# Lyra ECS
An ECS for the Lyra game engine.

## Why does it exist?
I couldn't find anything that fulfilled my needs, specifically an ECS that can store arbitrary components without knowing about the types. This makes it easier to implement into a scripting engine that has the ability to create its own components.

## Features
- [x] Archetypes
  - [x] Spawning entities
  - [x] Despawning entities
    - [x] Delete entities from archetypes
    - [x] Find some way to fill in the gaps in component columns after entities are deleted
      * This was done by moving the last entity in the column to the gap that was just removed.
  - [x] Grow archetype as it fills up
  - [x] Borrow safety of components inside Archetypes
    - [x] Return `Ref` and `RefMut` from borrow queries
- [x] Querying components from archetypes
  - [x] Views
  - [x] Mutable views
- [x] Resources
- [x] Get resources in views somehow
- [ ] Relationships (maybe this can be done through queries, idk)
- [x] Dynamic queries
    * Needed for scripting engines that can create their own components that Rust does not know the types of.
- [x] Systems
  - [x] Dispatchers/Executors
    - [x] Execution graph that follows dependencies
- [ ] Track when components on entities are changed