@motion-core/motion-gpu/dist/svelte/use-texture.js

Framework-agnostic WebGPU runtime for fullscreen WGSL shaders with explicit Svelte, React, and Vue adapter entrypoints.

import { toMotionGPUErrorReport } from "../core/error-report.js";
import { createCurrentWritable } from "../core/current-value.js";
import { isAbortError, loadTexturesFromUrls } from "../core/texture-loader.js";
import { onDestroy, onMount } from "svelte";
//#region src/lib/svelte/use-texture.ts
/**
* Normalizes unknown thrown values to an `Error` instance.
*/
function toError(error) {
	if (error instanceof Error) return error;
	return /* @__PURE__ */ new Error("Unknown texture loading error");
}
/**
* Releases GPU-side resources for a list of loaded textures.
*/
function disposeTextures(list) {
	for (const texture of list ?? []) texture.dispose();
}
function mergeAbortSignals(primary, secondary) {
	if (!secondary) return {
		signal: primary,
		dispose: () => {}
	};
	if (typeof AbortSignal.any === "function") return {
		signal: AbortSignal.any([primary, secondary]),
		dispose: () => {}
	};
	const fallback = new AbortController();
	let disposed = false;
	const cleanup = () => {
		if (disposed) return;
		disposed = true;
		primary.removeEventListener("abort", abort);
		secondary.removeEventListener("abort", abort);
	};
	const abort = () => fallback.abort();
	primary.addEventListener("abort", abort, { once: true });
	secondary.addEventListener("abort", abort, { once: true });
	return {
		signal: fallback.signal,
		dispose: cleanup
	};
}
/**
* Loads textures from URLs and exposes reactive loading/error state.
*
* @param urlInput - URLs array or lazy URL provider.
* @param optionsInput - Loader options object or lazy options provider.
* @returns Reactive texture loading state with reload support.
*/
function useTexture(urlInput, optionsInput = {}) {
	const textures = createCurrentWritable(null);
	const loading = createCurrentWritable(true);
	const error = createCurrentWritable(null);
	const errorReport = createCurrentWritable(null);
	let disposed = false;
	let requestVersion = 0;
	let activeController = null;
	let runningLoad = null;
	let reloadQueued = false;
	const getUrls = typeof urlInput === "function" ? urlInput : () => urlInput;
	const getOptions = typeof optionsInput === "function" ? optionsInput : () => optionsInput;
	const executeLoad = async () => {
		if (disposed) return;
		const version = ++requestVersion;
		const controller = new AbortController();
		activeController = controller;
		loading.set(true);
		error.set(null);
		errorReport.set(null);
		const previous = textures.current;
		const options = getOptions() ?? {};
		const mergedSignal = mergeAbortSignals(controller.signal, options.signal);
		try {
			const loaded = await loadTexturesFromUrls(getUrls(), {
				...options,
				signal: mergedSignal.signal
			});
			if (disposed || version !== requestVersion) {
				disposeTextures(loaded);
				return;
			}
			textures.set(loaded);
			disposeTextures(previous);
		} catch (nextError) {
			if (disposed || version !== requestVersion) return;
			if (isAbortError(nextError)) return;
			disposeTextures(previous);
			textures.set(null);
			const normalizedError = toError(nextError);
			error.set(normalizedError);
			errorReport.set(toMotionGPUErrorReport(normalizedError, "initialization"));
		} finally {
			if (!disposed && version === requestVersion) loading.set(false);
			if (activeController === controller) activeController = null;
			mergedSignal.dispose();
		}
	};
	const runLoadLoop = async () => {
		do {
			reloadQueued = false;
			await executeLoad();
		} while (reloadQueued && !disposed);
	};
	const load = () => {
		activeController?.abort();
		if (runningLoad) {
			reloadQueued = true;
			return runningLoad;
		}
		const trackedPending = runLoadLoop().finally(() => {
			if (runningLoad === trackedPending) runningLoad = null;
		});
		runningLoad = trackedPending;
		return trackedPending;
	};
	onMount(() => {
		load();
	});
	onDestroy(() => {
		disposed = true;
		requestVersion += 1;
		activeController?.abort();
		disposeTextures(textures.current);
	});
	return {
		textures,
		loading,
		error,
		errorReport,
		reload: load
	};
}
//#endregion
export { useTexture };

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