Method getOrCreateReadStagingBuffer

web/src/webgpu.ts:970–981

* Get a MAP_READ staging buffer from the pool, or create one if none fits. * Uses first-fit-by-size: returns the first pooled buffer >= nbytes.

(nbytes: number)

   * Uses first-fit-by-size: returns the first pooled buffer >= nbytes.
   */
  private getOrCreateReadStagingBuffer(nbytes: number): GPUBuffer {
    for (let i = 0; i < this.readStagingBufferPool.length; i++) {
      if (this.readStagingBufferPool[i].size >= nbytes) {
        const entry = this.readStagingBufferPool.splice(i, 1)[0];
        return entry.buffer;
      }
    }
    return tryCreateBuffer(this.device, {
      size: nbytes,
      usage: GPUBufferUsage.MAP_READ | GPUBufferUsage.COPY_DST,
    });
  }

  /**
   * Return a MAP_READ staging buffer to the pool for reuse.