Class Batcher

Backend-neutral base class for renderer batchers.

A batcher accumulates vertices into a CPU staging buffer and turns them into GPU work in batches — one draw call for many shapes/sprites. This class defines the lifecycle contract shared by every backend:

• init(renderer, settings) — build (or rebuild after a context/device loss) the batcher's GPU-facing state; called by the constructor
• bind() / unbind() — the renderer switches the active batcher
• flush() — turn the pending vertices into GPU work
• reset() — drop transient state (game reset / context restore)
• destroy() — release every GPU resource the batcher owns

Custom batchers extend the class matching the renderer they target — WebGLBatcher for the WebGL renderer, WebGPUBatcher for the WebGPU renderer — and are registered through renderer.addBatcher(), which accepts any Batcher subclass.