Canvas.drawVertices — Incredibly fast, incredibly low-level, incredibly fun

Filip Hracek explains how to use Flutter's low-level drawVertices API to build high-performance custom 2D and 3D renderers.

One of Flutter's lowest-level APIs is the drawVertices method, which allows you to efficiently draw an astounding amount of *stuff* on the screen. That stuff can be lines, rectangles, polygons, particles, and whatever else you can think of. This method is how people (including Filip) can even implement specialized 3D renderers on top of Dart that run fast on mobile, web and desktop. In this talk, Filip will explain the API of Canvas.drawVertices() and the Vertices.raw() constructor — both are obscure, very low-level, and hard to explain in documentation alone. But they are worth it when you need to squeeze the last bit of performance out of Flutter. We'll also cover Canvas.drawLines, for good measure. This talk is part of Flutter Forward, a 2023 official Flutter conference in Nairobi, Kenya.