@motion-core/motion-gpu/dist/core/compute-bindgroup-cache.js

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

//#region src/lib/core/compute-bindgroup-cache.ts
function equalResourceRefs(previous, previousCount, next) {
	if (previousCount !== next.length) return false;
	for (let index = 0; index < previousCount; index += 1) if (!Object.is(previous[index], next[index])) return false;
	return true;
}
function nullBackingSlots(array, from, to) {
	for (let index = from; index < to; index += 1) array[index] = null;
}
function createComputeStorageBindGroupCache(device) {
	let cachedTopologyKey = null;
	let cachedLayout = null;
	let cachedBindGroup = null;
	let cachedResourceRefs = [];
	let cachedResourceRefCount = 0;
	const reset = () => {
		cachedTopologyKey = null;
		cachedLayout = null;
		cachedBindGroup = null;
		nullBackingSlots(cachedResourceRefs, 0, cachedResourceRefCount);
		cachedResourceRefCount = 0;
	};
	return {
		getOrCreate(request) {
			if (request.layoutEntries.length === 0) {
				reset();
				return null;
			}
			if (cachedTopologyKey !== request.topologyKey) {
				cachedTopologyKey = request.topologyKey;
				cachedLayout = device.createBindGroupLayout({ entries: request.layoutEntries });
				cachedBindGroup = null;
				nullBackingSlots(cachedResourceRefs, 0, cachedResourceRefCount);
				cachedResourceRefCount = 0;
			}
			if (!cachedLayout) throw new Error("Compute storage bind group cache is missing a layout.");
			if (cachedBindGroup && equalResourceRefs(cachedResourceRefs, cachedResourceRefCount, request.resourceRefs)) return cachedBindGroup;
			cachedBindGroup = device.createBindGroup({
				layout: cachedLayout,
				entries: request.bindGroupEntries
			});
			const prevCount = cachedResourceRefCount;
			cachedResourceRefCount = request.resourceRefs.length;
			if (cachedResourceRefs.length < cachedResourceRefCount) cachedResourceRefs = new Array(cachedResourceRefCount);
			for (let index = 0; index < cachedResourceRefCount; index += 1) cachedResourceRefs[index] = request.resourceRefs[index];
			nullBackingSlots(cachedResourceRefs, cachedResourceRefCount, prevCount);
			return cachedBindGroup;
		},
		reset,
		_refAt(index) {
			return cachedResourceRefs[index];
		}
	};
}
//#endregion
export { createComputeStorageBindGroupCache };

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