isKtx2File function
True when bytes begins with the KTX2 identifier.
Cheap enough to call before committing to a decoder — the same role
isF3dFile plays for .f3d.
Implementation
bool isKtx2File(Uint8List bytes) {
if (bytes.lengthInBytes < kKtx2Identifier.length) return false;
for (var i = 0; i < kKtx2Identifier.length; i++) {
if (bytes[i] != kKtx2Identifier[i]) return false;
}
return true;
}