more ideas on what to try out

- [x] post processing
- [x] UI rendering
- [ ] DirectX
- [x] compute shaders
- [ ] mini game
- [ ] ImGui?
- [ ] extending SDL_gpu?
  - [ ] access to the underlying Vulkan types
- [ ] check out the Vulkan calls generated
  - are they correct? (synchronisation, image transitions, etc.)
  - are they good? (performance wise)