Retrieves required OpenGL version set as a requirement for the this realization.
It will not change even if a greater OpenGL version is supported and used after the this is realized. See [[email protected]_version] for the real version in use.
See [[email protected]_required_version].
this |
a `GdkGLContext` |
major |
return location for the major version to request |
minor |
return location for the minor version to request |