Function contentHashKey

pj_scene3D/widgets/src/mesh_loader.cpp:56–65

FNV-1a over a byte span — a cheap, stable content hash for embedded-texture cache keys (dedups identical embedded images and survives GL-context recreation).

// FNV-1a over a byte span — a cheap, stable content hash for embedded-texture
// cache keys (dedups identical embedded images and survives GL-context recreation).
std::string contentHashKey(const std::uint8_t* data, std::size_t size) {
  std::uint64_t h = 1469598103934665603ULL;  // FNV offset basis
  for (std::size_t i = 0; i < size; ++i) {
    h ^= data[i];
    h *= 1099511628211ULL;  // FNV prime
  }
  std::array<char, 17> buf{};
  std::snprintf(buf.data(), buf.size(), "%016llx", static_cast<unsigned long long>(h));
  return std::string("emb:") + buf.data();
}

// Resolve one texture map of a material into a TextureSource. Embedded glTF/GLB
// images (assimp ref "*N") become inline bytes keyed by content hash; external