((function abs
   (signature float
     (parameters
       (declare (in) float arg0))
     ((return (expression float abs (var_ref arg0)))))

   (signature vec2
     (parameters
       (declare (in) vec2 arg0))
     ((return (expression vec2 abs (var_ref arg0)))))

   (signature vec3
     (parameters
       (declare (in) vec3 arg0))
     ((return (expression vec3 abs (var_ref arg0)))))

   (signature vec4
     (parameters
       (declare (in) vec4 arg0))
     ((return (expression vec4 abs (var_ref arg0)))))

   (signature int
     (parameters
       (declare (in) int arg0))
     ((return (expression int abs (var_ref arg0)))))

   (signature ivec2
     (parameters
       (declare (in) ivec2 arg0))
     ((return (expression ivec2 abs (var_ref arg0)))))

   (signature ivec3
     (parameters
       (declare (in) ivec3 arg0))
     ((return (expression ivec3 abs (var_ref arg0)))))

   (signature ivec4
     (parameters
       (declare (in) ivec4 arg0))
     ((return (expression ivec4 abs (var_ref arg0)))))
))