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src/engine/pingPong.ts

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// src/engine/pingPong.ts
// Helper that holds two GPU resources and swaps them per frame.

export class PingPong<T> {
  private a: T;
  private b: T;

  constructor(a: T, b: T) {
    this.a = a;
    this.b = b;
  }

  get read(): T {
    return this.a;
  }

  get write(): T {
    return this.b;
  }

  swap(): void {
    const tmp = this.a;
    this.a = this.b;
    this.b = tmp;
  }

  destroy(destroyFn: (resource: T) => void): void {
    destroyFn(this.a);
    destroyFn(this.b);
  }
}