$ show neilmewada/CrystalEngine
CrystalEngine is a full-featured, cross-platform game engine with an integrated editor, built from scratch in C++. It features a custom Vulkan/Metal rendering backend with a directed acyclic frame graph for render pass scheduling, a physically-based rendering pipeline with IBL and shadow mapping, and a modular architecture with dynamic module loading. The engine includes a comprehensive asset pipeline (import, compression, serialization), a job system for parallelism, and a physics integration via Jolt. A notable aspect is the dual UI framework: the older CrystalWidgets (CSS-styled) and the newer Fusion framework (declarative, property-based), both used in the editor. The editor provides dockable windows, property editors, material editing, scene outliner, and asset browser. The codebase demonstrates strong engineering with clean abstractions (RHI, RPI, frame graph, job system) but shows signs of ongoing migration (two UI frameworks) and some incomplete features. It is actively maintained and suitable for learning or extending a modern game engine architecture.
The LLM identified 3 files worth highlighting for reuse:
A work-stealing job manager with per-thread queues and a global queue, supporting job dependencies, completion events, and thread tagging. It is a self-contained, reusable parallel execution engine that can be extracted for any C++ project needing a lightweight task system.
Implements a binary tree-based rectangle packing algorithm (FImageAtlas::BinaryNode) for texture atlases. Supports insert, remove, and defragmentation operations. This is a standalone, well-tested data structure that can be reused for any 2D bin packing problem (e.g., sprite sheets, font atlases).
A type-safe, multi-cast delegate system supporting member functions, lambdas, and free functions. It provides compile-time type checking and is decoupled from the engine's RTTI. This pattern is directly reusable as a generic callback mechanism in any C++ project.