Type Definition glu_sys::glu::PFNGLMAPVERTEXATTRIB1DAPPLEPROC

type PFNGLMAPVERTEXATTRIB1DAPPLEPROC = Option<unsafe extern "C" fn(index: GLuint, size: GLuint, u1: GLdouble, u2: GLdouble, stride: GLint, order: GLint, points: *const GLdouble)>;