /// 
    /// @tparam genType Floating-point vector types.
    /// 
    /// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/length.xml">GLSL length man page</a>
    /// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a>
    template <typename T, precision P, template <typename, precision> class vecType>
    GLM_FUNC_DECL T length(
        vecType<T, P> const & x);

    /// Returns the distance betwwen p0 and p1, i.e., length(p0 - p1).
    ///
    /// @tparam genType Floating-point vector types.
    /// 
    /// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/distance.xml">GLSL distance man page</a>
    /// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a>
    template <typename T, precision P, template <typename, precision> class vecType>
    GLM_FUNC_DECL T distance(
        vecType<T, P> const & p0,
        vecType<T, P> const & p1);

    /// Returns the dot product of x and y, i.e., result = x * y.
    ///
    /// @tparam genType Floating-point vector types.
    /// 
    /// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/dot.xml">GLSL dot man page</a>
    /// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a>
    template <typename T, precision P, template <typename, precision> class vecType>
    GLM_FUNC_DECL T dot(
        vecType<T, P> const & x,
        vecType<T, P> const & y);

    /// Returns the cross product of x and y.
    ///
    /// @tparam valType Floating-point scalar types.
    /// 
    /// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/cross.xml">GLSL cross man page</a>
    /// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a>
    template <typename T, precision P>
    GLM_FUNC_DECL tvec3<T, P> cross(
        tvec3<T, P> const & x,
        tvec3<T, P> const & y);

    /// Returns a vector in the same direction as x but with length of 1.
    /// According to issue 10 GLSL 1.10 specification, if length(x) == 0 then result is undefined and generate an error.
    /// 
    /// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/normalize.xml">GLSL normalize man page</a>
    /// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a>
    template <typename T, precision P, template <typename, precision> class vecType>
    GLM_FUNC_DECL vecType<T, P> normalize(
        vecType<T, P> const & x);

    /// If dot(Nref, I) < 0.0, return N, otherwise, return -N.
    ///
    /// @tparam genType Floating-point vector types.
    /// 
    /// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/faceforward.xml">GLSL faceforward man page</a>
    /// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a>
    template <typename T, precision P, template <typename, precision> class vecType>
    GLM_FUNC_DECL vecType<T, P> faceforward(
        vecType<T, P> const & N,
        vecType<T, P> const & I,
        vecType<T, P> const & Nref);

    /// For the incident vector I and surface orientation N, 
    /// returns the reflection direction : result = I - 2.0 * dot(N, I) * N.
    ///
    /// @tparam genType Floating-point vector types.
    /// 
    /// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/reflect.xml">GLSL reflect man page</a>
    /// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a>
    template <typename genType>
    GLM_FUNC_DECL genType reflect(
        genType const & I,
        genType const & N);

    /// For the incident vector I and surface normal N, 
    /// and the ratio of indices of refraction eta, 
    /// return the refraction vector.
    ///
    /// @tparam genType Floating-point vector types.
    /// 
    /// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/refract.xml">GLSL refract man page</a>
    /// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a>
    template <typename T, precision P, template <typename, precision> class vecType>
    GLM_FUNC_DECL vecType<T, P> refract(
        vecType<T, P> const & I,
        vecType<T, P> const & N,
        T eta);

    /// @}
}//namespace glm

#include "func_geometric.inl"