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* useWebGLContextLossHandler - React hook for handling WebGL context loss
*
* This hook sets up event listeners for WebGL context loss and restoration,
* which can occur due to GPU issues, memory pressure, or browser tab switching.
*
* @example
* ```tsx
* const Canvas = () => {
* useWebGLContextLossHandler();
* return <Canvas>...</Canvas>;
* };
* ```
*/
import type React from "react";
import { useCallback, useEffect, useRef, useState } from "react";
/**
* Global WebGL context state tracking
* Helps coordinate context recovery across multiple Canvas components
*/
let globalContextLossCount = 0;
let globalIsContextLost = false;
let lastContextLossTime = 0;
/**
* Minimum delay between context loss events to prevent thrashing
*/
export const MIN_CONTEXT_RECOVERY_DELAY = 100; // ms
/**
* Get global WebGL context state
*/
export const getWebGLContextState = (): {
isLost: boolean;
lossCount: number;
timeSinceLastLoss: number;
} => ({
isLost: globalIsContextLost,
lossCount: globalContextLossCount,
timeSinceLastLoss: Date.now() - lastContextLossTime,
});
export interface WebGLContextLossOptions {
/**
* Callback when context is lost
*/
readonly onContextLost?: () => void;
/**
* Callback when context is restored
*/
readonly onContextRestored?: () => void;
/**
* Whether to attempt automatic restoration (default: true)
*/
readonly autoRestore?: boolean;
/**
* Optional canvas ref to attach to a specific canvas element
* If not provided, will query for the first canvas in the document
*/
readonly canvasRef?: React.RefObject<HTMLCanvasElement>;
/**
* Delay in ms before attempting to query for canvas (default: 50)
* Helps avoid race conditions during screen transitions
*/
readonly mountDelay?: number;
/**
* Maximum attempts to find canvas element (default: 5)
*/
readonly maxRetries?: number;
}
export interface WebGLContextState {
/** Whether context is currently lost */
readonly isContextLost: boolean;
/** Number of times context has been lost */
readonly lossCount: number;
/** Whether the canvas element has been found */
readonly isCanvasMounted: boolean;
}
/**
* Hook to handle WebGL context loss and restoration
* Returns state information about the WebGL context
*/
export const useWebGLContextLossHandler = (
options: WebGLContextLossOptions = {}
): WebGLContextState => {
const {
onContextLost,
onContextRestored,
autoRestore = true,
canvasRef,
mountDelay = 50,
maxRetries = 5,
} = options;
const [contextState, setContextState] = useState<WebGLContextState>({
isContextLost: globalIsContextLost,
lossCount: globalContextLossCount,
isCanvasMounted: false,
});
// Use refs to store the latest callbacks to avoid re-registering event listeners
const onContextLostRef = useRef(onContextLost);
const onContextRestoredRef = useRef(onContextRestored);
const retryCountRef = useRef(0);
const mountedRef = useRef(true);
// Update refs when callbacks change
useEffect(() => {
onContextLostRef.current = onContextLost;
onContextRestoredRef.current = onContextRestored;
});
// Track component mount state
useEffect(() => {
mountedRef.current = true;
return () => {
mountedRef.current = false;
};
}, []);
const handleContextLost = useCallback(
(event: Event) => {
const now = Date.now();
globalIsContextLost = true;
globalContextLossCount++;
lastContextLossTime = now;
console.warn(
`⚠️ WebGL context lost (count: ${globalContextLossCount}, time since mount: ${
now - lastContextLossTime
}ms)`
);
// Prevent default behavior to allow restoration
if (autoRestore) {
event.preventDefault();
}
Eif (mountedRef.current) {
setContextState({
isContextLost: true,
lossCount: globalContextLossCount,
isCanvasMounted: true,
});
}
onContextLostRef.current?.();
},
[autoRestore]
);
const handleContextRestored = useCallback(() => {
globalIsContextLost = false;
console.log("✅ WebGL context restored successfully");
Eif (mountedRef.current) {
setContextState((prev) => ({
...prev,
isContextLost: false,
}));
}
onContextRestoredRef.current?.();
}, []);
useEffect(() => {
let canvas = canvasRef?.current ?? document.querySelector("canvas");
let cleanupFn: (() => void) | undefined;
let retryTimeout: ReturnType<typeof setTimeout> | undefined;
let observer: MutationObserver | undefined;
const attachListeners = (canvasEl: HTMLCanvasElement) => {
canvasEl.addEventListener("webglcontextlost", handleContextLost, false);
canvasEl.addEventListener(
"webglcontextrestored",
handleContextRestored,
false
);
Eif (mountedRef.current) {
setContextState((prev) => ({
...prev,
isCanvasMounted: true,
}));
}
return () => {
canvasEl.removeEventListener("webglcontextlost", handleContextLost);
canvasEl.removeEventListener(
"webglcontextrestored",
handleContextRestored
);
};
};
// Retry finding canvas with delay to handle screen transitions
const tryFindCanvas = () => {
Iif (!mountedRef.current) return;
canvas = canvasRef?.current ?? document.querySelector("canvas");
if (canvas) {
cleanupFn = attachListeners(canvas);
retryCountRef.current = 0;
} else if (retryCountRef.current < maxRetries) {
retryCountRef.current++;
retryTimeout = setTimeout(tryFindCanvas, mountDelay);
} else {
// Fall back to MutationObserver
observer = new MutationObserver(() => {
canvas = document.querySelector("canvas");
if (canvas && mountedRef.current) {
observer?.disconnect();
cleanupFn = attachListeners(canvas);
}
});
observer.observe(document.body, {
childList: true,
subtree: true,
});
}
};
// Start with initial delay to let Canvas mount
retryTimeout = setTimeout(tryFindCanvas, mountDelay);
// Cleanup
return () => {
Eif (retryTimeout) clearTimeout(retryTimeout);
observer?.disconnect();
cleanupFn?.();
};
}, [
autoRestore,
canvasRef,
handleContextLost,
handleContextRestored,
maxRetries,
mountDelay,
]);
return contextState;
};
/**
* Check if WebGL is available in the current browser
*/
export const isWebGLAvailable = (): boolean => {
try {
const canvas = document.createElement("canvas");
const gl =
canvas.getContext("webgl") ?? canvas.getContext("experimental-webgl");
const available = gl !== null;
// Help GC by cleaning up WebGL context
Iif (gl && "getExtension" in gl) {
const loseContext = gl.getExtension("WEBGL_lose_context");
loseContext?.loseContext();
}
return available;
} catch {
return false;
}
};
/**
* Check if WebGL2 is available in the current browser
*/
export const isWebGL2Available = (): boolean => {
try {
const canvas = document.createElement("canvas");
const gl = canvas.getContext("webgl2");
const available = gl !== null;
// Help GC by cleaning up WebGL context
Iif (gl && "getExtension" in gl) {
const loseContext = gl.getExtension("WEBGL_lose_context");
loseContext?.loseContext();
}
return available;
} catch {
return false;
}
};
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