/ - base engine class, config, include 
  base/ - shader and program compilators, texture class
  buffer/ - buffers e.g framebuffers
  camera/ - classes of cameras 
  renderable/ - everything what you can render
  scene/ - scene class
  support/ - supporting files
  texture-generator/ - noise, heightmap, normalmap generators
  window/ - window class
  shaders/ - proposed shaders