playcanvas/build/playcanvas.prf/src/core/ref-counted-cache.js

PlayCanvas WebGL game engine

class RefCountedCache {
		destroy() {
				this.cache.forEach((refCount, object)=>{
						object.destroy();
				});
				this.cache.clear();
		}
		incRef(object) {
				const refCount = (this.cache.get(object) || 0) + 1;
				this.cache.set(object, refCount);
		}
		decRef(object) {
				if (object) {
						let refCount = this.cache.get(object);
						if (refCount) {
								refCount--;
								if (refCount === 0) {
										this.cache.delete(object);
										object.destroy();
								} else {
										this.cache.set(object, refCount);
								}
						}
				}
		}
		constructor(){
				this.cache = new Map();
		}
}

export { RefCountedCache };