In short, don’t wait for a Rive integration in GDevelop 5 this year (2026).
I personally have a version of the engine that supports Rive files, but it is far from stable and this isn’t official at all.
Before I open a PR for it, GDevelop engine’s 2D editor will need to be reworked as shown on the official GDevelop roadmap.
I really need the upcoming realtime 2D editor because Rive files cannot currently be loaded and displayed in the editor, they are only visible at runtime.
Additionally, the runtime needs some optimization because it has to convert the SVG from the Rive file into textures used in Pixi.js, which is the 2D rendering engine used by GDevelop.
