message: gltfpack: Switch to compression level 1 for ETC1S
  toktx doesn't work with --clevel 0; it looks like on some textures
  clevel 0 actually results in noticeably larger sizes, so we're going
  to default to 1 for now.
diff: @@ -24,8 +24,8 @@ static const char* kMimeTypes[][2] = {
  };
  static const BasisSettings kBasisSettings[10] = {
  - {0, 1, 0, 1.5f},
  - {0, 6, 0, 1.f},
  + {1, 1, 0, 1.5f},
  + {1, 6, 0, 1.f},
  {1, 20, 1, 1.0f},
  {1, 50, 1, 0.75f},
  {1, 90, 1, 0.5f},
  