add: glgfx_context_select(glgfx_monitor_getcontext(monitor));
context: void* renderer(void* _m) {  struct glgfx_monitor* monitor = _m;  while (!renderer_quit) {    glgfx_monitor_waittof(monitor);    glgfx_monitor_render(monitor);    glgfx_monitor_swapbuffers(monitor);  }  return NULL;}