decodeWebGlSection function

WebGlSectionSources decodeWebGlSection(ByteData bytes)

The sources in bytes.

Throws BundleSectionFormatException when the bytes are not the document above — the device turns that into a refusal naming the bundle.

Implementation

WebGlSectionSources decodeWebGlSection(ByteData bytes) {
  final document = decodeSectionJson(bytes);
  if (document is! Map<String, dynamic>) {
    throw const BundleSectionFormatException(
      'the section is not a JSON object',
    );
  }
  Map<String, String> stages(String kind) {
    final entries = document[kind];
    if (entries is! Map<String, dynamic>) {
      throw BundleSectionFormatException('the section has no "$kind" object');
    }
    return <String, String>{
      for (final entry in entries.entries)
        entry.key: switch (entry.value) {
          final String source => source,
          _ => throw BundleSectionFormatException(
            '"${entry.key}" under "$kind" is not a source string',
          ),
        },
    };
  }

  return (vertex: stages('vertex'), fragment: stages('fragment'));
}