Function getRowPadding

webgpu/row_padding.ts:35–51

(width: number)

 * @returns The padded and unpadded values
 */
export function getRowPadding(width: number): Padding {
  // It is a WebGPU requirement that
  // GPUImageCopyBuffer.layout.bytesPerRow % COPY_BYTES_PER_ROW_ALIGNMENT == 0
  // So we calculate paddedBytesPerRow by rounding unpaddedBytesPerRow
  // up to the next multiple of COPY_BYTES_PER_ROW_ALIGNMENT.

  const unpaddedBytesPerRow = width * BYTES_PER_PIXEL;
  const paddedBytesPerRowPadding = (COPY_BYTES_PER_ROW_ALIGNMENT -
    (unpaddedBytesPerRow % COPY_BYTES_PER_ROW_ALIGNMENT)) %
    COPY_BYTES_PER_ROW_ALIGNMENT;
  const paddedBytesPerRow = unpaddedBytesPerRow + paddedBytesPerRowPadding;

  return {
    unpadded: unpaddedBytesPerRow,
    padded: paddedBytesPerRow,
  };
}

/**
 * Creates a new buffer while removing any unnecessary empty bytes.