react-gbajs

GBA emulator on your React project - easy and powerful to use!

Just three steps to set it up ✨

1 - Apply GbaProvider

import { GbaProvider } from 'react-gbajs'

const App = () => (
  <GbaProvider>
    ...
  </GbaProvider>
)

2 - Get play function from GbaContext and call it with the game ROM

import { useContext } from 'react'
import { GbaContext } from 'react-gbajs'

const ButtonStartEmulator = () => {
  const {
    play,
  } = useContext(GbaContext)

  const startEmulator = () => {
    const gameRom = getGameRom()
    play({ newRomBuffer: gameRom })
  }

  return (
    <button onClick={() => startEmulator()}>
      Start Emulator
    </button>
  )
}

3 - And render the emulator using the default export

import ReactGbaJs from 'react-gbajs'

const Emulator = () => (
  <ReactGbaJs />
)

Done! 🎉
Check a full example in /sample.

How it works

This package is a React wrapper for GBA.js.

GBA.js is vendored, with new features over the original version:

• save and restore state
• freeze address with a given value

Who is using

klo-gba.js, level editor for Klonoa: Empire of Dreams

Add your project here

Features

GbaContext

GbaContext exports the following properties:

play({ newRomBuffer, restoreState }): boolean

Use this function to start or restart the emulator.

Pass at newRomBuffer the game's ROM to load it:

play({ newRomBuffer: myGameRom })

You can also fill the property restoreState to restore to a previous state saved using saveState. If both are present, the emulator will be reset loading the ROM, and then restored to the given state:

play({ newRomBuffer: myGameRom, restoreState: someState })

If you pass only restoreState, the previous ROM will be re-loaded and will start on the given state. If there is no ROM previously loaded, it won't work.

play({ restoreState: someState })

saveState()

Return the serializable state of the emulator.

addFreezeAddress({ address: number, size: 8 | 16 | 32, value: number })

Freeze an address with the given value.

removeFreezeAddress(address: number)

Remove the freeze value on the given address.

frozenAddresses()

Return the list of the addresses frozen in the following format:

{
  [address in number]: { size: 8 | 16 | 32, value: number }
}

<ReactGbaJs />

<ReactGbaJs /> has the following props:

volume={number} (optional)

Should be a number between 0 (default, muted) or 1 (max volume).

onFpsReported={((fps: number) => void)} (optional)

Callback called every time that an FPS is reported.

scale={number} (optional)

Set the emulator scale. Default value is 1, which has width 240px and height 160px.

onLogReceived={(level: 'error' | 'warn' | 'stub' | 'info', message: string) => void} (optional)

Callback called every time that a log is received within the levels set as true by the prop watchLogLevels.

watchLogLevels={{ error?: boolean, warn?: boolean, stub?: boolean, info?: boolean }} (optional)

Set when the callback onLogReceived should be called. By default the value is { error: true }.

Contribution

1 - Clone this repository

> git clone [e-mail]:macabeus/react-gbajs.git
> cd react-gbajs

2 - Install its dependencies

> npm i

3 - Build and watch the project

> npm run start

4 - In another terminal window, go to the /sample project, install its dependencies, and then build and watch it

> cd sample
> npm i
> npm run start

Finished! Now you can develop the package and test it in real-time 🎉

Thanks

@endrift for GBA.js.
@felix.rodent for the logo.