# ☄️ Comet
a free and open source games framework

> [!WARNING]
> This project is in early development and is not yet ready for use.
> 
> It could be potentially used to make something very basic in a very hacky way, but it is not a good experience.
> 
> Installation is manual as of right now but if it reaches an acceptable state I will publish the crate.
>
> There is a plan for a project creation tool that will automate the project setup process.

## Recommended setup

The project structure should look like this:

```
project
│   Cargo.toml
│   build.rs
│   crates
│   └── comet
│   resources
│   └── shaders
│   └── textures
│   src
│   └── main.rs
```

```toml
# Cargo.toml 
# ...
[dependencies]
comet = { path = "path/of/the/comet/crate" }  
# ...
```

```rust
// main.rs example 
use comet::prelude::*;

struct GameState {}

impl GameState {
    pub fn new() -> Self {
      Self {}
    }
}

// This function will be called once before the event loop starts
fn setup(app: &mut App, renderer: &mut Renderer2D) {}
// This function will be called every tick 
fn update(app: &mut App, renderer: &mut Renderer2D, dt: f32) {}

fn main() { 
    App::new() // Generate a basic 2D app
        .with_preset(App2D) // Pre-registers the `Transform2D` component in the scene
        .with_title("Comet App") // Sets the window title
        .with_icon(r"resources/textures/comet_icon.png") // Sets the window icon
        .with_size(1920, 1080) // Sets the window size
        .with_game_state(GameState::new()) // Adds a custom game state struct
        .run::<Renderer2D>(setup, update) // Starts app with the given 
}
```

```rust
// build.rs example

use anyhow::*;
use fs_extra::copy_items;
use fs_extra::dir::CopyOptions;
use std::env;

fn main() -> Result<()> {
    println!("cargo:rerun-if-changed=resources/textures/*");
    println!("cargo:rerun-if-changed=resources/shaders/*");

    let out_dir = env::var("OUT_DIR")?;
    let mut copy_options = CopyOptions::new();
    copy_options.overwrite = true;
    let mut paths_to_copy = Vec::new();
    paths_to_copy.push("resources/textures/");
    paths_to_copy.push("resources/shaders/");

    copy_items(&paths_to_copy, out_dir, &copy_options)?;

    Ok(())
}
```

## Todo
(not ordered by importance)

- [ ] (out of the box) Rendering
  - [ ] 2D
    - [x] texture rendering
    - [x] scene rendering
    - [ ] text rendering
  - [ ] 3D
  - [ ] flexible camera system
    - [x] 2D
      - [x] general Camera2D component
      - [x] priority system
    - [ ] 3D
      - [ ] general Camera3D component
      - [ ] priority system
  - [ ] Particles
  - [ ] Post-processing
- [ ] Math
  - [x] Vectors
  - [x] Matrices
  - [ ] Quaternions
  - [x] Interpolation
  - [ ] Bezier curves
  - [x] Easing functions
  - [ ] Noise
  - [ ] Ray-casting
  - [ ] Pathfinding
- [ ] ECS
  - [x] Components
  - [x] Entities
  - [x] Archetypes
  - [ ] Scene
    - [x] general management
    - [ ] saving
    - [ ] loading
- [ ] Input
- [ ] Sound
- [ ] Physics
- [x] Basic Plugin System
  - [x] Custom Renderer
  - [x] Custom Game State