message: gltfpack: Prohibit the use of -cf together with -cc or -vpf
  cf requires that we never use filters during encoding, since the
  fallback buffer needs to contain raw data. We activate filters when
  using -cc and -vpf, so these need to be mutually exclusive.
diff: @@ -1492,6 +1492,18 @@ int main(int argc, char** argv)
  return 1;
  }
  + if (settings.fallback && settings.compressmore)
  + {
  + fprintf(stderr, "Option -cf can not be used together with -cc\n");
  + return 1;
  + }
  +
  + if (settings.fallback && settings.pos_float)
  + {
  + fprintf(stderr, "Option -cf can not be used together with -vpf\n");
  + return 1;
  + }
  +
  return gltfpack(input, output, report, settings);
  }
  