EnTTx v1.2.0

Changelog

• stable_id

  • Added include/enttx/stable_id.hpp with a strongly-typed stable ID wrapper (null-value handling, equality/comparison, std::hash support).
  • Added a monotonic ID generator for sequential, collision-free IDs.
  • Added a fast, zero-dependency, splitmix generator for random identifiers (uint32_t, uint64_t).
  • Added example_stable_id.cpp and test_stable_id.cpp covering generation, hashing, and registry lookup.

• entity_remap

  • basic_entity_remap (and the remap API) reworked to be generic over key/value types instead of being entity-only, so it can remap stable IDs as well as entities.

• hierarchy

  • Tests updated to match the new configuration requirements.

• core

  • Added a shared "pageless component" concept, reused by prefab and observer.

• prefab

  • Prefab nodes now use monotonic stable IDs for identity instead.
  • Entity-based remapping applied on instantiation, using the generalized entity_remap.
  • Tests updated for the new stable-ID-based identity model.

• change_mixin

  • Added include/enttx/change_mixin.hpp, emitting pre-update notifications so observers can capture component state before a change is applied.

• observer

  • Added include/enttx/observer.hpp: records valued and pageless (tag-like) component changes.
  • Collects typed "commits" representing a batch of changes.
  • Supports inverting commits (undo) and re-applying them (redo/replay).
  • Serializes and loads change segments for persistence/network transport.
  • Supports remapping entities within recorded changes (e.g. after prefab instantiation or deserialization).
    *Added test_observer.cpp covering undo/redo, serialization round-trips, and remapping.

Special thanks to Placeblock for design inspiration for the observer system which is based off of entt-net. Website

Full Changelog: v1.1.0...v1.2.0

EnTTx v1.1.0

Changelog

• config

  • Added macro ENTTX_USER_ASSERT to mark specific assertions as user logic errors rather unexpected behaviour.

• hierarchy

  • Added hierarchy_config to customize basic_hierarchy instead of passing each config option as a template param.
  • Added hierarchy_events for signals on relationship operations. Can be disabled via hierarchy_config::enable_events = false.
  • Refactored to be cleaner and simpler to read (Moving iterator definitions out of basic_hierarchy, etc).

• prefab

  • Moved remap_traits to entity_remap.hpp.
  • basic_prefab_registry::create_prefab now accepts a root_hint. Useful for loading a base prefab into the registry.
  • Added rebuild_cache to basic_prefab_registry for loading new prefabs into an existing registry.

• entity_remap

  • Added is_entity_remapper concept as now a remapper is just a functor object with that takes in an entity and returns an entity.
  • remap can now accept any type that satisfies the is_entity_remapper concept.
  • basic_entity_remap now uses entt::dense_map instead of std::unordered_map
  • Added map to basic_entity_remap to easily map an old entity to a new entity.
  • Removed translate and replaced it with entity_type operator()(entity_type old) in basic_entity_remap to satisfy is_entity_remapper .

• tests

  • Updated tests to match the new api's.

Full Changelog: v1.0.0...v1.1.0

EnTTx v1.0.0

EnTTx v1.0.0

First stable release

This release marks the first stable version of EnTTx, a collection of extensions for EnTT that provide higher-level ECS functionality while keeping the same lightweight, data-oriented design philosophy.

Features

Hierarchy System

Added a fast, cache-friendly entity hierarchy system for managing parent/child relationships.

Features include:

• Parent-child relationships
• O(1) hierarchy operations
• Sibling ordering
• Child iteration
• Descendant traversal
• Reparenting support
• Automatic cleanup when entities are destroyed

Prefab System

Added a full prefab authoring and instantiation system built on top of EnTT.

Features include:

• Creating reusable prefab definitions
• Prefab inheritance through IsA relationships
• Component overrides
• Component removal overrides
• Nested prefabs
• Runtime instantiation
• Entity remapping

Compatibility

• Requires EnTT v4.0.0+
• Requires C++20
• Header-only library
• No external dependencies

Breaking Changes

This release establishes the v1.0 API. Future releases will follow semantic versioning:

• Patch releases (1.0.x) will only contain bug fixes
• Minor releases (1.x.0) may add backwards-compatible features
• Major releases (x.0.0) may contain breaking API changes

Getting Started

See the documentation and examples for usage.