emilk/egui
Egui
This library is an immediate mode graphical user interface toolkit that reconstructs the entire interface every frame. By executing procedural code within a high-frequency loop that matches the display refresh rate, it allows developers to define interactive elements and state updates directly. The framework utilizes a multi-pass rendering approach to resolve layout dependencies, ensuring that widget sizes and positions are calculated accurately before final placement to prevent visual jitter.
The project functions as a cross-platform graphics toolkit, providing a portable rendering layer that abstracts hardware-accelerated drawing commands across various operating systems and web browsers. It remains backend-agnostic by delegating low-level draw calls to modular integration layers, while its CPU-based tessellation generates geometry for shapes and text before sending them to the graphics hardware. This architecture supports low-latency performance, making it suitable for resource-constrained environments and real-time applications.
Beyond its core rendering capabilities, the framework includes a coordinate-based hit-testing system for input-event dispatching and manages widget interaction priorities for overlapping elements. It provides tools for state-persistence serialization, performance profiling, and multi-viewport management. The system is designed to be configured during the build process, allowing for the inclusion of optional features such as parallel tessellation and interoperability with external math or color libraries.