UltraRender

High-performance Lottie renderer written in Rust and powered by WebGPU.

UltraRender is designed for rendering many animated Lottie/JSON objects efficiently on a single GPU canvas, with a lightweight architecture focused on games, interactive interfaces and real-time applications.

Goals

• Rust + WebGPU
• Lottie / JSON animation support
• Single canvas for multiple sprites
• GPU draw batching
• GPU-friendly tessellation
• Scene tree
• Visual effects
• State machines
• Native + WebAssembly targets
• High sprite count
• 100+ FPS target

Architecture

UltraRender takes inspiration from two mature rendering architectures:

skia Runtime

• GPU rendering pipeline
• Draw batching
• Tessellation
• Efficient animation runtime

ThorVG

• Lottie parsing
• Scene tree
• Shapes and paths
• Masks and clipping
• Visual effects

Lottie JSON
    │
    ▼
  Parser
    │
    ▼
Scene Tree
    │
    ▼
Animation Runtime
    │
    ▼
Tessellation
    │
    ▼
Draw Batcher
    │
    ▼
WebGPU Renderer
    │
    ▼
   Canvas

Example

let mut renderer = UltraRenderer::new(&device, &queue);

let animation = renderer.load("character.json")?;

let sprite = renderer.spawn(animation);

sprite.set_position(320.0, 180.0);
sprite.play("idle");

renderer.render();

State Machine

sprite.set_bool("running", true);
sprite.set_number("speed", 2.0);
sprite.fire("attack");

State machines are evaluated by the runtime while rendering remains fully GPU-oriented.

Performance

UltraRender is designed around a shared rendering context instead of creating an isolated renderer for every animation.

1 WebGPU Device
1 Canvas
1 Render Pipeline

        │
        ├── Sprite
        ├── Sprite
        ├── Sprite
        ├── Sprite
        └── ...

Animations are grouped and submitted through batched GPU draw calls whenever possible.

The target is smooth rendering of large numbers of animated objects at 100+ FPS, depending on animation complexity and hardware.

Targets

Native
├── Windows
├── Linux
└── macOS

Web
└── WebAssembly + WebGPU

Status

🚧 Experimental

UltraRender is currently under active development.

Planned areas include:

• Lottie parser
• Shapes and paths
• Gradients
• Masks
• Clipping
• Trim paths
• Blend modes
• Text
• Images
• Effects
• Draw batching
• State machines
• WASM bindings

License

TBD