dispose method

@override void dispose()

Releases backend resources.

Implementation

@override
void dispose() {
  try {
    _lastFrame?.dispose();
    _lastFrame = null;
    _source.dispose();
  } finally {
    // The sorter owns an isolate; release it even if texture cleanup throws.
    _depthSorter.dispose();
    _backgroundTexture = null;
    _resolvedColorTexture = null;
  }
}