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May 16, 2022 17:27
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v7 React Native Canvas
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/** | |
* react-native example using R3F v7. | |
* | |
* Dependencies: | |
* - @react-three/fiber 7.0.29 | |
* - react 17.0.1 | |
* - react-native 0.68.2 | |
* - expo-gl 11.3.0 | |
*/ | |
import * as React from 'react' | |
import { render, unmountComponentAtNode } from '@react-three/fiber' | |
import { PixelRatio, View, StyleSheet } from 'react-native' | |
import { GLView } from 'expo-gl' | |
function Block({ set }) { | |
React.useLayoutEffect(() => { | |
set(new Promise(() => null)) | |
return () => set(false) | |
}, [set]) | |
return null | |
} | |
class ErrorBoundary extends React.Component { | |
state = { error: false } | |
static getDerivedStateFromError = () => ({ error: true }) | |
componentDidCatch(error) { | |
this.props.set(error) | |
} | |
render() { | |
return this.state.error ? null : this.props.children | |
} | |
} | |
const Canvas = React.forwardRef(function Canvas({ style, children, ...props }, forwardedRef) { | |
const viewRef = React.useRef() | |
const [size, setSize] = React.useState({ width: 0, height: 0 }) | |
const [canvas, setCanvas] = React.useState(null) | |
React.useImperativeHandle(forwardedRef, () => viewRef.current) | |
const [block, setBlock] = React.useState(false) | |
const [error, setError] = React.useState(false) | |
// Suspend this component if block is a promise (2nd run) | |
if (block) throw block | |
// Throw exception outwards if anything within canvas throws | |
if (error) throw error | |
const onLayout = React.useCallback((e) => { | |
const { width, height } = e.nativeEvent.layout | |
setSize({ width, height }) | |
}, []) | |
const onContextCreate = React.useCallback((context) => { | |
const canvasShim = { | |
width: context.drawingBufferWidth, | |
height: context.drawingBufferHeight, | |
style: {}, | |
addEventListener: () => {}, | |
removeEventListener: () => {}, | |
clientHeight: context.drawingBufferHeight, | |
getContext: () => context, | |
} | |
setCanvas(canvasShim) | |
}, []) | |
if (size.width > 0 && size.height > 0 && canvas) { | |
render( | |
<ErrorBoundary set={setError}> | |
<React.Suspense fallback={<Block set={setBlock} />}>{children}</React.Suspense> | |
</ErrorBoundary>, | |
canvas, | |
{ | |
...props, | |
size, | |
dpr: PixelRatio.get(), | |
onCreated(state) { | |
// Swap buffers on render | |
const context = state.gl.getContext() | |
const renderFrame = state.gl.render.bind(state.gl) | |
state.gl.render = (scene, camera) => { | |
renderFrame(scene, camera) | |
context.endFrameEXP() | |
} | |
return props?.onCreated?.(state) | |
}, | |
}, | |
) | |
} | |
React.useEffect(() => { | |
if (canvas) { | |
return () => unmountComponentAtNode(canvas) | |
} | |
}, [canvas]) | |
return ( | |
<View ref={viewRef} onLayout={onLayout} style={{ flex: 1, ...style }}> | |
{size.width > 0 && size.height > 0 && ( | |
<GLView onContextCreate={onContextCreate} style={StyleSheet.absoluteFill} /> | |
)} | |
</View> | |
) | |
}) | |
export default function App() { | |
return ( | |
<Canvas camera={{ position: [0, 1.3, 3] }}> | |
<gridHelper args={[1, 1]} /> | |
</Canvas> | |
) | |
} |
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