## Why?

- You want to make a suggestion on something that could be improved.
- You want to report a bug, something that doesn't work as expected.
- You know of a sick 6502 assembly technique that could be applied.

I am open for discussion and welcome any help!

## How?

[Like this](https://jo.mssola.com/en/contributing.html).

## Tooling

In general, rely on `make deps` to tell you what you need for development. Other
than that, if you are typing code, follow [this code
style](https://git.mssola.com/nes/style.nes). It's what I'm trying to follow
here and it plays well with the tooling I have on
[tools.nes](https://git.mssola.com/nes/tools.nes).

## Development cycle

In order to test your changes, I'd go this way:

1. Make sure that you have the toolchain installed. For this you can call `make
   deps` and it will error out if you are missing anything.
2. Make your changes in the code and run `make`. This will produce the ROM
   inside of the `out` directory.
3. Run the ROM that was produced with an emulator of your choosing. Make sure
   that things run as expected.

### Customizing the build process

You can pass the following arguments to `make`:

- `CC65`: the compiler to use (defaults to
  [xa65](https://git.mssola.com/nes/tools.nes) if that exists, otherwise
  `cl65`).
- `CCOPTS`: the options to use for the compiler (defaults to `--target nes` and
  it adds `--strict` if using `xa65`).
- `RUBY`: the ruby to use (defaults to `ruby`).

## Modifying assets

I am using [NEXXT studio 3](https://frankengraphics.itch.io/nexxt) for managing
the assets. This is why you will find a [sessions.nss](./assets/sessions.nss)
file from which you will be able to load the same environment I have been using
in order to manage my assets. All of that being said, whenever you are done
modifying the assets, do the following:

1. Save the session so it can be viewed on Git.
2. Save the 8KB of pattern data from sets A+B and save them into
   [./assets/jetpac.chr](./assets/jetpac.chr).
3. Save both screens into `.nam` files, as you can see on [./assets](./assets).