pixijs-core-concepts

name: pixijs-core-concepts description: "Use this skill when understanding how PixiJS v8 renders frames: the systems-and-pipes renderer, the render loop, and how the library adapts to different environments. Covers WebGLRenderer/WebGPURenderer/CanvasRenderer selection, renderer.render() pipeline, environment detection, and pointers to per-topic deep dives. Triggers on: renderer, WebGL, WebGPU, Canvas, render loop, render pipeline, systems, environments, autoDetectRenderer." license: MIT

Foundational model for how PixiJS v8 gets pixels on the screen: the renderer decides which GPU backend to use, the render loop drives per-frame work, and the environment layer adapts the library to browser, Web Worker, or SSR contexts. For the scene graph itself (Containers, transforms, destroy), see pixijs-scene-core-concepts.

Quick Start

console.log(app.renderer.name); // 'webgl' | 'webgpu' | 'canvas'

app.ticker.add((ticker) => {
  sprite.rotation += 0.01 * ticker.deltaTime;
});

const tex = app.renderer.extract.texture({ target: app.stage });

app.renderer.render({ container: app.stage });

app.renderer is the WebGLRenderer, WebGPURenderer, or CanvasRenderer chosen by autoDetectRenderer. The TickerPlugin drives renderer.render() automatically; call it manually only with autoStart: false. Backend selection happens in Application.init({ preference }); see pixijs-application for setup.

Related skills: pixijs-application (Application construction and lifecycle), pixijs-ticker (per-frame logic, priorities, FPS capping), pixijs-environments (Web Worker, SSR, strict CSP), pixijs-custom-rendering (writing a RenderPipe), pixijs-scene-core-concepts (scene graph basics).

Topics

For deep dives into any single topic, open the corresponding reference file. Non-browser targets (DOMAdapter, WebWorkerAdapter, custom adapters, strict CSP) are covered in the pixijs-environments skill.

Decision guide

• Setting up an Application? Start with pixijs-application. This skill explains what the renderer does under the hood.
• Choosing between WebGL and WebGPU? Use ['webgpu', 'webgl'] as your preference array. WebGPU is fastest where available; WebGL is the reliable fallback. See references/renderers.md.
• Running in a Web Worker? Set DOMAdapter.set(WebWorkerAdapter) before app.init. See the pixijs-environments skill for complete setup.
• Need manual control over when rendering happens? Set autoStart: false and call app.renderer.render(app.stage) from your own loop. See references/render-loop.md.
• Integrating with a physics library? Add your update at UPDATE_PRIORITY.HIGH so physics runs before the render at LOW. See references/render-loop.md.
• Writing a custom renderable? Implement a RenderPipe. See pixijs-custom-rendering skill.
• Running under strict CSP? Import 'pixi.js/unsafe-eval'. See the pixijs-environments skill.

Quick concepts

Renderer = systems + pipes

Each renderer is composed of Systems (lifecycle services: textures, buffers, state, filters, masks) and RenderPipes (per-renderable instruction builders: sprite, graphics, mesh, particle, text, tiling). Writing a custom renderable means implementing a RenderPipe and registering it via extensions.

The render loop

app.ticker.add(fn) registers a callback that runs every frame. The TickerPlugin registers app.render() at UPDATE_PRIORITY.LOW, so ticker callbacks at NORMAL or HIGH run before the draw. Disable the plugin with autoStart: false for manual control.

Environments

DOMAdapter abstracts every DOM call PixiJS makes (canvas creation, image loading, fetch, XML parsing). Swap with DOMAdapter.set(WebWorkerAdapter) for Workers or implement a custom Adapter for Node/SSR. Must be done before Application.init.

Common Mistakes

[HIGH] Accessing app.renderer before init() resolves

Wrong:

const app = new Application();
app.init({ width: 800, height: 600 });
console.log(app.renderer.name); // undefined — init() is async

Correct:

const app = new Application();
await app.init({ width: 800, height: 600 });
console.log(app.renderer.name); // 'webgl' | 'webgpu' | 'canvas'

Application.init() is async. app.renderer, app.canvas, and app.screen do not exist until after the promise resolves.

[HIGH] Setting DOMAdapter after Application.init

Wrong:

const app = new Application();
await app.init({ width: 800, height: 600 });
DOMAdapter.set(WebWorkerAdapter); // too late — init already allocated resources

Correct:

DOMAdapter.set(WebWorkerAdapter);
const app = new Application();
await app.init({ width: 800, height: 600 });

The adapter abstracts DOM calls the renderer makes during construction (canvas creation, image loading, fetch). Swap it before init() or the wrong adapter is baked into the renderer.

[MEDIUM] Treating preference as a guarantee

Wrong:

await app.init({ preference: "webgpu" });
// assume WebGPU is active
useWebGPUOnlyFeature(app.renderer);

Correct:

await app.init({ preference: "webgpu" });
if (app.renderer.name === "webgpu") {
  useWebGPUOnlyFeature(app.renderer);
}

preference is a hint, not a demand. If the browser lacks WebGPU support, PixiJS falls back to WebGL (or Canvas). Always branch on renderer.name for backend-specific code.

API Reference

• autoDetectRenderer
• AbstractRenderer
• WebGLRenderer
• WebGPURenderer
• CanvasRenderer
• Application
• DOMAdapter