Retained Mode Rendering
Retained mode rendering is a graphics programming paradigm where an application maintains a persistent model or scene graph of graphical objects, and a rendering system automatically handles updates and redraws when changes occur. It contrasts with immediate mode rendering, where the application must explicitly redraw the entire scene each frame. This approach is commonly used in GUI frameworks, game engines, and vector graphics libraries to simplify rendering logic and improve performance through incremental updates.
Developers should learn retained mode rendering when building applications with complex, dynamic user interfaces, interactive graphics, or games where scene management and efficient updates are critical. It is particularly useful in scenarios like desktop applications with widgets, web-based UI frameworks, or 2D/3D engines that require object persistence and automatic rendering optimizations, as it reduces boilerplate code and enables features like event handling and animation.