Method deviceCopyToGPU

web/src/webgpu.ts:938–964

(
    from: Pointer,
    to: GPUPointer,
    toOffset: number,
    nbytes: number
  )

  }

  private deviceCopyToGPU(
    from: Pointer,
    to: GPUPointer,
    toOffset: number,
    nbytes: number
  ): void {
    // Flush batched compute passes before writing to a GPU buffer,
    // otherwise the write may be reordered before pending dispatches
    // that read from the same buffer.
    this.flushCommands();
    let rawBytes = this.memory.loadRawBytes(from, nbytes);
    if (rawBytes.length % 4 !== 0) {
      // writeBuffer requires length to be multiples of 4, so we pad here
      const toPad = 4 - rawBytes.length % 4;
      const padded = new Uint8Array(rawBytes.length + toPad);
      padded.set(rawBytes);
      rawBytes = padded;
      nbytes = nbytes + toPad;
    }
    this.device.queue.writeBuffer(
      this.gpuBufferFromPtr(to),
      toOffset,
      rawBytes as GPUAllowSharedBufferSource,
      0,
      nbytes
    );
  }

  /**
   * Get a MAP_READ staging buffer from the pool, or create one if none fits.