method getWebglIndex

Source

static int getWebglIndex(int bitmapDataChannel) {
  if (bitmapDataChannel & BitmapDataChannel.RED != 0) return 0;
  if (bitmapDataChannel & BitmapDataChannel.GREEN != 0) return 1;
  if (bitmapDataChannel & BitmapDataChannel.BLUE != 0) return 2;
  if (bitmapDataChannel & BitmapDataChannel.ALPHA != 0) return 3;
  throw new ArgumentError("Invalid bitmapDataChannel");
}