Renderer.md

Renderer Runtime

ExoJS uses a drawable-driven rendering model.

Normal User Path

Most app code should stay inside:

• Scene.draw(runtime)
• drawable.render(runtime)
• Application frame lifecycle

Core Contracts

• SceneRenderRuntime: scene-facing runtime used by scenes/drawables
• WebGl2RendererRuntime: WebGL2 runtime contract
• WebGpuRendererRuntime: WebGPU runtime contract
• Renderer: internal renderer interface for built-in paths

Runtime Operations

Common runtime operations:

• runtime.clear(color?)
• runtime.setView(view | null)
• runtime.setRenderTarget(target | null)
• runtime.execute(pass)
• runtime.flush()

Visual Composition Features

Render nodes support:

• filters
• mask
• cacheAsBitmap + invalidateCache()

Runtime composition helpers:

• RenderTargetPass
• CallbackRenderPass

Temporary render textures:

• runtime.acquireRenderTexture(width, height)
• runtime.releaseRenderTexture(texture)

Stats

runtime.stats exposes draw-call/batch/pass counters and frame timing fields.

See Performance for details.

Backend Notes

Backend selection is normally handled by Application (auto mode by default).

Most projects do not need backend-specific runtime code.