0.5.0/api/a00029_source.html

 #ifndef GLI_OPERATOR_INCLUDED

 #define GLI_OPERATOR_INCLUDED


 #include "texture2d.hpp"


 namespace gli{

 namespace detail

 {


 }//namespace detail


         texture2D operator+(texture2D const & TextureA, texture2D const & TextureB);

         texture2D operator-(texture2D const & TextureA, texture2D const & TextureB);


 }//namespace gli


 #include "operator.inl"


 #endif//GLI_OPERATOR_INCLUDED

texture2d.hpp
OpenGL Image (gli.g-truc.net)

gli::operator+
texture2D operator+(texture2D const &TextureA, texture2D const &TextureB)

gli::operator-
texture2D operator-(texture2D const &TextureA, texture2D const &TextureB)