text: #pragma once
  
  namespace gpx
  {
  
  struct window_desc;
  struct runtime_desc;
  struct pipeline_desc;
  struct shader_desc;
  struct vertices_viewer_desc;
  struct texture_viewer_desc;
  struct dynamic_memory_desc;
  
  class window;
  class runtime;
  class pipeline;
  class shader;
  class vertices_viewer;
  class texture_viewer;
  class dynamic_memory;
  
  }
  