0.9.9/api/a00287_source.html

 #pragma once
 #include "../detail/type_vec2.hpp"

 namespace glm
 {

     typedef vec<2, double, highp>       highp_dvec2;

     typedef vec<2, double, mediump>     mediump_dvec2;

     typedef vec<2, double, lowp>        lowp_dvec2;

 }//namespace glm
glm::mediump_dvec2
vec< 2, double, mediump > mediump_dvec2
2 components vector of medium double-qualifier floating-point numbers.
Definition: vector_double2_precision.hpp:22

glm::lowp_dvec2
vec< 2, double, lowp > lowp_dvec2
2 components vector of low double-qualifier floating-point numbers.
Definition: vector_double2_precision.hpp:28

glm::highp_dvec2
vec< 2, double, highp > highp_dvec2
2 components vector of high double-qualifier floating-point numbers.
Definition: vector_double2_precision.hpp:16

glm
Definition: common.hpp:20