5 #include "../detail/setup.hpp" 
    6 #include "../detail/type_vec4.hpp" 
vec< 4, double, mediump > mediump_dvec4
4 components vector of medium double-qualifier floating-point numbers. 
vec< 4, double, highp > highp_dvec4
4 components vector of high double-qualifier floating-point numbers. 
vec< 4, double, lowp > lowp_dvec4
4 components vector of low double-qualifier floating-point numbers.